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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DescriptionDateIdentifier
Page discussing crankshaft stiffness, inertia, and the free period of vibration.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  39
Technical comparison of crankshaft inertia and stiffness between a 20 HP engine, a Lorraine-Dietrich engine, and a Goshawk engine.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  40
Technical comparison of crankshaft inertia and stiffness, referencing the 20 HP, Lorraine, and Phantom engines.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  41
Analysis of engine crankshaft stiffness, inertia, 'master period' vibration, and a summary of damper types.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  42
Engine damper application, crankshaft stiffness, and inertia management for high-speed engines.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  43
Damper types, crankshaft stiffness, and vibration analysis for a 20 HP engine.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  44
Explanation of harmonic vibrations and their effect on a six-cylinder in-line engine crankshaft.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  45
Calculation of crankshaft frequency, harmonics, and resulting vibration speeds.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  46
Calculation of the natural frequency and synchronous speed of a Lorraine Dietrich crankshaft.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  47
Diagram showing the amplitude of torsional vibrations due to harmonics of gas pressure torque at full throttle for a Standard 20 engine without a damper.10th Apr 1927West Wittering \ Q \ 2April1927-June1927  48
Largely blank document with a purple date stamp in the bottom right corner.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  49
Battery ignition systems, specifically regarding the performance of different contact breaker lever springs.25th Apr 1927West Wittering \ Q \ 2April1927-June1927  50
The performance and wear of platinum and tungsten ignition points during a 10,000-mile test.25th Apr 1927West Wittering \ Q \ 2April1927-June1927  51
The unsatisfactory performance of stronger springs on the battery ignition contact breaker lever during a bench test.25th Apr 1927West Wittering \ Q \ 2April1927-June1927  52
Latest developments and increased connection points for a central lubrication system.25th Apr 1927West Wittering \ Q \ 2April1927-June1927  53
Copy of a letter regarding the Bijur Lubrication system and several improvements.14th Apr 1927West Wittering \ Q \ 2April1927-June1927  54
Page discussing improvements and alternatives for a chassis lubrication system, including flow rate data.14th Apr 1927West Wittering \ Q \ 2April1927-June1927  55
Lubrication systems for front ball joints, sphere, torque tube, and road springs, referencing the Bijur system.14th Apr 1927West Wittering \ Q \ 2April1927-June1927  56
Report page discussing the performance of the Bijur lubrication system and a new design for the front shock absorber.26th Apr 1927West Wittering \ Q \ 2April1927-June1927  57
Summary of experimental work and design proposals for chassis improvements on the 40/50 HP model.26th Apr 1927West Wittering \ Q \ 2April1927-June1927  58
Report page discussing potential improvements for brakes, steering, and the petrol supply system.26th Apr 1927West Wittering \ Q \ 2April1927-June1927  59
Potential improvements to chassis lubrication, springs, height, and weight reduction.26th Apr 1927West Wittering \ Q \ 2April1927-June1927  60
The issues and potential improvements for the 20 HP car model.26th Apr 1927West Wittering \ Q \ 2April1927-June1927  61
Experiment to reduce dynamo noise by modifying the armature from 29 to 28 slots.26th Apr 1927West Wittering \ Q \ 2April1927-June1927  62
Production of three experimental armatures for 40/50 HP machines.26th Apr 1927West Wittering \ Q \ 2April1927-June1927  63
Rectifying unit for high voltage D.C. insulation testing.29th Apr 1927West Wittering \ Q \ 2April1927-June1927  64
Page 2 of a document describing the operation of a high voltage insulation testing unit using a valve, trembler coil, and condensers.29th Apr 1927West Wittering \ Q \ 2April1927-June1927  65
Page detailing the use and functionality of an apparatus for testing high-tension insulation resistance.12th Sep 1926West Wittering \ Q \ 2April1927-June1927  66
The development of apparatus for insulation tests on redmanol coil cases.12th Sep 1926West Wittering \ Q \ 2April1927-June1927  67
Circuit diagram for a High Tension Rectifying Unit for High Tension Direct Current insulation tests.29th Apr 1927West Wittering \ Q \ 2April1927-June1927  68
Blank document page with a purple ink stamp from the Print Room.29th Apr 1927West Wittering \ Q \ 2April1927-June1927  69
Circuit diagram for high tension direct current insulation testing using a trembler coil and rectifying valve.29th Apr 1927West Wittering \ Q \ 2April1927-June1927  70
Mostly blank document with an illegible text body and a Print Room stamp.29th Apr 1927West Wittering \ Q \ 2April1927-June1927  71
