| Description | Date | Identifier | |
| Use of Asbestos and 'Euralite' for heat insulation under the floorboards of a 'Phantom' car. | 25th Sep 1926 | Box 74 \ 3 scan0181 | |
| Letter advising against using 'Euralite' as a substitute for asbestos under the floorboards of 'Phantom' cars due to its unsuitability for heat resistance. | 17th Sep 1926 | Box 74 \ 3 scan0182 | |
| Letter from coachbuilder Hooper & Co. regarding asbestos and 'Euralite' insulation trials on 'Phantom' cars. | 23th Sep 1926 | Box 74 \ 3 scan0183 | |
| Proposal to resolve a heating complaint by covering the rear silencer with an asbestos and tin plate jacket. | 27th Sep 1926 | Box 74 \ 3 scan0184 | |
| Alterations to a car body and concerns about its durability on Continental roads. | 28th Sep 1926 | Box 74 \ 3 scan0185 | |
| Coachbuilder Hoopers' use of Euralite material for body alterations. | 28th Sep 1926 | Box 74 \ 3 scan0186 | |
| Covering memo regarding interior heat in 'Phantom' cars. | 28th Sep 1926 | Box 74 \ 3 scan0187 | |
| Charges for asbestos floorboards and pipe jacketing for interior heat in 'Phantom' cars. | 25th Sep 1926 | Box 74 \ 3 scan0188 | |
| Causes and solutions for the overheating of car bodies, particularly in Phantom models. | 21th Sep 1926 | Box 74 \ 3 scan0189 | |
| Overheating bodies, discussing the use of pure asbestos versus an asbestos mixture for floor linings. | 1st Oct 1926 | Box 74 \ 3 scan0190 | |
| Querying the procedure for authorising chassis design alterations by various depots, citing a specific example from Paris. | 4th Oct 1926 | Box 74 \ 3 scan0191 | |
| Potential issues with a silencer lagging modification, including stone damage and fouling other components. | 5th Oct 1926 | Box 74 \ 3 scan0192 | |
| Query about testing an asbestos and tin insulation scheme around the exhaust to prevent overheating in car bodies. | 20th Oct 1926 | Box 74 \ 3 scan0193 | |
| Scheme from Paris and the importance of proper floorboard fitting by coachbuilders to prevent body fumes. | 23th Oct 1926 | Box 74 \ 3 scan0194 | |
| Methods to prevent heat from coming through the rear foot-boards of vehicles. | 13th Nov 1926 | Box 74 \ 3 scan0195 | |
| Proposal for a heat shield for the Phantom's exhaust silencer to address complaints of excessive heat. | 26th Nov 1926 | Box 74 \ 3 scan0196 | |
| Design to mitigate heat under the rear footboards on the Phantom model. | 29th Nov 1926 | Box 74 \ 3 scan0197 | |
| Design of flexible brackets for a heat shield on an EAC.7 silencer. | 5th May 1927 | Box 74 \ 3 scan0198 | |
| Complaints about over-heating in the rear of Phantom cars and the urgency to find a solution. | 11th May 1927 | Box 74 \ 3 scan0199 | |
| Test report on a rear silencer heat shield to reduce overheating in the interior of Phantom cars. | 25th May 1927 | Box 74 \ 3 scan0200 | |
| Adoption of a heat shield and the continued necessity for fitting sheet asbestos on floorboards. | 8th Jun 1927 | Box 74 \ 3 scan0201 | |
| Clarifying a misunderstanding with the Sales department regarding the general application of a standardized rear silencer baffle. | 8th Jun 1927 | Box 74 \ 3 scan0202 | |
| Querying the recommendation of fitting a baffle on the silencer for both Open and Closed 40/50 HP Chassis models and the short test mileage. | 13th Jul 1927 | Box 74 \ 3 scan0203 | |
