| Description | Date | Identifier | |
| The use and testing of an exhaust hot-spot for induction pipes as an alternative to hot water heating. | 1st Jun 1921 | Box 50 \ 3 Scan099 | |
| Table comparing engine performance data using different fuels and manifold conditions at full throttle. | 6th Jun 1921 | Box 50 \ 3 Scan100 | |
| Proposed visit to West Wittering to deliver Goshawk parts and discuss complaints from America. | 6th Jun 1921 | Box 50 \ 3 Scan101 | |
| Explosion behind the throttle on chassis 6.EX, experienced by Mr. Royce. | 6th Jun 1921 | Box 50 \ 3 Scan102 | |
| Notes regarding alterations to the induction system, specifically the application of heat to the carburettor. | 8th Jun 1921 | Box 50 \ 3 Scan103 | |
| The replacement of the piston throttle valve with a butterfly valve for the 20 HP model. | 10th Nov 1920 | Box 50 \ 3 Scan104 | |
| Engine complaints from the U.S.A., specifically concerning starting and running issues in cold winters with low-grade fuel. | 8th Jun 1921 | Box 50 \ 3 Scan105 | |
| Technical review of carburetter and induction system modifications for engine improvement. | 8th Jun 1921 | Box 50 \ 3 Scan106 | |
| Improving engine starting by using a small additional carburetter instead of a choke. | 8th Jun 1921 | Box 50 \ 3 Scan107 | |
| Required new design which has been applied to the new 20 HP chassis. | 8th Jun 1921 | Box 50 \ 3 Scan108 | |
| Clarifying the standard design of the starting and slow running device for the 40/50 chassis. | 9th Jun 1921 | Box 50 \ 3 Scan109 | |
| U.S.A. complaints and proposing tests on a new carburetter arrangement and throttle heating. | 9th Jun 1921 | Box 50 \ 3 Scan110 | |
| Sending an advance print of a 40/50 HP carburetter and induction pipe scheme for American conditions. | 11th Jun 1921 | Box 50 \ 3 Scan111 | |
| Letter from Rolls-Royce of America discussing experiments and suggestions for improving the hot spot throttle design. | 21th Jul 1921 | Box 50 \ 3 Scan112 | |
| Design of an exhaust choke valve and its control for the 40/50 chassis. | 25th Jun 1921 | Box 50 \ 3 Scan113 | |
| The distribution of blueprints for the 40/50 HP Chassis exhaust choke valve and control. | 28th Jun 1921 | Box 50 \ 3 Scan114 | |
| Adopting a pilot jet for easy starting over existing choker schemes. | 28th Jun 1921 | Box 50 \ 3 Scan115 | |
| Short handwritten internal memo regarding a supply. | 19th Jul 1921 | Box 50 \ 3 Scan116 | |
| Telegram concerning improvements to induction pipes for winter conditions. | 9th Jul 1923 | Box 50 \ 3 Scan117 | |
| Post Office Telegraph form regarding a 'point of contention Bogie'. | 25th Jul 1927 | Box 50 \ 3 Scan118 | |
| Modifications to the 40/50 HP chassis throttle to create a hot spot. | 1st Jul 1921 | Box 50 \ 3 Scan119 | |
| Modifications to the carburettor float feed to improve starting with poor fuel in cold weather. | 31th Jul 1921 | Box 50 \ 3 Scan120 | |
| Goshawk 11 engine unit, its completion, and a proposed review with Mr. Royce at West Wittering. | 1st Jul 1921 | Box 50 \ 3 Scan121 | |
| Cable to Springfield from Hives recommending a delay in fitting a 1' pipe. | 6th Jul 1921 | Box 50 \ 3 Scan122 | |
| Test report on a heated induction pipe fitted to the 4.EX car, detailing performance and temperature measurements. | 6th Jul 1921 | Box 50 \ 3 Scan123 | |
| The testing of a thermostat and induction pipe modification, concluding it is not recommended and proposing a more effective solution. | 6th Jul 1921 | Box 50 \ 3 Scan124 | |
