Rolls-Royce Archives
| Identifier | Entry | ||
| Scan001 | Overheating and water boiling trouble on a 40/50 HP car in Australia. | ||
| View original record | X766 BY. Hs. C. Wor EP4/H9.2.25. re. Overheating - Water Boiling Trouble. We have to confirm conversation with Mr. Clough on Saturday morning to the effect that we had received a cable from Pt.… | ||
| Scan002 | Cause of overheating and water boiling trouble, suggesting high atmospheric temperature in Australia. | ||
| View original record | To EP. from Hs. c. to EY. c. to Wor. X766 Hs1/LG10.2.25. RE. OVERHEATING AND WATER BOILING TROUBLE. With reference to EP4/H9.2.25. Our results do not confirm that there is any increase in the amount… | ||
| Scan003 | Overheating issues in Australia, testing a single branch exhaust manifold against a two-branch system on a 40/50 engine. | ||
| View original record | S.R. 493a (50m) (D.B. 173 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 4766 REF: Hs/Rm/LG9.4.25. To BY. from Hs/Rm. c. to EP. c. to Sg. c. to BJ. OVERHEATING TROUBLES IN AUSTRALIA. X.766 X.3426… | ||
| Scan004 | Investigating a potential overheating issue in a 40/50 HP car, likely caused by a faulty exhaust butterfly baffle. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Sm/103.4.25. We are certain that had there been any difference which could have been noticed by a customer that we… | ||
| Scan005 | Overheating issues of the 40/50 model at various speeds and ventilation configurations. | ||
| View original record | R.R. 493A (50M) (D.B. 175 23-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/Rnl/LC9.4.25. (a) If a 40/50 fitted with a 2 1/4" matrix and no ventilation, is driven at full throttle, it will… | ||
| Scan006 | Chassis improvements covering engine firing, overheating, front spring stiffness, and steering. | ||
| View original record | To E. & DA. from R. To AJS. c. to HS. BY. Y766 RG/M15.4.25. FUTURE CAR WORK. 766 X.8770 S430 X.5770 S230 X.8410 Please contradict if incorrect. When you get time please make studies for chassis… | ||
| Scan007 | Short memo forwarding a copy of another document from B.J. | ||
| View original record | S/R. WOR. c. to DY. c. to Hs. S/W Hs 4766 Hr2/E/20.4.25. Herewith is copy of Hr1/TB/18.4.25, which BJ. has asked me to send to you. Hr. [Watermark: DICKINSON BOND] | ||
| Scan008 | Overheating issues with chassis No. 47-AU following the fitting of a new type of exhaust. | ||
| View original record | (COPY) Hr1/TB/18.4.25. To Sg. from Hr. Re:- Chassis No. 47-AU - and other Overheating troubles. I have read these letters through and they have interested me, especially as the day before yesterday… | ||
| Scan009 | Suggestion for a comparative test to diagnose overheating issues on Mr. Gliksten's car by using the exhaust cutout. | ||
| View original record | To CWB. from Hs. c. to BJ. Wor. BY. X766 Hsl/LG21.4.25. OVERHEATING TROUBLES. X4118 / X766 We suggest that if you have an opportunity when you are testing Mr. Gliksten's car, you make a comparative… | ||
| Scan010 | Proposing a round-table discussion in Derby regarding overheating issues. | ||
| View original record | S/W (Hs) copy to H. CWB. x766 PN6/LH23.4.25. OVERHEATING. There are many considerations arising out of this subject with all types, which we are very anxious to discuss with you soon - especially… | ||
| Scan011 | From CJ regarding the incorrect procedure followed for an overheating issue, clarifying departmental responsibilities and process. | ||
| View original record | To BJ from CJ. Copy to PN. Copy to Hs. Copy to Wor. Copy to DY. re Overheating. On re-consideration it appears to me that the procedure has been wrong. Firstly, the Sales Conference is advisory and… | ||
| Scan012 | Overheating issue in Australia, suspecting it's caused by a choked exhaust throttle and proposing a test and cable message. | ||
| View original record | X766 DJ. JH. -- BY3/H. 23.4.25. -- OVERHEATING - AUSTRALIA. ----------------------- Referring to Hs' recent report on the above subject, in talking the matter over again with him, he feels certain… | ||
| Scan013 | The causes of over-heating in 40/50 HP cars with four-wheel brakes. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. X766 REF HS6/LG27.4.25. To R. from Hs. c. to CJ. BJ. c. to E. RG. c. to DA. BY. c. to WOr. OVER-HEATING ON 40/50 HP. CARS.… | ||
| Scan014 | Modifying the choke valve controls to prevent overheating in six-cylinder engines. | ||
| View original record | H.R. 499A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HS6/LG27.4.25. Therefore with the cars in which the choke valve is in the exhaust pipe for all six cylinders, the driver… | ||
| Scan015 | From CJ clarifying a previous communication regarding a Sales Conference and the topic of overheating. | ||
| View original record | X766 Hs To PN from CJ. To Hs. from CJ. To Wor. from CJ. To By. from CJ. Overheating. CJ2/E27/4/25 Referring to my memorandum CJ6/E24/4/25, re overheating, I did not make it clear that BJ was not… | ||
| Scan016 | Overheating issues with the 40/50s models, focusing on the problems with exhaust heated throttles. | ||
| View original record | To CJ. from R. c. to Hs. EY. E. X766 RE. OVERHEATING OF 40/50s. CJ1/E37.4.25. R5/M28.4.25. X.766 X.3536 X.8230 I have just heard of the Australian trouble. My impression is that the choke valve in the… | ||
| Scan017 | Suggestion to wire Australia with instructions to modify and retest a throttle system. | ||
| View original record | -2- I suggest wiring Australia with Derby's approval as to possibilities of doing so, etc. as follows :- "CANCEL VALVE IN EXHAUST AND REVERT TO WATER HEATED THROTTLE RETEST AND REPORT". R. | ||
| Scan018 | Replying to a memo about overheating on 40/50 cars, specifically concerning the fitting of 4-wheel brakes. | ||
| View original record | H.H. 499a (50m) (D.B. 175 25-9-24) J.H.D. X766 EXPERIMENTAL REPORT. Expl. No. REF. Hs5/LG28.4.25. To R. from Hs. To CJ. " " To BJ. " " To Wor. " " RE. OVERHEATING ON 40/50 CARS. 46990 X766 Referring… | ||
| Scan019 | Vehicle braking, overheating issues, and performance in hot climates. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: HS5/LG28.4.25. same speed, on a car with rear brakes only, the power will be shut off at a greater distance from the… | ||
| Scan020 | Car boiling issues, comparing models with and without 4-wheel brakes during tests in France and addressing complaints from Australia. | ||
| View original record | R.R. 499a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs5/LG28.4.25. When running tests in France last year, the 40/50 HP. cars were in continual trouble with boiling. With… | ||
| Scan021 | Cover memo for an attached report regarding overheating on 40/50 cars. | ||
| View original record | X766 To R. from Hs. c. to E. c. to DA. Hs7/LG28.4.25. OVERHEATING ON 40/50 CARS. We attach copy of report mentioned in 48990 X766 CJ1/E27.4.25. Hs. | ||
| Scan022 | Overheating issues in Australia, testing a single branch exhaust system against a two-branch system on a 40/50 engine. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm/LG9.4.25. To HY. from Hs/Rm. c. to EP. c. to Sg. c. to BJ. C O P Y. OVERHEATING TROUBLES IN AUSTRALIA. Bench tests… | ||
| Scan023 | Investigating a potential overheating issue in a car, possibly due to a stuck exhaust butterfly baffle. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Rnl/LG.4.25. We are certain that had there been any difference which could have been noticed by a customer that we… | ||
| Scan024 | The overheating conditions of a 40/50 model vehicle. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF Hs/Rml/L39.4.25. (a) If a 40/50 fitted with a 2 1/2" matrix and no ventilation is driven at full throttle, it will boil… | ||
| Scan025 | Recommendation to prevent water boiling in 40/50 and EAC models by modifying the cooling system for hot climates. | ||
| View original record | X766 Extract from R1/M29.4.25. X.8770 X.2565 WATER BOILING 40/50 X.766 X.8230 For the hot climates, and preferably generally, I am recommending that we cancel the valve in the exhaust pipe, using an… | ||
| Scan026 | The advantages and disadvantages of reverting to a water-heated throttle. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. 4766 EXPERIMENTAL REPORT. Expl. No. REF: HS2/LG1.5.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. RE. CARBURETTER HEATING. 4766 X8080… | ||
| Scan027 | Findings on the exhaust heated throttle and choke valve. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs2/LG1.5.25 In order to assist you in your decisions, we should like to put forward the following facts :- (a) The… | ||
| Scan028 | Power reduction from a choke valve and a seasonal overheating issue in Australia. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF:Hs2/LG1.5.25. various speeds, the maximum reduction in power which can be measured due to the choke valve being… | ||
| Scan029 | Investigating over-heating, specifically testing if the choke valve in the exhaust is the cause. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H. D. EXPERIMENTAL REPORT. X766 COPIES TO: R.CJ. BJ. WOR. By. E. Da. EP. PN. OY. Expl. No. 766 8230 REF. HS8/LG1. 5. 25. OBJECT OF TEST. OVER-HEATING INVESTIGATIONS.… | ||
| Scan030 | Tests of heat flow to the cooling water with exhaust back pressure on an 'EAC' engine. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF. Hs/ACL/LG29.4.25. TESTS ON HEAT FLOW TO THE COOLING WATER WITH EXHAUST BACK PRESSURE TAKEN ON 'EAC' ENGINE. The following… | ||
| Scan031 | Results from three engine performance tests (A, B, C) and their corresponding curves. | ||
| View original record | R.R. 493a (50m) (D.B. 173 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/ACL/LG29.4.25. TEST (A) CURVE 2. As would be expected we get a steady fall in the heat dissipated as the power on… | ||
| Scan032 | The effects of exhaust back pressure on engine power and heat flow. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: HS/ACL/LG29.4.25. to open up the throttle and the heat flow increases although the power at the flywheel is the same.… | ||
| Scan033 | The effect of an exhaust down-pipe baffle on car overheating. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF. Hs/Rm/LG30.4.25. EXHAUST DOWN-PIPE BAFFLE. We have carried out a number of experiments on the car, both on the dynamometer… | ||
| Scan034 | The effects of a restricted exhaust baffle on engine performance and cooling system temperature. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Rm/LG30.4.25. 25 m.p.h. was maintained by varying the throttle opening. It was noted that, due to the fall in power… | ||
| Scan035 | Analysing the effects of an exhaust baffle and butterfly system on engine temperature and performance. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/Rm/LG30.4.25. Test (A) shewed no difference. Test (B) shewing a difference which could only just be measured, and… | ||
| Scan036 | Graph showing heat flow to cooling water versus brake horsepower for an E.A.C. engine at a constant speed of 1500 RPM. | ||
| View original record | E.A.C. ENGINE. HEAT FLOW TO COOLING WATER ENGINE SPEED CONSTANT AT 1500 R.P.M. NO 1. SHOWS FALL IN HP & HT. FLOW AS BACK PRESSURE INCREASES NO 2. SHOWS FALL IN HP & HT. FLOW AS THROTTLE IS CLOSED FULL… | ||
| Scan037 | Blank document page with a Print Room date stamp from Derby. | ||
| View original record | ROLLS-ROYCE LIMITED. PRINT ROOM 1 - MAY 1925 DERBY. | ||
| Scan038 | Graph of heat flow to cooling water versus increasing exhaust back pressure for an E.A.C. engine at 1500 RPM and 50 B.HP | ||
| View original record | HEAT FLOW TO COOLG. WATER. WITH INCREASING EXHAUST BACK PRESSURE. E.A.C. ENGINE. AT 1500 RPM. AND 50 B.H.P. THE SPEED & H.P. IS CONSTANT FOR THIS TEST. AS THE EXH. BACK PRESSURE IS INCREASED THE POWER… | ||
| Scan039 | The reverse side of a document with a date stamp. | ||
| View original record | 1 - MAI 1925 Denu... | ||
| Scan040 | Modifications to address overheating on 40/50 HP cars, including chassis and radiator changes. | ||
| View original record | Hs X766 To Wor. from CJ. Copy to R. Copy to Hs. Re Over-Heating. CJ6/E30/4/25 Referring to Hs's memo. to R., Hs5/LG28/4/25 concerning overheating on 40/50 HP cars, as R. has now agreed to the… | ||
| Scan041 | Overheating complaints and planned experimental tests on the 40/50 model. | ||
| View original record | To Wor. from CJ. CJ6/E30/4/25 - 2 - allow it to boil without harm resulting. We do not want the Experimental Dept. to consider that the overhea ting nuisance has been dealt with simply because they… | ||
| Scan042 | Decision to revert to water heating for the throttle on 40/50 and EAC models. | ||
| View original record | 4766 To Hs. from R. SECRET. R2/M.5.25. EAC. AND 40/50. THROTTLE HEATING. X. 8230 X. 3436 X. 766 E. and I have come to the conclusion that we should be better off if we revert to water heating of the… | ||
| Scan043 | Increased petrol consumption in 40/50 HP cars with four-wheel brakes, questioning if it's due to the choke valve. | ||
| View original record | To Hs. from BJ. Copy to...THOR. By H. X766 BJ2/H4.5.25. OVERHEATING. With reference to Hs6/LG27.4.25, concerning overheating on 40/50 h.p. cars, it is stated that when the 40/50 h.p. with four-wheel… | ||
| Scan044 | Seriousness of customer complaints about engine overheating. | ||
| View original record | X766 HS To Hs. from CJ. Copy to R. re Over-Heating. CJ22/E4/5/25 Referring to the final paragraph of your memo on carburetter heating, Hs2/LG1/5/25, I hope that we shall never see again any reference… | ||
| Scan045 | Engine overheating, thermostat use, and cooling system component choices. | ||
| View original record | X766 To Hs. from R. c. to CJ. BJ. BY. c. to HY. HM. EP. OVERHEATING. R2/M5.5.25. X.766 X.8250 With reference to the Springfield use of copper tubes instead of our brass ones, this should make no… | ||
| Scan046 | Radiator and fan design modifications proposed for the 'X' series vehicles. | ||
| View original record | contd :- -2- louvred bonnets, so that we must expect trouble if the shutters are not used. We have made the radiator as high as permits of seeing the front wings, as wide as the frame allows, (which… | ||
| Scan047 | Overheating, petrol consumption, and the effect of 4-wheel brakes on carburetter settings. | ||
| View original record | R.R. 493A (50M) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. X766 REF: Hs4/LGS. 5. 25. To BJ. from Hs. c. to BY: c. to Wor. c. to H. OVERHEATING. Referring to BJ2/14.5.25. It does not… | ||
| Scan048 | Complaints about engine over-heating, referencing seasonal issues in Australia and a previous report from 1916. | ||
| View original record | To CJ. from Hs. Cd to R. X.766 Hs3/LGS. 5.25. OVER-HEATING. We are sorry that you should think that there has been any attempt for the Experimental Dept. to belittle the troubles of over-heating. All… | ||
| Scan049 | Overheating in the 20 HP model, referencing similar issues in the 40/50 HP 'Silver Ghost' and 'New Phantom'. | ||
| View original record | To Nor, from BJ. Copies to... Byr Hs. EB. X766 BJ6/H6.5.25. OVERHEATING. 20 HP. As the matter of overheating is now being so closely studied in regard to the 40/50 h.p. "Silver Ghost" and "New… | ||
