Rolls-Royce Archives
| Identifier | Entry | ||
| Scan001 | The testing of a new speedometer at Brooklands, detailing its accuracy and the effects of tyre diameter. | ||
| View original record | To R. from Hs/Bm c.c. SG. c.c. Wor. Da. c.c. E. By. ORIGINAL Hs/Rm2/AD14.8.30. X4308 SPEEDOMETERS. We recently carefully checked speedometer No. D.668, a new speedometer taken from production, on… | ||
| Scan002 | Continued report on speedometer testing, comparing American cars to the company's own. | ||
| View original record | Hs/AMB/AEM.4.5.30 contd. -2- At the same time as we carried out this test we checked a number of speedometers on various American cars all of which had the characteristic that the mileage was correct… | ||
| Scan003 | Correspondence regarding the development and testing of an experimental K.S. petrol gauge unit. | ||
| View original record | From Hs/Sn. ORIGINAL Hs/AM4/4.8.30. X4038 K.S. PETROL GAUGE. you will recollect that in De/EVL/1S27.6.30 you asked us to alter the K.S. petrol gauge to make it suitable for a centrally vented tank… | ||
| Scan004 | Testing a centrally vented petrol tank and dashboard gauge unit under pressure. | ||
| View original record | HS/SM/AM4.8.30 contd. -2- line to one of our dashboard units. A pressure of 6 lbs/sq.in. was then introduced on to the petrol in the tank and the pressure maintained at that figure. The tank vent and… | ||
| Scan005 | Page outlining requirements for a tank unit's positioning and venting arrangements. | ||
| View original record | HS/AM/ADL4.8.30. contd. -3- pumps much more freely than the present unit. If you are interested in this unit we will test it for overnight loss on a car with very volatile spirit. The tank… | ||
| Scan006 | The successful 11,000-mile test of a push button switch without carbon contacts, recommending its standardisation. | ||
| View original record | To R. from EFC. c.c. MOT. E. c. Ds. Hy. ORIGINAL EFC9/ADL8.8.30. X.6015. PUSH BUTTON SWITCH WITHOUT CARBON CONTACTS. Further to our EFC1/ADL20.3.30, in addition to the bench tests therein reported a… | ||
| Scan007 | Test report on the friction horsepower and mechanical efficiency of a Phantom II engine. | ||
| View original record | ORIGINAL To Ds. From Hs/ACL. c. to Rg. Hs/ACL.2/MJ.18.8.30 X7771 PHANTOM OVER-RUN TORQUE. We have made a test of the friction H.P. of the Phantom 11 engine at 1000 R.P.M. by the method of cutting out… | ||
| Scan008 | Engagement tests for the Phantom II sequence starter, specifically the sharp-edged motor pinion and flywheel gear. | ||
| View original record | To R. from EFC. c. Sg. c. Wor. E. c. De. Ev. ORIGINAL EFC2/AD20.8.30. X7625 X7655 PHANTOM II SEQUENCE STARTER. COMPLETELY SHARP EDGED MOTOR PINION AND FLYWHEEL GEAR. Engagement tests of the… | ||
| Scan009 | Test report on a motor and crankshaft rig, detailing various operational trials and their outcomes. | ||
| View original record | EPC2/AD20.8.30 contd. -2- (1) The motor was fitted to the laboratory crankshaft rig and electrically connected to the main and auxiliary switch unit and to a mechanically operated push button switch… | ||
| Scan010 | Test report detailing the results of engagement and endurance tests on a gear mechanism under varying voltage conditions. | ||
| View original record | -3- KFC2/AD20.8.30 contd. Two corner jams occurred and engagement was rather noisy at times. (4b) This was a repetition of test (2) but with the supply voltage reduced approximately 10% below normal.… | ||
| Scan011 | Test report page detailing pinion and gear engagement performance and attributing burring to a high voltage test. | ||
| View original record | EFC2/AD20.8.30 contd. -4- circumstances and any kind of failure or unsatisfactoriness and the cause or causes of these noted. In this particular case this went through completely satisfactorily. There… | ||
| Scan012 | Report recommending hardening flywheel gear teeth to reduce burring and chipping, based on preliminary test results. | ||
| View original record | EFC2/AD20.8.30 contd. -5- In order to reduce the initial burring over of the flywheel gear teeth edges it would appear advisable to have the flywheel gear teeth harder. This is more particularly the… | ||
| Scan013 | Reverting to 5 or 10 degree helical teeth and the potential impact on the main control spring. | ||
| View original record | EFC2/ADEO.8.30 contd. -6- to revert to 5° or perhaps 10° helical teeth with, as in the above case, absolutely sharp edges. It has generally been considered there should be a slight advantages with the… | ||
| Scan014 | The fourth series of Brooklands tests comparing radiator and cooling system performance. | ||
| View original record | To R. from Hs/ma. γ c. SZ. c. MOT. E. c. DR. HV. Hs/ma/AD21.8.30. x588 BROOKLANDS TESTS. 4TH REPORT. Further comparisons were carried out on Brooklands to test the square tube radiator, an altered… | ||
| Scan015 | Radiator matrix performance, cooling efficiency, and the effects of bonnet ventilation at various speeds. | ||
| View original record | -2- for by the fact that it holds rather less water. From the excellent figures of the Chrysler we feel that we could, with advantage, have more indirect cooling surface in the radiator without losing… | ||
| Scan016 | Improving engine cooling system efficiency through various modifications. | ||
| View original record | -3- Roughly, at speed, bonnet shutters increase the efficiency of the system 11%, louvres a further 5%. Fan. The fan appears to be just as important at high speeds as at low speeds. We have shown that… | ||
| Scan017 | Analysis of gear ratio, ignition, and cooling performance, with a comparison to Chrysler and plans for further tests. | ||
| View original record | -4- Gear Ratio. Does not have very much effect within the limits of practical application. Ignition. The car is not exceptionally sensitive to ignition advance for overheating. Chrysler. The Chrysler… | ||
| Scan018 | Page from a test report outlining the conditions for testing, including shutter settings, fan modifications, gear ratios, and car load. | ||
| View original record | -5- CONDITIONS OF TESTS. Shutters. Where "shutters open" is referred to in these tests it means four bonnet shutters as on Phantom I. At present only two bonnet shutters are fitted as standard in the… | ||
| Scan019 | Test report table showing radiator temperatures under various bonnet ventilation and fan belt conditions. | ||
| View original record | STANDARD RADIATOR & 7 1/2 mm. TUBES. | Condition of bonnet ventilation 19-EX. | Std. Fan Belt Solid. All out 80 M.P.H. | Altered Fan Solid. All out 80 M.P.H. | Std. Fan Belt Solid 75 M.P.H. | Std. Fan… | ||
| Scan020 | Table comparing radiator performance and specifications under various bonnet ventilation and fan configurations. | ||
| View original record | Top Table: | Condition of Bonnet vent-ilation 19-EX | Sq. tube rad. All out Std. Fan. belt Choc-o-bloc | Sq. tube rad. All out Altered fan belt Choc-o-bloc. | Sq. tube rad. 75 M.P.H. Std. Fan Belt… | ||
| Scan021 | Test report detailing the effect of various car alterations on top water temperature. | ||
| View original record | VALUE OF VARIOUS ALTERATIONS TO CAR CONDITION. 75 M.P.H. Alterations in top water temperature from standard un-ventilated condition. C.C. opened. | 3°C. drop Radiator shutters removed. | No… | ||
| Scan022 | Full throttle test results comparing top water temperatures for different vehicle configurations and speeds. | ||
| View original record | A. FULL THROTTLE TEST 45 M.P.H. (1) 19-EX Std. Radiator and fan belt choc. Condition. | Top water temperature --- | --- | --- | Fan standard. | Fan altered. ==================================== All… | ||
| Scan023 | Comparison of cooling system performance between a Chrysler and a Rolls-Royce Phantom II under various speed and throttle conditions. | ||
| View original record | COMPARISON CHRYSLER AND ROLLS-ROYCE COOLING. 60 M.P.H. Top Water Temp. (1) Phantom II Std. Radiator. Fan etc. All closed. 77°C. Four shutters open. 71°C. (2) Chrysler. Louvred bonnet. 73°C. 30 M.P.H.… | ||
| Scan024 | Comparative vehicle cooling tests at Brooklands, comparing a Phantom II with five other cars. | ||
| View original record | To R. From Hs/MA. C. to SP. MT. C. to AC. C. to RV. R. ORIGINAL Hs/AM. T/AJ. 22. 4. 31. x788 x4012 x766 x1692 x7771 x4588 x5771 x8531 PIFTY BROOKLANDS REPORT. We have now completed the comparisons of… | ||
| Scan025 | Comparison of cooling system volumes and performance against competitor vehicles like Pierce Arrow and Graham Paige. | ||
| View original record | -2- our cooling systems compared with other cars. TOP WATER TANK VOLUME. We have very much less top water tank space per gallon of cooling water carried than the Pierce Arrow, Chrysler or Marmon.… | ||
