| Description | Date | Identifier | |
| Continued use of subframes and the production plan for car bodies 18-EX and 19-EX. | 14th Sep 1928 | Box 65a \ 2 scan0053 | |
| Cover note forwarding a copy of a memo received from 'CWB'. | 15th Sep 1928 | Box 65a \ 2 scan0054 | |
| From CWB detailing a car's performance, particularly its cooling system, during a trip to Budapest. | 10th Sep 1928 | Box 65a \ 2 scan0055 | |
| Tyre performance, suspension, and steering issues during vehicle testing. | 18th Sep 1928 | Box 65a \ 2 scan0056 | |
| Confidential memo expressing concern about secrecy for 'SS' parts and the risk of knowledgeable visitors. | 18th Sep 1928 | Box 65a \ 2 scan0057 | |
| Confidential memo about the extreme secrecy concerning parts referred to as 'SS' and their secure storage. | 19th Sep 1928 | Box 65a \ 2 scan0058 | |
| Engine unit being ready for chassis installation, with further improvements planned for subsequent units. | 19th Sep 1928 | Box 65a \ 2 scan0059 | |
| Confidential memo discussing the production strategy for a left-hand drive 'SS' chassis for the American market. | 25th Sep 1928 | Box 65a \ 2 scan0060 | |
| State of design work report on the 'Canacha' chassis, detailing exceptions required for road testing and a list of further improvements. | 28th Sep 1928 | Box 65a \ 2 scan0061 | |
| Test report on Engine No. SS-3 detailing running conditions and tabulated compression pressures. | 28th Sep 1928 | Box 65a \ 2 scan0062 | |
| Various engine noise issues and planned investigations. | 25th Sep 1928 | Box 65a \ 2 scan0063 | |
| Graph of compression pressures against engine RPM for a Super Sports Engine. | 25th Sep 1928 | Box 65a \ 2 scan0064 | |
| Graph of Mechanical Efficiency and Friction Horsepower versus RPM for Engine No SS-3. | 25th Sep 1928 | Box 65a \ 2 scan0065 | |
| Query about returning a dummy chassis sent to coachbuilder Barkers, which was used for a Sports body on chassis 16-EX. | 2nd Oct 1928 | Box 65a \ 2 scan0066 | |
| Request to arrange for a dummy chassis at Barkers to be returned to Derby. | 3rd Oct 1928 | Box 65a \ 2 scan0067 | |
| Car work progress being temporarily overshadowed by aero work, with an update on a forthcoming S.S. chassis. | 18th Oct 1928 | Box 65a \ 2 scan0068 | |
| From 'R' expressing frustration at the slow progress of car improvements and outlining a new programme. | 20th Oct 1928 | Box 65a \ 2 scan0069 | |
| Inquiring about the availability of Experimental Car No. 17-EX for sale and shipment to India. | 24th Oct 1928 | Box 65a \ 2 scan0070 | |
| Declining to supply prints of WW designs for the SS chassis to America, based on instructions received. | 24th Oct 1928 | Box 65a \ 2 scan0071 | |
| Defending the pace of car development by listing numerous ongoing experimental projects. | 24th Oct 1928 | Box 65a \ 2 scan0072 | |
| Confirming the handover of car 17-EX to the Test Department for routine tests and inspection. | 25th Oct 1928 | Box 65a \ 2 scan0073 | |
| Listing outstanding designs required for the S.S. Chassis. | 25th Oct 1928 | Box 65a \ 2 scan0074 | |
| List of required designs to complete the S.S. chassis. | 25th Oct 1928 | Box 65a \ 2 scan0075 | |
| Confirming arrangements for car 14-EX to be brought to WW. | 10th Nov 1928 | Box 65a \ 2 scan0076 | |
| The sale and status of the Phantom Sports Car models. | 25th Oct 1928 | Box 65a \ 2 scan0077 | |
| The 'SS' engine development, comparing its performance against the standard F.2.B series engine. | 26th Oct 1928 | Box 65a \ 2 scan0078 | |
