Rolls-Royce Archives
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
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Engine test report detailing performance characteristics including compression, detonation, vibration, and valve clearances.1st Aug 1921Box 180 \ M1 \ 1  img003
Cylinder block extension, valve timing with different tappet clearances, and water pump flow rate tests.4th Aug 1921Box 180 \ M1 \ 1  img004
Test report on engine oil pump performance, lubrication, and carburation.6th Aug 1921Box 180 \ M1 \ 1  img005
Weak clutch unable to hold torque and a quiet, oil-retaining gearbox.1st Aug 1921Box 180 \ M1 \ 1  img006
Criticisms on the Goshawk 11 engine regarding the over-elasticity of its cylinder head studs.8th Aug 1921Box 180 \ M1 \ 1  img007
Design and manufacturing issues with studs, cylinder water jacket tubes, and countersunk screws.1st Aug 1921Box 180 \ M1 \ 1  img008
Recommendations for improvements to the engine casing and flywheel casing, including waterproofing and preventing dropped parts.1st Aug 1921Box 180 \ M1 \ 1  img009
Letter discussing criticisms and design aspects of the Goshawk II engine, specifically regarding studs and water jackets.8th Aug 1921Box 180 \ M1 \ 1  img010
Technical memo discussing design points for countersunk screws, flywheel casing, clutch trunnion, and spring drive.8th Aug 1921Box 180 \ M1 \ 1  img011
Design considerations for a spring drive, pipes, oil pump, engine suspension, and carburetor.8th Aug 1921Box 180 \ M1 \ 1  img012
Design and features of an oil level indicator, oil filter, inspection cover, and core plugs.8th Aug 1921Box 180 \ M1 \ 1  img013
Test runs of the Goshawk 11 engine, detailing issues with the clutch trunnion and concerns about cylinder studs.11th Aug 1921Box 180 \ M1 \ 1  img014
Horsepower tests to measure power loss from heating the induction pipe, and progress on swaging cylinder tubes.11th Aug 1921Box 180 \ M1 \ 1  img015
Cracked exhaust pipe, carburetter flooding, and engine performance with a paraffin mixture.15th Aug 1921Box 180 \ M1 \ 1  img016
The post-test dismantling and examination of a Goshawk 11 engine and a Goshawk 11 universal joint.15th Aug 1921Box 180 \ M1 \ 1  img017
Continuation of a memo regarding an engine oil leak and the use of paper washers as a fix.15th Aug 1921Box 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 1921Box 180 \ M1 \ 1  img019
The Goshawk 11 engine, detailing further testing on pistons, clutch performance, and wheel/tyre specifications.19th Aug 1921Box 180 \ M1 \ 1  img020
Use of 20° angle teeth versus standard teeth in the Goshawk II gear box.1st Jan 1921Box 180 \ M1 \ 1  img021
Test report on the Goshawk 11 chassis, detailing noise issues and proposed modifications to reduce them.1st Sep 1921Box 180 \ M1 \ 1  img022
Axle noise, crankshaft vibration, and clutch issues including plate buckling and disengagement.1st Sep 1921Box 180 \ M1 \ 1  img023
Advantages of a Mack Truck clutch design and a proposal for a new clutch fabric.1st Sep 1921Box 180 \ M1 \ 1  img024
With a diagram, proposing a 'silencer within a silencer' design to reduce a tinny noise in the exhaust.1st Sep 1921Box 180 \ M1 \ 1  img025
Query regarding necessary equipment for dynamos and motors from outside manufacturers for the 'Goshawk II'.19th Aug 1921Box 180 \ M1 \ 1  img026
The features of the non-trembler battery ignition system for the Goshawk II engine.1st Aug 1921Box 180 \ M1 \ 1  img027
Continued memo from R. to Mr. Walker discussing features of an engine ignition system.1st Aug 1921Box 180 \ M1 \ 1  img028
Confirmation of a telegram regarding a meeting and gears for a Goshawk two gear box.31th Aug 1921Box 180 \ M1 \ 1  img029
Status report on dynamos and starter motors from various suppliers for the 'Goshawk II' project.19th Aug 1921Box 180 \ M1 \ 1  img030
Design and features of the 'Goshawk II' open body.19th Jul 1921Box 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 1921Box 180 \ M1 \ 1  img032
The first test run of the Goshawk 11 engine and gearbox units.22th Jul 1921Box 180 \ M1 \ 1  img033
