| Description | Date | Identifier | |
| Weight specifications for the Goshawk model, including body weight, passenger load, and the required adjustment of springs. | 18th Sep 1922 | Box 107 \ 4 scan0007 | |
| Urgent internal memo requesting specific weight details for the Goshawk chassis. | 21th Sep 1922 | Box 107 \ 4 scan0008 | |
| Weight of the Goshawk chassis and its various components. | 1st Sep 1922 | Box 107 \ 4 scan0009 | |
| Maximum car weights and spring specifications for the Goshawk model. | 5th Oct 1922 | Box 107 \ 4 scan0010 | |
| Vital importance of weight saving in chassis and body design. | 5th Oct 1922 | Box 107 \ 4 scan0011 | |
| Weight distribution list for chassis spare parts, detailing front, rear, and total weights in pounds (LBS). | 14th Jun 1922 | Box 107 \ 4 scan0012 | |
| Specification sheet detailing the weight distribution for various car bodies and passenger configurations. | 14th Jun 1922 | Box 107 \ 4 scan0013 | |
| Breakdown of maximum and minimum car weights, detailing front, rear, and total pounds for various components. | 14th Jun 1922 | Box 107 \ 4 scan0014 | |
| Calculation sheet for car spring loads, detailing maximum, minimum, and proposed ranges. | 16th Nov 1922 | Box 107 \ 4 scan0015 | |
| Weight limitations for the Goshawk model and the terms of the associated guarantee. | 16th Nov 1922 | Box 107 \ 4 scan0016 | |
| Continuation page concerning front axle weight limits and referencing an attached document on Goshawk weights. | 1st Oct 1922 | Box 107 \ 4 scan0017 | |
| Correcting previously supplied Goshawk chassis weights and discussing guaranteed weight. | 20th Nov 1922 | Box 107 \ 4 scan0018 | |
| Comparison of the Goshawk and 40/50 models focusing on displacement per ton per mile. | 19th Jul 1917 | Box 107 \ 4 scan0019 | |
| From B.J. to Hs. requesting confirmation and clarification on Goshawk chassis and component weights. | 23th Nov 1922 | Box 107 \ 4 scan0020 | |
| Weight limit of the Goshawk car, proposing a reduction from a 39 cwt limit to 30 cwt. | 23th Nov 1922 | Box 107 \ 4 scan0021 | |
| Request for the weight of tools and spares supplied with the Goshawk chassis to revise statistics. | 23th Nov 1922 | Box 107 \ 4 scan0022 | |
| Breakdown of weights for the 7-Goshawk-11 car and discussion on rear axle and spring loads. | 24th Nov 1922 | Box 107 \ 4 scan0023 | |
| Weight calculations and passenger capacity for the Goshawk model. | 28th Nov 1922 | Box 107 \ 4 scan0024 | |
| Clarifying the complete weight of the Goshawk chassis, questioning whether to include the spare wheel and tyre. | 6th Dec 1922 | Box 107 \ 4 scan0025 | |
| Particulars for the Goshawk chassis, including weight, engine specifications, and consumption data. | 12th Dec 1922 | Box 107 \ 4 scan0026 | |
| Weights and radii of gyration for the 40/50 and Goshawk clutch and flywheel assemblies. | 27th Feb 1923 | Box 107 \ 4 scan0027 | |
| Production faults related to the 20 HP chassis weight and setting a minimum oil consumption standard. | 16th Mar 1923 | Box 107 \ 4 scan0028 | |
| Weight of the 20-HP chassis and establishing an average weight. | 28th Mar 1923 | Box 107 \ 4 scan0029 | |
| List of weights for Goshawk engine piston and connecting rod components. | 13th Apr 1923 | Box 107 \ 4 scan0030 | |
| The weight measurements for the 7-Goshawk-11 vehicle. | 30th Apr 1923 | Box 107 \ 4 scan0031 | |
