| Description | Date | Identifier | |
| Experimental parts fitted to the Northcliffe and 40/50 chassis. | 18th Dec 1919 | Box 77 \ 4 scan0152 | |
| Modification to the Hawk Northcliffe Radiator Support involving Blue Prints for a new scheme. | 22th Dec 1919 | Box 77 \ 4 scan0153 | |
| List of experimental parts fitted to the Hawk, Northcliffe model. | 15th Apr 1920 | Box 77 \ 4 scan0154 | |
| Technical memo detailing the design and materials for the 20 HP radiator suspension. | 9th Apr 1919 | Box 77 \ 4 scan0155 | |
| Modification to the radiator mounting and requesting materials for a 20 HP chassis. | 9th Apr 1919 | Box 77 \ 4 scan0156 | |
| To Mr. Clark confirming the receipt of parts from various suppliers for specific experiments and orders. | 30th May 1919 | Box 77 \ 4 scan0157 | |
| Notification of the receipt of locking rings and springs from Messrs Geo. Salter & Co. for experiments. | 6th Jun 1919 | Box 77 \ 4 scan0158 | |
| Design and required modifications for the 20 HP bonnet and radiator, referencing drawing No. LeC.1104. | 13th Jun 1919 | Box 77 \ 4 scan0159 | |
| Radiator heat regulation options for the new 20 HP chassis. | 24th Jun 1919 | Box 77 \ 4 scan0160 | |
| The 'Goshawk' water suction pipe and a required modification using an aluminium packing for the bonnet side rests. | 14th Feb 1920 | Box 77 \ 4 scan0161 | |
| Test report on the Goshawk I vehicle's performance, detailing issues and observations with the radiator, clutch, springing, and vibrations. | 8th Jan 1921 | Box 77 \ 4 scan0162 | |
| Technical memorandum discussing issues and improvements related to brakes, radiator, clutch, and springing. | 12th Jan 1921 | Box 77 \ 4 scan0163 | |
| Worn radiator supporting bushes on a Goshawk I car, proposing replacement with self-lubricating materials. | 2nd Feb 1940 | Box 77 \ 4 scan0164 | |
| Extract of a memorandum regarding the radiator and bonnet design for the Goshawk 11 engine. | 31th Mar 1921 | Box 77 \ 4 scan0165 | |
| Design and construction of Goshawk 11 radiators following a visit to West Wittering. | 31th Mar 1921 | Box 77 \ 4 scan0166 | |
| Receipt of Bakelite Graphite rods from The B.T.H. Co. for producing Radiator Suspension Bushes. | 7th Apr 1921 | Box 77 \ 4 scan0167 | |
| Design and mounting of the 'Goshawk II' radiator and its suspension system. | 1st Apr 1921 | Box 77 \ 4 scan0168 | |
| Drawing No.LeC.1391 for the Goshawk 11 front engine suspension and top water radiator connections. | 13th May 1921 | Box 77 \ 4 scan0169 | |
| Drawings for the 'Goshawk II' bonnet and top radiator support, noting that designs for the bonnet clip and dashboard are still undecided. | 8th Jun 1931 | Box 77 \ 4 scan0170 | |
| Progress update memo regarding the Goshawk 11 Chassis, detailing component status. | 21th Jun 1921 | Box 77 \ 4 scan0171 | |
| Slight leak from a radiator's bottom tank and proposing an improved suspension design using a rubber pad. | 9th Sep 1921 | Box 77 \ 4 scan0172 | |
| Suggesting an aesthetic improvement to the radiator design by adding a radius to its back edge. | 17th Oct 1921 | Box 77 \ 4 scan0173 | |
| Specification for the radiator cap to be made from nickel silver and suitable for carrying the mascot. | 21th Oct 1921 | Box 77 \ 4 scan0174 | |
| Extract about fitting thermostat-operated shutters to radiators for regulating water temperature. | 26th Oct 1921 | Box 77 \ 4 scan0175 | |
| Recommendation to solder the radiator vent pipe to prevent it from rattling. | 15th Nov 1921 | Box 77 \ 4 scan0176 | |
