| Description | Date | Identifier | |
| Plans to lighten a Phantom engine without a major redesign, comparing its weight to the Silver Ghost. | 1st Dec 1925 | Box 71 \ 2 scan0109 | |
| List of 14 proposed alterations to reduce the weight of the Phantom engine. | 9th Dec 1925 | Box 71 \ 2 scan0110 | |
| Weight reduction opportunities and material choices for engine components, specifically referencing the Phantom engine. | 23th Nov 1925 | Box 71 \ 2 scan0111 | |
| Weight saving on modified New Phantom rear brake drums. | 15th Jan 1926 | Box 71 \ 2 scan0112 | |
| Replacement and comparison of rear springs for 7-EX, 20 HP, and 40/50 HP cars. | 22th Jan 1926 | Box 71 \ 2 scan0113 | |
| Springing complaints for the 40/50 HP and 20 HP models, comparing suspension performance and customer feedback. | 22th Jan 1926 | Box 71 \ 2 scan0114 | |
| Frame deflection and springing problems causing passenger discomfort, with proposals for testing. | 22th Jan 1926 | Box 71 \ 2 scan0115 | |
| Continued memo critiquing the car's springing system in comparison to the Lancia Lambda. | 22th Jan 1926 | Box 71 \ 2 scan0116 | |
| Comparison of springing, load, and weight calculations for the 20 HP and 40/50 HP models. | 22th Jan 1926 | Box 71 \ 2 scan0117 | |
| Specifications for spare wheel weights and associated spring adjustments for 20 HP and 40/50 HP models. | 22th Jan 1926 | Box 71 \ 2 scan0118 | |
| Calculation sheet for the spring loads of a 7-EX Phantom car scheduled for running in France. | 22th Jan 1926 | Box 71 \ 2 scan0119 | |
| Comparison of rear spring deflection under full load for 20 HP and 40/50 HP cars. | 22th Jan 1926 | Box 71 \ 2 scan0120 | |
| Specification sheet detailing spring loads and calculations for the New Phantom and 20 HP models. | 23th Jan 1926 | Box 71 \ 2 scan0121 | |
| Table of weights for various car models, broken down by front, rear, and total weight. | 26th Jan 1926 | Box 71 \ 2 scan0122 | |
| Outlining the value of using an aluminium head and cylinders for the Phantom Engine. | 8th Feb 1926 | Box 71 \ 2 scan0123 | |
| Listing the weights of the new Phantom rear axle components. | 11th Feb 1926 | Box 71 \ 2 scan0124 | |
| Requesting the unladen weights and details of any spring alterations for the London Trials cars. | 8th Feb 1926 | Box 71 \ 2 scan0125 | |
| Request for the weights of the 40/50 HP and 20 HP trials cars when fully equipped. | 20th Feb 1926 | Box 71 \ 2 scan0126 | |
| Test on a Phantom engine with old short rods to save weight and reduce crankcase height. | 23th Feb 1926 | Box 71 \ 2 scan0127 | |
| Providing the weights of three trial cars, with a handwritten note regarding their springs. | 24th Feb 1926 | Box 71 \ 2 scan0128 | |
| Responding to a request for the weights of trials cars, providing some preliminary figures. | 22th Feb 1926 | Box 71 \ 2 scan0129 | |
| Spring poundage for G.R. Minchin's car and London Trials Cars. | 20th Feb 1926 | Box 71 \ 2 scan0130 | |
| Putting a hold on the Lightened Phantom Engine for modifications and asking for suggestions on a short rod proposal. | 26th Feb 1926 | Box 71 \ 2 scan0131 | |
| Proposed modifications to the Phantom engine, specifically regarding pipe fittings and sparking plug placement. | 2nd Feb 1926 | Box 71 \ 2 scan0132 | |
| Testing a Phantom engine with shorter rods to reduce weight and crankcase height. | 23th Feb 1926 | Box 71 \ 2 scan0133 | |