| Fitting experimental parts to Goshawk models and discussing the overweight body of a Maythorn Saloon. | 15th May 1923 | Box 107 \ 4 scan0032 | |
| Specification sheet detailing the weights of the 20 HP Goshawk-11 chassis in various configurations. | 5th Jun 1923 | Box 107 \ 4 scan0033 | |
| Comparison report on the stability and top-heaviness of a Maythorn Saloon versus a standard Hooper Limousine on a 20 HP chassis. | 13th Jun 1923 | Box 107 \ 4 scan0034 | |
| The methodology of tests to determine the centre of gravity of various car types. | 31th May 1923 | Box 107 \ 4 scan0035 | |
| Experiments on vehicle suspension and weight distribution for Goshawk-11 models. | 31th May 1923 | Box 107 \ 4 scan0036 | |
| Table detailing the Centre of Gravity and total weight for various Goshawk car models. | 5th Jun 1923 | Box 107 \ 4 scan0037 | |
| Estimating the weight of the roofs for 7-Goshawk-11 and 3-Goshawk-11 car models. | 5th Jun 1923 | Box 107 \ 4 scan0038 | |
| Comparison of specifications for Saloon and Limousine Goshawk-11 model car roofs. | 12th Jun 1923 | Box 107 \ 4 scan0039 | |
| Breakdown of weight differences between the 3-Goshawk-11 and 7-Goshawk-11 models. | 12th Jun 1923 | Box 107 \ 4 scan0040 | |
| Calculation of theoretical rollover speeds for a touring car and a bodied car on a 100 ft. radius corner. | 7th Jun 1923 | Box 107 \ 4 scan0041 | |
| Weight of the 20 HP chassis and its increase over the originally agreed weight. | 7th Jun 1923 | Box 107 \ 4 scan0042 | |
| Weight of the 20-HP chassis and the basis for its guarantee. | 2nd Jun 1923 | Box 107 \ 4 scan0043 | |
| The weight of a luggage grid for the Goshawk. | 15th Jun 1923 | Box 107 \ 4 scan0044 | |
| Goshawk 11 wheels including weight, tyre specifications, pressure, and revolutions per mile. | 28th Jun 1923 | Box 107 \ 4 scan0045 | |
| Capacities and weights for the Goshawk 11 radiator components. | 4th Jul 1923 | Box 107 \ 4 scan0046 | |
| Information and test results for a vehicle's radiator and cooling system components. | 22th Sep 1923 | Box 107 \ 4 scan0047 | |
| Torque reaction vibrations, including a diagram of the engine test setup. | 22th Sep 1923 | Box 107 \ 4 scan0048 | |
| Measuring engine torque and the development of a spring-controlled arm for accurate readings. | 22th Sep 1923 | Box 107 \ 4 scan0049 | |
| Blueprint detailing the total weight and included components of the 8.G.I. engine unit. | 24th Sep 1923 | Box 107 \ 4 scan0050 | |
| Negative implications of increasing car body weight on the 20 HP model. | 1st Jan 1924 | Box 107 \ 4 scan0051 | |
| Effects of additional weight on the 20 HP Goshawk Chassis and proposing a 10,000-mile test. | 1st Jan 1924 | Box 107 \ 4 scan0052 | |
| Weight specification for the Goshawk unit. | 12th Feb 1924 | Box 107 \ 4 scan0053 | |
| Weights of the 20 HP Goshawk engine unit. | 18th Feb 1924 | Box 107 \ 4 scan0054 | |
| Table listing the weights of various engine components and their weight relative to displacement. | 18th Feb 1924 | Box 107 \ 4 scan0055 | |
| Continued weight schedule for engine components, with part numbers, weights in lbs, and weight per displacement. | 18th Feb 1924 | Box 107 \ 4 scan0056 | |
| Comparative table of weights for portions of different engine models per 100 cubic inches of displacement. | 18th Feb 1924 | Box 107 \ 4 scan0057 | |
