| Description | Date | Identifier | |
| Invitation to E.H. Micklewood Esq. to visit the Derby Works to view his experimental engine. | 14th Aug 1924 | Box 54 \ 4 Scan026 | |
| Tests of a Micklewood 2-stroke engine. | 1st Sep 1924 | Box 54 \ 4 Scan027 | |
| The poor performance of the Micklewood 2-stroke engine during bench tests. | 1st Sep 1924 | Box 54 \ 4 Scan028 | |
| Engine performance based on indicator cards, including compression, ignition, and carburation. | 1st Sep 1924 | Box 54 \ 4 Scan029 | |
| Engine performance issues related to pumping losses, exhaust valve design, and results from motoring tests. | 5th Sep 1924 | Box 54 \ 4 Scan030 | |
| Engine performance, focusing on piston friction, scavenging, and pumping losses. | 12th Jul 1928 | Box 54 \ 4 Scan031 | |
| Page discussing potential engine redesigns regarding the rotary valve, ports, and piston friction for improved performance. | 12th Jul 1928 | Box 54 \ 4 Scan032 | |
| Engine performance indicator diagrams for a Micklewood 2-stroke engine, showing pressure versus crank angle. | 12th Jul 1928 | Box 54 \ 4 Scan033 | |
| Performance analysis and specification drawings for the Micklewood 2 Stroke engine. | 12th Jul 1928 | Box 54 \ 4 Scan034 | |
| Cross-sectional diagram of a super-atmospheric, scavenged, two-stroke-cycle engine with a parts legend. | 8th Sep 1924 | Box 54 \ 4 Scan035 | |
| Questioning the reasons for testing a Micklewood 2-stroke engine. | 8th Sep 1924 | Box 54 \ 4 Scan036 | |
| Cover note forwarding instructions for tests on a Micklewood 2-stroke engine. | 9th Sep 1924 | Box 54 \ 4 Scan037 | |
| Request for instructions regarding the Micklewood 2-stroke engine. | 26th Sep 1924 | Box 54 \ 4 Scan038 | |
| From RS to HS inquiring about the status of the Micklewood Two Stroke Engine. | 23th Apr 1925 | Box 54 \ 4 Scan039 | |
| Arranging the return of a loaned Micklewood 2-stroke engine to its owner after testing. | 27th Apr 1925 | Box 54 \ 4 Scan040 | |
| Despatch note for the return of a loaned 2-stroke engine after testing. | 28th Apr 1925 | Box 54 \ 4 Scan041 | |
| Letter detailing two engine faults observed during testing: a 'fade away' issue and comparatively low speed. | 27th Apr 1925 | Box 54 \ 4 Scan042 | |
| Letter discussing a new engine type for flying machines intended to supersede the present four-cycle type for high altitude operation. | 1st May 1925 | Box 54 \ 4 Scan043 | |
| Letter acknowledging the return of a Micklewood 2-stroke engine and advising a report will follow. | 1st May 1925 | Box 54 \ 4 Scan044 | |
| Letter to E.W. Hives regarding a broken piston found upon dismantling a recently received engine. | 9th May 1925 | Box 54 \ 4 Scan045 | |
| Letter to E.H. Micklewood regarding a failed engine experiment, advising that serious modifications are required. | 12th May 1925 | Box 54 \ 4 Scan046 | |
| Bench tests of a Micklewood 2-stroke engine, detailing its poor performance. | 25th Sep 1924 | Box 54 \ 4 Scan047 | |
| Analysing engine performance from indicator cards, focusing on compression, ignition, and external factors. | 25th Sep 1924 | Box 54 \ 4 Scan048 | |
| Page detailing issues with engine scavenging, exhaust valve design, and high fuel consumption. | 25th Sep 1924 | Box 54 \ 4 Scan049 | |
| Motoring tests analyzing engine frictional and pumping losses. | 25th Sep 1924 | Box 54 \ 4 Scan050 | |
| Analysing engine pumping losses, scavenging pressure, and potential improvements to valve timing and design. | 25th Sep 1924 | Box 54 \ 4 Scan051 | |
