| Description | Date | Identifier | |
| To fit circular woven fabric with extra rivets to the clutch on car 20-EX. | 18th Sep 1930 | Box 13 \ 7 07-page072 | |
| Results of tests conducted on two types of Phantom clutches on a test bed. | 19th Sep 1930 | Box 13 \ 7 07-page073 | |
| Severe slipping test performed on a Phantom driven plate clutch. | 25th Sep 1930 | Box 13 \ 7 07-page074 | |
| Page 2 of a memo discussing the condition of springs and a clutch. | 26th Sep 1930 | Box 13 \ 7 07-page075 | |
| Failures and testing of experimental Phantom clutches for Rolls-Royce of America. | 26th Sep 1930 | Box 13 \ 7 07-page076 | |
| Clutch testing, comparing a new material against the standard, and proposing modifications for production cars. | 26th Sep 1930 | Box 13 \ 7 07-page077 | |
| Experimental modification to the Phantom clutch plate to reduce weight. | 23th Sep 1930 | Box 13 \ 7 07-page078 | |
| Amount and type of oil required for the Phantom clutch ball race and universal joint. | 29th Sep 1930 | Box 13 \ 7 07-page079 | |
| Investigation into flywheel vibrations, ruling out crankshaft torsional period and testing various solutions. | 3rd Oct 1930 | Box 13 \ 7 07-page080 | |
| Supply request and specifications for a clutch stop spring for EAC.7. | 6th Nov 1930 | Box 13 \ 7 07-page081 | |
| Instruction to amend the working clearance for the clutch trunnion sleeve on 25 HP and Phantom II models following a seizure. | 22th Nov 1930 | Box 13 \ 7 07-page082 | |
| Torsional vibrations in a slipper wheel's steel disc and related engine performance issues. | 1st Feb 1931 | Box 13 \ 7 07-page083 | |
| Technical memorandum discussing flywheel vibrations, inertia, and crankshaft design modifications. | 6th Feb 1931 | Box 13 \ 7 07-page084 | |
| Engine vibration, balance weights, and potential improvements by using thicker webs and larger pins. | 6th Feb 1931 | Box 13 \ 7 07-page085 | |
| 12-cylinder engine design, crankshaft types, and vehicle vibration issues. | 10th Feb 1931 | Box 13 \ 7 07-page086 | |
| Proposal to increase the thickness of the crankshaft flange and flywheel web for improved stiffness. | 10th Feb 1931 | Box 13 \ 7 07-page087 | |
| Nature, cause, and testing methods for a vibration issue in a Phantom car engine. | 20th Feb 1931 | Box 13 \ 7 07-page088 | |
| Flywheel whirl, crankchamber stiffness, and engine periodicity issues. | 23th Feb 1931 | Box 13 \ 7 07-page089 | |
| Lighter and stiffer flywheel modifications for Phantom experiments. | 23th Feb 1931 | Box 13 \ 7 07-page090 | |
| Design of a lighter and stiffer flywheel, including material changes and bolt configuration. | 27th Mar 1931 | Box 13 \ 7 07-page091 | |
| Investigations into engine booms on the Phantom II model, including tests with a stiffer flywheel. | 2nd Mar 1931 | Box 13 \ 7 07-page092 | |
| Blueprint drawing of a 40/50 crankshaft stiff flange. | 2nd Mar 1931 | Box 13 \ 7 07-page093 | |
| Blueprint for a stiffened flywheel. | 10th Mar 1931 | Box 13 \ 7 07-page094 | |
| Instruction to modify and test a flywheel by increasing the number of securing bolts from 6 to 9. | 10th Mar 1931 | Box 13 \ 7 07-page095 | |
| Tests conducted to investigate the cause of a 'boom' or vibration in the Phantom II model. | 11th Mar 1931 | Box 13 \ 7 07-page096 | |
| Investigation into a 'boom' complaint, comparing Phantom I and Phantom II models and testing potential solutions. | 11th Mar 1931 | Box 13 \ 7 07-page097 | |
| Experimental arrangement for a bearing behind the flywheel. | 23th Apr 1931 | Box 13 \ 7 07-page098 | |
| Issue of sticking cones in a synchro-mesh gearbox, referencing Buick's lapping process. | 19th Sep 1931 | Box 13 \ 7 07-page099 | |
| Inner sleeve alignment and the use of a bronze stirrup to reduce gear friction. | 26th Sep 1931 | Box 13 \ 7 07-page100 | |
| Success of a new synchromesh gearbox with a silent 3rd gear. | 26th Sep 1931 | Box 13 \ 7 07-page101 | |
| Adoption of a synchro mesh gearbox and proposing a new design using epicyclic units. | 28th Oct 1931 | Box 13 \ 7 07-page102 | |
| Proposed scheme for gearbox improvements, including synchronised brakes and epicyclic units. | 21th Oct 1931 | Box 13 \ 7 07-page103 | |
| Development and implementation of an easy change gearbox with synchromesh for various car models. | 21th Oct 1931 | Box 13 \ 7 07-page104 | |
| Development of synchromesh and epicyclic gear units for the P.2. model. | 22th Oct 1931 | Box 13 \ 7 07-page105 | |
