Rolls-Royce Archives
| Identifier | Entry | ||
| scan0001 | Article discussing the theory and graphical representation of motor car acceleration. | ||
| View original record | THE AUTOCAR, September 14th, 1912. 489 The Acceleration of a Motor Car.* By H. E. Wimperis, M.A. THE acceleration of any given motor car at any moment depends primarily upon two factors—(1) the engine… | ||
| scan0002 | Analysis of motor car acceleration, comparing theoretical calculations with experimental data from accelerometer tests. | ||
| View original record | 490 THE AUTOCAR, September 14th, 1912. The Acceleration of a Motor Car. and then to compare the curves given by experiment with figs. 3 and 4. Two methods are in use for the measurement of car… | ||
| scan0003 | Article from 'The Autocar' magazine discussing the principles and conditions for ideal motor car acceleration. | ||
| View original record | THE AUTOCAR, September 14th, 1912. 491 The Acceleration of a Motor Car. one-third; this should not cause slipping if the clutch is let in gently, but with sudden starting the momentary acceleration… | ||
| scan0004 | Article from 'The Autocar' detailing R.A.C. horse-power tests conducted at Brooklands using a Wimperis accelerometer. | ||
| View original record | R.R. 285A (150 H) (S.A. 301. 19-2-15) G. 0950. THE AUTOCAR, September 28th, 1912. X1909 R.A.C. Horse-power Tests at Brooklands. The Wimperis Accelerometer in Conjunction with Accurate Timing and… | ||
| scan0005 | Article from 'The Autocar' magazine discussing brake horsepower tests, engine performance comparisons, and road surface improvements. | ||
| View original record | THE AUTOCAR, September 28th, 1912. 581 various sizes and makes. As previously mentioned, the b.h.p. figures are obtained from the formula B.H.P. = R x W x V ÷ 375 where R is the resistance to motion… | ||
| scan0006 | Axle modifications for The Earl of Rocksavage's new chassis to meet performance requirements. | ||
| View original record | AD. X1725 FN7/DN/28.8.22. 2 TO BP. c. to BJ. & Hs. FROM FN. X1725 X2565 X4299 Re The Earl of Rocksavage's new chassis. I have today had a further letter from this gentleman discussing acceleration and… | ||
| scan0007 | Test results and performance data for a 4-EX Saloon car on various hill climbs. | ||
| View original record | X1725 Mr. Hives. from GWH. 25.10.22. 4-EX Car. X3764 / X1725 Fitted with Saloon body - 15 X 52 axle ratio. Weight of car with two passengers - 2 tons 8 cwts. 1 qr. Tyre pressures - rear 65 lbs. front… | ||
| scan0008 | Conclusions drawn from the first tests on an accelerometer, evaluating its effectiveness on level ground versus on hills. | ||
| View original record | X1725 Hs. from - Rm. 20.12.22. CONCLUSIONS DRAWN FROM FIRST TESTS ON ACCELEROMETER. This is a non-recording instrument Readings on the level. The results obtained all tend to show that the… | ||
| scan0009 | Accelerometer test results for acceleration on various hills using different gears. | ||
| View original record | ACCELEROMETER TESTS 15.12.22. Acceleration on Hills as measured by Accelerometer. Top gear. Ashbourne hill - average reading 21-19 m.p.h. 2.2 ft.p.s² (1 in 13) Matlock Bank - " " 22-12 m.p.h. 2.3 (1… | ||
| scan0010 | Results of accelerometer tests, including tractive resistance and acceleration on level ground. | ||
| View original record | ACCELEROMETER TESTS. (P.M.) Tractive Resistance Tests. Results. Road slope 1 in 1000. Tests taken in pairs both ways 20 - 10 m.p.h. Mean Accelerometer reading (a) 24 lbs. per ton. (b) 24.5 " " " Mean… | ||
| scan0011 | Accelerometer and stopwatch tests for tractive resistance and acceleration. | ||
| View original record | Y1725 18.12.22. ACTUAL READINGS - ACCELEROMETER TESTS CHECKED BY STOP WATCH. Tractive resistance tests. Top gear 20/10 m.p.h. Ashbourne Rd. Very slight gradient. Down Up Mean Down Up Mean Time - 45… | ||
| scan0012 | Précis of an article on measuring chassis friction losses and wheel rolling resistance. | ||
| View original record | PRÉCIS OF ARTICLE ON CHASSIS FRICTION LOSSES. Journal of Automotive Engineers. Nov. 1922. Measurement of rolling resistance of wheel. Simplest method - Tow with spring balance. Disadvantages Slow… | ||
| scan0013 | Friction losses and the rolling resistance of fabric and cord tyres. | ||
| View original record | -2- (b) Friction losses due to engine vary directly as speed i.e., F at 20 m.p.h. = ½ F at 40 m.p.h. (c) At 20 m.p.h. Tr. resistance due to engine is almost equal to that of the chassis. Tyre… | ||
| scan0014 | Technical memorandum discussing the limitations and suitability of the Wimperis accelerometer for different applications. | ||
| View original record | To hs. from Rn. THE ACCELEROMETER. The Wimperis accelerometer appears to me to have been primariarly designed for use on a small firm, where apparatus for recording the performance of the chassis is… | ||
| scan0015 | The utility of an accelerometer for testing car performance on gradients compared to a recording Barograph. | ||
| View original record | -2- recording Barograph. In the former, an isolated observation loses more than half its value because its position with regard to the preceding and following readings is in no way indicated. The… | ||
| scan0016 | Cover page for a Wimperis Accelerometer brochure by Elliott Brothers. | ||
| View original record | Stop Watch RECEIVED NOV 14 1922 X1709 WIMPERIS ACCELEROMETER FOR STEAM AND ELECTRIC TRAINS ELECTRIC TRAMS MOTOR VEHICLES LABORATORIES Etc., Etc. ELLIOTT BROTHERS (LONDON) LIMITED. ESTABLISHED 1800… | ||
| scan0017 | Equilibristat diagram showing main line express train performance and oscillations at different speeds. | ||
| View original record | 39 M P H 25 26 27 2 4 75 130 160 200 400 22 42 150 110 47 1/2 M.P.H. 16 17 2 4 6 20 170 Fig. 7.—Equilibristat diagram.—Main line express. (The upper line gives speed in miles per hour. The line just… | ||
| scan0018 | The use of a Wimperis Accelerometer on railways. | ||
| View original record | WIMPERIS ACCELEROMETER 3 ON RAILWAYS It happens that at the present time two of the matters most prominently in the minds of Railwaymen, are— (1) The handling of Suburban Traffic. (2) The safety of… | ||
| scan0019 | The use of Wimperis Accelerometers for monitoring train safety on curves, with example acceleration graphs. | ||
| View original record | 4 WIMPERIS ACCELEROMETER THE SAFETY OF HIGH SPEED TRAINS WHEN ROUNDING CURVES The vital necessity of watching closely the effect of speed when rounding either long or short curves has been brought out… | ||
| scan0020 | Promotional and technical document for the Wimperis Accelerometer, detailing prices, users, operational principles, and a user testimonial. | ||
| View original record | 12 WIMPERIS ACCELEROMETER PRICES Recording Accelerometer ... £ s. d. 52. 0. 0. Paper ... per doz. rolls Ink ... per bottle Spare Pens ... each Indicating Accelerometer ... 9. 9. 0. Leather Case ...… | ||
| scan0021 | The principle of operation and usage instructions for the Wimperis Accelerometer. | ||
| View original record | 6 WIMPERIS ACCELEROMETER PRINCIPLE OF OPERATION The general nature of the internal mechanism may be described as a lop-sided copper disc, mounted on a vertical axis and controlled in its rotation by a… | ||
| scan0022 | Description of the Wimperis Accelerometer, its theory, and charts showing its use on a 15 HP touring car. | ||
| View original record | Page 10 WIMPERIS ACCELEROMETER [Chart showing two graphs of ACCELERATION IN FT. PER SEC.² over time in seconds] Fig. 8. The above charts of acceleration were taken with a Recording Accelerometer on a… | ||
| scan0023 | Explaining the use of the Wimperis Accelerometer for both railway and automobile applications. | ||
| View original record | 8 WIMPERIS ACCELEROMETER EQUILIBRISTAT USE For use as an equilibristat the instrument is so calibrated that each vertical division on the paper is equivalent to an excess, or deficiency as the case… | ||
| scan0024 | Tests to determine if a speedometer shows lag during vehicle acceleration. | ||