| Indicator diagrams for a Micklewood 2-stroke engine showing firing and motoring cycles against crank angle. | 25th Sep 1924 | Box 54 \ 4 Scan052 | |
| Performance analysis and specification sheet for the Micklewood 2-stroke engine. | 10th Sep 1922 | Box 54 \ 4 Scan053 | |
| Outline drawing of an ignition coil with multiple views and dimensions. | 10th Sep 1922 | Box 54 \ 4 Scan054 | |
| Technical memo on American battery ignition systems, discussing power consumption, reliability versus magnetos, and construction materials. | 18th Apr 1924 | Box 54 \ 4 Scan055 | |
| Poor longevity of platinum points in a car's electrical system and potential solutions. | 11th May 1925 | Box 54 \ 4 Scan056 | |
| Letter discussing a job vacancy and a technical patent for a nearly closed circuit coil. | 17th May 1925 | Box 54 \ 4 Scan057 | |
| Note about sending figures and an observation on Delco's practically closed circuit coil from the 1923 Show. | 19th May 1925 | Box 54 \ 4 Scan058 | |
| Request to obtain a patent specification for a 'Nearly Closed Iron Circuit Ignition Coil'. | 19th May 1925 | Box 54 \ 4 Scan059 | |
| Experiments on ignition coils to reduce energy output, considering alternative windings and a patent by the Lucas Company. | 20th May 1925 | Box 54 \ 4 Scan060 | |
| Continued discussion on the design and experimentation of a closed circuit iron core coil. | 20th May 1928 | Box 54 \ 4 Scan061 | |
| Instruction sheet detailing the design and electrical properties of a Delco coil, including a wiring diagram. | 2nd Nov 1925 | Box 54 \ 4 Scan062 | |
| Instruction sheet detailing the electrical properties and test results of a coil's primary and secondary windings. | 29th Jun 1920 | Box 54 \ 4 Scan063 | |
| Performance comparison between platinum and tungsten interrupter points, and English vs. American coils and condensers. | 11th Jun 1926 | Box 54 \ 4 Scan064 | |
| Technical note on the performance and testing of American Bosch and Delco coils and condensers. | 11th Jun 1926 | Box 54 \ 4 Scan065 | |
| Extract discussing Remy Ignition and the magnetic properties of coils. | 1st Jul 1926 | Box 54 \ 4 Scan066 | |
| Improvements and experiments related to battery ignition systems, contacts, and coils. | 9th Dec 1927 | Box 54 \ 4 Scan067 | |
| Advantages and disadvantages of two ignition coil designs, one with a reversed build order and one with a nearly closed iron circuit. | 19th Dec 1927 | Box 54 \ 4 Scan068 | |
| Description of the construction of a coil with an inside secondary and outside primary winding. | 1st Jan 1931 | Box 54 \ 4 Scan069 | |
| Extract from a memo discussing open vs. closed magnetic circuits for induction coils. | 1st Jan 1931 | Box 54 \ 4 Scan070 | |
| Agreeing to the manufacture of parts for the Kestrel Six-cylinder Unit. | 25th Jan 1933 | Box 54 \ 4 Scan071 | |
| The performance of the Kestrel Six Cylinder Unit, noting M.E.P., surging, and critical speed. | 25th Jan 1933 | Box 54 \ 4 Scan072 | |
| Performance graph showing the consumption loop for a Kestrel six-cylinder unit at 2250 RPM and full throttle. | 25th Jan 1933 | Box 54 \ 4 Scan073 | |
| Power curve graph for a Kestrel Six Cylinder Unit engine at full throttle. | 8th Mar 1933 | Box 54 \ 4 Scan074 | |
| Letter to the Air Ministry on Compression Ignition and a contract for running on Ethylene Glycol. | 8th Mar 1933 | Box 54 \ 4 Scan075 | |
| Contract with Mr. Tweedie for work on a 6-cylinder engine involving Ethylene Glycol. | 9th Mar 1933 | Box 54 \ 4 Scan076 | |