| Issues with autovac tank temperature causing petrol vaporization and starvation problems on Alpine passes. | 19th Jul 1927 | Box 74 \ 3 scan0204 | |
| Standardisation of a baffle on the silencer to reduce heat in the car body. | 25th May 1927 | Box 74 \ 3 scan0205 | |
| Standardisation report for a chassis part. | 28th Oct 1927 | Box 74 \ 3 scan0206 | |
| Returning a signed standardisation sheet regarding a baffle on the silencer to reduce heat, specifically for closed cars. | 1st Jul 1927 | Box 74 \ 3 scan0207 | |
| Request for two louvred panels to test the ventilation of the 10-EX front driving seats. | 12th Dec 1927 | Box 74 \ 3 scan0208 | |
| Gas-tightness for the 20 HP gear quadrant and modifications to the gear and brake levers. | 16th Jun 1928 | Box 74 \ 3 scan0209 | |
| Letter regarding complaints of a strong petrol smell in closed body cars, potentially caused by the vacuum tank overheating. | 27th Apr 1928 | Box 74 \ 3 scan0210 | |
| Ordering of forgings for a 20 HP crankshaft. | 28th Feb 1919 | Box 74 \ 3 scan0211 | |
| Print for a 20 HP crankshaft. | 11th Mar 1919 | Box 74 \ 3 scan0212 | |
| Confirming instructions have been received for several 20 HP parts which are now being made. | 25th Jul 1919 | Box 74 \ 3 scan0213 | |
| Adding a retard ignition timing mark to the flywheel, and omitting the advance mark. | 20th Aug 1919 | Box 74 \ 3 scan0214 | |
| Applying the die-cast crankshaft oil cap design from Eagle engines to the 20 HP engine. | 1st Aug 1919 | Box 74 \ 3 scan0215 | |
| The required shortening of the 20 HP crankshaft nose due to crankcase alterations. | 9th Sep 1919 | Box 74 \ 3 scan0216 | |
| Parts fitted to a 'Goshawk' engine for testing. | 1st Sep 1920 | Box 74 \ 3 scan0217 | |
| Extract detailing the cause of oil leaks in the 'Hoshawk' engine crankshaft. | 28th Sep 1920 | Box 74 \ 3 scan0218 | |
| Patent by Dr. F.W. Lanchester for a combined damper and crankshaft pinion. | 24th Feb 1927 | Box 74 \ 3 scan0219 | |
| Mr. Lanchester's patent for a crankshaft damper and its relation to previous company designs. | 11th May 1927 | Box 74 \ 3 scan0220 | |
| The revised 'Goshawk' design, sending drawing LeC.1310 for the new light chassis crankshaft. | 23th Nov 1920 | Box 74 \ 3 scan0221 | |
| Mr. Royce's expectation for the Goshawk II flywheel and clutch plates to be manufactured from cast iron. | 2nd Apr 1921 | Box 74 \ 3 scan0222 | |
| Material change for the Goshawk II engine's flywheel to cast iron. | 8th Apr 1921 | Box 74 \ 3 scan0223 | |
| List of modifications to the 'Goshawk II' flywheel casing and flywheel pointer. | 13th Apr 1921 | Box 74 \ 3 scan0224 | |
| On a design issue with die-casting the crankshaft oil caps for the Goshawk II engine. | 1st May 1921 | Box 74 \ 3 scan0225 | |
| Outlining modifications to the 'Goshawk II' flywheel casing, as detailed in drawing LoC.1437. | 13th Aug 1921 | Box 74 \ 3 scan0226 | |
| Increasing the crankshaft spring drive unit size on the Goshawk 11 engine to address torsional effects. | 13th Sep 1921 | Box 74 \ 3 scan0227 | |
| Experiments with the Goshawk 11 crankshaft friction damper to resolve noise and vibration issues. | 15th Sep 1921 | Box 74 \ 3 scan0228 | |
| With a sketch providing machining instructions for the 'Goshawk II' crankshaft. | 16th Sep 1921 | Box 74 \ 3 scan0229 | |
| Request for torsional deflection data on the Goshawk 11 crankshaft and details on its spring drive. | 9th Sep 1921 | Box 74 \ 3 scan0230 | |
