| Description | Date | Identifier | |
| Engine vibration issues caused by the slipper drive on 40/50 and 20 HP chassis, proposing improved surface finishing. | 9th Apr 1923 | Box 74 \ 2 scan0360 | |
| Requesting a print of drawing No. Lec. 1751 for the Goshawk side change gearbox casing. | 25th Aug 1923 | Box 74 \ 2 scan0361 | |
| Drawing for an improved outside lever on a Goshawk clutch operating shaft. | 30th Aug 1923 | Box 74 \ 2 scan0362 | |
| The improved Goshawk 11 clutch operating gear to suit a side change gearbox, referencing drawing No. LeC.1754. | 30th Sep 1923 | Box 74 \ 2 scan0363 | |
| Test report on the performance of sample fibre washers for 20-HP Slipper Drives. | 21th Dec 1923 | Box 74 \ 2 scan0364 | |
| Alternative friction materials for slipper flywheels on 20 HP cars, recommending bakelized linen. | 1st Jan 1924 | Box 74 \ 2 scan0365 | |
| Comparison of the moment of inertia between the E.A.C. and Goshawk clutch plates. | 1st Feb 1924 | Box 74 \ 2 scan0366 | |
| Ongoing complaints of the 20-HP Slipper Drive seizing up, and a proposal to standardize a new washer material. | 1st Feb 1924 | Box 74 \ 2 scan0367 | |
| Standardisation of friction discs for the slipper wheel, replacing fibre with dilecto or bakelized linen. | 21th Jan 1924 | Box 74 \ 2 scan0368 | |
| Secret memorandum discussing potential improvements and alternative designs for the EAC's clutch. | 1st Mar 1924 | Box 74 \ 2 scan0369 | |
| Different methods for making a clutch brake, aiming to be as effective as a Hispano. | 27th Mar 1924 | Box 74 \ 2 scan0370 | |
| Complaints about 20-HP Slipper Drives and the proposal to replace fibre washers with Continental Bakelite discs. | 27th Mar 1924 | Box 74 \ 2 scan0371 | |
| 20-HP clutch failure, discussing continued slipping, damaged fabric material, and a cracked rotor. | 7th May 1924 | Box 74 \ 2 scan0372 | |
| Analysis of clutch plate cracking and failure on the 20 HP model, chassis 48-G-2, due to slipping. | 9th May 1924 | Box 74 \ 2 scan0373 | |
| Clutch problems on a 20-HP car, specifically a twisted driving shaft and a cracked hub for customer Rothermere. | 26th Jun 1924 | Box 74 \ 2 scan0374 | |
| Calculating the moment of inertia and radius of gyration for the Goshawk flywheel and clutch using the 'Bifilar Suspension' method. | 19th Dec 1924 | Box 74 \ 2 scan0375 | |
| Modifications to the slipper drive on the 20 HP chassis to address load issues. | 14th Dec 1925 | Box 74 \ 2 scan0376 | |
| Proposal regarding the fitting of springs to a slipper wheel to maintain its appearance. | 14th Dec 1925 | Box 74 \ 2 scan0377 | |
| Using up existing clutch material for R.R. of America Inc. and despatching hydraulic shock absorbers. | 19th Oct 1926 | Box 74 \ 2 scan0378 | |
| Humphrey Sandburg clutch, a freewheel device, and the company's experience with it. | 17th Jan 1927 | Box 74 \ 2 scan0379 | |
| Faults found on engine couplings during testing and suggesting solutions. | 3rd Dec 1920 | Box 74 \ 3 scan0001 | |
| Responding to concerns about engine coupling faults found during testing. | 22th Dec 1920 | Box 74 \ 3 scan0002 | |
| Complaints and experimental tests regarding chassis coupling clatter. | 22th Feb 1921 | Box 74 \ 3 scan0003 | |
| Complaints of slack in engine couplings occurring after comparatively short mileage. | 9th Nov 1922 | Box 74 \ 3 scan0004 | |
