| Description | Date | Identifier | |
| Of notes from Mr. Royce concerning various vehicle components following a visit to West Wittering. | 22th Jul 1920 | Box 43 \ 1 Scan020 | |
| Increased starter motor noise and a suggestion to interpose a spring to make it more silent. | 1st Aug 1920 | Box 43 \ 1 Scan021 | |
| Providing criticisms and notes on the design of a U.S.A. Phantom Generator. | 30th Sep 1927 | Box 43 \ 1 Scan022 | |
| Control brush settings, overheating issues, and the design of cutout contact points. | 30th Sep 1927 | Box 43 \ 1 Scan023 | |
| Comparison of windings for Derby & Springfield cutouts. | 5th Oct 1927 | Box 43 \ 1 Scan024 | |
| Letter from the American to the English branch regarding a generator wiring diagram error and issues with electrical polarity. | 26th Oct 1927 | Box 43 \ 1 Scan025 | |
| Modifications and testing of generator components such as brushes, armature plates, and cutouts. | 26th Oct 1927 | Box 43 \ 1 Scan026 | |
| Performance of a cut out and the soldering of contacts in production cars. | 15th Dec 1927 | Box 43 \ 1 Scan027 | |
| Various technical points regarding a generator, including polarity, air gap, and operating temperatures. | 15th Dec 1927 | Box 43 \ 1 Scan028 | |
| Construction and winding details for an Auto Charge Control Switch. | 3rd Feb 1928 | Box 43 \ 1 Scan029 | |
| Internal communication regarding the testing of a switch before despatch to the U.S.A. and sending updated prints to Mr. Olley. | 9th Feb 1928 | Box 43 \ 1 Scan030 | |
| Winding specifications for an auto charge control switch. | 9th Feb 1928 | Box 43 \ 1 Scan031 | |
| Wiring diagram for the connections of R.R. Auto-Switch Units. | 4th Feb 1928 | Box 43 \ 1 Scan032 | |
| Letter discussing the Auto Charge Control Switch, its potential testing, and a comparison of battery charging systems. | 28th Feb 1928 | Box 43 \ 1 Scan033 | |
| Letter discussing the final arrangement of a 12-volt auto charge control switch and its benefits over standard charging rates. | 29th Mar 1928 | Box 43 \ 1 Scan034 | |
| Graph showing the performance characteristics of a generator under test conditions. | 29th Nov 1927 | Box 43 \ 1 Scan035 | |
| Letter recommending the use of thinner laminations in the generator armature following successful tests. | 11th Jun 1928 | Box 43 \ 1 Scan036 | |
| Modifications to the Throttle Body for the Series IX 'EAGLE' engine, including changes to throat and barrel dimensions. | 4th Feb 1922 | Box 43 \ 1 Scan037 | |
| Outlining the test plan for the experimental 'Eagle' engine following completion of 'Condor' engine tests. | 1st Aug 1922 | Box 43 \ 1 Scan038 | |
| Instructions for an 8-hour engine test and discussion of a fuel supply proposal from British Petroleum. | 1st Aug 1922 | Box 43 \ 1 Scan039 | |
| Short telegram-style message concerning engine settings for the King's Cup air race. | 7th Sep 1922 | Box 43 \ 1 Scan040 | |
| List of proposed modifications for the 'Eagle' engine. | 21th Oct 1922 | Box 43 \ 1 Scan041 | |
| List of proposed modifications and considerations for an engine, likely the Condor. | 16th Jan 1923 | Box 43 \ 1 Scan042 | |
| Reputational damage caused by a third-party selling old, poor-condition Eagle engines and the company's response. | 16th Jan 1923 | Box 43 \ 1 Scan043 | |