| Scan026 | Report comparing 25 HP and 30 HP cars, with maximum speed test results for various models and chassis. | ||
| View original record | -3- will get a good reputation when compared with the average 30 H.P. car. On the other hand the 25 HP. R.R. must be similarly suffer due to its short stroke. We have nothing at all to spare on the 25… | ||
| Scan027 | Comparative table of radiator face area, volume, and on-track temperature for various car models. | ||
| View original record | CAR. | Face Area per 1000 litre disp. per mile. ROLLS-ROYCE 25 HP. | 83.0 sq.ins. CHRYSLER 75. | 82.7 sq.ins. HISPANO. | 77.3 sq.ins. ROLLS-ROYCE 40/50. | 71.2 sq.ins. GRAHAM PAIGE. | 65.2 MARMON |… | ||
| Scan028 | Comparative graphs of acceleration figures and speedometer calibrations for various vehicles. | ||
| View original record | COMPARATIVE ACCELERATION FIGURES ACCELERATION FT/SEC 2 3.5 3.0 2.5 2.0 1.5 1.0 ROAD SPEED M.P.H. 10 20 30 40 50 60 GRAHAM PAIGE SILENT THIRD G.W.H. FIGURES 24 E.X. 6000 MILES GRAHAM PAIGE TOP 14G IV… | ||
| Scan029 | Comparative chart of technical specifications and performance data for various American and Rolls-Royce cars. | ||
| View original record | TYPE OF CAR, TYPE OF BODY, WT OF COMPLETE CAR AS TESTED DIMENSION OF MATRIX, WATER CAPACITY OF SYSTEM TYPE OF MATRIX, TANK DIMENSIONS FAN AND DRIVE DIRECT DRIVE RATIO AND EFFECTIVE TYRE CIRCUMFERENCE… | ||
| Scan030 | Bench tests of thermostat radiator shutters to investigate operational lag and hysteresis loss. | ||
| View original record | To R. From Hs/Bn. c. to SG. Not. c. to Rg. E. c. to BY. Da. ORIGINAL Hs/Bn.5/W. 26.8.30. x3499 THERMOSTAT RADIATOR SHUTTERS. We have been conducting bench tests to ascertain why the thermostatically… | ||
| Scan031 | Shutter friction losses, comparing the effort required and operating temperatures for different shutter types. | ||
| View original record | -2- He/Wa.3/SL.26.8.30.Contd Shutter Friction Losses. The frictional loss in shutter operation varies enormously with the method of manufacture. Comparing an average set of shutters with a set of… | ||
| Scan032 | The performance of thermostat-controlled radiator shutters and recommendations for improvement. | ||
| View original record | -3- He/SM./L.26.8.30.Contd. Fitting a spring giving 13 lbs. load in the shutter fully open position in the thermostat we get - Shutters start opening - 64°C. } " Fully open - 71°C. } FREE SHUTTERS "… | ||
| Scan033 | Drawing showing the suggested location of a large Smithermet component. | ||
| View original record | SUGGESTED LOCATION OF LARGE SMITHERMET ROLLS ROYCE LTD ¢ S.D D.A. ROOM, 29 AUG 1930 DERBY 19/8/30. | ||
| Scan034 | 40/50 clutch tests comparing the burnout resistance of a new fabric-lined clutch with a standard one. | ||
| View original record | To P. From Hs/Ra. c. to Sd. FOX. c. to Da. E. c. to Sy. ORIGINAL Hs/Ra.6/MJ.30.8.30. X7460 X7305. 40/50 CLUTCH TESTS. We carried out some tests to determine the relative resistance to "burning out" of… | ||
| Scan035 | Spring inter-leaving material and issues with clutch performance compared to American standards. | ||
| View original record | -2- Hs/30.6/ML.31.5.31. Contd. the material used for spring inter-leaving and are trying this. It is rather surprising that the Americans say they can burn out our standard clutch and yet have not run… | ||
| Scan036 | Non-standardization of wider wheel tracks due to feasibility and international road compatibility. | ||
| View original record | To Da. From Hs/Rn. ORIGINAL Hs/Rn.7/MJ.30.8.30. With reference to Da2/M22.7.30. 17810 Undoubtedly the wheels being moved further out from centre point improves the steering. However, we have not… | ||
| Scan037 | Analysis of variables like tyre size, inflation, and speed affecting A.T. speedometers. | ||
| View original record | To R. from EPC. c. Sg. c. WOR. E. c. Ds. Py. PN. ORIGINAL EPC2/AD4.9.30. X.4308. A.T. SPEEDOMETERS. In our EPC1/AD19.8.30 we mentioned the dependence of road wheel and speedometer drive revolutions… | ||
| Scan038 | Continued document discussing calculations for speedometer instrument revolutions per mile. | ||
| View original record | -2- EFC2/A13.9.30 contd. compared with those at slow and moderate speeds. This result is presumably for fully inflated tyres. With lower inflation the effect would probably be greater correspondingly… | ||
| Scan039 | Analysis of speedometer and odometer accuracy based on tyre size, inflation, speed, and temperature. | ||
| View original record | -3- EFC2/AD4.9.30 contd. counter mile should be made to agree. The resulting slight negative error in the counter mile in the extreme circumstances of the largest tyres used most highly inflated and… | ||
| Scan040 | Speedometer accuracy at high speed, affected by the centrifugal effect of tyres, and a proposal to correct it. | ||
| View original record | EFC2/AD4.9.30 contd. -4- (to the miles) high, and absolutely, still higher. At the higher range of speeds (above 40 miles per hour) the effect is, (owing to the centrifugal effect of the tyres) that… | ||
| Scan041 | Continued discussion on the compression of instrument scales above 40 mph. | ||
| View original record | EFC2/AD4.9.30 contd. -5- above 40 miles per hour be supplied to the makers of the instrument with a request to compress the scales accordingly. It would be probable that one law of compression would… | ||
| Scan042 | The causes of brake thumping on the 25HP car and a proposed update for the instruction manual. | ||
| View original record | To R. From Hs/Rn. c. to Sg. c. to Wor. c. to By. c. to Da. c. to E. ORIGINAL 25HP. CAR (JAPAN). BRAKES. Hs/Rn. S/WJ.5.9.30. x5770 x5360 x5420 y5370 With reference to R1/M20.8.30. It is quite correct… | ||
| Scan043 | Brake and clutch experiments, focusing on materials like Ferodo linings and cast iron. | ||
| View original record | -2- Hs/AN.S/AL.5.9.30.Contd. this reason we are trying a Ferodo lining on the swinging arm bearing. Though there is no doubt that the variation in the coefficient of friction in the servo lining is… | ||
| Scan044 | Clarifying that 43% of Phantom II cars carry either one or two spare wheels at the rear. | ||
| View original record | ORIGINAL To R. from Hs. c. Sg. c. WOr. Da. c. Da/Ev. E. x7600 Hs2/ADS.9.30. POSITION OF SPARE WHEELS. During our last visit to W.W. we understood from Da/Ev. that very few cars were being delivered… | ||
| Scan045 | Single point radiator mounting scheme for specific complaint cases, mentioning 'jelliers' and diabolo rubber fittings. | ||
| View original record | ORIGINAL To Da. From Hs/Rm. Hs/Rm.2/MJ.5.9.30. X7250 We fear that you may be unduly alarmed by the sketch of single point radiator mounting which we ran on 24-EX (Hs.299, attached). We should like to… | ||
| Scan046 | Sketch of radiator side fittings on 24EX, showing a combination of parts Nsd. 3062 and Nsd. 3059. | ||
| View original record | Hs 299 Hs 292. Ex 5039 Ex 5041 Ex 5042. Ex 5040 Hs 293. Sketch of Radiator Side Fittings on 24EX Combination of Nsd. 3062 + Nsd. 3059. STAMPED: SERVICE DEPT. REF. No. 5 SEP 1930 DERBY | ||
| Scan047 | Suggested alterations and design considerations for a K.S. petrol gauge tank fitting. | ||
| View original record | ORIGINAL To DA/EV. From Hs/AJL. c. to Sg. c. to Ly. Hs/AJL.1/MJ.6.9.30. Y4038. K.S. PETROL GAUGE TANK FITTING. In reply to Da/Ev5/M26.8.30. the suggested alteration to the banjo piece to enable a pump… | ||
| Scan048 | Vibrations in the 25 HP model caused by the whirling of the propeller shaft at high speeds. | ||
| View original record | To R. From Hs. c. to Sk. c. to Mor. c. to E. c. to Ds. c. to My. ORIGINAL Hs. 2/MJ. 8.9.30. 25 HP. VIBRATIONS. X. 634. X. 5340. We have proved definitely that one cause of the vibrations we get at… | ||
| Scan049 | Cooling problems and radiator modifications on the Phantom II cars. | ||
| View original record | To R. From Hs. c.c. to SG. Wor. c.c. to E. Da. c.c. to Ev. Hs. 2/MJ. 9.9.30. X766 X7-50 PHANTOM - COOLING. Recent tests which have been carried out show the Phantom ll cooling is not now as good as on… | ||
| Scan050 | Page 2 of a report stating that a complete report is being prepared following a comparison with the original Phantom II. | ||
| View original record | -2- Hs.2/ML.9.9.30.Contd. compared with the original Phantom 11. This is briefly the position, a complete report is being prepared. Hs. | ||
| Scan051 | Failures and proposed improvements for the Phantom clutch. | ||
| View original record | To R. From Hg. c. to SG. c. to Wor. c. to E. c. to Ds. c. to By. [STAMP] ORIGINAL PHANTOM CLUTCH. We have been going into the failures of the present Phantom clutch and have been able to arrange a… | ||
| Scan052 | Ongoing clutch issues related to the driven member, pressure plate binding, and subsequent modifications. | ||
