| Description | Date | Identifier | |
| Instruction to test if a radiator fan with three blades performs as well as one with six on the 40/50 HP model. | 5th Jun 1919 | Box 75 \ 3 scan0161 | |
| 20 HP fan and fan pulley, referencing drawing No. Lec.1108. | 3rd Jul 1919 | Box 75 \ 3 scan0162 | |
| Cheaper-to-produce sheet metal fan design for the 20 HP chassis, referencing drawing LeC.1113. | 26th Jul 1919 | Box 75 \ 3 scan0163 | |
| Comparison test results for a 3-bladed fan versus a standard 6-bladed fan on a 40/50 chassis. | 26th Nov 1919 | Box 75 \ 3 scan0164 | |
| Test results comparing maximum temperatures for 3-bladed and 6-bladed fans during hill climb and level running tests. | 26th Nov 1919 | Box 75 \ 3 scan0165 | |
| Accompanying drawing LeC.1388 for the 'Goshawk II' fan and bracket. | 21th Apr 1940 | Box 75 \ 3 scan0166 | |
| Alteration to the fan pulley and increasing the fan size for the Goshawk 11 chassis. | 8th Oct 1921 | Box 75 \ 3 scan0167 | |
| Design changes for the Goshawk II engine's wheelcase, gearing, and fan. | 13th Oct 1921 | Box 75 \ 3 scan0168 | |
| Alterations to the fan, radiator, and flywheel assembly as per Mr. Royce's instructions. | 13th Oct 1921 | Box 75 \ 3 scan0169 | |
| Recommendation to lengthen the fan pulley adjustment nut on the fan drive bracket to improve accessibility. | 21th Oct 1921 | Box 75 \ 3 scan0170 | |
| Design changes to the Goshawk 11 carburetter silencer and control gear. | 29th Oct 1921 | Box 75 \ 3 scan0171 | |
| Recommendation to provide fan lubrication using an 'ENOTS' Lubricator. | 15th Nov 1921 | Box 75 \ 3 scan0172 | |
| Proposed fan cowling for the Goshawk 11 engine and the potential for increased noise. | 2nd Mar 1922 | Box 75 \ 3 scan0173 | |
| Continued testing and fan belt issues of the G-Goshawk-11 car. | 22th May 1922 | Box 75 \ 3 scan0174 | |
| Mileage, engine misfire due to a stretched valve, loose spring clips, poor quality fan belts, and a broken thermometer on a test car. | 18th May 1922 | Box 75 \ 3 scan0175 | |
| The design of a larger fan and radiator modifications for the Goshawk 11. | 30th May 1922 | Box 75 \ 3 scan0176 | |
| New fan fixture design for the Goshawk engine, putting a hold on related parts. | 21th Jun 1922 | Box 75 \ 3 scan0177 | |
| Recommendation to use a short-link fan belt for the Goshawk 11. | 19th Jul 1922 | Box 75 \ 3 scan0178 | |
| Query regarding the production finish for the 'GOSHAWK II' Fan Hub and Blades. | 21th Aug 1922 | Box 75 \ 3 scan0179 | |
| From 'E' forwarding a request from Mr. Royce to test the Goshawk 11 cowling under full power road conditions. | 1st Sep 1922 | Box 75 \ 3 scan0180 | |
| Comparison of wind velocity tests on Goshawk fans with different configurations and engine speeds. | 28th Sep 1922 | Box 75 \ 3 scan0181 | |
| Drawings for a spring-mounted fan for the Goshawk 11. | 28th Sep 1922 | Box 75 \ 3 scan0182 | |
| Querying whether a specific spring-mounted 18-inch fan should be fitted to the first 20 Goshawk II cars. | 4th Oct 1922 | Box 75 \ 3 scan0183 | |
| Water temperature test results for the Goshawk 11 engine under various cooling configurations on Swinscoe Hill. | 26th Oct 1922 | Box 75 \ 3 scan0184 | |
| Goshawk 11 engine temperature test results under various fan and cowling configurations. | 26th Oct 1922 | Box 75 \ 3 scan0185 | |
| Water temperature test results for the Goshawk II engine on Swinscoe Hill under various fan, cowling, and shutter configurations. | 26th Oct 1922 | Box 75 \ 3 scan0186 | |
| Data table comparing atmospheric and water temperatures under different engine cooling configurations. | 23th Nov 1922 | Box 75 \ 3 scan0187 | |
| Confirming all production Goshawks will have a larger fan with a spring-tightened fan belt. | 23th Nov 1922 | Box 75 \ 3 scan0188 | |
| Omission of an untested automatic spring adjustment for the Goshawk 11 engine fan. | 27th Nov 1922 | Box 75 \ 3 scan0189 | |
| New arrangement to drive the fan from the dynamo on the Goshawk engine. | 1st Dec 1922 | Box 75 \ 3 scan0190 | |
| Modification for the Goshawk 11 engine's fan, driven from the dynamo drive, to reduce gear noise. | 7th Dec 1922 | Box 75 \ 3 scan0191 | |
| Query regarding which of two springs, E.52284 and E.52285, should be used for production of the Goshawk II fan. | 28th Mar 1923 | Box 75 \ 3 scan0192 | |