| View original record | X1725 15.1.23. TEATS CARRIED OUT (11.12.22) TO DETERMINE WHETHER SPEEDOMETER SHOWS ANY LAG IN FOLLOWING UP SPEED OR NOT. X1725 ~~X613~~ The object of these tests was to discover if accelerations, as… | ||
| scan0025 | Page outlining methods for calculating acceleration and velocity, both by time and by speedometer readings. | ||
| View original record | Methods of calculation. By TIME Let v = final velocity. Let f = acceleration. " u = initial velocity. " t = time. s = space passed over. Now initial velocity + accn. X time = final velocity } (i) i.e.… | ||
| scan0026 | Tests to determine if the speedometer shews any lag in following up increase of speed. | ||
| View original record | TESTS CARRIED OUT TO DETERMINE IF THE SPEEDOMETER SHEWS ANY LAG IN FOLLOWING UP INCREASE OF SPEED. Third speed. A. Readings. Start 10 m.p.h. Finish 28 m.p.h. Distance 177 ft. By time 3.85 f.p.s2 By… | ||
| scan0027 | Methodology for calculating acceleration and tractive resistance graphs for the 49-GB vehicle. | ||
| View original record | Hs. X1725 24.1.23. GRAPHS OF 49-GB. CUT-OUT CLOSED. The acceleration graph is calculated from a number of both-way readings with a speedometer that has been checked for lag. Tests were carried out by… | ||
| scan0028 | Report discussing engine power testing methods, specifically B.HP and I.HP graphs and mechanical efficiencies. | ||
| View original record | contd:- -2- the crown wheel and pinion a correction has been made for this. A correction has not, however, been made in this graph for the fact that the throttle was closed during the decelerations… | ||
| scan0029 | Series of performance graphs comparing Tractive Resistance, Acceleration, Horsepower and Efficiency for 6 EX and 4 G II models. | ||
| View original record | TOP HEADER: 6 EX OPEN TOURING 16x82. MEDIUM COMPRESSION. WT WITH PASSENGERS 2.15 TONS. ALL READINGS CUT OUT OPEN. 4 G II OPEN TOURING 13.60. WT WITH PASSENGERS 1.625 TONS. GRAPH A (TOP LEFT): Title:… | ||
| scan0030 | Series of performance data graphs for the 49 G.B. Open Touring Body vehicle. | ||
| View original record | Top Left Graph: HORSE POWER, R.P.M., I.H.P, B.H.P CLUTCH, B.H.P ROAD WHEELS DYNAMOMETER, B.H.P & I.H.P. Top Middle Graph: ACCELERATION IN F.P.SEC, SPEED IN MILES PER HOUR., ACCELERATION. Top Right… | ||
| scan0031 | Graph comparing the acceleration of three different vehicle configurations against road speed. | ||
| View original record | X1725 ACCELERATION TONS 4.G.II WT WITH PASSENGERS 1.625 6 EX " " " 2.15 I.G.I. " " " 1.4 ACCN. FT PER SEC: PER SEC. ROAD SPEED M.P.H. x 6.Ex. I G I 4 G II | ||
| scan0032 | Record of measurements between telegraph poles on the Shardlow straight from Derby to Shardlow. | ||
| View original record | X1725 RECORD OF TELEGRAPH POLES ON SHARDLOW STRAIGHT FROM DERBY TO SHARDLOW, STARTING AT THE FIRST SUPPORTED POST ROUND THE CORNER. 71 4/1428 35.7 28.5.37 ‡ 178 183 182 157 188 189 172 ‡ 157 180 177 ‡… | ||
| scan0033 | On road acceleration and tractive resistance tests to investigate car performance differences. | ||
| View original record | To R. from Hs. c. to CJ. c. to E. c. to Da. c. to BY. c. to EP. Handwritten: X1725 Hs4/LG2.3.23. ROAD ACCELERATION AND TRACTIVE RESISTANCE TESTS. Handwritten: X1725 X4578 We attach a report and… | ||
| scan0034 | Methodology for conducting road acceleration and tractive resistance tests. | ||
| View original record | 26.2.23. ROAD ACCELERATION AND TRACTIVE RESISTANCE TESTS. These tests were carried out under moderately favourable climatic conditions - there was, however, a gusty wind - all results are the average… | ||
| scan0035 | Page from a test report analyzing and comparing performance graphs for engine power, efficiency, and resistance. | ||
| View original record | contd:- -2- Fig.D. Shows the results of this correction and also a correction for the fact that in using the momentum of the car to turn the engine over, we transmitted the power via. the crown wheel,… | ||
| scan0036 | Report page comparing the mechanical efficiencies of two models and noting a drop in horsepower. | ||
| View original record | contd:- -3- From graph 'G', that the mechanical efficiencies of the two models are very much the same. Graph 'F' confirms the large drop between the clutch and road wheel H.P., and emphasises the need… | ||
| scan0037 | Topographical summary detailing the distances and contour heights of Hazel-wood Hill and Swinscoe Hill. | ||
| View original record | X1725 26.4.23. DETAILS OF HILLS. Y1725 / X4578 Hazel-wood Hill. 1st. edge boundry wood of The Knoll 300 ft. contour. .18 miles 350 ft. contour. .295 " 400 ft. contour. .350 " 450 ft. contour. .430 "… | ||
| scan0038 | Comparison of the climbing capabilities for the 40/50 HP and 20 HP models. | ||
| View original record | X488 To R. from Hs/Rm. c. to CJ. c. to E. c. to Da. c. to BY. c. to EP. c to Rt c to USA HsRm1/LG21.6.23. COMPARISON OF CLIMBING CAPABILITIES. X488 40/50 AND 20 HP. The equivalent gradient… | ||
| scan0039 | Comparison of climbing capabilities for 40/50 HP and 20 HP models. | ||
| View original record | COMPARISON OF CLIMBING CAPABILITIES 40/50 HP. and 20 HP. Guaranteed weights 39 and 55 cwts. Tyre dia's taken as 31.4 and 33 ins. ηP at rear wheels. 76 " 69 lbs.per sq.in. SPEED. | Gear Ratio. | Power… | ||
| scan0040 | Calculation of climbing capabilities for the 40/50 HP and 20 HP models. | ||
| View original record | CLIMBING CAPABILITIES - 40/50 HP. & 20 HP. Let d = dia. of cyl. (ins.) " S = stroke (ins.) " ηP = mean effective pressure (lbs.per sq.in.) " T = torque (ins.lbs.) Then in a 6-cyl. 4 cycle engine, work… | ||
| scan0041 | Page of calculations for power delivery, tractive resistance, and hill climbing for 40/50 HP and 20 HP models. | ||
| View original record | -2- Power delivered to rear wheels allowing for rear tyre losses and transmission losses :- 40/50 HP. = 54.8 X gear ratio. 20 HP. = 37.71 X " " Allowing 50 lbs. per ton as an average tractive… | ||
| scan0042 | Telegram received by telephone from Royce regarding a meeting in Chichester to test cars. | ||
| View original record | ROLLS-ROYCE, LIMITED. TELEGRAM RECEIVED BY TELEPHONE. Time Received: 5-40 Date: 2-7-23 By: W&C from: Chichester 5-10 Handwritten Reference: X2565 / X448 Message Text: Having if you have now six EX or… | ||
| scan0043 | Telegram received by telephone regarding a request for a 40/50hp car for photography and testing. | ||
| View original record | R.R. 144A (100B.) SE 867. 9.7.18 MP 193871 4488 ROLLS-ROYCE, LIMITED. TELEGRAM RECEIVED BY TELEPHONE. Time Received: 11-53 Date: 2-7-23 To: Royce By: W&A from: Chisleten 10-35 Message: Hives have you… | ||
| scan0044 | Outlining the procedure for a comparative cooling test between the 40/50 HP and 20 HP car models. | ||
| View original record | y488 To Hs. from Da/Ev. c. to CJ. BY. EP. Da/EV1/M16. 8. 23. RE. 40/50 & 20 HP. COOLING. X.766 X.488 X.1751. With a view to future design and improvements in car cooling we have made some comparative… | ||
| scan0045 | Instructions for modifications to the 40/50 and 20 HP radiator and water tank systems. | ||
| View original record | contd:- -2- (1) Standard 40/50. (2) Standard 20 HP. with louvres wide open (no thermostat tank). Then on the 40/50 we wish you to repeat it with the following modifications :- (a) The water inlet to… | ||
| scan0046 | Acceleration and pulling-up distance for a 6.EX type car. | ||
| View original record | To Hs. & EP. from R. X1725 R1/M28.8.23. X.1725 X.3923 X.718. Perhaps one of you could give the information to say in what distance a car of the type of 6.EX could be pulled up from 15, 20 and 26… | ||
| scan0047 | Acceleration and braking test results for the 6-EX car model. | ||
| View original record | To R. from Hs. c. to EP. x/725 Hs1/LG29.8.23. ACCELERATION & BRAKING ON 6-EX CAR. X.3923. X.1725 X.718. Acceleration on 6-EX car between 20 and 30 m.p.h. is 2.5 ft. per sec. The distance in which the… | ||
| scan0048 | Performance test results for Goshawk 11 on Pistern Hill with wet roads. | ||