| View original record | -2- Hs.2/LL.10.9.30. Contd. We are still not free from troubles with the clutch having the Ferodo rivetted to the driven member. Because of this we are going ahead with a further batch of 50 cars with… | ||
| Scan053 | Recommendation to increase the adjustment range for the hand brake lever on left-hand drive chassis. | ||
| View original record | To R. From Hs. c. to Sg. Nor. c. to S. Da. c. to By. ORIGINAL X7772. X7330. HAND BRAKE ON THE LEFT-HAND CHASSIS. We find that we are rather short of movement on the hand brake lever at the present… | ||
| Scan054 | Tests of an automatic boost regulator, detailing initial inconsistent results due to friction and subsequent improvements. | ||
| View original record | To R. From Hg/ACL. c.c. to Sg. NOR. c.c. to RC. E. c.c. to SV. ORIGINAL Hg/ACL.1/MJ.11.9.30. X4033, AUTOMATIC BOOST CONTROL. We have carried out a number of tests on the Automatic boost regulator… | ||
| Scan055 | Engine boost control adjustments and performance under various throttle and altitude conditions. | ||
| View original record | -2- In this particular case the aneroid was adjusted to give the required -1/2 lbs/sq.in. boost with the engine operating under altitude conditions - i.e. with air intakes throttled by means of air… | ||
| Scan056 | Issues with friction and 'hunting' in engine controls, boost regulators, and magneto operation. | ||
| View original record | -3- Hs/ACL.1/ML.11.9.30 Contd friction in the controls as possible to prevent too great a divergence between the up and down readings. Considerable trouble existed due to violent "hunting" over the… | ||
| Scan057 | Performance graph of an automatic boost regulator for an F. Engine T.49 under test conditions. | ||
| View original record | CHARACTERISTIC OF AUTOMATIC BOOST REGULATOR. TESTS ON FULL SUPERCHARGED. F. ENGINE. T.49. BOOST REGULATOR DES. 1293. Y-AXIS (LEFT & RIGHT): BOOST PRESS. lbs/sq" VALUES: +2, 0, -2, -4, -6, -8 X-AXIS… | ||
| Scan058 | The mileage testing of Watford Type E.W.6A magnetos with tungsten points. | ||
| View original record | To R. from EFC. c. Sg. c. Wor. E. c. De. Ev. ORIGINAL EFC2/AD11.9.30. X.7792. WATFORD TYPE E.W.6A. MAGNETOS. WITH 60º RANGE AND TUNGSTEN POINTS. It may be remembered from our report ref.… | ||
| Scan059 | Recommendation to standardise the fitting of tungsten contact points to EW6A magnetos following successful testing. | ||
| View original record | -2- EFC2/ADL1.9.30 contd. The fitting of tungsten contact points has improved the contact point reliability considerably. The points will run 10,000 miles without trimming or cleaning being necessary… | ||
| Scan060 | The characteristics and issues with thermostat-controlled radiator shutters. | ||
| View original record | To R. From Mm/ C. S. S. HS. C. G. V. COR. C. W P. To E. AV. DR. ORIGINAL Mm/RM.1/HM.12.9.30. X3499. THERMOSTAT CONTROLLED SHUTTERS. We have received the modification to reduce the friction in the… | ||
| Scan061 | Graphical chart detailing Smith's Calorstat tests, plotting load versus temperature for radiator shutter operation. | ||
| View original record | 9.9.30 SMITH'S CALORSTAT TESTS LOADS REQ'D TO JUST RAISE SYLPHON FROM BOTTOM OF CASING, & ALSO TO HOLD BELLOWS AGAINST STOP. NO GUIDE BUSH. WITH RETURN SPRING JUST OPENING. WITH RETURN SPRING FULL… | ||
| Scan062 | Blank cover sheet with a purple ink stamp in the bottom right corner. | ||
| View original record | LIMITED COM, 12 SEP 1930 DERBY. | ||
| Scan063 | Cover note for attached documents concerning valve spring coil vibrations. | ||
| View original record | ORIGINAL To R. from EFC. c. Sg. c. E. Rg. EFC7/AM 3.9.30. X290. Please find attached copy of some notes dealing with the subject of valve spring coil vibrations and which were prepared for Mr. Bailey… | ||
| Scan064 | The failure of American-supplied bumpers during stress testing. | ||
| View original record | ORIGINAL. To SG. From Hs/An. c.c. to R. c.c. to WOT. c.c. to Ds. c.c. to K. c.c. to BY. Hs/An.2/AJ.15.9.30. X4522 TESTS ON BUMPERS FOR AMERICA. We have carried out the American underwriters' tests to… | ||
| Scan065 | Blueprint of a component showing front and rear views with dimensions. | ||
| View original record | FRONT 10.75" 7.00" REAR | ||
| Scan066 | Blank document with a Print Room date stamp. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM, 13 SEP 1930 | ||
| Scan067 | Requesting the return of a Quadruplex pump sent for evaluation, as the manufacturer is now pressing for payment. | ||
| View original record | ORIGINAL To E. From Hs/Rm. Hs/Rm.1/MJ.15.9.30. Y4 461. We sent R. a Quadruplex pump to look at, at the end of June this year. At the time he thought he might like to use it at Le Canadel. The makers… | ||
| Scan068 | Technical memorandum comparing two types of Phantom clutches and their associated performance issues. | ||
| View original record | TO R. From Hs. c. to Sg. Wox. c. to Z. De. c. to Ev. ORIGINAL 8 x7480 y7305 PHANTOM CLUTCH. The more tests we do comparing the two types of clutches, the more we are convinced that it would be safer… | ||
| Scan069 | Clutch faults, performance testing, and a proposal to demonstrate its superiority over a competitor's design. | ||
| View original record | -2- Hs/SL.1/15.2.30.Contd. to change gear at high speeds. Another fault we have had is with the cast iron back plate. Even with a moderate amount of slipping this plate is dished so that the initial… | ||
| Scan070 | Development of silent third and easy-change gearboxes and the testing of a new four-speed box from an American company. | ||
| View original record | To. R. From Hs. c.c. to BR. Wor. c.c. to E. Ds. c.c. to Sy. ORIGINAL Hs.S/SJ.19.9.30. X3720. GEARBOXES. Before OY. returned to U.S.A. he was naturally interested in the development of the silent third… | ||
| Scan071 | Letter from Rolls-Royce of America concerning the evaluation of an internal geared transmission from Automotive Research Corp. | ||
| View original record | COPY OF LETTER REC'D FROM :- Rolls-Royce of America Inc. Springfield, MASS. OY.1. Sept.6th.1930. Rolls-Royce, Ltd., Derby, England. Attention of : Mr. A.W. Hives. INTERNAL GEARED TRANSMISSIONS. Have… | ||
| Scan072 | Letter discussing a new 'selector' shift gearbox, ideal axle ratios, and a torque-equalized brake system. | ||
| View original record | Oy-l -2- no charge. Both schemes and the actual box will be fitted with the new "selector" shift which is a development of the Maybach clutch, similar to the Salerni coupling, but simpler in… | ||
| Scan073 | Letter from Carl A. Neracher regarding Chrysler's spool gear type transmissions and their potential application. | ||
| View original record | COPY OF LETTER REC'D FROM :- Carl A. Neracher, 225 Covington Drive, Detroit, MICHIGAN. Sept. 6th.1930. Mr. Hives, Rolls-Royce Co.Ltd., Derby, ENGLAND. My dear Mr. Hives, I recently received a letter… | ||
| Scan074 | Letter discussing synchromesh transmissions, Chrysler's experience, and arranging a test of a small transmission. | ||
| View original record | -2- Mr. Pearson and me here in Detroit, will probably also write you about them. He seemed quite interested to have you try this type of synchronizer. Complete sets of details and assemblies of… | ||
| Scan075 | On the testing of nitro hardened steel crankshafts and a recommendation for an initial order. | ||
| View original record | To R. From Hs. c.c. to SG. Nor. c.c. to RV. E. c.c. to Rg. Hs./4/10.9.30. x4469 x7010 ORIGINAL NITRO HARDENED STEEL. With reference to R4/16.9.30. We have completed 16,000 miles on 23-EX. car fitted… | ||
| Scan076 | Proposing a visit to bring a left-hand drive car fitted with an anti-spilling radiator and low-friction shutters. | ||
| View original record | To R. From Hs. c. to Sg. c. to Wor. ORIGINAL Hs.4/MJ. 23.9.30. X1698 As we have Capt. Forsyth at Derby tomorrow and Sg. is coming on Thursday, we propose visiting W.W. on Tuesday next if convenient to… | ||
| Scan077 | The cooling efficiency of different radiator types for the Phantom II model. | ||
| View original record | To R. From Hs/Rn. c. to WAG. UR. c. to ES. Ds. c. to RV. ORIGINAL Hs/Rn.1/NJ.24.9.30. x7250 x766. PHANTOM II COOLING - RADIATORS. In Hs/Rn.2/AD21.2.30 we gave figures comparing this square tube… | ||
| Scan078 | Report discussing the efficiency of direct versus indirect radiator cooling, with an attached graph showing mean air speed through a radiator versus car speed. | ||
| View original record | -2- Hs/SL.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… | ||
| Scan079 | Radiator efficiency tests, comparing different types and analyzing heat dissipation. | ||
| View original record | -3- Ha/SL.1/24.9.30.Contd. we dissipate about 19 1/4 H.P. per sq. foot of frontal area /100°F. difference in temperature between the mean radiator temperature and the atmospheric temperature, which… | ||
| Scan080 | Comparison of radiator tube designs (round, square, hexagon) focusing on efficiency, surface area, and construction. | ||
