| Description | Date | Identifier | |
| 500 c.c. Rudge Unit, detailing running time and tests with different camshafts. | 13th Mar 1936 | Box 133 \ 1 scan0006 | |
| Analysis of cylinder head designs, air consumption, and detonation characteristics with various fuels. | 13th Mar 1936 | Box 133 \ 1 scan0007 | |
| Analysis comparing the performance of the Rudge, P.V.G., and Bentley single-cylinder engine units, focusing on estimated motoring losses. | 13th Mar 1936 | Box 133 \ 1 scan0008 | |
| Engine timing comparisons and a summary of observed mechanical failures. | 13th Mar 1936 | Box 133 \ 1 scan0009 | |
| List of proposed future engine tests including temperature, detonation, and air consumption measurements. | 13th Mar 1936 | Box 133 \ 1 scan0010 | |
| Comparative table of constructional details for P.V.G., Rudge, and Bentley engines. | 2nd Mar 1936 | Box 133 \ 1 scan0011 | |
| Graph showing power variations with different exhaust systems for a 500cc Rudge unit. | 2nd Mar 1936 | Box 133 \ 1 scan0012 | |
| Graph showing power variations with different induction systems for a 500cc Rudge unit. | 7th Jan 1936 | Box 133 \ 1 scan0013 | |
| Blueprint graph comparing power curves and camshaft performance for a 500cc Rudge unit. | 21th Jul 1926 | Box 133 \ 1 scan0014 | |
| Performance graph showing air consumption and volumetric efficiency for a 500CC Rudge unit, comparing Penthouse and Hemispherical configurations. | 4th Mar 1936 | Box 133 \ 1 scan0015 | |
| Power curves for a 500cc Rudge Unit with a semi-hemispherical head, comparing performance with one versus two exhaust valves. | 23th Mar 1936 | Box 133 \ 1 scan0016 | |
| Graph comparing power, B.M.E.P, and specific consumption for Penthouse, Hemispherical, and Semi-Hemispherical cylinder heads on a 500cc Rudge Unit. | 23th Mar 1936 | Box 133 \ 1 scan0017 | |
| Graph comparing valve lift against crankshaft displacement for Rudge, Bentley, and modified camshafts on a 500cc unit. | 2nd Feb 1936 | Box 133 \ 1 scan0018 | |
| Graph showing power curves for a 500cc Rudge unit with different compression ratios. | 5th Mar 1936 | Box 133 \ 1 scan0019 | |
| Estimated comparison of power curves and valve timings for 500cc Rudge and PVG Single-II units. | 13th Mar 1936 | Box 133 \ 1 scan0020 | |
| Graph of motoring loss curves comparing Rudge and P.V.G. engines. | 19th Mar 1932 | Box 133 \ 1 scan0021 | |
| Graph of motoring loss curves comparing a 500cc Rudge unit with a Bentley V.R. engine. | 13th Mar 1936 | Box 133 \ 1 scan0022 | |
| Graph comparing power curves and engine specifications for Rudge and Bentley units. | 13th Mar 1936 | Box 133 \ 1 scan0023 | |
| Letter from Rudge-Whitworth Ltd discussing the specifications and availability of cylinder heads with different plug positions. | 13th Mar 1936 | Box 133 \ 1 scan0024 | |
| Performance graph comparing a 3.9-litre 6-cylinder engine with a single-cylinder engine test, showing B.H.P and B.M.E.P against R.P.M. | 7th Feb 1930 | Box 133 \ 1 scan0025 | |
| Letter to Messrs. Rudge-Whitworth Ltd. requesting to borrow a pattern for a cylinder head. | 16th Mar 1936 | Box 133 \ 1 scan0026 | |
| Letter from Rudge-Whitworth Ltd regarding the availability of castings and patterns. | 23th Mar 1936 | Box 133 \ 1 scan0027 | |
| Letter from William Mills Ltd. regarding permission to supply two Aluminium Bronze Cylinder Heads from a pattern provided by Rudge Whitworth Limited. | 25th Mar 1936 | Box 133 \ 1 scan0028 | |
| Letter to William Mills, Ltd. enquiring about the supply and price of Rudge-Whitworth motor cycle cylinder head castings. | 27th Mar 1936 | Box 133 \ 1 scan0029 | |
