| Description | Date | Identifier | |
| Technical memo discussing water boiling and cooling system improvements for the 40/50 and Goshawk models. | 10th Aug 1923 | West Wittering \ K \ August1923 Scan3 | |
| Drawing of a steam separator in a water cooling system suggested by Mr Royce. | 10th Aug 1923 | West Wittering \ K \ August1923 Scan4 | |
| From DA to HS requesting a copy of a report on Goshawk cooling. | 11th Aug 1923 | West Wittering \ K \ August1923 Scan5 | |
| New type of brush gear for the 20.HP model. | 11th Aug 1923 | West Wittering \ K \ August1923 Scan6 | |
| Telegram received by telephone requesting a reliable, but not necessarily new, small Condor engine for a motor cycle. | 14th Aug 1922 | West Wittering \ K \ August1923 Scan7 | |
| Telegram received by telephone detailing a proposal for a three-point engine and gearbox suspension system. | 9th Jul 1918 | West Wittering \ K \ August1923 Scan8 | |
| Telegram note regarding flexibility and damping of a flywheel, gearbox, and propeller tube. | 9th Jul 1918 | West Wittering \ K \ August1923 Scan9 | |
| Telegram received by telephone from Royce inquiring about the quick production of springs for a chassis. | 9th Jul 1918 | West Wittering \ K \ August1923 Scan10 | |
| Use of rubber buffers for mounting car bodies to reduce engine and road vibrations. | 15th Aug 1923 | West Wittering \ K \ August1923 Scan11 | |
| Proposed alterations to tyres, including increasing size and reducing air pressure to improve ride comfort. | 15th Aug 1923 | West Wittering \ K \ August1923 Scan12 | |
| Telegram requesting to arrange a viewing of a Goshawk vehicle with larger lamps. | 15th Apr 1923 | West Wittering \ K \ August1923 Scan13 | |
| Outlining comparative cooling tests for the 40/50 and 20HP models. | 16th Aug 1923 | West Wittering \ K \ August1923 Scan14 | |
| Graph and instructions for a standard cooling system test, comparing water loss over time. | 16th Aug 1923 | West Wittering \ K \ August1923 Scan15 | |
| Requesting an update on the main and teazer windings for a starter motor. | 16th Aug 1923 | West Wittering \ K \ August1923 Scan16 | |
| Revision to the Goshawk II engine's fan pulley and spring drive. | 16th Aug 1923 | West Wittering \ K \ August1923 Scan17 | |
| Proposed new 10' headlamps for the Goshawk model and a brief note on the luggage carrier. | 1st Aug 1923 | West Wittering \ K \ August1923 Scan18 | |
| Suggesting revised wording for a warning plate related to the Goshawk electrical system. | 20th Aug 1923 | West Wittering \ K \ August1923 Scan19 | |
| Impressions and objections to a paper on automatic spark advancement. | 21th Aug 1923 | West Wittering \ K \ August1923 Scan20 | |
| Requesting a print of drawing No. LeC.1751 for the Goshawk side change gearbox casing. | 1st Aug 1923 | West Wittering \ K \ August1923 Scan21 | |
| Preferred carburetter settings for power and economy, with a warning about incorrect mixture settings. | 27th Aug 1923 | West Wittering \ K \ August1923 Scan22 | |
| Chassis frame deflections on a Barker phaeton body and proposed experiments for reinforcement. | 28th Aug 1923 | West Wittering \ K \ August1923 Scan23 | |
| Query and response regarding the braking distances and acceleration rate for a 6.EX car. | 28th Aug 1923 | West Wittering \ K \ August1923 Scan24 | |
| Outlining seven suggested tests to improve the Goshawk Bendix drive arrangement. | 28th Aug 1923 | West Wittering \ K \ August1923 Scan25 | |
| Tests and modifications to a Bendix unit in comparison to a Bijur scheme. | 29th Aug 1923 | West Wittering \ K \ August1923 Scan26 | |
| Reviving a scheme for a stainless steel float chamber needle for the 40/50 chassis. | 29th Aug 1923 | West Wittering \ K \ August1923 Scan27 | |
| Ongoing issues and practices concerning American-style clutch oil valves. | 29th Aug 1923 | West Wittering \ K \ August1923 Scan28 | |
| Modifications to Rudge-Whitworth wheels, including issues with friction, tightness, and design comparisons to Dunlop wheels. | 29th Aug 1923 | West Wittering \ K \ August1923 Scan29 | |
| Test results and modifications for the Goshawk 11 electric starter switch. | 30th Aug 1923 | West Wittering \ K \ August1923 Scan30 | |
| Improved type of outside lever on the Goshawk 11 clutch operating shaft. | 1st Aug 1923 | West Wittering \ K \ August1923 Scan31 | |
| Query regarding the design standard and material suitability for a 20.HP rear axle. | 11th Dec 1923 | West Wittering \ K \ December1923 Scan0 | |
| From 'R.' detailing car preferences for a trip to Le Canadel, including models for experimental testing. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan1 | |
| Requesting more specific details about the Hispano-Suiza brakes, particularly the cam and servo mechanism. | 11th Dec 1923 | West Wittering \ K \ December1923 Scan2 | |