Initial test bench report on the Goshawk 11 engine and its gear units.22th Jul 1921Box 180 \ M1 \ 1  img034
The testing of the second Goshawk II engine and gearbox unit, detailing oil leak issues.8th Aug 1921Box 180 \ M1 \ 1  img035
The performance and running costs of straight-sided cord tyres following post-war complaints.1st Jun 1921Box 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 1921Box 180 \ M1 \ 1  img037
Universal adoption of straight-sided cord tyres and their performance on the 'Goshawk' experimental car.22th Jun 1921Box 180 \ M1 \ 1  img038
Conveying Mr. Royce's request for particulars and expressing concerns about the Goshawk II dynamo and motor project.1st Jun 1921Box 180 \ M1 \ 1  img039
Continued memo regarding a modification to prevent oil soak-through, and details on a suitable Autovac Tank.1st Aug 1921Box 180 \ M1 \ 1  img040
Road test report on the 'Goshawk' 11 chassis (X4219), comparing its performance to the 40/50 HP model.29th Aug 1921Box 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 1921Box 180 \ M1 \ 1  img042
Test bench finding on the cause of oil leakage from a universal joint.1st Aug 1921Box 180 \ M1 \ 1  img043
The Goshawk 11 chassis, detailing issues with the dashboard, controls, and various fittings, with suggestions for improvement.30th Aug 1921Box 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 1921Box 180 \ M1 \ 1  img045
The specifications and wiring for 'Goshawk II' lamps.13th Aug 1921Box 180 \ M1 \ 1  img046
From 'E.' to 'H.S.' responding to a list of points requiring attention on the 'Goshawk II' engine.26th Aug 1921Box 180 \ M1 \ 1  img047
List of complaints regarding a vehicle chassis and other components, with corresponding handwritten remarks and actions.26th Aug 1921Box 180 \ M1 \ 1  img049
Test report on the Goshawk 11 rear brakes, detailing dynamometer performance, failure of aluminium shoes, and material comparison.1st Oct 1921Box 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 1921Box 180 \ M1 \ 1  img051
Cracked induction pipe on Goshawk 11 and performance improvements after repair.8th Sep 1921Box 180 \ M1 \ 1  img052
Improvements and issues with the Goshawk II chassis, focusing on the direct drive clutch and clutch plate.14th Sep 1921Box 180 \ M1 \ 1  img053
Alternative clutch designs, materials, and testing suggestions.1st Sep 1921Box 180 \ M1 \ 1  img054
Modifications to the 'Goshawk II' carburettor and addressing a cracked induction pipe.12th Sep 1921Box 180 \ M1 \ 1  img055
Internal memorandum discussing component changes and design updates for a vehicle.1st Sep 1921Box 180 \ M1 \ 1  img056
Modifications to the springs, exhaust system, fan, and undershield of American cars.14th Sep 1921Box 180 \ M1 \ 1  img057
Delco starter switch, its carbon and copper contacts, and a recommendation for an alternative for the Goshawk II.15th Sep 1921Box 180 \ M1 \ 1  img058
From E. to H.S. conveying Mr. Royce's query on evidence for Delco starter switch failures.15th Sep 1921Box 180 \ M1 \ 1  img059
The failure of a carbon copper type starter switch and the recommendation for a more reliable plain switch.15th Sep 1921Box 180 \ M1 \ 1  img060
Experiments on the Goshawk 11 crankshaft friction damper to reduce engine noise and vibration.15th Sep 1921Box 180 \ M1 \ 1  img061
Letter discussing the state of drawings for the 'Goshawk II' control mechanism.20th Sep 1921Box 180 \ M1 \ 1  img062
Technical memorandum detailing tests and proposed modifications for the Goshawk 11 engine components.9th Sep 1921Box 180 \ M1 \ 1  img063
Issues with jack pads, brake drums, and induction/exhaust pipes for the Coshamk 11 (X4219).27th Sep 1921Box 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 1921Box 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 1921Box 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 1921Box 180 \ M1 \ 1  img067
Dispatching drawing Lec.1458 showing the spring drive, slipper flywheel, and temporary wheelcase for the Goshawk II engine.21th Oct 1921Box 180 \ M1 \ 1  img068
Investigation into the cause of a 'power roar' from the Goshawk 11 induction system.1st Oct 1921Box 180 \ M1 \ 1  img069
