| Description | Date | Identifier | |
| Test data on the thermal efficiency and power of the 40/50 test engine at low compression, including a heat balance analysis. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan26 | |
| Table showing heat distribution as a percentage of heat supplied at various engine speeds (RPM). | 12th Jul 1923 | West Wittering \ K \ September1923 Scan27 | |
| Data sheet showing heat flow to cooling water under various throttle, load, and compression ratio conditions. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan28 | |
| Test data tables for heat flow with varying mixture strength and ignition timing on a low compression engine. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan29 | |
| Data tables comparing engine heat flow and horsepower with clean vs. carbonised engines, and with aluminium vs. cast iron pistons. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan30 | |
| Blank page. | 11th Sep 1923 | West Wittering \ K \ September1923 Scan31 | |
| The delivery of car 4-Goshawk-11, detailing its specifications including a modified camshaft and balloon tyres. | 11th Sep 1923 | West Wittering \ K \ September1923 Scan32 | |
| Bench test results for a post-war R. Bosch combined dynamo regulator and cut-out unit. | 11th Sep 1923 | West Wittering \ K \ September1923 Scan33 | |
| Dynamo regulation and trickle charge performance under various conditions. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan34 | |
| Test report on the proportion of battery charge, external load, and dynamo delivery at 1500 r.p.m. | 11th Sep 1923 | West Wittering \ K \ September1923 Scan35 | |
| Tests of a Westinghouse vibrator regulator used with various dynamos. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan36 | |
| Secret memo regarding the proactive preparation of bodies for the new E.A.C. engine. | 11th Sep 1923 | West Wittering \ K \ September1923 Scan37 | |
| Design points and necessary alterations for a sample E.A.C. brush holder. | 13th Sep 1923 | West Wittering \ K \ September1923 Scan38 | |
| The performance and limitations of a Goshawk battery ignition system. | 14th Sep 1923 | West Wittering \ K \ September1923 Scan39 | |
| Distributor head sparking, condenser capacity, and spark gap tests. | 14th Sep 1923 | West Wittering \ K \ September1923 Scan40 | |
| Investigation into sparking to earth within the Goshawk battery ignition distributor. | 5th Sep 1923 | West Wittering \ K \ September1923 Scan41 | |
| Table of results from a sparking test, comparing outcomes at different gap sizes under correct and incorrect current directions. | 5th Sep 1923 | West Wittering \ K \ September1923 Scan42 | |
| Differences in distributor sparking based on the direction of current flow. | 14th Sep 1923 | West Wittering \ K \ September1923 Scan43 | |
| Preventing water boiling in a vehicle's cooling system by running it under pressure. | 14th Sep 1923 | West Wittering \ K \ September1923 Scan44 | |
| Pump gland system with a proposal for modifying radiator overflow pipes. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan45 | |
| Method of increasing the boiling point of radiator water by subjecting it to pressure. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan46 | |
| Pressurized radiator system to increase the boiling point of the coolant. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan47 | |
| Page detailing boiling points at different pressures and engine temperature/pressure tests at various speeds. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan48 | |
| Road tests of a standard engine's cooling system during hill climbs. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan49 | |
| Sparking over in the battery ignition distributor head on a 20 HP chassis. | 18th Sep 1923 | West Wittering \ K \ September1923 Scan50 | |
| Investigating a 'roar' sound on a Goshawk 11 engine. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan51 | |
| The effects of different valve timings on engine firing and cylinder pressure. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan52 | |
| Engine roaring, investigating the relationship with valve timing, gas discharge and pressure. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan53 | |
| Adjusting valve timing and tappet clearance to control engine roar. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan54 | |
| Varying camshaft timing and its effect on cylinder pressure and inlet valve opening. | 17th Aug 1923 | West Wittering \ K \ September1923 Scan55 | |
| Graph of piston displacement against crank angles, with blank fields for recording engine test data. | 17th Aug 1923 | West Wittering \ K \ September1923 Scan56 | |
| Analysis of cylinder pressure using a light spring card with a non-firing cylinder at varied RPMs. | 17th Aug 1922 | West Wittering \ K \ September1923 Scan57 | |
| Performance graph plotting piston displacement against crank angles at various RPMs. | 17th Aug 1922 | West Wittering \ K \ September1923 Scan58 | |
| Analysis of a light spring indicator card to deduce back pressure with the exhaust manifold on and off. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan59 | |