| Communication detailing two cables between Platford and Hives regarding a heated induction pipe. | 7th Jul 1921 | Box 50 \ 3 Scan125 | |
| Extract of a telegram from Mr. Platford to Mr. Hives regarding an experimental scheme. | 8th Jul 1921 | Box 50 \ 3 Scan126 | |
| The development and testing of a hot spot induction system for use with low-grade gasoline. | 12th Jul 1921 | Box 50 \ 3 Scan127 | |
| Circulating a decoded cablegram from Mr. Platford regarding an experimental scheme. | 22th Jul 1921 | Box 50 \ 3 Scan128 | |
| Inter-office correspondence about using a hot spot to improve induction pipe performance for better acceleration. | 3rd Aug 1921 | Box 50 \ 3 Scan129 | |
| Cover memo attaching two documents (Oy2/G9721 and Oy2/G11721) regarding induction systems. | 21th Jan 1916 | Box 50 \ 3 Scan130 | |
| Induction systems, petrol vaporization, and crankcase dilution. | 9th Jul 1921 | Box 50 \ 3 Scan131 | |
| Comparison of crankcase oil dilution using different oils, fuels, and choker systems on Springfield chassis. | 9th Jul 1921 | Box 50 \ 3 Scan132 | |
| Report discussing crankcase dilution, fuel quality, vaporization, and engine performance. | 9th Jul 1921 | Box 50 \ 3 Scan133 | |
| Engine detonation, carbon deposits, and the desirable features for an induction pipe design. | 9th Jul 1921 | Box 50 \ 3 Scan134 | |
| Letter discussing modifications to an engine's inlet and exhaust system. | 11th Jul 1921 | Box 50 \ 3 Scan135 | |
| Letter from Rolls-Royce of America suggesting a 're-atomiser' venturi design for induction systems. | 11th Jul 1921 | Box 50 \ 3 Scan136 | |
| Translated cable from Mr. Olley regarding a hot throttle induction pipe and experiments. | 1st Aug 1921 | Box 50 \ 3 Scan137 | |
| Communication regarding a request from America for models and drawings of a heated throttle. | 6th Aug 1921 | Box 50 \ 3 Scan138 | |
| Modifications to the throttle induction pipe to improve engine performance with poor quality petrol. | 8th Aug 1921 | Box 50 \ 3 Scan139 | |
| Telegram concerning production delays due to missing drawings and the potential reputational damage from falling gasoline quality. | 25th Aug 1921 | Box 50 \ 3 Scan140 | |
| Letter to the Managing Director about experiments with a heated induction pipe on the 4-EX model, discussing performance improvements and pre-ignition issues. | 9th Aug 1921 | Box 50 \ 3 Scan141 | |
| Engine performance issues related to fuel pipe design, cooling effects of the fan, and gasoline detonation characteristics. | 9th Aug 1921 | Box 50 \ 3 Scan142 | |
| The urgent need for an improved heated pipe for winter vehicle operation. | 12th Aug 1921 | Box 50 \ 3 Scan143 | |
| Coded telegram sent from Springfield, Massachusetts to Derby regarding gasoline quality. | 12th Aug 1921 | Box 50 \ 3 Scan144 | |
| Coded telegram message sent via the Post Office. | 21th Aug 1921 | Box 50 \ 3 Scan145 | |
| List of telegraphic code words and their corresponding translations. | 21th Aug 1921 | Box 50 \ 3 Scan146 | |
| List of five-letter code words and their decoded English equivalents, likely for use in telegrams. | 21th Aug 1921 | Box 50 \ 3 Scan147 | |
| Decoded message concerning a situation that could irreparably damage reputation. | 11th Aug 1921 | Box 50 \ 3 Scan148 | |
| Coded cablegram from Rolls-Royce of America to Derby regarding production delays and potential reputational damage. | 11th Aug 1921 | Box 50 \ 3 Scan149 | |
| Letter discussing the introduction of a butterfly valve to the hot spot induction pipe to improve performance in cold weather. | 1st Aug 1921 | Box 50 \ 3 Scan150 | |
