| Description | Date | Identifier | |
| Engine test report detailing performance characteristics including compression, detonation, vibration, and valve clearances. | 1st Aug 1921 | Box 180 \ M1 \ 1 img003 | |
| Cylinder block extension, valve timing with different tappet clearances, and water pump flow rate tests. | 4th Aug 1921 | Box 180 \ M1 \ 1 img004 | |
| Test report on engine oil pump performance, lubrication, and carburation. | 6th Aug 1921 | Box 180 \ M1 \ 1 img005 | |
| Weak clutch unable to hold torque and a quiet, oil-retaining gearbox. | 1st Aug 1921 | Box 180 \ M1 \ 1 img006 | |
| Criticisms on the Goshawk 11 engine regarding the over-elasticity of its cylinder head studs. | 8th Aug 1921 | Box 180 \ M1 \ 1 img007 | |
| Design and manufacturing issues with studs, cylinder water jacket tubes, and countersunk screws. | 1st Aug 1921 | Box 180 \ M1 \ 1 img008 | |
| Recommendations for improvements to the engine casing and flywheel casing, including waterproofing and preventing dropped parts. | 1st Aug 1921 | Box 180 \ M1 \ 1 img009 | |
| Letter discussing criticisms and design aspects of the Goshawk II engine, specifically regarding studs and water jackets. | 8th Aug 1921 | Box 180 \ M1 \ 1 img010 | |
| Technical memo discussing design points for countersunk screws, flywheel casing, clutch trunnion, and spring drive. | 8th Aug 1921 | Box 180 \ M1 \ 1 img011 | |
| Design considerations for a spring drive, pipes, oil pump, engine suspension, and carburetor. | 8th Aug 1921 | Box 180 \ M1 \ 1 img012 | |
| Design and features of an oil level indicator, oil filter, inspection cover, and core plugs. | 8th Aug 1921 | Box 180 \ M1 \ 1 img013 | |
| Test runs of the Goshawk 11 engine, detailing issues with the clutch trunnion and concerns about cylinder studs. | 11th Aug 1921 | Box 180 \ M1 \ 1 img014 | |
| Horsepower tests to measure power loss from heating the induction pipe, and progress on swaging cylinder tubes. | 11th Aug 1921 | Box 180 \ M1 \ 1 img015 | |
| Cracked exhaust pipe, carburetter flooding, and engine performance with a paraffin mixture. | 15th Aug 1921 | Box 180 \ M1 \ 1 img016 | |
| The post-test dismantling and examination of a Goshawk 11 engine and a Goshawk 11 universal joint. | 15th Aug 1921 | Box 180 \ M1 \ 1 img017 | |
| Continuation of a memo regarding an engine oil leak and the use of paper washers as a fix. | 15th Aug 1921 | Box 180 \ M1 \ 1 img018 | |
| Comparing tyre sizes (32 x 4½ vs 820 x 120) and their effect on vehicle ground clearance for the 40/50 HP model. | 19th Aug 1921 | Box 180 \ M1 \ 1 img019 | |
| The Goshawk 11 engine, detailing further testing on pistons, clutch performance, and wheel/tyre specifications. | 19th Aug 1921 | Box 180 \ M1 \ 1 img020 | |
| Use of 20° angle teeth versus standard teeth in the Goshawk II gear box. | 1st Jan 1921 | Box 180 \ M1 \ 1 img021 | |
| Test report on the Goshawk 11 chassis, detailing noise issues and proposed modifications to reduce them. | 1st Sep 1921 | Box 180 \ M1 \ 1 img022 | |
| Axle noise, crankshaft vibration, and clutch issues including plate buckling and disengagement. | 1st Sep 1921 | Box 180 \ M1 \ 1 img023 | |
| Advantages of a Mack Truck clutch design and a proposal for a new clutch fabric. | 1st Sep 1921 | Box 180 \ M1 \ 1 img024 | |
| With a diagram, proposing a 'silencer within a silencer' design to reduce a tinny noise in the exhaust. | 1st Sep 1921 | Box 180 \ M1 \ 1 img025 | |
| Query regarding necessary equipment for dynamos and motors from outside manufacturers for the 'Goshawk II'. | 19th Aug 1921 | Box 180 \ M1 \ 1 img026 | |