| Letter to G.L. Hack of Messrs. Rudge-Whitworth Ltd. concerning a follow-up with Messrs. William Mills about castings. | 27th Mar 1936 | Box 133 \ 1 scan0030 | |
| Letter from William Mills Ltd. providing a price quote for Aluminium Bronze Cylinder Heads. | 28th Mar 1936 | Box 133 \ 1 scan0031 | |
| Request to order two Aluminium Bronze Cylinder Heads from Messrs. William Mills & Co. Ltd. | 31th Mar 1936 | Box 133 \ 1 scan0032 | |
| Placing an official order for two 'Heads' based on a letter received from Messrs. Wm. Mills, Ltd. | 1st Apr 1936 | Box 133 \ 1 scan0033 | |
| Outlining the required setup for No. 4 Test Bed for a Single Cylinder Bentley Unit. | 16th Apr 1936 | Box 133 \ 1 scan0034 | |
| Necessary arrangements and equipment for the installation of a Bentley Single Cylinder unit on a test bed. | 16th Apr 1936 | Box 133 \ 1 scan0035 | |
| Modification to the connecting rod for a Bentley O.H.C. Single Cylinder Unit. | 16th Apr 1936 | Box 133 \ 1 scan0036 | |
| Request to make valve seats and an inserting tool for a 500 c.c. Rudge Unit. | 16th Apr 1936 | Box 133 \ 1 scan0037 | |
| Requesting lagging for the boost piping on a 500 c.c. Rudge Unit. | 22th Apr 1936 | Box 133 \ 1 scan0038 | |
| Order request to Tecalemit Ltd. for two oil filter elements for a Single Cylinder Bentley Unit. | 24th Apr 1936 | Box 133 \ 1 scan0039 | |
| The order of three Hardy fabrics with specific dimensions for a 500cc Rudge Unit. | 6th May 1936 | Box 133 \ 1 scan0040 | |
| Internal order request for a forged piston for a 500 c.c. Rudge Ulster engine. | 7th May 1936 | Box 133 \ 1 scan0041 | |
| Very urgent request for the production of six exhaust valves for a 500 c.c. unit. | 7th May 1936 | Box 133 \ 1 scan0042 | |
| The rocker geometry layout and a scheme for cams and valve springs for a Bentley O.H.C. car engine single cylinder unit. | 7th May 1936 | Box 133 \ 1 scan0043 | |
| Letter to Rudge-Whitworth Ltd. regarding breaking exhaust valves on a 500 c.c. 'Ulster' Rudge engine. | 7th May 1936 | Box 133 \ 1 scan0044 | |
| Letter from Rudge-Whitworth Ltd discussing exhaust valve material (KE.965) and failure rates. | 9th May 1936 | Box 133 \ 1 scan0045 | |
| Letter from Rudge-Whitworth to Rolls-Royce with technical suggestions for valve lift and head-to-stem radius. | 8th May 1936 | Box 133 \ 1 scan0046 | |
| Letter to Rudge-Whitworth Ltd. regarding unsuitable modified cylinder head castings and requesting drawings. | 8th May 1936 | Box 133 \ 1 scan0047 | |
| Internal request to place an order for four inlet valves from Rudge-Whitworth Ltd. | 11th May 1936 | Box 133 \ 1 scan0048 | |
| Letter to Rudge-Whitworth Ltd. regarding exhaust valve testing, temperature, fractures, and replacement. | 11th May 1936 | Box 133 \ 1 scan0049 | |
| Letter requesting the supply of four inlet valves for a semi-hemispherical head. | 11th May 1936 | Box 133 \ 1 scan0050 | |
| Letter to Messrs. Rudge-Whitworth Ltd. enclosing micro-photographs and a sketch of a valve head. | 14th May 1936 | Box 133 \ 1 scan0051 | |
| Request to manufacture two modified orifice plates for a Bentley Single Cylinder Unit. | 22th May 1936 | Box 133 \ 1 scan0052 | |
| Order for a camshaft with specific timing settings for a 500 c.c. Rudge Unit. | 27th May 1936 | Box 133 \ 1 scan0053 | |
| The in-house machining of a cylinder head casting for a 500 c.c. Rudge Unit. | 28th May 1936 | Box 133 \ 1 scan0054 | |
| Requesting an electric dynamometer for testing a 500 c.c. Rudge Unit. | 4th Jun 1936 | Box 133 \ 1 scan0055 | |