| Graph showing piston displacement for crank angles, comparing performance with the exhaust manifold on and off at 2000 RPM. | 17th Aug 1923 | West Wittering \ K \ September1923 Scan60 | |
| The effects of setting exhaust tappet at various clearances on cylinder pressure. | 17th Aug 1928 | West Wittering \ K \ September1923 Scan61 | |
| Graph plotting piston displacement against crank angles for different clearances, with a data entry section for engine performance metrics. | 17th Aug 1928 | West Wittering \ K \ September1923 Scan62 | |
| Analysis of light spring diagrams for a non-firing engine with varied exhaust conditions. | 17th Sep 1923 | West Wittering \ K \ September1923 Scan63 | |
| Graph comparing exhaust manifold performance against piston displacement for crank angles. | 17th Sep 1923 | West Wittering \ K \ September1923 Scan64 | |
| Clarifying corrections to the Goshawk 11 Frame Deflection chart. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan65 | |
| The conditions existing in a G.11 cylinder under firing conditions. | 21th Sep 1923 | West Wittering \ K \ September1923 Scan66 | |
| Engine cylinder pressure, induction stroke, back pressure, and compression diagrams. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan67 | |
| Indicator, Induction, and Compression diagrams for a G.II engine. | 21th Sep 1923 | West Wittering \ K \ September1923 Scan68 | |
| Querying the process for receiving and dealing with designs for American alterations. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan69 | |
| Secret internal memo reporting on the first test run of the E.A.C. engine under light loads. | 21th Sep 1923 | West Wittering \ K \ September1923 Scan70 | |
| Torque reaction vibrations in an engine. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan71 | |
| Measuring engine torque and the effects of friction damping. | 22th Sep 1923 | West Wittering \ K \ September1923 Scan72 | |
| Blueprint of the G II 20 H/P engine unit, detailing fitted components and total weight. | 24th Sep 1923 | West Wittering \ K \ September1923 Scan73 | |
| The power output and torque curve for the E.A.C. engine fitted with a 40/50 HP carburetter. | 24th Sep 1923 | West Wittering \ K \ September1923 Scan74 | |
| Performance of Goshawk dynamos and the upcoming testing of an E.A.C. dynamo. | 26th Sep 1923 | West Wittering \ K \ September1923 Scan75 | |
| Secret memo discussing the urgent need to fit front-wheel brakes and suggesting acquiring a Hispano car for comparison. | 27th Sep 1923 | West Wittering \ K \ September1923 Scan76 | |
| Complaints of owners losing the petrol tank filler cap and proposing solutions. | 27th Sep 1923 | West Wittering \ K \ September1923 Scan77 | |
| Weakness in the third brush system of 20 HP dynamos causing overheating due to partial jamming of the main brush. | 27th Sep 1925 | West Wittering \ K \ September1923 Scan78 | |
| Analysis of dynamo overheating, suggesting issues with brush contact and bedding as a probable cause. | 27th Sep 1923 | West Wittering \ K \ September1923 Scan79 | |
| Test report on the behaviour of a 20 HP dynamo when excited but unloaded. | 28th Sep 1923 | West Wittering \ K \ September1923 Scan80 | |
| Test results and temperature analysis for a dynamo under various conditions. | 28th Sep 1923 | West Wittering \ K \ September1923 Scan81 | |
| The temperature at which a dynamo's carcase corresponds to the melting point of commutator solder. | 28th Sep 1923 | West Wittering \ K \ September1923 Scan82 | |
| Engine power curve results with an E.A.C. carburetter and a difficulty encountered during tappet adjustment. | 29th Sep 1923 | West Wittering \ K \ September1923 Scan83 | |
| Instructions for locking the front engine suspension on a 6.EX car using spherical washers. | 29th Sep 1923 | West Wittering \ K \ September1923 Scan84 | |
| Confirming experiments on engine suspension are nearly complete and a full report will follow. | 29th Sep 1923 | West Wittering \ K \ September1923 Scan85 | |
| Flexible mounting for the rear end of the engine on a 40/50 chassis. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan86 | |
| Error on the 20.HP chassis print regarding identical accelerator pedals for different chassis types. | 3rd Sep 1923 | West Wittering \ K \ September1923 Scan87 | |
| Issues with lubricators on the 20 HP rear universal joint being knocked off by coachbuilders and potential solutions. | 9th Mar 1923 | West Wittering \ K \ September1923 Scan88 | |
| Alternative lubrication points and fittings for a mechanical joint, including diagrams. | 4th Sep 1923 | West Wittering \ K \ September1923 Scan89 | |
| Inspection report detailing required parts and modifications for a 20.HP Beaton All Weather chassis, R. X3730. | 3rd Sep 1923 | West Wittering \ K \ September1923 Scan90 | |
| Letter detailing the dispatch of luggage carrier parts to coachbuilders and other involved parties. | 5th Sep 1923 | West Wittering \ K \ September1923 Scan91 | |
| Design suggestions for piston pins and requesting they be tested. | 5th Sep 1923 | West Wittering \ K \ September1923 Scan92 | |