| The features of the non-trembler battery ignition system for the Goshawk II engine. | 1st Aug 1921 | Box 180 \ M1 \ 1 img027 | |
| Continued memo from R. to Mr. Walker discussing features of an engine ignition system. | 1st Aug 1921 | Box 180 \ M1 \ 1 img028 | |
| Confirmation of a telegram regarding a meeting and gears for a Goshawk two gear box. | 31th Aug 1921 | Box 180 \ M1 \ 1 img029 | |
| Status report on dynamos and starter motors from various suppliers for the 'Goshawk II' project. | 19th Aug 1921 | Box 180 \ M1 \ 1 img030 | |
| Design and features of the 'Goshawk II' open body. | 19th Jul 1921 | Box 180 \ M1 \ 1 img031 | |
| The lack of an oil filler plug and the method for checking oil level on the Goshawk II gearbox. | 1st Jul 1921 | Box 180 \ M1 \ 1 img032 | |
| The first test run of the Goshawk 11 engine and gearbox units. | 22th Jul 1921 | Box 180 \ M1 \ 1 img033 | |
| Initial test bench report on the Goshawk 11 engine and its gear units. | 22th Jul 1921 | Box 180 \ M1 \ 1 img034 | |
| The testing of the second Goshawk II engine and gearbox unit, detailing oil leak issues. | 8th Aug 1921 | Box 180 \ M1 \ 1 img035 | |
| The performance and running costs of straight-sided cord tyres following post-war complaints. | 1st Jun 1921 | Box 180 \ M1 \ 1 img036 | |
| Evolution of suspension design, comparing spring types and the necessity of increased damping friction due to changes in tyre construction. | 21th Jun 1921 | Box 180 \ M1 \ 1 img037 | |
| Universal adoption of straight-sided cord tyres and their performance on the 'Goshawk' experimental car. | 22th Jun 1921 | Box 180 \ M1 \ 1 img038 | |
| Conveying Mr. Royce's request for particulars and expressing concerns about the Goshawk II dynamo and motor project. | 1st Jun 1921 | Box 180 \ M1 \ 1 img039 | |
| Continued memo regarding a modification to prevent oil soak-through, and details on a suitable Autovac Tank. | 1st Aug 1921 | Box 180 \ M1 \ 1 img040 | |
| Road test report on the 'Goshawk' 11 chassis (X4219), comparing its performance to the 40/50 HP model. | 29th Aug 1921 | Box 180 \ M1 \ 1 img041 | |
| Test report on a car chassis, detailing issues with the gearbox, rear axle, universal joint, and carburettor, and plans for further review. | 29th Aug 1921 | Box 180 \ M1 \ 1 img042 | |
| Test bench finding on the cause of oil leakage from a universal joint. | 1st Aug 1921 | Box 180 \ M1 \ 1 img043 | |
| The Goshawk 11 chassis, detailing issues with the dashboard, controls, and various fittings, with suggestions for improvement. | 30th Aug 1921 | Box 180 \ M1 \ 1 img044 | |
| Request to the Experimental Department to create a dummy wooden model armature for the 'Goshawk II' motor and dynamo. | 10th Aug 1921 | Box 180 \ M1 \ 1 img045 | |
| The specifications and wiring for 'Goshawk II' lamps. | 13th Aug 1921 | Box 180 \ M1 \ 1 img046 | |
| From 'E.' to 'H.S.' responding to a list of points requiring attention on the 'Goshawk II' engine. | 26th Aug 1921 | Box 180 \ M1 \ 1 img047 | |
| List of complaints regarding a vehicle chassis and other components, with corresponding handwritten remarks and actions. | 26th Aug 1921 | Box 180 \ M1 \ 1 img049 | |
| Test report on the Goshawk 11 rear brakes, detailing dynamometer performance, failure of aluminium shoes, and material comparison. | 1st Oct 1921 | Box 180 \ M1 \ 1 img050 | |
| Testing a noisy Hyatt Roller Bearing and the policy of modifying parts based on the practice of the 40/50 HP model. | 1st Oct 1921 | Box 180 \ M1 \ 1 img051 | |
| Cracked induction pipe on Goshawk 11 and performance improvements after repair. | 8th Sep 1921 | Box 180 \ M1 \ 1 img052 | |
