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).
Rolls-Royce Experimental Archives                
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DescriptionDateIdentifier
Sluggishness in the India change speed lever and requesting tests to inform modifications for a new gearbox.8th Apr 1926Box 15 \ 5  Scan005
Notice detailing modifications and corrections for the E.A.C.VIII gearbox, including a list of updated part numbers.29th Apr 1926Box 15 \ 5  Scan006
Requested modifications to a gearbox mechanism, including sketches.26th Jun 1926Box 15 \ 5  Scan007
Examination of a faulty change speed mechanism on a 12-EX car, identifying the cause and the implemented solution.8th Jul 1926Box 15 \ 5  Scan008
Diagram of a Change Speed Mechanism showing deflection measurements in inches.8th Jul 1926Box 15 \ 5  Scan009
The reverse side of a document page featuring a red archival stamp.8th Jul 1926Box 15 \ 5  Scan010
Alterations to the rear brake differentials and related components.27th Aug 1926Box 15 \ 5  Scan011
Proposal to fit 13/47 ratio bevels in the rear axle of the EAC.7 chassis and instruct a suitable speedometer.10th Sep 1926Box 15 \ 5  Scan012
Standardisation of 'D' Type C.H.N.S. keyed type change gear shaft with a modified bush and spring.24th Sep 1926Box 15 \ 5  Scan013
Testing and implementation of a new direct drive scheme for the Phantom gearbox, urging for it to replace the old system.4th Oct 1926Box 15 \ 5  Scan014
Experimental application of a direct drive scheme to the Phantom gear box.5th Oct 1926Box 15 \ 5  Scan015
Costed alteration to a standard sheet for Change Gear and Brake Operating Mechanism.13th Oct 1926Box 15 \ 5  Scan016
Alteration to the 'D' Type keyed change gear shaft with a modified bush and bearing.24th Sep 1926Box 15 \ 5  Scan017
Standardisation of chassis parts, noting an alteration to improve the design of the change gear and brake operating mechanism.13th Oct 1926Box 15 \ 5  Scan018
Standardisation of a gearbox with modified selectors, pinions, and sliding wheels for definite end clearance.1st Oct 1926Box 15 \ 5  Scan019
Modifications to a hypoid gear rear axle gearbox.28th Oct 1926Box 15 \ 5  Scan020
Design and specifications for a new 11/41 ratio hypoid gear.29th Oct 1926Box 15 \ 5  Scan021
Standardisation sheet for the Phantom gearbox, questioning the effect on existing stock.1st Nov 1926Box 15 \ 5  Scan022
Standardisation sheet concerning the Phantom Gearbox.4th Nov 1926Box 15 \ 5  Scan023
Provision of high gear ratios for 40/50 HP and 20 HP cars.16th Nov 1926Box 15 \ 5  Scan024
The assembly of a servo worm gear, requesting a specimen pair from Messrs. Bostock & Bramley.11th Nov 1927Box 15 \ 5  Scan025
Suppliers and design improvements for an integral gearbox servo worm drive.24th Nov 1927Box 15 \ 5  Scan026
Drawings for the EAC.10 gearbox and clutch casing, detailing modifications.25th Nov 1927Box 15 \ 5  Scan027
Modifications and axle ratio performance for the Sports Phantom, chassis 10-EX.29th Nov 1926Box 15 \ 5  Scan028
Oversight in brake operation and proposed modifications for the EAC-7 chassis.16th Dec 1926Box 15 \ 5  Scan029
The testing and fitting of a toothed direct drive motion shaft for a Phantom gearbox.17th Dec 1926Box 15 \ 5  Scan030
Modifications to the cutout operation mechanism, referencing Phantom designs.20th Jan 1927Box 15 \ 5  Scan031
Problem with low force from the friction head in the servo linkage and a proposed fix using a new square wire spring.7th Apr 1927Box 15 \ 5  Scan032
Design and use of different hypoid gears, specifically 1' and 2' off-set types.14th Apr 1927Box 15 \ 5  Scan033
Gear ratio for the EAC.10 gearbox speedometer drive.1st Dec 1927Box 15 \ 5  Scan034
The speedometer drive ratio for the EAC.10 gearbox to order the correct part.7th Dec 1927Box 15 \ 5  Scan035
Arrangement of the clutch, front brake differential, and related components, referencing several schematics.1st Dec 1927Box 15 \ 5  Scan036
Sending a filler for the EAC.10 gearbox and questioning the purpose of a second filler on the related EAC.7 model.9th Dec 1927Box 15 \ 5  Scan037
Pedal arrangement for the EAC.10 gearbox, referencing drawings N.schs. 2449 and 2531.23th Dec 1927Box 15 \ 5  Scan038