| View original record | -4- HS/JAL/LHL.24.2.30.Contd. Again, from surface, free air area, and direct cooling we should expect the square tube radiator to equal the 6/7m.m. radiator in efficiency. The results show, however,… | ||
| Scan081 | Improving radiator cooling efficiency by adjusting tube thickness and design, and examining the effects on engine temperature. | ||
| View original record | -5- No/A.1/KL.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… | ||
| Scan082 | Continued discussion on Chrysler radiator design and its matrix with fine air passages. | ||
| View original record | -6- He/S.L/ML.24.2.30.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… | ||
| Scan083 | Comparative analysis table of different radiator tube designs and their performance metrics. | ||
| 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… | ||
| Scan084 | Graph and table comparing the performance of different types of radiator cores for slow-speed cooling. | ||
| View original record | TYPES OF RADIATOR CORE FOR SLOW SPEED COOLING Y-Axis: H.P. DIS. PER SQ. FT. FRONTAL AREA PER 100° DIFF IN TEMP. X-Axis: AIR SPEED THROUGH MATRIX M.P.H. Diagram 'C': .078 .250 ZIG ZAG RIBBON WITH… | ||
| Scan085 | Blank page stamped by the Print Room in Derby. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM 24 SEP 1930 DERBY. | ||
| Scan086 | Technical drawing of a square matrix tube. | ||
| View original record | TUBES TO BE ANNEALED BY THE SUPPLIERS AGAINST SEASON CRACKING ONLY. LENGTH OF TINNING. APPROX. WT. PER LB = .134. DEBURR INSIDE. EACH TUBE TO BE TESTED TWICE & NOT BY THE SAME OPERATIVE, FIRST BEFORE… | ||
| Scan087 | The reverse of a document showing a purple ink 'Print Room' stamp from Derby. | ||
| View original record | ROLLS-ROYCE, ...LD PRINT RO 25 SEP 1930 DERBY. | ||
| Scan088 | Extensive testing of a push-button switch without carbon contacts. | ||
| View original record | To R. from EFC. c. Sg. c. Wor. E. c. Ds. Hy. ORIGINAL EFC2/AD30.9.30. X.6015. PUSH BUTTON SWITCH WITHOUT CARBON CONTACTS. Further to our EFCB/ADM8.8.30 and in view of Mr.Elliott's note E3/M27.9.30, we… | ||
| Scan089 | Summary of experiments conducted on flywheel vibrations for a 25 HP engine. | ||
| View original record | To R. From Hs/GR. c. to SS. SGY. c. to RF. E. c. to DA. Ev. ORIGINAL +634 x 5300 FLYWHEEL VIBRATIONS ON 25 HP. Experiments on 12-G4 showed that - (1) With Std. flywheel the vibration period is at 3100… | ||
| Scan090 | Experimental notes on engine flywheel vibration and its measurement. | ||
| View original record | (1) Experiments on 12-34 have shewn that flywheel vibration existed at 3100 R.P.M. (43 M.P.H. in 3rd). At 3450 R.P.M. it had entirely vanished, the engine being quite smooth up to 3610 R.P.M. when the… | ||
| Scan091 | Engine flywheel experiments concerning inertia, vibration, and performance. | ||
| View original record | (2) flywheel therefore lag 90° on No.6 crank. Experiments were also carried out on engine 1Y-G3 giving an out of truth at right angles to axis = .020" / 2 } at * parallel to axis = .012" / 2 } 3100… | ||
| Scan092 | Testing clutchless flywheel configurations and their effect on engine smoothness, vibration and noise. | ||
| View original record | (3) For Standard Clutchless flywheel Mx³ = 134 = decrease of 55%. Causing we for tightened flywheel to be at 2960 r.p.m. (i.e. more or less unchanged) " clutch less " " " 3970 r.p.m. The removal of… | ||
| Scan093 | Investigation into flywheel vibrations and attempted solutions. | ||
| View original record | ORIGINAL To R. From Hs. c. to Mr. H. c. to Mr. E. c. to Dr. RY. Hs.4/AJ.3.10.30. X. 634. X. 7300. FLYWHEEL VIBRATIONS. There is considerable evidence to shew that the vibration we are investigating at… | ||
| Scan094 | Failures and proposed modifications for the Phantom II battery box supports. | ||
| View original record | To R. From Hs. c. to SS. Wor. c. to RY. E. c. to Da. ORIGINAL Hs./AJ.6.10.30. x7526 PHANTOM II BATTERY BOX SUPPORTS. We have had about six failures of battery box supports on cars in customers' hands.… | ||
| Scan095 | Modification drawing for a battery box support, detailing an additional bracket and stiffener. | ||
| View original record | [ "EXISTING BRACKETS", "ADDITIONAL BRACKET", "D72739 STIFFENER", "MOD'N TO BATTERY BOX SUPPORT (PH II)", "6 OCT 1950" ], | ||
| Scan096 | Road tests of the Daimler Fluid Flywheel and Easy Change Gearbox fitted to a 50/40 Double Six chassis. | ||
| View original record | ORIGINAL. To A. From Hs/Sn. B. to SS. X. C. to DR. D. to EV. Hs/Sn.3/MJ. 7.10.30. X2061 X3531 VISIT TO LONDON & THE PARIS SALON. ROAD TESTS OF EASY CHANGE GEARBOXES. Daimler Fluid Flywheel and Easy… | ||
| Scan097 | Test report on a vehicle's fluid flywheel and gearbox performance following brutal treatment. | ||
| View original record | -2- HB/MS.3/HL.7.10.30.Contd. After this rather brutal treatment a small quantity of blue smoke and a smell of oil came into the driving compartment. Presumably this was due to the fluid flywheel… | ||
| Scan098 | Report and diagrammatic sketch explaining the Maybach Overspeed Gear system. | ||
| View original record | Typed Document Text: -3- Hs/AL.7.10.30. Contd. difficult to detect if this was of sufficient magnitude to be appreciable under road conditions. Generally speaking, we were more impressed by this… | ||
| Scan099 | Report page continuing the analysis of competitor vehicle gearboxes and performance, specifically Daimler and Cadillac. | ||
| View original record | -4- HS/BS.M/AL.7.10.30.Contd. accelerator, they cannot engage until the engine speed is correct i.e. changing down the accelerator pedal must be flicked after all the other operations of changing have… | ||
| Scan100 | Road test report on a Daimler Double Six 30/40 chassis. | ||
| View original record | -5- HS/W.3/LAL.7.10.30.Contd. ROAD TESTS OF CHASSIS. DAIMLER DOUBLE SIX 30/40 CHASSIS. 73.5 x 104. 5296 c.c. R.A.C.40.18. Car weight 51 Cwt. 4 seater saloon body 11 ft 6 in. wheelbase. Axle ratio… | ||
| Scan101 | Test report detailing the specifications and performance of a 16-cylinder Cadillac, page 6. | ||
| View original record | HS/MSL/17.10.30 contd. -6- from the transmission and could be felt and heard throughout the body, this was not violent but noticeable. This 12 cyl. engine is certainly smooth at high speeds. 16… | ||
| Scan102 | Performance and noise comparison report between a Phantom II model and a Cadillac. | ||
| View original record | -7- HS/SM/17.10.30 contd. P.II. appears to have a greater maximum speed. The carburation is not good below 30 M.P.H. The engine is not as free from sound as one might anticipate but naturally one… | ||
| Scan103 | Performance evaluation report on a Cadillac, covering cooling, brakes, clutch, and steering. | ||
| View original record | -3- HS/RmS/17.10.30.contd. the Cadillac during test which probably accentuated engine noise. Cooling. Four bonnet shutters each side about 6" x 4". These were all open during the test as were also… | ||
| Scan104 | The suspension, performance, and specifications of a 12 Cylinder Maybach, with comparisons to other cars. | ||
| View original record | Hm/HAH/17.10.30 contd. -3- be very trying on a Continental road. Suspension. Very soft in spite of double acting hydraulic dampers. They appear to have more spring deflection than we do as the… | ||
| Scan105 | The Harris Leon-Laisne's suspension and the frame design of an 8-cylinder Chrysler. | ||
| View original record | -10- HARRIS LEON-LAISNE. We tried this car again which has now substituted rubber for the coil springs in the chassis members. We consider that the change has rather spoilt the suspension but the car… | ||
| Scan106 | Report page discussing automotive frame, radiator, and wing designs of competitor vehicles. | ||
| View original record | -11- We have never previously seen a frame so lacking in front cross members. The appearance of the radiator is obtained entirely by a shell carrying the radiator shutters, the matrix being mounted… | ||
| Scan107 | Notes on Gallay radiators, chassis design, and the Voisin magnetic relay. | ||
| View original record | -12- GALLAY RADIATORS Are fitted to a great number of cars in the Salon, amongst others the latest Citroen, Hispano, Peugeot, Talbot, Chevrolet and Mathis. Until recently they fitted zig-zag ribbon… | ||
| Scan108 | Description of the Voisin magnetic relay transmission system with a diagram. | ||
| View original record | -13- H/S.A/L.7.10.30.Contd. operation seems unnecessary, apart from this the gear has an advantage over the Maybach in that top gear is direct drive. Additionally the gear can also be changed without… | ||
| Scan109 | Summary of trial findings on twelve-cylinder engines, highlighting unresolved issues with power unit noise and suspension. | ||