| Stating the weight of a G.111 Gearbox with right hand levers. | 3rd Apr 1924 | Box 107 \ 4 scan0058 | |
| Comparison of specifications for the Standard and Thermostat type 20 HP radiator. | 3rd Apr 1924 | Box 107 \ 4 scan0059 | |
| Weight comparison between a 20 HP car with chassis GF.68 and an Experimental Limousine 3-G-11. | 7th Nov 1924 | Box 107 \ 4 scan0060 | |
| From the Test Department detailing the average weights of the 40/50 'U' series and 20 HP chassis. | 24th Feb 1925 | Box 107 \ 4 scan0061 | |
| Weight details for model 9 G III, including total road weight and axle weights. | 1st Jun 1925 | Box 107 \ 4 scan0062 | |
| The completion and delivery schedule of a Phantom chassis. | 2nd Jun 1925 | Box 107 \ 4 scan0063 | |
| Secret internal memo detailing the weights and specifications of the front axle and springs for car 9-G-111. | 2nd Jun 1925 | Box 107 \ 4 scan0064 | |
| Requesting the weight of the old India Front Axle forging for comparison with a new 32 lbs forging. | 1st Oct 1925 | Box 107 \ 4 scan0065 | |
| The weights of the 20 HP front axle with and without front wheel brakes. | 13th Nov 1925 | Box 107 \ 4 scan0066 | |
| Parts list detailing the component weights for the Goshawk II and Goshawk III front axles. | 18th Feb 1925 | Box 107 \ 4 scan0067 | |
| Performance and weight test results for a 20 HP, Chassis 1150, conducted on Ticknall Hill. | 18th Feb 1925 | Box 107 \ 4 scan0068 | |
| Table detailing the front, rear, and total weights of various car models and body types. | 26th Jan 1926 | Box 107 \ 4 scan0069 | |
| And calculating the weight differences between components of the G.111 and G.11 chassis. | 1st Feb 1926 | Box 107 \ 4 scan0070 | |
| Attached blueprints giving weights for Goshawk II and III components, including the gearbox, flywheel, clutch, and servo. | 24th Feb 1926 | Box 107 \ 4 scan0071 | |
| Post Office telegram urgently requesting weights for a specific reference. | 24th Oct 1926 | Box 107 \ 4 scan0072 | |
| Requesting approximate body weights for a 20 HP Sales Trials car for the calculation of springs. | 22th Mar 1926 | Box 107 \ 4 scan0073 | |
| Weight calculation sheet for a 20 HP, 10,000-mile trials car for sales. | 22th Mar 1926 | Box 107 \ 4 scan0074 | |
| Estimated specification of weights for a 10,000 miles trials car for 'Sales' (20 HP). | 23th Mar 1926 | Box 107 \ 4 scan0075 | |
| Body weight limitations, back axle ratios, and proposed engine modifications for the 20 HP model. | 12th Mar 1926 | Box 107 \ 4 scan0076 | |
| Continued note on modifications to a 20 HP chassis, specifically the louvres and front axle control. | 1st Feb 1927 | Box 107 \ 4 scan0077 | |
| Importance of weight reduction on the 40/50 & 20 HP models for performance and legal compliance. | 1st Feb 1927 | Box 107 \ 4 scan0078 | |
| Continued discussion on fabric-covered car bodies, their finish, weight, and cost considerations. | 17th Feb 1927 | Box 107 \ 4 scan0079 | |
| List of 20-HP chassis weights between 1922 and 1927, noting the increases and the reasons for them. | 17th Feb 1927 | Box 107 \ 4 scan0080 | |
| Request for a comparative weights table for axle parts of the EAC.7 and 40/50 HP models. | 25th Oct 1927 | Box 107 \ 4 scan0081 | |
| Weight reduction on a 20 HP chassis by modifying the flywheel, clutch, and engine head. | 28th Nov 1927 | Box 107 \ 4 scan0082 | |