| Drawings for a new crankshaft pinion spring drive for the Goshawk 11 engine. | 21th Sep 1921 | Box 74 \ 3 scan0231 | |
| Deflection test on a Goshawk 11 crankshaft. | 22th Sep 1921 | Box 74 \ 3 scan0232 | |
| Confirmation of a telegram regarding the flywheel diameter for the Goshawk Two. | 1st Oct 1921 | Box 74 \ 3 scan0233 | |
| The appropriate Slipper diameter for the Goshawk 11, pending tests with heavier cast iron pistons. | 1st Oct 1921 | Box 74 \ 3 scan0234 | |
| Sending drawing LeC.1458 for the Goshawk 11 spring drive, slipper flywheel, and temporary wheelcase. | 1st Oct 1921 | Box 74 \ 3 scan0235 | |
| Goshawk 11 crankshaft pinion spring drive, slipper flywheel, and related alterations to future crankcases. | 6th Oct 1921 | Box 74 \ 3 scan0236 | |
| The Goshawk 11 crankshaft pinion spring drive, advising that scheme LeC.1449 is superseded by scheme LeC.1458 with a slipper flywheel. | 10th Oct 1921 | Box 74 \ 3 scan0237 | |
| Modifications to the Goshawk 11 wheelcase, gear, and fan. | 13th Oct 1921 | Box 74 \ 3 scan0238 | |
| Alterations to the fan, radiator, and cowling as per Mr. Royce's instructions. | 13th Oct 1921 | Box 74 \ 3 scan0239 | |
| The design considerations for a crankshaft damper operating at high speeds. | 17th Oct 1921 | Box 74 \ 3 scan0240 | |
| Oil leak on a Goshawk 11 crankshaft, with investigation instructions from Mr. Royce. | 12th Nov 1921 | Box 74 \ 3 scan0241 | |
| Authorising Vickers to proceed with producing dies for the Goshawk 11 crankshaft following modifications by Mr Royce. | 13th Dec 1921 | Box 74 \ 3 scan0242 | |
| Technical report on issues with the Goshawk II chassis, including brakes, water loss, oil filter, and over-oiling. | 12th Jan 1922 | Box 74 \ 3 scan0243 | |
| Clutch experiments comparing standard Ferobestos with Ferodo bonded asbestos. | 12th Jan 1922 | Box 74 \ 3 scan0244 | |
| On tests to resolve over-oiling in the Goshawk 11 engine, focusing on the inlet valve guides and rocker mechanism. | 16th Jan 1922 | Box 74 \ 3 scan0245 | |
| Over-oiling and strainer design for the Goshawk 11 engine. | 19th Jan 1922 | Box 74 \ 3 scan0246 | |
| Instructions for engine oil changes and crankcase maintenance. | 19th Jan 1922 | Box 74 \ 3 scan0247 | |
| Investigation into Goshawk 11 engine vibration issues occurring at high RPM. | 2nd Feb 1922 | Box 74 \ 3 scan0248 | |
| Magneto control gear for the Goshawk 11 engine. | 10th Feb 1922 | Box 74 \ 3 scan0249 | |
| Request to review engine levers to reduce part variations and a note on an upcoming magneto wiring scheme. | 11th Feb 1922 | Box 74 \ 3 scan0250 | |
| Goshawk 11 engine vibration, detailing tests on an out-of-balance slipper wheel. | 11th Feb 1922 | Box 74 \ 3 scan0251 | |
| Confirmation of wire from Royce regarding a crankshaft report and suggestions for modifications. | 11th Feb 1922 | Box 74 \ 3 scan0252 | |
| Drawing No.LeC.1533, which details an extra valve spring and a redesigned valve gear cover nut for the Goshawk 11 engine. | 11th Feb 1922 | Box 74 \ 3 scan0253 | |
| Goshawk 11 engine vibration issues caused by an unbalanced slipper wheel. | 13th Feb 1922 | Box 74 \ 3 scan0254 | |
| Cracked cam wheel on a Goshawk 11 engine due to vibration during high-speed running. | 14th Feb 1922 | Box 74 \ 3 scan0255 | |
| Investigation into Goshawk 11 engine vibrations by analyzing a camshaft slipper wheel. | 16th Feb 1922 | Box 74 \ 3 scan0256 | |