| Urgency of scaling up the 20/25 gearbox to suit the Phantom II Easy and Silent Change. | 23th Oct 1931 | Box 13 \ 7 07-page106 | |
| Design and testing of a P.2 synchro mesh gearbox, comparing it to the 25HP model. | 26th Oct 1931 | Box 13 \ 7 07-page107 | |
| Requesting the manufacture of a thin flange flywheel for a Phantom 11 test vehicle. | 29th Oct 1931 | Box 13 \ 7 07-page108 | |
| Requesting the removal of overhanging bosses on the sliding pinions for the Phantom II gearbox. | 2nd Nov 1931 | Box 13 \ 7 07-page109 | |
| Blueprint of a modified component cross-section, detailing the removal of two bosses. | 12th Nov 1931 | Box 13 \ 7 07-page110 | |
| Test on the Phantom II synchro-mesh gearbox with a heavier clutch member. | 12th Nov 1931 | Box 13 \ 7 07-page111 | |
| Difficulties with clutch stops on synchro-mesh gearboxes and the need for a brake. | 11th Nov 1931 | Box 13 \ 7 07-page112 | |
| Postponement of the automatic clutch spigot lubrication on the 40/50 model due to oil leaks. | 3rd Dec 1931 | Box 13 \ 7 07-page113 | |
| Instruction to abandon automatic clutch spigot lubrication for 20/25 HP and 40/50 HP models. | 4th Dec 1931 | Box 13 \ 7 07-page114 | |
| Test report on a PII synchromesh gearbox with modified 1st and 2nd gears. | 7th Dec 1931 | Box 13 \ 7 07-page115 | |
| Blueprint showing a cross-section of a component with dimensions and modification notes. | 7th Dec 1931 | Box 13 \ 7 07-page116 | |
| Comparison of 40/50 clutch spring specifications relative to 25 HP clutch slipping. | 6th Jan 1932 | Box 13 \ 7 07-page117 | |
| The cause and proposed solution for a clutch pedal rattle on the Phantom II. | 17th Feb 1932 | Box 13 \ 7 07-page118 | |
| Implementation of synchromesh and clutch brakes in 20/25 and 40/50 gearboxes. | 6th May 1932 | Box 13 \ 7 07-page119 | |
| Necessity and application of a clutch brake with the introduction of synchromesh gearboxes. | 7th May 1932 | Box 13 \ 7 07-page120 | |
| Addition of a clutch brake to synchro-mesh gearboxes. | 11th May 1932 | Box 13 \ 7 07-page121 | |
| Trial results and implications of implementing a synchromesh and clutch brake system. | 20th May 1932 | Box 13 \ 7 07-page122 | |
| Decision to not fit a clutch brake on the Phantom II with the synchromesh gearbox, while retaining the housing features for future refitting. | 23th May 1932 | Box 13 \ 7 07-page123 | |
| Request to manufacture three sets of Phantom II clutch springs following a failure on car 19-EX. | 17th Jun 1932 | Box 13 \ 7 07-page124 | |
| Specifications for a Phantom II clutch spring. | 17th Jun 1932 | Box 13 \ 7 07-page125 | |
| Abnormal clutch fabric wear on the 40/50 model during testing in France. | 20th Jun 1932 | Box 13 \ 7 07-page126 | |
| Clutch friction coefficients, proposing a test for losses, and comparing Phantom and 25HP models. | 21th Jun 1932 | Box 13 \ 7 07-page127 | |
| Request to manufacture washers of specific thicknesses for Phantom II clutch tests. | 23th Jun 1932 | Box 13 \ 7 07-page128 | |
| Requesting a report on a received P. 2 clutch disc to understand the conditions that caused its state. | 5th Jul 1932 | Box 13 \ 7 07-page129 | |
| Potential improvements and issues with clutch designs, including pressure plates and friction materials. | 5th Jul 1932 | Box 13 \ 7 07-page130 | |
| Impact of synchromesh gearboxes on clutches and proposed pedal modifications. | 6th Jul 1932 | Box 13 \ 7 07-page131 | |
| Technical memorandum discussing clutch pedal pressures on the Phantom II and 25HP models. | 5th Jul 1932 | Box 13 \ 7 07-page132 | |
| Analysis of clutch separation, torque transmission, and slipping issues across various models. | 9th Jul 1932 | Box 13 \ 7 07-page133 | |
| Reducing clutch slip and declutching effort, comparing clutch designs from competing manufacturers. | 1st Jul 1932 | Box 13 \ 7 07-page134 | |
| Proposed increase in clutch spring force for the 25HP and Phantom II models. | 7th Jul 1932 | Box 13 \ 7 07-page135 | |
| Request for a sketch of the alterations required on the flywheel and ferrules for a Phantom II clutch on vehicle 58-GN. | 6th Sep 1932 | Box 13 \ 7 07-page136 | |
| Modifications required for the 58GN clutch to accommodate stiffened clutch fingers. | 7th Sep 1932 | Box 13 \ 7 07-page137 | |
| Modifications to address excessive clutch wear on the 13-MX car. | 7th Sep 1932 | Box 13 \ 7 07-page138 | |
