| Description | Date | Identifier | |
| Remedies for transmission knock and uneven engine firing, including ignition systems and fuel quality. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan11 | |
| Letter discussing issues with Bijur and Lucas dynamos and proposing future chassis be sent to America without them. | 6th Jun 1921 | West Wittering \ G \ June1921 Scan12 | |
| Issues with leaky Exide battery cells, unreliable Lucas cutouts, and engine over-oiling problems. | 8th Jun 1921 | West Wittering \ G \ June1921 Scan13 | |
| Technical memo discussing pistons, clutch over-oiling, and alterations to the induction system. | 8th Jun 1921 | West Wittering \ G \ June1921 Scan14 | |
| Carburettor and throttle design modifications based on experiments. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan15 | |
| Recommendations for American owners on castor oil lubricants and an update on magneto issues and improvements. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan16 | |
| Request for information on the best method for fixing platinum points and other similar materials. | 14th Jun 1921 | West Wittering \ G \ June1921 Scan18 | |
| Accompanying drawing No. LeC.1403 for the Goshawk II bonnet catch. | 9th Jun 1921 | West Wittering \ G \ June1921 Scan19 | |
| Design and placement of a bonnet catch for the Goshawk II. | 14th Jun 1921 | West Wittering \ G \ June1921 Scan20 | |
| Sending drawing LeC.1405 for Dynamos & Motors for the Goshawk I & II and 40 HP Chassis. | 9th Jun 1921 | West Wittering \ G \ June1921 Scan21 | |
| From R. to H.S. and E.F.C. about correspondence with Brolt Limited and arranging an interview. | 9th Jun 1921 | West Wittering \ G \ June1921 Scan22 | |
| Carburettor arrangements and throttle heating methods in response to American complaints. | 11th Jun 1921 | West Wittering \ G \ June1921 Scan23 | |
| 'Goshawk II' engine starting switch, suggesting Bakelite Micarta as an alternative to mica insulation. | 10th Jun 1921 | West Wittering \ G \ June1921 Scan24 | |
| Faults with Watford magnetos and the adoption of a newer sleeve type. | 10th Jun 1921 | West Wittering \ G \ June1921 Scan25 | |
| Advance blueprint for a 40/50 HP carburettor and induction system designed for American conditions. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan26 | |
| Request for an 'Autovac' for a 'Goshawk II' chassis, correcting the subject which originally mentioned a 'Dynamo'. | 6th Jun 1921 | West Wittering \ G \ June1921 Scan27 | |
| Requesting a test of the Smith Type 5S motor for the 'Goshawk II'. | 15th Jun 1921 | West Wittering \ G \ June1921 Scan29 | |
| Specifications and stock availability for Brolt lighting equipment for 40/50 HP and 20 HP models. | 7th Jun 1921 | West Wittering \ G \ June1921 Scan30 | |
| Issues with Exide batteries and considering C.A.V.-Willard batteries as an alternative for installations. | 14th Jun 1921 | West Wittering \ G \ June1921 Scan31 | |
| Analysis and description of the construction of a Delco Packard ignition condenser, including a diagram. | 15th Jun 1921 | West Wittering \ G \ June1921 Scan32 | |
| The design and construction of Goshawk II 'B' and 'D' type dashboards. | 21th Jun 1921 | West Wittering \ G \ June1921 Scan34 | |
| Sending drawing No.Lec.1409, which details a modification to simplify the coring on the 'Goshawk II' crankcase. | 21th Jun 1921 | West Wittering \ G \ June1921 Scan35 | |
| Petrol tank modifications for the '4 EX' model, discussing materials and design improvements. | 24th Jun 1921 | West Wittering \ G \ June1921 Scan36 | |
| Quality and design of carburettor fittings and petrol level indicators for the American market. | 21th Jun 1921 | West Wittering \ G \ June1921 Scan37 | |
| Review of the Bosch Battery Ignition system, its applicability to the current chassis, and suggestions for improvements. | 21th Jun 1921 | West Wittering \ G \ June1921 Scan38 | |