| Cracked radiator gusset plate discovered during a Goshawk 11 chassis bumping test. | 1st Dec 1921 | Box 77 \ 4 scan0177 | |
| The Goshawk 11 radiator fixing bumping test, confirming the intentional flexibility of the design. | 9th Dec 1921 | Box 77 \ 4 scan0178 | |
| Extract from the Sales Conference minutes requesting samples of different filler caps and plates for the Goshawk model. | 10th Dec 1921 | Box 77 \ 4 scan0179 | |
| Design of filocaps and R-R plates for the Goshawk. | 13th Dec 1921 | Box 77 \ 4 scan0180 | |
| Methods to visually distinguish the experimental Goshawk car from the 40/50 model. | 15th Dec 1921 | Box 77 \ 4 scan0181 | |
| Body types for the Goshawk model, comparing them to a Coupe Cabriolet and mentioning an all-weather body by Barker. | 30th Dec 1921 | Box 77 \ 4 scan0182 | |
| Extract discussing modifications to the radiator tank and its mounting on the chassis. | 30th Dec 1921 | Box 77 \ 4 scan0183 | |
| Necessity of radiator shutters for the Goshawk 11 model to control water temperature in cold climates. | 1st Jan 1922 | Box 77 \ 4 scan0184 | |
| Policy discussion on fitting shutters to cars exported to cold climates and for cars used in England. | 2nd Jan 1922 | Box 77 \ 4 scan0185 | |
| The Goshawk radiator fixing, referencing drawing No.LeC.1512 and discussing gusset plate design. | 1st Jan 1922 | Box 77 \ 4 scan0186 | |
| The Goshawk radiator design, comparing a new pressed version with rounded corners to the old hand-fitted sharp-cornered scheme. | 5th Jan 1922 | Box 77 \ 4 scan0187 | |
| Proposal to send a Goshawk chassis with three different radiator types to coachbuilder Hoopers for evaluation on a limousine body. | 1st Jan 1922 | Box 77 \ 4 scan0188 | |
| Issues with the Goshawk 11 chassis, focusing on brakes, water loss, oil filters, and over-oiling. | 12th Jan 1922 | Box 77 \ 4 scan0189 | |
| Clutch experiments comparing Ferodo bonded asbestos with the original Ferobestos. | 12th Jan 1922 | Box 77 \ 4 scan0190 | |
| The fitting of a Hooper Limousine body to a Goshawk II chassis. | 13th Jan 1922 | Box 77 \ 4 scan0191 | |
| Proposed visit to coachbuilder Hoopers regarding issues with fitting Mulliner bodies and radiator options. | 16th Jan 1922 | Box 77 \ 4 scan0192 | |
| Time a chassis is required for and arranging an inspection of other radiators. | 16th Jan 1922 | Box 77 \ 4 scan0193 | |
| The difficulties of fitting Hooper and Mulliner bodies to a chassis and options for disguising it. | 17th Jan 1922 | Box 77 \ 4 scan0194 | |
| The receipt and testing of a Goshawk II radiator supplied by Serck Radiators Ltd. | 2nd Feb 1922 | Box 77 \ 4 scan0195 | |
| Letter from Serck Radiators regarding issues with fitting screws on a radiator and its dispatch. | 31th Jan 1922 | Box 77 \ 4 scan0196 | |
| Wheel options (Rudge-Whitworth vs. Michelin) and a proposed thermostat-controlled louvre system for the Goshawk. | 4th Feb 1922 | Box 77 \ 4 scan0197 | |
| Urgent procurement of radiators to meet a chassis delivery deadline. | 1st Mar 1922 | Box 77 \ 4 scan0198 | |
| Timeline for testing a 'Serck' radiator for the 'Goshawk' and an initial quality assessment. | 2nd Mar 1922 | Box 77 \ 4 scan0199 | |
| Fitting of camouflaged hub caps and dissimilar radiator name-plates to Goshawk experimental chassis. | 17th Feb 1922 | Box 77 \ 4 scan0200 | |
| Test results concerning water flow and loss from a Goshawk 11 engine under various conditions. | 29th Mar 1922 | Box 77 \ 4 scan0201 | |
