| Description | Date | Identifier | |
| Exception to the normal 10,000-mile proving requirement for the 20HP chassis torque reaction damping and engine suspension. | 9th Oct 1923 | Box 74 \ 4 scan0099 | |
| Goshawk-II engine mounting tests, discussing vibration reduction by adding weight. | 1st Oct 1923 | Box 74 \ 4 scan0100 | |
| Test log comparing various engine mounting configurations and their effects on vibrations. | 11th Oct 1923 | Box 74 \ 4 scan0101 | |
| New frame brackets and improvements to the Goshawk chassis. | 13th Oct 1923 | Box 74 \ 4 scan0102 | |
| Engine mounting and vibration damping tests for the 2-Goshawk-11 car. | 1st Oct 1923 | Box 74 \ 4 scan0103 | |
| Differences in engine mounting between the Marmon and Goshawk engines. | 6th Oct 1923 | Box 74 \ 4 scan0104 | |
| Authorizing the fitting of a Torque Reaction Damping Device to all 40/50 HP chassis demonstration cars. | 23th Oct 1923 | Box 74 \ 4 scan0105 | |
| Correcting an incorrectly given chassis number for a 40/50 Chassis. | 23th Oct 1923 | Box 74 \ 4 scan0106 | |
| Experiments concerning low-speed torque reaction vibrations in 40/50 HP and 20 HP chassis. | 25th Oct 1923 | Box 74 \ 4 scan0107 | |
| The standardisation of parts for 20 HP and 40/50 HP Cars. | 2nd Feb 1924 | Box 74 \ 4 scan0108 | |
| The 20-HP suspension engine damping device, proposing alterations to drawing E53049 to achieve a more effective damping range. | 2nd Feb 1924 | Box 74 \ 4 scan0109 | |
| 20 HP engine's disc crankshaft, detailing test bench results, vibration analysis, and weight comparison. | 1st Feb 1924 | Box 74 \ 4 scan0110 | |
| Report page concluding that a damped spring drive should be fitted to overcome an issue at full power. | 29th Feb 1924 | Box 74 \ 4 scan0111 | |
| Overrun vibration, the solution of a thicker shaft, and the effects of a heavier flywheel. | 29th Feb 1924 | Box 74 \ 4 scan0112 | |
| Tests for axle torsional movement and vibration under torque control. | 11th Jun 1924 | Box 74 \ 4 scan0113 | |
| Vibrations in a 20 HP disc crankshaft compared to a standard crankshaft. | 26th Sep 1924 | Box 74 \ 4 scan0114 | |
| Technical query regarding high-speed engine vibration on Goshawk 11 chassis 5-G-11. | 1st Oct 1924 | Box 74 \ 4 scan0115 | |
| Testing a disc crankshaft for a 20 HP engine, detailing performance and vibration characteristics. | 12th Jul 1923 | Box 74 \ 4 scan0116 | |
| Continued memo suggesting the use of a damped spring drive to overcome an issue at full power. | 8th Sep 1911 | Box 74 \ 4 scan0117 | |
| Instructions with a diagram for a rig modification to simultaneously test two axles. | 8th Sep 1911 | Box 74 \ 4 scan0118 | |
| Quotation from Edward C. Herbert Ltd for an Olsen's 100,000 lbs capacity testing machine. | 16th Oct 1911 | Box 74 \ 4 scan0119 | |
| List of various testing machines with their specifications and prices. | 16th Oct 1911 | Box 74 \ 4 scan0120 | |
| Letter from Edward G. Herbert, Limited, quoting prices and providing details for various testing machines. | 16th Oct 1911 | Box 74 \ 4 scan0121 | |
| Unit testing, proposing a new engine testing scheme using dynamos and discussing gearbox testing. | 9th Sep 1911 | Box 74 \ 4 scan0122 | |
| Challenges and proposed improvements for a gearbox testing rig to better isolate and observe noises. | 9th Sep 1911 | Box 74 \ 4 scan0123 | |