| Technical memo discussing design and performance of a driving spindle, condenser, and low tension contact maker. | 21th Jun 1921 | West Wittering \ G \ June1921 Scan39 | |
| Design and fitting of an ignition governor, coil, ballast resistance, and storage for spares. | 21th Jun 1921 | West Wittering \ G \ June1921 Scan40 | |
| Application of American Bosch ignition systems and the selection of dynamos and switchboxes. | 21th Jun 1921 | West Wittering \ G \ June1921 Scan41 | |
| Sketch of a spigot for an American Bosch battery ignition throttle governor casing on a 40/50 chassis. | 23th Jun 1921 | West Wittering \ G \ June1921 Scan43 | |
| The condition of car 4 EX following its return from America, detailing its overall state, rear springs, and induction pipe modifications. | 20th Jun 1921 | West Wittering \ G \ June1921 Scan44 | |
| Future car carburettor positioning and starting system designs. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan45 | |
| Water temperature control system, including radiator louvres and thermostats, and the Bijur starter motor. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan46 | |
| Technical memo discussing the efficiency of starter motors and issues with the starter press button, Klaxon switch, and dynamo equipment. | 17th Jun 1921 | West Wittering \ G \ June1921 Scan47 | |
| Communication discussing failures in the charging system and proposing a switch to a more reliable Bijur dynamo and regulator. | 17th Jun 1921 | West Wittering \ G \ June1921 Scan48 | |
| Technical memo discussing issues with the Bijur dynamo and distribution board. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan49 | |
| Merits of double versus earthed wiring systems and evaluating a Westinghouse switch box. | 17th Jun 1921 | West Wittering \ G \ June1921 Scan50 | |
| Properties and potential applications of Monel Metal as an alternative to stainless steel in various car parts. | 21th Jun 1921 | West Wittering \ G \ June1921 Scan52 | |
| The progress and outstanding items for the 'Goshawk II' chassis. | 21th Jun 1921 | West Wittering \ G \ June1921 Scan53 | |
| Modifications to rear springs, including new bushings and an abandonment of the cantilever method. | 24th Jun 1921 | West Wittering \ G \ June1921 Scan54 | |
| The results and methodology of starter motor brake efficiency and static torque tests. | 22th Jun 1921 | West Wittering \ G \ June1921 Scan55 | |
| Comparison of an experimental starter motor's performance against the standard production motor. | 22th Jun 1921 | West Wittering \ G \ June1921 Scan56 | |
| Motor temperature conditions and static torque tests for engines. | 22th Jun 1921 | West Wittering \ G \ June1921 Scan57 | |
| Continuation of a report calculating engine torque based on amperes, chain reduction, and motor voltage. | 22th Jun 1921 | West Wittering \ G \ June1921 Scan58 | |
| Graph of performance curves for an experimental starter motor, showing efficiency, voltage, BHP, amperes, and torque against speed. | 20th Dec 1930 | West Wittering \ G \ June1921 Scan59 | |
| Performance graph showing the brake efficiency, speed, voltage, and power of a starter motor against torque. | 6th Jun 1921 | West Wittering \ G \ June1921 Scan60 | |
| Performance graph showing brake efficiency, horsepower, voltage, amperage, and speed against torque for an experimental starter motor. | 23th Jun 1921 | West Wittering \ G \ June1921 Scan62 | |
| Design and potential points of failure for the Goshawk II rear springs. | 14th Nov 1924 | West Wittering \ G \ June1921 Scan63 | |
| Instruction to increase the size and move the petrol tanks for the 'Goshawk II' model. | 22th Jun 1921 | West Wittering \ G \ June1921 Scan64 | |
| The rearrangement of the condenser for the 40/50 HP chassis. | 6th Jun 1921 | West Wittering \ G \ June1921 Scan65 | |
