| Description | Date | Identifier | |
| From 'R.' discussing axle design, dynamo drive issues, and proposed future improvements for experimental models. | 15th May 1923 | Box 49 \ 2 Scan164 | |
| Customer complaints regarding rear axle oil leaks and the oil filler position on a 40/50 Chassis. | 29th Jun 1923 | Box 49 \ 2 Scan165 | |
| Brake issues on the 20 HP model caused by over-oiling the back axle. | 16th Jul 1923 | Box 49 \ 2 Scan166 | |
| The failure of 40/50 axle gears, specifically a 'digging in' issue on the retard side. | 7th Jul 1923 | Box 49 \ 2 Scan167 | |
| Oil level issues and flooding in the rear axle of a 20-HP chassis. | 23th Jul 1923 | Box 49 \ 2 Scan168 | |
| Recent failures of 20HP rear axle bevel pinions and a request for analysis of new gear ratios. | 31th Oct 1923 | Box 49 \ 2 Scan169 | |
| Report discussing gear strength, pinion material, production difficulties, and the performance of cars in trials. | 31th Oct 1923 | Box 49 \ 2 Scan170 | |
| Proposal for a modification to the oil filler on the rear axle to improve accessibility. | 8th Oct 1923 | Box 49 \ 2 Scan171 | |
| Chassis gear ratios and corresponding engine revolutions for a 40/50 HP model. | 12th Nov 1923 | Box 49 \ 2 Scan172 | |
| Failure of a Goshawk bevel pinion and proposing design improvements to strengthen it. | 12th Nov 1923 | Box 49 \ 2 Scan173 | |
| The failure and subsequent dynamometer testing of a 20 HP rear axle pinion. | 13th Nov 1923 | Box 49 \ 2 Scan174 | |
| The endurance testing of a 20 HP rear axle, proposing to extend the test from 30 to 50 hours. | 14th Nov 1923 | Box 49 \ 2 Scan175 | |
| The failure of a 20 HP rear axle pinion made from air-hardened steel and the plan to test standard gears. | 15th Nov 1923 | Box 49 \ 2 Scan176 | |
| Requesting improvements to the 20 HP Rear Axle pinions, referencing another memo. | 17th Nov 1923 | Box 49 \ 2 Scan177 | |
| Test report on a 20 HP fine pitch rear axle pinion, comparing the durability of air-hardened steel versus case-hardened steel. | 1st Nov 1923 | Box 49 \ 2 Scan178 | |
| 50-hour endurance test of a 20 HP rear axle with modified C.H.N.S. pinion gears. | 1st Dec 1923 | Box 49 \ 2 Scan179 | |
| From R. to H.S. querying a design change and material selection for the 20 HP Rear Axle. | 12th Dec 1923 | Box 49 \ 2 Scan180 | |
| On testing 20 HP rear axle pinions, comparing the wear performance of air-hardened steel versus C.H.N.S. | 4th Dec 1923 | Box 49 \ 2 Scan181 | |
| Difficulties of producing replacement Gleason spiral bevel gears for rear axles. | 19th Dec 1923 | Box 49 \ 2 Scan182 | |
| Design and manufacturing of Gleason gears, focusing on tooth proportions, clearances, and cutter specifications. | 13th Oct 1923 | Box 49 \ 2 Scan183 | |
| Increasing gear strength by modifying circular pitch and teeth thickness, including a cross-section diagram. | 13th Oct 1923 | Box 49 \ 2 Scan184 | |
| Recommending the discontinuation of 16 x 52 Gleason gears for repairs, suggesting a 15 x 52 ratio replacement. | 20th Mar 1923 | Box 49 \ 2 Scan185 | |
| Specifications for the ignition, dynamo, starter motor, and battery of chassis 4-EX. | 28th Jun 1923 | Box 49 \ 2 Scan186 | |
| The testing of 20-HP axles to investigate potential failures of the bevel pinion after dynamometer and road testing. | 20th Mar 1924 | Box 49 \ 2 Scan187 | |
