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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Letter to Hughes-Johnson Stampings Ltd. regarding forging designs and progress on connecting rods.25th Feb 1937Box 8 \ 3  03-page05
Letter from The Hughes-Johnson Stampings Ltd confirming a meeting with Mr. Reynolds.1st Mar 1937Box 8 \ 3  03-page06
Production and feasibility of using forge-finished connecting rods for the Wraith model.3rd Mar 1937Box 8 \ 3  03-page07
Letter to The Hughes-Johnson Stampings Ltd. requesting a progress update on forge finished connecting rods.20th Mar 1937Box 8 \ 3  03-page08
Letter from a drop-forging contractor regarding the production status of Con Rod dies.26th Mar 1937Box 8 \ 3  03-page09
Follow-up letter regarding the status of forged finished connecting rods being prepared by a supplier.13th Apr 1937Box 8 \ 3  03-page10
Letter from The Hughes-Johnson Stampings Ltd. regarding production difficulties with a connecting rod.19th Apr 1937Box 8 \ 3  03-page11
The investigation into producing forge-finished Wraith connecting rods.20th Apr 1937Box 8 \ 3  03-page12
Modification to the panel milling process for Wraith III & Bentley III connecting rods.15th Sep 1937Box 8 \ 3  03-page13
Instruction memo for parts related to the Wraith III Chassis connecting rod.23th Sep 1937Box 8 \ 3  03-page14
Instruction regarding new drawings and parts for the Wraith III Chassis Connecting Rod.1st Oct 1937Box 8 \ 3  03-page15
Cancelling a previous instruction for 6 sets of parts for the Wraith III Chassis Connecting Rod.28th Sep 1937Box 8 \ 3  03-page16
Release of 100 sets of connecting rods and bearings for the Wraith III, detailing three alternative bearing options.28th Jan 1938Box 8 \ 3  03-page17
The Connecting Rod Bush for Wraith III & Bentley III models.8th Feb 1938Box 8 \ 3  03-page18
New blueprints for a Wraith III chassis connecting rod with no shims and flanged bushes.13th May 1938Box 8 \ 3  03-page19
Request to supply a complete Wraith con-rod as a sample to be sent to America with A.C.9 alloy.8th Nov 1938Box 8 \ 3  03-page20
Proposal to test new 'Karc' bronze connecting rod bushes (E.51375) to reduce scrap caused by porosity.9th Jan 1939Box 8 \ 3  03-page21
The trial of 'Karo' Bronze little end bushes for Wraith connecting rods.11th Jan 1939Box 8 \ 3  03-page22
Producing and fitting four sets of 'Karo' Bronze little end bushes for the Wraith connecting rod.23th Jan 1939Box 8 \ 3  03-page23
Allocation and fitting instructions for 'Karo' and Vandervell bushes in connecting rods for various units.23th Jan 1939Box 8 \ 3  03-page24
Cost comparison for Wraith connecting rod bushes using Carobronze Tube versus BZ/FC Cast Bar.3rd Feb 1939Box 8 \ 3  03-page25
Departmental memo discussing axle clearances and the design of a chassis for a worm geared axle.12th May 1911Box 8 \ 4  04-page001
Expressing a strong opinion against the design of an arched back axle.30th May 1911Box 8 \ 4  04-page002
List comparing axle clearance measurements of various competitor motor cars.4th Oct 1911Box 8 \ 4  04-page003
Departmental memo regarding Mud Guards, circulating a letter from Mr. Johnson.4th Oct 1911Box 8 \ 4  04-page004
Dangerous mud-guards on a trial car and a directive to stop calling it the 'Speed Car'.3rd Oct 1911Box 8 \ 4  04-page005
Instruction to arrange a minimum clearance of .015' for crankshaft bearings, with an exception for the main rear bearing.20th Oct 1911Box 8 \ 4  04-page006
Manufacture of cars with greater clearance for the Indian business.27th Nov 1911Box 8 \ 4  04-page007
Minutes from a meeting discussing increasing road clearance for Colonial and Indian cars.30th Nov 1911Box 8 \ 4  04-page008
Hand-drawn dimensional comparison between the '1700 Type' and '1700 Colonial Type' models.1st Mar 1911Box 8 \ 4  04-page009
Ground clearance modifications for 'Colonial' cars, specifically the fitting of smaller flywheels and spring drive couplings.2nd May 1912Box 8 \ 4  04-page010
Letter to Mr. Johnson regarding discrepancies in ground clearance between drawings and the actual chassis produced.20th May 1912Box 8 \ 4  04-page011
Vehicle clearances for different wheel sizes and outlining potential modifications to increase it, with a note on chassis 1875.20th May 1912Box 8 \ 4  04-page012