| Drawings for the 'Goshawk II' engine starting switch and pedal. | 21th Jun 1921 | West Wittering \ G \ June1921 Scan66 | |
| Confirming the dispatch of drawings for the Goshawk II's ballast resistance and ignition wiring. | 21th Jun 1934 | West Wittering \ G \ June1921 Scan67 | |
| From 'E' to 'HS' urging action on the 'Goshawk' II Autovac at the request of Mr. Royce. | 1st Jun 1931 | West Wittering \ G \ June1921 Scan68 | |
| The failure and testing of Galli-ator radiator shutters fitted to the 4 EX experimental car. | 23th Jun 1931 | West Wittering \ G \ June1921 Scan69 | |
| The operation of vacuum-operated radiator shutters, detailing issues with leakage and insufficient vacuum at full throttle. | 23th Jun 1921 | West Wittering \ G \ June1921 Scan70 | |
| Comparison of American Foxboro' instrument gauges with existing English gauges for the 4. EX car. | 24th Jun 1921 | West Wittering \ G \ June1921 Scan72 | |
| The decision to adopt standard C.A.V.-Willard batteries, weighing their merits against the convenience of separate cell batteries. | 28th Jun 1921 | West Wittering \ G \ June1921 Scan74 | |
| Cable received from Springfield requesting drawings for a Hives Pilot Jet. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan75 | |
| Suggestions for simplifying the cores for the 'Goshawk II' crankcase, referencing drawings Lec.1413 and 1414. | 24th Jun 1921 | West Wittering \ G \ June1921 Scan76 | |
| Directive to halt detailing work on the Goshawk II battery ignition and governor mechanism. | 23th Jun 1921 | West Wittering \ G \ June1921 Scan78 | |
| The re-standardisation of a 40/50 HP condenser, specifically concerning a new earth connection and stud fixing. | 28th Jun 1921 | West Wittering \ G \ June1921 Scan79 | |
| In-house production of Bakelite moulds, coil cases, and other electrical components. | 27th Jun 1921 | West Wittering \ G \ June1921 Scan81 | |
| Design flaws of the side filler on the petrol tank for the 4.EX car. | 26th Jun 1921 | West Wittering \ G \ June1921 Scan83 | |
| The design and issues of petrol tank level indicators, fillers, and vent pipes, comparing different schemes. | 28th Jun 1921 | West Wittering \ G \ June1921 Scan84 | |
| Comparison of fuel indicators for the 4.EX car and a critique of a petrol filter fitting design. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan85 | |
| Results of performance and discharge tests on batteries, specifically the R.R. Tudor 1. | 2nd Jun 1921 | West Wittering \ G \ June1921 Scan87 | |
| The performance and testing of various batteries, including models from Tudor, De Martin, and Exide. | 2nd Jun 1921 | West Wittering \ G \ June1921 Scan88 | |
| The performance and testing of C.A.V. Willard batteries, including vibration tests. | 2nd Jun 1921 | West Wittering \ G \ June1921 Scan89 | |
| Table of results from experimental tests on charging, lighting, and starting batteries. | 6th Aug 1919 | West Wittering \ G \ June1921 Scan90 | |
| Graph showing intermittent high rate discharge tests of various batteries. | 6th May 1921 | West Wittering \ G \ June1921 Scan93 | |
| Discharge test graph for an R.R. Tudor I component. | 19th May 1921 | West Wittering \ G \ June1921 Scan94 | |
| Recommending the modern 'Boyce' patent push-on tyre pump connection over the old-fashioned screw type. | 2nd Jun 1921 | West Wittering \ G \ June1921 Scan95 | |
| Presenting a table of results from heating tests conducted on inherently controlled chassis dynamos. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan96 | |
| Test results for inherently controlled chassis dynamos. | 3rd Jun 1921 | West Wittering \ G \ June1921 Scan97 | |
| Experimental running of tungsten contact points, including a suggestion from Mr. Royce. | 6th Jun 1921 | West Wittering \ G \ June1921 Scan98 | |
| Various bench tests conducted on tungsten contact points supplied by the Tungsten Manufacturing Co. | 25th May 1921 | West Wittering \ G \ June1921 Scan99 | |