| View original record | GOSHAWK 11. Xu88 1.11.23. PERFORMANCE TEST - PISTERN HILL. (roads wet) Start. | Max. m.p.h. | Min. m.p.h. | Finish m.p.h. | Time ---|---|---|---|--- 10 | 44½ | 24 | 32 | 1 min. 42½ secs. 10 | 45½ | 25… | ||
| scan0049 | Internal memorandum regarding the attachment of document Oy7-E-11623. | ||
| View original record | X1725 To Hs. from BJ. BJ/Py2/D19.11.23. I attach copy of Oy7-E-11623. Will you please reply direct sending us a copy for our files here. BJ/Py. Att: 1. | ||
| scan0050 | Copy of a letter from a traffic consultant requesting car acceleration data for a study on street intersection capacity. | ||
| View original record | Oy7-E-11623 November 6, 1923 Mr. Claude Johnson, Rolls-Royce, Ltd., London, England. (Copy for the attention of Mr. Hives) Dear Sir: Below we give you copy of letter received from Herbert S. Swan,… | ||
| scan0051 | Testing Hispano brakes on a car rolling backwards down a gradient. | ||
| View original record | 4488 (handwritten) CJ. from Hs. Hsl/LG30.1.24. HISPANO BRAKES. CJ5/E29.1.24. 4214 (handwritten) X1557 (handwritten) 4488 (handwritten) With reference to your request that we should test the Hispano… | ||
| scan0052 | Comparing the performance of RR and Hispano cars. | ||
| View original record | R.R. 403 (40 H) (SL 42 12-7-23). J.H., D. X488 EXPERIMENTAL REPORT. COPIES TO: R.CJ. BJ. WOR. By. E. Da. EP. PN. OY. Expl. No. 9940 4214 488 REF. HS2/LG5. 2. 24. OBJECT OF TEST. Comparison of RR. and… | ||
| scan0053 | The hill climbing performance of a 40/50 HP Landaulette in North Devon, with a comparison to a Hispano Suiza. | ||
| View original record | R.R. 403A (40 H) (SL 42 12-7-23). J.H., D. EXPERIMENTAL REPORT. Expl. No. REF. Hs/Rm/LG5. 2. 24. HILL CLIMBING PERFORMANCE - NORTH DEVON. The following hills were climbed by a 40/50 HP. Landaulette,… | ||
| scan0054 | Braking tests conducted in North Devon on Porlock and Countisbury hills. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. EXPERIMENTAL REPORT. Expl. No. REF: HS/Rm/LG5.2.24. BRAKING TESTS - NORTH DEVON. Porlock hill - Length 2½ miles. average grade 1 in 9¾. steepest 1 in 4½.… | ||
| scan0055 | Comparison of chassis specifications and hill climbing performance between a 40/50 HP model and a Hispano Suiza in North Devon. | ||
| View original record | HILL CLIMBING TESTS - NORTH DEVON. 40/50 HP. AND HISPANO SUIZA. Chassis specification. DETAIL. | 40/50 HP. | HISPANO SUIZA. --- | --- | --- Turning circles. | R.H. 58 3/4 ft. L.H. 59 ft. | R.H. 49 ft.… | ||
| scan0056 | Comparison of E.A.C. High Speed Servo and Hispano braking systems during tests in North Devon. | ||
| View original record | BRAKE TESTS - NORTH DEVON+ E.A.C. HIGH SPEED SERVO AND HISPANO SYSTEM COMPARED. Gradients up to 1 in 4 measured with gradieometer. Steeper - local intelligence obtained. OBSERVATION. | EAC. (Cast iron… | ||
| scan0057 | Development and use of a 'home-made' recording accelerometer to measure car performance. | ||
| View original record | [illegible stamped text] X1709 EP11/HSO.4.24. re. Recording Accelerometer. We attach hereto photostats of two charts obtained on a 'home-made' Recording Accelerometer which we thought would interest… | ||
| scan0058 | Proposed modifications to the Goshawk engine for increased efficiency and power. | ||
| View original record | To HS. from R. c. to CJ. BJ. RG. E. DA. BY. PN. H. X1725 R1/M27.6.24. RE. GOSHAWK ENGINE. INCREASE IN EFFICIENCY ETC. X.1725 X.4573 X.4134. We are desirous of getting greater acceleration and power,… | ||
| scan0059 | 20 HP exhaust tests, comparing horsepower results between a standard and modified system. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. X488 EXPERIMENTAL REPORT. Expl. No. 4238 REF: Hs2/LG1.7.24. X488 To R. from Hs. c. to CJ. RG. c. to E. DA. c. to BY. WOR. 20 HP. EXHAUST TESTS. We have… | ||
| scan0060 | Horsepower data for a 20 HP engine with standard and experimental exhaust systems. | ||
| View original record | 20 HP. EXHAUST. HORSE POWER. | R.P.M. | Free exhaust. | Exhaust manifold including hot-spot. | Exhaust pipe from manifold to silencer added. | Silencer added. | Swan neck exhaust pipe added. |… | ||
| scan0061 | Road test results comparing 'A' Standard and 'B' 40/50 Type systems during high-speed and hill climb tests. | ||
| View original record | -3- ROAD TESTS ON 4-G-11. High speed tests on Shardlow straight. 'A' STANDARD Start M.P.H. Finish M.P.H. Time secs. Out 40 58 30 4/5 In 40 58.5 30 3/5 Mean 40 58.25 30.35 'B' 40/50 TYPE. Start M.P.H.… | ||
| scan0062 | Alleviating boiling issues on the 40/50 HP model. | ||
| View original record | R.R. 403 (40 H) (SL 42 12-7-23). J.H., D. X488 EXPERIMENTAL REPORT. COPIES TO R.C.J. B.J. WOR. By E. Da. EP. PN. OY. KG Expl. No. x2631 x3416 766 488 REF. Hs10/LC18.9.24. OBJECT OF TEST. To alleviate… | ||
| scan0063 | Alleviating boiling troubles by hill climbing on indirect gears. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rn/LG18.9.24. ALLEVIATING BOILING TROUBLES BY HILL CLIMBING ON INDIRECT GEARS. These tests were under-taken to confirm… | ||
| scan0064 | Engine cooling performance during hill climbs in different gears. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. -2- EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm/LG18.9.24. Second gear creates an apparent paradox, however, for the finishing temperature in this case rises… | ||
| scan0065 | Vehicle performance concerning gearing, engine speed, and radiator cooling. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. -3- EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm/LG18.9.24. To counteract this we have the fact that the same amount of work (approx.) is done in a very much… | ||
| scan0066 | Series of graphs from radiator tests on Cat and Fiddle Hill, showing how overheating is reduced by climbing on indirect gears. | ||
| View original record | RADIATOR TESTS. CAT AND FIDDLE HILL. OVER-HEATING REDUCED BY CLIMBING ON INDIRECT GEARS. Y-AXIS: TEMPERATURE RADIATOR C° X-AXIS: DISTANCE CLIMBED MILES. CHART A: CONSTANT ROAD SPEED FAN SPEED VARIED.… | ||
| scan0067 | Exceptional qualities of a specific car chassis and a request to retain it for testing and demonstration. | ||
| View original record | To Hs. from BJ. Copy to PN. 4488 2 BJ5/H18.9.24. X488 Re 98-NK. X9770 X9680 PN. has shown me Hs2/LG3.9.24, as our suggestion that this car should be reserved for demonstration purposes was originally… | ||
| scan0068 | Acceleration figures for the 40/50 HP Open Touring Car with both 2-wheel and 4-wheel brakes. | ||
| View original record | X/725 PN10/DN17.3.25. TO Hs FROM PN An important necessity has arisen for obtaining as quickly as possible, some figure showing the rate of acceleration of our 40/50 HP Open Touring Car, both with… | ||
| scan0069 | The reliability of acceleration and four-wheel brake tests published in 'The Motor' magazine. | ||
| View original record | X1725 To PN. from Hs. Hs6/LG19.3.25. ACCELERATION - FOUR WHEEL BRAKES. 4940 X1725 We hope the attached notes will be useful. We intend to let you have our reasons why we consider the tests published… | ||
| scan0070 | Calculation of acceleration and braking curves for a 40/50 car with four-wheel brakes. | ||
| View original record | To PN. from Hs/Rm. Hs/Rm1/LG19.3.25. ACCELERATION - FOUR WHEEL BRAKES. In reply to PN10/DN17.3.25. We are sending you some curves shewing the acceleration and braking which may be expected from an… | ||
| scan0071 | The variables affecting braking performance and the reluctance to provide definitive braking figures. | ||
| View original record | contd :- -2- It is most difficult to accurately estimate the co-efficient of friction between the tyre and the road surface, the more so as the surface of the road varies even from yard to yard. This… | ||
| scan0072 | Continued analysis of vehicle braking performance curves and a critique of other published test data. | ||
| View original record | contd :- -3- For the braking curves below 50 m.p.h., the time to pull up from any given speed is directly proportional to the speed. The distance to pull up however, is proportional to the square of… | ||