Query regarding the practicality of removing the gearbox without the engine on the EAC.10 model, considering the position of the cross member.1st Jan 1928Box 15 \ 5  Scan039
Correction to the EAC.10 gearbox casting.6th Feb 1928Box 15 \ 5  Scan040
The arrangement of brake differentials and the connection to the servo.2nd Feb 1928Box 15 \ 5  Scan041
Confirming the dispatch of detailed drawings for a change-speed gearbox.17th Feb 1928Box 15 \ 5  Scan042
Design alterations, focusing on the importance and challenges of reusing existing parts to minimize costs.13th Mar 1928Box 15 \ 5  Scan043
Delay in introducing smaller speedometers and the cost implications for various car series.20th Jul 1928Box 15 \ 5  Scan044
Design change for the brake countershaft on the gearbox, proposing a forged part.28th Aug 1928Box 15 \ 5  Scan045
Requesting clarification on the weight saving on the 'SS' engine unit gearbox.18th Sep 1928Box 15 \ 5  Scan046
Standardisation of a small dial speedometer for the 40/50 chassis.3rd Sep 1928Box 15 \ 5  Scan047
Standardisation form for a new chassis part, detailing the first chassis for fitting, test date, and associated costs.3rd Nov 1928Box 15 \ 5  Scan048
Modifications to the 'SS' gearbox undershield and associated parts.10th Oct 1928Box 15 \ 5  Scan049
Noisy gearboxes on the New Phantom due to the exhaust pipe affecting the alignment of the side shafts.15th Oct 1928Box 15 \ 5  Scan050
Letter discussing improving vehicle acceleration by adopting a lower gear and a combined freewheel and clutch mechanism.24th Oct 1928Box 15 \ 5  Scan051
Gearbox design, focusing on achieving a 3rd speed using an epicyclic gear unit as an alternative to a standard gearbox.24th Oct 1928Box 15 \ 5  Scan052
Alternative gearbox designs, focusing on the advantages of epicyclic units for achieving silent operation.7th Nov 1928Box 15 \ 5  Scan053
Methods for improving vehicle acceleration, including engine power and gearbox design.7th Nov 1928Box 15 \ 5  Scan054
Alternative gearbox designs, including epicyclic units, freewheels, and their controls.12th Nov 1928Box 15 \ 5  Scan055
Fixing an oil leak on 'SS' engines by modifying the timing gear lubrication system.12th Nov 1928Box 15 \ 5  Scan056
Sketch showing a restriction in a timing gears oil pipe for a Super Sports model.12th Nov 1928Box 15 \ 5  Scan057
Instruction from Mr. Royce to use a hardened steel bush and shaft to resolve a binding issue with the 'SS' change speed mechanism.28th Nov 1928Box 15 \ 5  Scan058
Specifying a different gearbox end for the speedometer drive on the 'SS' car compared to the standard 40/50 model.28th Nov 1928Box 15 \ 5  Scan059
Requesting the fitting of 4 solid engine feet and an experimental bracket to chassis 19-EX.13th Dec 1928Box 15 \ 5  Scan060
The difficulty of removing the gearbox on the 'SS' car, proposing a detachable front cross member as a solution.13th Dec 1928Box 15 \ 5  Scan061
Fault in the 'SS' gearbox preventing easy engagement of the reverse gear.17th Dec 1928Box 15 \ 5  Scan062
Investigation into difficulty engaging reverse gear on an 'SS' model car.17th Dec 1928Box 15 \ 5  Scan063
Visit by Mr. Hardy to Derby concerning the L.H. SS. gearbox.18th Dec 1928Box 15 \ 5  Scan064
Pause in the development of the L.H. SS. Gearbox, offering to share existing blueprints.20th Dec 1928Box 15 \ 5  Scan065
Modifications to the speedometer drive to create a single drive, omitting the one for the screen wiper.12th Jan 1929Box 15 \ 5  Scan066
Arguing for the adoption of an electrical screenwiper drive as standard, deleting the mechanical drive.30th Jan 1929Box 15 \ 5  Scan067
From EFC to Mr. Clough requesting details on axle ratios, tyre diameter, and gearbox ratios.1st Feb 1929Box 15 \ 5  Scan068
Specifications for the S.S. Chassis, including rear axle ratio, tyre options, and gearbox ratios.1st Feb 1929Box 15 \ 5  Scan069
Specification sheet for S.S. Chassis gear ratios, including engine and dynamo RPMs at various speeds.4th Feb 1929Box 15 \ 5  Scan070
Recommendation for a detachable front subframe cross member to facilitate the removal of the 'SS' gearbox.14th Feb 1929Box 15 \ 5  Scan071