| View original record | -14- movement and the gear turns solidly i.e. direct drive without gear noise. When H. is excited, plate G. and the sun wheel F. are held. The planets then roll round the sun wheel and give the… | ||
| Scan110 | Inconsistent test results for a square tube radiator. | ||
| View original record | To R. From Hs. c. to SE. Hor. c. to A. Da. c. to Hy. ORIGINAL Hs.1/AJ.7.10.30. X. 7250. X. 788. X. 766. SQUARE TUBE RADIATOR. Tests were carried out on Brooklands last week with the square tube… | ||
| Scan111 | Testing modified Dunlop Silent Tread Tyres for road adhesion and noise. | ||
| View original record | To R. From Hs/AJL c.c. to Sy. Wor. c.c. to C. Da. c.c. to By. ORIGINAL x4050. x7820 x5820 DUNLOP SILENT TREAD TYRES. We have received for test a set of Dunlop 7" x 20" Silent Tread Tyres which have… | ||
| Scan112 | Proposal to standardise a new type of tyre following successful trials showing improved adhesion and wear. | ||
| View original record | -2- Hs/AJL.1/SL.7.10.30.Contd. improvement in road adhesion is that has resulted from the modification, because we have not had the opportunity of testing them under the bad conditions that occur on… | ||
| Scan113 | Arranging to carry the bonnet over the dashboard on the Phantom 11 N.2 Series. | ||
| View original record | ORIGINAL To Da/Ev. From Hs. C. to By. Hs.1/MJ.13.10.30. x5260. 18-G4. With reference to Da/Ev2/M10.10.30. We are arranging to carry the bonnet over the dashboard as on Phantom 11 N.2 Series. We do not… | ||
| Scan114 | Sixth Brooklands report on a series of tests on six different types of radiator core. | ||
| View original record | ORIGINAL. To R. from Ha/ c. SS. c. NOT. E. c. Da. Ey. Ha/ml/AD14.10.30. XJ250 X766 X788 SIXTH BROOKLANDS REPORT. We have now completed a series of tests on six different types of radiator core. We… | ||
| Scan115 | Tests of different radiator tube designs to improve cooling efficiency. | ||
| View original record | -2- Hs/Ad/A.14.10.30 contd. 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… | ||
| Scan116 | Continued analysis of radiator tube efficiency, including a review of different tube types and the Gallay radiator. | ||
| View original record | -3- HM/AR/A24.10.30 contd. At higher speeds, however, the difference becomes appreciable, presumably due to the greater free air area of the square tube. (4) 5½/7 Round Tubes. These results again… | ||
| Scan117 | Comparison of radiator tube designs, including a sample from Rolls-Royce of America, and their impact on cooling efficiency. | ||
| View original record | HS/ml/A14.10.30 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 the… | ||
| Scan118 | 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 BRAKED TO MAINTAIN REQ'D SPEED. ALL CLOSED. LOUVRED BONNET. 30 M.P.H. 45 M.P.H. 30… | ||
| Scan119 | Performance comparison of different types of radiator tubes tested on a 19EX car at Brooklands track. | ||
| View original record | FIGURES GIVEN ARE CRITICAL ATS TEMP AT WHICH THE CAR WILL EVENTUALLY BOIL IF DRIVEN SUFFICIENTLY LONG DETAILS OF RADIATORS TABLE DATA: COLUMN HEADERS: - TYPE OF RADIATOR TUBES - 60 M.P.H NO BONNET… | ||
| Scan120 | Graph plotting hydraulic restriction characteristics of a parallel square tube radiator against engine RPM. | ||
| View original record | HYDRAULIC RESTRICTION OF [] TUBE RADIATOR RAD. E. 77675 TUBES E. 81385 6 m/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… | ||
| Scan121 | Blank document page with a purple ink date stamp from the Print Room. | ||
| View original record | ROYCE, LIMITED PRINT ROOM, 14 OCT 1930 DERBY | ||
| Scan122 | Graph plotting water flow tests against water temperature for a P.I. No 7 unit standard radiator. | ||
| View original record | WATER FLOWS TESTS ON P.I. No 7 UNIT. STANDARD RADIATOR (E.77675) OFF PRODUCTION STANDARD CIRCULATION 2500 R.P.M. 3000 R.P.M. CIRCULATION UNDER 4 LBS/D" PRESSURE. R.P.M. 2500 3000 DELIVERY GALLS / MIN.… | ||
| Scan123 | Stamped by the Print Room in Derby. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM, 14 OCT 1930 DERBY. | ||
| Scan124 | Experimental findings on the performance of tungsten contact points and related condenser capacity. | ||
| View original record | To R. from EFC. c. Sg. c. WOR. E. c. Da. Ev. ORIGINAL EFC3/AD14.10.30. X.2894. PERFORMANCE OF TUNGSTEN CONTACT POINTS. Arising out of one or two minor complaints which have been received on the… | ||
| Scan125 | Ignition distributor condenser capacity, materials, and performance after a 10,000-mile test. | ||
| View original record | SPC3/AMB4.10.30 contd. -2- of the benefit derived from the scrubbing action of the points, but that together with that scrubbing action this reduced capacity contributes considerably to good… | ||
| Scan126 | Test report on distributor point oxidation, examining the effects of varying condenser capacities. | ||
| View original record | -3- EFC3/AHL4.10.30 contd. condenser to a distributor unit in which the screw point was badly oxidised during previous standard tests. In the words of my assistant's report WL.51 :- "The distributor… | ||
| Scan127 | Test results for lower capacity condensers on 20/25 HP and Phantom II chassis to address misfiring. | ||
| View original record | -4- EFC3/A114.10.30.contd. two chassis besides 24-EX, one a 20/25 HP. chassis, the points on which were unoxidized, the condenser capacity being .27 mf. i.e. slightly lower than the present lowest… | ||
| Scan128 | Experiments investigating flywheel vibrations on a 25 HP engine. | ||
| View original record | To R. From Hs/GR. c. to SG. Wor. c. to E. Da. c. to EY. ORIGINAL Hs/GR.1/MJ.20.10.30. x634. x5300. FLYWHEEL VIBRATIONS ON 25 HP. -------------------------------- Continuing our report… | ||
| Scan129 | Investigation into flywheel vibrations by systematically isolating components to determine the source. | ||
| View original record | (1) Having previously found that the flywheel vibrations could be eliminated by a straight through drive from crankshaft to gearbox we tried to remove its constraining influence by inserting rubber… | ||
| Scan130 | Experiments to diagnose flywheel and crankshaft vibrations, including specifications for a standard flywheel and clutch. | ||
| View original record | (2) To make sure that the flywheel vibrations are not due to proximity of the master torsional period we towed the car with the valve gear missing. The engine was quite smooth after the flywheel… | ||
| Scan131 | Results of radiator tests comparing different tube and bonnet designs. | ||
| View original record | ORIGINAL. To R. From Hs/Rm. c. to SS. HOY. c. to E. De. c. to RV. Hs/Rm/MJ. 20.10.30. X. 766. X. 7250. X. 5250. RADIATOR TESTS. ---------------------------- We have now confirmed the results obtained… | ||
| Scan132 | Comparison of square versus round radiator tubes for performance and cost. | ||
| View original record | -2- we use 7 m.m. square tubes expanded horizontally only, and arranged with bilges for turbulence we shall have a radiator that is about 10° C. better than our present standard and one that will not… | ||
| Scan133 | Table comparing critical atmospheric overheating temperatures for different radiator types 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.61385. 30.25 34.0°C. 42. 33 6/7½ mm. Turbulent Flow Tubes.… | ||
| Scan134 | Inspection and test report on a Delco-Remy combined ignition distributor and contact breaker unit. | ||
| View original record | To R. from EFC. c. Sg. c. E. Ry. ORIGINAL EPCL/AD20.10.30. X.4284. DELCO-REMY IGNITION DISTRIBUTOR AND CONTACT BREAKER UNIT. We recently obtained an up-to-date Delco-Remy combined ignition distributor… | ||
| Scan135 | Inspection and bench test report for a Delco-Remy Ignition Distributor. | ||
| View original record | COPY. WE.52. DELCO-REMY IGNITION DISTRIBUTOR. We have inspected and bench tested an up-to-date Delco-Remy distributor obtained from the makers. This distributor is thoroughly representative of… | ||
| Scan136 | Analysis of a Delco-Remy dual contact breaker distributor assembly. | ||
| View original record | -2- To accurately time the two levers in relation to one another there is a similar arrangement whereby one of the breakers complete can be moved about the cam as centre, the other breaker being… | ||
| Scan137 | Description of the contact breaker, auto-advance mechanism, and distributor assembly. | ||
| View original record | -3- By removing two screws the whole contact breaker unit can be detached leaving the cam and the auto-advance mechanism in position. A long plain bearing, grease cap lubricated, supports the… | ||
| Scan138 | Examination of a distributor's contact points and head after a bench test. | ||
| View original record | -4- piercing the rubber insulation. A moulded cap also provided with corresponding grooves is then screwed down over the wires. This arrangement allows all the wires to come out from one side of the… | ||