| Letter requesting spare parts for a 1934 'Ulster' engine from Messrs. Rudge Whitworth Ltd. | 19th Jun 1936 | Box 133 \ 1 scan0056 | |
| Official order be placed with Rudge Whitworth Ltd. for spares for a 500 c.c. Rudge Unit. | 19th Jun 1936 | Box 133 \ 1 scan0057 | |
| Letter from Rudge-Whitworth Ltd concerning a big end bearing failure and the dispatch of replacement parts. | 22th Jun 1936 | Box 133 \ 1 scan0058 | |
| Second page of a continued letter from Rudge-Whitworth Ltd. | 1st Nov 1935 | Box 133 \ 1 scan0059 | |
| Official order be passed to Messrs. Rudge Whitworth Ltd. for spares. | 22th Jun 1936 | Box 133 \ 1 scan0060 | |
| Letter to Messrs. Rudge Whitworth Ltd. requesting spare parts for a 1934 Ulster engine. | 22th Jun 1936 | Box 133 \ 1 scan0061 | |
| Letter to Rudge-Whitworth Ltd. regarding modifications to semi-hemispherical head castings and an oil leakage issue. | 23th Jun 1936 | Box 133 \ 1 scan0062 | |
| Letter enquiring about the differences between previously used pistons and the newly adopted standard Aerolite pistons. | 23th Jun 1936 | Box 133 \ 1 scan0063 | |
| Letter from Rudge-Whitworth Ltd regretting they are unable to undertake the machining of semi-hemispherical head castings and giving related advice. | 25th Jun 1936 | Box 133 \ 1 scan0064 | |
| Continued letter discussing engine oil consumption, temperature, and potential crankcase leakage. | 1st Nov 1926 | Box 133 \ 1 scan0065 | |
| Letter from Rudge-Whitworth discussing main bearings, standardising Aerolite pistons, and asking for information on chromium plating and water cooling. | 1st Nov 1926 | Box 133 \ 1 scan0066 | |
| Two invoices from Rudge-Whitworth Ltd. and seeking payment approval. | 29th Jun 1936 | Box 133 \ 1 scan0067 | |
| Letter to Rudge Witworth Ltd. regarding machining issues and results from chromium-plated cylinder bores. | 30th Jun 1936 | Box 133 \ 1 scan0068 | |
| Progress report on engine testing, detailing gap wear measurements, benefits of water cooling, and detonation performance. | 30th Jun 1936 | Box 133 \ 1 scan0069 | |
| Chart showing the dimensions of a Chromium Plated Cylinder Liner bore when new and after 53 hours of running. | 15th Apr 1936 | Box 133 \ 1 scan0070 | |
| Requesting the return of a Rudge engine to its makers for a thorough overhaul. | 30th Jun 1936 | Box 133 \ 1 scan0071 | |
| Overhaul of a 500 C.C. Rudge Unit and preparations for its return and further modification. | 30th Jun 1936 | Box 133 \ 1 scan0072 | |
| Proposal for the re-organization of chassis single cylinder unit test beds. | 1st Jul 1936 | Box 133 \ 1 scan0073 | |
| Official order be placed with Messrs. Rudge-Whitworth Ltd. for various parts. | 4th Jul 1936 | Box 133 \ 1 scan0074 | |
| The machining of a Spectre cylinder head for induction port tests. | 30th Jul 1936 | Box 133 \ 1 scan0075 | |
| The engine mountings of a 560 c.c. Rudge Unit and recommending a similar, more flexible design. | 31th Jul 1936 | Box 133 \ 1 scan0076 | |
| Summary of performance, detonation, and smoothness issues with a high power cylinder head. | 27th Jul 1936 | Box 133 \ 1 scan0077 | |
| Mathematical investigation into a Chevrolet-style combustion chamber and a discussion on high power engine design and valve gear. | 27th Jul 1936 | Box 133 \ 1 scan0078 | |
| Curing engine detonation by modifying cylinder head design, including valve configuration and combustion chamber angle. | 27th Jul 1936 | Box 133 \ 1 scan0079 | |