| Scan050 | Requesting clarification on the definitions of 'normal' and 'loaded' vehicle states for ground clearance measurements. | ||
| View original record | To Hs. from BJ. BJ2/H9.5.25. Y766 OVERHEATING With reference to M2/M5.5.25, -R. refers to dropping the ground clearance to 10" normal instead of loaded. Can you please let us know exactly what He… | ||
| Scan051 | Instance of a car overheating during an ascent on the Riviera. | ||
| View original record | x766 H1/TB/11.5.25. F.R. To C.J. from H. copy to BJ. Re:- OVER-HEATING. In connection with the discussion of this matter which is at present proceeding, it would seem advisable to put on record… | ||
| Scan052 | Car overheating issues and proposing comparative tests with louvred bonnets and different shutter configurations. | ||
| View original record | x766 To Hs. from CJ. re Overheating. CJ2/E12/5/25 With reference to the enclosed memorandum from H. concerning his overheating experience on La Turbie, I think it would be as well if the present car,… | ||
| Scan053 | Overheating in 'Silver Ghost' cars, suggesting a new faster fan as a solution. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. X766 OVERHEATING. Hs2/LG14.5.25. We attach herewith a report which reviews the overheating problem. One point we suggest might be… | ||
| Scan054 | Engine overheating, analysing the factors involved and referencing the 40/50 'Silver Ghost'. | ||
| View original record | R.R. 493A (50m) (D.B. 173 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/Rm/LG14.5.25. OVERHEATING. During the past eighteen months the Expl: Dept: have done a large amount of work in… | ||
| Scan055 | Comparing engine overheating and cooling system efficiency against a Hispano Suiza engine. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Rm/LG14.5.25. The Hispano Suiza, on the other hand, is smaller, has overhead valves and high compression. The… | ||
| Scan056 | Comparing the radiator and cooling systems of the 'Silver Ghost' and 'Hispano' cars. | ||
| View original record | EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/Rm/LG14.5.25. to be in existance at the moment. We are therefore forced to use the same devices for dissipating superfluous cooling water heat as other cars.… | ||
| Scan057 | Comparing the overheating issues and cooling systems of the 'Silver Ghost' and Hispano Suiza models. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF: Hs/Rm/LG14. 5.25. large part in the cooling system. On the 'Silver Ghost' if the fan belt stretches and is not… | ||
| Scan058 | The cooling system limitations and overheating issues of the 'Silver Ghost' car. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF. Hs/Rm/LG14.5.25. the air temperature at which it will boil is reduced to 28.5°C. If the fan on the Silver Ghost is… | ||
| Scan059 | Page discussing the difficulties of testing for and predicting vehicle overheating issues. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF. Hs/Rm/LG14.5.25. to contend, is the methods of testing usually employed by those who complain of overheating. We have… | ||
| Scan060 | Chart comparing overheating test results for the Silver Ghost and Hispano Suiza models. | ||
| View original record | OVERHEATING TESTS SILVER GHOST AND HISPANO SUIZA CONDITIONS OF TEST ATMOSPHERIC TEMPERATURE AT WHICH THE COOLING WATER WILL INEVITABLY BOIL DRIVING FOR SUFFICIENTLY LONG ON FULL THROTTLE AT THE SPEED… | ||
| Scan061 | Vehicle overheating complaint and comparing historical test data for different bonnet designs. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. X766 REF Hsl/LG14.5.25. To CH: from Hs. OVERHEATING. X488 V4214 With reference to CJ2/E12.5.25. We attach herewith a reply in… | ||
| Scan062 | Engine overheating, focusing on fan belt tension and the effects of gear selection. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF HsEml/LG14.5.25. RE: OVERHEATING. With reference to H1/TB/11.5.25. We should like to point out that we do not consider,… | ||
| Scan063 | Cooling tests and the reasoning for abandoning louvered bonnets in favour of shuttered ones. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. o2o Expl. No. REF: Hs1/LG14.5.25. The methods we have now adopted for testing the cooling will show us differences of 2 or 3% and we can… | ||
| Scan064 | Continued discussion on the potential causes of a car overheating or boiling. | ||
| View original record | contd;- -2- Hs/Rml/LG14.5.25. his chances of over-heating are likely to be increased; this may possibly explain H's recent trouble, whereas previously, by adopting a different method of driving, his… | ||
| Scan065 | Chart comparing engine overheating test results for the Silver Ghost and Hispano Suiza models under various ventilation conditions. | ||
| View original record | OVERHEATING TESTS T.5573 SILVER GHOST AND HISPANO SUIZA CONDITIONS OF TEST ATMOSPHERIC TEMPERATURE AT WHICH THE COOLING WATER WILL INEVITABLY BOIL DRIVING FOR SUFFICIENTLY LONG ON FULL THROTTLE AT THE… | ||
| Scan066 | Testing bonnets with and without louvres on different car models to assess overheating and noise. | ||
| View original record | To Wor. from BJ. Copies to: Hs. By. PN. CWB. OVERHEATING. We should like to try as soon as possible three cars, each of which could be fitted with two bonnets, one with and the other without louvres,… | ||
| Scan067 | Arranging a test for cars with and without louvres to address overheating. | ||
| View original record | To BJ. from Wor. c. Hs. c. BY. [Struck out] c. PN. [Struck out] c. CWB. [Struck out] Handwritten: X766 OVERHEATING. Replying to your BJ7/H14/5/25, we hope to be able to make the necessary arrangements… | ||
| Scan068 | Engine cooling and customer complaints of water boiling troubles. | ||
| View original record | Hs. from Hm. C. to BJ. C. to BY. X766 Hm/WW5/W26.5.25. ENGINE COOLING. We attach hereto BJ's memo of the 25th. inst., ref. BJ6/H25.5.25, and shall be glad if you will reply direct to BJ. on the matter… | ||
| Scan069 | How to handle customer complaints about engine overheating as summer approaches. | ||
| View original record | To Hm. from BJ. BJ6/H25.5.25. ENGINE COOLING. with reference to BJ7/H24.2.25, I understand By. has considered this matter. Now that the summer and hot weather is approaching, please let me know how it… | ||
| Scan070 | Proposed reduction in ground clearance for the 'Silver Ghost' and 'New Phantom' models, citing overheating and sales concerns. | ||
| View original record | X766 To H. From BJ. Copy to Hs. By. GROUND CLEARANCE. With reference to R2/M5.5.25 (headed Overheating), towards the end you mention a suggestion of dropping the ground clearance to 10" normal instead… | ||
| Scan071 | Overheating issue in Mr. Glixten's car. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 4766 REF: HS6/LG4.6.25. To CWB: from Hs. 66-LM - MR. GLIXTEN'S CAR. X766 X.4117 We tried this car to see if we could account… | ||
| Scan072 | Page two of an experimental report discussing the effect of atmospheric temperature and vehicle weight on car performance. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF HS6/LG4.6.25. exceeded 16°C. A normal car in standard condition, if the atmospheric temperature exceeded 20.2°C.… | ||
| Scan073 | Arranging noise comparison tests between a louvred and standard bonnet, and fitting an improved silencer to car 44-PK. | ||
| View original record | W/S. CWB. from Hs. X766 EAC. 'V' series. X8770 Hs10/LG10.6.25. We are sending 44-PK to London tomorrow. We are taking the opportunity when you have this car of fitting to it a louvred bonnet and… | ||
| Scan074 | Arranging a noise comparison test between louvred and plain bonnets for an EAC 'V' Series car. | ||
| View original record | X766 S/W (Hs) CWB20/LH11.6.25. EAC 'V' SERIES. ------------------- Your Hs10/LG10.6.25. received. I will arrange for the comparison between the observed noises with louvred and plain bonnets to be… | ||
| Scan075 | Overheating tests with louvred bonnets for the Silver Ghost and 20 HP models, highlighting the urgent need for the 20 HP for other experiments. | ||
| View original record | To Wor. from Hs. X766 Hs6/LG15.6.25. OVERHEATING. X766 X5770 With reference to the attached ref. BJ11/H12.6.25. 44-PK car (EAC. 'V' series) was sent to London this weekend with plain and louvred… | ||
| Scan076 | Sending a Silver Ghost (5-EX) to Conduit Street regarding an overheating issue, along with bonnets. | ||
| View original record | W&r. from Hs. X766 Hs6/LG17. 6. 25. OVERHEATING. x55 We are sending 5-EX car to Conduit Street tomorrow. This car is a standard Silver Ghost. The car will have louvred and plain bonnets. It will carry… | ||
| Scan077 | Overheating, arranging for louvered and plain bonnets to be sent for Silver Ghost and 20HP models. | ||
| View original record | X766 Hs. - from Wor. Wor2/M17/6/25. OVERHEATING. I attach hereto copy of CWB's memo CWB11/LH16/6/25 received this morning, from which you will note London want you to send the Silver Ghost with… | ||
| Scan078 | Overheating, requesting bonnets for a 40/50HP 'Silver Ghost' and providing bonnet dimensions for 20HP cars. | ||
| View original record | COPY. S/W. (Wor.) CCWB11/LH16/6/25. OVERHEATING. BJ. has requested me to reply to your Wor5/M15/6/25. We have the E.A.C. car No.44-PK here with louvred and plain bonnets. Will you please send the… | ||
| Scan079 | Requesting the return of car 44-PK for experiments, suggesting a bonnet swap to release the vehicle. | ||
| View original record | To CWB. from Hs. Y766 Hs3/LG17.6.25. 44-PK CAR. X8770 With reference to the above car. We should like to know when we are going to have this car returned to the Works. At the moment there are a number… | ||
| Scan080 | Water boiling experiments comparing the New Phantom with the Silver Ghost. | ||
| View original record | To C.J. from R. c. to Wor. Hs. BY. c. to EP. PN. X766 WATER BOILING+ X. 766 X. 8250 X. 8310 Regarding water boiling Hs. definitely proves from experiments in France and Derby that the New Phantom is… | ||
| Scan081 | Forwarding Lord Montagu's experiences on the cooling of water circulation in cars in India. | ||
| View original record | X766 To Hs. from CJ. Overheating. CJ10/E16/7/25 I enclose herewith for your information copy of memorandum received from Lord Montagu containing his experiences as to the cooling of water circulation… | ||
| Scan082 | The experiences of Lord Montagu regarding vehicle water cooling systems in India. | ||
| View original record | COPY. MEMORANDUM on the Experiences of Lord Montagu of Beaulieu while Inspector of Motor Vehicles in India as to Cooling of Water Circulation on Cars and Lorries. In India in the summer the… | ||
| Scan083 | Methods taken to reduce engine boiling by altering radiators and fan blades. | ||
| View original record | -2- alteration of radiators. I should mention, however, that later on when the new models containing certain alterations in the radiators asked for me by arrived, the larger radiators provided got rid… | ||
| Scan084 | Page discussing experiments with fan designs and the fitting of radiator cowls to improve engine cooling. | ||
| View original record | -3- fan was polished there was a marked improvement in the suction of air, and that erratic currents were not caused inside the bonnet. Eventually nothing but polished aluminium fans were used,… | ||
| Scan085 | Page of a memo discussing the use of cowls and larger radiators for vehicle cooling in India. | ||
| View original record | -4- India, that all cars and lorries working during the summer in the hot districts of India should be fitted with cowls. In some cases the types of car used did not admit of the cowl being fitted,… | ||
| Scan086 | Engine overheating, discussing fan design, blade materials, and engine cowls. | ||
| View original record | R.R. 493a (50 M) (D.D. 91. 12-6-25) J.B.L. 4766 EXPERIMENTAL REPORT. Expl. No. REF: He1/AG17.7.25. To CJH from Hs. OVERHEATING. X766 X8220 X8250 With reference to the memo. from Lord Montagu. Our… | ||
| Scan087 | Radiator efficiency, comparing airflow at slow speeds for lorries versus higher speeds for cars on mountain passes. | ||
| View original record | contd :- -2- because in climbing mountain passes the lorries would be travelling at a very slow speed - 3 or 4 m.p.h. With a car however, travelling 20 to 30 m.p.h., the speed of the car would force… | ||
| Scan088 | Factors affecting jacket water boiling and comparing the performance of different car models under various conditions. | ||
| View original record | (COPY) x766 BY2/H.18.6.25. c. Hs. RE JACKET WATER BOILING. ----------------------- Referring to CJ2/E.16.6.25, and CJ9/E16.6.25, it is misleading to make comparisons of performance so entirely… | ||
| Scan089 | Engine cooling systems, radiator shutters, and factors influencing engine boiling. | ||
| View original record | -2- With regard to the question of the shutters or louvres being made to open completely, I assume this means the louvre to move through 90°. If this is what is intended, then it can easily be shewn… | ||
| Scan090 | Engine cooling, comparing water loss from boiling during test drives in France with a Spanish trials car. | ||
| View original record | -3- BY2/H.18.6.25. ------------ conditions experienced, a trailing or side wind would have caused the jacket water to boil. The experiences of drivers on test cars in France is that they have all… | ||
| Scan091 | Tests conducted at Brooklands on a 98-NK Barker Open Touring 'V' Series car. | ||
| View original record | R.R. 493a (50s) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. X766 REF:Hs/Rm/LGS.7.25. 98-NK - BARKER OPEN TOURING 'V' SERIES. X788 TESTS ON BROOKLANDS. Total weight of car complete with… | ||
| Scan092 | Short report on clutch spinning and acceleration test results. | ||
| View original record | Clutch spinning and acceleration. It was found that though in accelerating from 10 - 35 m.p.h. on 3rd. speed, the time taken was 3 secs. less than on direct drive, in accelerating from 10 - 60 m.p.h.… | ||
| Scan093 | The high-speed performance tests of the Phantom 'V' series at Brooklands. | ||
| View original record | BROOKLANDS TESTS. PHANTOM 'V' SERIES PERFORMANCE. HIGH SPEED TESTS. The first series of tests carried out on this car were concerned with maximum speeds. As the car is primarily intended to be used… | ||
| Scan094 | Analysis of road wheel horsepower, speed, and the effects of exhaust cut-out and vehicle windage. | ||
| View original record | -2- The peak of the road wheel H.P. curve with the cut-out closed is passed at 60 m.p.h. and after this point the H.P. available commences to fall off. When therefore the windage of the car is reduced… | ||
| Scan095 | Performance test results for the EAC 'V' Series vehicle, analyzing horsepower and acceleration. | ||
| View original record | PERFORMANCE TESTS - EAC. 'V' SERIES. GRAPH 1. This represents the road wheel H.P. curves taken immediately before the tests. In addition a curve of the calculated H.P. required to drive the car (curve… | ||