| Scan139 | Distributor performance with a Delco-Remy coil and their method of riveting tungsten points. | ||
| View original record | -5- with 100% bedding. It may be the case that running the distributor with its own Delco-Remy coil would improve the contact point performance and we are accordingly running the distributor again… | ||
| Scan140 | Tests conducted on thermostats for 40/50 models, comparing different fillings and their effect on running temperatures. | ||
| View original record | To R. From Hs/Rm. c. Sg. c. Wor. E. c. Da. By. ORIGINAL THERMOSTATS. 40/50. We have conducted tests on thermostats filled with liquids having a lower vapour pressure than standard. The calorstat we… | ||
| Scan141 | Continuation of a report on shutter bearing loads, thrust, and pull during travel. | ||
| View original record | -2- shutter bearing, this should be adequate for all conditions. It should be noted that the loads are higher for the "starts to open" position than those we measure at .250 travel. I.E. The thrust at… | ||
| Scan142 | Chart and graph detailing the operating characteristics of different thermostat-operated shutters. | ||
| View original record | THERMOSTAT OPERATED SHUTTERS PII TABLE: TYPE OF THERMOSTAT | MEAN RUNNING TEMP. | STARTS TO OPEN | STARTS TO CLOSE | FULL OPEN | FULL CLOSED STANDARD | 55* | 56° | 58° | 61° | 48° SPECIAL A | 62* |… | ||
| Scan143 | Tests conducted on the Phantom II carburetter silencer to address excessive noise. | ||
| View original record | To R. FROM Hs/AJL. c. to AL. HOR. c. to L. Da. c. to Ey. PHANTOM II CARBURETTER SILENCER. We have carried out a series of tests to determine the degree of silencing necessary on the Phantom II… | ||
| Scan144 | Alterations to a carburetter silencer to improve silence and regain power, including performance test results. | ||
| View original record | -2- tube 94%. Two further alterations are carried out, (1) two layers of 20 mesh wire gauze are wrapped round the innermost baffle tube; this does not give any appreciable power drop but improves the… | ||
| Scan145 | Table comparing lap speeds in M.P.H. for various carburettor and air silencer test configurations. | ||
| View original record | -3- Hs/JL.1/AL.26.10.30.Contd. CONDITION OF TESTS. LAP SPEED M.P.H ------------------- --------------- Complete Silenced Carburetter. 77.5 Standard Carburetter (off 19-EX.). 78.43 Silenced Carburetter… | ||
| Scan146 | Air silencer and carburettor performance, detailing maximum speed and acceleration tests on car 19-EX. | ||
| View original record | -4- Hs/ALL.1/BL.22.11.30.Contd. If the two outer tubes are taken off and replaced by an air maze ( in this case the air valve relief holes are deleted on account of noise), we regain .4 M.P.H. at the… | ||
| Scan147 | Test results and a proposal to adopt an air silenced carburettor as standard for Phantom II cars. | ||
| View original record | -3- Hs/A.L.1/T.L.22.10.30.Contd. no loss when accelerating from 10 to 30 M.P.H.; from 30 to 60 M.P.H. there is a loss of only .6 seconds. All results are the mean of three separate tests. The… | ||
| Scan148 | Page detailing the function of baffles in preventing dust from entering the carburetter. | ||
| View original record | -6- Hg/AL.1/ML.22.11.32.Contd. stop what little dust can pass through the three outer baffles from being drawn into the carburetter. Hg/AL... | ||
| Scan149 | Graph comparing engine Brake Horsepower (BHP) against RPM for different carburetter configurations. | ||
| View original record | AIR SILENCED CARBURETTER STANDARD EXHAUST SYSTEM. BHP 110 100 90 80 70 60 50 40 30 STANDARD CARBURETTER:- COMPLETELY SILENCED CARB. AIR VALVE RELIEF HOLES IN COMPLETELY SILENCED CARB ENGINE R P M 1000… | ||
| Scan150 | Blank document page with a purple ink stamp from the Print Room. | ||
| View original record | ROLLS-ROYCE LIMITED PRINT ROOM 22 OCT 1930 DERBY. | ||
| Scan151 | Investigation into customer complaints regarding hydraulic shock absorber maintenance, specifically knocking and slack links. | ||
| View original record | To R. From Hs/Ra. c. to Sg. Wor. c. to Rs. E. c. to By. ORIGINAL Hs/Ra.1/MJ.25.10.30. x7520. x5520. SHOCK ABSORBER MAINTENANCE. We have been investigating the causes of the 202 hydraulic shock… | ||
| Scan152 | Causes and solutions for knocking sounds, focusing on pin wear, connecting tubes, and choked air vents. | ||
| View original record | -2- Hs/Sa.1/AL.25.10.30. Contd. that the pin becomes uncovered as soon as the oil level falls. This pin wear is perhaps largely responsible for the big percentage of Phantom 11 knocks reported. Slack… | ||
| Scan153 | Continued report on damper issues, focusing on oil leaks and instances of maltreatment by chauffeurs. | ||
| View original record | -3- Hs/Em.1/HU.25.10.30.Contd. in the frame which has been traced to coachbuilders slacking them off to fit their wing stays. This of course is likely to lead to broken damper feet etc. Generally… | ||
| Scan154 | Summary of customer complaints regarding damper leaks and knocking, with proposed design changes. | ||
| View original record | -4- Generally speaking the dampers are free from leaks at the glands. It will be observed that there were only 14 cases of oil leaks reported in the last six months so that this trouble is hardly in… | ||
| Scan155 | Continued memo discussing the investigation of issues with shock damper arms and 'mysterious knockers'. | ||
| View original record | -5- Hs/Rn.1/MJ.25.10.30.Contd shorter shock damper arms. We are also trying to get hold of the small proportion of "mysterious knockers" which we believe exist to see if there is a source of trouble… | ||
| Scan156 | Tests and improvements on various car components. | ||
| View original record | To Ds. From Hs. & to R. c.c. to Sg. c. to Wor. ORIGINAL Hs/Rm.1/AD27.10.30. EXPERIMENTAL REPORTS. With reference to Da3/M22.10.30. (1) Locomotive type brake shoe on the front brakes. These have been… | ||
| Scan157 | Continued memo discussing making tests on the standard clutch. | ||
| View original record | -2- Hs/Rn.1/AD27.10.30.Contd. however, why it should not be useful with the standard clutch. We will make tests accordingly. Hs/Rn. | ||
| Scan158 | Testing and standardisation of an improved moulded Dagenite vent for the Standard Phantom II battery. | ||
| View original record | To R. from EFC. c. Sg. c. Wox. E. c. Da. Ry. X.7535. IMPROVED FORM OF VENT FOR STANDARD PHANTOM II BATTERY. It was stated in our EFC9/AD9.7.30 that the P & R Co. had submitted to us for test an… | ||
| Scan159 | Test on flywheel vibrations and deflection for a 25 HP engine. | ||
| View original record | To R. From Hs/Ru. c. to SS. Wor. c. to E. Da. c. to HY. ORIGINAL x5300. x634. FLYWHEEL VIBRATIONS. 25 HP. The attached test has been carried out to ascertain the amount of deflection which takes place… | ||
| Scan160 | Test report on flywheel deflection under various loads for a 20 HP engine. | ||
| View original record | 20 HP FLYWHEEL DEFLECTION TESTS. LOAD APPLIED TO LEVER 3 FT. LONG ATTACHED TO FLYWHEEL BY SPRING CARTRIDGES THE EFFECTIVE WT. OF LEVER = 4 LB. THE CLOCKS WERE SET AT ZERO WITH THE LEVER IN POSITION, &… | ||
| Scan161 | The inspection and testing of a 48 coil high output dynamo from chassis 23-EX. | ||
| View original record | To R. from EFC. c. Sg. c. Wor. E. c. Da. Ey. EFC2/AD3.11.30. X.6006. 48 COIL HIGH OUTPUT DYNAMO I.O.I.M. AX CHASSIS 23-EX. This dynamo is the machine which satisfactorily passed the 10,000 mile test… | ||
| Scan162 | Potential purchase of a Maybach car to inform the development of a twelve-cylinder engine. | ||
| View original record | To E. From Hs/Rn. Hs/Rn.12/MJ.3.11.30. Attached is a note from Barkers. We discussed the question of purchasing the Maybach with Hs. and Sg. a week ago. Sg. said that R's enthusiasm for the purchase… | ||
| Scan163 | Potential solutions for vibrations in the 25 HP engine, including crankshaft counter-weights and a single-piece crankcase/block. | ||
| View original record | ORIGINAL To R. From Hs/Ru. c. to Sg. WOr. c. to E. DA. c. to BY. Hs/Ru.2/MJ.5.11.30. 25 HP. VIBRATIONS. x.634. x.5300. The difference between a normal crankshaft and a plain bar is so great that we… | ||
| Scan164 | Experiments conducted to investigate 25 HP engine vibrations. | ||
| View original record | To R. From Hs/GR. c. to Sg. Wor. c. to E. Da. c. to Ey. Hs/GR.1/MJ.5.11.30. 25 HP. VIBRATIONS. Continuing our report Hs/GR.1/MJ.20.10.30., we have made the following further experiments- (1)… | ||
| Scan165 | Analysis of engine and flywheel vibrations through a series of component tests on crankshafts and flywheels. | ||
| View original record | -2- finished at 3500 R.P.M. At 4200 R.P.M. a very considerable noise was experienced which shook the engine mountings. We therefore consider that the crankshaft is the cause of our 'flywheel… | ||