| scan0073 | Figures for four-wheel brakes. | ||
| View original record | To FN. from Hs. X1725 Hs2/LG24.3.25. FOUR WHEEL BRAKES. X994D Referring to PN2/DN23.3.25. We trust the figures given on the attached sheet are what you require. Hs. DICKINSON BOND | ||
| scan0074 | Braking performance data table for a four-wheel brake system on an open touring car. | ||
| View original record | FOUR WHEEL BRAKES. OPEN TOURING CAR. 24.3.25. Wt. ratio Front .95 Rear 1.025 TABLE DATA: Column Headers: M.P.H., ALL WHEELS LOCK (Distance., Time.), 40% BRAKING ON THE FRONT (Distance., Time.), REAR… | ||
| scan0075 | Criticising press reports on acceleration and braking performance from motoring journals. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. X1725 EXPERIMENTAL REPORT. Expl. No. REF: Hs3/LG24.3.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to PN. Wor. c. to EP. CWB. PRESS REPORTS… | ||
| scan0076 | The inaccuracy of road tests from motoring papers ('The Motor' and 'The Autocar') due to speedometer errors. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Bml/LG21. 3. 25. ROAD TESTS REPORTED IN - 'THE MOTOR' AND 'THE AUTOCAR'. Recently the motor papers have taken it upon… | ||
| scan0077 | Analysing and questioning the claimed performance figures of a 45 HP Renault. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF Hs/Rm1/LG21.3.25. where they could ensure they were not being misled by the speedometer, and Brooklands has been closed… | ||
| scan0078 | Page 3 of an experimental report discussing performance test inaccuracies and suggesting the use of a Wimperis Accelerometer. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF:Hs/Rml/LG21.3.25. (from the illustrations and Reg.No., is the same car as was used for 'The Motor' tests), is stated to… | ||
| scan0079 | The methodology for calculating Renault acceleration curves. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/Rn2/LG21.3.25. RENAULT ACCELERATION CURVES. When any car is being driven along the road on full throttle at anything… | ||
| scan0080 | Page discussing engine horsepower curves and performance characteristics. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Bn2/LG21.3.25. of 'B' being inevitably concave. As concave H.P. curves usually exist for, at the most, a few… | ||
| scan0081 | The analysis of braking curves, highlighting flaws in contemporary testing methods. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Bml/LG23.3.25. ANALYSIS OF BRAKING CURVES. As we have previously pointed out, the results of braking tests are of… | ||
| scan0082 | The braking deceleration performance of the 'Vermorel' car. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm1/LG23.3.25. On the 'Vermorel' on the other hand, the distances to rest give the following decelerations :- 10 m.p.h.… | ||
| scan0083 | Page discussing and critiquing brake efficiency curves from a motoring journal. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/Bal/LG23. 3.25. Graph: Y-axis: BRAKE EFFICIENCY DECN. FT/SEC2 X-axis: ROAD SPEED M.P.H. Underneath the curve in… | ||
| scan0084 | Mathematical calculations and test results for vehicle braking capabilities. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF:Hs/Rm1/LG23.3.25. on dry concrete, we may take it that for pull ups from 40 m.p.h. and below the retardation should be… | ||
| scan0085 | Time-velocity curve graph for a 40/50 HP open touring car, comparing it with a 45 Renault. | ||
| View original record | TIME VELOCITY CURVE 40/50 R.R OPEN TOURING WT 2.15 TONS. ROAD SPEED. M.P.H. TIME SECONDS. 45 RENAULT THIS CURVE IS EVOLVED DIRECTLY FROM ACCELERATION FIGURES, COMPARING 20 H.P. & 40/50. DATED 26/2/23.… | ||
| scan0086 | Three graphs comparing the braking curves and distances for Delage, Vermorel, and Lagonda cars. | ||
| View original record | A. THE MOTOR 3/3/25. ROAD SPEED. M.P.H. TIME TO REST. SECS. TIMES WHICH WOULD CORRESPOND WITH DISTANCES GIVEN. 26 FT 42 FT 73 FT 130 FT 164 FT 14 H.P. SPORTS DELAGE. BRAKING CURVE. ROAD - TARRED… | ||
| scan0087 | Graph of braking curves for a 40/50 R.R. model, plotting road speed against time to rest. | ||
| View original record | BRAKING CURVES. 40/50 R.R. ROAD SPEED M.P.H. TIME TO REST. SECONDS. A. B. REAR BRAKES ONLY VERMOREL ALL FIGURES FOR OPEN TOURING CAR. WEIGHT FRONT 1.05 TONS. REAR 1.10 COEFFICIENT OF FRICTION BETWEEN… | ||
| scan0088 | Comparison of time-velocity performance curves for a Bentley Speed Model and a Vermorel 12-25. | ||
| View original record | Left Graph: THE MOTOR. 3/3/25. ROAD SPEED M.P.H. TIME SECS. BENTLEY SPEED MODEL. THIS TIME VELOCITY CURVE CONSISTS OF TWO STRAIGHT LINES JOINED TOGETHER BY A CURVE. THIS IS MOST IMPROBABLE. Right… | ||
| scan0089 | Request for performance figures on 4-wheel brakes and deceleration weights for a 40/50 HP, intended for a Member of Parliament. | ||
| View original record | X1725 PN2/DN23.3.25. TO Hs FROM PN Acceleration - 4-wheel brakes. I am obliged for your Hs6/LG19.3.25. The particulars given are very interesting, but they are not in quite the form which enables me… | ||
| scan0090 | Analysis of acceleration curves for a 45 HP Renault vehicle. | ||
| View original record | ANALYSIS OF CURVES OF ACCELERATION OF 45 H.P. RENAULT GIVEN IN 'THE MOTOR' 3/2/25 Brake Horse Power 10 M.P.H 20 M.P.H 30 M.P.H 40 M.P.H 50 M.P.H 60 M.P.H 70 M.P.H 80 M.P.H MAKERS CLAIMED MAXIMUM H.P… | ||
| scan0091 | Theoretical shape of acceleration and deceleration curves, critiquing those published in motor journals. | ||
| View original record | Hs. ENGINE HP. & CAR VELOCITIES. I am quite in agreement with the criticisms put forward by Rm. in connection with the supposed acceleration and deceleration curves published by the Motor Journals… | ||
| scan0092 | Typed note with a handwritten correction discussing the effect of wind pressure on performance curves. | ||
| View original record | - 2 - BY4/H. 6.4.25. [Handwritten annotation] straighten If we now consider wind pressure, the effect would be to [strikethrough]invert[/strikethrough] the curve at high speed but leave it exactly the… | ||
| scan0093 | Car overheating complaint and related historical test data. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. Y488 REF H.1/CJ2/H.2.5.25. To CH: from Hs. OVERHEATING. X76G (blue print) X4214 With reference to CJ2/H.2.5.25. We attach… | ||
| scan0094 | New cooling test methods, results showing cars will boil, and a discussion on louvred versus shuttered bonnets. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. o20 Expl. No. REF: Hs1/L814.5.25. The methods we have now adopted for testing the cooling will show us differences of 2 or 3% and we can… | ||
| scan0095 | Engine overheating in relation to fan belt tension and gear selection. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. Expl. No. REF: HsHml/LG14.5.25; EXPERIMENTAL REPORT. RE: OVERHEATING. With reference to H1/TB/11.5.25. We should like to point out that we do not consider,… | ||
| scan0096 | Page from a memo discussing how driving style can affect a car's tendency to overheat. | ||
| View original record | contd;- -2- Hs/Rm/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… | ||
| scan0097 | Chart comparing overheating test results for a Silver Ghost and a Hispano Suiza under various ventilation conditions. | ||
| 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… | ||
| scan0098 | The method for conducting car performance tests using a three-pen chronograph. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. X1725 Expl. No. REF: Hs2/LG25.8.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. METHOD OF CONDUCTING CAR… | ||
| scan0099 | Instrumentation for performance testing, including braking, high-speed tractive resistance, and velocity/acceleration measurement. | ||
| View original record | R.R. 493A (50M) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF:Hs2/L.325. 8.25. have been taken to prevent the effective tyre diameter altering with speed. The main objection to this… | ||