| Suggested modifications to an axle testing rig. | 9th Sep 1911 | Box 74 \ 4 scan0124 | |
| Unit testing procedures for engines and gearboxes to diagnose issues when coupled versus tested individually. | 19th Feb 1912 | Box 74 \ 4 scan0125 | |
| From Mr. Royce suggesting the use of a worm wheel axle on the new axle test rig. | 19th Feb 1912 | Box 74 \ 4 scan0126 | |
| Instructions from Mr Royce regarding modifications to the axle test rig dynamometer. | 7th Mar 1912 | Box 74 \ 4 scan0127 | |
| Requesting new pulleys with two grooves for the axle testing rig. | 13th Mar 1912 | Box 74 \ 4 scan0128 | |
| From Mr Royce regarding the specification for the coupling shaft on new engine dynamometers. | 23th Apr 1912 | Box 74 \ 4 scan0129 | |
| Departmental memo requesting an urgent order of tackle and instruments for axle strain tests. | 9th May 1912 | Box 74 \ 4 scan0130 | |
| Departmental memo regarding the ordering of parts and instruments for axle strain tests. | 13th May 1912 | Box 74 \ 4 scan0131 | |
| Departmental memo regarding axle strain tests and seeking approval to order parts. | 16th May 1912 | Box 74 \ 4 scan0132 | |
| Design and requirements for an apparatus to perform axle strain tests. | 6th Jul 1912 | Box 74 \ 4 scan0133 | |
| Proposal for acquiring general testing tackle, including a hydraulic ram, for applying loads accurately. | 6th Jul 1912 | Box 74 \ 4 scan0134 | |
| Axle testing and the cost-effectiveness of using ballast bags instead of weights for the experimental shop. | 11th Jul 1912 | Box 74 \ 4 scan0135 | |
| To Mr Royce regarding the implementation of a card system for old experimental parts. | 11th Jul 1912 | Box 74 \ 4 scan0136 | |
| Requesting a copy of a parts list for testing tackle to get it sanctioned by Mr Royce. | 23th Jul 1912 | Box 74 \ 4 scan0137 | |
| Magazine clipping describing the Crossley Works' Test Body used for chassis testing. | 14th Aug 1912 | Box 74 \ 4 scan0138 | |
| Requesting the rigging of a new, large resistance tank for the Experimental Test engine. | 19th Nov 1912 | Box 74 \ 4 scan0139 | |
| Instruction to order various precision measuring tools from a Starretts list. | 11th Dec 1912 | Box 74 \ 4 scan0140 | |
| Requesting an order for various tools from a Starrett's catalogue for the Experimental Department. | 12th Dec 1912 | Box 74 \ 4 scan0141 | |
| Merits of different metal fatigue and impact testing methods. | 11th Oct 1913 | Box 74 \ 4 scan0142 | |
| Instruction sheet with a sketch and dimensions for manufacturing one valve for the Experimental Shop. | 24th Oct 1913 | Box 74 \ 4 scan0143 | |
| Internal request to borrow a direct current motor for a fortnight whilst a generator undergoes alterations. | 23th Dec 1913 | Box 74 \ 4 scan0144 | |
| Responding to an inquiry about the availability of a direct current motor for the crankshaft analysing rig. | 30th Dec 1913 | Box 74 \ 4 scan0145 | |
| Invoice from Curry's for a special fork made for experimental tests. | 11th Nov 1924 | Box 74 \ 4 scan0146 | |
| To Mr. Peskett requesting the setup of tackle to repeat a bumper test experiment. | 13th Sep 1926 | Box 74 \ 4 scan0147 | |
| Engine horsepower test report investigating the effect of compression leakage on performance. | 19th May 1915 | Box 74 \ 4 scan0148 | |
| Analysis of piston ring fitting and its effects on engine horsepower, gas leakage, and friction. | 19th May 1915 | Box 74 \ 4 scan0149 | |
