| Description | Date | Identifier | |
| Design improvements for the Goshawk 11 petrol level indicator, including dial markings and needle assembly. | 9th May 1923 | West Wittering \ J \ May1923 Scan4 | |
| Standardisation and fitting issues of a side wheel carrier for the 40/50 model. | 9th May 1923 | West Wittering \ J \ May1923 Scan5 | |
| The performance of an improved miniature sparking plug and a request for adapters. | 9th May 1923 | West Wittering \ J \ May1923 Scan6 | |
| Chassis improvements for axles, dynamo drives, track width, and brake lever design. | 5th May 1923 | West Wittering \ J \ May1923 Scan7 | |
| Fitting experimental parts to Goshawk cars and the overweight body of a Maythorn saloon. | 15th May 1923 | West Wittering \ J \ May1923 Scan8 | |
| Design specifications and performance requirements for a starter motor. | 16th May 1923 | West Wittering \ J \ May1923 Scan9 | |
| Requesting specific improvements to be fitted to Goshawk vehicles. | 17th May 1923 | West Wittering \ J \ May1923 Scan10 | |
| Outlining reasons for disagreeing with an alteration to the standard valve and wick pattern for clutch spigot lubrication. | 17th May 1923 | West Wittering \ J \ May1923 Scan11 | |
| Requesting standardisation sheets for an oil level indicator instead of a side tank on the 40/50 model to improve the wheel carrier. | 17th May 1923 | West Wittering \ J \ May1923 Scan12 | |
| Confirming the definitive decision to condemn steam cooling technology. | 17th May 1923 | West Wittering \ J \ May1923 Scan13 | |
| Correspondence about replacing a Beatonson body on a 20.HP Goshawk 11 with a new all-weather design. | 5th May 1923 | West Wittering \ J \ May1923 Scan14 | |
| The mounting of RB.71 headlamps onto Goshawk wings, referencing N.scheme 1417. | 18th May 1923 | West Wittering \ J \ May1923 Scan15 | |
| Replacement of a vehicle, referred to as the Goshawk, which has an 'ugly Mulliner body'. | 24th May 1923 | West Wittering \ J \ May1923 Scan16 | |
| Request to urge the production of a sample set of spanners as per drawing LeC. 1645. | 24th May 1923 | West Wittering \ J \ May1923 Scan17 | |
| Suggesting a method for fixing the lubricator for the rear spring roller to avoid fouling the bodywork. | 24th May 1923 | West Wittering \ J \ May1923 Scan18 | |
| Potential improvements and options for instrument board lighting. | 24th May 1923 | West Wittering \ J \ May1923 Scan19 | |
| Requested modifications for a Goshawk 11 car, including a new body and a list of seven specific improvements. | 24th May 1923 | West Wittering \ J \ May1923 Scan20 | |
| Approving the use of Jeavons Spring Gaiters as an alternative to the Wefco type. | 28th May 1923 | West Wittering \ J \ May1923 Scan21 | |
| Sliding coupling scheme for the Goshawk 11 magneto drive. | 29th May 1923 | West Wittering \ J \ May1923 Scan22 | |
| Complaint about oil being flung from the propeller shaft on Goshawk models, staining carpets. | 30th May 1923 | West Wittering \ J \ May1923 Scan23 | |
| Points for consideration and experiment on the dynamo and other electrical equipment, including brush wear, holders, and connectors. | 30th May 1923 | West Wittering \ J \ May1923 Scan24 | |
| Bent push rods on the 20 HP model, specifically regarding insufficient valve spring clearance and incorrect tappet adjustments. | 30th May 1923 | West Wittering \ J \ May1923 Scan25 | |
| Noisy starter on a car used by Mr. Royce, requesting an update on suggested improvements. | 30th May 1924 | West Wittering \ J \ May1923 Scan26 | |
| Clearance issues with the Goshawk 11 tappet adjustment, referencing specific drawings and measurements. | 31th May 1923 | West Wittering \ J \ May1923 Scan27 | |
| Alteration to the Goshawk slipper flywheel, noting an un-discussed reduction in the number of springs. | 31th May 1923 | West Wittering \ J \ May1923 Scan28 | |