| scan0100 | From CJ to R arguing against promoting the Phantom as a speed model in favour of the company's established reputation for smoothness and silence. | ||
| View original record | COPY OF MEMORANDUM CJ6/E3.12.25. To R. from CJ. My dear R., Many thanks for your interesting confidential memorandum, R1/M2.12.25, which I received at Adelphi Terrace this morning. We had yesterday… | ||
| scan0101 | Confidential memorandum regarding efforts to increase the acceleration and speed of the New Phantom. | ||
| View original record | To Wor from BJ. Copies to Hs. BP. By. X1725 NEW PHANTOM. BJ4/H9.12.25. PRIVATE. In reply to a confidential memorandum from R. in regard to his endeavours to increase the acceleration and speed of the… | ||
| scan0102 | The acceleration performance of Mr. Geoffrey Summers' car (117-MC), compared with a standard Phantom. | ||
| View original record | R.R. 498A (50 H) (D.D. 31. 12-6-25) J.A.D. Bt. X1725 EXPERIMENTAL REPORT. Expl. No. REF: Hs/Ru/LG1412125 +4118 MR. GEOFFREY SUMMERS CAR - 117-MC. +8771 +4528 With reference to the report on the… | ||
| scan0103 | The braking performance and gear acceleration of the Phantom. | ||
| View original record | R.R. 498a (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REE/Rn/7.L41.21.25 The braking figures are very interesting. The results for the Phantom seem remarkably consistent, but… | ||
| scan0104 | Comparing the acceleration and maximum speed performance of Sunbeam and Vauxhall cars. | ||
| View original record | R.R. 493A (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF:Hs/Ru/LG14.12.25 The Sunbeam acceleration figures are interesting because they shew that though stress-lining can give… | ||
| scan0105 | With graphs comparing the acceleration of Phantom and Vauxhall vehicles. | ||
| View original record | R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF: Hs/An/1.014.12.25 GRAPH 1. Individual readings only given for 117-MC. thus x these shew the rather erratic nature of… | ||
| scan0106 | Comparing acceleration times and braking distances of model 117-MC against a standard model. | ||
| View original record | R.R. 498A (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF Hs/Rn/LGT4.12.25 Expressing the time to accelerate in m.p.h. and seconds, instead of as in Graph 1. - we have :-… | ||
| scan0107 | Hill climb test procedures and results for the 20-HP and 'New Phantom' chassis on Brockley Hill. | ||
| View original record | Please file under. X725 ACCN 9.T.R. TESTS ON BROCKLEY HILL. 20-HP. Chassis. Start. Pass A.A. man at 20-m.p.h. to finish last telegraph post about 20 yards from top of hill, 80 seconds. (Good road… | ||
| scan0108 | Road performance test procedures for the New Phantom chassis on various specified hills. | ||
| View original record | +488 +488 +4578 NEW PHANTOM. Road performance tests as carried out by the Production Test Dept. (Chassis weight 47 cwts.) (1) STANTON HILL. (Far end of Swarkestone Bridge). Start at 10 m.p.h. full… | ||
| scan0109 | The average speeds and times for a 20 HP chassis over several test hills. | ||
| View original record | f488 X488 f457K 7.1.26. AVERAGE SPEEDS & TIMES OF 20 HP. CHASSIS. WEIGHT 31 CWTS. STANTON HILL. (Short hill over Swarkstone Bridge). Start - first telegraph post on left 10 m.p.h. Finish- last " " "… | ||
| scan0110 | Performance test data for a 20 HP car on Ticknall Hill, recording times against varying ballast weights. | ||
| View original record | K688 20 HP PERFORMANCE ON TICKNALL HILL TIME TAKEN FROM RAILINGS TO FIRST TREE AFTER GATE 20 HP. PERFORMANCE ON TICKNALL HILL. TIME TAKEN FROM RAILINGS TO FIRST TREE AFTER GATE TEST BODY 6 3/4 cwt.… | ||
| scan0111 | On car performance and acceleration, with a caution about the accuracy of attached comparative performance curves. | ||
| View original record | X1725 19.11.26. FUNDAMENTALS OF CAR PERFORMANCE. X4572 / X790 ACCELERATION. The question sometimes arises as to the relative performance of various R-R models - also the effect of axle ratio and… | ||
| scan0112 | Two acceleration comparison charts for Open Touring Cars, one comparing high vs low compression ratios and the other comparing 20 HP vs 40/50 models. | ||
| View original record | ACCELERATION KIT. 25 HIGH V LOW COMPRESSION RATIO 40/50 VELOCITY M.P.H. ALL FIGURES DIRECT DRIVE C.O. CLOSED OPEN TOURING CARS - 10 E.X. WT EMPTY 2.27 TONS COMP. RATIO 5.2/1 ------ 98 N.K. WT EMPTY… | ||
| scan0113 | Two acceleration graphs, one comparing a Rolls Royce vs a Bentley and the other comparing high vs low axle ratios. | ||
| View original record | ACCELERATION ROLLS ROYCE V BENTLEY VELOCITY M.P.H. TIME SECONDS. 6 1/2 LITRE BENTLEY 10 E.X. 15 TOOTH AXLE STANDARD PHANTOM. ALL FIGURES DIRECT DRIVE (CLOSED) ACCELERATION HIGH V LOW AXLE RATIO… | ||
| scan0114 | Two graphs comparing acceleration performance of standard vs high compression 20 HP models. | ||
| View original record | TOP GRAPH: ACCELERATION ACCELERATION FT./SEC./SEC. ROAD SPEED M.P.H. Legend: HIGH COMP. 20 H.P. HIGH COMP. 20 H.P. CUT OUT OPEN STANDARD 20 H.P. BOTTOM GRAPH: ACCELERATION HIGH V LOW COMPRESSION RATIO… | ||
| scan0115 | Performance tests and modifications on the 20 HP engine, comparing it to the standard Phantom. | ||
| View original record | X1725 To R. from Hs/Rn. c. to BJ. Wor. c. to RG. E. c. to DA. BY. Hs/Rn2/LG3.12.26. 20 HP. PERFORMANCE. X5771 / X5605 We have been conducting a number of tests on the 20 HP. to ascertain what… | ||
| scan0116 | Two graphs comparing vehicle acceleration performance between a Rolls Royce Phantom and a Bentley, and between two different axle ratios on a Phantom. | ||
| View original record | ACCELERATION ROLLS ROYCE V BENTLEY VELOCITY M.P.H. TIME SECONDS. 6 1/2 LITRE BENTLEY 10 E.X. 15 TOOTH AXLE STANDARD PHANTOM. ALL FIGURES DIRECT DRIVE C.O. CLOSED ACCELERATION HIGH V LOW AXLE RATIO… | ||
| scan0117 | Two blueprint graphs comparing acceleration performance of various car models and configurations. | ||
| View original record | ACCELERATION HIGH V LOW COMPRESSION RATIO 40/50 VELOCITY M.P.H. OPEN TOURING CARS. 10 E.X. Wt EMPTY 2.27 TONS COMP RATIO 5.2/1 98 N.K. Wt. EMPTY 2.34 TONS COMP RATIO 4/1 10 E.X. 1.5 CWT LIGHTER THAN… | ||
| scan0118 | Performance charts for a 20 HP model, showing acceleration and velocity under various configurations. | ||
| View original record | 32 20 H.P. PERFORMANCE ACCELERATION ACCELERATION FT/SEC/SEC ROAD SPEED M.P.H. LEGEND (TOP GRAPH): 1 HIGH COMP 20 H.P. 2 HIGH COMP 20H.P. CUT OUT OPEN 3 STANDARD 20H.P. 4 20 H.P. SINGLE LORRAINE… | ||
| scan0119 | Fundamentals of car performance, focusing on acceleration and the factors affecting it. | ||
| View original record | X1725 FUNDAMENTALS OF CAR PERFORMANCE. ACCELERATION The question sometimes arises as to the relative performance of various R-R models - also the affect of axle ratio and compression ratio on… | ||
| scan0120 | Two graphs comparing the acceleration performance of a 20 HP engine with different compression ratios and exhaust configurations. | ||
| View original record | ACCELERATION ACCELERATION FT/SEC/SEC. ROAD SPEED M.P.H. HIGH COMP. 20 H.P HIGH COMP. 20 H.P. CUT OUT OPEN STANDARD 20 H.P. ACCELERATION HIGH V LOW COMPRESSION RATIO 20 H.P. VELOCITY M.P.H. TIME… | ||
| scan0121 | Two acceleration graphs, one comparing a Rolls Royce vs a Bentley and the other comparing high vs low axle ratios. | ||
| View original record | ACCELERATION ROLLS ROYCE V BENTLEY VELOCITY M.P.H. TIME SECONDS. 6 1/2 LITRE BENTLEY 10 E.X. 15 TOOTH AXLE STANDARD PHANTOM. ALL FIGURES DIRECT DRIVE C.O. CLOSED. ACCELERATION HIGH V LOW AXLE RATIO… | ||
| scan0122 | Two graphs comparing acceleration performance for different engine compression ratios and car models. | ||
| View original record | ACCELERATION HIGH V LOW COMPRESSION RATIO 40/50 VELOCITY M.P.H. TIME SECONDS OPEN TOURING CARS 10 E.X. WT EMPTY 2.27 TONS COMP RATIO 5.2/1 98 N.K. WT EMPTY 2.34 TONS COMP RATIO 4 1/4 10 E.X. 1.5 CWT… | ||
| scan0123 | Comparative table of engine specifications (cylinder capacity, bore, and stroke) for various car makes. | ||