| Scan096 | Performance analysis of a 'V' series car, detailing carburation, maximum speed, and tractive resistance with comparisons to Phantom and Silver Ghost models. | ||
| View original record | -2- had this 'V' series car weighed only 2.15 cwts. We admit that even this is not as good as we anticipated having reagrd to the increase in M.E.P. There appeared to be a slightly weak spot in the… | ||
| Scan097 | Report page detailing the results and analysis of vehicle braking tests. | ||
| View original record | -3- been allowed for. This curve should be compared with curve B. Graph 1. as giving a direct indication of the accuracy of the tests. It will be observed that the two conform very closely. GRAPHS 11… | ||
| Scan098 | Performance test report detailing car speed and lap times under various conditions. | ||
| View original record | CONDITION OF CAR. 98-NK. 15 X 52 2 passengers. Wt. of car complete - no passengers - 2 tons. 7 cwts. 1 qr. CORRECTED SPEEDOMETER. Table Data: Row 1: Condition: No side curtains. C.O. closed. Hood up.… | ||
| Scan099 | Dynamometer curve data for chassis 98-NK before the Brooklands test. | ||
| View original record | DYNAMOMETER CURVE - EAC. 98-NK - BEFORE BROOKLANDS TEST. TABLE DATA | R.P.M. | H.P. C.O. open. | H.P. C.O. closed. | |---|---|---| | 500 | 24.5 | 24.1 | | 1000 | 46.5 | 45.7 | | 1500 | 66.7 | 64.5 | |… | ||
| Scan100 | Design and implementation of new bonnet louvres for the Phantom to solve overheating problems. | ||
| View original record | To BY, from DA. c. to Hs. x766 DA2/M8. 8. 25. RE. NEW PHANTOM LOUVRES. X. 8260 X. 766 X. 4214 Referring to BY/C8/K17.7.25., we believe that R. does not approve of the general use of louvres, and hopes… | ||
| Scan101 | Water overheating during a test run of the 9-G-lll car in France. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 4766 REF. Hs7/LG24.8.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to EP. Wor. WATER OVERHEATING. 4766 The… | ||
| Scan102 | Brooklands track tests with a 'V' series car. | ||
| View original record | R.R. 403 (40 H) (SL 42 12-7-23). J.H., D. X766 EXPERIMENTAL REPORT. COPIES TO: R.C.J. BJ. WOR. By. E. Da. EP. PN. OY. Expl. No. 788 REF. Hs3/LG25. 8. 25. OBJECT OF TEST. TESTER. Tests on Brooklands… | ||
| Scan103 | Car cooling tests conducted at Brooklands, detailing the effects of ventilation, environmental conditions, and fan efficiency. | ||
| View original record | R.R. 499a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/Rm/LGS.7.25. BROOKLANDS TESTS - CAR COOLING TESTS. (a) Advantages to be gained from ventilation at high speeds - 70… | ||
| Scan104 | Tests on the fan drive and radiator shutter performance. | ||
| View original record | H.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/Rm/LGS.7.25. Condition of Fan Drive. Top rad. temp: Standard. 89°C Fan removed. 94°C Drive pulled choc-a-bloc. 85°C… | ||
| Scan105 | Brooklands tests, defining 'critical atmospheric temperature' for cooling systems. | ||
| View original record | To B.J. from Hs. 4766 Hs4/LG29.8.25. BROOKLANDS TESTS. 4788 With reference to the attached ref. Hs/Rm/LG8.7.25. It will be seen that the wording in para. (c) refers to critical atmospheric temperature… | ||
| Scan106 | The difficulties in testing cooling systems and proposing new methods for radiator comparisons. | ||
| View original record | COPY RADIATOR COMPARISONS. The fundamental difficulties which have hitherto mitigated against satisfactory tests of the cooling system on the road are :- (a) Difficulty of obtaining the absolute value… | ||
| Scan107 | Report page detailing radiator cooling efficiency tests, referencing Newton's Law of Cooling and Method 'B'. | ||
| View original record | Contd. -2- Hs/Rm/LG25.11.24. circulation in this way being maintained normally by the pump. Top and bottom water temperatures and atmospheric readings were taken at fixed intervals throughout the run… | ||
| Scan108 | Continued description of a testing methodology for radiator efficiency and simulating hill climbing conditions on level ground. | ||
| View original record | Contd. -3- Hs/Rm/LG25.11.24. to get rid of the same quantity of heat, then the first radiator shews a gain of efficiency of 12% over the second. To obtain St for any radiator the car was driven at… | ||
| Scan109 | Page detailing radiator water temperature differences and the critical atmospheric temperature for boiling. | ||
| View original record | Contd. -4- Hs/Rm/LG25.11.24. The difference between the top and bottom radiator water temperature is approx. 10°C, it actually varies slightly with the speed. When therefore the mean radiator… | ||
| Scan110 | Forwarding the minutes of a Sales Conference. | ||
| View original record | A/o. X766 BJG/DN5.9.25. TO R. c. to BJ c. to Hs FROM BJ CJ has requested that a copy of the attached Minute of the Sales Conference on the 1st September should be forwarded to you for your kind… | ||
| Scan111 | Sales conference minute discussing the water overheating issue in the 20 HP model. | ||
| View original record | MINUTE OF SALES CONFERENCE 20 HP Water Overheating. It was reported that 9.G.3. running a 10,000 miles test in France, boiled for five hours with the air (shade) temperature at 28 to 30° C. (viz: 83°… | ||
| Scan112 | Overheating complaint on a 40/50 HP Chassis 14-TM belonging to Juan Correa. | ||
| View original record | X766 ~~Wg.~~ ~~Bg.~~ ~~c. Mr. Hm.~~ c. BY. c. Hs. EP1/H18.11.25. re. 40/50 HP. Chassis 14-TM. Juan Correa. Complaint of Over-heating. With reference to the above - Madrid memo RV5/JMA/10.11.25. and… | ||
| Scan113 | Radiator boiling issue on Chassis No. 63-AU, possibly caused by fitted shutters. | ||
| View original record | Br. from Hm. Hs. EP. X766 Hm13/W30.11.25. Re Radiator Shutters. Chassis No. 63-AU - Mrs. de Wichfeld. This car came in with a number of complaints, one of which was water boiling in Radiator in the… | ||
| Scan114 | Criticizing the design and control method of radiator shutters and their effectiveness in preventing boiling. | ||
| View original record | C O P Y. To BJ. from Hm. Hm4/W19.11.25. RADIATOR SHUTTERS. BJ21/H18.11.25. My criticism of the Radiator Shutter should not be taken to mean that the Shutters themselves would aggravate boiling in the… | ||
| Scan115 | Draft memorandum advising against fitting certain Bowden wire-operated radiator shutters to Silver Ghost cars. | ||
| View original record | COPY. B To Hm. from BJ. BJ11/H25.11.25. RADIATOR SHUTTERS. I propose to write the following memorandum to all concerned if the technical officials at the Works agree that it is correct :- Draft… | ||
| Scan116 | Arrangement of water connections for Series V & P.W. | ||
| View original record | E 72762 E.71268 CLIP E.71473 PACKING E.6933 NUT E.6932 BOLT E10106 CLIP E.70888 PACKING E.6933 NUT E.6932 BOLT E.70888 RUBBER E.71186 E.71316 FRONT SWEATING ARRGT SECTION ON WATER E.71757 K.323 BOLT… | ||
| Scan117 | The design and performance of radiator shutters, comparing them to third-party options. | ||
| View original record | R.R. 495a (50 H) (D.D. 31. 12-25) J.H.D EXPERIMENTAL REPORT. Expl. No. X766 REF: Hs/Bm2/LG1.12.25. To Hm. from Hs. RADIATOR SHUTTERS. V32499 With reference to your Hm4/W19.11.25. We consider it rather… | ||
| Scan118 | Overheating and cooling tests for chassis No. 14-TM. | ||
| View original record | To Hm. from Hs/Rm. X766 Hs/RmL/LG9.12.25. RE. CHASSIS NO. 14-TM. X766 X4117 Hm11/W16.11.25. We have carried out careful comparative tests on the above chassis with regard to overheating. We find that… | ||
| Scan119 | Schemes for improving carburation by increasing the temperature of the throttle valve and carburetter. | ||
| View original record | To Hs. } To BY. } FROM R. c. to CJ. BJ. RG. Mr. Claremont. X766 R1/M17.12.25. RE. CARBURATION. X.766 X.8080 X.8230 I have suggested a scheme for increasing the temperature of water to the throttle… | ||
| Scan120 | Modification to a Phantom's cooling system to run under pressure. | ||
| View original record | To RHC. from Hs/Rm. 4766 Hs/RmL/LG18.1.26. COOLING UNDER PRESSURE. In addition to running a car with evaporative cooling, we wish to fit up a Phantom to run under pressure cooling. To do this it is… | ||
| Scan121 | Merits of a whistle versus a red lamp to warn of a boiling radiator. | ||
| View original record | To B.J. from Hs. c. to CWB. c. to Hm. X766 Hs3/LG28.4.26. Water Boiling in the Radiator. X3875 Hm4/W24.4.26. With reference to the attached report. We have carried out experimental tests with a… | ||
| Scan122 | Indicator to show when water is boiling using a thermometer from the Cambridge Instrument Co. | ||
| View original record | To CWB. from Hs. c. to PN. c. to BJ. N766 HsR/LG6. 4. 26. INDICATOR FOR SHEWING WHEN WATER IS BOILING. X8875 We are obtaining a thermometer from the Cambridge Instrument Co., which makes an electrical… | ||
| Scan123 | Responding to a query about increasing the cooling capacity on Phantom cars. | ||
| View original record | To BJ. from Hs. c. to Wor. PN. c. to BY. CWB. c. to EP. X766 Hs2/LG2.7.26. X8950 X766 X8250 RE. Bt. 118-MC CAR. Answering your BJ9/E30.6.26. We think we ought to point out that there is no suggestion… | ||
| Scan124 | Limitations of the water cooling system in Phantom models and considering alternative methods. | ||
| View original record | Hs 4766 RECEIVED 24 AUG 1926 PN1/DN24.8.26. TO Hs c. FROM P.N. ENGINE COOLING - PHANTOMS. In reviewing our present position in respect of the degree of effectiveness we have so far achieved with… | ||
| Scan125 | Typed memorandum discussing a steam-based cooling system with a safety valve. | ||
| View original record | -2- continuously positively pumped again to the engine cylinder heads, the whole system being closed. The provision of a safety valve can be of relieving pressure at perhaps 4 or 5 lbs per square… | ||
| Scan126 | Engine cooling on the Phantom, comparing it to the Silver Ghost and referencing experiments with different cooling systems. | ||
| View original record | 4766 To PN. from Hs. c. to BJ. Hs1/LG25.8.26. ENGINE COOLING ON PHANTOM. X8250 X766 With reference to PN1/IN24.8.26. It has been noticeable that we have heard of less complaints from over-heating of… | ||
| Scan127 | Engine over-heating issues on Phantom models and a proposed solution involving a pressure system. | ||
| View original record | X766 PN12/DN26.8.26. TO Hs c. to BJ FROM P.N. Engine cooling on Phantoms. I have received your Hs1/LG25.8.26. I quite agree that the complaints from owners in respect of over-heating with our bigger… | ||
| Scan128 | Trial of a lightened axle and hydraulic dampers on car 8-EX, and a request for sketches of the pressure cooling system from car 10-EX. | ||
| View original record | Expl: Dept: Messrs. Rolls-Royce Ltd., Derby, England. 26th. Aug. 1926. Hotel de France, Chateauroux, Indre, France. Rm. from hs. When PN. takes 8-EX car XXXXXXXX in order to try out the lightened axle… | ||
| Scan129 | Overheating tests in France, comparing the fan and radiator positions on experimental cars 8-EX and 12-EX. | ||
| View original record | To B.J. from Hs. c. to PN. c. to CWB. X766 Hs4/LG21.9.26. TESTS ON OVER-HEATING IN FRANCE. X766/X7250 With reference to PN's suggestion that the probable reason that 8-EX could not be made to boil on… | ||
| Scan130 | Correcting a previous reference from 8-EX to 12-EX concerning tests on over-heating in France. | ||
| View original record | X766 To Hs. from BJ. Tests on Over-Heating in France. Copy to PN. Copy to CWB. BJ1/E22/9/26 With reference to Hs4/LG21/9/26, PN informs me that his remarks should have referred to 12-EX and not to… | ||
| Scan131 | CWB to Hs. discussing the superior cooling performance of the 12-EX model and potential modifications. | ||
| View original record | X. 756 S/W/ Hs. from CWB. CWB8/GM/30.9.26. 12-EX COOLING. X. 7080 The cooling of 12-EX was found to be very satisfactory as reported in my general report on the running of this car. Have you been able… | ||
| Scan132 | Comparing the 12-EX car's cooling system to the standard Phantom, concluding pressure cooling is an unnecessary complication. | ||
| View original record | To CWB. from Hs. X766 HsI/LGI.10.26. 12-EX CAR - COOLING. X766 X8250 Comparing 12-EX car with the standard Phantom, we find that there is no difference in the cooling. The average daily records of air… | ||
| Scan133 | Power curve graph comparing a steam cooling system and standard water cooling. | ||
| View original record | POWER CURVE 11 G III R.R. STEAM COOLING SYSTEM AND. STANDARD WATER COOLING. ROAD WHEEL B.H.P. ENGINE R.P.M. WATER COOLING. STEAM COOLING. ENGINE TEMP. (WATER COOLING) AT 80°C N.B. ENGINE BECOMES TOO… | ||
| Scan134 | Cover sheet with handwritten reference numbers and a company stamp. | ||
| View original record | X766 X766 / X.5771 ROLLS-ROYCE LIMITED. PRINT ROOM 27 SEP. 1926 DERBY. | ||
| Scan135 | Modifications to radiator design and dimensions, including integral shutters and a comparison of front areas for various models. | ||
| View original record | To RG. Hs. from DA. 4766 DAL/M25.1.27. ROLLS-ROYCE LIMITED EAC. 8. RADIATOR WITH INTEGRAL SHUTTERS ETC. X.7250 X.8250 X.766 As regards the thickness of the radiator when fitted with integral shutters,… | ||
| Scan136 | Analysis of radiator cooling performance, comparing revisions of the EAC.8 radiator with different tube dimensions. | ||
| View original record | -2- The increases on the original EAC.8. are due to the matrix going further below the top of the frame, and also due to the construction doing away with the side plates not in contact with water. We… | ||
| Scan137 | Fan position tests on the 12-EX to increase cooling efficiency and its potential application to Phantom models. | ||
| View original record | X766 To Da. from Hs/Rm. c. EY. Hs/Rml/T25.4.27. X7250 We have been carrying out some tests to determine whether the fan when pushed up close to the radiator as on 12-EX has any increased cooling… | ||
| Scan138 | Use, necessity, and cost of bonnet shutters versus louvres on the 40/50 HP chassis. | ||
| View original record | To R. from BJ. c to Hs. c. to BY. COPY. X766 BJ5/D20.6.27. My dear R., Shutters in Bonnets - 40/50 HP. Chassis. X1085 X8260 I have made careful enquiries in regard to the above and have ascertained… | ||
| Scan139 | Cost and simplification of 40/50 bonnet shutters and louvres. | ||
| View original record | To BJ. from R. c. to Hs. BY. X766 R1/M23.6.27. 40/50 BONNET SHUTTERS. X. 766 X. 8260 X.1085 I quite agree with your memo. BJ5/D20.6.27., and that is why it was done years ago. Now things have slightly… | ||
| Scan140 | Removal of rear shutters from a standard car model not intended for tropical climates. | ||
| View original record | To BJ. from Hs. c. to R. Y766 HS6/LG30.6.27. X1885 With reference to BJ16/E27.6.27. We think there should be no objection to deleting the rear shutters on the present standard car not intended for… | ||
| Scan141 | Temperature tests at Brooklands comparing the effects of different car alterations on temperature and performance. | ||
| View original record | To R. from Hs/Rm. c. to BJ. Wor. c. to RG. E. c. to DA. BY. c. to OY. X766 Hs/Rm2/LG12.9.27. TEMPERATURE TESTS - BROOKLANDS. X8774 X788 These tests were conducted to determine the effect of various… | ||