| Comparison of M.E.P. and power gains at various RPMs for different engine cylinder heads. | 27th Jul 1936 | Box 133 \ 1 scan0080 | |
| Summary of research and difficulties in incorporating a twin inlet valve head into a main engine. | 27th Jul 1936 | Box 133 \ 1 scan0081 | |
| Graph of smoothness curves for a turbulent high power head, plotting flame travel against flame volume and volume/travel increase ratio. | 11th Jul 1926 | Box 133 \ 1 scan0082 | |
| Comparison of High Power and Chevrolet cylinder heads, showing valve sizes and cross-sectional diagrams. | 11th Jul 1926 | Box 133 \ 1 scan0083 | |
| Power comparison graph of various High Power Bentley cylinder heads. | 10th Jul 1936 | Box 133 \ 1 scan0084 | |
| Performance comparison graph between a single cylinder unit and a main engine. | 10th Jul 1936 | Box 133 \ 1 scan0085 | |
| Letter from Rudge-Whitworth detailing the overhaul and performance observations of a 500 c.c. engine. | 29th Jul 1936 | Box 133 \ 1 scan0086 | |
| Letter from Rudge-Whitworth Ltd. regarding valve timing, oil consumption, and exhaust valve issues. | 3rd Aug 1936 | Box 133 \ 1 scan0087 | |
| Outlining tests for a single-cylinder high-power head, focusing on power loss, distortion, and oil consumption. | 3rd Aug 1936 | Box 133 \ 1 scan0088 | |
| Cracked inlet valve from a Bentley Unit requiring inspection. | 10th Aug 1936 | Box 133 \ 1 scan0089 | |
| The order of tachometers and a cupboard for single-cylinder chassis units. | 12th Aug 1936 | Box 133 \ 1 scan0090 | |
| Request to repair a big end bearing on a Bentley Unit due to metal fatigue. | 15th Aug 1936 | Box 133 \ 1 scan0091 | |
| Development programme for a single-cylinder high-power head, based on a 10% power improvement over a Bentley head. | 4th Aug 1936 | Box 133 \ 1 scan0092 | |
| Outlining requirements and a development program for engine valves and associated components. | 4th Aug 1936 | Box 133 \ 1 scan0093 | |
| Blueprint detailing modifications to an inlet valve and port for a high power head. | 30th Jul 1934 | Box 133 \ 1 scan0094 | |
| Drawing showing modifications to the exhaust valve and port for a high power head. | 30th Jul 1934 | Box 133 \ 1 scan0095 | |
| Blueprint showing a cross-section of a high power head with an inclined sparking plug. | 6th Aug 1927 | Box 133 \ 1 scan0096 | |
| Arrangement of a variable lift mechanism for a single inlet high power head. | 6th Aug 1927 | Box 133 \ 1 scan0097 | |
| Announcing the cancellation of all future work on the 500 c.c. Rudge Unit. | 18th Aug 1936 | Box 133 \ 1 scan0098 | |
| Lost valve gear components for the Single Cylinder Bentley Unit, requesting new parts as all spares have been scrapped. | 18th Aug 1936 | Box 133 \ 1 scan0099 | |
| Requesting a dynamometer and starting tackle be moved to the tackle stores for safety. | 21th Aug 1936 | Box 133 \ 1 scan0100 | |
| Investigation into complaints of valve bounce on a Phantom III large valve cylinder head. | 3rd Sep 1936 | Box 133 \ 1 scan0101 | |
| Bentley cylinder head failure on a test unit due to an obsolete exhaust valve, and the need for a replacement. | 3rd Sep 1936 | Box 133 \ 1 scan0102 | |
| Invoice from Rudge-Whitworth for dismantling flywheels, for which no order was issued. | 11th Sep 1936 | Box 133 \ 1 scan0103 | |
| Internal request to place an official order with Messrs. Rudge-Whitworth Ltd. for dismantling and building up flywheels. | 12th Sep 1936 | Box 133 \ 1 scan0104 | |
| Report summarizing the work and test results on a 500 c.c. Rudge Unit. | 17th Sep 1936 | Box 133 \ 1 scan0105 | |
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