| Mr. Royce's recommendation to manufacture Goshawk 11 slipper flywheels in steel. | 17th Feb 1922 | Box 74 \ 3 scan0257 | |
| Goshawk 11 engine vibration, its potential causes and solutions. | 18th Feb 1922 | Box 74 \ 3 scan0258 | |
| Causes of and solutions for engine vibrations, focusing on crank chamber stiffness and crankshaft bending. | 18th Feb 1922 | Box 74 \ 3 scan0259 | |
| Engine vibrations on the Goshawk II, investigating crank chamber strengthening and flywheel clearance. | 20th Feb 1922 | Box 74 \ 3 scan0260 | |
| Recommendation for the setting of the Goshawk II slipper drive arrangement. | 2nd Feb 1922 | Box 74 \ 3 scan0261 | |
| Goshawk engine vibration issues causing camshaft wheel failure, attributing it to crankcase bending and proposing two stiffening solutions. | 21th Feb 1922 | Box 74 \ 3 scan0262 | |
| High-speed vibration issues in the Goshawk 11 engine, focusing on its unique crankcase design and suspected weaknesses. | 1st Feb 1922 | Box 74 \ 3 scan0263 | |
| Continued document discussing stress testing of engine components, with a focus on main bearings and crankcases. | 2nd Feb 1922 | Box 74 \ 3 scan0264 | |
| Telegram confirming a successful test on a Goshawk engine's crankcase with broad horizontal flanges. | 23th May 1932 | Box 74 \ 3 scan0265 | |
| Extracts from a letter from Mr. Royce discussing car testing, engine vibration, and improvements from France. | 26th Feb 1922 | Box 74 \ 3 scan0266 | |
| Progress report on the Goshawk 11 car, detailing delays, equipment fitting, and troubleshooting for an engine vibration issue. | 9th Mar 1922 | Box 74 \ 3 scan0267 | |
| Modifications for the Goshawk 11 stiffer crankshaft. | 17th Mar 1922 | Box 74 \ 3 scan0268 | |
| Listing altered blueprints for the Goshawk 11 engine's stiffer crankshaft experiment. | 21th Jul 1922 | Box 74 \ 3 scan0269 | |
| Potential improvements for Goshawk engine valves and spring drives. | 18th Dec 1922 | Box 74 \ 3 scan0270 | |
| Modifications to half-time gears, magneto design, and exhaust valves. | 30th Dec 1922 | Box 74 \ 3 scan0271 | |
| Improved spring drive for the Goshawk 11 engine, referencing drawing No.Lec.1665. | 30th Dec 1922 | Box 74 \ 3 scan0272 | |
| Technical note discussing the design of driving springs and the meshing of gear teeth. | 1st Jan 1923 | Box 74 \ 3 scan0273 | |
| Test results of a 20 HP engine with a large crankshaft showing reduced flywheel wobble at high RPM compared to the standard engine. | 1st Jan 1923 | Box 74 \ 3 scan0274 | |
| Trial for a larger Goshawk crankshaft design before standardisation. | 26th Apr 1923 | Box 74 \ 3 scan0275 | |
| The testing of a larger crankshaft for a 20 HP engine, which resulted in worn bearings. | 10th May 1923 | Box 74 \ 3 scan0276 | |
| Clarifying a modification to the Goshawk slipper flywheel, noting an uncommunicated reduction in springs. | 31th May 1923 | Box 74 \ 3 scan0277 | |
| 20 HP engine gear failures caused by insufficient clearance for the slipper flywheel. | 7th Jun 1923 | Box 74 \ 3 scan0278 | |
| Slipper flywheel clearances for the 20 HP chassis spring drive. | 19th Jun 1923 | Box 74 \ 3 scan0279 | |
| Request to change the material of the 20HP flywheel from mild steel to .6 carbon steel and issue a new piece number. | 13th Jul 1923 | Box 74 \ 3 scan0280 | |
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