| Scan142 | Technical comparison of the 10-EX and a standard car's cooling system, with conclusions on ventilation. | ||
| View original record | contd :- -2- of the rear seat rises 5°C or so when the car is allowed to stand after a fast run i.e. it is the heat that rises vertically that causes unpleasantness, and when running, the draught… | ||
| Scan143 | Summary of temperature tests conducted at Brooklands under various car conditions. | ||
| View original record | 10-EX - BROOKLANDS TEMPERATURE TESTS. | Condition of car. | CUTOUT OPEN. | | | | CUTOUT CLOSED. | | | |… | ||
| Scan144 | High-speed cooling tests comparing shutters to a louvered bonnet for a sports car. | ||
| View original record | To BJ. From Hs. 4766 Hs1/LG19.9.27. With reference to BJ4/E14.9.27. X55 Our high speed tests shew that the benefit derived from opening either the front or rear shutters only is slightly more than… | ||
| Scan145 | Suitability and reliability of automatically controlled radiator shutters. | ||
| View original record | To OY. from R. c. to BJ. BY. Hs. 4766 R3/M24.9.27. X.8250 X.766 X.3375 X.3499 AUTOMATICALLY CONTROLLED RADIATOR SHUTTERS. With reference to your CY10-E-91o27 we have had these automatically controlled… | ||
| Scan146 | Technical bulletin discussing engine overheating caused by choking of the radiator core from hard water deposits. | ||
| View original record | 7766 To Hm. - for Depots. from Hs/Rm. Hs/Rm2/LG24.1.28. OVER-HEATING. Y766 X8250 Recent tests have indicated that the efficiency of the Rolls-Royce cooling system may be impaired by the choking of the… | ||
| Scan147 | Methods for testing radiator obstructions and cleaning the core with a chemical preparation. | ||
| View original record | contd :- -2- of the radiator should then be filled as rapidly as possible. If water can be passed into the top tank more rapidly than it will flow out through the matrix, obstruction should be… | ||
| Scan148 | Instructions for cleaning radiators with 'Kleenwell' and a recommendation to use soft water to prevent choking. | ||
| View original record | contd :- -3- vigorously with the mixture inside at 60º - 70ºC for half an hour or so. If not sufficient the treatment should be repeated. If pressed for time, the mixture may be inserted in the… | ||
| Scan149 | Graph illustrating water circulation flow rates in a complete water system against engine RPM. | ||
| View original record | CIRCULATION IN COMPLETE R R WATER SYSTEM WATER FLOW GALS/MIN 10 20 30 40 STANDARD FLOW MINIMUM EFFICIENT FLOW TYPICAL FLOW OF OBSTRUCTED RADIATOR ENGINE R.P.M 500 1000 1500 2000 2500 3000 | ||
| Scan150 | The reverse of a document or photograph with a date stamp from the print room. | ||
| View original record | PRINT ROOM, 23 JAN 1928 DERBY. | ||
| Scan151 | Blueprint detailing two methods for testing radiator efficiency and system restriction. | ||
| View original record | CONNECTING TUBES & TOP OF U TUBES TO BE FILLED WITH WATER. Hg. 2FT. 1FT. ACCURATE TEST FOR RESTRICTION IN SYSTEM. SHORT END OF VENTURI TO FRONT OF CAR. ROUGH TEST FOR RADIATOR FREEDOM. 18". STANDARD… | ||
| Scan152 | Blueprint detailing the design and dimensions of a Water Venturimeter. | ||
| View original record | WATER VENTURIMETER. SWEATED TOGETHER LAW OF VENTURI Q GALL/MIN = 8.64√H OR 9" DEFLN = 25.92 GAL/MIN H = INS OF Hg. SECTION. "A.A." THESE HOLES MUST BE IN LINE. 4 HOLES .0625 DIA: EQUALLY SPACED. .500… | ||
| Scan153 | Table and calculations showing the relationship between water's boiling point, pressure, and head. | ||
| View original record | X766 16.7.28. BOILING POINT OF WATER AS AFFECTED BY HEAD. Temp. (°C) Pressure (lbs/sq.") Diff. Diff. per degree. 90 10.16 95 12.26 2.10 .42 100 14.70 2.36 .47 110 20.8 6.10 .61 Between 100°C and 110°C… | ||
| Scan154 | Overheating issues of the 20 HP fan and potential improvements. | ||
| View original record | X766 To BY. from Hs/Rm. Hs/Rm/LG17.7.28. 20 HP. FAN. X5220 At the present moment the 20 HP. is very much more likely to suffer from over-heating than the 40/50 HP. We went to a great deal of trouble… | ||
| Scan155 | Depot sheet discussing procedures for addressing car over-heating by cleaning oxide deposits from cylinder blocks. | ||
| View original record | To Hm. from Hs/Rn. X766 HS/RmG/LG9.4.29. DEPOT SHEET. X766 X5250 (struck through) OVER-HEATING OF CAR. We understand that the Repair Dept. make a point of removing the plates and core plugs from the… | ||
| Scan156 | Obstructed radiators and boiling, including a specific case involving black slime and a note on anti-freeze solutions. | ||
| View original record | X766 S/W (Rm) .... from H. H5/LH.1.5.29. RE: OBSTRUCTED RADIATORS & BOILING. Hs/RM2/LG30.4.29. ------------------- As long as these cases of trouble are noted and watched, we presume from what you… | ||
| Scan157 | Cooling tests and proposed improvements for the 20 HP car. | ||
| View original record | HS. X766 Hs/Rnl 20 HP. COOLING. The only cooling tests we have carried out on the 20 HP. car were made in Aug. 1923 when we took 6G. up the Cat & Fiddle. The dimensions of the radiator on this car… | ||
| Scan158 | Comparison of radiator specifications and performance expectations for various car models. | ||
| View original record | -2- From our results on the Phantom we cannot expect more than 5% to 10% improvement from these two modifications and therefore it would appear that something else will have to be done to deal with… | ||
| Scan159 | Loan of 'SS' Car 19-EX for opinions and addressing an overheating complaint. | ||
| View original record | To Sg. from Hs. x766 Hs5/LG27.5.29. 'SS' CAR - 19-EX. x7770 With reference to PN2/W24.5.29. We have loaned to EP. this car for the last two or three days in order to obtain his opinion. We also… | ||
| Scan160 | Comparative analysis of the radiator cooling system on 'SS' cars versus Phantom models. | ||
| View original record | To R. from Hs/Rm. c. to SG. Wor. c. to DA. E. c. to PN. OY. c. to BY. Hm. 4766 Hs/Rml/LG27.5.29. 47250 48250 COOLING ON 'SS' CARS. In view of the fact that the cooling of the SS. has been criticised,… | ||
| Scan161 | High-speed test report comparing bonnet ventilation and cooling performance to address vehicle overheating issues. | ||
| View original record | contd :- -3- for hill climbing than any 40/50 HP. car we have previously had. We know that the specific complaint was that the car over-heated at high speeds. We have repeatedly proved that high speed… | ||
| Scan162 | Comparison of car performance regarding overheating and the effectiveness of louvred bonnets. | ||
| View original record | contd :- -3- It will be thus seen that in both cases the SS. car shews up substantially better than the present standard production chassis. The test, however, emphasises our previous remarks that it… | ||
| Scan163 | Comparison of engine water temperatures during a hill climb test for three car models, with corresponding radiator specifications. | ||
| View original record | TEST CAT AND FIDDLE NO BONNET AIR TEMP 15°C. VENTILATION HILL EACH CAR CARRIES 3 PASS AND 5 CWT BALLAST ① S.S. CAR 22 EX WT. EMPTY 48.3 CWT ② PHANTOM CAR 14 EX. WT. EMPTY 49.75 CWTS ③ OLD PHANTOM CAR… | ||
| Scan164 | Largely blank document page stamped by the print room. | ||
| View original record | U7: S: W 2 SE ROYCE, LIMITED PRINT ROOM, 29 MAY 1929 DERBY. | ||
| Scan165 | Letter discussing proposed performance tests in the mountains of France for chassis 21-EX. | ||
| View original record | S/W. Hs...from PN. Copy to Sg. Wor. X766 PN.1/WT7.6.29. Chassis No. 21-EX. In reply to your letter Hs2/LG6.6.29 which I have discussed with Sg. we agree that during the time the car will be in London… | ||
| Scan166 | Plans and rationale for testing the 21-EX car's cooling system against the Phantom. | ||
| View original record | To PN. from Hs. c. to Sg. Wor. x766 Hs3/LG11.6.29. 21-EX CAR. x766 x7770 If 21-EX car is going to Grenoble for the express purpose of testing water temperatures, then the only reliable way to carry… | ||
| Scan167 | Vehicle's performance during a road trip from Bourges to Grenoble, detailing speed and steering issues. | ||
| View original record | HOTEL MAJESTIC GRENOBLE Telephone: 3-90 Télégrammes: MAJESCOTEL-GRENOBLE Même Direction AUTUN Hotel St Louis et de la Poste BOURG-EN-BRESSE Hotel de France SAULIEU Hotel de la Poste A. BONNEAU,… | ||
| Scan168 | Road test report detailing water temperature, brake adjustments, and fuel consumption during a journey through France. | ||
| View original record | Father likes it. Regarding water temperature, on our run from Paris to Chateauroux, with radiator shutters fully open, and bonnet shutters closed, the highest temperature attained was 84°C. The bonnet… | ||
| Scan169 | Letter regarding cooling tests for the 20 HP, 17-G type chassis, and potential modifications. | ||
| View original record | X766 Expl: Dept: Messrs. Rolls-Royce Ltd., Derby. Angleterre. Hs/RM/LG25. 6. 29. Y3806 Y5840C Hotel de France, Chateauroux, Indre, France. Mr. Hancock from Hs/Rm. We wired you yesterday to do some… | ||
| Scan170 | Vehicle modifications regarding shock damper lubrication, steering flow, and issues with fuel starvation at high speeds. | ||
| View original record | contd :- -2- We observe that the rear and front shock damper connecting links are getting insufficient lubrication. Will you please remove the drip plugs which we do not consider adequate and fit… | ||
| Scan171 | Report from Grenoble detailing a car test run on mountain roads, including a temperature test. | ||
| View original record | HOTEL MAJESTIC GRENOBLE Même Direction AUTUN Hotel St Louis et de la Poste BOURG-EN-BRESSE Hotel de France SAULIEU Hotel de la Poste A BORNEAU (COTE-D'OR) Même Administration NICE Hotel Ruhl et des… | ||
| Scan172 | Vehicle performance metrics and observed mechanical faults during a road test. | ||
| View original record | 7. Chambéry 886 ft above sea level. Top of Col du Granier. 3,800 ft " " Climbed in 3rd Gear all the way. Highest water temperature attained 93°C. Atmospheric temperature 76°F. Both Radiator and Bonnet… | ||
| Scan173 | Vehicle's performance during mountain ascents of the Col du Lauteret and Col du Galibier. | ||
| View original record | HOTEL MAJESTIC GRENOBLE Telephone: 3-90 Telegrammes: MAJESCOTEL-GRENOBLE Meme Direction AUTUN Hotel St Louis et de la Poste BOURG-EN-BRESSE Hotel de France SAULIEU Hotel de la Poste A. BONNEAU,… | ||
| Scan174 | Test climb of the Galibier pass, detailing performance and a body boom issue. | ||
| View original record | Galibier 8400 ft. 2nd Gear and occasional 1st Gear on hairpin bends. Atmospheric temp at commencement of climb ie. 6800 ft. 13°C. Water temp at top of climb ie:- 8400 ft. — 85°C. Radiator and bonnet… | ||
| Scan175 | Letter on Hotel Majestic Grenoble letterhead detailing a test drive of an Invicta car up the Col du Porte. | ||
| View original record | HOTEL MAJESTIC GRENOBLE Même Direction AUTUN Hotel St-Louis et de la Poste BOURG-EN-BRESSE HOTEL DE FRANCE SAULIEU HOTEL DE LA POSTE A. BONNEAU, Directeur-Général Même Administration NICE Hotel Ruhl… | ||
| Scan176 | Engine boiling after a 2000ft climb, with observations on competitor vehicle testing. | ||
| View original record | thermometer after climbing 2000 ft and remained such to the top. The engine was actually boiling when we reached the top and 1 1/2 pts of water was added to fill up the radiator to normal level.… | ||
| Scan177 | Road test in the French Alps, detailing engine performance and cooling. | ||
| View original record | HOTEL MAJESTIC GRENOBLE Téléphone: 3-90 Télégrammes: MAJESCOTEL-GRENOBLE Même Direction AUTUN Hotel St. Louis et de la Poste BOURG-EN-BRESSE Hotel de France SAULIEU Hotel de la Poste A. BONNEAU,… | ||
| Scan178 | Road test report detailing vehicle cooling, tyre wear on mountain roads, and daily running statistics. | ||
| View original record | fairly warm. There were 4 passengers in the car and PN driving. Bonnet and radiator shutters fully open. PN and Grylls went [crossed out: went] up the same mountain yesterday on the Invista car, and… | ||
| Scan179 | Instructions for experimental car testing regarding cooling, engine noise, body booming, and squeaking servos. | ||
| View original record | X766 Expl: Dept: Messrs. Rolls-Royce Ltd., Derby, Angleterre. Hs/Rnl/LG28. 6. 29. X5840c Hotel de France, Chateauroux, Indre, France. Mr. Hancock from Hs/Rm. We have received your report on the… | ||
| Scan180 | Servo squeaking and a proposal to test a Phantom front axle on an S.S. model to improve steering. | ||
| View original record | contd :- -2- woven cotton. We find, as you know, that when we completely set the cotton lining with oil the efficiency drops tremendously. We should like you to see whether you can stop the servo… | ||
| Scan181 | Cooling system issues and proposed improvements for SS cars. | ||
| View original record | contd :- -3- the Works producing SS. axles as soon as possible. We should like you to make this test No.1. on your programme. (4) Cooling. I have been carrying out a great many bench tests which show… | ||
| Scan182 | Instructions for research work and testing on a vehicle, including fan position, axle, engine mountings, and steering. | ||
| View original record | contd :- -4- and at the same time we are asking you to confirm our results. We have moved the fan from its standard position to within ¼" of the matrix. You can easily do this by putting a distance… | ||
| Scan183 | Vehicle's performance during a mountain climb in France, written on hotel letterhead. | ||
| View original record | HOTEL MAJESTIC GRENOBLE Telephone: 3-90 Télégrammes: MAJESCOTEL-GRENOBLE Même Direction AUTUN Hotel St. Louis et de la Poste BOURG-EN-BRESSE Hotel de France SAULIEU Hotel de la Poste A. BONNAUD,… | ||
| Scan184 | Brake improvements, mileage, and petrol consumption. | ||
| View original record | very effective this last 2 days. All adjustments are O.K and this morning I washed out the front brake drums with petrol, and it has made a considerable improvement. It rather points to oil-getting on… | ||
| Scan185 | Results of 20 HP cooling tests in France, particularly for the 21-EX model. | ||
| View original record | X766 To Hs. from Sg. re 20 HP Tests in France. Sg18/E1.7.29 Copy to Wor. C. Thanks for Hsl/LG28.6.29. I have advised PN of the contents of paragraph 1 and have also asked him to try to arrange what… | ||
| Scan186 | Letter from Grenoble detailing a hill climb test to Le Revard to check the engine's water temperature. | ||
| View original record | HOTEL MAJESTIC GRENOBLE Telephone 3-80 Telegrammes MAJESCOTEL-GRENOBLE Meme Direction AUTUN Hotel St. Louis et de la Poste BOURG-EN-BRESSE Hotel de France SAULIEU Hotel de la Poste A GORNEAU Directeur… | ||
| Scan187 | Journey's itinerary, mileage, and petrol consumption. | ||
| View original record | Going on to Paris on Wednesday, and according to PN arrive back in England on Friday, most probably sailing from Boulogne on Friday afternoon. Mileage run today — 100 miles. Petrol used — 55 litres.… | ||