| Improvements and issues with the Goshawk II chassis, focusing on the direct drive clutch and clutch plate. | 14th Sep 1921 | Box 180 \ M1 \ 1 img053 | |
| Alternative clutch designs, materials, and testing suggestions. | 1st Sep 1921 | Box 180 \ M1 \ 1 img054 | |
| Modifications to the 'Goshawk II' carburettor and addressing a cracked induction pipe. | 12th Sep 1921 | Box 180 \ M1 \ 1 img055 | |
| Internal memorandum discussing component changes and design updates for a vehicle. | 1st Sep 1921 | Box 180 \ M1 \ 1 img056 | |
| Modifications to the springs, exhaust system, fan, and undershield of American cars. | 14th Sep 1921 | Box 180 \ M1 \ 1 img057 | |
| Delco starter switch, its carbon and copper contacts, and a recommendation for an alternative for the Goshawk II. | 15th Sep 1921 | Box 180 \ M1 \ 1 img058 | |
| From E. to H.S. conveying Mr. Royce's query on evidence for Delco starter switch failures. | 15th Sep 1921 | Box 180 \ M1 \ 1 img059 | |
| The failure of a carbon copper type starter switch and the recommendation for a more reliable plain switch. | 15th Sep 1921 | Box 180 \ M1 \ 1 img060 | |
| Experiments on the Goshawk 11 crankshaft friction damper to reduce engine noise and vibration. | 15th Sep 1921 | Box 180 \ M1 \ 1 img061 | |
| Letter discussing the state of drawings for the 'Goshawk II' control mechanism. | 20th Sep 1921 | Box 180 \ M1 \ 1 img062 | |
| Technical memorandum detailing tests and proposed modifications for the Goshawk 11 engine components. | 9th Sep 1921 | Box 180 \ M1 \ 1 img063 | |
| Issues with jack pads, brake drums, and induction/exhaust pipes for the Coshamk 11 (X4219). | 27th Sep 1921 | Box 180 \ M1 \ 1 img064 | |
| Investigation into a roaring noise from the Goshawk II engine's induction system by comparing it with a 40/50 HP chassis. | 30th Sep 1921 | Box 180 \ M1 \ 1 img065 | |
| Report comparing the Goshawk 11 car to the 40/50 model on gearbox noise and ride comfort, while also considering market competitors. | 1st Sep 1921 | Box 180 \ M1 \ 1 img066 | |
| Responding to a telegram about the required Slipper Wheel diameter for the Goshawk 11, pending tests with heavier cast iron pistons. | 1st Oct 1921 | Box 180 \ M1 \ 1 img067 | |
| Dispatching drawing Lec.1458 showing the spring drive, slipper flywheel, and temporary wheelcase for the Goshawk II engine. | 21th Oct 1921 | Box 180 \ M1 \ 1 img068 | |
| Investigation into the cause of a 'power roar' from the Goshawk 11 induction system. | 1st Oct 1921 | Box 180 \ M1 \ 1 img069 | |
| Issues and recommendations for a vehicle's clutch, petrol tap, wiring, and rear axle oil filler. | 1st Oct 1921 | Box 180 \ M1 \ 1 img070 | |
| On design improvements, covering filler accessibility, adding a rear valance, and universal joint lubrication issues. | 10th Oct 1921 | Box 180 \ M1 \ 1 img071 | |
| The Goshawk 11 carburetter's slow running issues and the advantages of a piston-type throttle. | 1st Oct 1921 | Box 180 \ M1 \ 1 img072 | |
| Modified induction pipe design (Lec.1459) for the Goshawk II engine. | 1st Oct 1921 | Box 180 \ M1 \ 1 img073 | |
| The challenges of fitting rear shock dampers and the development of a new design for the 'Goshawk II' experimental chassis. | 8th Oct 1921 | Box 180 \ M1 \ 1 img074 | |
| Investigation into the cause of a roaring noise in the Goshawk engine's induction system. | 10th Oct 1921 | Box 180 \ M1 \ 1 img075 | |
| Gearbox, steering, and induction roar tests. | 13th Oct 1921 | Box 180 \ M1 \ 1 img076 | |
| Troubleshooting issues with a Lucas Starter Motor's Bendix Pinion failing to disengage on a Goshawk 11 engine. | 1st Oct 1921 | Box 180 \ M1 \ 1 img077 | |
