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
Letter to Borg & Beck Co. Ltd. regarding the failure of two clutch pressure plates during testing.30th Jun 1939Box 130 \ 3  scan0096
Letter concerning the low tensile strength of iron castings and comparing engine test bed conditions to on-road conditions.30th Jun 1939Box 130 \ 3  scan0097
Instructions for modifying clutch plates to eliminate transmission rattles.30th Jun 1939Box 130 \ 3  scan0098
Letter from Borg & Beck Company Ltd. regarding a special 10 inch driven plate assembly.30th Jun 1939Box 130 \ 3  scan0099
Letter from clutch manufacturer Borg & Beck regarding an investigation into broken pressure plates.3rd Jul 1939Box 130 \ 3  scan0100
Letter from Borg & Beck Company Limited regarding the conclusion of tests and the status of plates on the road.3rd Jul 1939Box 130 \ 3  scan0101
Letter to supplier Borg & Beck Ltd. detailing faults found in a consignment of 10' Long clutches.21th Jul 1939Box 130 \ 3  scan0102
Letter agreeing to a suggestion to send 6 clutches with the adjusting screws unlocked.21th Jul 1939Box 130 \ 3  scan0103
Letter from clutch manufacturer Borg & Beck regarding problems with a recent consignment.24th Jul 1939Box 130 \ 3  scan0104
Thickening of the flexible flywheel friction plate, updating part numbers, and requesting testing.9th Aug 1939Box 130 \ 3  scan0105
Letter from Hubert HP Trist & Company regarding 'Top Dog' B.W. quality clutch facings sent for testing.16th Aug 1939Box 130 \ 3  scan0106
Letter to Hubert HP Trist & Co. regarding a delay in road tests for 'Top Dog' clutch facings.17th Aug 1939Box 130 \ 3  scan0107
Letter to Borg & Beck Co.Ltd. regarding difficulties with a 10' Long Clutch, enclosing a memo for review.18th Aug 1939Box 130 \ 3  scan0108
Issues and resolutions for Bentley V Long 10' clutches with supplier Borg & Beck.1st Sep 1939Box 130 \ 3  scan0109
Clutch balancing issues, including flywheel hole tolerances and cover pressing distortion.17th Aug 1939Box 130 \ 3  scan0110
Letter to Borg & Beck Co. Ltd. regarding dimensions and drawings for 10' and 11' long clutches.19th Aug 1939Box 130 \ 3  scan0111
Letter from Borg & Beck Company Ltd. confirming arrangements discussed during Mr. Chandler's visit.19th Aug 1939Box 130 \ 3  scan0112
Letter to Joseph Lucas Ltd. regarding a new type of starting motor clutch received from Delco Products, USA.21th Aug 1939Box 130 \ 3  scan0113
Letter to Messrs. Joseph Lucas Ltd. regarding a Bendix Pinion unit.21th Aug 1939Box 130 \ 3  scan0114
Loaning a starting motor clutch to Messrs. Joseph Lucas.22th Aug 1939Box 130 \ 3  scan0115
Request for a complete list of flywheels fitted to experimental cars and a table of available experimental flywheels.21th Dec 1939Box 130 \ 3  scan0116
Seeking advice on stuck clutches in cars stored for the duration of the War.24th Jan 1940Box 130 \ 3  scan0117
Susceptibility of clutches with Thermoid linings to sticking on stored car models.25th Jan 1940Box 130 \ 3  scan0118
Clutches on stored cars, specifically regarding thermoid clutch linings and the 'jacking-out' process.29th Jan 1940Box 130 \ 3  scan0119
Request for the scheme for a simplified flexible flywheel.13th Feb 1940Box 130 \ 3  scan0120
Design and tabulation of flywheels for 6-cylinder engines.23th Feb 1940Box 130 \ 3  scan0121
Data sheet comparing flywheel specifications for B.60 and B.80 C.I. engines with Lucas starter motors.23th Feb 1940Box 130 \ 3  scan0122
Data table comparing flywheel and clutch specifications for various engine configurations.28th Feb 1940Box 130 \ 3  scan0123
Flywheel inertia calculations and design suggestions.28th Feb 1940Box 130 \ 3  scan0124
Calculations comparing two design variants (Fig A and Fig B) of a mechanical component, including dimensions, inertia, and weight.28th Feb 1940Box 130 \ 3  scan0125
The requirement for high inertia fly-wheels to ensure tractability on small range cars.29th Feb 1940Box 130 \ 3  scan0126
Modifications to the light flywheel for the B.60 engine and confirming usage of the heavy type flywheel on certain cars.6th Mar 1940Box 130 \ 3  scan0127
Outlining new prints and parts for the R.H. Senior Range B.60 Ripplet flywheel and clutch assembly.18th Mar 1940Box 130 \ 3  scan0128