| Copy of a letter sent to the press clarifying the use of their aero engines by a German firm. | 10th Nov 1923 | Box 43 \ 1 Scan044 | |
| Enquiring about a modification, if it has been tested, and what was suggested. | 1st Mar 1924 | Box 43 \ 1 Scan045 | |
| Issues with induction pipes and float chamber covers on Eagle IX engines for K.L.M. Rotterdam. | 1st Mar 1924 | Box 43 \ 1 Scan046 | |
| Modification to the Oil Drain Pipes from Camshaft Casings to Crankcase on Eagle Series IX Engines. | 5th May 1924 | Box 43 \ 1 Scan047 | |
| Cover letter for a standardisation sheet regarding the thickening of camshaft casings on 'Eagle' II engines. | 26th Jun 1924 | Box 43 \ 1 Scan048 | |
| Proposal to increase the thickness of the camshaft casings by 50% on Eagle IX Engines due to breakages. | 14th May 1924 | Box 43 \ 1 Scan049 | |
| 100-hour test of an Eagle 1X engine to prove new parts. | 19th Aug 1924 | Box 43 \ 1 Scan050 | |
| Engine test, detailing issues with rocker box flooding and carburetter vibration. | 19th Aug 1924 | Box 43 \ 1 Scan051 | |
| Component failures including oil pipe dampers, valve springs, hand starter, and magneto drives. | 19th Aug 1924 | Box 43 \ 1 Scan052 | |
| 50-hour test bed run detailing issues with engine components. | 20th Aug 1924 | Box 43 \ 1 Scan053 | |
| Engine test issues including magneto failure, leaking cylinder jackets, and valve clearance problems. | 19th Aug 1924 | Box 43 \ 1 Scan054 | |
| Valve stretch and wear measurements after engine dismantling. | 19th Aug 1924 | Box 43 \ 1 Scan055 | |
| Test averages, breakages, and a summary of dismantling conditions. | 19th Aug 1924 | Box 43 \ 1 Scan056 | |
| The condition of various engine components following a test. | 8th Feb 1924 | Box 43 \ 1 Scan057 | |
| Proposal to test and use steel for the lower section induction pipe on 'Eagle' IX engines. | 25th Aug 1924 | Box 43 \ 1 Scan058 | |
| Aero engine reliability, comparing it with durability, and considering design choices for the Eagle and Super Eagle engines. | 2nd Sep 1924 | Box 43 \ 1 Scan059 | |
| Assignment of designer 'E.' to the Super Eagle engine project and the reliability of the Eagle IX engine. | 25th Jun 1924 | Box 43 \ 1 Scan060 | |
| Preparations for hangar tests on the Eagle IX engine. | 25th Jun 1924 | Box 43 \ 1 Scan061 | |
| Requesting the manufacture and testing of proposed 'Eagle' XX engine crankshafts against the standard 'Eagle' IX model. | 10th Jul 1924 | Box 43 \ 1 Scan062 | |
| The revised support for the carburettor and induction pipes on the Eagle IX aero engine. | 8th Oct 1924 | Box 43 \ 1 Scan063 | |
| From R. on new aero engine designs, comparing 12-cylinder and 16-cylinder models and recommending an alternative engine. | 11th May 1924 | Box 43 \ 1 Scan064 | |
| Design rationale and modifications for a new ultra-high-speed engine. | 20th Jan 1925 | Box 43 \ 1 Scan065 | |
| Stressing the importance of testing a new induction pipe system and valves for the 'Eagle' IX aero-engine. | 20th Jan 1925 | Box 43 \ 1 Scan066 | |
| Requesting the conversion of a Condor Hangar for a 50-hour test on an Eagle engine with new induction pipes. | 20th Jan 1925 | Box 43 \ 1 Scan067 | |
| The testing schedule for an Eagle IX engine with improved induction pipes and valves. | 21th Jan 1925 | Box 43 \ 1 Scan068 | |