| Calculations to find the radius of gyration squared for an 11-G-111 landaulet body by swinging. | 28th Nov 1927 | Box 107 \ 4 scan0083 | |
| Diagram and calculations for determining the center of gravity of a vehicle's sprung and unsprung mass. | 28th Nov 1927 | Box 107 \ 4 scan0084 | |
| Page of calculations involving variables k²F, ab, and their ratio, with results in square feet. | 5th Apr 1928 | Box 107 \ 4 scan0085 | |
| The weight difference between a standard and a lightened Goshawk flywheel. | 5th Apr 1928 | Box 107 \ 4 scan0086 | |
| List of approximate weights for the 20 HP chassis with medium pressure tyres and wellbase wheels. | 16th Jan 1928 | Box 107 \ 4 scan0087 | |
| Calculation of the radius of gyration (K²) for car model 11-G-111 (landaulet body) by swinging. | 16th Jan 1928 | Box 107 \ 4 scan0088 | |
| Page of calculations and a diagram concerning vehicle center of gravity and mass distribution. | 16th Jan 1928 | Box 107 \ 4 scan0089 | |
| Page of engineering calculations, continued from a previous page. | 22th Aug 1928 | Box 107 \ 4 scan0090 | |
| Surprising weight of a Barker Coupe Limousine and proposing a weight analysis of a modified chassis. | 22th Aug 1928 | Box 107 \ 4 scan0091 | |
| Comparing car performance based on weight and engine capacity for the 'SS', 20 HP, Phantom, and Chrysler models. | 13th Apr 1929 | Box 107 \ 4 scan0092 | |
| Data table comparing specifications of various car models including Phantom, S.S., 20 HP, and Chrysler. | 15th Apr 1929 | Box 107 \ 4 scan0093 | |
| Proposed performance improvements for the 20 HP car engine. | 15th Apr 1929 | Box 107 \ 4 scan0094 | |
| Performance calculation sheet comparing engine capacity, weight, and axle ratio for a 20 HP model. | 16th Aug 1929 | Box 107 \ 4 scan0095 | |
| List of average finished car weights for 'Standard Bodies' and 'De Luxe Bodies' with handwritten annotations. | 16th Aug 1929 | Box 107 \ 4 scan0096 | |
| The weight of a 'China' engine and gearbox unit for a 20 HP lote. | 10th Jan 1930 | Box 107 \ 4 scan0097 | |
| Analysing the 25 HP chassis weight in comparison to a Chrysler car, concluding not to add further weight. | 14th Jan 1931 | Box 107 \ 4 scan0098 | |
| Car weights, comparing customer cars to the 26-EX experimental model and the impact of accessories. | 2nd Feb 1931 | Box 107 \ 4 scan0099 | |
| Discrepancies in the weights of various car bodies and complete cars. | 2nd Jun 1931 | Box 107 \ 4 scan0100 | |
| Comparing the weights of various 6-seater Pullman limousine bodies and discussing weight reduction challenges. | 17th Feb 1931 | Box 107 \ 4 scan0101 | |
| Unreliability of experimental car weight data and the impact of coachbuilder fittings and materials on total vehicle weight. | 17th Feb 1931 | Box 107 \ 4 scan0102 | |
| Messrs Barker's accessories and the need to gather comparative weight data for various cars. | 17th Feb 1931 | Box 107 \ 4 scan0103 | |
| Table of front and rear chassis weights for the Phantom II and 20/25 models. | 17th Feb 1931 | Box 107 \ 4 scan0104 | |
| Table detailing car weights over front and rear axles, and shock damper loadings for various models. | 1st Mar 1931 | Box 107 \ 4 scan0105 | |
| Confidential internal memorandum concerning car body weights and coachbuilder practices. | 1st Mar 1931 | Box 107 \ 4 scan0106 | |
| | | | |