| Series of dynamo tests varying the main brush position to determine performance curves. | 3rd May 1923 | West Wittering \ J \ May1923 Scan29 | |
| Analysis of experimental dynamo performance curves and modifications, including tests on various machine configurations. | 3rd May 1923 | West Wittering \ J \ May1923 Scan30 | |
| Page from a report comparing a 140 turn 20 SWG field winding against the standard field winding. | 3rd May 1925 | West Wittering \ J \ May1923 Scan31 | |
| Graph showing the results of main brush position tests on a Goshawk dynamo. | 19th Oct 1933 | West Wittering \ J \ May1923 Scan32 | |
| Graph showing the results of main-brush position tests on a Goshawk Dynamo No. 288. | 27th Apr 1933 | West Wittering \ J \ May1923 Scan33 | |
| Performance graph of main-brush position tests on a Goshawk dynamo, plotting ampere output against dynamo RPM. | 25th May 1933 | West Wittering \ J \ May1923 Scan34 | |
| Graph of main-brush position tests on a Goshawk dynamo, plotting ampere output against RPM. | 29th Mar 1923 | West Wittering \ J \ May1923 Scan35 | |
| Limitations of the vacuum feed system for the 40/50 HP chassis, particularly at high altitudes. | 9th May 1923 | West Wittering \ J \ May1923 Scan36 | |
| Reliability of vacuum and pressure fuel feed systems for automobiles. | 9th May 1923 | West Wittering \ J \ May1923 Scan37 | |
| Table of results for Autovac tests on a standard carburetter and induction pipe. | 9th May 1923 | West Wittering \ J \ May1923 Scan38 | |
| Calculation of the performance of an Autovac fuel system at high altitudes. | 9th May 1923 | West Wittering \ J \ May1923 Scan39 | |
| Graph plotting the results of Autovac tests, showing possible travel distance against engine RPM under various conditions. | 9th May 1923 | West Wittering \ J \ May1923 Scan40 | |
| Tests on the Autovac fuel system, including suction levels and performance graphs. | 9th May 1923 | West Wittering \ J \ May1923 Scan41 | |
| Chart from Autovac tests showing petrol supply variation based on lift height, different fuel levels in the tank and vehicle gradient under full throttle conditions. | 29th May 1923 | West Wittering \ J \ May1923 Scan42 | |
| Arrangement to produce two sample Watford magnetos for the Goshawk ignition system. | 9th May 1923 | West Wittering \ J \ May1923 Scan43 | |
| On the road testing and modification of 20 HP carburation, comparing a modified Goshawk-11 engine to an original Goshawk-1. | 10th Aug 1923 | West Wittering \ J \ May1923 Scan44 | |
| Engine performance improvements, detailing changes in consumption, torque, and acceleration for a 20 HP car. | 10th May 1923 | West Wittering \ J \ May1923 Scan45 | |
| The issues found with a Rushmore Steam Cooling system after a 3000-mile test on a 40/50 car. | 10th May 1923 | West Wittering \ J \ May1923 Scan46 | |
| Friction damping plate working loose on a 20 HP engine's latest type spring drive and a suggested fix. | 10th May 1923 | West Wittering \ J \ May1923 Scan47 | |
| Reliability issues and a new design for the 40/50 HP clutch spigot lubrication. | 10th May 1923 | West Wittering \ J \ May1923 Scan48 | |
| Blueprint detailing the oiling arrangement for a clutch bearing. | 15th Mar 1923 | West Wittering \ J \ May1923 Scan49 | |
| The performance of Bijur electrical units after 17,300 miles, detailing issues with voltage regulators. | 10th May 1923 | West Wittering \ J \ May1923 Scan50 | |
| The failure of intermediate bearings in a 20 HP engine using a larger crankshaft, recommending further testing. | 10th May 1923 | West Wittering \ J \ May1923 Scan51 | |
| Cover note for horsepower charts for the Goshawk and 40/50 chassis, replacing previous curves. | 1st May 1923 | West Wittering \ J \ May1923 Scan52 | |
| Graph comparing M.E.P. and Horse Power curves for Goshawk II and 40/50 engines from bench and dynamometer tests. | 14th Feb 1923 | West Wittering \ J \ May1923 Scan53 | |
