| Description | Date | Identifier | |
| Proposed improvements to the condensers for the 20.HP model. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan12 | |
| Performance of tulip-shaped valves versus conical-faced valves and outlining future testing plans. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan13 | |
| Dimensional discrepancies of sample spanners and suggested corrections to the production dies. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan14 | |
| Design and material for improved valves for car engines, proposing a 30 degree face angle. | 20th Jun 1923 | West Wittering \ K \ June1923 Scan15 | |
| Design options for front axle radius rods and associated components. | 20th Jun 1923 | West Wittering \ K \ June1923 Scan16 | |
| Mr. Royce's feedback on the Spare Wheel Carrier Dust Cover, requesting it be remade from black-enamelled sheet aluminium due to the current version being too heavy. | 20th Jun 1923 | West Wittering \ K \ June1923 Scan17 | |
| Mr. Royce's feedback on design features, including tool storage and sloping screens, for a Beatonson All-Weather Body. | 21th Jun 1923 | West Wittering \ K \ June1923 Scan18 | |
| Proposed improvements and standardization of the Goshawk Magneto. | 1st Jun 1923 | West Wittering \ K \ June1923 Scan19 | |
| Modifications and specifications for the 20 HP chassis headlamps. | 22th Jun 1923 | West Wittering \ K \ June1923 Scan20 | |
| From 'R' to 'HS' discussing running issues with the 4.G.11 Goshawk 11 engine, including a sticking air valve and noisy gears. | 25th Jun 1923 | West Wittering \ K \ June1923 Scan21 | |
| Causes of and solutions for backlash and noise in Goshawk engine half time gears. | 25th Jun 1923 | West Wittering \ K \ June1923 Scan22 | |
| Investigation into gear knocks on the Goshawk 11 engine, proposing experiments with gear slack. | 25th Jun 1923 | West Wittering \ K \ June1923 Scan23 | |
| Concerns about features on cars from Springfield, particularly wheel and tyre specifications. | 6th Jun 1923 | West Wittering \ K \ June1923 Scan24 | |
| Final construction details and timeline for a 20.HP All Weather Car. | 28th Jun 1923 | West Wittering \ K \ June1923 Scan25 | |
| Uncertain position of the magneto bracket for a 20.HP chassis, specifically for Goshawk models with L.H. steering. | 29th Jun 1923 | West Wittering \ K \ June1923 Scan26 | |
| Secret memorandum discussing the current requirements and winding design for a starter motor. | 29th Jun 1923 | West Wittering \ K \ June1923 Scan27 | |
| From Mr. Royce requesting an experimental trial of a vacuum pump for the 40/50 petrol feed system. | 30th Jun 1923 | West Wittering \ K \ June1923 Scan28 | |
| Oil being flung from the Goshawk 11 propeller shaft universal joint. | 1st Jun 1923 | West Wittering \ K \ June1923 Scan29 | |
| Preliminary report on investigations into dynamo regulation, brush sparking, and commutator tests. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan30 | |
| Experimental silent starter motor actuation scheme on chassis 6EX. | 2nd Jun 1923 | West Wittering \ K \ June1923 Scan31 | |
| The development of an engine starting system, discussing its performance, advantages, and future application. | 2nd Jun 1923 | West Wittering \ K \ June1923 Scan32 | |
| Circuit diagram for a starter motor actuation system. | 9th Sep 1920 | West Wittering \ K \ June1923 Scan33 | |
| Tests on a Goshawk steering wheel for the 6-MX car, which caused irritating shocks, and a recommendation based on test results. | 1st Jun 1923 | West Wittering \ K \ June1923 Scan34 | |
| Tests about the effect of tyre pressures on maximum speed. | 1st Jun 1923 | West Wittering \ K \ June1923 Scan35 | |
| Tests conducted to determine the effect of tyre pressures on the performance of the 40/50 model. | 1st Jun 1923 | West Wittering \ K \ June1923 Scan36 | |
| Tyre tests, checking road figures related to speed, tractive resistance, and fuel consumption. | 1st Jun 1923 | West Wittering \ K \ June1923 Scan37 | |
| The small percentage difference in petrol consumption between different tyre pressures. | 1st Jul 1923 | West Wittering \ K \ June1923 Scan38 | |
| Graph showing the effect of tyre deflation on tractive resistance at various speeds using well-worn Canadian Dunlop Cord tyres. | 1st Jul 1923 | West Wittering \ K \ June1923 Scan39 | |
| Visit from the British Lighting & Ignition Company regarding a new voltage regulator system. | 9th Jun 1923 | West Wittering \ K \ June1923 Scan40 | |
| Hand-drawn circuit diagram for a DC motor. | 11th Jun 1923 | West Wittering \ K \ June1923 Scan41 | |
| Seeking clarification on whether a new brush holder design is for the E.A.C. dynamo or the 20 HP brush gear. | 11th Jun 1923 | West Wittering \ K \ June1923 Scan42 | |
| Proposing a test for the quality of electrical contacts carrying high-frequency currents using an oscillatory circuit. | 11th Aug 1923 | West Wittering \ K \ June1923 Scan43 | |
| The causes of noise from sliding electrical contacts and a proposed test for the microphonic effect. | 11th Jun 1923 | West Wittering \ K \ June1923 Scan44 | |