| Scan188 | Issues with choked radiators and recommending new S.S. radiator tubes and stricter production testing. | ||
| View original record | x766. To BY. From Hs/Rn. c. to Wo R. filing Hs/Rn. 2/MJ. 24.7.29. x7250. x766. S.S. RADIATOR TUBES. -------------------- In view of the trouble that has arisen with F.2 B. series onwards, with… | ||
| Scan189 | Investigation into complaints of radiators becoming choked in service on F.2 B series cars. | ||
| View original record | To R. From Ha/Ru. c. to Sg. Wo F. c. to E. Da. c. to EY. x766. x7250 x766. RADIATORS. -------------- We have received several complaints of Radiators becoming choked in service. These are almost… | ||
| Scan190 | The hydraulic restriction and cooling efficiency of a gap radiator matrix. | ||
| View original record | -2- gap radiator. The hydraulic restriction of the matrix is much reduced. From our experience we are sure that increasing this gap will not reduce the cooling efficiency of the matrix. HS. | ||
| Scan191 | Recommendation on radiator tube selection for the S.S. model based on comparative cooling capacity tests. | ||
| View original record | X766 To R. from Hs/Rn. Copy to Sg. Wor. " " BY. Da. E. " " OY. Hm. Hs/Rn3/BE7.8.29. X7250 X766 S.S. RADIATORS. We have made a careful comparative test of the 6/7 m.m. tubes and the 5 1/2/7 m.m. tubes… | ||
| Scan192 | Radiator boiling issues on Phantom models, related to the spacing between radiator tubes. | ||
| View original record | RM. FROM DA/EV. Copy to HK X766. DA/EVL/M20.8.29. re. BOILING ON PHANTOMS. This subject has not any direct connection with my legitimate sphere of activites, but I came across it at Sevres. As you… | ||
| Scan193 | Technical memorandum discussing facts about car cooling systems, radiator obstructions, and hydraulic restrictions. | ||
| View original record | To E. from Hs/Rn. C. to Ba. X766 Hs/Rn.2/MJ.31.8.29. COOLING SYSTEMS ----------------- X7250. X766 There are one or two facts in connection with the car cooling systems which have not been circulated.… | ||
| Scan194 | Analysis of cooling system inefficiencies related to boiling, pump design, electrolytic corrosion, and radiator tube blockage. | ||
| View original record | -2- reaches 100°C. This means that even in a new car the system is least efficient when cooling is most required. It explains the phenomena of being unable to cool down easily once the radiator has… | ||
| Scan195 | Radiator outlet design and filter performance, including a diagram of a filter with a cleaning connection. | ||
| View original record | -3- CLEANING CONNECTION FILTER GRID The resistance of the matrix will ensure that sufficient pressure is put on the grid to force any obstruction out of the filter. (5) One other point we raise is… | ||
| Scan196 | Graph showing the effect of temperature on circulation through an SS Radiator with 6/7 m/m tubes. | ||
| View original record | EFFECT OF TEMP ON CIRCULATION THROUGH SS RADIATOR 6/7 M/M TUBES. STANDARD S.S. PUMP CIRCULATES WATER THROUGH A HEATING TANK AND THE S.S. RADIATOR PHANTOM CIRCULATION 90°C S.S. 16°c S.S. 90°c S.S. 95°c… | ||
| Scan197 | Test report comparing water flow restriction through various radiator types and configurations. | ||
| View original record | -4- RADIATOR RESTRICTION TESTS. A tank of 20 gal. capacity supplied water to the radiator from a head of 3 ft. 6 ins. above the top of the matrix. (See sketch). The quantity of water delivered direct… | ||
| Scan198 | Dimensional drawing and table for radiator matrix and tubes for various models. | ||
| View original record | RADIATOR MATRIX AND TUBE DIMENSIONS Diagram Labels: MATRIX, A, B, C, D, E Table Data: INDEX | S.S E.77675 | STANDARD PHANTOM F.77644 | EARLY PHANTOM E.73892 | BUMP ? | E.77047 10 EX. A. | 24.0" |… | ||
| Scan199 | Blueprint diagram of a radiator test rig. | ||
| View original record | REPLENISHING SUPPLY FROM THE MAIN 1 3/16 BORE. 3'6" TOP OF MATRIX 5'0" 1 3/16 BORE. RADIATOR TEST RIG. 23. AUG. 1920 4 | ||
| Scan200 | Choking issue in cooling systems by comparing the gap area and hydraulic mean depths of different series of tubes. | ||
| View original record | HS/RM. FROM DA. X/66 DA2/M24.8.29. C. to BY. E. COOLING SYSTEMS. X.7250. X.766. With reference to HS/RM2/MJ 21829. we think there is still something mysterious about the choking up: (1) The gap seems… | ||
| Scan201 | Radiator design, specifically concerning the top tank, tubes, flanges, and the potential addition of a filter. | ||
| View original record | (2) this does not seem an important matter as the hydraulic resistance of this rectangle cannot be a serious factor in itself. As regards the bottom of the top tank overlapping the tubes more in SS.… | ||
| Scan202 | Recommendations to prevent radiator blockages using distilled water and sodium phosphate. | ||
| View original record | WHS Wor x766 BY1/G.26.8.29. E. H. c. Hs. x766. x1066. RADIATORS. Referring to C17/C13.8.29. with attached papers which I return herewith, since receiving the memo in question on the 17th inst. I have… | ||
| Scan203 | Procedure for cleaning and repairing blocked radiators. | ||
| View original record | - 2 - 1/- For a complete blockage the radiator should be dismantled from the chassis, turned upside down and filled with a 5% solution of caustic soda. This solution should be filled in hot, and the… | ||
| Scan204 | Proposal for a pamphlet detailing a new water system cleaning procedure using sodium phosphate. | ||
| View original record | (S8) - 3 - BYL/G.26.8.29. previous instructions to the extent of recommending the addition of 1 1/2 ozs. of sodium phosphate to the water system after the radiator had been thoroughly cleaned/by the… | ||
| Scan205 | Hydraulic resistance and choking issues in F2B, S.S., and V series radiators. | ||
| View original record | X766 To Da. from Hs/Rm. c. to Ev. E. Hs/Rm1/MJ30.8.29. COOLING SYSTEMS. X7250 X766. With reference to Da2/M24.8.29. RADIATORS CHOKING UP. We do not think that there is any mystery in the fact that the… | ||
| Scan206 | Radiator obstruction, specifically in the top row of tubes, and the electrolytic action of aluminium heads. | ||
| View original record | -2- contd. dictates the depression on the suction side of the pump under normal conditions, our main worry at the moment is the increase in this restriction due to obstruction. Opening up radiators… | ||
| Scan207 | Tests for radiator water loss, determining the optimal outlet pipe restriction without impairing cooling. | ||
| View original record | x766 x7250. x766. x4516. LOSS OF WATER FROM RADIATORS. Tests were carried out to determine what restriction could be put in the outlet pipe from the cylinder block without impairing the cooling… | ||
| Scan208 | Results of tests on water pump cavitation for radiators. | ||
| View original record | To R. from Hs/Rm. c. to Sg. Wor. c. to E. Da. c. to Hy. Rg. c. to Lr. X766. Hs/Rm3/MJ10.1.30. X5250 X7256 X4516 X766. RADIATORS. With reference to R11/M6.12.29. We have carried out a number of tests… | ||
| Scan209 | Analysis of pump cavitation, hydraulic restriction, and water flow limitations in a radiator. | ||
| View original record | -2- Hs/Rm3/MJ10.1.30 contd. appertained at the point before cavitation started. In agreement with this, the depression on the suction side of the pump also remains constant. The cycle appears to be… | ||
| Scan210 | The performance and hydraulic resistance of various radiator and cooling systems. | ||
| View original record | Hs/Rm3/AJL10.1.30 contd. -3- present standard S.S. large gap radiator. In considering this it must be borne in mind that the drop across the radiator is about 10°C, and that therefore the highest… | ||
| Scan211 | Engine cooling system phenomena, including radiator circulation, back pressure, and top tank capacity. | ||
| View original record | -4- Hs/Rm3/AJL10.1.30 contd. standard (Graph 4 and 1 Hs/AJL1.9.1.30). These show that the circulation cannot be reduced very much. They also show than any such restriction must not be put on the far… | ||
| Scan212 | Summary of results regarding radiator design, cavitation, and cooling system improvements, including a comparison with Chrysler. | ||
| View original record | HS/Rm3/MJ10.1.30 contd. -5- at the rear of the top tank (See sketch). We attach a list of radiator weights. The Chrysler succeed in cooling their car with a very small matrix, but nevertheless our own… | ||
| Scan213 | Comparison table of radiator specifications including dimensions, hydraulic resistance, and weight. | ||
| View original record | RADIATOR. Tube Dimensions Hydraulic Resistance on Rig Time Wt. Rad. Wt. Rad. Series & Piece No. & Piece No. for 60 galls. Empty. Full. V. Series E73892/3. E.18491 100 secs. 126.5 169.75 8 - 7 mm.… | ||
| Scan214 | Tests on the Phantom II water cooling system to determine the effects of temperature and restriction. | ||
| View original record | To R. From Hs/AJL. c. to SG. Wor. c. to E. Da. c. to RV. Handwritten: 8766 Hs/AJL.1/EAJ.13.1.30. PHANTOM 11 WATER COOLING SYSTEM. ------------------------------ Handwritten: x766 x7250 Several tests… | ||
| Scan215 | The effects of cavitation and pressure within a fluid system due to restrictions. | ||
| View original record | -2- Hs/AD.1/AL.13.1.30.Contd. system over 2500 r.p.m., when this takes place, the flow does not cease altogether but is only reduced slightly from what it would be were there no cavitation. As soon as… | ||
| Scan216 | Graph showing the effects of temperature and restriction on water flow and suction side depression for the Phantom II cooling system. | ||
| View original record | PHANTOM II COOLING SYSTEM. EFFECT OF TEMPERATURE AND RESTRICTION ON WATER FLOW AND SUCTION SIDE DEPRESSION. RESTRICTION USED IS A PLATE DRILLED WITH ONE HOLE .6 DIAM. PLACED IN THE DELIVERY PIPE JOINT… | ||
| Scan217 | Graph showing pressure versus engine RPM in the Phantom II cooling system with different nozzle and valve configurations. | ||
| View original record | PHANTOM II COOLING SYSTEM PRESSURE IN WATER JACKETS AND RUBBER JOINTS DUE TO RESTRICTED DELIVERY NOZZLE AND RESTRICTION VALVE IN TOP WATER PIPE TO LE C 2675 THE RESTRICTED DELIVERY NOZZLE HAS REDUCED… | ||
| Scan218 | Graph showing water flow and suction side depression for the Phantom II cooling system. | ||
| View original record | PHANTOM II COOLING SYSTEM. 5 1/2 : 7 m/m MATRIX TUBES (19 Ex) WATER FLOW AND SUCTION SIDE DEPRESSION FOR VARYING TEMPERATURES AND WITH AND WITHOUT RESTRICTED DELIVERY NOZZLE. WATER FLOW THROUGH TOP… | ||
| Scan219 | Graph showing the effect of temperature and a restricted delivery nozzle on water flow versus engine RPM for a Phantom II cooling system. | ||
| View original record | PHANTOM II COOLING SYSTEM. EFFECT OF TEMPERATURE AND RESTRICTED DELIVERY NOZZLE ON WATER FLOW. 5 - 7 1/2 m/m MATRIX TUBES ON 19 EX. WATER FLOW THROUGH TOP WATER PIPE (GALLS/MIN) ENGINE R.P.M. LEGEND:… | ||
| Scan220 | Radiator corrosion and experiments with Ethylene Glycol as an anti-freezing compound in Phantom II cars. | ||
| View original record | x766. To C. From Hs/Bm. c. to Hm. Hs/Bm. 2/MJ. 25.2.30. V4576 V1435 x766 RADIATOR CORROSION. In a recent Depot Sheet we recommended Ethylene Glycol as an anti-freezing compound. Further experiments… | ||
| Scan221 | Request to fabricate a bottom water pipe with a thermometer adaptor for the Phantom 11 left-hand engine. | ||
| View original record | RHC. From Hs/Rn. 1766. Hs/Rn. 2/MJ.11.6.30. TEMPERATURE TESTS PHANTOM 11. We have handed to you a bottom water pipe from the Phantom 11 right-hand engine which is fitted with an adaptor for a… | ||
| Scan222 | Temperature tests at Brooklands detailing insufficient radiator cooling and petrol supply starvation issues. | ||
| View original record | To Hs/Rn. From F. Dodd. x766 HS/FD.1/MJ.11.6.30. x766. x788. BROOKLANDS. 4.6.30. Temperature tests of top and bottom water temperature, scuttle temp, oil temperature, and clutch pit temperature, were… | ||
| Scan223 | Acceleration tests comparing a standard carburetter with one fitted with an air silencer. | ||
| View original record | -2- Acceleration tests were taken with both air silencer and standard carburetters fitted. These show that the standard carburetter gives slightly better results. - Average figures Standard… | ||
| Scan224 | Steering tests conducted at Brooklands with different tyre types and pressures. | ||
| View original record | BROOKLANDS. STEERING TESTS. 4.6.30. Tests were carried out with Standard Dunlop Silent tyres, U.S.A. 7 x 19 Royal, and 7 x 20 1/2" off set special. U.S.A. 7 x 19. at 40 lbs. pressure. Steering… | ||
| Scan225 | Tyre performance and steering characteristics at various pressures and vehicle configurations. | ||
| View original record | 7 x 20 Dunlop Silent Tyres. At 40 lbs. - Steering very light at high speeds, not so positive as ½" off-set wheels. Good for joggles. At 35 lbs. - Steering not quite so light but joggles slightly… | ||
| Scan226 | Log sheet recording temperature and performance data during vehicle test laps under various conditions. | ||
| View original record | MEAN LAP TIME. AIR TEMP. TOP WATER TEMP. BOTTOM WATER TEMP. OIL TEMP. SCUTTLE TEMP. GEAR-BOX TEMP. OIL PRESSURE. M.P.H. CONDITION (1) A. C.O. OPEN. 2ND. TEST RUN. 78.18 | 18 | 86°C. | 169°F. | 100°C.… | ||
| Scan227 | Test report logging lap times, various temperatures, and oil pressure under different vehicle conditions. | ||
| View original record | MEAN LAP TIME. AIR TEMP. TOP WATER TEMP. BOTTOM WATER TEMP. OIL TEMP. SCUTTLE TEMP. GEAR-BOX TEMP. OIL PRESSURE. CONDITION (2) A. TEST. Owing to the cut-out having seized up and pressure for time this… | ||
| Scan228 | Request for a louvered bonnet and standard shutters for the 19-EX car for cooling tests at Brooklands. | ||
| View original record | RHC. From HS/Rn. _Handwritten: x766._ Hs/Rn.2/MJ.13.6.30. 19-EX. LOUVRED BONNET. _Handwritten: x766. x7260_ We are anxious to obtain a pair of louvred sides for the bonnet of 19-EX with a view to some… | ||
| Scan229 | Arrangement to purchase 100 tickets for the Brooklands Automobile Racing Club track. | ||
| View original record | x766. S/W. Hs...from PN. PN.2/WT17.6.30. We are making arrangements with Percy Bradley, of the Brooklands Automobile Racing Club whereby we buy a book of 100 tickets at 5/- each, enabling a car with… | ||
| Scan230 | Tickets and garage availability at Brooklands Motor Course. | ||
| View original record | x76 PN.3/WT23.6.30. S/W. Hs...from PN. Brooklands Motor Course. Further to my recent memo, I now have a book of 100 tickets available at any time. Each ticket will admit one motor-car with four… | ||
| Scan231 | Brooklands tests of the 19-EX car's cooling system, prompted by issues with the Phantom II model. | ||
| View original record | X766. To R. from Hs/Rm. c. Sg. Wor. c. Da. E. c. By. Rg. c. Lr. Hs/Rml/MJ25.6.30. X.788 X.766 X.7250 X.7260 X.7731 X.7772. BROOKLANDS TESTS JUNE 17th to 20th 1930. We took 19-EX car to Brooklands with… | ||
| Scan232 | Cooling system ventilation tests, comparing the effects of undershields and bonnet shutters on a Phantom II. | ||
| View original record | Hs/Rml/W25.6.30. contd. -2- it. Therefore, in order to establish a basis of comparison for all conditions, the car was driven at a constant speed of 62 M.P.H. round the track until the heat dissipated… | ||