| Positioning of a 40/50 spare wheel carrier on a 6-EX car. | 14th May 1923 | West Wittering \ J \ May1923 Scan54 | |
| The dispatch and testing of Miniature Lodge Sparking Plugs. | 14th May 1923 | West Wittering \ J \ May1923 Scan55 | |
| Testing Jeavons Spring Gaiters as an alternative to those supplied by the Wefco Co. | 16th May 1923 | West Wittering \ J \ May1923 Scan56 | |
| Visit from a Dunlop engineer to demonstrate new low-pressure tyres on a Rover and a Cadillac. | 16th May 1923 | West Wittering \ J \ May1923 Scan57 | |
| Testing new Dunlop tyres and wheels on 20 HP and 40/50 HP models. | 16th May 1923 | West Wittering \ J \ May1923 Scan58 | |
| Test report on the comparative wear of case-hardened versus bronze bushes for spring shackles on a Goshawk-11 car. | 16th May 1923 | West Wittering \ J \ May1923 Scan59 | |
| The bench and road tests of 'Pynol' fuel, a German-developed mixture of petrol and gas oil. | 16th May 1923 | West Wittering \ J \ May1923 Scan60 | |
| The performance of 'Pynol' fuel compared to petrol in road and bench tests. | 15th May 1923 | West Wittering \ J \ May1923 Scan61 | |
| Bench tests on a Goshawk engine comparing Petrol and Pynol fuels. | 15th May 1923 | West Wittering \ J \ May1923 Scan62 | |
| Road tests comparing 'Pynol' motor fuel with Petrol in a 40/50 car. | 15th May 1923 | West Wittering \ J \ May1923 Scan63 | |
| Hill climbing performance test results comparing Petrol and Pynol fuels on Pistem Hill. | 15th May 1923 | West Wittering \ J \ May1923 Scan64 | |
| Graph comparing the performance and consumption of Petrol and Pynol fuels in a Goshawk engine. | 15th May 1923 | West Wittering \ J \ May1923 Scan65 | |
| Graph of fuel tests showing the distillation curves and chemical analysis for Pynol and Shell No. 1 fuels. | 24th May 1923 | West Wittering \ J \ May1923 Scan66 | |
| Proposing modifications to the 40/50 HP gearbox for easier oil level checking and filling. | 24th May 1923 | West Wittering \ J \ May1923 Scan67 | |
| Potential damage to the 20 HP electrical system when running without a battery and the proposed solutions. | 24th May 1923 | West Wittering \ J \ May1923 Scan68 | |
| Battery ignition failures, their causes, and potential solutions such as instruction book updates or adding a voltage regulating device. | 24th May 1923 | West Wittering \ J \ May1923 Scan69 | |
| Failures in Goshawk ignition condenser connections due to high-frequency currents and manufacturing tolerances. | 26th May 1923 | West Wittering \ J \ May1923 Scan70 | |
| Improving condenser contacts to achieve a more certain metallic connection. | 28th May 1923 | West Wittering \ J \ May1923 Scan71 | |
| Issues with tappet clearance on the 20 HP model and recommending the adoption of the E.A.C. type of tappet adjustment. | 28th May 1923 | West Wittering \ J \ May1923 Scan72 | |
| Comparative performance curves for the Goshawk dynamo. | 28th May 1923 | West Wittering \ J \ May1923 Scan73 | |
| The performance curves and continuous running tests of standard and experimental dynamos. | 28th May 1923 | West Wittering \ J \ May1923 Scan74 | |
| Programme for investigating externally controlled chassis generators. | 28th May 1923 | West Wittering \ J \ May1923 Scan75 | |
| Comparative performance graph of various 'Goshawk' dynamos, plotting ampere output against dynamo RPM. | 28th May 1923 | West Wittering \ J \ May1923 Scan76 | |
| The contents and model construction for a box of small tools and spares for the Goshawk engine. | 11th Nov 1922 | West Wittering \ J \ November1922 Scan0 | |
| P.&R. battery for the 40/50 model, focusing on capacity versus weight and charging solutions. | 11th Nov 1922 | West Wittering \ J \ November1922 Scan1 | |
| Enquiry for a simple rectifier and opinions on battery size. | 6th Aug 1919 | West Wittering \ J \ November1922 Scan2 | |