| Extract detailing a cabled request for an experimental exhaust heated throttle scheme for testing. | 13th Aug 1921 | Box 50 \ 3 Scan151 | |
| Letter detailing dynamometer tests on fuel condensation in an induction pipe and its effects on engine performance during cold starts. | 18th Aug 1921 | Box 50 \ 3 Scan152 | |
| Scheme for an exhaust-heated fuel chamber to improve engine starting and performance. | 1st Jun 1921 | Box 50 \ 3 Scan153 | |
| Test results for an exhaust-heated throttle using a 5% paraffin fuel mixture. | 1st Jun 1939 | Box 50 \ 3 Scan154 | |
| Table of test results logging radiator and throttle temperatures under various driving conditions. | 16th Aug 1921 | Box 50 \ 3 Scan155 | |
| Test report on cylinder deposits from a 1EX car fitted with an exhaust heated throttle using 5% paraffin. | 16th Aug 1921 | Box 50 \ 3 Scan156 | |
| Test log sheet recording results from a series of tests, numbered 20 to 24, with associated atmospheric conditions and dates. | 22th Aug 1921 | Box 50 \ 3 Scan157 | |
| Tests on an exhaust heated throttle and the collection of liquid petrol. | 18th Aug 1921 | Box 50 \ 3 Scan158 | |
| Fuel distribution tests comparing a standard induction pipe with one fitted with weirs and bottles. | 18th Aug 1921 | Box 50 \ 3 Scan159 | |
| Petrol distribution issues, methods for draining excess fuel, and observational tests on cylinders. | 18th Aug 1921 | Box 50 \ 3 Scan160 | |
| Experiments observing the condition of the fuel mixture in cylinders at varying throttle temperatures. | 18th Aug 1921 | Box 50 \ 3 Scan161 | |
| Laboratory report comparing the percentage distillate of two different petrol spirits at various temperatures. | 11th Aug 1921 | Box 50 \ 3 Scan162 | |
| Cold weather engine operation, focusing on shutters, thermostats, and the use of alcohol as an anti-freeze. | 19th Aug 1921 | Box 50 \ 3 Scan163 | |
| Comparison of the evaporation properties of American and English gasoline. | 19th Aug 1921 | Box 50 \ 3 Scan164 | |
| Letter responding to 'U.S.A. Complaints' by comparing the performance of American and European cars under different conditions. | 19th Aug 1921 | Box 50 \ 3 Scan165 | |
| Letter from Rolls Royce of America comparing the evaporation rates of American and English gasoline. | 25th Aug 1921 | Box 50 \ 3 Scan166 | |
| The progress of induction pipes, including tests on hand-made pieces and the dispatch of model parts to Springfield. | 25th Aug 1921 | Box 50 \ 3 Scan167 | |
| Letter discussing the analysis of fuel collected from induction pipes to test a vaporizer scheme and improve fuel distribution. | 27th Aug 1921 | Box 50 \ 3 Scan168 | |
| Test report on a new pipe and vaporizer scheme, detailing issues with engine loading and liquid fuel collection. | 27th Aug 1921 | Box 50 \ 3 Scan169 | |
| Engine performance regarding cold starts, crankcase dilution, and vaporizer tests. | 27th Aug 1921 | Box 50 \ 3 Scan170 | |
| Letter confirming the fitting of six sets of a device to demonstration cars for observation. | 27th Aug 1921 | Box 50 \ 3 Scan171 | |
| The results of testing a hot spot throttle and induction pipe system for collecting liquid petrol. | 30th Aug 1921 | Box 50 \ 3 Scan172 | |
| Test results of a hot spot throttle and suggesting design improvements to address loading up, miss-firing, and crankcase dilution issues. | 30th Aug 1921 | Box 50 \ 3 Scan173 | |
| List of modifications to resolve sparking plug fouling and carburation issues. | 30th Aug 1921 | Box 50 \ 3 Scan174 | |