| Scan233 | Engine cooling tests, focusing on the need for ventilated bonnets, radiator performance, and comparisons between different car models. | ||
| View original record | -3- We think that it is essential to fit ventilated bonnets to cars going to hot climates because the critical atmospheric temperatures at which the car will boil is certainly at least 10°C. lower… | ||
| Scan234 | Performance issues including overheating, fuel supply, and lap speeds during car testing. | ||
| View original record | HS/Rml/MJ25.6.30 contd. -4- reaches is rather excessive (Graph (4). We have recorded temperatures as high as 110°C. after a prolonged burst of speed on the track with atmospheric temperatures of only… | ||
| Scan235 | Test report on the performance of experimental cars, identifying reasons for inferior speed and the effects of bonnet ventilation. | ||
| View original record | -5- might be worth certification by the track authorities for sales propaganda. We traced the inferior performance of 18-EX to a tighter engine by allowing the cars to come to a standstill from 60… | ||
| Scan236 | Engine cooling system tests, including radiator temperature, water circulation, and the American Phantom II. | ||
| View original record | -6- the tests, and ascertained that it was subjected to the correct tension. We compared the radiator temperature in this condition with the fan belt tightened choc a bloc and were surprised to note a… | ||
| Scan237 | Summary of findings on bonnet ventilation, fan efficiency, and radiator design for the Phantom II. | ||
| View original record | -7- advance or fan, but we are confident that it will be up to standard on the present 10,000 miles test. SUMMARY. Bonnet Ventilation. Phantom II requires as much ventilation as we can give it, as the… | ||
| Scan238 | Need for ventilated and louvred bonnets for cars driven at high speeds on the Continent and in England. | ||
| View original record | Hs/Rm/MJ25.6.30 contd. -8- special motor roads, all encourage high speeds. We know of no big car used on the Continent that does not fit ventilated bonnets. Therefore, wal while we are better off for… | ||
| Scan239 | Graph showing water and oil temperatures plotted against miles run during a vehicle test. | ||
| View original record | GRAPH I TEMP C° 90° 80° 70° 60° MILES RUN TOP WATER OIL BOTTOM WATER 19 E.X. 14 x 52 AXLE. 62 M.P.H. 6 7/m 7 1/2 /m RAD. NO BONNET VENTILATION. Ats TEMP 24°C | ||
| Scan240 | Blank document page with a purple ink stamp in the bottom right corner. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT RMC. T. 2 JUL 1938 DERBY | ||
| Scan241 | Graph showing the ambient temperature at which a Standard PII Cabriolet will overheat under various ventilation conditions. | ||
| View original record | GRAPH II STANDARD PII CABRIOLET 19 EX. AXLE RATIO 14 x 52 WT 48 CWT EMPTY TEMP. AT WHICH CAR WILL OVER-HEAT EVENTUALLY (100°C - TOP WATER TEMP.) 10°C 20°C 30°C 40°C 50°C STANDARD NO VENTILATION 35°C… | ||
| Scan242 | Graph showing the effect of different cooling configurations on engine water temperature. | ||
| View original record | GRAPH III. Y-AXIS: 85°, 80°, 75°, 70°, 65° X-AXIS LABELS: STANDARD REAR BONNET SHUTTERS OPEN FRONT UNDERSHIELD OFF FRONT BONNET SHUTTERS OPEN ALL SHUTTERS OPEN LOUVRED BONNET LOUVRED BONNET FRONT FAN… | ||
| Scan243 | Graph plotting oil and water temperatures against miles run under varying speed and ventilation conditions. | ||
| View original record | GRAPH IV 62 M.P.H. C.O. CLOSED ATS TEMP 20°C CAR OPENED FULL OUT C.O. OPEN 83 M.P.H. OIL TEMP TOP WATER VENTILATED UNDERSHIELD ALL BONNET SHUTTERS OPEN TEMP C° MILES RUN 100° 90° 80° 70° 25 30 35 | ||
| Scan244 | Bar chart comparing critical air temperatures for spring tensioned versus positively tensioned fan belts. | ||
| View original record | 19 E.X. 62 M.P.H. No BONNET VENTILATION GRAPH V. COMPARISON OF SPRING TENSIONED FAN AND FAN BELT TENSIONED POSITIVELY. CRITICAL AIR TEMP 10°C 20°C 30°C 40°C SPRING TENSIONED 40.5 BELT TIGHTENED CHOC à… | ||
| Scan245 | Graph comparing the top water temperature of two engine models, 19 EX and 18 EX, over a test run. | ||
| View original record | GRAPH VI. TOP WATER TEMP C° 100 90 80 70 60 MILES RUN. 2.5 5 7.5 10 12.5 15 17.5 20 22.5 OPENED UP TO FULL THROTTLE. 18 EX. 19 EX. COMPARISON OF 19 E.X. AND 18 E.X. 6 7/8 m/m 7 1/2 m/m RAD. 62 M.P.H.… | ||
| Scan246 | Blueprint showing a modification to the front undershield to improve the cooling system. | ||
| View original record | MODIFICATION TO IMPROVE COOLING SYSTEM. CUT AWAY FRONT UNDERSHIELD STANDARD FRONT UNDERSHIELD | ||
| Scan247 | Blank document page with a purple ink stamp in the bottom right corner. | ||
| View original record | ROLLS-ROY... ...NTER PRINT ROOM, 2 JUL 1930 DEPT | ||
| Scan248 | Summary of circulation figures for the Phantom II engine, detailing performance under various conditions and tests. | ||
| View original record | FOR FILES. x766. Rm.1.7.30. x766 17250. CIRCULATION FIGURES PHANTOM 11. CURVE 1. - shewes the various errors which are likely to occur if the venturi is incorrectly fitted up. CURVE 11.- shews that at… | ||
| Scan249 | Two graphs comparing engine coolant flow rates in Gallons/Min against Engine RPM for different system configurations. | ||
| View original record | GRAPH 1: RAD E7935/6/4 L.H. ENGINE USED Y-Axis: FLOW GAL/MIN X-Axis: ENGINE R.P.M. A. VENTURI IN TOP DELIVERY PIPE B. SUCTION SIDE C. AND WRONG WAY ROUND SHEWING ERRORS IN MEASURING UNLESS VENTURI… | ||
| Scan250 | Blank page with a Print Room stamp. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM, 1 JUL 1930 DERBY. | ||
| Scan251 | Two graphs comparing left and right-hand engine delivery, and venturi readings versus actual measurements. | ||
| View original record | 3 COMPARISON OF L.H. AND R.H. ENGINES DELIVERY DELIVERY GAL/MIN L.H. ENGINE R.H. ENGINE ENGINE R.P.M. 4 COMPARISON OF VENTURI AND ACTUAL MEASUREMENTS OF QUANTITY VENTURI READING BY FORMULA 8√H USED IN… | ||
| Scan252 | Water circulation test results comparing pump delivery against water temperature for different radiator configurations. | ||
| View original record | WATER CIRCULATION TESTS PII Graph 5: PUMP DELIVERY GAL/MIN RAD E79321 BOTH SUCTION OUTLETS UTILISED 1st L.H. CHASSIS RAD WITH TOP FEED E77675 2500 ENGINE R.P.M. BOTTOM WATER TEMP C° Diagrams: RAD… | ||
| Scan253 | Otherwise blank document page with a receiving stamp from the Derby office. | ||
| View original record | J.C. LIMITED ROOM, 1 JUL 1930 DERBY. | ||
| Scan254 | Recommendations to resolve a customer's overheating issue by adjusting the fan and fan belt. | ||
| View original record | c lo By. X766 Hm. From Hs/Rn. HS/Rn.3/MJ.1.7.30. With reference to Whr2/D27.6.30. attached. As this man used his car in Switzerland it is clear that his overheating takes place when climbing at… | ||
| Scan255 | Page discussing the effect of fan position on over-heating. | ||
| View original record | -2- effect of fan position on over-heating in the next week or so. Hs/Rm. | ||
| Scan256 | Letter addressing a car's overheating problem and suggesting potential solutions. | ||
| View original record | G.W. Hancock, Esq., Hotel De France, Chateauroux, Indre, FRANCE. x766 x7773 To GWH. From Hs/Rm. Hs/Rm.2/MAJ.7.7.30. With reference to your Daily Report of the 5th.inst. We are concerned about the… | ||
| Scan257 | Proposal for conducting comparative overheating tests against other car makes, including a Maybach and American models, at Brooklands Track. | ||
| View original record | To R. From Hs. c. to SS. WOP. c. to E. Da. c. to HY. No. S/MJ. 8.7.30. x766 x3531 COMPARATIVE OVERHEATING TESTS WITH OTHER MAKES OF CARS. -------------------- We will endeavour to get hold of some of… | ||
| Scan258 | Second report on Brooklands radiator tests, detailing issues with the fuel supply and autovac system. | ||
| View original record | X766 To R. from Hs/Rm. c. Sg. Wor. c. Da. E. c. Ev. Rg. c. Lr. Hs/Rml/MJ9.7.30. X.788 X.766 X.7250 X.7260 X.7220 X.7771 X.7510 X.7772 BROOKLANDS RADIATOR TESTS. SECOND REPORT. We carried out a further… | ||
| Scan259 | Carburetter air intake temperatures and their effect on fuel supply efficiency and overheating. | ||
| View original record | -2- Hs/Rml/MJ9.7.30 contd. temperature of the air intake to the carburetter. With an atmospheric temperature of 24°C. the air intake reached 50°C. at 75 M.P.H. As soon as the car was stopped this… | ||
| Scan260 | The performance of the cooling system fan and issues with mixture strength at high speeds. | ||
| View original record | -3- by such leaks in service has been brought to our notice. COOLING SYSTEM - FAN - We confirmed our previous result that the standard spring loaded whittle belt is incapable of driving the fan… | ||
| Scan261 | Resolving pre-ignition and over-heating, comparing radiator matrixes and bottom outlets. | ||
| View original record | -4- Hs/Rml/MJ9.7.30 contd. pre-ignition and over-heating. The simplest way of overcoming this is to run on the reserve. This trebles the period of full throttle work before shortage takes place. The… | ||
| Scan262 | Engine cooling system circulation and water temperature tests at speed. | ||
| View original record | Hs/Rm1/MJ9.7.30 contd. -5- CIRCULATION. We conducted tests on the track restricting the circulation until the system lost efficiency to the extent of about 2°C. top water temperature. The flow under… | ||
| Scan263 | Vehicle overheating, discussing factors such as fan efficiency, ambient temperature, and the cooling system's performance. | ||
| View original record | -6- Hs/Rml/MJ9.7.30 contd. efficient fan, a rich mixture and a ventilated bonnet the car should not over-heat at air temperatures below 35°C. when driven all out continuously in still air, and if… | ||
| Scan264 | Recommendations for improvements to the fan belt, autovac, and cooling system, with test proposals for the Phantom II. | ||
| View original record | -7- Hs/Rm1/U9.7.30 contd. Our recommendations for improvement are - (1) Improved fan belt. Standardisation sheet circulated. We are so dependent on this that we think the drive might receive design… | ||
| Scan265 | Graph and bar chart analysing the performance of a vehicle's cooling system under various fan, speed, and ventilation conditions. | ||
| View original record | GRAPH I A. TEMPERATURE C° 85° 80° 75° 70° 65° NO FAN STANDARD SPRING TENSIONED WHITTLE BELT WHITTLE BELT TIGHTENED CHOC A BLOC. BELT CHOC A BLOC AND FAN 1" NEARER RAD. TOP WATER TEMP. BOTTOM WATER… | ||
| Scan266 | Blank document page with a Derby date stamp. | ||
| View original record | 12 JUL 1930 DERBY. | ||
| Scan267 | Blueprint with graphs detailing the effect of water circulation on overheating in a PII water system for a 19 Ex. car. | ||
| View original record | GRAPH II EFFECT OF CIRCULATION ON OVERHEATING CIRCULATION ON PII WATER SYSTEM A 19 Ex. CAR A BACK PRESS CAUSED BY RESTRICTION 15 LBS/SQ.IN. WATER OUTLET FROM THE CYL. BLOCK RESTRICTED TO 23-.125… | ||
| Scan268 | Line graph plotting top and bottom water temperatures against seven different test configurations for a car at Brooklands. | ||
| View original record | GRAPH III TEMPERATURE C° (1) FULL WEAK NO FAN. (2) AS (1) BUT MIXTURE NORMAL NO FAN. (3) AS (2) BUT FAN SPRING LOADED (4) AS (3) BUT FAN BELT CHOC À BLOC. (5) AS (4) BUT FAN 1" NEARER RAD. (6) AS (5)… | ||
| Scan269 | Graph showing the effect of bottom water temperature on complete car circulation and pump suction depression at a constant engine speed. | ||
| View original record | GRAPH IV EFFECT OF TEMP. ON COMPLETE CAR CIRCULATION. RADIATOR E. 79951 CIRCULATION GAL/MIN BOTTOM WATER TEMP C° DEPRESSION SUCTION SIDE OF PUMP INS. HG. FLOW GAL/MIN DEPRESSION ON SUCTION SIDE OF THE… | ||
| Scan270 | The reverse side of a document, marked with a 'Print Room' date stamp. | ||
| View original record | The main body of text is too faint and illegible to be transcribed. The purple ink stamp reads: ROLLS-ROYCE, LIMITED, PRINT ROOM, 12 JUL 1930 | ||
| Scan271 | Phantom cooling tests at Brooklands, considering radiator modifications and comparing performance with other cars. | ||
| View original record | Hs. from R. c. Sg. Wor. c. EV. C. X766 R2/M.7.30. BROOKLANDS TESTS. PHANTOM COOLING. X. 788 X. 766 X. 3531. Referring to hs/Rml/MJ25.6.30. we should like to know how our cooling compares with that of… | ||
| Scan272 | Potential modifications for increased cooling for the 25 HP and 45 HP models. | ||
| View original record | X766 Hs. from R. c. Sg. Wor. c. By. C. RI/M4.7.30. X.766 X.1085 X.7250 X.5250 25 HP. & 45 HP. MODIFICATIONS FOR INCREASED COOLING. I do not like the idea of cutting away the front apron because of the… | ||
| Scan273 | Engine cooling issues, fan performance tests at Brooklands, and proposed fan belt redesigns. | ||
| View original record | G. W. Hancock, Esq., Hotel de France, Chateauroux, Indre, FRANCE. x766 x766 x7220 To GWH. From Hs/Rn. Hs/Rn.3/MJ.9.7.30. We are in receipt of your note of the 7th.inst., and note your remarks re the… | ||
| Scan274 | Car cooling system performance, temperature readings, and requests for further testing. | ||
| View original record | -2- Hs/Bl.3/Ll.9.7.30.Contd. We want you to be very careful to [handwritten: make it clear] how maximum temperatures which you record in your Daily Reports are obtained. We note in the Daily Report… | ||
| Scan275 | Typed letter discussing car overheating, brake linings, and cooling system performance. | ||
| View original record | -3- Hs/Rm.3/ML.9.7.30.Contd. We should like you to make sure that the ignition setting is the best for the cool running of the car. We presume that during your trouble with the valve taking up its… | ||
| Scan276 | Typed memo discussing atmospheric temperatures and centre point lubrication. | ||
| View original record | -4- Hs/an.3/ML.9.7.30.Contd. atmospheric temperatures from 15º to 30ºC. it would be very valuable information. We note your remarks re the centre point lubrication. Hs/Rn. | ||
| Scan277 | Results and future plans for cooling tests on 25 HP and 40/50 HP engines, including the Phantom II. | ||
| View original record | X766 To R. from Hs/Rm. c. Sg. c. Wor. c. Ev. C. Hs/Rml/ADLO.7.30. X.788 X.766 X.7250 X.5250 X.7260. COOLING TESTS 25 H.P. and 40/50 HP. With reference to R2/M1.7.30. R1/M4.7.30. You will see from our… | ||
| Scan278 | Testing a square tube radiator and arranging on-track comparisons with other vehicles. | ||
| View original record | Hs/Rm1/AMO.7.30 contd. The square tube radiator will be run on our next test. We think comparison with other cars would be invaluable, but to be of any use they will have to be carried out on the… | ||
| Scan279 | Schedule of radiator tests for car 19-EX at Brooklands. | ||
| View original record | G. Radcliffe. From Hs/Rn. x766. Hs/Rn.9/MJ.10.7.30. x788. RADIATOR TESTS. We want you to prepare to make the following tests on 19-EX. car on Brooklands, Monday next. 75 M.P.H. Standard, all closed.… | ||
| Scan280 | Optimal size of radiator tubes for engine cooling and carburetter performance. | ||