| Radiator outlet pipe specifications and a defect requiring urgent attention. | 24th Apr 1922 | Box 77 \ 4 scan0202 | |
| Design of the carburettor control on the instrument board, highlighting an issue with the operating lever alignment and proposing a redesign. | 24th Apr 1922 | Box 77 \ 4 scan0203 | |
| New scheme for the louvres, fan, and thermostat on the Goshawk 11 chassis. | 28th Apr 1922 | Box 77 \ 4 scan0204 | |
| Questioning a modification to the Goshawk 11 radiator outlet that would prevent steam from warning the driver of boiling. | 10th May 1922 | Box 77 \ 4 scan0205 | |
| Excessive weight of the Goshawk 11 radiator, suggesting it be dismantled for investigation. | 1st May 1922 | Box 77 \ 4 scan0206 | |
| Justification for fitting a thermometer on Goshawks in relation to the radiator over-flow outlet. | 13th May 1922 | Box 77 \ 4 scan0207 | |
| Telegram about diagnosing a cracked cylinder head causing water loss and overheating. | 25th May 1922 | Box 77 \ 4 scan0208 | |
| Cracked cylinder head on a Goshawk engine due to overheating and proposing modifications to the fan drive system. | 24th May 1922 | Box 77 \ 4 scan0209 | |
| Resolving engine water boiling issues by improving the fan belt drive and pulley system. | 24th May 1922 | Box 77 \ 4 scan0210 | |
| Experiments to improve engine cooling, focusing on the fan, belt, radiator, and water circulation. | 24th May 1922 | Box 77 \ 4 scan0211 | |
| Engine modifications to address issues from using dirty water. | 26th May 1922 | Box 77 \ 4 scan0212 | |
| Issues and potential modifications for the Goshawk engine's water cooling system. | 26th May 1922 | Box 77 \ 4 scan0213 | |
| Improving the Goshawk engine's cooling system to prevent priming and steam accumulation. | 30th May 1922 | Box 77 \ 4 scan0214 | |
| Comparative test measuring the velocity of air passing through the radiators of the 40/50 and Goshawk II engines. | 30th May 1922 | Box 77 \ 4 scan0215 | |
| Various tests conducted to reduce water loss in engine cooling systems. | 30th Aug 1922 | Box 77 \ 4 scan0216 | |
| Engine overheating, comparing the 40/50 and Goshawk models, including detonation effects and thermometer reliability. | 1st May 1922 | Box 77 \ 4 scan0217 | |
| Goshawk II engine cooling tests conducted on a test bench. | 31th May 1932 | Box 77 \ 4 scan0218 | |
| The performance of the Goshawk engine during a boiling test. | 1st May 1932 | Box 77 \ 4 scan0219 | |
| Test report on Goshawk fan belt slip and radiator airflow speeds at varying levels of belt tightness. | 1st Jun 1923 | Box 77 \ 4 scan0220 | |
| Test results of Goshawk engine cooling system showing inlet and outlet water temperatures at various speeds. | 1st Jun 1922 | Box 77 \ 4 scan0221 | |
| Engine boiling issues with the Goshawk radiator during testing and awaiting results from a larger fan. | 2nd Jun 1922 | Box 77 \ 4 scan0222 | |
| Modifications to the bonnet and radiator to alter a car's proportions and cooling system. | 2nd Jun 1922 | Box 77 \ 4 scan0223 | |
| Telegram reporting a minute crack in an engine's exhaust valve seat, suggesting the cause is stress. | 2nd Jun 1922 | Box 77 \ 4 scan0224 | |
| Draft telegram regarding engine head failure analysis and stress testing. | 22th Jul 1943 | Box 77 \ 4 scan0225 | |
| Telegram from Royce regarding reproducing a water loss fracture on a test plate. | 7th Jun 1922 | Box 77 \ 4 scan0226 | |
