Rolls-Royce Archives
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
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Breakdown of the weight of a standard Dunlop wheel and tyre assembly.21th Aug 1923Box 45 \ 1  Scan307
Letter from Dunlop regarding re-treaded tyre covers for testing purposes.31th Oct 1923Box 45 \ 1  Scan308
Requesting tyres from Messrs. Dunlop to be sent to the Experimental Department.11th Nov 1923Box 45 \ 1  Scan309
Letter from Dunlop Rubber Co. Ltd. regarding the re-treading of tyre covers for testing purposes.31th Oct 1923Box 45 \ 1  Scan310
Letter to Dunlop Rubber Co. returning a chafed inner tube and providing feedback on low-pressure tyre performance and wear.10th Dec 1923Box 45 \ 1  Scan311
Continuation page of a letter regarding the return of borrowed 40/50 wheels and tyres.24th Mar 1924Box 45 \ 1  Scan312
Stocking of straight-sided tyres and tubes by agents following supply issues.24th Mar 1924Box 45 \ 1  Scan313
Weekly report detailing the performance, mileage, and issues for 'Dunlop' S.S. Cord tyres on vehicle 35 PK.13th Jun 1924Box 45 \ 1  Scan314
The positions and performance of Dunlop tyres on vehicle 35 PK.18th Jun 1924Box 45 \ 1  Scan315
Letter to Messrs. Rapson requesting more tyres for comparative testing against Dunlop tyres on 40/50 HP cars.18th Jun 1924Box 45 \ 1  Scan316
Weekly report detailing the mileage and performance of Dunlop S.S. Cord Tyres on a 35 PK vehicle.30th Jun 1924Box 45 \ 1  Scan317
Weekly report on Dunlop S.S. Cord tyre testing, detailing daily and total mileage, and wear issues.21th Jun 1924Box 45 \ 1  Scan318
The position and particulars of Dunlop tyres on chassis 98 NK.21th Jun 1924Box 45 \ 1  Scan319
The positions, numbers, and performance of 'Dunlop' tyres on vehicle 35 PK.21th Jun 1924Box 45 \ 1  Scan320
Letter from Dunlop concerning the failure of certain tyres which had burst after short mileage in France.26th Jun 1924Box 45 \ 1  Scan321
Letter to the Dunlop Rubber Co. detailing the results and return of three tyres after testing in France.30th Jul 1923Box 45 \ 1  Scan322
Log of Dunlop tyre positions and performance on vehicle 98 NK.30th Jun 1924Box 45 \ 1  Scan323
Positions and performance of Dunlop tyres on vehicle 35 PK.30th Jun 1924Box 45 \ 1  Scan324
Position and numbers of 'Dunlop' tyres on a 35 PK vehicle.5th Jul 1924Box 45 \ 1  Scan325
Weekly report on the mileage and condition of Dunlop S.S. Cord tyres on a 35 PK vehicle.5th Jul 1924Box 45 \ 1  Scan326
The performance and condition of 'Dunlop' tyres fitted to vehicle 98 NK.5th Jul 1924Box 45 \ 1  Scan327
Weekly tyre report for Dunlop S.S. cord tyres on vehicle 98 NK.5th Jul 1924Box 45 \ 1  Scan328
Comparing the performance of Rapson and Dunlop tyres during tests in connection with 4-wheel brakes.23th Sep 1924Box 45 \ 1  Scan329
Bar chart comparing the mileage performance of various tyre brands and types.7th Oct 1984Box 45 \ 1  Scan330
Severely faded document with illegible content, marked with a red ink stamp.7th Oct 1984Box 45 \ 1  Scan331
Requesting a requisition form for 18 loose flanges for straight sided rims recently delivered from Messrs. Dunlop.6th Oct 1924Box 45 \ 1  Scan332
To obtain 18 loose flanges from Messrs. Dunlop.7th Oct 1924Box 45 \ 1  Scan333
Cancellation of a visit to the Dunlop tyre factory.13th Oct 1924Box 45 \ 1  Scan334
Letter to Dunlop Rubber Co. Ltd. requesting information on the increase of effective tyre diameter with speed.19th Jun 1925Box 45 \ 1  Scan335
Letter from Dunlop Rubber Co Ltd acknowledging a query regarding the increase in effective tyre diameter with speed.20th Jun 1925Box 45 \ 1  Scan336
The receipt and testing of 6 Ply Tyres from The Dunlop Rubber Co.22th Jun 1925Box 45 \ 1  Scan337
Letter from Dunlop discussing the results of experiments on effective tyre radius at various speeds.25th Jun 1925Box 45 \ 1  Scan338
Continuation sheet from Dunlop Rubber Co. Ltd. detailing tyre performance data.1st Jun 1925Box 45 \ 1  Scan339
Graph showing the increase in effective radius of a 33x5 tyre relative to speed, under specific load and inflation conditions.1st Jun 1925Box 45 \ 1  Scan340
Letter to The Dunlop Rubber Co. thanking them for providing required information.30th Jun 1925Box 45 \ 1  Scan341