| Letter to the Air Ministry detailing results of engine cooling tests with Ethylene Glycol and proposing to move from single to six-cylinder unit tests. | 11th Mar 1933 | Box 54 \ 4 Scan077 | |
| Proposed 50-hour test programme for the Kestrel six-cylinder engine, focusing on high-temperature and evaporative cooling systems. | 11th Mar 1933 | Box 54 \ 4 Scan078 | |
| Proposals for engine performance tests using undiluted Glycol and high outlet temperatures. | 11th Mar 1933 | Box 54 \ 4 Scan079 | |
| Comparison of radiator sizes required on the 'Fury' aircraft, contrasting water and ethylene glycol coolants at 12,000 ft. | 13th Mar 1933 | Box 54 \ 4 Scan080 | |
| Programme for 50 hours of research on a 6-cylinder unit using Ethylene Glycol. | 13th Mar 1933 | Box 54 \ 4 Scan081 | |
| Forwarding a document regarding tests on Ethylene Glycol in a 6-cylinder unit. | 15th Mar 1933 | Box 54 \ 4 Scan082 | |
| Approval for 50 hours' development testing on a 6-cylinder 'Kestrel' unit with ethylene glycol. | 5th Apr 1933 | Box 54 \ 4 Scan083 | |
| The condition of a Kestrel Six Cylinder Unit after an eight-hour, non-stop, glycol-cooled run. | 26th Apr 1933 | Box 54 \ 4 Scan084 | |
| Chasing a completion date for the water supply for a six-cylinder test unit. | 3rd Jun 1933 | Box 54 \ 4 Scan085 | |
| Water supply for a Six Cylinder Unit, confirming instructions have been given and material ordered. | 12th Jun 1933 | Box 54 \ 4 Scan086 | |
| Works order for 50 hours of research running on a Kestrel 6 cylinder unit with Ethylene Glycol cooling. | 16th Jun 1933 | Box 54 \ 4 Scan087 | |
| Works order for the Air Ministry detailing the required structure and content of a final report. | 16th Jun 1933 | Box 54 \ 4 Scan088 | |
| Test report on the effects of high water flow and low jacket temperatures on detonation in a Kestrel six-cylinder engine unit. | 20th Jul 1935 | Box 54 \ 4 Scan089 | |
| Conclusions of engine detonation tests, its effects on joint rings, and proposed future development. | 20th Jul 1933 | Box 54 \ 4 Scan090 | |
| Blueprint illustrating the effects of detonation on a Kestrel engine cylinder joint ring. | 19th Jul 1933 | Box 54 \ 4 Scan091 | |
| Photograph of a six-cylinder, four-valve-per-cylinder engine cylinder head on a stand. | 19th Jul 1933 | Box 54 \ 4 Scan092 | |
| Close-up photograph of an engine cylinder head showing the valves. | 1st Aug 1933 | Box 54 \ 4 Scan093 | |
| Instructions to modernise the Kestrel Six Cylinder Unit No.1. | 1st Aug 1933 | Box 54 \ 4 Scan094 | |
| From H.S. Royce requesting a spare Goshawk block for a Kestrel Six Cylinder No.2 engine with specific valve requirements. | 1st Aug 1933 | Box 54 \ 4 Scan095 | |
| Test results of running Kestrel single and six-cylinder units with Helmore treated oils. | 2nd Aug 1933 | Box 54 \ 4 Scan096 | |
| Experiment using metallic lead in oil to reduce carbon deposits on a piston crown, with plans for further development. | 2nd Aug 1933 | Box 54 \ 4 Scan097 | |
| Test report on lead separation from the centre main bearing of a Kestrel six-cylinder unit. | 5th Aug 1933 | Box 54 \ 4 Scan098 | |
| Instructions for fitting a 6-cylinder Kestrel engine with a custom induction manifold and a specific carburetter type. | 26th Sep 1932 | Box 54 \ 4 Scan099 | |
| Urgent memorandum regarding modifications to the transmission coupling and brake capacity on the Kestrel 6 cylinder unit. | 20th Dec 1933 | Box 54 \ 4 Scan100 | |
| Confirming the completion of a research contract on a six-cylinder unit following an amendment from the Air Ministry. | 9th Feb 1934 | Box 54 \ 4 Scan101 | |