Ground clearance options for Mr Morris's new car with various modifications and the logistics of changing flywheels.21th May 1912Box 8 \ 4  04-page013
Departmental memo demanding an explanation for a serious discrepancy in flywheel guard clearance measurements between drawings and the actual chassis.21th May 1912Box 8 \ 4  04-page014
Departmental memo regarding the differing flywheel guard clearances on standard and Colonial type chassis.21th May 1912Box 8 \ 4  04-page015
Departmental memo regarding the stopping of chassis delivery to change flywheels, impacting ground clearance and engine performance.31th May 1912Box 8 \ 4  04-page016
List of ground clearance measurements for the 1900 Chassis.3rd Jun 1912Box 8 \ 4  04-page017
List of ground clearance measurements for the 1800 Type Chassis.3rd Jun 1912Box 8 \ 4  04-page018
Departmental memo requesting a Technical Committee meeting to review a 5/8' ground clearance.3rd Jun 1912Box 8 \ 4  04-page019
Departmental memo confirming the handover of clearance sheets for 1800 and 1900 type chassis.5th Jun 1912Box 8 \ 4  04-page020
From Mr Spinney to Mr Nadin regarding ground clearances with different wheel and flywheel sizes.16th Apr 1912Box 8 \ 4  04-page021
Departmental memo regarding ground clearances, referencing two attached memos.5th Jun 1912Box 8 \ 4  04-page022
Departmental memo following up on a query regarding ground clearance.5th Jun 1912Box 8 \ 4  04-page023
Departmental memo discussing the road clearance of the 1900 series vehicle based on different flywheel and wheel sizes.6th Jun 1912Box 8 \ 4  04-page024
Vehicle road clearance calculations based on wheel size and addressing an error where tinsmiths deviated from drawings.3rd May 1912Box 8 \ 4  04-page025
Departmental memo discussing committee recommendations for increasing clearance on Colonial cars for Mr Royce's consideration.3rd May 1912Box 8 \ 4  04-page026
Copy of a memo from F.H. Royce to Claude Johnson regarding road clearance and the slope of the transmission.13th Jun 1912Box 8 \ 4  04-page027
To the Technical Committee regarding ground clearance and flywheel guards.20th Jun 1912Box 8 \ 4  04-page028
Departmental memo regarding difficulties in achieving the specified ground clearance for a chassis model.22th Jun 1912Box 8 \ 4  04-page029
Departmental memo specifying minimum ground clearances for various chassis types based on flywheel and wheel sizes.3rd May 1912Box 8 \ 4  04-page030
Departmental memo discussing chassis ground clearance and the rationale for spring setup to handle maximum load.3rd May 1912Box 8 \ 4  04-page031
Vehicle ground clearance, specifically concerning the silencer, spring camber, and flywheel guard.3rd May 1912Box 8 \ 4  04-page032
Departmental memo regarding insufficient ground clearance on a chassis and the need to alter specifications.3rd May 1912Box 8 \ 4  04-page033
Clarification on the information required for ground and road clearance on chassis 2006.26th Jun 1912Box 8 \ 4  04-page034
Request for road clearance information for a chassis with different tyre and axle setups.27th Jun 1912Box 8 \ 4  04-page035
Cover letter forwarding minutes from T.C. meetings concerning petrol tank supports, front floorboards, and ground clearance.28th Jun 1912Box 8 \ 4  04-page036
Road clearance for Chassis 2006 with different tyre and axle configurations.29th Jun 1912Box 8 \ 4  04-page037
The results of ground clearance tests on three different car chassis under flat spring camber conditions.2nd Jul 1912Box 8 \ 4  04-page038
Departmental memo discussing frame bend tests, clearances, and potential modifications for future car chassis.22th May 1912Box 8 \ 4  04-page039
Departmental memo detailing the components used for tests, including a standard chassis, large flywheel, and wheel dimensions.22th May 1912Box 8 \ 4  04-page040
Chassis modifications and ground clearances for different flywheel and wheel combinations.4th Jul 1912Box 8 \ 4  04-page041
Clearance measurements for three specific chassis (2025E, 2027, and 2028).4th Jul 1912Box 8 \ 4  04-page042
Chassis frame testing, detailing measurements and observations on deflection under load.4th Jul 1912Box 8 \ 4  04-page043
Chassis frame trussing, clearances, and future car transmission design.4th Jul 1912Box 8 \ 4  04-page044