| Standardisation of a spherical ended lock for a 40/50 HP engine coupling. | 24th Sep 1923 | Box 74 \ 3 scan0005 | |
| Standardisation of chassis parts regarding the use of standard nuts on the engine coupling. | 3rd Oct 1923 | Box 74 \ 3 scan0006 | |
| Mack Rubber Block Coupling, attaching a copy of document Oy8-E-102223 and related blueprints. | 22th Oct 1925 | Box 74 \ 3 scan0007 | |
| Letter discussing the specifications and potential applications of the Mack rubber block coupling. | 22th Oct 1925 | Box 74 \ 3 scan0008 | |
| Standardisation document for an engine coupling design improvement. | 8th Oct 1923 | Box 74 \ 3 scan0009 | |
| Approving the suggestion to waterproof a flexible coupling with canvas. | 9th Feb 1924 | Box 74 \ 3 scan0010 | |
| Design of an anti-groan device for existing and 'V' series cars. | 22th Dec 1924 | Box 74 \ 3 scan0011 | |
| 'groans' in the transmission on a standard chassis and the effectiveness of a fabric coupling. | 23th Dec 1924 | Box 74 \ 3 scan0012 | |
| Coupling sleeve for 40/50 cars experiencing groans. | 9th Jan 1925 | Box 74 \ 3 scan0013 | |
| The condition of a dismantled 40/50 HP Spring Engine Coupling from Chassis 2291. | 21th Feb 1925 | Box 74 \ 3 scan0014 | |
| Requesting a car with a known 'transmission groan' to test a fabric coupling for the 40/50 chassis. | 5th Mar 1925 | Box 74 \ 3 scan0015 | |
| Problems and potential solutions for 40/50 and EAC fabric couplings. | 28th Apr 1925 | Box 74 \ 3 scan0016 | |
| Analysis of a fabric coupling's performance under reverse torque and discussion of testing methods. | 29th Apr 1925 | Box 74 \ 3 scan0017 | |
| Proposal to trial Fabric Flexible Couplings from The Hillman Company. | 19th May 1925 | Box 74 \ 3 scan0018 | |
| Quality and potential of new fabric couplings from Hillmans of Dudley. | 12th Jun 1925 | Box 74 \ 3 scan0019 | |
| Requesting the testing of Hillman Fabric Flexible Couplings. | 19th Apr 1926 | Box 74 \ 3 scan0020 | |
| Request for the supply of specific Alpe Couplings with various thicknesses. | 4th Jun 1928 | Box 74 \ 3 scan0021 | |
| Comparison of the performance and condition of American and British fabric engine couplings. | 4th Oct 1928 | Box 74 \ 3 scan0022 | |
| Comparing the relative stiffness and characteristics of bulged and standard Hardy fabric couplings. | 15th Jan 1929 | Box 74 \ 3 scan0023 | |
| Graph comparing the torque vs. angular deflection for Bulged and Standard Hardy fabric couplings. | 15th Jan 1929 | Box 74 \ 3 scan0024 | |
| Graph plotting torque against angular deflection to measure transmission and tyre flexibility. | 15th Jan 1929 | Box 74 \ 3 scan0025 | |
| Graph showing the torque vs. angular deflection characteristics for new and worn Hardy couplings. | 4th Apr 1919 | Box 74 \ 3 scan0026 | |
| Suggesting improvements to the 40/50 chassis magneto drive and engine/gearbox coupling. | 4th Apr 1919 | Box 74 \ 3 scan0027 | |
| Suggestions for the 40/50 HP chassis magneto drive and rear coupling between the engine and gearbox. | 4th Apr 1919 | Box 74 \ 3 scan0028 | |
| Design and material choice for a magneto coupling, comparing leather/fabric with serrated drives. | 11th Apr 1919 | Box 74 \ 3 scan0029 | |
| Introduction of a new fabric magneto coupling. | 14th May 1919 | Box 74 \ 3 scan0030 | |
| The design of an experimental 40/50 HP magneto drive, focusing on the fabric couplings and heat protection. | 31th May 1919 | Box 74 \ 3 scan0031 | |