| Solutions for noise issues with spring shackles and front horns, proposing the use of hardened steel washers. | 6th Nov 1922 | West Wittering \ J \ November1922 Scan3 | |
| Telegram suggesting an experimental modification to the Goshawk engine ignition system. | 9th Nov 1922 | West Wittering \ J \ November1922 Scan4 | |
| Post office telegram confirmation discussing a fault, suggesting mahogany or teak wood dust as a material and checking for induction or leakage. | 9th Nov 1922 | West Wittering \ J \ November1922 Scan5 | |
| Telegram from Royce requesting clarification on the cause of the 'Goshawk phenomenon'. | 10th Nov 1922 | West Wittering \ J \ November1922 Scan7 | |
| Reduced insulating properties of bakelite at increased temperatures in a Goshawk coil. | 10th Nov 1922 | West Wittering \ J \ November1922 Scan8 | |
| Proposed methods for improving the Goshawk's side steering tube pendulum joint. | 11th Nov 1922 | West Wittering \ J \ November1922 Scan9 | |
| Modification to the 40/50 front wheel brakes with a pull-off spring. | 11th Nov 1922 | West Wittering \ J \ November1922 Scan10 | |
| Modifications to the 40/50 front wheel brakes and steering lever. | 11th Nov 1922 | West Wittering \ J \ November1922 Scan11 | |
| New scheme (N.sch. 1344) for a modified front axle fitted with front wheel brakes for the Goshawk 11 model. | 11th Nov 1922 | West Wittering \ J \ November1922 Scan12 | |
| Mr. Royce's disapproval of a Lucas scheme for carrying spare lamp bulbs for the Goshawk 11. | 11th Nov 1922 | West Wittering \ J \ November1922 Scan13 | |
| Electrostatic and dielectric losses in the Goshawk Ignition Coil and the choice of materials for its casing. | 11th Nov 1922 | West Wittering \ J \ November1922 Scan14 | |
| Coil insulation materials and sparking plug experiments for the Goshawk engine. | 11th Aug 1920 | West Wittering \ J \ November1922 Scan15 | |
| Coil failures, suggesting improved insulation using ebonite or stabilite tubing and isolating it from metal components. | 11th Aug 1920 | West Wittering \ J \ November1922 Scan16 | |
| Suggestions for the design of Goshawk and other battery ignition systems to prevent energy loss. | 13th Nov 1922 | West Wittering \ J \ November1922 Scan17 | |
| Technical discussion on testing ignition coil materials and suggesting modifications to improve insulation and reduce energy loss. | 11th Aug 1920 | West Wittering \ J \ November1922 Scan18 | |
| Request for comparative data on Stabilite and Mouldensite coils to establish a standard figure of merit. | 11th Aug 1920 | West Wittering \ J \ November1922 Scan19 | |
| Approval process for standardisation sheets, specifically for the deletion of a reverse trigger and a generator drive brake. | 14th Nov 1922 | West Wittering \ J \ November1922 Scan20 | |
| Proposal to fit a standby magneto ignition on the 20 HP car for foreign markets. | 14th Nov 1922 | West Wittering \ J \ November1922 Scan21 | |
| The preference for magneto ignition over battery ignition and its implementation. | 15th Nov 1922 | West Wittering \ J \ November1922 Scan22 | |
| From RS to HS confirming Mr. Royce's agreement on a change speed lever design. | 15th Nov 1922 | West Wittering \ J \ November1922 Scan23 | |
| Improvements to a Goshawk 11 battery ignition coil to reduce energy leakage. | 15th Nov 1922 | West Wittering \ J \ November1922 Scan24 | |
| Improving engine wiring, coil design, and materials to reduce self-induction. | 11th Aug 1920 | West Wittering \ J \ November1922 Scan25 | |
| Standardisation sheets for vehicle components like ignition units, handles, and gears. | 15th Nov 1922 | West Wittering \ J \ November1922 Scan26 | |
| Telegram about testing a 'Goslank' coil to determine the advantages of 'hedgehogging' the core. | 11th May 1922 | West Wittering \ J \ November1922 Scan27 | |
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