| Goshawk 11 engine issues, specifically induction roar and starter motor pinion engagement. | 14th Oct 1921 | Box 180 \ M1 \ 1 img078 | |
| Proposed alterations to the 'GOSHAWK II' carburettor, including the addition of a silencer and changes to the controls. | 11th Oct 1921 | Box 180 \ M1 \ 1 img079 | |
| From R. to H.S. regarding the hope for a simpler scheme. | 1st Oct 1921 | Box 180 \ M1 \ 1 img080 | |
| Brake casting material failures and potential alternatives following a test. | 11th Oct 1921 | Box 180 \ M1 \ 1 img081 | |
| Selection of material for 'Goshawk II' frames. | 10th Oct 1921 | Box 180 \ M1 \ 1 img082 | |
| The Goshawk II's electrical equipment, discussing dynamo options and a proposed oil-immersed starter switch. | 1st Oct 1921 | Box 180 \ M1 \ 1 img083 | |
| Modifications to the Goshawk II carburettor scheme based on Mr. Royce's instructions. | 17th Oct 1921 | Box 180 \ M1 \ 1 img084 | |
| Technical memorandum regarding the Goshawk II engine, discussing the gearbox, crankshaft damper, and the use of aluminium pistons. | 1st Oct 1921 | Box 180 \ M1 \ 1 img085 | |
| Radiator appearance, clutch shudder, and starter motor. | 17th Oct 1921 | Box 180 \ M1 \ 1 img086 | |
| From R. to H.S. discussing the pitch of threads and options for making a drive more silent. | 20th Oct 1921 | Box 180 \ M1 \ 1 img087 | |
| Failures observed during a bump test on a Goshawk 11 chassis, specifically concerning the front springs, spring clips, and a steering lever. | 1st Oct 1931 | Box 180 \ M1 \ 1 img088 | |
| Design issues and requirements for the Goshawk 11 chassis and components. | 26th Oct 1921 | Box 180 \ M1 \ 1 img089 | |
| Recommendation to have designs available for fitting wire wheels, noting this may require serious alterations to the front axle or pivots. | 27th Oct 1921 | Box 180 \ M1 \ 1 img090 | |
| Potential failure in the Goshawk 11 gearbox due to impractical 2.BA bolts. | 26th Oct 1921 | Box 180 \ M1 \ 1 img091 | |
| Cause of intake noise in the Goshawk II engine and proposing modifications to resolve it. | 27th Oct 1921 | Box 180 \ M1 \ 1 img092 | |
| Engine vibration, balance, and improvements to various components including pistons, ignition, brakes, and carburettor. | 1st Oct 1921 | Box 180 \ M1 \ 1 img093 | |
| Alterations to the ignition advance specifications for the Goshawk II engine. | 31th Oct 1921 | Box 180 \ M1 \ 1 img094 | |
| Parts failures following a 20-hour bumper rig test on the Goshawk 11 chassis. | 26th Oct 1921 | Box 180 \ M1 \ 1 img095 | |
| Summary table of a bumper test on a Goshawk II chassis, detailing component failure times in hours. | 26th Oct 1921 | Box 180 \ M1 \ 1 img096 | |
| Design of the Bendix Pinion, comparing its bearing and thrust design to American cars. | 28th Oct 1921 | Box 180 \ M1 \ 1 img097 | |
| Modifications to the Goshawk II silencer for carburettor and control gear. | 29th Oct 1921 | Box 180 \ M1 \ 1 img098 | |
| Viability, cost, and testing of fitting Hartford shock absorbers to overcome complaints about thick leaf springs. | 1st Oct 1921 | Box 180 \ M1 \ 1 img099 | |
| Considering alternative shock absorbers for the Goshawk model. | 31th Oct 1921 | Box 180 \ M1 \ 1 img100 | |
| Report detailing vehicle mileage, battery and dynamo issues, and damage to the windscreen. | 10th Jun 1914 | Box 180 \ M1 \ 2 img001 | |
| Engine temperature issues, reaching 95°C and boiling, and a sticking valve that was resolved. | 1st May 1922 | Box 180 \ M1 \ 2 img002 | |
| List of special parts and modifications fitted to a specific car. | 1st May 1922 | Box 180 \ M1 \ 2 img003 | |
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