| Scan166 | The disturbing factor of 'long couples' in a six-cylinder crankshaft. | ||
| View original record | -3- Hs/GR.1/HL.5.11.30.Contd. the disturbing factor being the "long couples" that exist in a six cylinder crankshaft. Hs/H. Grylls. | ||
| Scan167 | Results of radiator tube tests conducted at Brooklands. | ||
| View original record | To R. From Hs/Rn. c. to Sg. Wr. c. to E. Da. c. to Ry. RADIATOR TESTS. We have carried out further radiator tests on Brooklands. Since the latest 6 mm. square tubes E.81393 expanded horizontally only… | ||
| Scan168 | Use of wind tunnels for obtaining test results and continuing investigations on turbulence. | ||
| View original record | -2- Hs/Bn.1/M7.6.11.30.Contd. economical way of getting results during the winter would be by means of a wind tunnel. We think that we have sufficient full scale results to be able to interpret wind… | ||
| Scan169 | Flywheel vibration test data for a 25 HP engine, detailing deflection measurements under increasing loads. | ||
| View original record | ORIGINAL To R. From Hs/Sn. c. to Sg. Wor. c. to E. Da. c. to Ey. Hs/Ra.2/MJ.6.11.30. X634. X5300. FLYWHEEL VIBRATIONS. 25 HP With reference to Hs/Sn.3/MJ.31.10.30. Herewith figures taken with the… | ||
| Scan170 | Data table of deflection measurements in inches for No. 6 crank at Top Dead Centre under varying loads. | ||
| View original record | -2- NO. 6 CRANK AT T. D. C. | LOAD ON LEVER-LB. | DEFLECTION INS. | | | | |---|---|---|---|---| | | Clock A. | Clock B. | Clock C. | Clock D. | | Zero. | Zero. | Zero. | Zero. | Zero. | | 20 | .003 |… | ||
| Scan171 | Blueprint showing a dimensioned lever arm attached to a No. 6 bearing assembly. | ||
| View original record | E N°6 BRG 5.260 4.910 3 FT A B C D 6.000" .250" .750" 7.060 8.060 WLB DIMENSIONS MEASURED OFF ARRGT DRG G.53692 ROLLS-ROYCE, LIMITED PRINT ROOM, 7 NOV 1930 | ||
| Scan172 | The Alfa Romeo and Aston-Martin vehicles at the 1930 Motor Show. | ||
| View original record | TO R. From HS/IAL. c. to Sg. MOT. c. to E. RS. c. to EV. HS/IAL.1/MJ.6.11.30. 8631 X4482 THE MOTOR SHOW 1930. ALFA ROMEO. 1750 c.c. Six Cylinder Supercharged. The braking is 75% on the front 25% on… | ||
| Scan173 | Notes on engine balance, dual ignition systems, and different types of petrol pumps. | ||
| View original record | -2- He/IA../1/AL.6.11.30.Contd. vertical out of balance from 3000 R.P.M. to 6000 R.P.M. Both this car and the Lorraine have a bearing each side of the flywheel. ------------------------- GENERAL… | ||
| Scan174 | Cutaway diagram illustrating the components of the S.U. Co.'s Kent fuel pump. | ||
| View original record | PETROL OUTLET NON-RETURN VALVE DISC VALVE PETROL PISTON RETURN SPRING FILTER PETROL INLET OIL INLET SLEEVE OIL OUTLET OIL PISTON RETURN SPRING SPRING RETAINING WASHER S.U. Co.'s Kent fuel pump. | ||
| Scan175 | Descriptive document with a diagram of the S.U. Hydraulic Fuel Pump and its operation. | ||
| View original record | The S. U. Hydraulic Fuel Pump provides one of the cheapest and most adaptable means of transferring petrol from petrol tank at the rear to the carburetter. It consists of a small reciprocating plunger… | ||
| Scan176 | Investigation into a 'boom' noise on Phantom II models at 60 M.P.H. | ||
| View original record | To R. From Hs. c.c. to Wor. Sg. c.c. to S. Da. c. to Ey. Hs/TAL.1/MJ.10.11.30. x181. x7770. BOOMS - PHANTOM II. Many Phantom II's have complaints of a 'boom' at 60 M.P.H. (i.e. 2250 R.P.M.)… | ||
| Scan177 | Test report detailing efforts to resolve a 'boom' or vibration issue by modifying engine mountings. | ||
| View original record | -2- HS/IALL/STC.11.36 contd. was a definite alteration in the boom. The boom now was almost cleared on the forward up to 70 m.p.h. (2620 r.p.m.) but was present from this to the maximum speed. On the… | ||
| Scan178 | Investigating engine 'boom' noise by modifying the exhaust manifold and concluding vibration is the root cause. | ||
| View original record | -3- we now thought that having improved the boom a lot by engine mountings, the remainder might be exhaust. Three restriction baffles were fitted between the cylinder head and exhaust manifold. These… | ||
| Scan179 | Clearance for the Phantom II scuttle isolation. | ||
| View original record | ORIGINAL To Da/Ev. From Hg/Rm. c. to By. Hg/Rm.5/MJ.11.11.30. x4613 PHANTOM II SCUTTLE ISOLATION. With reference to Da/Ev2/M7.11.30. As far as our experience goes 1/4 is sufficient clearance between… | ||
| Scan180 | Cover note for a report detailing difficulties experienced while testing the Salerni Coupling, deeming it impractical. | ||
| View original record | ORIGINAL To R. From Hs/Rn. c.c. to Sg. MGr. c.c. to Da. E. c.c. to By. Hs/Rn.1/AJ.11.11.30. X4510. The attached report shews the difficulties we have experienced while testing the Salerni Coupling.… | ||
| Scan181 | Review of the operation of the Salerni coupling device on RAC.7. | ||
| View original record | To R. From Hs/GR. c.c. to SG. Wor. c.c. to Da. E. c.c. to By. Hs/GR.1/MJ.11.11.30. SALERNI COUPLING ON RAC.7. Briefly reviewing the operation of this device. The coupling itself consists of three… | ||
| Scan182 | The operation of a clutch and gearbox system, including gear changes and starting procedures. | ||
| View original record | -2- from rest except by holding the gear lever against the gear while pressing the clutch pedal. This may shift Y into a position for engagement. Starting from rest. A gear having been engaged by (1)… | ||
| Scan183 | Gear engagement difficulties related to the Salerni coupling and cone brake. | ||
| View original record | -3- both the third and first motion shafts and any gear can be engaged. This does not always happen because of the Salerni coupling not being fully engaged before commencing to change of gear. Under… | ||
| Scan184 | Blueprint diagram of a Salerni coupling in its free-wheeling position. | ||
| View original record | SALERNI COUPLING IN FREE WHEELING POSITION SLIDING MEMBER ON 3RD MOTION SHAFT FIXED MEMBER SPLINED ON PROP: SHAFT SYNCHRONISER RING FLOATS FREELY ON SLIDING MEMBER X Y Z P | ||
| Scan185 | Largely blank document page with a purple ink date stamp in the bottom right corner. | ||
| View original record | LIMITED ROOM, 11 NOV 1930 ERBY. | ||
| Scan186 | The standardisation and endurance testing of Watford Type LW6A magnetos with tungsten points. | ||
| View original record | R. from EFC. c. Sg. c. Wor. E. c. Da. RV. X.7792. EFC2/ADL 2.11.30. WATFORD TYPE LW6A MAGNETOS WITH TUNGSTEN POINTS. Standardisation of the above magnetos is now completed and these machines are about… | ||
| Scan187 | The electrical performance testing of magnetos, comparing tungsten and platinum points. | ||
| View original record | EFC2/AH.2.11.30 contd. -2- Upon testing the electrical performance on the bench we found this to be practically unimpaired. The low speed figures obtained were 85 r.p.m. in the advanced position. 110… | ||
| Scan188 | Proposed experiments on the Salerni coupling and Maybach clutch for project EAC.7. | ||
| View original record | ORIGINAL To DA. From Hs/GR. Hs/GR.1/MJ.18.11.30. x4510. SALERNI COUPLING ON EAC.7. Replying to your Da3/M15.11.30. We will carry out as soon as possible the experiments you suggest. (1) Increase the… | ||
| Scan189 | Tests on the Phantom II suspension system and its rebound characteristics. | ||
| View original record | To R. from Hs/Rm. c. SG. c. Wor. Dn. c. E. Ev. ORIGINAL Hs/Rm2/ATL8.11.30. X7410 PHANTOM II SUSPENSION With reference to the attached tests. The amount the rebound can be restrained must depend… | ||
| Scan190 | Preliminary tests on restraining the rear axle movement for the Phantom II suspension. | ||
| View original record | To. R. From Hs/AJL. c. to SG. Wor. c. to Da. E. c. to Hy. PHANTOM II SUSPENSION - REAR AXLE MOVEMENT. We have carried out some preliminary tests to demonstrate the effect of restraining the rear axle… | ||
| Scan191 | Tests of different sling lengths and their effect on buffer clearance and axle movement. | ||
| View original record | -2- Hs/AJL.1/HJ.17.11.30.Contd. 13.8". Several different lengths of sling were tried, tests being made over rough roads, main roads, and humped back bridges. The minimum reasonable buffer clearance on… | ||
| Scan192 | Tests and opinions on road springs for the Phantom II Flexible model. | ||
| View original record | ORIGINAL. To R. From Hs/Rm. c. to Sg. WOP. E: EB Ry: Er. PHANTOM II FLEXIBLE ROAD SPRINGS. We have ordered road springs to the deflections you suggest i.e. front 4.00".. rear 9.00". We have been doing… | ||
| Scan193 | Customer issues with shock absorbers in the U.S.A. and a comparison with Delco alternatives. | ||