| Design memo discussing alterations to a castellated drive system, with sketches for the front and rear joints. | 31th May 1919 | Box 74 \ 3 scan0032 | |
| Design points for the 40/50 HP Magneto Drive and Couplings. | 26th Jul 1919 | Box 74 \ 3 scan0033 | |
| Specifications for aluminium covers, fibre washers, magneto drive and fabric coupling drive. | 26th Jul 1919 | Box 74 \ 3 scan0034 | |
| Extract from a report on chassis 49-GB, suggesting solutions for a noisy magneto drive. | 22th Sep 1919 | Box 74 \ 3 scan0035 | |
| List of requested modifications and new parts to be fitted to chassis 2.EX. | 29th Dec 1919 | Box 74 \ 3 scan0036 | |
| Provision for a magneto brake on new magneto drives for the 40/50 chassis. | 3rd Feb 1920 | Box 74 \ 3 scan0037 | |
| Provision of a brake drum on the magneto drive for the 40/50 chassis. | 2nd Feb 1920 | Box 74 \ 3 scan0038 | |
| List of new parts fitted to a car intended for a 10,000-mile run, with associated remarks. | 1st Jan 1920 | Box 74 \ 3 scan0039 | |
| New magneto drive designs for the 40/50 HP chassis, recommending a provision for a brake to solve noise issues. | 9th Feb 1920 | Box 74 \ 3 scan0040 | |
| The 10,000-mile test of the 2EX chassis, detailing the magneto drive, new air pump, and coil. | 9th Apr 1920 | Box 74 \ 3 scan0041 | |
| The magneto drive design, addressing heat from the exhaust pipe and recommending a specific transmission shaft construction. | 19th Apr 1920 | Box 74 \ 3 scan0042 | |
| Extract detailing a list of requested parts and modifications for a car for West Wittering. | 19th Apr 1920 | Box 74 \ 3 scan0043 | |
| Extract discussing the standardisation of parts following a 10,000-mile test on Car 2.EX. | 19th Apr 1920 | Box 74 \ 3 scan0044 | |
| Supply and modification of magneto fabric discs for dynamo drive couplings. | 21th Apr 1920 | Box 74 \ 3 scan0045 | |
| Planned improvements for American-built cars, including thermostat, clutch, magneto, and petrol tank updates. | 15th Feb 1920 | Box 74 \ 3 scan0046 | |
| Design points for the American chassis, specifically the magneto drive and petrol tank. | 27th May 1920 | Box 74 \ 3 scan0047 | |
| Outlining a delay and a list of new parts being fitted to a replacement vehicle, car 6.EX. | 1st May 1920 | Box 74 \ 3 scan0048 | |
| Manufacturing accuracy of a flexible drive for the Magneto with Hardy & Company. | 11th Jun 1920 | Box 74 \ 3 scan0049 | |
| Extract listing experimental parts to be fitted to the 6.EX car at West Wittering. | 28th Jun 1920 | Box 74 \ 3 scan0050 | |
| Raising concerns about the Hardy fabric coupling for the magneto drive on the postwar 'P' Series chassis. | 26th Jul 1920 | Box 74 \ 3 scan0051 | |
| Issues with the fabric coupling type of magneto drive and the move towards a serrated type. | 28th Jul 1920 | Box 74 \ 3 scan0052 | |
| Comparing the performance and advantages of serrated and fabric magneto drives for the 40/50 chassis. | 27th Sep 1920 | Box 74 \ 3 scan0053 | |
| The issues with fabric magneto drives, recommending a switch to a standardized serrated magneto drive. | 27th Sep 1920 | Box 74 \ 3 scan0054 | |
| Testing of an improved serrated magneto drive and the production of 'O' and 'P' series. | 27th Sep 1920 | Box 74 \ 3 scan0055 | |
| Standardisation of serrated magneto drives over the fabric type. | 29th Sep 1920 | Box 74 \ 3 scan0056 | |