| Confirmation to fit a standard Kestrel cylinder block to a six-cylinder unit, with no top joint rings. | 26th Feb 1934 | Box 54 \ 4 Scan102 | |
| Cylinder head temperatures, comparing Glycol and water cooling on a Kestrel Six Cylinder engine. | 3rd Aug 1934 | Box 54 \ 4 Scan103 | |
| The effect of different coolants upon the cylinder head temperature of a Kestrel six-cylinder engine unit. | 9th Aug 1934 | Box 54 \ 4 Scan104 | |
| Findings from tests comparing Glycol and water as engine coolants, noting temperature issues, flow reduction, and plans for further development. | 9th Aug 1934 | Box 54 \ 4 Scan105 | |
| Graph showing the effect of coolant type and inlet temperature on the cylinder head temperature for a Kestrel six-cylinder unit. | 2nd Aug 1934 | Box 54 \ 4 Scan106 | |
| Graph showing the effect of coolant on cylinder head temperature for a Kestrel Six Cylinder Unit. | 1st Aug 1934 | Box 54 \ 4 Scan107 | |
| Graph showing the effect of coolant inlet temperature on the cylinder head temperature for a Kestrel six-cylinder unit. | 1st Aug 1934 | Box 54 \ 4 Scan108 | |
| Sketch showing the position of thermocouples in a Kestrel six-cylinder unit block. | 1st Aug 1934 | Box 54 \ 4 Scan109 | |
| Performance chart comparing water and glycol coolant on a Kestrel six-cylinder engine unit. | 2nd Aug 1934 | Box 54 \ 4 Scan110 | |
| Specification sheet for a Kestrel 6-Cylinder Unit, listing component part numbers. | 26th Jan 1933 | Box 54 \ 4 Scan111 | |
| Typed list of engine components and their corresponding part numbers, page 2. | 26th Jan 1933 | Box 54 \ 4 Scan112 | |
| List of engine components with associated part numbers and specifications for an engine. | 26th Jan 1933 | Box 54 \ 4 Scan113 | |
| List of specifications for carburetter, controls, petrol pump, and direct drive components. | 26th Jan 1933 | Box 54 \ 4 Scan114 | |
| Specification revision for a Kestrel 6-Cylinder Unit detailing changes to the Magneto Driving Gear after test bed work. | 27th Jan 1933 | Box 54 \ 4 Scan115 | |
| Specification revision for the Kestrel 6 Cylinder Unit, detailing changes to pistons and cylinders. | 24th May 1933 | Box 54 \ 4 Scan116 | |
| Specification revision for a Kestrel 6 Cylinder Unit's water connections. | 24th May 1933 | Box 54 \ 4 Scan117 | |
| Revised specification for a Kestrel 6 Cylinder Unit, detailing the components of the Flywheel assembly. | 24th May 1933 | Box 54 \ 4 Scan118 | |
| Specification revision for Kestrel FS 6 Cylinder Unit No.1, detailing changes to pistons and valves. | 4th Nov 1933 | Box 54 \ 4 Scan119 | |
| Specification revision document comparing previous and revised parts for various engine components. | 4th Nov 1933 | Box 54 \ 4 Scan120 | |
| Comparison of previous and revised specifications for various engine parts. | 4th Nov 1933 | Box 54 \ 4 Scan121 | |
| Comparison sheet detailing previous and revised specifications for various engine components. | 4th Nov 1933 | Box 54 \ 4 Scan122 | |
| Revised specification for a Direct Drive F.10 Type, incorporating a strengthened driving flange. | 4th Nov 1933 | Box 54 \ 4 Scan123 | |
| Specification revision for a Kestrel FS. 6 Cylinder Unit No.1, detailing the components fitted. | 18th Nov 1933 | Box 54 \ 4 Scan124 | |
| List of engine components and their corresponding List of Operations (LOP) numbers and status. | 18th Nov 1933 | Box 54 \ 4 Scan125 | |
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