| View original record | To R. From Hs. (In U.S.A.) c. to Ss. for. c. to E. Da. c. to Ev. 18.11.30. - Hs.1. x837. x7520. SHOCK ABSORBERS. The trouble with shock absorbers here is worse than in England. The people at… | ||
| Scan194 | Feedback and test results for car 25-EX in the U.S.A. after 1900 miles. | ||
| View original record | ORIGINAL To R. From Hs. (In U.S.A.). c. to EG. Mor. c. to B. Ds. c. to Ry. 18.11.30. - Hs. 2. x7941d. 25-EX. IN U.S.A. This car has now completed about 1900 miles. Today at Springfield we have had a… | ||
| Scan195 | Comparative analysis of steering, springing, and acceleration performance, with proposed improvements and criticisms. | ||
| View original record | -2- (1) Steering. The steering on this car is wonderfully light, lighter than our average cars. There is, however, a fair movement of the wheel over a bad road more than on the Springfield cars with… | ||
| Scan196 | Amount of rebound restraint for the Phantom II suspension. | ||
| View original record | To R. from Hs/Rm. c. Sg. c. Wor. Da. c. L. Ev. ORIGINAL Hs/Rm2/ADL8.11.30. X7410 X7350. PHANTOM II SUSPENSION With reference to the attached tests. The amount the rebound can be restrained must depend… | ||
| Scan197 | On preliminary tests for the Phantom II suspension, specifically concerning rear axle movement on rebound. | ||
| View original record | To. R. From Hs/AJL. c. to Eg. Wor. c. to Ds. E. c. to By. PHANTOM II SUSPENSION - REAR AXLE MOVEMENT. We have carried out some preliminary tests to demonstrate the effect of restraining the rear axle… | ||
| Scan198 | Road tests investigating different sling lengths and their effect on buffer clearance and axle movement. | ||
| View original record | -2- Hs/AJL.1/HL.17.11.30.Contd. 13.8°. Several different lengths of sling were tried, tests being made over rough roads, main roads, and humped back bridges. The minimum reasonable buffer clearance on… | ||
| Scan199 | The collection and renovation of experimental cars 27-EX and 18-EX. | ||
| View original record | ORIGINAL To R. From Hs/Rm. c. to Sg. Hs/Rm. 5/MJ.19.11.30. X8997 27-EX. R's Car For South of France. With reference to R.1/MJ.17.11.30. We will arrange to collect 18-EX. when we are at W.W. next week.… | ||
| Scan200 | Cause and cure for spitting in the silencer, particularly on Phantom 1 cars. | ||
| View original record | ORIGINAL To R. From Ha/AJL. c. to SE. HOr. c. to Ds. c. to HY. Rs/AJL.1/MJ.20.11.30. X7230. X5230. SPITTING IN THE SILENCER. We are continually working to find the cause and cure for spitting in the… | ||
| Scan201 | The effects of a low speed choke tube on engine spitting and carburation. | ||
| View original record | -2- Hs/AIL.1/ML.30.11.30.Contd. by using a low speed choke tube .100" smaller on all its internal dimensions. This was fitted on a car which was bad for spitting in the silencer even after all the… | ||
| Scan202 | Further tests investigating an engine spitting issue on car 22-EX. | ||
| View original record | -3- Hs/A.L.1/M.L.20.11.30.Contd. are obtaining some more so that we can get further experience. So far on 22-EX. we can find no disadvantage. Bench tests are beings carried out in parallel to confirm… | ||
| Scan203 | Tests conducted to eliminate engine vibrations in 20/25 HP cars. | ||
| View original record | To R. From Hs. c.c. to SS. c.c. to DA. c.c. to EY. ORIGINAL Hs/AJL.1/WJ.21.11.30. 15005 1634 20/25 HP. CAR ENGINE VIBRATIONS. We have carried out tests to try to eliminate the engine boom which are… | ||
| Scan204 | Proposal to standardise Cotton 'A' fabrics for torque reaction dampers on 20/25 HP cars. | ||
| View original record | -2- Hs/AJL/BL.21.11.30.Contd. best load being 8 lbs. measured at the end of the long arm. The effect of soaking in oil is to provide a more constant slipping load. When setting the load on dampers it… | ||
| Scan205 | Drawing of a Torque Reaction Damper for a 20/25 HP model. | ||
| View original record | TORQUE REACTION DAMPER 20/25 HP B DISTANCE PIECE (A) 8lbs LOAD INT ROOM, 21 NOV 1930 | ||
| Scan206 | Experiments conducted to investigate vibrations in a 25 HP unit. | ||
| View original record | To R. From Hs/GR. c.c. to Sg. Mor. c.c. to A. Da. c.c. to By. Rg. Hs/GR.1/MJ.21.11.30. x634. x5300. 25 HP. VIBRATIONS. Continuing our report Hs/GRL/MJ.5.11.30., we have made the following further… | ||
| Scan207 | Experiments to analyze engine vibrations on a 25 HP model. | ||
| View original record | 25 HP. VIBRATIONS. (1) With the car fitted with a bare 2" pin crankshaft, flywheel (no clutch parts) and straight through drive, we found that vibrations started at 2800 R.P.M., getting worse at 3100… | ||
| Scan208 | Analysis of crankcase and bearing cap distortion, concluding on the importance of assembly rigidity. | ||
| View original record | -2- To decide whether this deflection was due to the bolts bending, we arranged to measure the angular distortion of the crankcase bearing housing by a clock at Y in the sketch. We then noted that the… | ||
| Scan209 | Graph showing crankcase and flywheel deflections for a 25 HP engine. | ||
| View original record | 25 HP CRANKCASE AND FLYWHEEL DEFLECTIONS Left Graph: Y-Axis: 1/10000 RADIANS or 1/1000" AT 10" RAD Axis Values: 0, 5, 10, 15 X-Axis: LOAD AT 39" RAD LBS Axis Values: 0, 50, 100 Line (Z): BRG. CAP (X)… | ||
| Scan210 | Blank or illegible document page with a purple ink stamp in the bottom right corner. | ||
| View original record | S...T ROOM, 21 NOV 1938 DERBY. | ||
| Scan211 | Alterations and testing of starting carburetters with fixed maximum restriction. | ||
| View original record | To R. From Hs/AJL. c. to SE. Wor. c. to Da. E. c. to BY. Hs/AJL.3/MJ.21.11.30. x7-80. STARTING CARBURETTERS WITH FIXED MAXIMUM RESTRICTION. ------------------------ In hs/AJL.1/MJ.14.5.30. we asked… | ||
| Scan212 | New lubrication scheme for Phantom II front shock absorbers. | ||
| View original record | To R. from Hs/Sm. C.c. RG. C.c. HOF. De. ORIGINAL. Hs/SmS/A724.11.30. x7520. P.11. FRONT SHOCK ABSORBERS. We have tried out the scheme of lubricating the pin on the front shock damper arm by means of… | ||
| Scan213 | Springing and suspension tests on a Phantom II car using a water spilling method to measure riding comfort. | ||
| View original record | ORIGINAL To R. From Hs, /AJL. c.c. to Ss. OR. c.c. to Ds. E.P. c.c. to HY. E.P. c.c. to Hd. GW. Hs/AJL.1/WJ. 26.11.30. X7410 SPRINGING - PHANTOM 11. We have carried out some tests on a Phantom 11 car… | ||
| Scan214 | Effects of damping, weight distribution, and seating on vehicle pitching and ride comfort. | ||
| View original record | -2- and above this speed the discomfort increases. The peak indicated at 40 M.P.H. is due to pitching. These general features were prominent on tests carried out on several roads when looking for a… | ||
| Scan215 | Analysis of passenger discomfort and recommendations for improving riding comfort through changes in body design, weight distribution, and damping. | ||
| View original record | -3- Hs/AEL.1/ML.26.11.30.Contd. necessary to take into account the degree of discomfort registered by a passenger as compared with that shewn on the graphs. For instance an increase of say fifty… | ||
| Scan216 | Graph showing the effect of shock damping on rear seat riding comfort at different road speeds. | ||
| View original record | SPRINGING TESTS. 20 EX. TICKNALL HILL. STANDARD SUSPENSION. THE EFFECT OF SHOCK DAMPING ON REAR SEAT RIDING COMFORT. STANDARD. No FRONT DAMPERS. No REAR DAMPERS. No DAMPERS. RIDING COMFORT (MEASURED… | ||
| Scan217 | Graph from springing tests on a 20 Ex model, showing the effect of weight distribution on rear seat riding comfort. | ||
| View original record | SPRINGING TESTS 20 Ex. TICKNALL HILL. STANDARD SUSPENSION. THE EFFECT OF WEIGHT DISTRIBUTION ON REAR SEAT RIDING COMFORT. RIDING COMFORT. (MEASURED BY WATER LOSS C.C's.) ROAD SPEED. (M.P.H.) LEGEND:… | ||
| Scan218 | Tests concerning high-speed engine roughness for the 25 HP model, specifically involving the flywheel and bearings. | ||
| View original record | ORIGINAL To R. From Hs/Ra. c. to Sg. Mor. c. to X. By. c. to Da. Rs. Hs/Rm.3/MJ. 28.11.30. X. 634. 25 HP. HIGH SPEED ENGINE ROUGHNESS. We have now repeated our tests on the flywheel having a tail… | ||
| Scan219 | Blueprint of a Tail Bearing for a 25 HP Flywheel. | ||
| View original record | TAIL BEARING, 25 H.P. FLYWHEEL WHITE METAL. | ||
| Scan220 | Almost illegible document with a purple 'PRINT ROOM' stamp. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM 28 NOV 1930 | ||
| Scan221 | Note received from H.S. in the U.S.A. regarding feedback on clutch performance and brake squeaks on car 25-KT. | ||
| View original record | COPY OF NOTE RECEIVED FROM HS. (IN U.S.A.). RECEIVED 22.11.30. X. 7941d. X. 4194. To R. c.c. S.E. Wor. L. Ds. E.W. My. CLUTCHES. The clutch on 25-KT has worked remarkably, there has not been the… | ||