| Investigation into the suspension balance differences between the Silver Ghost, 20 HP, and New Phantom chassis. | 19th Mar 1926 | Box 71 \ 2 scan0134 | |
| Schemes and suggestions for weight reduction on the Lighter Phantom engine and chassis. | 31th Mar 1926 | Box 71 \ 2 scan0135 | |
| Design considerations for a lighter Phantom engine, including blueprints, compression ratios and spark plug positioning. | 1st Apr 1926 | Box 71 \ 2 scan0136 | |
| List of nine suggestions for lightening the Phantom engine. | 4th Jan 1926 | Box 71 \ 2 scan0137 | |
| Outlining priorities for the Phantom weight reduction project. | 2nd Apr 1926 | Box 71 \ 2 scan0138 | |
| Comparison of the weights between a Cast Dashboard and a Standard Dashboard. | 8th Apr 1926 | Box 71 \ 2 scan0139 | |
| Potential development and benefits of a lighter aluminium Phantom engine with increased horsepower. | 11th Apr 1926 | Box 71 \ 2 scan0140 | |
| Feasibility of shortening the connecting rods for the Lighter Phantom engine. | 15th Apr 1926 | Box 71 \ 2 scan0141 | |
| Internal memorandum discussing modifications to the Lighter Phantom Engine, including longer rods, valve tappets, and a lighter clutch and flywheel. | 16th Apr 1926 | Box 71 \ 2 scan0142 | |
| Summary of chassis suspension design, covering the roles and interaction of tyres, road springs, and hydraulic dampers. | 25th Apr 1926 | Box 71 \ 2 scan0143 | |
| Suspension design, specifically spring length, stiffness, and damping for new car models. | 25th Apr 1926 | Box 71 \ 2 scan0144 | |
| Technical report discussing improvements to front axle control, spring stiffness, and weight distribution for enhanced ride comfort. | 25th Apr 1926 | Box 71 \ 2 scan0145 | |
| Report page discussing road spring control, horizontal rigidity, and the importance of suspension. | 26th Apr 1926 | Box 71 \ 2 scan0146 | |
| Further lightening of the Phantom flywheel and clutch by comparing its weight and inertia to the Silver Ghost's. | 26th Apr 1926 | Box 71 \ 2 scan0147 | |
| Experiments on Phantom suspension, dampers, and weight distribution. | 27th Apr 1926 | Box 71 \ 2 scan0148 | |
| The inspection process for castings and forgings to control for excess weight. | 4th May 1926 | Box 71 \ 2 scan0149 | |
| Development of a lighter Phantom engine with a new anti-detonating aluminium cylinder block and head. | 5th Apr 1926 | Box 71 \ 2 scan0150 | |
| Enclosed report on subframe body weights for 40/50 and 20 HP models, requesting standardized weighing procedures. | 12th May 1926 | Box 71 \ 2 scan0151 | |
| Cover memo for a telegram regarding the lightened New Phantom and Condor Camshaft gland modification. | 19th May 1926 | Box 71 \ 2 scan0152 | |
| Copy of a wire with instructions for adapting an aluminium block and head. | 19th May 1926 | Box 71 \ 2 scan0153 | |
| Delays and proposed design modifications for the lightened Phantom engine. | 9th Jun 1926 | Box 71 \ 2 scan0154 | |
| Report comparing the inertia and weight of Phantom and Silver Ghost flywheel and clutch units. | 10th Jun 1926 | Box 71 \ 2 scan0155 | |
| Design proposals for a lighter Phantom engine valve rocker cover. | 1st Jul 1926 | Box 71 \ 2 scan0156 | |
| Weight comparison between a standard C.I. induction system and a new Aluminium induction system. | 30th Aug 1926 | Box 71 \ 2 scan0157 | |
| The production of a lighter Phantom engine with aluminium cylinders and an improved induction pipe. | 31th Aug 1926 | Box 71 \ 2 scan0158 | |
