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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Borg & Beck clutch experiment on a 25HP model, including suggested modifications and schematics.23th Aug 1932Box 5 \ 6  06-page183
Schemes for revised leveranges for the 20/25 Clutch.25th Aug 1932Box 5 \ 6  06-page184
Faults and modifications for the Peregrine & J.S. Clutch mechanism.9th Sep 1932Box 5 \ 6  06-page185
Confirmation of a phone message regarding the redesign and simplification of the J.J. & Peregrine clutch.16th Sep 1932Box 5 \ 6  06-page186
Slipping clutches on 25 HP models due to automatic lubrication and the solution to disable it.23th Sep 1932Box 5 \ 6  06-page187
Issues and design corrections for single and multi-plate clutches.11th Oct 1932Box 5 \ 6  06-page188
Testing of three modified clutches and a patent application for an improved actuating mechanism.4th Oct 1932Box 5 \ 6  06-page189
Suggested modification to the 25HP clutch to align it with improvements made for other models.18th Oct 1932Box 5 \ 6  06-page190
Three methods for achieving satisfactory engagement in single-plate clutches.12th Dec 1932Box 5 \ 6  06-page191
Archival note referencing the location of previous correspondence.2nd Jan 1931Box 5a \ 1  01-page001
Potential engine specification changes for the 25HP model, considering bore, stroke, and overall capacity.2nd Jan 1931Box 5a \ 1  01-page002
Proposed engine modifications and performance issues with vehicle 18-EX on rough roads.3rd Jan 1931Box 5a \ 1  01-page003
Compromise for a 4.5 litre engine for the 20/25 HP model.3rd Jan 1931Box 5a \ 1  01-page004
Proposing a modification to the 25HP induction stand pipe to improve starting.6th Jan 1931Box 5a \ 1  01-page005
The standardization of parts following the testing of vehicle 18-G4 in France.6th Jan 1931Box 5a \ 1  01-page006
List of modifications to be standardized as a result of a 107,000 mile test on chassis 18-0-IV.6th Jan 1931Box 5a \ 1  01-page007
List of modifications and updates for various vehicle components.6th Jan 1931Box 5a \ 1  01-page008
List of specifications and modifications for various engine components and assemblies.6th Jan 1931Box 5a \ 1  01-page009
Performance implications of increasing the 25 HP engine's displacement to 4.7 litres, with weight comparisons to a Chrysler chassis.6th Jan 1931Box 5a \ 1  01-page010
Preliminary specification of 25HP. chassis.8th Jan 1931Box 5a \ 1  01-page011
Outlining design suggestions for a new chassis, focusing on cost-saving measures and component interchangeability.9th Jan 1931Box 5a \ 1  01-page012
20/25 HP chassis fitted with a Brewster body and dummy shutters, and a wooden subframe for Phantom II cars.9th Jan 1931Box 5a \ 1  01-page013
Design specifications for the 25HP model, including the back axle, gearbox, and radiator.1st Jan 1931Box 5a \ 1  01-page014
Relaying a telegram regarding a specification agreement with Japan and proposing the design name 'Japan II'.13th Jan 1931Box 5a \ 1  01-page015
Preliminary general arrangement and modifications for a 28HP engine.13th Jan 1931Box 5a \ 1  01-page016
Page discussing the production flow and balance of R.H. and L.H. chassis.15th Jan 1931Box 5a \ 1  01-page017
New work programme, project progress, and the assignment of draughtsmen.15th Jan 1931Box 5a \ 1  01-page018
Outlining a proposed development and testing programme for an improved 20/25 HP model.5th Jan 1931Box 5a \ 1  01-page019
Production schedules, material ordering, and tooling for various chassis types.5th Jan 1931Box 5a \ 1  01-page020
Continued memorandum discussing manufacturing strategies, cost reduction, and production planning for chassis and aero programmes.16th Jan 1931Box 5a \ 1  01-page021
The design of a connecting rod for the 26 HP Chassis.16th Jan 1931Box 5a \ 1  01-page022
Cover memo for a compiled list of economy suggestions and decisions, with a mention of further suggestions from a meeting.16th Jan 1931Box 5a \ 1  01-page023
List of suggestions to reduce the cost of the 25HP chassis and the decisions made.31th Dec 1930Box 5a \ 1  01-page024
Technical document outlining potential design changes and cost savings for various vehicle components.31th Dec 1930Box 5a \ 1  01-page025
Potential cost savings on various vehicle components.31th Dec 1930Box 5a \ 1  01-page026