Note on improving clearance by fitting a small flywheel.11th Jul 1912Box 8 \ 4  04-page045
Ground clearance, specifically discussing the standardization of exhaust pipes and flywheels.11th Jul 1912Box 8 \ 4  04-page046
Concluding page of a typed memo by T.B. Barrington.15th Jul 1912Box 8 \ 4  04-page047
Departmental memo regarding ground clearance and slipping issues with cotton fabric clutches.15th Jul 1912Box 8 \ 4  04-page048
Departmental memo concerning vehicle ground clearance specifications.25th Jul 1912Box 8 \ 4  04-page049
Customer complaint about a flywheel striking the road on a new car.31th Jul 1912Box 8 \ 4  04-page050
Letter detailing a safety concern about the low clearance of the flywheel shield on certain bridges.2nd Aug 1912Box 8 \ 4  04-page051
Departmental memo concerning a customer complaint from a Mr. Whittington and the proposed solution of fitting a smaller flywheel.2nd Aug 1912Box 8 \ 4  04-page052
Letter regarding car availability over the winter and a concern about a smaller flywheel.5th Aug 1912Box 8 \ 4  04-page053
Letter regarding the fitting of larger wheels and tyres.7th Aug 1912Box 8 \ 4  04-page054
Letter to a customer regarding the fitting of a smaller fly-wheel and the option of larger wheels for clearance.7th Aug 1912Box 8 \ 4  04-page055
Departmental memo discussing ground clearance tests, comparing inverted and three-quarter elliptic springs.16th Aug 1912Box 8 \ 4  04-page056
Departmental memo requesting a copy of test results for internal records.3rd May 1912Box 8 \ 4  04-page057
Departmental memo discussing the road clearance under the flywheel guard for chassis 1872.17th Aug 1912Box 8 \ 4  04-page058
Page two of a departmental memo about alterations required beyond fitting a light flywheel for a customer.22th May 1912Box 8 \ 4  04-page059
Customer complaint regarding flywheel clearance on Chassis 1872.19th Aug 1912Box 8 \ 4  04-page060
Departmental memorandum concerning a flywheel and wheel clearance issue on Mr Whittington's car, number 1872.22th Aug 1912Box 8 \ 4  04-page061
Departmental memo regarding modifications to increase a customer's car clearance by possibly fitting a smaller flywheel and larger wheels.3rd Sep 1912Box 8 \ 4  04-page062
Ground clearance on bumpy roads, gradient measurement accuracy, and a failed hill start test.12th Sep 1912Box 8 \ 4  04-page063
Departmental memo commenting on a car's ability to climb a 35% gradient.22th May 1912Box 8 \ 4  04-page064
Insufficient ground clearance on car 1739, causing the flywheel guard to foul on roads in Scotland.15th Sep 1912Box 8 \ 4  04-page065
Memo detailing poor road conditions and the unsuitability for a modern car, with observations of other vehicles.30th Apr 1912Box 8 \ 4  04-page066
Memo about a location near Nisy where the King goes to shoot.15th Oct 1912Box 8 \ 4  04-page067
To Mr. Johnson concerning an investigation into gauges for road clearance.15th Oct 1912Box 8 \ 4  04-page068
The correct positioning of parts relative to the side members of the frame.8th Oct 1937Box 8 \ 4  04-page069
To Mr. Barrington concerning Mr. Royce's opinion on road clearance issues for standard practice chassis.28th Oct 1912Box 8 \ 4  04-page070
To Mr Platford regarding Mr Royce's opinion on road clearance issues.29th Oct 1912Box 8 \ 4  04-page071
Improvements to front suspension, suggesting increased clearance or camber to prevent breakages.15th Dec 1913Box 8 \ 4  04-page072
Ground clearance of a proposed new chassis.13th May 1926Box 8 \ 4  04-page073
Undershield ground clearance issues and proposing a new testing method.14th Jun 1926Box 8 \ 4  04-page074
The minimum passable ground clearance for the undershield on 20-HP and 40/50 HP chassis.16th Jun 1926Box 8 \ 4  04-page075
Modifying the 20 HP undershield to improve ground clearance.8th Jun 1926Box 8 \ 4  04-page076
Modifications to the 20HP model undershields to prevent mud splashing and increase road clearance.1st Jul 1926Box 8 \ 4  04-page077
Sketch illustrating the 'India' change-speed mechanism and its floorboard clearances.7th May 1927Box 8 \ 4  04-page078
Need to adjust road clearance based on driving experience on bumpy roads in France.7th May 1927Box 8 \ 4  04-page079


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