| Repair and installation of a new engine in a 4-Goshawk-11 car. | 11th Jun 1923 | West Wittering \ K \ June1923 Scan45 | |
| Technical report on the investigation and specifications of a Scintilla dynamo and regulator. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan46 | |
| Specifications and analysis of a machine's electrical components and construction. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan47 | |
| Performance analysis of a machine's electrical output at various temperatures and speeds. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan48 | |
| Performance comparison against a post-war R.Bosch machine and a description of a three-component regulator unit. | 1st Jun 1923 | West Wittering \ K \ June1923 Scan49 | |
| Description of the function of different coils within a cutout, auxiliary relay, and regulator system. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan50 | |
| Continued description and criticism of an electrical system's operation, referencing volt-speed curves. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan51 | |
| Analysis of an auxiliary relay's voltage characteristics, hysteresis loop, and potential risk to lamps. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan52 | |
| Continued report page discussing voltage regulation performance and comparing it with Bosch, Bijur, and Tirrill systems. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan53 | |
| Technical explanation of current regulation in a dynamo-battery circuit, detailing the interaction of series and shunt coils. | 2nd Jun 1923 | West Wittering \ K \ June1923 Scan54 | |
| Comparison of a Scintilla electrical unit's performance against an R. Bosch system, noting issues with operating voltages and complexity. | 12th Jun 1933 | West Wittering \ K \ June1923 Scan55 | |
| The desirability of a regulator system for the chassis, comparing various manufacturers' units. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan56 | |
| Wiring diagram for a Scintilla Dynamo Regulator System. | 23th Jan 1923 | West Wittering \ K \ June1923 Scan57 | |
| Graph plotting the open-circuit volt-speed characteristics for a Scintilla Dynamo, with and without a vibrator regulator. | 12th Jun 1928 | West Wittering \ K \ June1923 Scan58 | |
| Performance curves of plain shunt-wound dynamos showing volts and amperes vs. speed under hot and cold conditions. | 23th Nov 1920 | West Wittering \ K \ June1923 Scan59 | |
| Comparison report on the stability and top-heaviness of a Maythorn Saloon versus a standard Hooper Limousine on a 20 HP chassis. | 1st Jun 1923 | West Wittering \ K \ June1923 Scan60 | |
| The methodology for tests to determine the centre of gravity for various car types. | 31th May 1925 | West Wittering \ K \ June1923 Scan61 | |
| Report page detailing the methodology of experiments comparing different Goshawk-11 car models. | 31th May 1925 | West Wittering \ K \ June1923 Scan62 | |
| Table detailing the Centre of Gravity and total weight for Goshawk-11 car models with different coachwork. | 5th Jun 1923 | West Wittering \ K \ June1923 Scan63 | |
| Report estimating the weight of the car roofs for two Goshawk models, a Saloon and a Limousine. | 5th Jun 1923 | West Wittering \ K \ June1923 Scan64 | |
| Comparison of roof specifications for Saloon and Limousine Goshawk-11 models. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan65 | |
| Weight comparison and analysis between the 3-Goshawk-11 and 7-Goshawk-11 models. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan66 | |
| Calculation of the theoretical cornering speeds at which a touring car and a bodied car would overturn. | 14th Jun 1923 | West Wittering \ K \ June1923 Scan67 | |
| Improving 20 HP car shock absorbers by changing to a single-stage setting. | 14th Jun 1923 | West Wittering \ K \ June1923 Scan68 | |
| Design issues with a butterfly valve in the exhaust pipe, focusing on seizing and rattling problems. | 14th Jun 1923 | West Wittering \ K \ June1923 Scan69 | |
| Commutation issues and potential improvements for a 20 HP dynamo. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan70 | |
| Calculations and specifications for an E.A.C. Starter Motor. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan71 | |
| Different winding arrangements for a starter motor experiment. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan72 | |
| Calculations for an E.A.C. starter motor's torque, speed, and power requirements. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan73 | |
| Design calculations for an electric motor armature, including torque, flux, conductor, and slot specifications. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan74 | |
| Calculations for motor electrical properties, including back E.M.F. and resistance. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan75 | |
| Page of calculations for armature resistance, dimensions, and slot area. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan76 | |