| The development of the Eagle 1X engine. | 12th Jul 1925 | Box 43 \ 1 Scan069 | |
| Modifications and endurance testing of an Eagle 1X engine (No. 9-E-456). | 21th Jan 1925 | Box 43 \ 1 Scan070 | |
| 50-hour, 4-run engine endurance test. | 25th Sep 1924 | Box 43 \ 1 Scan071 | |
| Experimental report, page 3, detailing cylinder leaks, component breakages, and performance data from a running test. | 1st Feb 1925 | Box 43 \ 1 Scan072 | |
| Engine vibrations felt at various points on a rigid test bed. | 25th Sep 1924 | Box 43 \ 1 Scan073 | |
| Issues and recommendations for carburetter stays and related components. | 2nd Feb 1925 | Box 43 \ 1 Scan074 | |
| The weight comparison of new and old pipes and engine tappet clearances. | 8th Feb 1925 | Box 43 \ 1 Scan075 | |
| Rough sketch of an Eagle cylinder showing the position of leaks developed during a 50-hour test. | 2nd Feb 1925 | Box 43 \ 1 Scan076 | |
| Blank document page with a filing room date stamp from Derby. | 3rd Feb 1925 | Box 43 \ 1 Scan077 | |
| Cover letter for a 50-hour test dismantling report on engine 9-E-456. | 1st Feb 1925 | Box 43 \ 1 Scan078 | |
| Dismantling report following a 50-hour test on engine 9-E-456, detailing the condition of the carburettors, reduction gear, and valves. | 2nd Feb 1925 | Box 43 \ 1 Scan079 | |
| The condition of engine components including valves, cylinders, and gears after a test run. | 1st Feb 1925 | Box 43 \ 1 Scan080 | |
| Testing of 13 Eagle IX engines using a specific fuel, Krasnagnarsky spirit, for the Russian Trade Delegation. | 13th Mar 1925 | Box 43 \ 1 Scan081 | |
| Laboratory analysis of a sample gallon of Krasnagnarsky Spirit. | 17th Mar 1925 | Box 43 \ 1 Scan082 | |
| The analysis and bed testing of Krasnagnarsky Spirit fuel on an Eagle VIII engine. | 17th Mar 1925 | Box 43 \ 1 Scan083 | |
| Performance comparison table for an engine using B.P. and Krasnagnarsky spirit fuel. | 17th Mar 1925 | Box 43 \ 1 Scan084 | |
| Laboratory report on the distillation and composition of a Krasnagnarsky Spirit sample. | 16th Mar 1925 | Box 43 \ 1 Scan085 | |
| Increasing the power of the Eagle engine. | 28th Aug 1925 | Box 43 \ 1 Scan086 | |
| Eagle engine power tests. | 1st Aug 1925 | Box 43 \ 1 Scan087 | |
| Camshaft comparison between the Eagle V111 and Eagle 1X. | 26th Aug 1925 | Box 43 \ 1 Scan088 | |
| Carburetter comparison for Eagle engines with different setups and compression ratios. | 26th Aug 1925 | Box 43 \ 1 Scan089 | |
| Comparing carburettor and compression ratio performance curves for the Eagle IX engine. | 1st Aug 1925 | Box 43 \ 1 Scan090 | |
| Comparing compression ratios and carburetters on different engine configurations. | 26th Aug 1925 | Box 43 \ 1 Scan091 | |
| Page discussing future investigations for the Eagle 1X engine, including induction systems and valve bounce analysis. | 25th Sep 1924 | Box 43 \ 1 Scan092 | |
| Page discussing tests on compression ratios, pistons, and sparking plugs. | 1st Aug 1925 | Box 43 \ 1 Scan093 | |
| The theoretical power increase from higher compression ratios in engines. | 1st Aug 1925 | Box 43 \ 1 Scan094 | |
| Comparing B.M.E.P. and power curves for Condor 1V and Eagle engines. | 28th Aug 1925 | Box 43 \ 1 Scan095 | |