| Technical report discussing engine performance improvements related to carburetters and compression ratios. | 26th Oct 1928 | Box 65a \ 2 scan0079 | |
| Analysis of engine performance tests, detailing power gain distribution and airflow measurements through valves. | 26th Oct 1928 | Box 65a \ 2 scan0080 | |
| Analysis of increasing valve lift to improve air flow and volumetric efficiency in the SS engine, with plans for further testing. | 26th Oct 1928 | Box 65a \ 2 scan0081 | |
| Engine testing and development, focusing on induction systems, carburettors, manifolds, and pistons. | 26th Oct 1928 | Box 65a \ 2 scan0082 | |
| Engine spring and valve noise, with recommended solutions involving felt strips and spring washers. | 25th Sep 1928 | Box 65a \ 2 scan0083 | |
| Graph of Mechanical Efficiency and Friction Horse Power against R.P.M. for a Super Sports Engine. | 25th Sep 1928 | Box 65a \ 2 scan0084 | |
| Graph comparing air flow through Super Sports and F-2-B Series inlet valves against valve lift. | 26th Oct 1928 | Box 65a \ 2 scan0085 | |
| Graph comparing the power output of Super Sports engines against standard F-2-B series engines. | 26th Oct 1928 | Box 65a \ 2 scan0086 | |
| Blueprint of a rig for measuring air flow past valves on an S.S. cylinder head. | 27th Oct 1928 | Box 65a \ 2 scan0087 | |
| Complaint about a delay and providing an update on the progress of an SS. Chassis. | 27th Oct 1928 | Box 65a \ 2 scan0088 | |
| Status of various components for the 'SS' Chassis. | 27th Oct 1928 | Box 65a \ 2 scan0089 | |
| Letter from coachbuilders Thrupp & Maberly Ltd. arranging a demonstration car viewing. | 29th Oct 1928 | Box 65a \ 2 scan0090 | |
| Letter to Messrs. Thrupp & Maberly Ltd. arranging for a car to be seen at the Works rather than at a home address. | 30th Oct 1928 | Box 65a \ 2 scan0091 | |
| Road test report on a returned car, listing issues with the engine, clutch, brakes, steering, suspension, and a recurring petrol starvation problem. | 6th Nov 1928 | Box 65a \ 2 scan0092 | |
| Page 2 of a memo discussing a fuel starvation issue and requesting a report on its cause. | 7th Nov 1928 | Box 65a \ 2 scan0093 | |
| Introduction and features of the new 'SS' and G.4. chassis models. | 7th Nov 1928 | Box 65a \ 2 scan0094 | |
| Chassis improvements, production timelines, and the risks of being outdated. | 9th Nov 1928 | Box 65a \ 2 scan0095 | |
| Recommendations on connecting rods and crankshaft lubrication for the 'SS' engine. | 9th Nov 1928 | Box 65a \ 2 scan0096 | |
| Crankshaft oiling schemes for the Phantom and 'SS' models. | 7th Nov 1928 | Box 65a \ 2 scan0097 | |
| Urgent production of bodies for experimental 'SS' chassis to meet deadlines. | 7th Nov 1928 | Box 65a \ 2 scan0098 | |
| Secret internal memorandum deferring a board conclusion on the introduction of SS and G.4 models. | 28th Nov 1928 | Box 65a \ 2 scan0099 | |
| Telephone message regarding the 'SS' chassis, focusing on the changeover process and tappet design. | 12th Nov 1928 | Box 65a \ 2 scan0100 | |
| Improving cam and follower hardness, lubrication, and camshaft duration. | 8th Nov 1928 | Box 65a \ 2 scan0101 | |
| Response to a test report on the 12-EX car, addressing various mechanical issues. | 8th Nov 1928 | Box 65a \ 2 scan0102 | |
| Confidential memorandum discussing the introduction of new SS and G.4 chassis in light of the continued success of the Phantom model. | 12th Nov 1928 | Box 65a \ 2 scan0103 | |