| Proposal to replace a fibre washer with a paper washer in the serrated type magneto drive due to charring issues during dynamometer testing. | 9th Sep 1921 | Box 74 \ 3 scan0057 | |
| Covering memo regarding communication from the Self-Sealing Rubber Co. Ltd. about improved flexible coupling discs for cars. | 27th Feb 1924 | Box 74 \ 3 scan0058 | |
| Letter from The Self-Sealing Rubber Co. Ltd. promoting their patented improved flexible coupling discs for cars. | 25th Feb 1924 | Box 74 \ 3 scan0059 | |
| Letter from The Self-Sealing Rubber Co. Ltd. concerning the fitting and protection of patent coupling discs. | 22th Mar 1923 | Box 74 \ 3 scan0060 | |
| Test report from The Self Sealing Rubber Co. Ltd. on the tensile strength of flexible coupling discs. | 22th Mar 1923 | Box 74 \ 3 scan0061 | |
| Waterproofing of a flexible coupling with canvas. | 1st Feb 1924 | Box 74 \ 3 scan0062 | |
| Complaints regarding engine coupling rattles, comparing pre-war and post-war cars. | 9th Aug 1920 | Box 74 \ 3 scan0063 | |
| Letter from Maurice Olley regarding engine coupling discs with conical rubber inserts being sent for testing. | 24th Aug 1927 | Box 74 \ 3 scan0064 | |
| American Standardisation Sheet No. 108 for Engine Coupling. | 20th Sep 1928 | Box 74 \ 3 scan0065 | |
| Ordering, testing, and observed performance of bulged fabric engine couplings. | 26th Nov 1928 | Box 74 \ 3 scan0066 | |
| The effects of a damaged disc, noting fabric breakdown, transmission clatter, and clutch grabbing issues. | 31th Jan 1929 | Box 74 \ 3 scan0067 | |
| Report on the flexibility of a fabric coupling and its potential to cause clatter during declutching. | 31th Jan 1929 | Box 74 \ 3 scan0068 | |
| Chart plotting torque against angular deflection for various transmission coupling discs. | 31th Jan 1929 | Box 74 \ 3 scan0069 | |
| Piston failure on engine 1.190.12, caused by seizing due to insufficient lubrication. | 31th Jan 1929 | Box 74 \ 3 scan0070 | |
| Engine piston seizure, proposing increased clearance and detailing an inspector's account of a specific failure. | 31th Jan 1929 | Box 74 \ 3 scan0071 | |
| Engine repairs for the Admiralty and the War Office, and the question of who bears the cost. | 22th Mar 1917 | Box 74 \ 3 scan0072 | |
| And graph analysing gas leakage past pistons in relation to the number of rings used. | 22th Mar 1917 | Box 74 \ 3 scan0073 | |
| Continued analysis of leakage in relation to the number of rings and pressure. | 1st Mar 1917 | Box 74 \ 3 scan0074 | |
| Note attaching a photostat copy of an article and discussing gas flow calculations through orifices. | 1st Mar 1917 | Box 74 \ 3 scan0075 | |
| Issues with gas leakage past split type pistons, leading to audible noise and fumes inside the car. | 6th Feb 1920 | Box 74 \ 3 scan0076 | |
| Continued technical note (page 2) expressing dissatisfaction with dynamometer power and compression readings. | 28th Oct 1918 | Box 74 \ 3 scan0077 | |
| Extract discussing the need for extra piston rings to overcome rattles and improve gas tightness. | 13th Feb 1920 | Box 74 \ 3 scan0078 | |
| Complaint regarding fumes inside covered car bodies, with suggestions for remedies and a request for retrospective application to post-war models. | 24th Feb 1920 | Box 74 \ 3 scan0079 | |
| Testing piston clearances for cast iron and split pistons to address knocking and engine stiffness. | 12th Apr 1920 | Box 74 \ 3 scan0080 | |
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