| Modifications to a Goshawk 11 luggage grid based on experience. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan93 | |
| Applying a Bijur starting pinion to early Goshawk engines. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan94 | |
| Proposal for an extension on the Goshawk 11 engine's valve guide to shield the valve stem from heat. | 6th Sep 1923 | West Wittering \ K \ September1923 Scan95 | |
| Modifications to the Goshawk 11 dipping headlight arrangement and operating gear. | 8th Sep 1923 | West Wittering \ K \ September1923 Scan96 | |
| Cancelled memo regarding headlamps and a spring adjustment for a 20.HP All-Weather car. | 8th Sep 1923 | West Wittering \ K \ September1923 Scan97 | |
| Revised drawing for a 40/50 chassis oil level indicator. | 11th Sep 1923 | West Wittering \ K \ September1923 Scan98 | |
| Drawing Lec.1761 for an improved Bendix drive on the Goshawk 11 engine, comparing it to a Bijur drive. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan99 | |
| Improved Bendix drive for the Goshawk 11 engine and its comparison to a Bijur design. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan100 | |
| The Goshawk 11 power unit suspension with arms on the front of the crankcase. | 12th Sep 1923 | West Wittering \ K \ September1923 Scan101 | |
| Methods to reduce engine heat in the passenger cabin. | 12th Sep 1923 | West Wittering \ K \ September1923 Scan102 | |
| Report discussing engine cooling issues and potential modifications for different car models. | 14th Sep 1923 | West Wittering \ K \ September1923 Scan103 | |
| Urgent experiments on the suspension of the 40/50 and Goshawk engines to address torque reactions. | 14th Sep 1923 | West Wittering \ K \ September1923 Scan104 | |
| Requirement of two rear wing stays and fittings for car 5.Goshawk 11 at Bromley. | 14th Sep 1923 | West Wittering \ K \ September1923 Scan105 | |
| Requesting an investigation into the clearance of floating bushes in connecting rods as suggested by Mr. Royce. | 14th Sep 1923 | West Wittering \ K \ September1923 Scan106 | |
| Delegating a query about an instrument board light switch to another person. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan107 | |
| Modification to the Goshawk 11 universal joint lubricator. | 14th Sep 1923 | West Wittering \ K \ September1923 Scan108 | |
| Sending drawings for Goshawk I & Goshawk II engine torque reaction dampers. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan109 | |
| The formation of an Experimental Committee, its members, remit, and priority projects. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan110 | |
| Outlining torque reaction vibration experiments for the Goshawk engine. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan111 | |
| Frame deflection measurements on the Goshawk 11 and proposing modifications. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan112 | |
| Secret memo from 'R' to 'EFC' regarding progress on electrical work for dynamos and ignition systems. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan113 | |
| Expressing dissatisfaction with the Westinghouse electrical equipment for the U.S.A. Springfield chassis and considering alternatives from American Bosch and Delco. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan114 | |
| Secret memo from 'R' to 'EFC' regarding re-current improvements for starter motors, including double brushes and a teazer circuit. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan115 | |
| Car battery requirements, prioritizing reliability and quick charging over larger capacity. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan116 | |
| Three types of experimental chassis (EAC.1, EAC.11, and EAC.111) and their modifications. | 20th Sep 1923 | West Wittering \ K \ September1923 Scan117 | |
| Telegram confirmation from Royce enquiring about the effect of the centre of gyration on vibrations and damping arrangements. | 21th Sep 1923 | West Wittering \ K \ September1923 Scan118 | |
| Insulation and separation between the dash and scuttle on the 20.HP chassis. | 21th Sep 1923 | West Wittering \ K \ September1923 Scan119 | |
| Confirmation of a telegram from Royce in West Wittering to Derby. | 24th Sep 1923 | West Wittering \ K \ September1923 Scan120 | |
| The permanent scheme for a torque reaction damper on the Goshawk 11 engine. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan121 | |
| From 'E' to 'HS' requesting distance tubes for an experiment on making the 40/50 model's front feet rigid. | 27th Sep 1923 | West Wittering \ K \ September1923 Scan122 | |
| Schemes for mounting the power unit to dampen torque reactions. | 27th Sep 1923 | West Wittering \ K \ September1923 Scan123 | |
| The dispatch of distance pieces for a rigid front feet experiment on the 6.EX car. | 29th Sep 1923 | West Wittering \ K \ September1923 Scan124 | |
| Advantages of an engine oil level gauge over an oil cock, as used on the 20.HP chassis. | 29th Sep 1923 | West Wittering \ K \ September1923 Scan125 | |
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