New parts for the flywheel, clutch, and clutch casing of the Left Hand Silver Phantom.18th Mar 1940Box 130 \ 3  scan0129
Alteration note cancelling document RG 582 for the Flywheel & Clutch and replacing it with RG 697 due to a Drawing Office error.27th Mar 1940Box 130 \ 3  scan0130
Two flywheel alterations (RG 478 and RG 567) due to drawing office errors.9th Apr 1940Box 130 \ 3  scan0131
Blueprints for the Ripplet Chassis Flywheel and Clutch, replacing a previous list of parts.9th Apr 1940Box 130 \ 3  scan0132
Investigating the cause of clutch thrust failure on a semi-centrifugal clutch.22th Jul 1940Box 130 \ 3  scan0133
Specification table for identifying Long Clutches for various engines.9th Nov 1940Box 130 \ 3  scan0134
Thoughts on clutch throwout bearings and the elimination of cages.9th Nov 1940Box 130 \ 3  scan0135
Request to Borg & Beck Co.Ltd. for a high-torque clutch for an experimental heavy lorry application.12th Nov 1940Box 130 \ 3  scan0136
Tank engine clutch specifications and recommendations from Ferodo and Borg & Beck.2nd Dec 1940Box 130 \ 3  scan0137
Technical assessment of various clutch options from Borg & Beck, detailing their torque and speed limitations.2nd Dec 1940Box 130 \ 3  scan0138
Analysis of different clutch sizes, unit pressures, and spring loads, with comparisons to Borg & Beck specifications.2nd Dec 1940Box 130 \ 3  scan0139
Analysis and specifications for an 18-inch single disc clutch, including spring calculations and torque data.2nd Dec 1940Box 130 \ 3  scan0140
Report to Borg & Beck, Ltd. regarding periodic lever flutter on a 10' C.P. clutch.3rd Dec 1940Box 130 \ 3  scan0141
Technical letter discussing clutch movement ratios and stiffness.3rd Dec 1940Box 130 \ 3  scan0142
Letter to Vandervell Products Ltd. regarding the supply and modification of a large clutch disc for experimental purposes.5th Dec 1940Box 130 \ 3  scan0143
Letter to Vandervell Products Ltd. concerning the experimental use and modification of a large clutch disc.5th Dec 1940Box 130 \ 3  scan0144
Letter to Vandervell Products Ltd. regarding the material choice for bearings.30th Nov 1940Box 130 \ 3  scan0145
Confidential letter to Messrs. Borg & Beck, Ltd. regarding the design and dimensional constraints of a 16' twin disc clutch for a tank project.20th Dec 1940Box 130 \ 3  scan0146
Testing the effect of a clutch disc on transmission rattle for Chassis No. B.22.AW.30th Dec 1940Box 130 \ 3  scan0147
Letter to Borg & Beck Ltd. regarding an investigation into lever flutter on a 10 C.F. clutch, detailing compression and stiffness test results.31th Dec 1940Box 130 \ 3  scan0148
Letter discussing the deflection and load characteristics of a stiffened clutch cover assembly.1st Dec 1940Box 130 \ 3  scan0149
Graph showing the results of a compression test on a 10 C.F. clutch disc.30th Dec 1940Box 130 \ 3  scan0150
Graph comparing deflection tests between a standard and stiffened clutch cover pressing.30th Dec 1940Box 130 \ 3  scan0151
Design for stiffening ribs for a clutch cover plate.31th Dec 1940Box 130 \ 3  scan0152
Graph illustrating the pressure plate loading against RPM for a 10 CF clutch.30th Dec 1940Box 130 \ 3  scan0153
Letter from Borg & Beck discussing a lever flutter issue on the 10 CF Clutch and suggesting modifications.11th Dec 1940Box 130 \ 3  scan0154
The redesign of the senior range connecting rod following engine testing.17th Dec 1940Box 130 \ 3  scan0155
Letter from Borg & Beck regarding experiments on a 10.C.F. Clutch to trace the reason for lever flutter.8th Jan 1941Box 130 \ 3  scan0156
Responding to questions about the construction and longevity of the Borg & Beck clutch centre damping.16th Jan 1941Box 130 \ 3  scan0157
Modifications to maintain damping by altering the contact between a disc and hub flange, and increasing torsional spring diameter.16th Jan 1941Box 130 \ 3  scan0158
Examining the construction and damping capabilities of a Borg & Beck clutch centre.16th Jan 1941Box 130 \ 3  scan0159
Modifications for a damping mechanism, including increasing torsional spring diameter.16th Jan 1941Box 130 \ 3  scan0160
Cross-sectional diagram detailing the construction of a Borg & Beck clutch disc.15th Nov 1941Box 130 \ 3  scan0161
Development of a clutch centre damping product with Borg & Beck's.22th Jan 1941Box 130 \ 3  scan0162