| View original record | MAKE OF CAR TOTAL CYLINDER CAPACITY cc's BORE & STROKE INS. RENAULT 45 9066 4.33 x 6.29 DAIMLER 45 8350 4.6 x 5.1 HISPANO 45 7980 4.33 x 5.51 R.R. E.A.C. 7660 4.25 x 5.5 R.R. 40/50 7440 4.5 x 4.75… | ||
| scan0124 | The acceleration figures for the 20 HP car. | ||
| View original record | To D/L. from Hs/Rm. [Handwritten]: X1725 Hs/Rm4/LG13.5.27. 20 HP. ACCELERATION. [Handwritten]: X1728 [Handwritten and crossed out]: X5770 With reference to the attached. Herewith the acceleration… | ||
| scan0125 | Hand-drawn graph showing the top gear acceleration curve for a 1924 20 HP Touring Car. | ||
| View original record | VELOCITY M.P.H. 10 20 30 40 50 60 TIME SECS 10 20 30 40 50 60 70 TOP GEAR ACCELERATION CURVE STANDARD 1924 20 H.P. TOURING CAR | ||
| scan0126 | Responding to a complaint about a 'want of acceleration', defending the carburettor's low-speed performance over high-speed power. | ||
| View original record | Hs. from R. c. to BJ. Mr. Fuller. Mr. Olley. Mr. Nadin. X/1725 R1/M16.9.27. SPRINGFIELD COMPLAINT X.1725 OF WANT OF ACCELERATION. X.3614 X.8080 I disagree with this, but we know that our carb. is… | ||
| scan0127 | Performance comparison report between standard and long duration camshafts, including hill climb and acceleration test results. | ||
| View original record | To Hs. from GWH. 4725 20.10.27. RE. PERFORMANCE BETWEEN STANDARD AND X8090 LONG DURATION CAMSHAFTS. Tests with the two camshafts for acceleration shews a better performance with the present standard… | ||
| scan0128 | Chassis and engine improvements, evaluating options for acceleration and the number of engine cylinders. | ||
| View original record | To BJ. from R. c. to BY. Hs. V1725 R3/M31.10.27. CHASSIS PROBLEMS. X.523 X.8420 ACCELERATION FOR PASSING. X.1725 X.8050 There is an increasing demand for more rapid acceleration, but which cannot be… | ||
| scan0129 | Outlining proposed modifications for Phantom power development to increase performance. | ||
| View original record | Hs. from R. c. to BJ. Wor. C. c. to PN. CWB. SG. 41725 R2/M28.11.27. X.8830 X.172 X.8060 X.877 X.8771 PHANTOM - POWER DEVELOPMENT. For increased performance of acceleration, hills, and speed we are… | ||
| scan0130 | Standardisation of the 14/52 axle ratio to increase performance. | ||
| View original record | RR 755 REVISED (10H) (DE 649 9-12-26) BM. 2/1187. C. to C. 21 COMPLETED 23.12.27 Y/1725 STANDARDISATION of CHASSIS PARTS. Description of Parts. 14/52 AXLE RATIO. Origin. To increase performance. Date… | ||
| scan0131 | Form with a list of questions regarding the fitting of a new standardised chassis part. | ||
| View original record | STANDARDISATION of CHASSIS PARTS (Reversed text at the top) (1) The number of the first chassis on which the new part will be fitted. When required. (2) Date when the chassis will be handed to test,… | ||
| scan0132 | Acceleration curve, a 14-tooth axle, and the return of related blueprints. | ||
| View original record | X1725 X8350 To BY. from Hs/Rm. Hs/Rm5/LG19.3.23. Herewith acceleration curve as requested per attached note. Really far the best thing to do is to take the customer out in the car fitted with the… | ||
| scan0133 | Comparison tests of a 40/50 Chassis - Series F with 15/52 and 14/52 ratio axles. | ||
| View original record | Hs. X1725 Mx/MdM6/T9.5.28. We give below comparison tests of Standard 40/50 Chassis - Series F. Chassis No. 35-AL - weight with passengers 53 cwts, open test kit, roads dry, 10 miles per hour cross… | ||
| scan0134 | Accelerometer test record graph showing performance on a chassis test rig. | ||
| View original record | 81 - F.H. Inside No. 40/50 Passengers... M. Maddocks, M. Wyer ACCELEROMETER RECORD Date 24-4-28 Axle ratio 15/52 Type of body Chassis. Test rig. Weight unladen Total 47 cwts Road conditions Dry,… | ||
| scan0135 | Performance test record of a chassis, showing instrument readings from road tests. | ||
| View original record | Chassis No. 11AL 40/50 Passenger: Mr Maddocks, M Wyer Axle ratio 15/52 RETD. Date 25-4-28 Chassis Weight unladen with Total 47 cwt. Conditions Dry, smooth, London Road. 5.0 3rd 6.0 2nd 6.6 1st gear… | ||
| scan0136 | Performance test accelerometer record for a 40/50 chassis on a dry, smooth London Road. | ||
| View original record | ACCELEROMETER RECORD Chassis No. 11AL 40/50 Type of Body. Chassis Date 26-4-28 Total 47 cwt Passengers... M. Maddocks. M. Wyer. Rear Axle ratio 14/52 Road conditions. Dry, smooth, London Road.… | ||
| scan0137 | Accelerometer record showing performance test results for a Chrysler 75 vehicle. | ||
| View original record | "Chrysler 75" Chassis No. Passengers: 2 Axle ratio ACCELEROMETER RECORD. Date. 23-1-29 Type of body: Allweather Weight unladen Front total. Rear: 32 1/2 cwt. Road conditions: fair. wet. greasy Run on… | ||
| scan0138 | Accelerometer record for a Chrysler 75' vehicle test. | ||
| View original record | Chrysler 75" ACCELEROMETER RECORD. Date 23-1-29 Chassis No.........HP......... Axle ratio... Type of body. Allweather... Weight unladen ... total ... Rear. 32 1/2 cwts. Passengers...2... Road… | ||
| scan0139 | Letter from Rolls-Royce of America to E.W. Hives in Derby, following up on queries about the 20HP car's performance and handling. | ||
| View original record | ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. X1725 Na5B83128 August 31st, 1928. Mr. E. W. Hives, ROLLS-ROYCE LTD. Derby, England. Dear Hives, Many thanks for yours, Hs/Rml/LG18.8.28 referring to… | ||
| scan0140 | List of topics covering engine mounts, gauges, fabrics, and tests for various car models. | ||
| View original record | Rubber engine mounting. 10 & iii K.S. Petrol Gauges. Rubber fabric for 10.E.X. Cotton duck for new type dampers. Bumper test Steering support for 12.E.X. | ||
| scan0141 | Performance comparison of Mr. Royce's 20 HP car against a Buick and various Chrysler models. | ||
| View original record | To NA. from Hs/Rm. X1725 Hs/Rm7/LG20.9.28. X4012 With reference to your NA5/B83128. As Mr. Royce's 20 HP. car is fitted with a standard engine its acceleration is about 7% better than the standard 20… | ||
| scan0142 | From 'R' considering four potential solutions to the problem of increased acceleration in cars. | ||
| View original record | Hs. from R. X1725 R2/M16.10.28. IMPROVED ACCELERATION. X.1725 X.4550 X.4474 X.523 We are considering 4 ways of meeting the increased acceleration problem with cars, such as :- [Note regarding items… | ||
| scan0143 | Power increase for the 'CHINA' 25 HP engine, covering timing, valve sizes, materials and pipe dimensions. | ||
| View original record | COPY. SECRET AND URGENT X1725. HS. FROM R.& E. R.1/M4.11.29. c. to Sg. Wor. By. X.5770 X.5771 X.1725 re. "CHINA" ENGINE 25 HP. POWER INCREASE. Referring to your report Hs/ACLL/AD2.11.29., we do not… | ||
| scan0144 | Typed memorandum detailing proposed modifications to various engine components. | ||
| View original record | R.1/M4.11.29.Contd. head all to be 1.5 but we shall see what is possible with the existing cylinder studs and tappet rods. There will be alterations to the coreboxes for the head, and the pattern will… | ||
| scan0145 | Methods to improve vehicle acceleration through engine power and gearbox modifications. | ||
| View original record | HS. DA. E. BY. from R. c. to BJ. Wor. c. to PN. LHS. c. to SG. CWB. C. c. to Mr. Claremont. X1725 R1/M7.11.28. ACCELERATIONS. X.1725 X.7771 X.7310 X.8310 X.4550 We think for traffic work a… | ||
| scan0146 | Technical discussion on an advanced epicyclic gearbox unit compared to existing systems. | ||
| View original record | contd :- -2- sliding these, or continual mesh, with jaw clutch and freewheel side shaft, and also of a still higher 3rd. ratio to be more useful and easier to get into. (There are no double top speeds… | ||
| scan0147 | Secret internal memo concerning experimentation on accelerations. | ||
| View original record | To R. from BJ. Copyto Hs. Da. E. BY. Wor. PM. LHS Sg. CWB. C. Mr.Claremont. X1725 SECRET. ACCELERATIONS. BJ1/29.11.28 Thank you for R1/M7.11.28 concerning the above which you were good enough to… | ||