| Page of calculations for an armature and field winding. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan77 | |
| Calculation table for ampere-turns required to produce magnetic flux. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan78 | |
| Calculation for the cross-sectional area of a strip and its equivalent wire gauge. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan79 | |
| Comparing the hill-climbing capabilities of the 40/50 and 20 HP models. | 21th Jun 1923 | West Wittering \ K \ June1923 Scan80 | |
| Comparison of climbing capabilities for the 40/50 HP and 20 HP models. | 16th Apr 1923 | West Wittering \ K \ June1923 Scan81 | |
| Calculation of climbing capabilities for the 40/50 HP and 20 HP engines. | 16th Apr 1923 | West Wittering \ K \ June1923 Scan82 | |
| Page of calculations for power delivery to the rear wheels and power available for hill climbing, accounting for tyre and transmission losses. | 27th Jun 1923 | West Wittering \ K \ June1923 Scan83 | |
| 5000-mile equivalent continuous running bench and commutation test of a 20 HP dynamo. | 27th Jun 1923 | West Wittering \ K \ June1923 Scan84 | |
| Brush wear and commutator condition after a 2500-mile test run, noting issues with mica. | 1st Jun 1923 | West Wittering \ K \ June1923 Scan85 | |
| Commutation and brush wear tests, detailing performance at different loads and conditions. | 27th May 1923 | West Wittering \ K \ June1923 Scan86 | |
| Results of a 5000-mile equivalent test, focusing on brush wear and commutator condition. | 27th Jun 1925 | West Wittering \ K \ June1923 Scan87 | |
| Continuous running tests for a 20 HP Dynamo, focusing on brush and commutator performance when reversing polarity. | 30th Jun 1923 | West Wittering \ K \ June1923 Scan88 | |
| Testing front wheel brakes on a chassis. | 24th Nov 1923 | West Wittering \ K \ November1923 Scan0 | |
| Experimental work on Goshawk dynamos to reduce noise and improve commutation. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan1 | |
| Progress report on tests of bevelling brushes and undercutting commutators on experimental Goshawk cars and dynamos. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan2 | |
| Tests of Lucas E.575 machines, comparing brush wear and armature modifications to reduce dynamo noise. | 11th Nov 1923 | West Wittering \ K \ November1923 Scan3 | |
| Dynamo noise, its relation to bearing tightness, and a potential solution using a cast iron end bracket. | 11th Nov 1923 | West Wittering \ K \ November1923 Scan4 | |
| The performance of front wheel brakes and steering. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan5 | |
| Testing the parallel control for the front axle on a chassis with 4-wheel brakes. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan6 | |
| Tests conducted on an 8-cylinder Isotta car. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan7 | |
| The performance of an Isotta Fraschini car, covering HP curve, acceleration, and tractive resistance. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan8 | |
| The performance and issues with a car's four-wheel braking system. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan9 | |
| Dynamometer horse power curve data, gear ratios, and ignition specifications. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan10 | |
| Vehicle performance including weight, acceleration, consumption, and hill climb tests. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan11 | |
| Vehicle braking distances under various conditions. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan12 | |
| Graph plotting Horse Power. | 27th Nov 1923 | West Wittering \ K \ November1923 Scan13 | |
| The condition of a 20 HP chassis after a 10,000-mile test. | 7th Nov 1923 | West Wittering \ K \ November1923 Scan14 | |
| The condition of various vehicle components after a test. | 7th Nov 1923 | West Wittering \ K \ November1923 Scan15 | |
| 20 HP car (79-AO) after 10,000 miles, suggesting improvements for various parts. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan16 | |
| Wear measurements for an engine's crankshaft journals, crank pins, and cylinders. | 8th Nov 1923 | West Wittering \ K \ November1923 Scan17 | |
| The inspection and test of the Goshawk electrical system from chassis 79-AO after 10,000 miles. | 8th Nov 1923 | West Wittering \ K \ November1923 Scan18 | |
| Report of inspection and test of electrical units taken from vehicle 79-AO after a 10,000 mile test. | 7th Nov 1923 | West Wittering \ K \ November1923 Scan19 | |
| Inspection report detailing the condition of various electrical components, being page 2 of the document. | 7th Nov 1923 | West Wittering \ K \ November1923 Scan20 | |
| Inspection report on the condition of a dynamo, commutator, armature, and battery. | 7th Nov 1923 | West Wittering \ K \ November1923 Scan21 | |
| Condition report on a battery box, recommending an overhaul of the dynamo and starter motor switch. | 7th Nov 1923 | West Wittering \ K \ November1923 Scan22 | |
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