Discussion document on potential cost savings and design improvements for the magneto, gearbox selector, and gearbox covers.31th Dec 1930Box 5a \ 1  01-page027
Potential cost savings on various gearbox components and the carburetter.31th Dec 1930Box 5a \ 1  01-page028
Cost-saving analysis for various engine components.31th Dec 1930Box 5a \ 1  01-page029
Potential cost savings on various automotive components through design modifications.31th Dec 1930Box 5a \ 1  01-page030
Potential cost-saving measures on various vehicle components.31th Dec 1930Box 5a \ 1  01-page031
Potential cost savings on frame, steering, and brake components.31th Dec 1930Box 5a \ 1  01-page032
Potential cost savings from modifying undershields, brakes, and radiator cross members.1st Jan 1931Box 5a \ 1  01-page033
Proposed modifications to the rear axle and brake gear for a car with a larger engine.1st Jan 1931Box 5a \ 1  01-page034
Supply of information and workflow for the 'JAPAN III' project.18th Jan 1931Box 5a \ 1  01-page035
Status update on crankcase and cylinder design for the 'JAPAN III' project, referencing various drawings.18th Jan 1931Box 5a \ 1  01-page036
Continued memorandum detailing work on induction pipes, oil supply, and cylinder components.18th Jan 1931Box 5a \ 1  01-page037
Proposing the name 'JAPAN III' for the 28 HP chassis to prevent confusion.20th Jan 1931Box 5a \ 1  01-page038
Secret internal memorandum regarding the preliminary specification for the 20/25 Japan III model.20th Jan 1931Box 5a \ 1  01-page039
Preliminary specification for a new car model, codenamed 'Japannth'.8th Jan 1931Box 5a \ 1  01-page040
Series of suggestions for a new chassis design, focusing on cost-saving measures and component interchangeability for a 25HP model.8th Jan 1931Box 5a \ 1  01-page041
Typed page discussing the production flow balance of right-hand and left-hand chassis.20th Jan 1931Box 5a \ 1  01-page042
Proposal to use a right-hand engine in a 'Japan 3' left-hand drive chassis.20th Jan 1931Box 5a \ 1  01-page043
The 'Japan III' project, discussing the development and expenditure on left-hand drive chassis.1st Jan 1921Box 5a \ 1  01-page044
Design modifications and simplifications for the 'Japan Engine'.21th Jan 1931Box 5a \ 1  01-page045
Design note with a sketch of a starter handle shaft tube, with a related telegram confirmation on design simplicity.21th Jan 1931Box 5a \ 1  01-page046
Revisions to the 'Japan 3' engine scheme, including shaft diameters and cylinder skirts.22th Jan 1931Box 5a \ 1  01-page047
Modifications to the petrol tank for the 'Japan 3' project, including increased capacity and simplified construction.23th Jan 1931Box 5a \ 1  01-page048
Modifications to the design of torque arms, engine suspension, and gear arrangement for the 'JAPAN 3' project.24th Jan 1931Box 5a \ 1  01-page049
Design considerations for the 'Japan 3' engine, focusing on spring drive, bearings, and crankchamber casting.28th Jan 1931Box 5a \ 1  01-page050
Review of faults on the 'Japan III' 25 HP car, specifically addressing issues with exhaust pipes and slipper wheels.26th Jan 1931Box 5a \ 1  01-page051
Engine vibrations, dynamo output, and ignition complaints for the 25 HP car.26th Jan 1933Box 5a \ 1  01-page052
The development of carburettors, petrol pumps, shock absorbers and starter motors.26th Jan 1933Box 5a \ 1  01-page053
Blueprint Loc. 2869, illustrating the proposed arrangement of units for both right and left-hand chassis.27th Jan 1931Box 5a \ 1  01-page054
Proposed arrangement of engine accessories for Japan III, with rear timing gears suitable for either right-hand or left-hand steering.21th Jan 1931Box 5a \ 1  01-page055
Design proposals and arrangements for the 'Japan 3' engine.21th Jan 1931Box 5a \ 1  01-page056
Sketches and notes on the design of a monocle plate, crossmember, and bearing arrangements.29th Jan 1931Box 5a \ 1  01-page057
Confidential summary discussing engine vibrations, balancing, design schemes for 'Japan 3', and a proposed new engine configuration.29th Jan 1931Box 5a \ 1  01-page058
Technical discussion on engine vibrations, flywheel instability, and potential design improvements.29th Jan 1931Box 5a \ 1  01-page059
Engine balancing, crankshaft stresses, steering issues, and the choice of a 12-cylinder engine for high speeds.29th Jan 1931Box 5a \ 1  01-page060