| Secret memo from RJ to Sg. outlining key questions to inform the launch strategy for a new sporting model codenamed 'SS'. | 12th Nov 1928 | Box 65a \ 2 scan0104 | |
| Chassis alterations, testing protocols, and the risks of introducing a new chassis design. | 12th Nov 1926 | Box 65a \ 2 scan0105 | |
| Secret memo from B.J. to Sg. requesting information and arranging a conference in Derby. | 2nd Nov 1928 | Box 65a \ 2 scan0106 | |
| Final test routine and tyre fitting for the Experimental Sports Car 17-EX. | 13th Nov 1928 | Box 65a \ 2 scan0107 | |
| Post-test issues with the Experimental Sports Car 17-EX, including its special brakes and a broken screen wiper drive. | 15th Nov 1928 | Box 65a \ 2 scan0108 | |
| Secret internal memorandum comparing the specifications of the new 'SS' model to a previous experimental car, 14-EX. | 19th Nov 1928 | Box 65a \ 2 scan0109 | |
| Question and answer document regarding vehicle testing, alterations, and development timelines. | 7th Apr 1925 | Box 65a \ 2 scan0110 | |
| The development of the Phantom (EAC) engine and associated chassis between 1923 and 1924. | 15th Jan 1925 | Box 65a \ 2 scan0111 | |
| Typed historical summary of the development and testing of the Phantom and 'V' series chassis, including design changes and production instructions. | 15th Jan 1925 | Box 65a \ 2 scan0112 | |
| The Phantom car standardisation, the Condor engine's history, and the new SS chassis. | 15th Jan 1925 | Box 65a \ 2 scan0113 | |
| The experience of testing parts, specifically the lack of road experience for the 'SS' car. | 20th Nov 1928 | Box 65a \ 2 scan0114 | |
| Requesting to collect a luggage box for an SS vehicle to improve its appearance. | 20th Nov 1928 | Box 65a \ 2 scan0115 | |
| Completion of the first 'SS' chassis, its appearance, and the status of other components. | 20th Nov 1928 | Box 65a \ 2 scan0116 | |
| Production strategy for the 'SS' model, including the cessation of production for the RRAI 200 chassis. | 22th Nov 1928 | Box 65a \ 2 scan0117 | |
| Road test report on an 'SS' chassis, comparing its performance to the existing Phantom model. | 23th Nov 1928 | Box 65a \ 2 scan0118 | |
| Weight comparison table for the Standard 40/50 'V' Series and the 'SS' chassis. | 23th Nov 1928 | Box 65a \ 2 scan0119 | |
| Confidential memorandum from BJ to R regarding a conference on the introduction of the 'SS' and new 20 HP models. | 23th Nov 1928 | Box 65a \ 2 scan0120 | |
| Secrecy surrounding the 'SS' super-sports model chassis. | 26th Nov 1928 | Box 65a \ 2 scan0121 | |
| Secret memo from BJ to Hs requesting a summary of the 'SS' model's testing, development costs, and announcement timeline. | 26th Nov 1928 | Box 65a \ 2 scan0122 | |
| Delay in fitting a Barker body to chassis 18-EX due to incorrect dimensions. | 26th Nov 1928 | Box 65a \ 2 scan0123 | |
| Secret report detailing the impressive ride comfort of the 'SS' model on a 450-mile test run. | 28th Dec 1928 | Box 65a \ 2 scan0124 | |
| Performance comparison report of a new car model against the standard Phantom, noting various improvements and issues. | 12th Dec 1928 | Box 65a \ 2 scan0125 | |
| Testing status of certain car parts and the history of the V. series chassis. | 12th Dec 1928 | Box 65a \ 2 scan0126 | |
| List of incomplete parts for Chassis No 19EX. | 6th Dec 1928 | Box 65a \ 2 scan0127 | |
| From Hs. to BP. regarding arrangements for Mr. Yarnall to get particulars for the 18-EX car being sent to France. | 1st Dec 1928 | Box 65a \ 2 scan0128 | |