| Comparison of weights for different Phantom front axles. | 22th Sep 1926 | Box 71 \ 2 scan0159 | |
| Comparative weights list for different Phantom Flywheel & Clutch assemblies. | 22th Sep 1926 | Box 71 \ 2 scan0160 | |
| Experiments to determine the torsional deflection and rigidity of a Phantom crankshaft. | 25th Sep 1926 | Box 71 \ 2 scan0161 | |
| Report page detailing the weight and polar moment of inertia for engine components, and calculations for the nodal point. | 25th Sep 1926 | Box 71 \ 2 scan0162 | |
| Analysis of crankshaft critical speed and vibration for the Phantom engine, comparing it to the 20 HP model. | 25th Sep 1926 | Box 71 \ 2 scan0163 | |
| Graph showing the torsional deflection of a Standard Phantom crankshaft supported in the crankcase bearings. | 27th Sep 1926 | Box 71 \ 2 scan0164 | |
| Comparative weights of standard and lightened components for a Phantom engine. | 27th Sep 1926 | Box 71 \ 2 scan0165 | |
| Valve timing and induction for the Aluminium Phantom engine. | 19th Oct 1926 | Box 71 \ 2 scan0166 | |
| Use of a cast light magnesium alloy for the valve rocker cover on the lighter Phantom engine. | 13th Oct 1926 | Box 71 \ 2 scan0167 | |
| Tests on cylinder and liner temperatures for the Lighter Phantom engine. | 18th Oct 1926 | Box 71 \ 2 scan0168 | |
| Placement and testing of couples within a cylinder bore, including diagrams. | 18th Oct 1926 | Box 71 \ 2 scan0169 | |
| Analysis of engine cylinder and liner temperatures under various speeds and compression ratios, including pre-ignition tests. | 18th Oct 1926 | Box 71 \ 2 scan0170 | |
| Engine tests investigating pre-ignition, temperature changes, and the effects of varying oil pressure. | 18th Oct 1926 | Box 71 \ 2 scan0171 | |
| Summary of test results on engine cylinder liners, discussing temperature, pre-ignition, and oil flow. | 18th Oct 1926 | Box 71 \ 2 scan0172 | |
| Graphs and a diagram showing liner temperatures for the Lighter Phantom Engine under various conditions. | 18th Oct 1926 | Box 71 \ 2 scan0173 | |
| Comparing the weight and capacity of a new radiator type with the current standard. | 31th Dec 1926 | Box 71 \ 2 scan0174 | |
| Vehicle weight reduction for the 40/50 and 20 HP models to improve performance and adhere to legal limits. | 18th Aug 1940 | Box 71 \ 2 scan0175 | |
| Continued discussion on fabric-covered car bodies, weighing their appearance against cost. | 10th Feb 1927 | Box 71 \ 2 scan0176 | |
| Preliminary lightening of the Phantom engine's waterpipe, flywheel, and clutch, and improvements to the induction system. | 10th Feb 1927 | Box 71 \ 2 scan0177 | |
| Internal memorandum discussing the supervision of coachbuilding, body design, and lightweight construction experiments. | 2nd Feb 1927 | Box 71 \ 2 scan0178 | |
| Vehicle weight reduction, chassis weight increases, and comparisons of coachwork and dippers. | 1st Feb 1927 | Box 71 \ 2 scan0179 | |
| List of weight changes for the 40/50HP chassis from 1923 to 1927, detailing the reasons for the modifications. | 7th Feb 1927 | Box 71 \ 2 scan0180 | |
| Improving riding qualities through optimal weight distribution. | 1st Jun 1927 | Box 71 \ 2 scan0181 | |
| On the latest design for Phantom wing stays and head-light fixings, noting weight savings and standardisation. | 9th Jul 1927 | Box 71 \ 2 scan0182 | |
| Outlining proposals for improving the riding qualities of 40/50 and 20 HP cars. | 9th Jul 1927 | Box 71 \ 2 scan0183 | |