| Standardisation of a spring tension mechanism for fan belt adjustment. | 26th Feb 1923 | Box 75 \ 3 scan0193 | |
| Cost implications of implementing a fan belt adjustment alteration at different stages of production. | 6th Mar 1923 | Box 75 \ 3 scan0194 | |
| Requesting severe testing of a new special endless and jointless 20HP fan belt from Messrs. Ormerod & Co. to solve booming issues. | 16th Apr 1923 | Box 75 \ 3 scan0195 | |
| The performance and failure of an Ormerod endless fan belt during testing. | 30th Apr 1923 | Box 75 \ 3 scan0196 | |
| Modification to the fan drive for the Goshawk engine. | 26th Apr 1923 | Box 75 \ 3 scan0197 | |
| Parts required for a fan drive from a dynamo drive. | 1st May 1923 | Box 75 \ 3 scan0198 | |
| The failure of a special fan belt during testing and its return to the sender. | 2nd May 1923 | Box 75 \ 3 scan0199 | |
| Telegram received by telephone from Royce awaiting a decision on drive preference. | 19th Jul 1923 | Box 75 \ 3 scan0200 | |
| Fan belt irregularity and mounting solutions for the Goshawk 11 engine. | 21th Jul 1923 | Box 75 \ 3 scan0201 | |
| Series of graphs comparing belt drive performance, spring tensions, and the effect of temperature on belt slip. | 25th Jul 1923 | Box 75 \ 3 scan0202 | |
| Two graphs comparing fan drive pulley performance against engine RPM, and fan drive control systems. | 25th Jul 1923 | Box 75 \ 3 scan0203 | |
| Slight revision to the Goshawk II fan pulley and spring drive. | 16th Aug 1923 | Box 75 \ 3 scan0204 | |
| Complaint about the new Fan Drive E.52560 on the 20 HP Chassis. | 30th Aug 1923 | Box 75 \ 3 scan0205 | |
| New, improved endless leather vee-type fan drive belts from supplier Messrs. Ormerod for the 20HP model. | 28th Sep 1923 | Box 75 \ 3 scan0206 | |
| Agreeing to a suggestion from the Tool Dept. to make the pivot and spindle for the fan drive a one-piece forging. | 16th Oct 1923 | Box 75 \ 3 scan0207 | |
| Bench experiments to determine the optimal blade shape for 20 HP radiator fans made from sheet material. | 1st Feb 1925 | Box 75 \ 3 scan0208 | |
| Continued testing and comparison of different fan designs, including modifications and results. | 1st Feb 1925 | Box 75 \ 3 scan0209 | |
| Experiments on various fan designs, analysing blade shape, curves, and overall performance. | 1st Feb 1925 | Box 75 \ 3 scan0210 | |
| The merits of high versus low speed engine fans and their drive ratios. | 1st Feb 1925 | Box 75 \ 3 scan0211 | |
| Analysis of cooling fan performance comparing a new experimental fan to the present standard model. | 9th Feb 1925 | Box 75 \ 3 scan0212 | |
| Comparison of thrust and power requirements for various 20 HP fans. | 9th Feb 1925 | Box 75 \ 3 scan0213 | |
| Performance graph comparing fan speed and power required versus axial thrust for Hispano and Goshawk fan modifications. | 3rd Feb 1925 | Box 75 \ 3 scan0214 | |
| Graph comparing the thrust and power of different engine fans against fan speed. | 9th Feb 1925 | Box 75 \ 3 scan0215 | |
| Data sheet detailing power requirements and thrust measurements for a Goshawk 4-blade fan with an experimental modification. | 4th Jan 1925 | Box 75 \ 3 scan0216 | |
| Data table showing calculations for Test No. 2. | 31th Dec 1924 | Box 75 \ 3 scan0217 | |
| Test data on the power required to drive a Goshawk No. 2 radiator fan with modified blades. | 5th Jan 1925 | Box 75 \ 3 scan0218 | |
| Calculations from Test No. 22 for the Goshawk engine. | 31th Dec 1924 | Box 75 \ 3 scan0219 | |
| Test results for the power required to drive a Goshawk radiator fan under various circumstances. | 6th Jan 1925 | Box 75 \ 3 scan0220 | |
| Data table of calculations for Test No. 8 on a Goshawk engine. | 31th Dec 1924 | Box 75 \ 3 scan0221 | |
| Data table showing the power required to drive a Goshawk engine radiator fan under various conditions. | 6th Jan 1925 | Box 75 \ 3 scan0222 | |
| Data table of calculations from Test No. 24 for the Goshawk engine. | 31th Dec 1924 | Box 75 \ 3 scan0223 | |
| Test data table showing power required to drive a 2nd Goshawk radiator fan under various circumstances. | 13th Jan 1925 | Box 75 \ 3 scan0224 | |
| Tabulated log of calculations for Test No. 25, continued. | 22th Jan 1925 | Box 75 \ 3 scan0225 | |
| Test data for power required to drive a Goshawk radiator fan under various circumstances. | 22th Jan 1925 | Box 75 \ 3 scan0226 | |