| scan0148 | Performance comparison memo for the 20 HP engine, detailing the power increase from a turbulent head versus the standard compression. | ||
| View original record | X1725 R. from E. El/M26. 4. 29. c. to SG. Wor. PN. c. to Hs. BY. "20 HP" PERFORMANCE. X.5770 X.5050 X.790 X.1725 The present standard compression ratio is 4.8 to 1. The turbulent head as tested for… | ||
| scan0149 | Comparative analysis of power and road performance for a modified 20 HP engine with an increased bore. | ||
| View original record | To R. from Hs/AJL. c. to Sg. Wor. c. to E. DA. c. to BY. PN. X1725 Hs/AJL1/LG27.4.29. X.4012 X.5771 X.1725 X.488 20 HP. COMPARATIVE POWER AND ROAD PERFORMANCE. First tests on 20 HP. engine with… | ||
| scan0150 | Performance comparison report on road tests and acceleration for various car models, including a Stanton Hill test analysis. | ||
| View original record | contd :- -2- pronounced, in spite of the fact that the Chrysler engine is larger. Road tests - acceleration. The acceleration figures obtained are what one expects after studying the road wheel power… | ||
| scan0151 | Performance tests, comparing speedometer readings and power curves for different car models. | ||
| View original record | contd :- -3- attained being the speed given as finishing speed - it is therefore a,low speed full throttle test. The Chrysler speedometer readings given are apt to be misleading - the times only… | ||
| scan0152 | Comparison table of specifications and performance data for various car models. | ||
| View original record | CAR. | 12-G4. | 12-G4. | 14-G4. | 17-G4. | Chrysler. | 21-EX. Engine. | Std. 20 HP. | .2" on bore. R= 5.25/1 14% larger car. | R= 5/1 Turbulent head. | Std. 20 HP. | '75' | S.S. Capacity C.C. | 3127 |… | ||
| scan0153 | Graph comparing the top gear acceleration performance of various car models. | ||
| View original record | TOP GEAR ACCELERATION S.S (20 Ex): --- 12G IV (20' ON BORE) TURB. HEAD CHRYSLER .- R = 5.25:1 LITRES/TON/MILE 12 G IV :- 6826 CHRYSLER:- 6757 20 Ex :- 7341 ROAD SPEED M.P.H. TIME SECS. AV. STANDARD 20… | ||
| scan0154 | Performance graph of B.HP at the road wheels vs. Engine R.P.M. for various 20 HP engine configurations. | ||
| View original record | B.H.P. AT ROAD WHEELS. ENGINE R.P.M. 5.1:1 TURBULENT HEAD 20 H.P. 20 H.P. POWER AT ROAD WHEELS. STANDARD 20 H.P: STANDARD 20 H.P. WITH .20" LARGER BORE AND R=5.25: CHRYSLER 75: AXIS VALUES: 10, 20,… | ||
| scan0155 | Comparative performance test report between the 19-EX and a standard Phantom chassis. | ||
| View original record | Hs. from Mx. X1725 29th May 1929. COMPARATIVE TESTS OF 19-EX and STANDARD PHANTOM CHASSIS We have today compared 19-EX with Phantom Chassis No. 73-OR - incidentally this is the car that Rm. and myself… | ||
| scan0156 | Tests to determine the fastest method for climbing Ticknall Hill in a 10-EX vehicle, with comparisons to other cars. | ||
| View original record | x488 To E. From Hs/AJL. C. to De. Hs/AJL.1/MJ.22.8.29. x488 x8774 x7310 A series of tests were carried out to find out the method of driving to be followed in order to climb Ticknall Hill in the… | ||
| scan0157 | Report from Paris comparing the acceleration of American versus British chassis. | ||
| View original record | DA. From R. HS. Re. REPORT FROM PARIS. ACCELERATION - AMERICAN VERSUS BRITISH CHASSIS. I believe that the American RR. bodies are generally now lighter than most European bodies, but I think the… | ||
| scan0158 | Comparative tests of 11/50 and 12/50 rear axle gear ratios for 25 HP high compression cars. | ||
| View original record | To R. From Hs/AJL. (Held up). c. to Sg. Wor. c. to E. Da. c. to By. PN. X172^5. Hs/AJL.1/WJ.7.2.30. X.5350 X.5771 X.488 X.1725 REAR AXLE GEAR RATIO FOR 25 HP. HIGH COMPRESSION CARS. We have carried… | ||
| scan0159 | Comparison report on 12/50 and 11/50 axle ratios with hill climb test results and recommendations. | ||
| View original record | -2- HS/AJL1/MJ.7.2.30Contd. dry roads and no appreciable wind. The tests were carried out on these hills side by side. TICKNALL HILL. 12/50 axle. Time for hill - 67.5 secs. 11/50 axle. " " " - 65… | ||
| scan0160 | 'TEL' acceleration and deceleration recorder. | ||
| View original record | File under Accelerometer AS/Rm Are you interested B.H/C.F. "TEL" ACCELERATION AND DECELERATION RECORDER HASLER TELEGRAPH WORKS, 26, Victoria Street, LONDON, S.W.1. Telegraphic address "SIVAD, LONDON"… | ||
| scan0161 | Letter from Hasler Telegraph Works regarding their 'TEL' Acceleration & Deceleration Recorder instrument. | ||
| View original record | TELEPHONE Nº 0431 VICTORIA. TELEGRAPH ADDRESS “SIVAD. LONDON”. HASLER TELEGRAPH WORKS ERNEST E. LLOYD. F. MASON. 26, VICTORIA STREET, WESTMINSTER, London, S.W.1. November 11th 1930. Messrs. Rolls… | ||
| scan0162 | Descriptive document for the 'TEL' Acceleration and Braking Recorder, outlining its purpose and mechanical operation. | ||
| View original record | "TEL" Acceleration and Braking Recorder, with diagram roll 65 m/m high. ============== Introduction. The ever-increasing demands on all vehicles, especially motor-cars, tramcars and lifts, as well as… | ||
| scan0163 | Graph illustrating the movement of a pointer and stylus, plotting the graduation of a dial against running time in seconds. | ||
| View original record | Acceleration and Braking Recorder. "J.T." Graduation of dial. Distance travelled per second from zero. Maintained position from last measurement of road travelled. Duration one second Movement of… | ||
| scan0164 | Page describing the function of a recording stylus and diagram roll for a measuring instrument. | ||
| View original record | -3- These functions are repeated second by second, which prevents the pointer from falling back, and sets it every second to the corresponding value. The value indicated by the pointer thus always… | ||
| scan0165 | Photograph and dimensional drawings of a tachograph instrument. | ||
| View original record | Fig. 2 EIN AU Papiervorschub KILOMETRES 10, 20, 30, 40, 50, 60, 70, 80 BREVET S.G.D.G. Fig. 3 1:3 233 170 51 114 20 40 10.2 150 37.5 24.5 6.4° 15.5ø 25.75ø 30/1° 248 R=140 95.5 107.5 50.5 9 18 97 308… | ||
| scan0166 | Page 3 of a document detailing the operation and specifications of a recording instrument and a 'TEL' Accelerometer. | ||
| View original record | -3- The length of a roll of transparent paper is about 30 metres, which, with a forward feed of, for example, 2 m/m per metre, allows of the measurement of a course of 10 km. or with a feed of 1 m/m a… | ||
| scan0167 | Photograph and reversed text describing a 'Tapley' Gradometer test rig attached to a car. | ||
| View original record | Fig. 4 (Reversed text from back of page) ... is very thin, & takes a great amount of beating and abuse. The band is of Ordnance... which, when being checked, absolutely... General Description. The… | ||
| scan0168 | Page explaining the function and data interpretation of a fifth wheel drive and accelerometer for vehicle testing. | ||
| View original record | -4- A fifth wheel drive has been specially designed for the drive of the instrument on automobiles (Fig. 4). This device is composed of a fixing bracket forming a bearing around which pivots a frame… | ||
| scan0169 | Page explaining the methodology for measuring vehicle speed and acceleration over specific time periods. | ||
| View original record | -5- The duration of the 1st M.P. can vary between zero and one second, for it depends on the position of the escapement at the moment when measurement begins. In order to reduce this error to a… | ||
| scan0170 | Analysis of vehicle acceleration and braking performance calculations based on a speed diagram. | ||
| View original record | -6- distance A-G. However, as we are only counting the 17th M.P. as half a second, the halfof the distance traversed by this last M.P. must likewise be deducted from the distance A-G. In order to… | ||
| scan0171 | Explanation of a diagram showing speed and braking measurements over sequential periods. | ||