| Typed note regarding power loss from leakage past rings being inversely proportional to engine speed. | 20th Aug 1910 | Box 74 \ 4 scan0150 | |
| Article from 'The Motor Trader' presenting comparative chassis efficiency data from a report by Dr. Riedler. | 20th Aug 1910 | Box 74 \ 4 scan0151 | |
| Request for a horsepower speed curve for the standard car engine, urgently required by the Ministry of Munitions. | 27th Feb 1917 | Box 74 \ 4 scan0152 | |
| Letter from Rolls-Royce of America requesting engine performance data from the UK parent company. | 29th Oct 1920 | Box 74 \ 4 scan0153 | |
| Power of a car engine, confirming that the necessary information was taken by Mr. Hives to the U.S.A. | 20th Dec 1920 | Box 74 \ 4 scan0154 | |
| Horse power curves for the standard 40/50 engine. | 1st May 1921 | Box 74 \ 4 scan0155 | |
| Instruction sheet detailing a horsepower comparison test for a 40/50 engine with different induction pipes. | 18th May 1921 | Box 74 \ 4 scan0156 | |
| Letter from the American branch to the UK branch questioning a discrepancy in engine power curves. | 4th Aug 1921 | Box 74 \ 4 scan0157 | |
| Clarifying the German horsepower equivalents for the 20-HP and 40/50 models. | 4th Sep 1924 | Box 74 \ 4 scan0158 | |
| Engine vibrations without a slipper wheel for a 48-PK car with a 40/50 engine. | 17th Dec 1924 | Box 74 \ 4 scan0159 | |
| 20 HP engine's exhaust cutout, comparing acceleration and max speed with the cutout open and closed. | 17th Dec 1924 | Box 74 \ 4 scan0160 | |
| Hill climbing performance tests, detailing speedometer readings and time taken over a set distance. | 22th Feb 1921 | Box 74 \ 4 scan0161 | |
| Data table from dynamometer tests on the Goshawk I engine, comparing theoretical and actual values. | 22th Feb 1921 | Box 74 \ 4 scan0162 | |
| Goshawk I dynamometer test results showing road speeds and various revolution readings. | 22th Feb 1921 | Box 74 \ 4 scan0163 | |
| Instruction sheet with a table of power curve data. | 4th Mar 1912 | Box 74 \ 4 scan0164 | |
| Fair comparison method for the Goshawk engine and a carburetion experiment. | 16th Mar 1922 | Box 74 \ 4 scan0165 | |
| Request for dynamometer horsepower figures and valve timing for the Goshawk 11, for comparison with other cars. | 3rd Apr 1922 | Box 74 \ 4 scan0166 | |
| Horsepower tests for the GOSHAWK II, comparing dynamometer and unit test bed results. | 1st Apr 1922 | Box 74 \ 4 scan0167 | |
| Suggesting comparative hill-climbing tests between the 40/50-HP and Goshawk models. | 11th May 1922 | Box 74 \ 4 scan0168 | |
| Proposal for conducting comparative tests between the 40/50 HP and Goshawk models. | 12th May 1922 | Box 74 \ 4 scan0169 | |
| Cancelling further comparative tests for the 40/50-HP and Goshawk engines. | 16th May 1922 | Box 74 \ 4 scan0170 | |
| Customer criticisms about the Goshawk car's low-speed power and comparing its performance to the 40/50 model. | 17th May 1922 | Box 74 \ 4 scan0171 | |
| Responding to a suggestion to compare the Goshawk engine on the basis of capacity per ton mile. | 18th May 1922 | Box 74 \ 4 scan0172 | |
| Goshawk 11 engine's torque curve and hill climbing performance. | 20th May 1922 | Box 74 \ 4 scan0173 | |
| Test report on the performance of the Goshawk 11 car at Brooklands, detailing speed and acceleration after fixing a pre-ignition problem. | 18th Aug 1922 | Box 74 \ 4 scan0174 | |