| Delaying four-wheel brake designs pending the results of experiments on the epicyclic pressure distributing gear. | 11th Dec 1923 | West Wittering \ K \ December1923 Scan3 | |
| New type of sleeve spring clip with dowel pegs for 40/50 four-wheel brakes. | 14th Dec 1923 | West Wittering \ K \ December1923 Scan4 | |
| New scheme for a front dumb iron, intended to act as a stop on the front shackle in case of spring failure. | 12th Dec 1923 | West Wittering \ K \ December1923 Scan5 | |
| On the design of the front spring rear anchorage for the 40/50 four-wheel brake system. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan6 | |
| Modifications for the 40/50 four-wheel brake system. | 12th Apr 1923 | West Wittering \ K \ December1923 Scan7 | |
| Modifications and completion schedule for a 20.HP. All-Weather car destined for France. | 6th Dec 1923 | West Wittering \ K \ December1923 Scan8 | |
| Letter to James Young & Co. Ltd. requesting modifications to a 20 HP All-Weather car body for Mr. Royce. | 6th Dec 1923 | West Wittering \ K \ December1923 Scan9 | |
| Sketch and notes for an instrument board steady mechanism. | 8th Dec 1923 | West Wittering \ K \ December1923 Scan10 | |
| The design, construction, and fitting of a 20.HP. body underframe suspension. | 8th Dec 1923 | West Wittering \ K \ December1923 Scan11 | |
| Experiment with split shoes and a floating fulcrum for 40/50 front wheel brake shoes. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan12 | |
| Modified design for the four-wheel brakes pressure distributing gear. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan13 | |
| Development of a sequence silent starter system for a large chassis engine. | 10th Dec 1923 | West Wittering \ K \ December1923 Scan14 | |
| Telegram requesting a man be sent immediately to wire an instrument board for the Goshawk project. | 11th Dec 1923 | West Wittering \ K \ December1923 Scan15 | |
| Design and modifications for servo-assisted front and rear brake systems for different chassis models. | 10th Dec 1923 | West Wittering \ K \ December1923 Scan16 | |
| Tests on front axle control using stiffer springs and different configurations. | 11th Dec 1923 | West Wittering \ K \ December1923 Scan17 | |
| Requesting experiments on four-wheel brakes to test variations due to surface conditions and compare Halo and Ferodo materials. | 11th Dec 1923 | West Wittering \ K \ December1923 Scan18 | |
| Proposals for increasing the lock on the front axle for four-wheel brakes. | 12th Dec 1923 | West Wittering \ K \ December1923 Scan19 | |
| Secret internal memo discussing unexpected multiplication results in a servo system. | 13th Dec 1923 | West Wittering \ K \ December1923 Scan20 | |
| Query regarding potential friction losses in the four-wheel brake transmission, specifically the 'servo' connecting lever. | 13th Dec 1923 | West Wittering \ K \ December1923 Scan21 | |
| Rejection of a proposed 'Miles Per Gallon' instrument due to concerns over its complexity and reliability. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan22 | |
| Potential modifications to the 40/50 front wheel brake servo to eliminate snatching and chanking. | 15th Dec 1923 | West Wittering \ K \ December1923 Scan23 | |
| Technical memo discussing the arrangement and mechanics of an improved four-wheel brake system. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan24 | |
| The development and challenges of implementing four-wheel braking systems. | 11th Sep 1920 | West Wittering \ K \ December1923 Scan25 | |
| Hand-drawn diagram of a servo-assisted mechanical linkage system with a suspension link. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan26 | |
| Alterations to a switchbox for the EAC and Goshawk projects. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan27 | |
| Outlining four separate experiments proposed for the 40/50 four-wheel brake system. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan28 | |
| The testing of a 20 HP rear axle gear set with thicker pinion teeth. | 12th Dec 1923 | West Wittering \ K \ December1923 Scan29 | |
| Arrangements for testing an experimental car at Le Canadel, including driver logistics. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan30 | |
| The analysis and comparative results of 20 HP footbrake tests. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan31 | |
| Testing Ferodo brake linings with varying positions on brake shoes. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan32 | |
| Sketches to illustrate the position of Ferodo on brake shoes. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan33 | |
| Sketches illustrating the position of Ferodo brake lining on brake shoes. | 14th Dec 1923 | West Wittering \ K \ December1923 Scan34 | |
| Capacity temperature tests of Gosbank condensers. | 14th Dec 1923 | West Wittering \ K \ December1923 Scan35 | |