| Design of a lightweight sports car body, referencing model 10-EX. | 13th Sep 1927 | Box 71 \ 2 scan0184 | |
| Progress report on the body and engine development for a sports car. | 20th Sep 1927 | Box 71 \ 2 scan0185 | |
| Technical memorandum detailing proposed chassis and engine improvements, including weight reduction and suspension modifications. | 20th Sep 1927 | Box 71 \ 2 scan0186 | |
| Continued typed memorandum discussing getting help from Mr. Wormald to shorten a delay. | 8th Oct 1927 | Box 71 \ 2 scan0187 | |
| Reminder request for a detailed breakdown of comparative weights for the EAC.7 and 40/50 back axles and related components. | 8th Oct 1927 | Box 71 \ 2 scan0188 | |
| Request to provide the comparative weights of various axle components for different models. | 25th Oct 1927 | Box 71 \ 2 scan0189 | |
| Axle weights, comparing an open propeller shaft with semi-elliptic springs to a cantilever construction. | 2nd Nov 1927 | Box 71 \ 2 scan0190 | |
| Comparison of axle weights between the EAC.7 and 40/50 HP models, detailing alterations due to the Hotchkiss drive. | 2nd Nov 1927 | Box 71 \ 2 scan0191 | |
| Table showing weight savings by comparing axle components between models EAC. 7 and 40/50. | 2nd Nov 1927 | Box 71 \ 2 scan0192 | |
| Comparison table of axle component weights for the EAC.7 and 40/50 models. | 4th Nov 1927 | Box 71 \ 2 scan0193 | |
| Axle weights and the inclusion of various components in the calculations. | 4th Nov 1927 | Box 71 \ 2 scan0194 | |
| Weight additions for the 40/50 axle control and recalculating weight savings for the EAC.7 transmission. | 3rd Nov 1927 | Box 71 \ 2 scan0195 | |
| Rear axle control weight reduction and the performance of thin leaf cantilever springs on the 40/50 model. | 11th Nov 1927 | Box 71 \ 2 scan0196 | |
| Spring stiffness and axle bump position adjustments. | 11th Nov 1927 | Box 71 \ 2 scan0197 | |
| The weight and performance of car road springs, comparing American designs with their own. | 14th Nov 1927 | Box 71 \ 2 scan0198 | |
| Continued discussion on leaf spring design, weight, material composition, and stiffness for the 40/50 model. | 14th Nov 1927 | Box 71 \ 2 scan0199 | |
| The weight increase of a stiffer spring compared to a standard spring, and the goal of weight reduction. | 21th Nov 1927 | Box 71 \ 2 scan0200 | |
| Weight comparison memo for new Sports versus Standard Phantom engine components. | 21th Nov 1927 | Box 71 \ 2 scan0201 | |
| Comparing the weights of a standard exhaust system and a new single downtake exhaust system, noting a weight saving. | 18th Nov 1927 | Box 71 \ 2 scan0202 | |
| Comparative weight analysis between an old and a new type 40/50 exhaust system. | 18th Nov 1927 | Box 71 \ 2 scan0203 | |
| Comparative weight analysis document for old and new type 40/50 exhaust systems. | 14th Dec 1927 | Box 71 \ 2 scan0204 | |
| Summary of brake distribution calculations for V. series, reduced front, and sports car configurations. | 14th Dec 1927 | Box 71 \ 2 scan0205 | |
| The anticipated weight of road springs for EAC.14 cars and possibility of reducing it through improved design. | 1st Jan 1928 | Box 71 \ 2 scan0206 | |
| Requesting to weigh various front axle parts for experimental information. | 4th Jan 1928 | Box 71 \ 2 scan0207 | |
| Breakdown of approximate weights for the 40/50 Phantom Chassis, its components, spares, and accessories. | 12th Jan 1928 | Box 71 \ 2 scan0208 | |
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