| Description | Date | Identifier | |
| Blueprint for modifications to the Kestrel engine's slow running system. | 20th Oct 1932 | Box 179b \ 2 img035 | |
| The unsatisfactory performance of austenitic nitrided steel liners in single cylinder units. | 19th Oct 1932 | Box 179b \ 2 img036 | |
| The production and testing of nitrided austenitic steel Kestrel cylinder liners, detailing issues with hardening and distortion. | 1st Oct 1932 | Box 179b \ 2 img037 | |
| Drawing and measurement data for a Kestrel single cylinder liner made from austenitic steel after running tests. | 26th Sep 1932 | Box 179b \ 2 img038 | |
| Engine test of austenitic liners, detailing issues of scoring and distortion. | 13th Oct 1932 | Box 179b \ 2 img039 | |
| Complaint about irritating rattles in 'Peregrine' bodies caused by doors, windows, and other fittings. | 19th Oct 1932 | Box 179b \ 2 img040 | |
| Tests conducted on hardened and white metal splines for a Peregrine propeller shaft. | 24th Oct 1932 | Box 179b \ 2 img041 | |
| Graph plotting Sliding Effort in pounds against Torque in pound-feet for a Peregrine Prop Shaft with hardened splines. | 8th Oct 1932 | Box 179b \ 2 img042 | |
| Graph plotting sliding effort against torque for a Peregrine propeller shaft with white-metalled splines. | 18th Oct 1932 | Box 179b \ 2 img043 | |
| Technical summary of the Griffon engine, its features, specifications, and performance test results. | 28th Oct 1932 | Box 179b \ 2 img044 | |
| Analysis of engine tests focusing on excessive oil consumption, temperature, and frothing at various RPMs. | 29th Oct 1932 | Box 179b \ 2 img045 | |
| Analysis of excessive oil consumption and temperature in the Griffon engine, with comparisons to the Buzzard engine. | 28th Oct 1932 | Box 179b \ 2 img046 | |
| Comparison of the Griffon and Buzzard engines regarding weight, power-to-weight ratio, and supercharger installation. | 28th Oct 1932 | Box 179b \ 2 img047 | |
| Full throttle power curve for a Griffon modified supercharged engine. | 25th Oct 1932 | Box 179b \ 2 img048 | |
| Graph showing full throttle consumption loops for a Griffon engine at alternative normal speeds. | 28th Oct 1932 | Box 179b \ 2 img049 | |
| Scale sketch showing the comparative external size of Griffon and Buzzard engines. | 19th Oct 1932 | Box 179b \ 2 img050 | |
| Blueprint comparing the front outline of the Griffon engine (full lines) with the Buzzard engine (dotted lines). | 19th Oct 1932 | Box 179b \ 2 img051 | |
| Photograph of a Buzzard engine. | 19th Oct 1932 | Box 179b \ 2 img052 | |
| Photograph showing a side view of a Griffon engine. | 31th Oct 1932 | Box 179b \ 2 img053 | |
| The failure of a 3rd motion shaft in a gearbox, and a proposal for a design alteration. | 31th Oct 1932 | Box 179b \ 2 img054 | |
| Photograph of a two-part splined shaft or sleeve assembly. | 28th Oct 1932 | Box 179b \ 2 img055 | |
| Blueprint showing a cross-section and dimensions for a 3rd Motion Shaft. | 28th Oct 1932 | Box 179b \ 2 img056 | |
| Investigation into the inefficiency of Peregrine brakes and recommendations for improvement. | 2nd Nov 1932 | Box 179b \ 2 img057 | |
| Comparison table of servo and brake particulars for different car models. | 3rd Nov 1932 | Box 179b \ 2 img058 | |
| The Peregrine engine's oil temperature during a run from Derby to London. | 3rd Nov 1932 | Box 179b \ 2 img059 | |
| On the general position of the 'Peregrine' car, detailing its use as a test car and outlining outstanding problems. | 7th Nov 1932 | Box 179b \ 2 img060 | |
| Specifications for the first Peregrine test car, primarily for mileage experience. | 9th Nov 1935 | Box 179b \ 2 img061 | |
| List of chassis specifications and modifications based on initial vehicle testing. | 9th Nov 1935 | Box 179b \ 2 img062 | |
| List of improvements relating to the clutch, braking, carburettor, and exhaust system. | 8th Nov 1932 | Box 179b \ 2 img063 | |
| Technical memo regarding the development and difficulties of the R.R. Semi Expanding Carburetter. | 8th Nov 1932 | Box 179b \ 2 img064 | |
| Engine efficiency, carburetter control, and starting procedures. | 8th Nov 1932 | Box 179b \ 2 img065 | |
| Development and production strategy for the 'Bensport' car. | 8th Nov 1932 | Box 179b \ 2 img066 | |
| Comparing the Bensport car's performance against a Ford, discussing the suitability of the J.1 engine, and outlining future engine development work. | 8th Nov 1932 | Box 179b \ 2 img067 | |
| Proposal outlining alterations to the Peregrine brake system to improve braking and reduce servo load. | 9th Nov 1932 | Box 179b \ 2 img068 | |