| Freezing tests of Goshawk paper condensers. | 28th Nov 1923 | West Wittering \ K \ December1923 Scan36 | |
| The results of condenser tests under various temperature conditions. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan37 | |
| The effect of low temperatures on the capacities of condensers. | 4th Dec 1923 | West Wittering \ K \ December1923 Scan38 | |
| Brake tests on the 40/50 model, focusing on the bedding of shoes and the wrapping action. | 4th Dec 1923 | West Wittering \ K \ December1923 Scan39 | |
| Examination of foot brake shoes on chassis 4EX, showing clearance measurements in thousandths of an inch. | 16th Nov 1923 | West Wittering \ K \ December1923 Scan40 | |
| Examination of ineffective foot brake shoes on chassis 4EX, detailing wear patterns and measurements. | 14th Sep 1923 | West Wittering \ K \ December1923 Scan41 | |
| Comparing the wear properties of air-hardened steel versus C.H.N.S. steel for 20 HP rear axle pinions. | 4th Dec 1923 | West Wittering \ K \ December1923 Scan42 | |
| Print showing a comparison of turning circles for 40/50 and 20 HP models. | 12th Dec 1923 | West Wittering \ K \ December1923 Scan43 | |
| The Knave carburetter and its requirements for the E.A.C. engine. | 5th Dec 1923 | West Wittering \ K \ December1923 Scan44 | |
| Issues with floating fulcrum brakes and tests to reduce jaggering. | 5th Dec 1923 | West Wittering \ K \ December1923 Scan45 | |
| The epicyclic equalizer and pedal pressure tests. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan46 | |
| Technical drawing detailing a Hispano servo shoe, its anchorage, and an adjusting screw. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan47 | |
| Technical drawing of a Hispano Servo mechanism with dimensions and ratios. | 4th Dec 1923 | West Wittering \ K \ December1923 Scan48 | |
| Diagrams and data for Hispano-Suiza front wheel brakes, including cam contour and displacement curves. | 4th Dec 1923 | West Wittering \ K \ December1923 Scan49 | |
| Diagram and explanation of the Hispano-Suiza brake system. | 7th Dec 1923 | West Wittering \ K \ December1923 Scan50 | |
| The performance of a 4-wheel braking system on a 40/50 HP model. | 7th Dec 1923 | West Wittering \ K \ December1923 Scan51 | |
| Proposal to reduce the Ferodo lining on the wrapping shoe. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan52 | |
| The advantages of a suggested method for operating 4-wheel brakes. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan53 | |
| Suggested method for operating a four-wheel servo-assisted braking system. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan54 | |
| Diagram and calculations for a method to operate all four brakes using a servo and direct pressure. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan55 | |
| Tests of 'Halo' brake linings, with a segment in the centre of the shoe only. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan56 | |
| Graph comparing Ferodo and Halo brake linings, showing the effects of temperature. | 8th Dec 1923 | West Wittering \ K \ December1923 Scan57 | |
| Test of Ferodo lined wrapping brake shoes. | 8th Dec 1923 | West Wittering \ K \ December1923 Scan58 | |
| Test comparison table of different brake shoe designs and their performance. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan59 | |
| The performance and wear of 'Shoe X' brake lining, including diagrams of its rolling action. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan60 | |
| Testing floating fulcrum front brakes with jointed shoes. | 1st Dec 1923 | West Wittering \ K \ December1923 Scan61 | |
| Servo mechanism with a table of applied pressure values. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan62 | |
| Comparative tests of Goshawk dynamo brush materials. | 10th Dec 1923 | West Wittering \ K \ December1923 Scan63 | |
| Concluding a test on EGO and EG2 brushes as alternative supplies for the standard Z brushes. | 10th Dec 1923 | West Wittering \ K \ December1923 Scan64 | |
| Test report on Morganite brushes on Goshaw Dynamos. | 7th Dec 1923 | West Wittering \ K \ December1923 Scan65 | |
| Instruction sheet detailing a comparison test of different grades of commutator brushes. | 6th Nov 1918 | West Wittering \ K \ December1923 Scan66 | |
| Tests to determine the friction loss when applying the front brakes. | 10th Dec 1923 | West Wittering \ K \ December1923 Scan67 | |
| Brake pedal pressure distribution for the front brakes only. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan68 | |
| Front brake system performance and mechanical efficiency. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan69 | |
| Modifications to the floating fulcrum brake system using jointed shoes. | 10th Dec 1923 | West Wittering \ K \ December1923 Scan70 | |
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