| Modifications to the flywheel and ferrules for the 40/50 Phantom II model. | 10th Sep 1932 | Box 13 \ 7 07-page139 | |
| Diagram showing modifications to a PII clutch required for stiffened clutch fingers. | 26th Sep 1932 | Box 13 \ 7 07-page140 | |
| Fouling issue with the Autoklean filter on the 20-EX clutch. | 26th Sep 1932 | Box 13 \ 7 07-page141 | |
| The continued failure of the Phantom clutch friction plate despite modifications. | 27th Sep 1932 | Box 13 \ 7 07-page142 | |
| Drawing of a friction plate for a 9ex clutch, detailing modifications and dimensions. | 27th Sep 1934 | Box 13 \ 7 07-page143 | |
| The fitting of stronger clutch springs to synchromesh cars. | 29th Sep 1932 | Box 13 \ 7 07-page144 | |
| Suggestions for converting the P.2. clutch on the 19-EX model. | 30th Sep 1932 | Box 13 \ 7 07-page145 | |
| Issues and design improvements for single-plate clutches, specifically regarding heat management and material choices. | 11th Oct 1932 | Box 13 \ 7 07-page146 | |
| Testing modified clutches and patenting an improved actuating mechanism to fix known faults. | 10th Apr 1932 | Box 13 \ 7 07-page147 | |
| Modifications to the clutch pedal, holder, lever and footboard for the Phantom II Chassis. | 13th Oct 1932 | Box 13 \ 7 07-page148 | |
| Trial of a new damped flexible drive for the clutch. | 2nd Feb 1933 | Box 13 \ 7 07-page149 | |
| Standardisation of various clutch components including springs, pedal, fingers, and operating lever. | 6th Sep 1932 | Box 13 \ 7 07-page150 | |
| Modifications to the clutch for an 8 Litre Phantom, including lightening the operation and fitting needle rollers. | 21th Feb 1933 | Box 13 \ 7 07-page151 | |
| Drawing of a needle bearing clutch operation mechanism, part II. | 21th Feb 1939 | Box 13 \ 7 07-page152 | |
| Relative importance of friction losses in clutch operation. | 9th Mar 1935 | Box 13 \ 7 07-page153 | |
| Insufficient separation in the Phantom II clutch and suggesting a reduction in tolerances for production. | 9th Mar 1933 | Box 13 \ 7 07-page154 | |
| Suggested modifications to the P.2. clutch for the 10,000 mile car. | 28th Dec 1933 | Box 13 \ 7 07-page155 | |
| The necessity of an external clutch adjustment for the Phantom model, referencing owner complaints. | 1st Jan 1934 | Box 13 \ 7 07-page156 | |
| Clutch design, comparing American and English operating conditions and design philosophies. | 24th Feb 1934 | Box 13 \ 7 07-page157 | |
| New clutch adjustment method for future production cars, intended for owner convenience. | 12th Mar 1934 | Box 13 \ 7 07-page158 | |
| Requesting a change of material from steel to Milanite for three flywheels. | 11th Apr 1934 | Box 13 \ 7 07-page159 | |
| Standardisation of parts for an external clutch adjustment and modification to a coupling. | 1st Jun 1934 | Box 13 \ 7 07-page160 | |
| Estimated cost for extra jigs, tools, and equipment for the 'T' series chassis. | 11th May 1934 | Box 13 \ 7 07-page161 | |
| Standardisation of bifurcated rivetting for clutch linings to reduce cost. | 10th May 1934 | Box 13 \ 7 07-page162 | |
| Cost estimation for introducing new jigs and tools for the 'T' series chassis production. | 16th May 1934 | Box 13 \ 7 07-page163 | |
| Phantom II clutch operation, specifically a ball-ended link and bracket for Terraplane-type engine mountings. | 21th Jul 1934 | Box 13 \ 7 07-page164 | |
| Report seeking an opinion on clutch fierceness in vehicle 28-EX, suspected to be caused by engine movement opening the throttle. | 26th Jul 1934 | Box 13 \ 7 07-page165 | |
| Issue where oil feed to the clutch trunion is blown away at high engine speeds. | 22th Feb 1935 | Box 13 \ 7 07-page166 | |
| Note requesting recommendations for a chassis issue involving the clutch, trunnion and oil feed. | 2nd Mar 1935 | Box 13 \ 7 07-page167 | |
| Proposing modifications to the Phantom II Clutch Trunnion Oil Feed system, including a sketch. | 14th Mar 1935 | Box 13 \ 7 07-page168 | |
| Revisions to the crankshaft and connecting rods for EAC.10 & 14 models. | 25th Nov 1927 | Box 13 \ 8 08-page1 | |
| Proposal for an adjustable, spring-loaded ball joint for the front axle control connecting rod to correct lean. | 21th Jun 1928 | Box 13 \ 8 08-page2 | |
| Modifications recommended by the Experimental Department for the 'SS' Chassis, specifically for the connecting rods and crankshaft. | 9th Nov 1928 | Box 13 \ 8 08-page3 | |
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