Issues and recommendations for a vehicle's clutch, petrol tap, wiring, and rear axle oil filler.1st Oct 1921Box 180 \ M1 \ 1  img070
On design improvements, covering filler accessibility, adding a rear valance, and universal joint lubrication issues.10th Oct 1921Box 180 \ M1 \ 1  img071
The Goshawk 11 carburetter's slow running issues and the advantages of a piston-type throttle.1st Oct 1921Box 180 \ M1 \ 1  img072
Modified induction pipe design (Lec.1459) for the Goshawk II engine.1st Oct 1921Box 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 1921Box 180 \ M1 \ 1  img074
Investigation into the cause of a roaring noise in the Goshawk engine's induction system.10th Oct 1921Box 180 \ M1 \ 1  img075
Gearbox, steering, and induction roar tests.13th Oct 1921Box 180 \ M1 \ 1  img076
Troubleshooting issues with a Lucas Starter Motor's Bendix Pinion failing to disengage on a Goshawk 11 engine.1st Oct 1921Box 180 \ M1 \ 1  img077
Goshawk 11 engine issues, specifically induction roar and starter motor pinion engagement.14th Oct 1921Box 180 \ M1 \ 1  img078
Proposed alterations to the 'GOSHAWK II' carburettor, including the addition of a silencer and changes to the controls.11th Oct 1921Box 180 \ M1 \ 1  img079
From R. to H.S. regarding the hope for a simpler scheme.1st Oct 1921Box 180 \ M1 \ 1  img080
Brake casting material failures and potential alternatives following a test.11th Oct 1921Box 180 \ M1 \ 1  img081
Selection of material for 'Goshawk II' frames.10th Oct 1921Box 180 \ M1 \ 1  img082
The Goshawk II's electrical equipment, discussing dynamo options and a proposed oil-immersed starter switch.1st Oct 1921Box 180 \ M1 \ 1  img083
Modifications to the Goshawk II carburettor scheme based on Mr. Royce's instructions.17th Oct 1921Box 180 \ M1 \ 1  img084
Technical memorandum regarding the Goshawk II engine, discussing the gearbox, crankshaft damper, and the use of aluminium pistons.1st Oct 1921Box 180 \ M1 \ 1  img085
Radiator appearance, clutch shudder, and starter motor.17th Oct 1921Box 180 \ M1 \ 1  img086
From R. to H.S. discussing the pitch of threads and options for making a drive more silent.20th Oct 1921Box 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 1931Box 180 \ M1 \ 1  img088
Design issues and requirements for the Goshawk 11 chassis and components.26th Oct 1921Box 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 1921Box 180 \ M1 \ 1  img090
Potential failure in the Goshawk 11 gearbox due to impractical 2.BA bolts.26th Oct 1921Box 180 \ M1 \ 1  img091
Cause of intake noise in the Goshawk II engine and proposing modifications to resolve it.27th Oct 1921Box 180 \ M1 \ 1  img092
Engine vibration, balance, and improvements to various components including pistons, ignition, brakes, and carburettor.1st Oct 1921Box 180 \ M1 \ 1  img093
Alterations to the ignition advance specifications for the Goshawk II engine.31th Oct 1921Box 180 \ M1 \ 1  img094
Parts failures following a 20-hour bumper rig test on the Goshawk 11 chassis.26th Oct 1921Box 180 \ M1 \ 1  img095
Summary table of a bumper test on a Goshawk II chassis, detailing component failure times in hours.26th Oct 1921Box 180 \ M1 \ 1  img096
Design of the Bendix Pinion, comparing its bearing and thrust design to American cars.28th Oct 1921Box 180 \ M1 \ 1  img097
Modifications to the Goshawk II silencer for carburettor and control gear.29th Oct 1921Box 180 \ M1 \ 1  img098
Viability, cost, and testing of fitting Hartford shock absorbers to overcome complaints about thick leaf springs.1st Oct 1921Box 180 \ M1 \ 1  img099
Considering alternative shock absorbers for the Goshawk model.31th Oct 1921Box 180 \ M1 \ 1  img100
Report detailing vehicle mileage, battery and dynamo issues, and damage to the windscreen.10th Jun 1914Box 180 \ M1 \ 2  img001
Engine temperature issues, reaching 95°C and boiling, and a sticking valve that was resolved.1st May 1922Box 180 \ M1 \ 2  img002
List of special parts and modifications fitted to a specific car.1st May 1922Box 180 \ M1 \ 2  img003


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