| Excessive oil consumption and smokey exhaust in Goshawk 11 engines, with a proposed solution of beveling the piston rings. | 9th Oct 1932 | Box 74 \ 4 scan0175 | |
| Continued discussion on the adoption of a scraper ring with a bevel for engine efficiency. | 12th Dec 1922 | Box 74 \ 4 scan0176 | |
| Particulars of Goshawk X4134, including chassis weight, engine capacity, horsepower curve, and consumption figures. | 12th Dec 1922 | Box 74 \ 4 scan0177 | |
| Horsepower curve data for an engine originally fitted to chassis 2-G-11, taken on its removal with the silencer connected. | 28th Mar 1923 | Box 74 \ 4 scan0178 | |
| Dynamometer test results for a Phantom II vehicle with specific modifications. | 27th Apr 1923 | Box 74 \ 4 scan0179 | |
| Camshaft tests for a 20 HP engine, detailing results from both test bench and road tests. | 3rd Oct 1923 | Box 74 \ 4 scan0180 | |
| The top speed of the 20 HP model to assess its potential as a fast car competitor to Bentley. | 9th Jan 1923 | Box 74 \ 4 scan0181 | |
| Maximum speed of the 20 HP car and the potential for a sporting version, in comparison to Bentley. | 9th Jan 1923 | Box 74 \ 4 scan0182 | |
| Performance data sheet for the Coshawk 11, detailing average production results from January 1923. | 27th Mar 1923 | Box 74 \ 4 scan0183 | |
| The performance comparison and mechanical faults of a 20 HP exhaust cutout. | 8th Apr 1923 | Box 74 \ 4 scan0184 | |
| Modifying a camshaft to improve engine power at low speeds and reduce roar. | 1st Oct 1923 | Box 74 \ 4 scan0185 | |
| The performance difference of a 20 HP car using various brands of petrol. | 26th Oct 1923 | Box 74 \ 4 scan0186 | |
| Comparing the performance of three 20 HP cars using various brands of petrol. | 25th Oct 1923 | Box 74 \ 4 scan0187 | |
| Comparing the performance of different grades of petrol during low-speed, full-throttle conditions. | 25th Oct 1923 | Box 74 \ 4 scan0188 | |
| Proposing modifications to the Goshawk engine to improve efficiency, power, and acceleration. | 27th Jun 1924 | Box 74 \ 4 scan0189 | |
| Performance graph for a 20-HP engine showing heat flow, horsepower, and fuel consumption against RPM. | 29th Sep 1924 | Box 74 \ 4 scan0190 | |
| Heat flow to the jacket water of a Goshawk engine. | 13th Oct 1924 | Box 74 \ 4 scan0191 | |
| Provision of 20-HP power curves based on recent chassis dynamometer tests. | 1st Mar 1925 | Box 74 \ 4 scan0192 | |
| Dynamometer graph plotting Horsepower against RPM for a 20HP chassis. | 3rd Mar 1925 | Box 74 \ 4 scan0193 | |
| Hand-drawn graph plotting Horsepower (HP) against Revolutions Per Minute (RPM) for an 'Average 10 Engine 20HP Unit'. | 26th Feb 1925 | Box 74 \ 4 scan0194 | |
| Request for dynamometer and unit test power curves for the 20 HP engine following a new camshaft fitment. | 26th Feb 1925 | Box 74 \ 4 scan0195 | |
| Attached power curve for the 20-HP engine, based on the average of 10 units from a test bed. | 13th Mar 1925 | Box 74 \ 4 scan0196 | |
| Experiment report on increasing the power output of a 20 HP engine by modifying the carburetter and cylinder block passage. | 17th Feb 1926 | Box 74 \ 4 scan0197 | |
| Engine power curve tests comparing standard and modified carburetter and pipe configurations. | 15th Jan 1925 | Box 74 \ 4 scan0198 | |
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