| Report page detailing observations on metal surfaces after a 45-hour experiment involving tungsten points and electrical sparking. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan100 | |
| Test report on tungsten contact points from Fansteel Co. U.S.A. after a 400-hour bench run. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan101 | |
| The preliminary test run of a lengthened Lucas E.575 dynamo. | 11th Jun 1921 | West Wittering \ G \ June1921 Scan102 | |
| Adoption of straight-sided cord tyres for the 'Goshawk' model and their performance. | 22th Jun 1921 | West Wittering \ G \ June1921 Scan103 | |
| Performance test results of a lengthened Lucas E.575 dynamo. | 22th Jun 1921 | West Wittering \ G \ June1921 Scan104 | |
| Comparison of dynamo control methods, specifically regarding the performance of the control brush. | 22th Jun 1921 | West Wittering \ G \ June1921 Scan105 | |
| Continued typed report page comparing a machine's temperature performance against a Smith machine. | 22th Jun 1921 | West Wittering \ G \ June1921 Scan106 | |
| Graph comparing output curves for standard and lengthened Lucas E57S dynamos under hot and cold conditions. | 23th Jun 1921 | West Wittering \ G \ June1921 Scan107 | |
| Modifications to Exide and Tudor batteries to prevent corrosion on terminal lugs. | 23th Jun 1921 | West Wittering \ G \ June1921 Scan108 | |
| Analysis of battery terminal corrosion concerning brass and leaden washers, and suggestions for improved arrangements. | 23th Jun 1921 | West Wittering \ G \ June1921 Scan109 | |
| Comparison of battery specifications and performance from suppliers such as Tudor, C.A.V., and Exide. | 23th Jun 1921 | West Wittering \ G \ June1921 Scan110 | |
| Note comparing the prices of Tudor, Exide, and C.A.V. Willard batteries. | 23th Jun 1921 | West Wittering \ G \ June1921 Scan111 | |
| Results of disintegration tests conducted on battery plates. | 23th Jun 1921 | West Wittering \ G \ June1921 Scan112 | |
| Variability and failure issues in single field winding, third brush controlled dynamos. | 23th Jun 1921 | West Wittering \ G \ June1921 Scan113 | |
| The endurance testing of a new type Lucas cutout with a duplex magnetic circuit. | 24th Jun 1921 | West Wittering \ G \ June1921 Scan114 | |
| Analysis of a fault in a cutout component concerning operating voltage and reverse current. | 24th Jun 1921 | West Wittering \ G \ June1921 Scan115 | |
| The performance of an electrical cutout, noting issues with battery charging and magnetic reluctance. | 24th Jun 1921 | West Wittering \ G \ June1921 Scan116 | |
| Standardisation of smaller iridio-platinum contact points and increasing condenser capacity. | 11th Dec 1921 | West Wittering \ G \ October1921 Scan0 | |
| The quality, testing, and adjustment of Bleriot Phi Cutouts samples fitted to various chassis. | 6th Oct 1921 | West Wittering \ G \ October1921 Scan1 | |
| Testing of a Bleriot Phi cutout and its potential use on the Goshawk chassis. | 16th Oct 1921 | West Wittering \ G \ October1921 Scan2 | |
| Test report on a Smith 4D dynamo for the Goshawk II engine. | 17th Oct 1921 | West Wittering \ G \ October1921 Scan3 | |
| The specifications and performance testing of a dynamo, including cold condition and heating test results. | 17th Oct 1921 | West Wittering \ G \ October1921 Scan4 | |
| Page 3 of a report noting that maximum temperature did not coincide with the largest output obtained. | 7th Oct 1921 | West Wittering \ G \ October1921 Scan5 | |
| Weight correction and specifications for the X.4359L Lucas E.5RR Dynamo for the 'Goshawk II'. | 7th Oct 1921 | West Wittering \ G \ October1921 Scan7 | |
| Dynamo switch configurations, circulating current, and output variations on different machines. | 7th Oct 1921 | West Wittering \ G \ October1921 Scan8 | |
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