'Japan 3' engine design, comparing 6 and 12-cylinder configurations.29th Jan 1931Box 5a \ 1  01-page061
Engine design choices for the Japan 3 engine, including crank pins, ignition, and connecting rod lengths.29th Jan 1931Box 5a \ 1  01-page062
Breakage of a low inertia slipper wheel, crankshaft vibrations, and engine performance concerns.1st Feb 1931Box 5a \ 1  01-page063
Flywheel vibration issues and potential solutions for the Japan 3 engine.2nd Mar 1931Box 5a \ 1  01-page064
Specification of switches, instruments, and lamps for the 'Japan III' project, with comparisons to a Humber car.26th Feb 1931Box 5a \ 1  01-page065
Inclusion of clocks, front aprons, and bonnet ventilators on car chassis.24th Feb 1931Box 5a \ 1  01-page066
Modifications to the Japan S. Engine, specifically the connecting rod and cylinder head.14th Feb 1931Box 5a \ 1  01-page067
Design modifications and suggestions for various engine components.14th Feb 1931Box 5a \ 1  01-page068
The design modifications for valve gear pedestals and end cylinder studs.1st Feb 1931Box 5a \ 1  01-page069
Confidential memo discussing the competitive threat of the 8-litre Bentley and its performance characteristics compared to the Phantom II.1st Feb 1931Box 5a \ 1  01-page070
Challenges of developing a 12-cylinder car ('double 28HP') in time for the 1931 Show, considering other company commitments and past failures of similar large cars.1st Feb 1931Box 5a \ 1  01-page071
Confidential memo discussing the purchase of a 12-cylinder Cadillac for competitive analysis and developments in gear ratios and new models.5th Feb 1931Box 5a \ 1  01-page072
Confidential letter regarding Bentley's success and the importance of competitive analysis.5th Feb 1931Box 5a \ 1  01-page073
Proposed modifications to the Japan 3 Engine, concerning connecting rod length and flywheel/clutch assembly.1st Feb 1931Box 5a \ 1  01-page074
Design changes and stress calculations for cylinder studs, a valve cover, and spark plug holes.6th Feb 1931Box 5a \ 1  01-page075
With a sketch discussing the design and manufacturing methods for a cast dashboard for the Japan III model.6th Feb 1931Box 5a \ 1  01-page076
Layout and sourcing of controls and instruments for the Japan 3 chassis.6th Feb 1931Box 5a \ 1  01-page077
Secret memorandum calling a conference to discuss progress on the 'JAPAN III' car project, noting delays and reaffirming the goal of selling cars.3rd Mar 1931Box 5a \ 1  01-page078
Secret memorandum discussing the layout and features of vehicle controls for the 'Japan 3' project.6th Feb 1931Box 5a \ 1  01-page079
Design considerations and problems for the 'Japan 3' engine, including flywheel fixing, bearings and valve types.7th Feb 1931Box 5a \ 1  01-page080
Accompanying a revised drawing with modifications, noting it is not to scale but includes necessary dimensions.7th Feb 1931Box 5a \ 1  01-page081
Two proposed modifications to the Japan S. engine concerning the combustion chamber and crankpin diameter.1st Feb 1931Box 5a \ 1  01-page082
Calculations for the cone mounting on the 'JAPAN 3' engine's rear end, referencing print Lec.2877.28th Feb 1931Box 5a \ 1  01-page083
Design proposals for the engine's front-end suspension and fan pulley drive.28th Feb 1931Box 5a \ 1  01-page084
Performance improvements for the 25 HP engine, detailing modifications and test results at Brooklands.13th Mar 1931Box 5a \ 1  01-page085
Comparison table of quarter-mile and lap speeds for various car models and chassis configurations.28th Apr 1930Box 5a \ 1  01-page086
Progress report on the 'Japan 3' E. & D. Sections project, detailing component status and drawing numbers.14th Mar 1931Box 5a \ 1  01-page087
List of drawing numbers and completion status for various engine component sections.14th Mar 1931Box 5a \ 1  01-page088
Status list of drawing numbers for various engine and chassis components.14th Mar 1931Box 5a \ 1  01-page089
Table outlining drawing numbers and remarks for various vehicle electrical components.16th Mar 1931Box 5a \ 1  01-page090
Analysing a chart from Rolls-Royce of America regarding a proposed 25 HP car engine in comparison to American competitors.16th Mar 1931Box 5a \ 1  01-page091


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