Letter discussing the results of the 19-EX car report, focusing on lubrication and gearbox oil leak resolutions.19th Feb 1929Box 15 \ 5  Scan072
Instructions for fitting a baffle plate and new tyres, including vehicle logistical arrangements.5th Mar 1929Box 15 \ 5  Scan073
And comparing different gearbox designs, focusing on 3rd speed, silence, and ease of gear change.5th Mar 1929Box 15 \ 5  Scan074
Page 2 of a memo discussing American schemes and the performance of an SS vehicle after 14,000 miles.13th Mar 1929Box 15 \ 5  Scan075
From D.A. to R. regarding the progress and delays on change gear schemes, including the free wheel and epicyclic gear box.13th Mar 1929Box 15 \ 5  Scan076
Different types of change-speed gearboxes, categorized by their primary benefits such as ease of changing and silence.25th Mar 1929Box 15 \ 5  Scan077
Comparative analysis of different gearbox and coupling schemes, page 2.25th Mar 1929Box 15 \ 5  Scan078
Analysis of gearbox designs, focusing on the advantages and disadvantages of internal mesh with dog clutches.25th Mar 1929Box 15 \ 5  Scan079
Gearbox operation, discussing difficulties with specific types and a proposal for an epicyclic gear system.3rd Apr 1929Box 15 \ 5  Scan080
Modifications to a 3rd-speed easy-change gearbox, including diagrams.3rd Apr 1929Box 15 \ 5  Scan081
Typed memorandum with a small sketch discussing the assembly and testing of a freewheel mechanism.14th Apr 1929Box 15 \ 5  Scan082
Proposal for an easy change gearbox device using suction to operate a clutch, potentially for a provisional patent.14th Apr 1929Box 15 \ 5  Scan083
Improvements to the S.S. gearbox by modifying gear tooth chamfer angles.1st May 1929Box 15 \ 5  Scan084
The optimal gearbox oil height from a 10,000-mile test and instructing dipsticks to be marked.25th May 1939Box 15 \ 5  Scan085
Recommendation for S.S. and India 1V speedometer cable revolutions per mile standards.4th Jul 1929Box 15 \ 5  Scan086
Urgent memo detailing a decision to produce the last 70 'O' Series chassis with a larger bore engine and improved gears.24th Jun 1929Box 15 \ 5  Scan087
Gearbox problems and potential solutions for a more silent and easily changed gear.3rd Jun 1929Box 15 \ 5  Scan088
The Salerni coupling, its disadvantages, and proposed modifications to improve its function with the clutch and gear change mechanism.3rd Jun 1929Box 15 \ 5  Scan089
Potential gearbox improvements using helical gears, a jaw clutch, and the Salerni coupling.8th Jun 1929Box 15 \ 5  Scan090
Correction to scheme 2899, regarding the method for retaining a large ball bearing for an experimental Salerni coupling gearbox.8th Jun 1929Box 15 \ 5  Scan091
Scheme for a silent 3rd speed gearbox using single and double helical gears.2nd Jun 1929Box 15 \ 5  Scan092
Arranging a meeting at 113 Ladbrook Road to discuss the speedometer on car 18-EX.17th Jul 1929Box 15 \ 5  Scan093
The difficulty of changing '33' gear boxes and a proposed modification to the rear suspension bracket.22th Jul 1929Box 15 \ 5  Scan094
Responding to feedback on the coachwork, speedometer, and steering for car 18-EX.26th Jul 1929Box 15 \ 5  Scan095
Test results for climbing Ticknall Hill in car 10-EX, comparing different driving methods and other vehicles.22th Aug 1929Box 15 \ 5  Scan096
Instructions regarding an Epicyclic Third Speed Gear, its schematic, and fitting to car 14-EX.21th Sep 1929Box 15 \ 5  Scan097
Epicyclic 3rd speed gear, requesting a new clutch spring and alteration of clutch clearance.21th Sep 1929Box 15 \ 5  Scan098
Investigation into the comparative merits and noise levels of spur, epicyclic, and internal gears for a silent 3rd-speed gearbox.24th Dec 1929Box 15 \ 5  Scan099
Requesting modifications to sliding dogs for the 14-EX car silent third speed gearbox.31th Dec 1929Box 15 \ 5  Scan100
Modification drawing for 3 1/2' & 7 1/4' gear dogs, part number G 77976.30th Dec 1914Box 15 \ 5  Scan101
Stamped document page with faint, illegible text.30th Dec 1929Box 15 \ 5  Scan102
Causes and fixes for oil leaks from the No.2-WJ gearbox.13th Jan 1930Box 15 \ 5  Scan103
Development of an improved and silent 4-speed car change speed gear.13th Jan 1930Box 15 \ 5  Scan104


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