| Requesting recommendations for shipping a car to France, avoiding popular routes. | 6th Dec 1928 | Box 65a \ 2 scan0129 | |
| Telegram requesting photographs be taken of prototype car '18 EX' before it leaves for France. | 31th Dec 1938 | Box 65a \ 2 scan0130 | |
| Testing strategy for 'SS' and G.4. chassis ahead of next year's show. | 8th Dec 1928 | Box 65a \ 2 scan0131 | |
| Continued memo discussing vehicle options, driver availability, running schedules and performance expectations for quietness. | 10th Dec 1928 | Box 65a \ 2 scan0132 | |
| Informing of a change in plan to send car 14-EX to France instead of 18-EX. | 10th Dec 1928 | Box 65a \ 2 scan0133 | |
| Secret memorandum outlining measures to maintain the utmost secrecy regarding the 'SS' chassis project. | 10th Dec 1928 | Box 65a \ 2 scan0134 | |
| Clarifying that remarks on 'SGN' also apply to the new 20 HP model. | 10th Dec 1928 | Box 65a \ 2 scan0135 | |
| Arrangements for demonstrating the new 20HP car (14-G-4) and an 18-EX car, including a trip to France for modifications. | 11th Dec 1928 | Box 65a \ 2 scan0136 | |
| The dispatch of a 'Super-Sports' car for inspection by Mr. Royce. | 12th Dec 1928 | Box 65a \ 2 scan0137 | |
| Cancelling the touring acquit for car 12-EX, to be replaced by car 19-EX for a trip to France. | 17th Dec 1928 | Box 65a \ 2 scan0138 | |
| Secret memo discussing the trial results and potential drawbacks of the 18-RX model, particularly its length. | 17th Dec 1928 | Box 65a \ 2 scan0139 | |
| Secret internal memorandum detailing a road test of a new car model, covering its performance and handling. | 15th Dec 1928 | Box 65a \ 2 scan0140 | |
| Test report on a car's performance, discussing engine characteristics, vibrations, and other features. | 15th Dec 1928 | Box 65a \ 2 scan0141 | |
| Steering feel, body mounting on a sub-frame, and the hypoid axle gear. | 17th Dec 1928 | Box 65a \ 2 scan0142 | |
| Secret memo from BJ to R regarding a trial of the 18-EX, noting issues with jellying, steering, wheel size, and the car's excessive length. | 17th Dec 1928 | Box 65a \ 2 scan0143 | |
| Secret test report on a complete car, detailing its performance, handling, and appearance. | 15th Dec 1928 | Box 65a \ 2 scan0144 | |
| Vehicle performance, discussing steering vibration, engine characteristics, and other features. | 15th Dec 1928 | Box 65a \ 2 scan0145 | |
| Report discussing vehicle steering characteristics, subframe body mounting, and hypoid axle gearing. | 17th Dec 1928 | Box 65a \ 2 scan0146 | |
| Handling, wheel size, and length issues with the 18-EX experimental car following a trial. | 17th Dec 1928 | Box 65a \ 2 scan0147 | |
| The initial impressions of a new car's road test performance between Derby and West Wittering. | 15th Dec 1928 | Box 65a \ 2 scan0148 | |
| Vehicle performance, discussing steering column vibration, engine characteristics, and other features requiring attention. | 15th Dec 1928 | Box 65a \ 2 scan0149 | |
| Continued memorandum discussing steering ratios, subframe body mounting, and new hypoid axle gears. | 17th Dec 1928 | Box 65a \ 2 scan0150 | |
| Secret memo regarding a trial report for the 18-EX model, detailing issues and requesting updates on alterations. | 17th Dec 1928 | Box 65a \ 2 scan0151 | |
| Secret road test report on a complete car, detailing its performance, handling, and characteristics between Derby and West Wittering. | 15th Dec 1928 | Box 65a \ 2 scan0152 | |
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