| View original record | Hs. from R. c. Sg. c. Wor. By. R1/M14.7.30. X766 X.7250 X.766 X.7260 RE - CAR WORK. It appears from your memo. Hs/Rml/MJ9.7.30. that you have tested smaller radiator tubes than the 6 mm. standard. I… | ||
| Scan281 | Recurring water loss and high temperature issues during a 10,000-mile test of car 24-EX in France. | ||
| View original record | S/W. to Hs. From Sg. c. to Wor. COPY. x766. Sg.2/D17.7.30. X.7250. X.766. X.7941d. Re. 10,000 Miles Test of 24-EX. in France. It has been made clear in the 10,000 mile reports that apart from the… | ||
| Scan282 | Third report on Brooklands tests comparing the cooling of the Phantom II against other cars. | ||
| View original record | To H. From Hs/sn. c. to Ag. WOR. c. to Da. E. c. to EV. GY. c. to Rg. BROOKLANDS TESTS - THIRD REPORT. Attached is a resume of test made comparing the cooling of Phantom ll with various other cars. In… | ||
| Scan283 | Test report on a 5-passenger closed sedan detailing its cooling, speedometer, acceleration, and a subsequent engine failure. | ||
| View original record | MARMON S. 78. 5. Pass. Closed Sedan. COOLING. - This car had done about 375 miles when taken over. As will be observed from the attached details of the cooling system the radiator has a large frontal… | ||
| Scan284 | Test report page detailing performance issues of a vehicle's engine, suspension, steering, and brakes. | ||
| View original record | MAYFAIR S. 7S. -2- He/En.2/AL.22.7.30.Contd. ENGINE. - The engine was remarkably free from torque reaction and in consequence one was very liable to under estimate its powers of acceleration. There… | ||
| Scan285 | Performance and comparison report on a Pierce Arrow 6-cylinder sedan. | ||
| View original record | PIERCE ARROW. ======== This car was one of the latest 6 cylinder models. It was a seven seater Sedan, weighing 5,300 lbs. ready for the road. It had covered 900 miles. COOLING. - The standard test at… | ||
| Scan286 | Performance and handling review of a Pierce-Arrow car, continuing from a previous page. | ||
| View original record | -2- PIERCE ARROW CONTD. STEERING.- Good as far as the suspension of the car allows. GEARBOX. - An excellent silent third, reasonably easy change even from 2nd. to 3rd. BRAKES. - Quite good. CLUTCH -… | ||
| Scan287 | The cooling performance tests of a 1927 Hispano-Suiza Coupe, comparing it to a Phantom II. | ||
| View original record | HISPANO SUIZA. This car was a 1927 Coupe. As we have had a similar car at the works its general characteristics are too well known to require comment. We therefore only obtained information as to its… | ||
| Scan288 | Performance comparison report between a Hispano-Suiza car and a Rolls-Royce Phantom II, focusing on radiator/fan efficiency and acceleration. | ||
| View original record | -2- HISPANO SUIZA CONTD. The radiator was appreciably less efficient owing to three years service. We took the usual precautions to ensure that the fan was working properly etc. On the whole, since… | ||
| Scan289 | Technical report on the testing and comparison of a 6-cylinder Graham Paige car. | ||
| View original record | GRAHAM PAIGE. We tried the largest of the 6 Cylinder Graham Paiges fitted with a Weymann Saloon body weighing 4124 lbs. complete with one spare wheel, petrol, oil, and water. The car is taxed £30,… | ||
| Scan290 | Performance and engine smoothness analysis of a Graham Paige car, with comparisons to other contemporary vehicles. | ||
| View original record | -2- GRAHAM PAIGE CONTD. He/RL.S./M.J. 22.7.30. The maximum lap speed of 71.66 M.P.H. is excellent and is made possible by the silent third which allows a top gear ratio of 3.643 - 1. The acceleration,… | ||
| Scan291 | Page 3 of a comparative analysis of a Graham-Paige car's mechanical components. | ||
| View original record | -3- GRAHAM PAIGE CONTD. Hs/Rn.2/MJ. 22.1.32. would deter people making full use of the gear. Nevertheless it is a big advance on standard practice. STEERING. - The steering of this car is typically… | ||
| Scan292 | Summary of comparative tests on engine cooling, comparing ventilated bonnets against Hispano-Suiza and American cars. | ||
| View original record | SUMMARY. Our comparative tests have proved that, with a ventilated bonnet, we are at least as well cooled as the best car we know of, the HISPANO SUIZA, and considerably better cooled than the average… | ||
| Scan293 | Comparison of engine performance and other features against a Graham Paige car. | ||
| View original record | -2- SUMMARY. Hs/RL.2/SL.22.7.30. from the "pinking" they are all using considerably higher compression ratios than we are, but there is no sign of increased engine roughness. Their silent thirds are… | ||
| Scan294 | Comparative table of specifications and performance data for various car models. | ||
| View original record | CAR, TYPE | BORE. STROKE DISPLACEMENT CAR WT. TOTAL | EFFECTIVE TYRE. CIRCUM. 50 Lbs/□" | DIRECT DRIVE RATIO | TYPE OF MATRIX. | TOP WATER TEMP. AT 60 M.P.H. ATS. TEMP 20°C VENTILATED BONNET. | MAX.… | ||
| Scan295 | Blank document page with a 'Print Room' date stamp from Derby. | ||
| View original record | ROLLS-ROYCE, LTD. PRINT ROOM 23 JUL 1930 DERBY. | ||
| Scan296 | Extract from a report regarding a chart of water and air temperatures taken during a 250-mile car run. | ||
| View original record | x766 x7941d No.6/AL.23.7.30. R. From Hs. c. to Ag. Bor. c. to R. Da. c. to Ey. 24-XX The following paragraph is contained in Hancock's report of 20.7.30. -> Re. Temperatures varying with speed and air… | ||
| Scan297 | Graph of water and air temperature readings taken every 50 miles over several days. | ||
| View original record | 24:- Ex. WATER & Air TEMPERATURE READINGS EVERY 50 MILES. 13-7-30 14-7-30 15-7-30 16-7-30 MORNING SHIFT AFTERNOON SHIFT. MORNING SHIFT. MORNING SHIFT. AFTERNOON SHIFT MORNING SHIFT. TOP WATER… | ||
| Scan298 | Blank page with a date stamp in the bottom right corner. | ||
| View original record | LIMITED 23 JUL 1930 | ||
| Scan299 | Radiator tests on the Montlhery Track with car 24-EX, confirming results from Brooklands. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to HY. X 766. Hs.8/MJ.23.7.30. x766 x788. RADIATOR TESTS. G.W.Hancock has carried out tests on the Montlhery Track near Paris with 24-EX. These tests… | ||
| Scan300 | Schedule of 18 performance and cooling system tests conducted on the Montlhery track. | ||
| View original record | 24-EX. - 17.7.30. Tests taken on Montlhery track. All temp. readings taken at the completion of lap, and same position of lap. ROTATION OF TESTS. (1) Tests for loss of water. Temp. 75° to start off.… | ||
| Scan301 | Series of tests measuring water loss and temperatures at various speeds and conditions. | ||
| View original record | 18.7.30. Tests for loss of water, temp. 75° to start, maximum speed, time, temperatures. Maximum speed of car complete with 4 people up :- Distance round track 2.548 m. 24. Time :: 73 2/3 secs = 124,… | ||
| Scan302 | Engine temperature test results under various bonnet shutter and ignition settings. | ||
| View original record | -2- 5° Test with front bonnet shutters open, 70 M.P.H. Top water Temp. Bottom water Temp. Oil Temp. Air Temp. 87.5 80 90 19. 85 76 90 18.5 ) Note 80 71 90 18.5 ) result 79.5 72.5 88 18.5 ) of rain… | ||
| Scan303 | Series of cooling system performance tests measuring water, oil, and air temperatures under various conditions. | ||
| View original record | -3- 9º Standard test at 60 M.P.H. with all bonnet shutters open. Top water Temp. Bottom water Temp. Oil Temp. Air Temp. 81. 74.5 78 18 81 75 78 18 81 75 79 18 10º Fan belt slacked off with all bonnet… | ||
| Scan304 | Page of test results measuring water, oil, and air temperatures under various conditions, including different fuel mixtures and ignition settings. | ||
| View original record | -4- 15° Test double supply from bottom tank to water pump. Checked up against No.9 and 14 tests. Top water Temp. Bottom water Temp. Oil Temp. Air Temp. Water Lost. 84.5 78 77.5 19.5 84.5 78.5 79 19.5… | ||
| Scan305 | Procedure for diagnosing and rectifying complaints of overheating cooling water. | ||
| View original record | Hd. From Hs/Rn. For Depot Sheet. c. to Hm. Paris x766. Hs/Rn.1/MJ.1.8.30. x766 x7250. x5250. OVERHEATING OF COOLING WATER. ----------------------------- Every year, in hot weather, a number of… | ||
| Scan306 | Page from a service manual detailing cooling system checks and maintenance, focusing on the water pump and fan. | ||
| View original record | -2- Hs/Ru.1/M.J.1.3.30.Contd. fitted with 6 m/m. 7 m/m. tubes should always be suspected as potential sources of trouble. The matrix should be cleaned externally from Bees, Butterflies, etc. (D)… | ||
| Scan307 | Factors affecting engine overheating, such as bonnet ventilation, fuel mixture strength, and the use of a cut-out. | ||
| View original record | -3- (2) BONNET VENTILATION. - The two (or in some cases, four) bonnet shutters provided, drop the top water temperature some 3°C. when open at speed. They also keep the driver's feet cooler. Clearly… | ||
| Scan308 | Guidance on vehicle overheating, radiator shutters, and the function of the red warning light. | ||
| View original record | -4- Hs/Rm.1/W.1.8.30.Contd. with a louvred bonnet should be free from over-heating up to an atmospheric temperature of 30°C. and if trouble occurs at a temperature below this the car is not up to… | ||
| Scan309 | Customer overheating complaints and proposing a faster, double-pulley fan drive to improve cooling. | ||
| View original record | x 766. To Ev. from Hs/Rm. HS/RM/AD1.3.3.30. x766 x7220 x196. 40/50 FAN. On our recent cooling tests we have proved that the greatest factor in keeping the car cool is the fan. The new canvas rubber… | ||
| Scan310 | The cooling performance of the Phantom II compared to competitor cars during the Fifth Brooklands Report. | ||
| View original record | To R. From Hs/Rm. c. to SS. Wor. c. to Da. E. c. to By. RG. Hs/Rm.7/MJ.25.8.30. X.788. X.4012. X.766. X.1692. X.7771. X.4588. X.5771. X.3531. FIFTH BROOKLANDS REPORT. We have now completed the… | ||
| Scan311 | Comparison of cooling system specifications and performance against competing car models. | ||
| View original record | -2- Hs/Rm.7/WJ.25.8.30.Contd. were not the bonnet louvres the only means of escape for the air. The results indicate that we are well up in the dimensions of our cooling system compared with other… | ||
| Scan312 | Performance comparison report on 25 HP and 20 HP models, including maximum speed test data. | ||
| View original record | -3- Hs/Rm.7/MJ.25.8.30.Contd. reached on this gear in comfort. We think that the Graham Paige have cleverly exploited the obsolete R.A.C. rating formula and will get a good reputation when compared… | ||
| Scan313 | Page discussing gains from a 112º camshaft and higher compression. | ||
| View original record | -4- Hs/Rm.7/Al.25.8.30. Contd. gain due to the 112º camshaft and higher compression. | ||
| Scan314 | Comparison of Face Area, Volume, and Temperature data for various car models. | ||
| View original record | TABLE 1: CAR. | Face Area per 1000 litre disp. per mile. ROLLS-ROYCE 25 HP. | 83.0 sq.ins. CHRYSLER 75. | 82.7 sq.ins. HISPANO | 77.2 sq.ins. ROLLS-ROYCE 40/50. | 71.2 sq.ins. GRAHAM PAIGE | 65.2… | ||
| Scan315 | Blueprint with two graphs comparing acceleration figures and speedometer calibrations for different cars. | ||
| View original record | Left Graph Title: COMPARATIVE ACCELERATION FIGURES Y-axis: ACCELERATION FT/SEC^2 X-axis: ROAD SPEED M.P.H. Data Lines: GRAHAM PAIGE SILENT THIRD, GRAHAM PAIGE TOP, G.W.H. FIGURES 24 EX. 6000 MILES,… | ||
| Scan316 | Comparative data table of various cars, focusing on cooling system specifications and performance metrics. | ||
| View original record | TABLE COLUMNS: TYPE OF CAR, DISPLACEMENT, TYPE OF BODY, WT OF COMPLETE CAR AS TESTED. DIMENSION OF MATRIX, WATER CAPACITY OF SYSTEM. TYPE OF TOP MATRIX TANK DIMENSIONS. FAN AND DRIVE. DIRECT DRIVE… | ||
| Scan317 | Insufficient cooling on the Phantom II model and the inefficiency of its bonnet ventilators. | ||
| View original record | Hs X766. X766 X1085 X7260 To Hs. from Sg. Copy to Wor. C. P.II. Cooling. Sg24/E1.9.30 You will remember that ever since I came back from America I have been expressing views to the effect that I… | ||
| Scan318 | Explanation of the Phantom II's cooling system design, framed as a response to a customer's overheating complaint. | ||
| View original record | To Sg. from Hs/Rn. c. MOT. C. c. FN. H. EP. c. Mx. Hd. By. OVERHEATING - PHANTOM II. We suggest that the following information might be given to a customer who complained that his car overheated. The… | ||
| Scan319 | Instructions regarding the red warning lamp, cooling system boiling, and bonnet ventilation for different climates. | ||
| View original record | -2- Lis/3rd/AD3.9.30. contd. (1) The red lamp which is fitted to the instrument board is put there to prevent the driver forgetting to open his radiator shutters. When the red lamp lights it does not… | ||
| Scan320 | Instructions regarding the engine's red warning lamp and driving on Continental roads. | ||
| View original record | HS/RML/AD2.9.30 contd. -3- (3) On Continental roads, benefit can be derived from running with the cut-out open. The main point to bear in mind is that the periodic lighting of the red lamp in… | ||
| Scan321 | Retention of shutters on the Phantom 11 to aid cooling and address issues with excessive petrol heat. | ||
| View original record | X766 To Sg. From Hs. c. to Wor. c. to C. Hs.5/W.J.9.9.30. X766 X/085 X7=60 PHANTOM 11 COOLING. Re. Sg24/E1.9.30. It was all arranged on the Experimental Dept's recommendation that the front shutters… | ||
| Scan322 | Deletion and painting process of bonnet shutters. | ||
| View original record | COPY. To Hs. From R. c. to BJ. BY. BONNET SHUTTERS. We understand it is agreed to delete the back shutters. Da. will provide a less expensive scheme: the original one was made when we could afford… | ||
| Scan323 | Design changes for the 40/50 HP car bonnets. | ||
| View original record | COPY. To C. From BJ. c. to Sz. c. to Wor. c. to R. c. to Sy. c. to Ms. 40/50 H.P. BONNETS. Confirming a conversation I had with R. yesterday, it was decided: a. That there shall only be one shutter… | ||
| Scan324 | Removal of rear shutters on cars not intended for tropical climates. | ||
| View original record | COPY. to BJ. From Hs. c. to R. HS6/LG30.6.31. With reference to BJ16/E27.6.27. We think that there should be no objection to deleting the rear shutters on the present standard car not intended for… | ||
| Scan325 | Phantom II overheating issues and proposing three modifications. | ||
| View original record | To Hs. from Sg. Overheating - Phantom II. I have read with interest the contents of Hs/Rm1/AD2.9.30 and I think there is a good deal of information contained therein which will be of value to… | ||
| Scan326 | Overheating tests on the Phantom II, specifically investigating the modification of undershields. | ||
| View original record | To Sg. From Hs. c. to Wor. c. to C c. to PN. c. to H. c. to Mx. c. to EP. c. to Hd. c. to By. 8766 Hs.4/MJ.8.9.30. OVERHEATING - PHANTOM II. X.766. X.3875. X.1085. X.7220. X.196. Replying to… | ||