| View original record | -7- the drop H-J at the end of No. 19 measurement period. The height J-K corresponds to the average speed of the 19th M.P. Again in this case it cannot be determined exactly the actual point at which… | ||
| scan0172 | Analysis of a braking diagram, summarizing speed, distance, time, and deceleration. | ||
| View original record | -8- 9 km. per hour. As the speed at the end of this 24th M.P. is not yet zero, this speed is marked during the duration of the distance travelled in the 25th M.P. by a horizontal N-O. At the point O,… | ||
| scan0173 | Remarks on interpreting diagram data for vehicle speed and acceleration over measurement periods. | ||
| View original record | -9- SOME REMARKS ON THE DIAGRAM The feed of the diagram paper being operated by the driving shaft of the instrument, is always proportional to the instantaneous speed, and takes place without any lag.… | ||
| scan0174 | Conversion table of speed (km/h or mph) to distance travelled per 1/2 second (metres or feet). | ||
| View original record | DISTANCE TRAVERSED IN RELATION TO VARIOUS SPEEDS Speed Distance per 1/2 second Speed Distance per 1/2 second Speed Distance per 1/2 second Speed Distance per 1/2 second kms. or kms. or kms. or kms. or… | ||
| scan0175 | Technical graph, labeled Fig. 5, showing a plotted curve on a grid with various annotations and measurements. | ||
| View original record | Fig. 5, 0, 15, 30, 45, 60, 75, 90, 60 m/m, 30 m/m, 3 m/m, 1 1/2 m/m, 1/2, 1, 1 1/2, 2, 2 1/2, 3, 3 1/2, 4, A, B, C, D, E, F, G, H, J, K, L, M, N, O, P, R, S, 1°, 2 1/2°, 3 1/2°, 17 R.P., 18 R.P., 19… | ||
| scan0176 | Comparison of acceleration performance and weight for car models 18-GIV and 14-GIV. | ||
| View original record | To R. From Hs/Rm. c. Sg. Wor. c. D.B. EV. X 1725. Hs/Rm.S/AD21.11.31. ACCELERATION 10,000 MILES CAR. During the trial of 18-GIV prior to its going to France, there was some criticism that its low… | ||
| scan0177 | Consumption and acceleration tests on a semi-expanding carburetter using different needles. | ||
| View original record | 81725. For Files. 19-EX. 7.11.32. X7080. CONSUMPTION TESTS WITH SEMI-EXPANDING CARBURETTER. We have been carrying out consumption tests along with acceleration tests to obtain the best compromise with… | ||
| scan0178 | Proposal to modify the air valve, needle, and diffuser to improve mixture control and fuel consumption. | ||
| View original record | -2- The air valve and needle having been drawn upwards at these speeds the needle is working on a very slow taper. At low speeds when the air valve is at the bottom the .050" movement of the jet is… | ||
| scan0179 | Acceleration test results for vehicle 27-EX on Shardlow Road. | ||
| View original record | To Rm. from Hs/Wyman. X1725. 29.6.33. ACCELERATION TESTS ON 27-EX. Weight of car, petrol tank full. Tons. Cwts. Qrs. Lbs. Front. 1 1 1 14 Rear 1 7 0 14 Total 2 8 2 0. Rear Axle Ratio 11 x 41. SHARDLOW… | ||
| scan0180 | Comparison of mean way acceleration times for vehicles 25-EX, 19-EX, and 27-EX. | ||
| View original record | X1725 8.8.33 P.II. ACCELERATIONS. 25-EX. 5-1 c/r. old type camshaft, 11x41 axle, old type carburetter. Complete car wt. 48¾ cwt. 19-EX. 5¼-1 c/r. new type 114º camshaft. 12x41 axle. Semi expanding… | ||
| scan0181 | Acceleration performance test data for a Bentley with different axle configurations and settings. | ||
| View original record | X1728. 21.8.33. ORIGINAL BENTLEY IN FRANCE 11/43 AXLE. The acceleration figures of the car are as follows:- M.P.H. SEC. M.P.H. SEC. 10-20 5 10-20 10-30 8 2/5 20-30 4 3/5 10-40 13 30-40 3 1/5 10-50 18… | ||
| scan0182 | Requesting performance figures for a production model, specifically on braking, acceleration with a 10/41 axle ratio, and compression ratio. | ||
| View original record | S/W (Hs/LID). X1725. Bly4/HEM.25.9.33. HS/LID 5/KT.21.9.28 I thank you for your memo. reference The information you send will be very useful. We should very much like to receive your figures in… | ||
| scan0183 | Providing acceleration performance figures for a Bentley 1.B.IV saloon car. | ||
| View original record | W/S. X 1725 To Bly. from Hs/Lid. Hs/Lid.2/KT. 26.9.33. XVSY26 BENTLEY PERFORMANCE. Thank you for your Bly.4/HEM .25.9.33. We are sorry, but we have no braking figures applicable to the production… | ||
| scan0184 | Acknowledging receipt of Bentley performance figures and anticipating further data on braking. | ||
| View original record | S/W (Hs/LID). LID r172S Bly2/HEM.27.9.33. re: Bentley Performance. I thank you for your memo. Hs/Lid.2/KT.26.9.33. The figures you send are very useful and I note that you will be letting us have any… | ||
| scan0185 | Speedometer accuracy and acceleration test results for an Essex Terraplane. | ||
| View original record | X1725. To Hs/Rm. c. Hs/Lid. 30.9.33. 8451 ESSEX TERRAPLANE. The speedometer has been checked over the mile, and the table shows the various speeds. M. P. H. Speedo. Reading. 30. 40. 50. 60. Timed… | ||
| scan0186 | Performance tests on an Essex Terraplane car. | ||
| View original record | To Hs. e. Hs/Lid. X17251 13.10.33. r4217 ESSEX TERRAPLANE. The following is a table of Performance Tests carried out with the above car. Ticknall Hill. Average of 3 runs. Start. 1st Gate. Finish.… | ||
| scan0187 | Comparison of acceleration figures for a 3 1/2 litre Bentley against an Alvis 20, Talbot 105, and Essex Terraplane. | ||
| View original record | S/W. Hs...from Bn. Copy to Wor. x1725. Bn.1/WT13.10.33. Below are some comparative acceleration figures taken and given to me by "Motor Sport" :- 3 1/2 litre Bentley. Alvis 20. Talbot 105. Essex… | ||
| scan0188 | Urgent request for a comparison of acceleration speeds between the 20 HP, early 20/25 HP, and present 20/25 HP models. | ||
| View original record | X1725 U R G E N T. By S/W. Cx/Esd5/CP27.10.33. Will you please be good enough to let us know the comparison in the speed of acceleration from 0 to 50 m.p.h. of the 20 H.P., the early 20/25 H.P. and… | ||
| scan0189 | Attaching acceleration curves for the original 20 HP, early 20/25 HP, and present standard 20/25 HP car models. | ||
| View original record | X172/5. W/S. To Cx/Esd. from Hs/Lid. Hs/Lid.3/KT.30.10.33. Cx/Esd5/CP27.10.33. Attached are acceleration curves for the original 20 HP. car, early 20/25 HP., and present standard 20/25 HP. car, as… | ||
| scan0190 | Comparative acceleration graph plotting car speed against time for three vehicle models. | ||
| View original record | COMPARATIVE ACCELERATION ORIGINAL 20 H.P. CAR 20/25 H.P. CAR PRESENT 20/25 H.P. CAR PRESENT 20/25 H.P. 37CWT. ORIGINAL 20/25 H.P. 37CWT. 1924 20 H.P. CAR (OPEN) (31CWT.) CAR SPEED (M.P.H.) TIME… | ||
| scan0191 | Performance and acceleration figures comparing a Standard Carburettor with a New Type Carburettor. | ||
| View original record | To Hs/Gry. C. to HB/CTS. 1725 13.2.34. 19-G-IV - PERFORMANCE & ACCELERATION FIGURES. Axle 11 x 50 Tyres 6" x 19" Total Weight Tons cwt. qr. lb. 1 17 1 7 Standard Carburettor New Type Carburettor.… | ||
| scan0192 | Issues with an inadequate throttle spring on the Phantom III and introducing a stronger replacement. | ||
| View original record | SAE - 26. 1000 E/PSN.1/MN.19.10.36. To BY. Copy to Hs/Rm. [Handwritten] F.Dodd Dx. Ex. RHO. [Handwritten] What throttle spring have we on 32E.X. Stronger Throttle Spring - Phantom III. We send you… | ||
| scan0193 | Showing acceleration figures for a 3 1/2 Litre Bentley. | ||
| View original record | 1000 To Hd. from Rm/FD. Rm/FD.15/AP.15.3.37. 3 1/2 LITRE BENTLEY ACCELERATION FIGURES. Car weight complete 31 cwts. 2 qrs. 0 lbs. 10.-30 - 8.85 secs. 10 -40 -13.5 " 10 -50 -18.3 " 10 -60 -24.25 "… | ||
| scan0194 | Acceleration tests conducted on a vehicle before and after altering the axle ratio. | ||
| View original record | Rm. 25-G-VI. ---------- 1000 28/3/38 Acceleration Tests before and after altering axle ratio taken on Shardlow Road. Weight of car 1 ton 19 cwts, 0 qrs. 7 lbs. M.P.H. Axle ratio Axle ratio 4.55 to 1.… | ||