Clutch disc friction testing and its relation to transmission rattle on chassis B.20.AW.24th Jan 1941Box 130 \ 3  scan0163
Visit to Borg & Beck discussing friction issues and design changes for 10-inch clutch discs.31th Jan 1941Box 130 \ 3  scan0164
Clutch issues, discussing torsion springs, friction tests, and interactions with supplier Borg & Beck.31th Jan 1941Box 130 \ 3  scan0165
Visit to Borg & Beck regarding various clutch designs and issues with friction discs.31th Jan 1941Box 130 \ 3  scan0166
Clutch disc issues, comparing testing methods and attitudes with supplier Borg & Beck.31th Jan 1941Box 130 \ 3  scan0167
Diagram illustrating friction and spring in plates related to a hub flange.31th Jan 1941Box 130 \ 3  scan0168
Friction check on a 10' clutch disc and its relation to transmission rattle.24th Jan 1941Box 130 \ 3  scan0169
Graph plotting torque against degrees of deflection from a torsional test on a 10 inch clutch for chassis B20AW.22th Jan 1941Box 130 \ 3  scan0170
On design improvements for selector lever locking plates and clutch housing clearance.4th Feb 1941Box 130 \ 3  scan0171
Letter to Borg & Beck Ltd. concerning a visit and discussions on a 16' twin-plate clutch design.5th Feb 1941Box 130 \ 3  scan0172
Meeting notes from a visit to Borg & Beck concerning various clutch disc designs and modifications.29th Jan 1931Box 130 \ 3  scan0173
Letter to Borg & Beck Co., Ltd. concerning tank and car clutches.5th Feb 1941Box 130 \ 3  scan0174
Letter from Borg & Beck Company Ltd. regarding the design and specifications of tank clutches.15th Feb 1941Box 130 \ 3  scan0175
Letter from Borg & Beck Company Limited concerning the supply and testing of 10' Bentley driven plate clutch sample assemblies.15th Feb 1941Box 130 \ 3  scan0176
Letter from Borg & Beck detailing specifications for four experimental 10' driven plate clutch assemblies for a Bentley application.19th Feb 1941Box 130 \ 3  scan0177
Letter from Borg & Beck Company Ltd. regarding test curves and anticipating comments.18th May 1938Box 130 \ 3  scan0178
Graph showing deflection versus torque for a modified 10 inch drive plate with yellow springs.18th Feb 1941Box 130 \ 3  scan0179
Graph plotting torque against deflection for a 10 inch drive plate modified with stop pins and spacers.19th Feb 1941Box 130 \ 3  scan0180
Graph plotting torque against deflection for a modified 'Plate B' drive plate assembly.17th Feb 1941Box 130 \ 3  scan0181
Graph plotting deflection against torque for a 10 inch drive plate modified with stop pins.11th Feb 1941Box 130 \ 3  scan0182
The testing of sample 10' clutch discs from Borg & Beck with variations in stop pin length and spacer arrangement.7th Mar 1941Box 130 \ 3  scan0183
Comparison of Borg & Beck friction disc test results with in-house results after unit conversion.7th Mar 1941Box 130 \ 3  scan0184
Payment for an invoice for 4 Borg & Beck 10' drive plate assemblies.17th Mar 1941Box 130 \ 3  scan0185
Analysis of sample 10' clutch discs from Borg & Beck, detailing variations in stop pin length and spacer arrangement.7th Mar 1941Box 130 \ 3  scan0186
Comparison of friction disc test results, converting Borg & Beck units to internal units.7th Mar 1941Box 130 \ 3  scan0187
Graph showing the results of a torsional deflection test on a 10-inch clutch disc.4th Mar 1941Box 130 \ 3  scan0188
Chart showing the results of a torsional deflection test on a 10-inch clutch disc.5th Mar 1941Box 130 \ 3  scan0189
Graph showing the results of a torsional deflection test on a 10-inch clutch disc, designated Disc C.5th Mar 1941Box 130 \ 3  scan0190
Graph plotting torque against deflection for a torsional deflection test on a 10 inch clutch disc.5th Aug 1941Box 130 \ 3  scan0191
Letter from a clutch manufacturer regarding a clutch flutter investigation for a Bentley application.15th May 1941Box 130 \ 3  scan0192
Letter from Borg & Beck Company Ltd regarding a 10 C.F. Clutch investigation.22th May 1941Box 130 \ 3  scan0193
Visit to Borg & Beck to discuss a complaint about clutch pedal lift with reference to a reply from the Long Co.24th May 1941Box 130 \ 3  scan0194
Clutch performance, supplier feedback from Long Company and Borg & Beck, and potential design improvements.24th May 1941Box 130 \ 3  scan0195


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