| Scan327 | Cooling performance issues and radiator modifications for the Phantom II car. | ||
| View original record | To R. From Hs. c. to SE. Wor. c. to M. Da. c. to HY. 8766 Hs. 2/MJ. 9. 9. 30. x766 x7250. PHANTOM - COOLING. Recent tests which have been carried out show the Phantom ll cooling is not now as good as… | ||
| Scan328 | Concluding page of a comparison with the Phantom 11, stating a full report is in preparation. | ||
| View original record | -2- Hs.2/M.L.R.B.30.Contd. compared with the original Phantom 11. This is briefly the position, a complete report is being prepared. Hw. | ||
| Scan329 | Phantom II radiator cooling issues and a design change causing higher operating temperatures. | ||
| View original record | COPY. X766. To Hs. From Sg. c. to Wor. E. c. to Da. BY. re. Phantom - cooling. Sg9/E16.9.30. X.766. X.7250. In your Hs.2/MJ.9.9.30. you mentioned that soon after we had despatched a few Phantom ll… | ||
| Scan330 | Radiator cooling issues on Phantom I & II models and the move to a more efficient square tube design. | ||
| View original record | To Ag. From Hs. c. to Cor. c. to C. c. to De. c. to My. X766. Hs.1/M.18.9.30. x766 x7050 re. Phantom - Cooling. Replying to Sga/M16.9.30. It is correct that the serious troubles with stopped up… | ||
| Scan331 | Report comparing the efficiency of different radiator matrix types for the Phantom II model. | ||
| View original record | To R. From Hs/An. c. to Ag. Hor. c. to Z. Da. c. to WY. x766. No/Rs.1/AJ.24.9.30. x7250 x766. PHANTOM II COOLING - RADIATORS. In Hs/An.2/ADEL.&.30 we gave figures comparing this square tube radiator… | ||
| Scan332 | The efficiency of direct versus indirect radiator cooling systems with an accompanying graph. | ||
| View original record | -2- Hs/Hn.1/Wl.24.9.30.Contd. of 150 miles per hour. These results rather confirm what we have been thinking recently, that is that for low air velocities through the core, indirect cooling surface is… | ||
| Scan333 | Radiator efficiency, cooling performance, and an analysis of different radiator tube sizes. | ||
| View original record | -3- we dissipate about 19¾ H.P. per sq. foot of frontal area /100°F. difference in temperature between the mean radiator temperature and the atmospheric temperature, which corresponds to the figure… | ||
| Scan334 | Comparison of radiator tube designs, including round, square, and hexagon shapes, for efficiency and surface area. | ||
| View original record | -4- Again, from surface, free air area, and direct cooling we should expect the square tube radiator to equal the S/Hm,m. radiator in efficiency. The results show, however, that the round tube, which… | ||
| Scan335 | Technical report discussing radiator tube thickness, engine temperatures, and conclusions for future radiator tests. | ||
| View original record | -5- Hs/An.1/JL.24.9.30.Contd. It would seem reasonable that when we use tubes that are not expanded at the ends, the thickness might be slightly reduced. A reduction of .002 in the thickness of the… | ||
| Scan336 | Analysis of the Chrysler radiator's design, noting its fine air passages and difficulty in cleaning. | ||
| View original record | -6- He/Bn.1/ML.24.9.30.Contd. of our car speed range. We believe that the success of the Chrysler radiator is due to the considerable percentage of indirect cooling and large area of surface obtained… | ||
| Scan337 | Comparative table of radiator tube specifications and performance data. | ||
| View original record | DESCRIPTION OF RADIATOR TUBE. NO. OF TUBES SURFACE OF TUBES IN CONTACT WITH AIR. SQ. FT. FREE AIR AREA RADIATOR TUBES. SQ. INS. % FREE AIR AREA RADIATOR. % DIRECT COOLING. SQ. FT. SURFACE PER SQ. FT.… | ||
| Scan338 | Graph comparing the performance of three different types of radiator cores for slow-speed cooling. | ||
| View original record | TYPES OF RADIATOR CORE FOR SLOW SPEED COOLING 'C' .078 .250 ZIG ZAG RIBBON WITH INDIRECT COOLING 'B' .405 'A' TUBES .250 DIA EXPANDED TO HEXAGON ENDS Y-Axis: H.P. DIS. PER SQ. FT FRONTAL AREA. PER… | ||
| Scan339 | Blank page with a 'Print Room' stamp. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM. 24 SEP 1930 DERBY | ||
| Scan340 | Drawing and testing specifications for a square matrix tube. | ||
| View original record | Drawing Number: E 58239 Top Box: TUBES TO BE PROVED AS BY THE SUPPLIERS AGAINST SEASON CRACKING ONLY. Diagram Text: LENGTH OF TUBING, .300, .050, 4.000 +/- .010, .375, .0625 RAD. Main Text Block: EACH… | ||
| Scan341 | Blank page with a purple ink stamp from the Print Room in Derby. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM, 25 SEP 1930 DERBY. | ||
| Scan342 | Improvements to the P.2 & 25HP car cooling system, including a new radiator design. | ||
| View original record | HS/RM. FROM R. X766 R2/M29.9.30. C. to - SG. C. to - WOR. C. to - By. CAR WORK. P.2. & 25HP. COOLING. X.766 X.7250 X.5250 Referring to HS/RM1/MJ 24930., I am very pleased to hear that you agree with… | ||
| Scan343 | The development of a new square tube radiator and testing of louvres. | ||
| View original record | RECEIVED SEP 30 1930 RECEIVED 30 SEP 1930 P. DEPT y 766. BY10/G.30.9.30 R. c. Sgr. c. Nor. c. Hs. H- RADIATORS. ----------- Referring to R2/M29.9.30. we are holding 2/3rds. of the material in N.2… | ||
| Scan344 | Proposed modifications to the vehicle cooling system, including the radiator and bonnet louvres. | ||
| View original record | X966 HS. FROM R. R4/M1.10.30. C. to SG. WOR. BY. C. to E. DA. C. P. 2. COOLING. X.7260. X.766. X.7250. X.1085. We were very pleased to see that some of the features we have suggested have been made,… | ||
| Scan345 | Brief report on inconsistent test results for a square tube radiator being tested at Brooklands. | ||
| View original record | X966. To R. From Hs. c.c. to SS. Wor. c.c. to E. Da. c.c. to Ey. ================== Hs.1/MJ.7.10.30. ================== X.7250. X.788. X.766. SQUARE TUBE RADIATOR. ------------------- Tests were… | ||
| Scan346 | Requesting a repeat comparison test between a 6 m.m. parallel square tube radiator and a standard 6/7½ non-dented tube radiator. | ||
| View original record | x766. Mr. G. Ratcliffe, Blue Anchor Hotel, Byfleet, SURREY. X. 7250. X. 766. From Hs/Rn. Hs/Rn.3/MJ. 8.10.30. Thank you for your results. When you have finished the tests on the five radiators, after… | ||
| Scan347 | Overheating complaints on 20 Hp. cars and the results of tests on a Phantom II to assess the cooling effect of a louvered bonnet. | ||
| View original record | Hd. From Hs/Rn. For Depot sheet. X766. Hs/Rn.6/MJ.8.10.30. X.766. X.5260. We understand that there have been one or two complaints on 20 Hp. cars of overheating when hill climbing. In order to… | ||
| Scan348 | Car overheating issues, referencing customer feedback and experiments with square tubed Gallay radiators. | ||
| View original record | Handwritten notes: Hs, D1456, X766., X766, X7-2-0. To Hs. from Sg. re Overheating. Sg11/E13.10.30 Copy to Wor I have been reading with interest Hs/Rm.3/MJ.7.10.30 relative to cars seen and tried by… | ||
| Scan349 | Sixth Brooklands report on a series of tests on six different types of radiator core. | ||
| View original record | To R. from Hs/an. c. HS. c. WGT. E. c. Da. HV. x766. Hs/Rml/ADL4.10.30. x750. x766. x788. SIXTH BROOKLANDS REPORT. We have now completed a series of tests on six different types of radiator core. We… | ||
| Scan350 | Radiator tube tests, comparing square, parallel, and turbulent air flow designs. | ||
| View original record | HS/AM/AM4.10.30 contd. -2- confirming the figures in this test as though they are comparative we suspect that the car's performance was not 100%. We had hoped for over 10° improvement from this square… | ||
| Scan351 | Technical comparison of different radiator tubes and a Gallay radiator core. | ||
| View original record | -3- At higher speeds, however, the difference becomes appreciable, presumably due to the greater free air area of the square tube. (4) 5t/7 Round Tubes. These results again confirm that this tube,… | ||
| Scan352 | Radiator tube design, comparing samples from Rolls-Royce of America and others to improve cooling efficiency. | ||
| View original record | Hs/Rml/AM14.10.30 contd. -4- Since completing these tests we have received a sample radiator tube from Rolls-Royce of America. These tubes are hexagon ended, round centred copper tubes, 9 mm. across… | ||
| Scan353 | Comparison of square and round radiator tubes at full throttle and low speeds. | ||
| View original record | COMPARISON OF SQUARE & ROUND TUBES AT FULL THROTTLE LOW SPEEDS. | TYPES OF RADIATOR MATRIX. | FULL THROTTLE TEST. CAR BRACED TO MAINTAIN REQ'D SPEED. | |---|---| | | ALL CLOSED. | LOUVRED BONNET. | |… | ||
| Scan354 | Comparative table of radiator performance and specifications under various test conditions. | ||
| View original record | FIGURES GIVEN ARE CRITICAL ATMOSPHERIC TEMPERATURE AT WHICH THE CAR WILL EVENTUALLY BOIL IF DRIVEN SUFFICIENTLY LONG. DETAILS OF RADIATOR. TYPE OF RADIATOR TUBES. 60 M.P.H. NO BONNET VENTILATION ALL… | ||
| Scan355 | Graph plotting hydraulic restriction of a tube radiator, showing delivery and pump suction pressure against engine RPM. | ||
| View original record | HYDRAULIC RESTRICTION OF ☐ TUBE RADIATOR. RAD. E. 77675 TUBES E. 81385 6M/M PARALLEL SQUARE. DELIVERY GAL/MIN. ENGINE R.P.M. SUCTION SIDE OF PUMP LBS/☐' PRESS. DEPN SUCTION SIDE OF PUMP. 6/7 1/2 TUBES… | ||
| Scan356 | Superseded document from the Test Room, marked as a copy. | ||
| View original record | SUPERSEDED TEST ROOM, 14 OCT 1930 COPY. | ||
| Scan357 | Graph detailing the results of water flow tests on a P.I. No. 7 unit with a standard radiator. | ||
| View original record | WATER FLOWS TESTS ON P.I. NO 7 UNIT STANDARD RADIATOR (E.77675) OFF PRODUCTION STANDARD CIRCULATION LEGEND: R.P.M. 2500 R.P.M. 3000 R.P.M. CIRCULATION UNDER 4 LBS/SQ'' PRESSURE 2500 3000 AXIS LABELS:… | ||
| Scan358 | Page with a purple ink date stamp from the Test Room. | ||
| View original record | ROYCE, LIMITED TEST ROOM, 14 OCT 1930 COPY | ||
| Scan359 | Improving radiator efficiency to prevent overheating by adding indentations to the tubes. | ||
| View original record | x766. To Sg. from Hs. c. Wor. X.766. X.7250. HS2/AD14.10.30. OVERHEATING. Ref. Sgll/E13.10.30. We have sent to you today a further report on overheating. The most important point shewn up in these… | ||
| Scan360 | Design improvements for radiators, bonnets, overflow valves, and vents. | ||
| View original record | HS. } FROM R. BY. } x766 RL/M14.10.BO. Copy to SG. Copy to WOR. Copy to E. DA. EV. RADIATORS & BONNETS. SQUARE TUBES? OVERFLOW VALVE, & BONNET VENT. X.7250 X.5260. X.5250. X.1085. X.7260. X.766.… | ||
| Scan361 | Efficiency of indented radiator tubes to solve an overheating issue. | ||
| View original record | Handwritten top left: HS Handwritten top center: 8766. Handwritten top right: x766 x3250 x5250 Handwritten center left (circled): 83/16'38 To Hs. from Sg. re Overheating. Sg12/E15.10.30 Copy to Wor.… | ||
| Scan362 | On resolving overheating issues by modifying radiator tubes with indentations for increased efficiency. | ||
| View original record | To Sg. From Hs. c. to Wor. 8766 Hs.4/MJ.18.10.30. X. 766. X. 7250. X. 5250. OVERHEATING. Replying to Sg12/E15.10.30. R. has agreed that we can on existing round tubes add the indentations to increase… | ||
| Scan363 | Table of results from radiator performance tests conducted at Brooklands at various speeds and throttle settings. | ||
| View original record | TYPE OF RADIATOR. 30 M.P.H. Full Throttle. 45 M.P.H. Full Throttle. 60 M.P.H. All Closed. All Out. All Closed. TABLE DATA: First Row Headers: ST Top Water & Ats., Mean Water & Ats. Row: 6 mm. Sq. Tube… | ||
| Scan364 | Results of tests on different radiator tubes and louvred bonnets. | ||
| View original record | To R. From Hs/Rs. c. to SE. Wor. c. to R. Da. c. to RV. 8766. Hs/Rs.2/MJ.20.10.30. X. 766. X. 7250. X. 5250. RADIATOR TESTS. We have now confirmed the results obtained on the turbulent flow standard… | ||
| Scan365 | Improving radiator efficiency and cost by using 7 m.m. square tubes with bulges for turbulence. | ||
| View original record | -2- we use 7 m.m. square tubes expanded horizontally only, and arranged with bulges for turbulence we shall have a radiator that is about 10° C. better than our present standard and one that will not… | ||
| Scan366 | Table comparing critical atmospheric temperatures for different radiator types causing overheating under various driving conditions. | ||
| View original record | TYPES OF RADIATOR. VERTICAL LOUVRES FULL THROTTLE. 30 M.P.H. 40 M.P.H. NO BONNET VENTILATION 60 M.P.H. All Out. 6 mm. Parallel Sq. Tube. E.81385. 30.25 34.0°C. 42. 33 6/7 1/4 mm. Turbulent Flow Tubes.… | ||
| Scan367 | Immediate implementation of a tube indentation modification to address an overheating issue. | ||
| View original record | COPY. x766. To Wor. From Sg. c. to Hs. By. re. Overheating. Sg9/21.10.30. X.7250. X.5250. X.766. Referring to Hs.4/MJ.18.10.30. and former correspondence as the modification of indenting the tube… | ||
| Scan368 | The modification of radiator tubes with indents to resolve overheating issues. | ||
| View original record | COPY. x766. X.7250 X.5250 X.766. To Sg. From Wor. c. to Hs. By. Wor3/T.25.10.30. Re. Overheating - Sg9/E21.10.30. We all do agree that we can, without risk, proceed t make Radiator Tubes with the… | ||
| Scan369 | Confirming agreement to proceed with a modification to radiator tubes regarding an overheating issue. | ||
| View original record | COPY. x766 To Wor. From Sg. re Overheating. Sg3/E27.10.30. c. to Hs. By. X.7250. X.766 X.5250. Thanks for Wor3/T25.10.30. I am pleased to note that all agree that we can without risk proceed to make… | ||
| Scan370 | Square versus round radiator tubes and the design of bonnet vents and shutters. | ||
| View original record | COPY. X766. To Wor. From Sg. c. to Hs. By. c. to EV. re Radiators & Bonnets. Square Tubes. Overflow Valve and Bonnet Vent. Sgls/E27.10.30. X.7250.X.5260. X.5250.X.1085. X.7260.X.766. I have just seen… | ||
| Scan371 | Efficiency of square versus round radiator tubes and bonnet ventilation designs. | ||
| View original record | COPY. x 766. To Wor. From Hs/An. Hs/Rn.1/M330.10.30. Re. Radiators and Bonnets. X.7250. X.1085. X.5250. X.766. X.7250. X.5260. With reference to Sgl8/E.27.10.30. We think that the real facts that R.… | ||
| Scan372 | Radiator and acceleration tests conducted at Brooklands. | ||
| View original record | COPY. X766. To Rm. From G. Radcliffe. 29/31.10.30. X. 788. X. 766. X. 7250. 19-EX. RADIATOR TESTS ON BROOKLANDS. Figures given are average max. attained (2 tests each). Std. Round Tube Rad. Std. Round… | ||
| Scan373 | Test report on a thermostat marked 'A', detailing water temperature readings and jamming issues. | ||
| View original record | x766. 22-EX. 20.11.30. X.766. X.7250. Thermostat marked A. Water temperatures were taken every five minutes. 57.5) 57.5) Speed of car 30 m.p.h. (approx.) 60. ) 61. ) 61. ) 62. ) 60. ) Speed of car 40… | ||