Proposed specification for testing Redmanol coil cases at temperatures up to 100°C.4th May 1927West Wittering \ Q \ 2April1927-June1927  72
Test procedures and results for condensers and coils, including resistance measurements, leakage current, and spark gap calibration.4th May 1927West Wittering \ Q \ 2April1927-June1927  73
Continuation page of a test report showing tabulated results for various cases.13th Apr 1927West Wittering \ Q \ 2April1927-June1927  74
Development of a production test for Redmanol ignition coil cases.13th Apr 1927West Wittering \ Q \ 2April1927-June1927  75
Test results and conclusions for coil case resistance measurements at various temperatures.6th May 1927West Wittering \ Q \ 2April1927-June1927  76
On the standardisation of sheet metal wing stays and delays with coachbuilders regarding their curvature.6th May 1927West Wittering \ Q \ 2April1927-June1927  77
The bumping and road tests of the 40/50 HP front axle control, discussing braking performance and suggesting changes.1st May 1927West Wittering \ Q \ 2April1927-June1927  78
Analysis of arranging rear hydraulic dampers for torque control and the results of a bench test on the torque arm's influence on spring rating.30th Mar 1927West Wittering \ Q \ 2April1927-June1927  79
Steering improvements for the 40/50 HP model, comparing road reaction and performance with other steering systems.6th May 1927West Wittering \ Q \ 2April1927-June1927  80
Steering issues related to worm and nut components and high-speed wobbles.6th May 1927West Wittering \ Q \ 2April1927-June1927  81
Ground clearance measurements for a 20 HP car fitted with smaller wheels.6th May 1927West Wittering \ Q \ 2April1927-June1927  82
Wheel and tyre sizes, detailing issues from a recent run and plans to test new wheels.6th May 1927West Wittering \ Q \ 2April1927-June1927  83
10,000-mile test of Tungsten battery ignition points on chassis 10-G3 in France.6th May 1927West Wittering \ Q \ 2April1927-June1927  84
Report discussing the performance and potential standardization of tungsten ignition contact points compared to platinum.6th May 1927West Wittering \ Q \ 2April1927-June1927  85
The operational challenges and considerations of using tungsten points in distributors.1st May 1927West Wittering \ Q \ 2April1927-June1927  86
Ignition advance curves and controls for an aluminium engine with a turbulent head.1st May 1927West Wittering \ Q \ 2April1927-June1927  87
Blueprint graph comparing present and proposed ignition advance curves against engine RPM for the Lighter Phantom to LEC 2230.6th May 1927West Wittering \ Q \ 2April1927-June1927  88
Stamped document from the Print Room in Derby.6th May 1927West Wittering \ Q \ 2April1927-June1927  89
20 HP battery ignition fault on chassis 10-G-111, which was traced to water on the plugs.6th May 1927West Wittering \ Q \ 2April1927-June1927  90
Preliminary issues with a sequence starter motor's armature engagement.7th May 1927West Wittering \ Q \ 2April1927-June1927  91
Oil consumption experiments on a Phantom test bench engine comparing different oil drain hole designs.1st May 1927West Wittering \ Q \ 2April1927-June1927  92
The performance and mileage testing of the N.B. type 40/50 dynamo on experimental cars.9th May 1927West Wittering \ Q \ 2April1927-June1927  93
Recommendation for the re-arrangement and standardisation of a machine and its brushes.9th May 1927West Wittering \ Q \ 2April1927-June1927  94
Trial arrangement of a No.2 scheme sequence starter, comparing its advantages over the No.1 scheme.10th May 1927West Wittering \ Q \ 2April1927-June1927  95
Continued report on testing the engagement of a motor pinion with the flywheel, detailing faults found during bench and chassis trials.10th May 1927West Wittering \ Q \ 2April1927-June1927  96
Technical analysis of a motor's design, focusing on magnetic flux, torque, and a comparison with a post-war Bosch motor unit.10th May 1927West Wittering \ Q \ 2April1927-June1927  97
Comparative analysis of a Bosch motor's electrical and mechanical characteristics.10th May 1927West Wittering \ Q \ 2April1927-June1927  98
Experiments to modify a motor's teaser winding to improve armature engagement.10th May 1927West Wittering \ Q \ 2April1927-June1927  99
Trials to suppress armature rotation and a comparison between an RR motor and a Bosch motor.16th May 1927West Wittering \ Q \ 2April1927-June1927  100
The impracticality of adopting 57 grooves in a car dynamo armature.16th May 1927West Wittering \ Q \ 2April1927-June1927  101
Inspecting a faulty Bosch ignition coil and requesting the return of an outdated Lucas magneto.17th May 1927West Wittering \ Q \ 2April1927-June1927  102
The failure of magnesium pedestal pistons after 1000 miles and the resulting design considerations.18th May 1927West Wittering \ Q \ 2April1927-June1927  103
Investigation into inertia and temperature stresses on pedestal type pistons.18th May 1927West Wittering \ Q \ 2April1927-June1927  104
Alterations and winding arrangements for the Sequence Starter Motor No.2.18th May 1927West Wittering \ Q \ 2April1927-June1927  105