| Continuation of Test No. 26 calculations in a tabular format. | 2nd Feb 1925 | Box 75 \ 3 scan0227 | |
| Test report detailing the power required to drive a radiator fan under various circumstances. | 2nd Feb 1925 | Box 75 \ 3 scan0228 | |
| Continuation of calculations for Test No. 27, detailing electrical performance measurements in a table. | 31th Jan 1925 | Box 75 \ 3 scan0229 | |
| Test results table for the power required to drive a radiator fan under various circumstances. | 3rd Feb 1925 | Box 75 \ 3 scan0230 | |
| Continuation of Test No. 27 showing calculation results in a table. | 31th Jan 1925 | Box 75 \ 3 scan0231 | |
| Article from 'The Autocar' magazine discussing the effects of frame distortion on engine and gearbox wear. | 4th Mar 1911 | Box 75 \ 3 scan0232 | |
| The effectiveness of struts fitted to the frame to avoid door rattles. | 5th Dec 1911 | Box 75 \ 3 scan0233 | |
| Agreement to re-fit car doors with struts to cure rattling and arrange for road tests. | 5th Dec 1911 | Box 75 \ 3 scan0234 | |
| Sketch showing the measured deflection of a component at various points without struts fitted. | 5th Dec 1911 | Box 75 \ 3 scan0235 | |
| Record of tests and modifications for a 12-inch deep frame. | 14th Dec 1911 | Box 75 \ 3 scan0236 | |
| Report card detailing work carried out on a chassis frame and body fitting. | 12th Apr 1912 | Box 75 \ 3 scan0237 | |
| Introduction of a deeper frame, its weight, cost, and potential for lightening through drilling. | 12th Apr 1912 | Box 75 \ 3 scan0238 | |
| Continuing tests with a 12' frame and a new 9' frame for improved stiffness. | 14th Aug 1918 | Box 75 \ 3 scan0239 | |
| Standardizing to a 9-inch frame over a 12-inch frame, considering tests, rigidity, and production implications. | 15th Apr 1912 | Box 75 \ 3 scan0240 | |
| Record card detailing the consideration, comparison, and eventual dismantling of 9' frames. | 18th Sep 1912 | Box 75 \ 3 scan0241 | |
| Departmental memo relaying a telegram from Mr Royce approving 9' frames with 1/8 inch metal for model 2100. | 25th Apr 1912 | Box 75 \ 3 scan0242 | |
| Containing a telegram from Mr. Royce about frame and fly-wheel design for series 2100. | 29th Apr 1912 | Box 75 \ 3 scan0243 | |
| The details and potential use of new frame trusses from France and the ongoing testing of a 12-inch frame. | 3rd May 1912 | Box 75 \ 3 scan0244 | |
| Record card for front wing gauges. | 10th Jul 1912 | Box 75 \ 3 scan0245 | |
| Fitting of deep frames and trusses to various chassis, including updates on body fitting and testing. | 20th May 1912 | Box 75 \ 3 scan0246 | |
| Adoption of Aluminium Wing Gauges F 2492 as a standard. | 27th Aug 1912 | Box 75 \ 3 scan0247 | |
| Departmental memo discussing whether to use old stock or commence with a new type of front wing gauges. | 28th Aug 1912 | Box 75 \ 3 scan0248 | |
| Wing gauges, recommending their adoption as standard for L to E cars. | 30th Aug 1912 | Box 75 \ 3 scan0249 | |
| Seeking advice on the standardization of front wing gauges for L to E cars. | 30th Aug 1912 | Box 75 \ 3 scan0250 | |
| The decision to dismantle a 12' frame and requests for test results on other frames. | 18th Sep 1912 | Box 75 \ 3 scan0251 | |
| An account of tweaking a 12' frame during a test in 1926. | 1st Jan 1926 | Box 75 \ 3 scan0252 | |
| Broken front tubular cross member from chassis 1860. | 23th Jan 1913 | Box 75 \ 3 scan0253 | |
| Departmental memo regarding an investigation into a broken front cross tube. | 23th Jan 1913 | Box 75 \ 3 scan0254 | |
| Internal request to despatch a broken cross tube for Mr. Royce. | 10th Dec 1913 | Box 75 \ 3 scan0255 | |
| Broken front cross tube bracket on chassis 1860 and its relation to a previous failure. | 10th Feb 1913 | Box 75 \ 3 scan0256 | |
| Analysis of chassis component failure, specifically regarding brackets, rivets, and cross tube lugs. | 10th Feb 1913 | Box 75 \ 3 scan0257 | |
| Analysis of a bracket failure leading to side frame twisting and side thrust on the front horns. | 10th Feb 1913 | Box 75 \ 3 scan0258 | |
| Cause of torsion in the front horns and evaluating a proposed solution. | 10th Feb 1913 | Box 75 \ 3 scan0259 | |
| Chassis breakage, suggesting bracket reinforcement, replacing rivets with bolts, and adding a front cross member. | 10th Feb 1913 | Box 75 \ 3 scan0260 | |
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