| Instructions for modifying a throttle with an exhaust-heated jacket and controls for a butterfly valve. | 1st Aug 1921 | Box 50 \ 3 Scan175 | |
| Laboratory report on two samples of petrol, showing percentage of distillate at various temperatures. | 30th Aug 1921 | Box 50 \ 3 Scan176 | |
| Letter discussing the ideal shape of induction pipes, with a sketch of a proposed design. | 30th Aug 1921 | Box 50 \ 3 Scan177 | |
| Future engine design possibilities, including exhaust, carburettor placement, and a comparison of magneto versus battery ignition systems. | 21th Jun 1921 | Box 50 \ 3 Scan178 | |
| Conceptual sketch and notes proposing engine modifications, including ignition control and manifold design. | 21th Jun 1921 | Box 50 \ 3 Scan179 | |
| Induction pipe tests of the 'Dorris scheme' for vaporizing petrol which clings to the pipe walls. | 1st Sep 1921 | Box 50 \ 3 Scan180 | |
| Engine performance using a mixture of paraffin and petrol, comparing different fuel heating and starting schemes. | 1st Sep 1921 | Box 50 \ 3 Scan181 | |
| Tests of an exhaust heated throttle and draining scheme, comparing its performance against a standard engine and a 20% mixture. | 1st Sep 1921 | Box 50 \ 3 Scan182 | |
| Engine valve tests, focusing on optimal opening angle, seasonal adjustments, and thermostat control. | 1st Sep 1921 | Box 50 \ 3 Scan183 | |
| Test results for a 40/50 engine, detailing the effect of throttle temperature on liquid petrol collection and horsepower. | 1st Sep 1921 | Box 50 \ 3 Scan184 | |
| Test results for a 40/50 engine on a test bench, examining performance with an exhaust heated throttle at 500 and 2000 RPM. | 1st Sep 1921 | Box 50 \ 3 Scan185 | |
| Hand-drawn diagram showing collectors fitted to an induction pipe for petrol drainage. | 1st Sep 1921 | Box 50 \ 3 Scan186 | |
| Graph of distillation curves comparing Shell Mex with paraffin, U.S.A. Socony Winter Quality, and U.S.A. Commercial Low Test fuels. | 1st Sep 1921 | Box 50 \ 3 Scan187 | |
| From HS to OY quoting Mr. C.F. Kettering on the problem of 'distribution' in engine design. | 1st Sep 1921 | Box 50 \ 3 Scan188 | |
| Pre-ignition issues caused by overheated Champion spark plugs. | 1st Sep 1921 | Box 50 \ 3 Scan189 | |
| Continued discussion on spark plug selection for car and aero engines and other engine improvements. | 5th Sep 1921 | Box 50 \ 3 Scan190 | |
| Proposal for an exhaust heated throttle and fuel collection system to handle poor quality gasoline. | 7th Sep 1921 | Box 50 \ 3 Scan191 | |
| The examination of Goshawk 11, detailing a cracked induction pipe and performance after its replacement. | 12th Sep 1921 | Box 50 \ 3 Scan192 | |
| Cracked Goshawk induction pipe that was causing poor slow running. | 12th Sep 1921 | Box 50 \ 3 Scan193 | |
| Letter from Rolls-Royce of America discussing pre-ignition issues with Champion ignition plugs. | 20th Sep 1921 | Box 50 \ 3 Scan194 | |
| The performance issues of an experimental exhaust heated throttle, specifically concerning poor fuel distribution in a cold engine. | 20th Sep 1921 | Box 50 \ 3 Scan195 | |
| Continued memorandum discussing a delay in sending model pieces to Springfield. | 20th Sep 1921 | Box 50 \ 3 Scan196 | |
| Modification to an exhaust heated throttle by altering its internal contour. | 23th Sep 1921 | Box 50 \ 3 Scan197 | |
| Confirmation of a telegram arranging a meeting to discuss a winter programme, including louvres, a heated throttle, and a choker scheme. | 10th Oct 1921 | Box 50 \ 3 Scan198 | |
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