| Rear axle gear failures on the 20-HP model, including details of a returned noisy axle and other test failures. | 27th Mar 1924 | Box 49 \ 2 Scan188 | |
| Reassuring the Sales Department about the handling of future exceptional cases. | 27th Mar 1924 | Box 49 \ 2 Scan189 | |
| 20-HP axle failure in chassis 85-K-7, concerning a noisy axle and failed thrust bearing. | 30th May 1924 | Box 49 \ 2 Scan190 | |
| Modification to the 20-HP oil overflow stand pipe to prevent incorrect axle oil level readings. | 14th Jul 1924 | Box 49 \ 2 Scan191 | |
| Investigation into oil leakage from the rear hub, caused by excessive brake usage on long descents, and a proposed solution. | 14th Jul 1924 | Box 49 \ 2 Scan192 | |
| Testing for oil leakage from the rear hubs and axle under high temperatures. | 24th Oct 1924 | Box 49 \ 2 Scan193 | |
| Comparing the quiet running and performance of 11-tooth versus 12-tooth axles on the 20-HP model. | 16th Jul 1924 | Box 49 \ 2 Scan194 | |
| Requesting a reply regarding 20 HP 11- or 12-tooth axles, considering speed and fuel consumption. | 17th Jul 1924 | Box 49 \ 2 Scan195 | |
| Experimental tests and recommendations for low vs. high geared axles on the 20 HP chassis. | 8th Jul 1924 | Box 49 \ 2 Scan196 | |
| The axle gear ratio for the 20-HP car. | 21th Jul 1924 | Box 49 \ 2 Scan197 | |
| Change from a 12-tooth to an 11-tooth axle for 20 HP cars for better performance. | 24th Jul 1924 | Box 49 \ 2 Scan198 | |
| The adoption of 11-tooth versus 12-tooth axles for the 20 HP Chassis. | 23th Jul 1924 | Box 49 \ 2 Scan199 | |
| Comparing low versus high geared axles for the 20 HP chassis and recommending the low geared axle as standard. | 18th Jul 1924 | Box 49 \ 2 Scan200 | |
| Fitting 11 tooth pinions to the 20 HP chassis back axles. | 18th Aug 1924 | Box 49 \ 2 Scan201 | |
| Standardisation of chassis parts for side steering tube joint lubrication. | 6th Oct 1924 | Box 49 \ 2 Scan202 | |
| Standardisation sheet for a modification to a steering joint's lubrication system and its mileage testing. | 4th Nov 1924 | Box 49 \ 2 Scan203 | |
| Required changes to a noisy starter motor pinion and back axle on a GOSHAWK-11 car. | 8th Dec 1924 | Box 49 \ 2 Scan204 | |
| Noisy rear axle on 20HP Experimental Car, Chassis No. 6-G-2. | 2nd Jan 1925 | Box 49 \ 2 Scan205 | |
| The standardization of a thrust bearing for the 20 HP car. | 21th Aug 1925 | Box 49 \ 2 Scan206 | |
| Frequent replacement and associated costs of thrust races on the 20 HP chassis. | 27th Aug 1925 | Box 49 \ 2 Scan207 | |
| Back axle ratio for the Phantom, advocating for the 14 tooth axle. | 10th Jun 1926 | Box 49 \ 2 Scan208 | |
| Comparison of performance characteristics between 14-tooth and 15-tooth axles on early Phantom cars. | 1st Jul 1926 | Box 49 \ 2 Scan209 | |
| Continuation of correspondence regarding quiet 14-tooth axles and a request for a reply. | 1st Jul 1926 | Box 49 \ 2 Scan210 | |
| From Mr. Royce defining the light, normal, and overload conditions for the 20 HP chassis road springs. | 29th Mar 1919 | Box 49 \ 3 Scan001 | |
| Notification regarding an alteration to the rear spring width on the 20HP chassis. | 11th Apr 1919 | Box 49 \ 3 Scan002 | |