Suggestions for the improvement of operation of platinum or tungsten ignition contact points.18th May 1927West Wittering \ Q \ 2April1927-June1927  106
Continued report on ignition system tests for components like contact breakers, distributors, and rotors.18th May 1927West Wittering \ Q \ 2April1927-June1927  107
Progress report on experiments and tests for various engine components, including cams, coils, and contact points.8th May 1927West Wittering \ Q \ 2April1927-June1927  108
Inspection report on a U.S.A. Bosch Ignition Coil, type TC.30, detailing its construction and the inability to find a cause for its partial failure.19th May 1927West Wittering \ Q \ 2April1927-June1927  109
Modifications to a Lucas ERS magneto and plans for future comparative testing.19th May 1927West Wittering \ Q \ 2April1927-June1927  110
Camshaft experiments for 20 HP engine power development.23th May 1927West Wittering \ Q \ 2April1927-June1927  111
Engine performance comparing a long duration camshaft with a standard camshaft, detailing power curves and B.M.E.P values.31th Mar 1927West Wittering \ Q \ 2April1927-June1927  112
Engine power development, detailing experiments with long duration cams, compression ratios, and induction pipe depression.31th Mar 1927West Wittering \ Q \ 2April1927-June1927  113
Test results and specifications for an engine using long-duration inlet and exhaust cams.31th Mar 1927West Wittering \ Q \ 2April1927-June1927  114
Summary of engine performance improvements achieved through various modifications to camshafts, compression, valves, and carburetors.31th Mar 1927West Wittering \ Q \ 2April1927-June1927  115
Conclusions on 20 HP engine tests and proposals for further crankshaft and camshaft development for the Phantom and Falcon 10 engines.31th Mar 1927West Wittering \ Q \ 2April1927-June1927  116
Performance graph showing the 20HP engine power increase from a long duration valve lift.23th May 1927West Wittering \ Q \ 2April1927-June1927  117
Blank document page with a purple ink date stamp from the Derby office.23th May 1927West Wittering \ Q \ 2April1927-June1927  118
Performance graph showing the power increase for a 20 HP engine due to various modifications.23th May 1927West Wittering \ Q \ 2April1927-June1927  119
Graph showing the 20 HP engine's power increase due to long-duration valve lift, comparing standard and special camshafts.23th May 1927West Wittering \ Q \ 2April1927-June1927  120
Diagram of a 20 HP long duration inlet valve lift, comparing it to the standard camshaft.23th Feb 1927West Wittering \ Q \ 2April1927-June1927  121
Timing diagram for a Long Durnon 20 HP camshaft, with a comparison to standard timing.23th Feb 1927West Wittering \ Q \ 2April1927-June1927  122
The recurring breakage of the 20 HP exhaust pipe and bracket, with a suggested solution based on the Silver Ghost design.23th May 1927West Wittering \ Q \ 2April1927-June1927  123
On the unsatisfactory design of the 20 HP exhaust cutout and controls, citing wear and seizing issues.23th May 1927West Wittering \ Q \ 2April1927-June1927  124
Modifications and performance ratios for the Sequence Starter Motor No. 2 scheme.24th May 1927West Wittering \ Q \ 2April1927-June1927  125
Motor armature diameter and a proposed test using a 20 HP armature.24th May 1927West Wittering \ Q \ 2April1927-June1927  126
The failure and loss of rear brake squeak dampers on a 20HP vehicle.24th May 1927West Wittering \ Q \ 2April1927-June1927  127
Tests conducted on a rear silencer heat shield for Phantom cars to reduce interior overheating.25th May 1927West Wittering \ Q \ 2April1927-June1927  128
Adoption of a heat shield and the continued necessity of asbestos and gas-tight floorboards.31th Mar 1927West Wittering \ Q \ 2April1927-June1927  129
Design, testing, and production recommendation for Phantom rear axle jacking pads.26th May 1927West Wittering \ Q \ 2April1927-June1927  130
Power development test on a 20 HP engine using stronger valve springs and a long duration camshaft.26th May 1927West Wittering \ Q \ 2April1927-June1927  131
Testing Stromberg carburetters for low depression, acceleration, and low speed performance.24th Sep 1927West Wittering \ Q \ 2April1927-June1927  132
Graph showing the Brake Horse Power and Brake Mean Effective Pressure for a modified 201P standard engine.24th Sep 1927West Wittering \ Q \ 2April1927-June1927  133
Mostly blank document page with a purple ink stamp in the bottom right corner.26th May 1927West Wittering \ Q \ 2April1927-June1927  134
Overhaul of calculations for the Sequence Starter Motor No. 2 Scheme.28th May 1927West Wittering \ Q \ 2April1927-June1927  135
Axle control tests concerning the shock damper, a 12' lever, and torque arm design, seeking approval to standardise.31th May 1927West Wittering \ Q \ 2April1927-June1927  136
Performance issues and design considerations for a sequence starter motor following a change in reduction ratio.2nd Jun 1927West Wittering \ Q \ 2April1927-June1927  137
Technical memorandum discussing design modifications for a starter motor, including changes to the armature and winding.2nd Jun 1927West Wittering \ Q \ 2April1927-June1927  138
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