| Performance curve comparing two different camshafts (A and B) for the Eagle engine, plotting Brake Horsepower and Brake Mean Effective Pressure against RPM. | 28th Aug 1925 | Box 43 \ 1 Scan096 | |
| Blank page with a Print Room stamp from Derby. | 28th Aug 1925 | Box 43 \ 1 Scan097 | |
| Performance comparison graph of two camshaft configurations (Eagle VIII and Eagle IX) plotting B.HP and B.M.E.P. against engine R.P.M. | 28th Aug 1925 | Box 43 \ 1 Scan098 | |
| Blank page with a Print Room date stamp from Derby. | 28th Aug 1925 | Box 43 \ 1 Scan099 | |
| Performance comparison graph for Eagle VIII and Eagle IX carburettors at a 5.27/1 compression ratio. | 28th Aug 1925 | Box 43 \ 1 Scan100 | |
| Blank page with a Print Room stamp in the bottom right corner. | 28th Aug 1925 | Box 43 \ 1 Scan101 | |
| Performance comparison graph of Eagle VIII and IX carburettors on an engine with Eagle IX camshafts. | 29th Aug 1925 | Box 43 \ 1 Scan102 | |
| Performance comparison curves for Eagle VIII and Eagle IX carburettors. | 29th Aug 1925 | Box 43 \ 1 Scan103 | |
| Performance graph comparing BHP and BMEP against RPM for different engine compression ratios. | 28th Aug 1925 | Box 43 \ 1 Scan104 | |
| Blank page with a Print Room date stamp. | 28th Aug 1925 | Box 43 \ 1 Scan105 | |
| Graph comparing engine performance curves (BHP and BMEP) at different compression ratios. | 28th Aug 1925 | Box 43 \ 1 Scan106 | |
| Performance graph comparing Eagle VIII and Eagle IX carburettors, plotting B.HP and B.M.E.P. against R.P.M. | 28th Aug 1925 | Box 43 \ 1 Scan107 | |
| Performance graph of actual and theoretical BHP and BMEP curves against RPM for different carburetor configurations. | 28th Aug 1925 | Box 43 \ 1 Scan108 | |
| Graph plotting actual and theoretical B.H.P and B.M.E.P curves against R.P.M. for different engine configurations. | 28th Aug 1925 | Box 43 \ 1 Scan109 | |
| Heavily faded document with a red 'Print Room' stamp on the bottom right. | 28th Aug 1925 | Box 43 \ 1 Scan110 | |
| Performance results of the boosted Eagle engine and mentioning future developments with the Fancom X engine. | 1st Sep 1925 | Box 43 \ 1 Scan111 | |
| Instruction note for fitting a hardened sun wheel and planet to an Eagle IX engine. | 20th Jan 1925 | Box 43 \ 1 Scan112 | |
| Alternative methods for chassis lubrication, specifically clip-on oil guns. | 21th Oct 1925 | Box 43 \ 1 Scan113 | |
| Engine troubles for Imperial Airways, including total hours flown for various engine models and components. | 28th Jan 1926 | Box 43 \ 1 Scan114 | |
| Confidential memo regarding service disruptions and the confidentiality of information concerning Lion and Puma engines. | 19th Mar 1926 | Box 43 \ 1 Scan115 | |
| Questioning the decision to use inserted valve seats for Eagles 8 & 9 cylinders at a late stage. | 19th Mar 1926 | Box 43 \ 1 Scan116 | |
| Feedback from a Luft Hansa Chief Engineer regarding the Eagle IX engine's performance and a resolved valve seat erosion issue. | 28th May 1927 | Box 43 \ 1 Scan117 | |
| Minutes of a conference discussing proposed alterations for American cars, specifically Report B. | 2nd Dec 1919 | Box 43 \ 2 Scan001 | |
| Suspension components, comparing grease cups to oilers and proposing design improvements. | 2nd Dec 1919 | Box 43 \ 2 Scan002 | |
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