Essential nature of a locking device for straight sided rims.31th Aug 1925Box 45 \ 1  Scan342
Short report on the performance of Dunlop tyres regarding noise and non-skid qualities.16th Oct 1925Box 45 \ 1  Scan343
Letter to Dunlop Rubber Co. comparing the wear of French and British tyres.19th Oct 1925Box 45 \ 1  Scan344
Letter from Dunlop suggesting a steering modification to prevent 'shimmy'.21th Oct 1925Box 45 \ 1  Scan345
Letter from Dunlop Rubber Co. Ltd. discussing steering mechanics and wheel movement to prevent tread wear.30th Oct 1925Box 45 \ 1  Scan346
Letter to the Dunlop Rubber Co. requesting figures on the rolling resistance of various tyre types.30th Oct 1925Box 45 \ 1  Scan347
Letter from Dunlop Rubber Co Ltd discussing the adoption of the 21' rim as the standard diameter for low pressure tyres and production statistics.5th Nov 1925Box 45 \ 1  Scan348
Rims and tyres, detailing correspondence with Dunlop and Michelin.6th Nov 1925Box 45 \ 1  Scan349
Letter from Dunlop Rubber Co. regarding the market prevalence and production of 21-inch rims and tyres.5th Nov 1925Box 45 \ 1  Scan350
Letter from Dunlop Rubber Co. Ltd. concerning tests on the rolling resistance of tyres.10th Nov 1925Box 45 \ 1  Scan351
Graph from Dunlop Rubber Co. Ltd. plotting rolling resistance against time as a tyre heats up from a cold start.19th Nov 1925Box 45 \ 1  Scan352
Specification sheet detailing the weights of Dunlop standard and wheel base wheel assemblies.19th Nov 1925Box 45 \ 1  Scan353
Query from The Dunlop Company about the performance of sample Triple Stud Covers under observation.20th Nov 1925Box 45 \ 1  Scan354
Blueprint comparing the dimensions and specifications for different Dunlop tyres and well base wheels.28th Feb 1928Box 45 \ 1  Scan355
The transport of tyres, tubes, and a hub to France, with a request for invoicing.15th Mar 1926Box 45 \ 1  Scan356
Confirming the despatch of 12 Dunlop Covers and Tubes for Mr. G.W. Hancock.26th Mar 1926Box 45 \ 1  Scan357
Order for three Dunlop Cord outer covers for chassis 9-G-111 ('India').3rd May 1926Box 45 \ 1  Scan358
Request to despatch 6 tyres left at Chateauroux to The Dunlop Rubber Co. for their development department.15th Jun 1926Box 45 \ 1  Scan359
Despatch of 6 tyres for chassis 10-G-111 to The Dunlop Rubber Company.17th Jun 1926Box 45 \ 1  Scan360
Correspondence regarding the whereabouts of Dunlop Medium Pressure Tyres used in tests in France.10th Aug 1926Box 45 \ 1  Scan361
Comparison of road shocks and ride comfort between standard high-pressure tyres and 6.75 inch Dunlop balloon tyres.1st Aug 1926Box 45 \ 1  Scan362
Copy of correspondence from Paris regarding Dunlop Tyres sent for chassis 10.G.III.25th Aug 1926Box 45 \ 1  Scan363
Results of high-speed wobble tests on three different sizes of tyres in France.10th Sep 1926Box 45 \ 1  Scan364
Visit to Dunlop Co. discussing modifications to Triple Stud and 6.75' Balloon tyres.9th Sep 1926Box 45 \ 1  Scan365
Comparison of Dunlop triple stud and traction tread tyres, focusing on high-speed wobble and anti-skid performance.14th Sep 1926Box 45 \ 1  Scan366
Availability of modified 6.75' Dunlop tyres and placing an order for existing stock.14th Sep 1926Box 45 \ 1  Scan367
Letter to Dunlop Rubber Co. Ltd. concerning the testing of tyre treads to avoid high-speed wobbles on the 40/50 HP chassis.15th Sep 1926Box 45 \ 1  Scan368
Letter to Dunlop requesting tyre performance figures and information on inner tube availability.21th Sep 1926Box 45 \ 1  Scan369
Objections to Dunlop's new triple stud 6.75' tyres, which replaced the traction tread pattern, citing issues with high-speed wobbles.21th Sep 1926Box 45 \ 1  Scan370
Tyre supply issues with Dunlop, specifically concerning high-speed wobbles and the transition to well-based wheels.21th Sep 1926Box 45 \ 1  Scan371
Manufacture and testing of 6.75' Dunlop tyres with traction tread.1st Sep 1926Box 45 \ 1  Scan372
Patent for noise elimination and suggesting its application for reducing tyre noise with Messrs. Dunlop.10th Oct 1926Box 45 \ 1  Scan373
Communication confirming a wire and discussing the sourcing of 6.75' tyres with traction tread for testing.10th Oct 1926Box 45 \ 1  Scan374
Letter to the Dunlop Rubber Co. Ltd. inquiring about available tyre sizes and experiments with heavy inner tubes to reduce high-speed wobbles.23th Oct 1926Box 45 \ 1  Scan375