| Modifications to the servo braking system to reduce pressure and heat. | 2nd Nov 1932 | Box 179b \ 2 img069 | |
| Diagram outlining modifications to the Peregrine brake system. | 9th Nov 1932 | Box 179b \ 2 img070 | |
| Test report comparing the performance of a Goshawk I blower fitted to a Kestrel engine. | 9th Nov 1932 | Box 179b \ 2 img071 | |
| Engine performance, boost settings, and Goshawk I carburation development, with comparisons to other engines. | 9th Nov 1932 | Box 179b \ 2 img072 | |
| Carburettor and engine component redesigns and performance summaries. | 9th Nov 1932 | Box 179b \ 2 img073 | |
| Concluding that further carburetter development requires experience from flight tests. | 9th Nov 1932 | Box 179b \ 2 img074 | |
| Comparative power curves for a K.IV supercharger on Kestrel 15 and 27 engines. | 9th Nov 1932 | Box 179b \ 2 img075 | |
| Graph of constant speed varying boost curves for a KES.S.18 engine with a KES IV blower. | 9th Nov 1932 | Box 179b \ 2 img076 | |
| Graph plotting Power & Boost against Altitude for a Kestrel IV Blower on a standard engine. | 8th Aug 1923 | Box 179b \ 2 img077 | |
| Ground level power curves for a Kestrel B blower on a standard engine, showing two separate tests. | 8th Aug 1923 | Box 179b \ 2 img078 | |
| Graph showing Standard Kestrel engine power at various altitudes, plotting corrected brake horse power against altitude in feet. | 8th Aug 1923 | Box 179b \ 2 img079 | |
| Graph showing the ground level power of a 1932 standard Kestrel S engine at varying boost pressures and RPMs. | 8th Aug 1923 | Box 179b \ 2 img080 | |
| Graph comparing the altitude performance curves of Kestrel IV, Pegasus, Panther, and Mercury IV engines. | 8th Aug 1923 | Box 179b \ 2 img081 | |
| Performance graph comparing various power ratings for a Kestrel engine with a Kestrel IV blower at different altitudes. | 11th Jan 1932 | Box 179b \ 2 img082 | |
| Graph showing altitude power curves for a KES IV blower on a standard Kestrel engine with suggested type test ratings. | 11th Jan 1932 | Box 179b \ 2 img083 | |
| Graph of altitude power curves comparing a Goshawk I blower on a standard Kestrel with a standard 1932 Kestrel S engine. | 10th Nov 1932 | Box 179b \ 2 img084 | |
| Steering improvements for the 'Spectre' model by comparing American, Hispano, and Dubonnet systems. | 10th Nov 1932 | Box 179b \ 2 img085 | |
| Continued report discussing braking, suspension systems, and riding comfort with references to Dubonnet and Lancia cars. | 10th Nov 1932 | Box 179b \ 2 img086 | |
| On aero engine performance, suggesting an increase in HP rating to maintain a competitive advantage for water-cooled engines. | 11th Nov 1932 | Box 179b \ 2 img087 | |
| Engine faults related to cylinder construction and proposing a two-piece block design for testing. | 11th Nov 1932 | Box 179b \ 2 img088 | |
| Engine bearing performance, the development of Kelmet bearings, and the decision to retain the current forged connecting rod design. | 11th Nov 1932 | Box 179b \ 2 img089 | |
| Engine improvements, focusing on Kestrel development, hardened crankshafts, and the .475 reduction gear. | 11th Nov 1932 | Box 179b \ 2 img090 | |
| Three problems encountered with the J.III shock damper and conical valve arrangement. | 11th Nov 1932 | Box 179b \ 2 img091 | |
| Tests and modifications on vents, dampers, and governor control systems, including notes on oil piping and pressure. | 11th Nov 1932 | Box 179b \ 2 img092 | |
| Damper and governor control tests, discussing load, oil viscosity, and valve performance with a table of results. | 11th Nov 1932 | Box 179b \ 2 img093 | |
| Brief note on the effectiveness of certain capots and clips, and the need to improve dampers for high speed and comfort. | 25th Apr 1924 | Box 179b \ 2 img094 | |
| Car in France detailing its latest simplified split pistons and effective dampers. | 1st Jan 1914 | Box 179b \ 2 img095 | |
| Three performance graphs for a J.III Rear component under varying pressure and temperature conditions. | 18th Oct 1932 | Box 179b \ 2 img096 | |
| Performance graphs for J III Rear component under various pressure, temperature, and run conditions. | 18th Oct 1932 | Box 179b \ 2 img097 | |
| Three indicator diagrams showing performance of a 2-stroke low-pressure system at various temperatures and RPMs. | 18th Oct 1932 | Box 179b \ 2 img098 | |
| Three performance graphs for a 90/90 lb 2-inch stroke low-pressure engine under various temperature conditions. | 18th Oct 1932 | Box 179b \ 2 img099 | |
| Six indicator diagrams comparing performance at high and low pressure with different vent configurations. | 18th Oct 1932 | Box 179b \ 2 img100 | |