| The examination and testing of a Goshawk engine cylinder head under extreme cooling conditions, running it with boiling water until it evaporated. | 6th Jun 1922 | Box 77 \ 4 scan0227 | |
| Engine testing without water, observing overheating, and proposing further tests to reproduce a cylinder head failure. | 9th Jun 1922 | Box 77 \ 4 scan0228 | |
| Incorrect Goshawk radiator suspension installation, where it is supported by a rubber strip. | 9th Jun 1922 | Box 77 \ 4 scan0229 | |
| Effects of water loss and overheating on Goshawk engines, with proposals for further testing. | 9th Jun 1922 | Box 77 \ 4 scan0230 | |
| Design alterations to the Goshawk bonnet, including raising the radiator and fitting louvres, to improve its shape and elegance. | 6th Sep 1922 | Box 77 \ 4 scan0231 | |
| Modifications for the Goshawk water circulation system. | 1st Jun 1922 | Box 77 \ 4 scan0232 | |
| On Goshawk radiator performance during dynamometer testing, detailing water requirements to maintain temperature. | 1st Jun 1922 | Box 77 \ 4 scan0233 | |
| Goshawk car's severe overheating test and an investigation into cylinder head material failures. | 13th Jun 1922 | Box 77 \ 4 scan0234 | |
| Investigation into cracked cylinder heads, suggesting the material or its condition is the likely cause. | 13th Jun 1922 | Box 77 \ 4 scan0235 | |
| Modifications to the Goshawk 11 cylinder head to reduce the liability of cracking when running without water. | 13th Jun 1922 | Box 77 \ 4 scan0236 | |
| Production schedule for a modified wooden radiator and bonnet for a Goshawk 11. | 16th Jun 1922 | Box 77 \ 4 scan0237 | |
| Proposed modifications to the Goshawk bonnet and radiator dimensions. | 6th Jun 1922 | Box 77 \ 4 scan0238 | |
| Sending a 3-Goshawk-11 limousine to London and detailing modifications to its pedals, steering, radiator, and bonnet. | 19th Jun 1922 | Box 77 \ 4 scan0239 | |
| Tests on a Goshawk engine's cooling system when started with insufficient water. | 19th Jun 1922 | Box 77 \ 4 scan0240 | |
| Arrangements for Mr. Royce to test the Goshawk limousine with a new dummy radiator and bonnet. | 20th Jun 1922 | Box 77 \ 4 scan0241 | |
| Suggested modifications to the radiator's dimensions on a 3-Goshawk-II Limousine. | 21th Jun 1922 | Box 77 \ 4 scan0242 | |
| Telegram requesting mufflers for a Goshawk engine to be sent by passenger train for a trial in London. | 22th Jun 1932 | Box 77 \ 4 scan0243 | |
| Weight difference between two 'Goshawk' II radiators from a supplier. | 6th Jun 1922 | Box 77 \ 4 scan0244 | |
| Letter from Orme, Evans & Co. Ltd. explaining a weight difference in two supplied radiators. | 23th Jun 1922 | Box 77 \ 4 scan0245 | |
| Goshawk engine performance and a proposal to test a new carburettor arrangement for future engine designs. | 23th Jun 1922 | Box 77 \ 4 scan0246 | |
| Design updates and blueprints for the Goshawk radiator, fan, and cowling, pending approval from Mr. Royce. | 28th Jun 1922 | Box 77 \ 4 scan0247 | |
| Continued letter discussing adjustments to a cylinder block and the status of related blueprints. | 17th Jul 1922 | Box 77 \ 4 scan0248 | |
| Requesting the acquisition of Sylphon thermostats for Goshawk radiator louvres. | 17th Jul 1922 | Box 77 \ 4 scan0249 | |
| Drawings for the Goshawk radiator and shutters, cancelling previous versions. | 22th Jul 1922 | Box 77 \ 4 scan0250 | |
| Producing a sample of temporary shutters for the Goshawk radiator for design approval. | 25th Jul 1922 | Box 77 \ 4 scan0251 | |
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