| Clarifying that instructions exist for several 20 HP parts, which are now being made. | 25th Jul 1919 | Box 49 \ 3 Scan003 | |
| Design of chassis rear spring pivots and U-bolt retention methods. | 1st Aug 1919 | Box 49 \ 3 Scan004 | |
| Full-scale drawing for a 20 HP rear spring pivot. | 1st Aug 1919 | Box 49 \ 3 Scan005 | |
| Drawing LeC.1126 with further information on the 20 HP rear spring pivots. | 7th Aug 1919 | Box 49 \ 3 Scan006 | |
| Design alteration for the 20 HP Chassis rear springs and fittings, requiring modifications to existing stock. | 1st Jun 1919 | Box 49 \ 3 Scan007 | |
| Design considerations and requested changes for various automotive components. | 18th May 1920 | Box 49 \ 3 Scan008 | |
| Preliminary road test report on the 'Goshawk' chassis. | 1st Jan 1921 | Box 49 \ 3 Scan009 | |
| Test report detailing performance issues with a vehicle's radiator, clutch, springing, and vibrations. | 1st Jan 1921 | Box 49 \ 3 Scan010 | |
| Performance characteristics of springing, vibrations, and steering for the 'Goshawk' model. | 12th Jan 1921 | Box 49 \ 3 Scan011 | |
| Technical report on issues and recommendations for the change speed, axle, and suspension. | 12th Jan 1921 | Box 49 \ 3 Scan012 | |
| Proposals for a small chassis, outlining engine specifications and two different construction methods. | 17th Nov 1920 | Box 49 \ 3 Scan013 | |
| Technical memo detailing the specifications for a small R.R. chassis, including gearbox and axle details. | 17th Nov 1930 | Box 49 \ 3 Scan014 | |
| Revised 20 HP chassis, detailing the brake gear arrangement and requirements for the rear road springs. | 27th Nov 1920 | Box 49 \ 3 Scan015 | |
| Sourcing of side channels for a frame from a specific supplier. | 27th Nov 1920 | Box 49 \ 3 Scan016 | |
| Technical memo discussing the springing, weight, vibrations, and steering of a vehicle, possibly the 'Goshawk' model. | 12th Jan 1921 | Box 49 \ 3 Scan017 | |
| Design modifications for a vehicle chassis and engine components. | 18th Jan 1921 | Box 49 \ 3 Scan018 | |
| The design modification of the Goshawk II front springs to a length of 36 inches. | 24th Jan 1921 | Box 49 \ 3 Scan019 | |
| Proposals for rear road springs for the Goshawk II. | 25th Jan 1921 | Box 49 \ 3 Scan020 | |
| Decision to increase the length of the rear road springs on the Goshawk 11. | 2nd Feb 1921 | Box 49 \ 3 Scan021 | |
| Design notes and specifications for the 'Goshawk 11' rear road spring, including load calculations. | 2nd Feb 1921 | Box 49 \ 3 Scan022 | |
| Technical document detailing the requirements for leaf springs, including thickness, primary set, and clips. | 2nd Feb 1921 | Box 49 \ 3 Scan023 | |
| Technical report on leaf spring design, discussing clips, rebound leaves, housing, and performance comparisons. | 2nd Feb 1921 | Box 49 \ 3 Scan024 | |
| Design specifications for a road spring, detailing Mr. Royce's requirements. | 2nd Feb 1921 | Box 49 \ 3 Scan025 | |
| Modifications to the 'Goshawk 11' front spring and front dumb iron, including an alternative attachment method proposed by Mr. Royce. | 5th Feb 1921 | Box 49 \ 3 Scan026 | |
| The 'Goshawk 11' rear dumb iron and axle clearance, detailing issues with the rear spring and shackle. | 5th Feb 1921 | Box 49 \ 3 Scan027 | |