| Four graphs showing governor pipe pressure characteristics under various conditions. | 17th Oct 1932 | Box 179b \ 2 img101 | |
| Set of four performance diagrams for governor pipes under varying high-pressure conditions. | 17th Oct 1932 | Box 179b \ 2 img102 | |
| Series of three performance graphs showing pressure and stroke data under varying conditions. | 18th Oct 1932 | Box 179b \ 2 img103 | |
| Blueprint detailing a modification for air vent grooves in a piston. | 26th Oct 1938 | Box 179b \ 2 img104 | |
| Graph showing the time of efflux for various oils and fluids from a Redwood No 1 Viscometer at different temperatures. | 14th Nov 1938 | Box 179b \ 2 img105 | |
| Development report on the Peregrine power unit, detailing issues with mechanical reliability, lubrication, and the crankshaft damper. | 14th Nov 1938 | Box 179b \ 2 img106 | |
| The performance of 14 M.M. plugs, a semi-expanding carburetter, pistons, and a turbulent head. | 14th Nov 1932 | Box 179b \ 2 img107 | |
| Camshaft performance and general power improvements for the Peregrine engine. | 14th Nov 1938 | Box 179b \ 2 img108 | |
| Photograph of a poppet valve and what appears to be a valve guide. | 4th Oct 1932 | Box 179b \ 2 img109 | |
| Performance graph comparing stiff and flexible pistons on a Peregrine engine. | 4th Oct 1932 | Box 179b \ 2 img110 | |
| Performance graph comparing S.U. and R.R. carburettors, plotting Brake Horsepower (BHP) against Revolutions Per Minute (RPM). | 4th Oct 1932 | Box 179b \ 2 img111 | |
| Performance graph detailing engine characteristics with a specific camshaft, head configuration, and open exhaust. | 4th Oct 1932 | Box 179b \ 2 img112 | |
| Graph comparing the performance of S.U. and R.R. carburettors. | 4th Oct 1932 | Box 179b \ 2 img113 | |
| Performance graph comparing turbulent and standard cylinder heads on a camshaft with small inlet valves. | 4th Oct 1932 | Box 179b \ 2 img114 | |
| Performance graph for the Peregrine engine with a turbulent head and open exhaust, showing B.M.E.P and Induction Depression. | 4th Oct 1932 | Box 179b \ 2 img115 | |
| Graph comparing the performance of three different Peregrine engine cylinder head configurations. | 4th Oct 1932 | Box 179b \ 2 img116 | |
| Performance graph comparing low-speed power outputs for different engine configurations and timings. | 4th Oct 1932 | Box 179b \ 2 img117 | |
| Graph comparing power output using a 114° camshaft with a 5.25 compression ratio across four different carburetter configurations. | 4th Oct 1932 | Box 179b \ 2 img118 | |
| Engine performance graph showing Brake Horsepower (BHP) and Brake Mean Effective Pressure (B.M.E.P.) against Revolutions Per Minute (R.P.M.). | 15th Nov 1932 | Box 179b \ 2 img119 | |
| Report comparing aero engine capacities against competitors and suggesting the need to anticipate a larger engine model. | 15th Nov 1932 | Box 179b \ 2 img120 | |
| Options for increasing engine capacity and performance at altitude. | 15th Nov 1932 | Box 179b \ 2 img121 | |
| Page 2 of a memo regarding weight estimation for Kestrel and Buzzard engines. | 15th Nov 1932 | Box 179b \ 2 img122 | |
| List of engine capacities in cubic inches for various aircraft engine manufacturers. | 16th Nov 1932 | Box 179b \ 2 img123 | |
| Cover letter correcting a report reference regarding the increased rating of Kestrel B. Type engines. | 16th Nov 1932 | Box 179b \ 2 img124 | |
| Increased power ratings for the Kestrel B. Type engine. | 16th Nov 1932 | Box 179b \ 2 img125 | |
| Cover note for a report on a special category test of engine 119 at an increased rating. | 16th Nov 1932 | Box 179b \ 2 img126 | |
| Revised calculations and modifications for the Peregrine starter motor. | 17th Nov 1932 | Box 179b \ 2 img127 | |
| Technical calculations for the Peregrine starter motor with a 4' carcase. | 12th Nov 1932 | Box 179b \ 2 img128 | |
| Calculation sheet for electrical motor resistance and conductor dimensions. | 12th Nov 1932 | Box 179b \ 2 img129 | |
| Table of flux density values for various electrical motor or generator components. | 12th Nov 1932 | Box 179b \ 2 img130 | |
| Performance characteristic graph for a motor with five Y-axes. | 12th Nov 1932 | Box 179b \ 2 img131 | |
| Graph showing starter motor test curves for the Peregrine engine. | 18th Nov 1932 | Box 179b \ 2 img132 | |
| Request for up-to-date specifications regarding chassis modifications for Bensport bodies. | 18th Nov 1932 | Box 179b \ 2 img133 | |
| The testing of DES. 1613 cylinders on Goshawk and Kestrel engines. | 19th Nov 1932 | Box 179b \ 2 img134 | |
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