Standardization of low and medium pressure tyre descriptions based on their section size.23th Oct 1926Box 45 \ 1  Scan376
To prevent confusion in the nomenclature of tyres for the 20 HP and 40/50 HP chassis.25th Oct 1926Box 45 \ 1  Scan377
Letter from Dunlop Rubber Co. regarding tyre sizes, experiments with heavy inner tubes for wheel wobble, and a road wheel drum testing rig.27th Oct 1926Box 45 \ 1  Scan378
Letter from Dunlop Rubber Co. regarding a request for information on tyre sizes for cars and available competitive makes.3rd Nov 1926Box 45 \ 1  Scan379
Specification sheet detailing tyre equipment and available makes for various car models.5th Nov 1926Box 45 \ 1  Scan380
Tyre options for 21' rims on the 40/50 HP car and fitting instructions for traction tread tyres.5th Nov 1926Box 45 \ 1  Scan381
Standardising tyre terminology for non-technical customers, proposing specific names for tyres on Phantom and 20 HP models.6th Nov 1926Box 45 \ 1  Scan382
List of moments of inertia for various wheel and tyre combinations to investigate high-speed wobbles.26th Nov 1926Box 45 \ 1  Scan383
Performance data table for 33 x 6.75' tyres at 35 lbs/sq.in pressure.30th Nov 1926Box 45 \ 1  Scan384
Performance data tables for 33 inch Solid Tyres and 33 X 5 inch S.S. tyres.30th Nov 1926Box 45 \ 1  Scan385
Tyre recommendations for a high-speed chassis, advising high pressure tyres over the 6.75' model.1st Jan 1927Box 45 \ 2  Scan001
Index page for a report on the fundamentals of car performance focusing on tyres.1st Jan 1927Box 45 \ 2  Scan002
The fundamentals of car performance, specifically the effect of out-of-balance and out-of-truth tyres on steering.1st Jan 1927Box 45 \ 2  Scan003
Technical bulletin discussing the causes and solutions for high speed wobbles, focusing on tyre pressure and size.1st Jan 1927Box 45 \ 2  Scan004
The causes of high-speed wobbles, including tyre tread patterns, irregular wear, and inflation pressure.1st Jan 1927Box 45 \ 2  Scan005
Tyre pressures, stability, and vehicle wobbles.1st Jan 1927Box 45 \ 2  Scan006
Factors affecting tyre wear, including steering, temperature, and a comparison between British and Continental conditions.1st Jan 1927Box 45 \ 2  Scan007
The effect of tyre types and inflation pressure on petrol consumption, with an accompanying graph.1st Jan 1927Box 45 \ 2  Scan008
Two graphs comparing the rolling resistance of different tyres against varying inflation pressures, both in machine tests and on the road.1st Jan 1927Box 45 \ 2  Scan009
Report page discussing the impact of balloon tyres on petrol consumption, featuring a graph on tyre rolling resistance.1st Jan 1927Box 45 \ 2  Scan010
The characteristics of balloon tyres, their effect on suspension, and riding comfort.1st Jan 1927Box 45 \ 2  Scan011
Comparison of effective circumference between high pressure and balloon tyres for 20 HP and 40/50 HP models.1st Jan 1927Box 45 \ 2  Scan012
Graph comparing the increase in effective radius with speed for two different tyre types, alongside a discussion on tyre noise.1st Jan 1927Box 45 \ 2  Scan013
Report page discussing tyre characteristics, including the rejection of triple stud treads and the variation in non-skid properties of balloon tyres with wear.6th Jan 1927Box 45 \ 2  Scan014
Comparison of recommended and not recommended Dunlop tyres and well-base wheels.6th Jan 1927Box 45 \ 2  Scan015
Tyre noise issues, conversations with Dunlop, and potential solutions like subframe mounting.2nd Feb 1927Box 45 \ 2  Scan016
Proposing a plan to investigate tyre noises on Mr. Spyers' car by collaborating with Dunlop.17th Feb 1927Box 45 \ 2  Scan017
Letter to the Dunlop Rubber Co. regarding a car with peculiar tyre noises for them to test.1st Mar 1927Box 45 \ 2  Scan018
Letter from Dunlop Rubber Co. Ltd. to the Experimental Department arranging a car demonstration.2nd Mar 1927Box 45 \ 2  Scan019
Letter to Dunlop Rubber Co. regarding the unavailability of a car for a scheduled demonstration.3rd Mar 1927Box 45 \ 2  Scan020
Letter from Dunlop Rubber Co. Ltd. providing a reminder about a car for demonstration that was previously unavailable.14th Mar 1927Box 45 \ 2  Scan021


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