| Design and assembly of rear suspension components, including cantilevers and U-bolts. | 5th Feb 1921 | Box 49 \ 3 Scan028 | |
| Alternative scheme for attaching the rear spring to the axle on the 'Goshawk II'. | 9th Feb 1921 | Box 49 \ 3 Scan029 | |
| Internal memorandum detailing design alterations requested by Mr. Royce for the 'GOSHAWK II' project. | 10th Feb 1921 | Box 49 \ 3 Scan030 | |
| Alteration requests from Mr. Royce for the 'Goshawk II' front spring shackle, scheme 741. | 10th Feb 1921 | Box 49 \ 3 Scan031 | |
| Modifications to the 'Goshawk II' front spring shackle. | 14th Feb 1921 | Box 49 \ 3 Scan032 | |
| On modifications to the Goshawk 11 front spring shackle. | 5th Mar 1921 | Box 49 \ 3 Scan033 | |
| Forgotten blueprint for a 'Coshawk 11' front spring shackle. | 7th Mar 1921 | Box 49 \ 3 Scan034 | |
| Design and analysis methods for 'Goshawk II+' road springs. | 1st Mar 1921 | Box 49 \ 3 Scan035 | |
| Stress analysis of springs and seeking feedback from Mr. Royce on the method and results. | 8th Mar 1921 | Box 49 \ 3 Scan036 | |
| Design and analysis methods for Goshawk II road springs. | 8th Mar 1921 | Box 49 \ 3 Scan037 | |
| Development of springs for 'N' Schemes 788 and 790, which are being sent for review to Mr. Royce. | 1st Mar 1921 | Box 49 \ 3 Scan038 | |
| The design, analysis, and building methods for the Goshawk II front and rear road springs. | 10th Mar 1921 | Box 49 \ 3 Scan039 | |
| Correction of stress in leaf springs and design difficulties with the spring eye. | 10th Mar 1921 | Box 49 \ 3 Scan040 | |
| Approval and development of front road springs for the Goshawk II. | 15th Mar 1921 | Box 49 \ 3 Scan041 | |
| Method of constructing road springs for the Goshawk II. | 16th Mar 1921 | Box 49 \ 3 Scan042 | |
| Spring design, comparing square-ended plates with stiffer ends and referencing various design schemes. | 16th Mar 1921 | Box 49 \ 3 Scan043 | |
| Mr. Royce's instructions for the Goshawk II rear springs and fittings. | 25th Apr 1921 | Box 49 \ 3 Scan044 | |
| Modifications to 'Goshawk 11' front springs. | 20th May 1921 | Box 49 \ 3 Scan045 | |
| Design and potential stress points of the Goshawk 11 rear springs. | 22th Jun 1921 | Box 49 \ 3 Scan046 | |
| Design and potential stress points of the Goshawk 11 rear springs. | 22th Jun 1921 | Box 49 \ 3 Scan047 | |
| Post-war complaints about straight-sided cord tyres, their performance, cost, and issues on American roads. | 22th Jun 1921 | Box 49 \ 3 Scan048 | |
| Suspension design, comparing different spring types and the effects of friction, with reference to the Goshawk 11. | 22th Jun 1921 | Box 49 \ 3 Scan049 | |
| Performance, costs, and issues related to straight-sided cord tyres versus canvas tyres. | 22th Jun 1921 | Box 49 \ 3 Scan050 | |
| Suspension design, damping friction in relation to cord tyres, and the Goshawk 11 model. | 22th Jun 1921 | Box 49 \ 3 Scan051 | |
| Three alternative methods for the 'Goshawk II' front anchorage of the rear spring. | 30th Jun 1921 | Box 49 \ 3 Scan052 | |
| Modifications to rear road spring anchorages using graphite-containing oil-less bearings. | 1st Jul 1921 | Box 49 \ 3 Scan053 | |
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