Rolls-Royce Archives
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Rolls-Royce Experimental Archives                
Choose Archive


Browsing Records        Page 1617 of 2367        Sort by   Box   Date   Description

Filter      from        to             identifier   [all]
DescriptionDateIdentifier
Requesting an official order be placed with Dobbie McInnes and Clyde Ltd. for six valve discs for a Farnborough Indicator.6th Mar 1939Box 134 \ 1  scan0137
Letter from the Experimental Department requesting spare valve discs and material information.6th Mar 1939Box 134 \ 1  scan0138
Status update memo on various components for the Single Cylinder Bentley project.11th Mar 1939Box 134 \ 1  scan0139
Order request for an 'A' type indicator valve and six spare valve discs for a Single Cylinder Bentley.17th Mar 1939Box 134 \ 1  scan0140
Typed letter requesting the urgent supply of a Farnborough Indicator valve and spare parts.17th Mar 1939Box 134 \ 1  scan0141
Required drawings and parts for modifying a Bentley 11 cylinder head.13th Mar 1939Box 134 \ 1  scan0142
Instructing the development and testing of new cylinder and piston designs for a Bentley S/C unit.17th Mar 1939Box 134 \ 1  scan0143
Analysis of a direct injection combustion chamber and multi-hole nozzle from the National Gas & Oil Engine Co.18th Mar 1939Box 134 \ 1  scan0144
Continuation of notes on engine nozzles, shrouded valves, fuel pumps, and superchargers.18th Mar 1939Box 134 \ 1  scan0145
The order of twelve corrujoint washers for a Single Cylinder Bentley.23th Mar 1939Box 134 \ 1  scan0146
The requirements for adapting a single-cylinder Bentley engine head for testing various compression ratios and throat sizes.25th Mar 1939Box 134 \ 1  scan0147
Outstanding and delayed parts for a single cylinder Bentley unit.27th Mar 1939Box 134 \ 1  scan0148
Requesting to fit up a charging plant on a test bed for a Bentley S/C Unit.30th Mar 1939Box 134 \ 1  scan0149
Listing outstanding jobs for the single cylinder unit and requesting estimated completion dates.30th Mar 1939Box 134 \ 1  scan0150
General programme of work for a single cylinder unit.30th Mar 1939Box 134 \ 1  scan0151
Programme of tests for a single cylinder unit, including coolant, gasket, and new cylinder head evaluations.1st Apr 1939Box 134 \ 1  scan0152
Engine testing procedures for fuel consumption, ignition curves, and the effect of distance between the head and piston.1st Apr 1939Box 134 \ 1  scan0153
Specification sheet for Beardmore and other railcar engines.4th Apr 1939Box 134 \ 1  scan0154
List of engine specifications used by various international railway companies.4th Apr 1939Box 134 \ 1  scan0155
The investigation of detonation indication on single cylinder units using a Cathode-ray unit.12th Apr 1939Box 134 \ 1  scan0156
Asking for the current status of various engine components and systems.19th Apr 1939Box 134 \ 1  scan0157
Request to mark up a print of a Bentley single cylinder head to conform to the design of a Wraith cylinder head.26th Apr 1939Box 134 \ 1  scan0158
Request to modify an existing Bentley Single Cylinder Head to conform to Wraith lll specifications.27th Apr 1939Box 134 \ 1  scan0159
Design for 'dieselising' the S/C unit, including the cylinder head and piston arrangement.16th May 1939Box 134 \ 1  scan0160
Request to investigate the design changes required to convert a 4¼-litre high-power engine into a 3½-litre unit.17th May 1939Box 134 \ 1  scan0161
Seeking payment approval for an invoice for a die from The Southwark Manufacturing Co.18th May 1939Box 134 \ 1  scan0162
Agreeing to pass the cost of Corrujoint dies bought from The Southwark Manufacturing Co. for payment.23th May 1939Box 134 \ 1  scan0163
The status of the 3¼ bore High Power Engine and whether castings can be instructed.25th Sep 1939Box 134 \ 1  scan0164
The investigation and redesign of high power cylinder heads.12th Oct 1939Box 134 \ 1  scan0165
Comparison of engine head modifications and their performance characteristics.12th Oct 1939Box 134 \ 1  scan0166
The development and testing of a modified cylinder head, detailing iterative changes to its compression ratio and performance characteristics.12th Oct 1939Box 134 \ 1  scan0167
Blueprint illustrating three stages of modification to a mechanical component, showing plan and cross-section views.26th May 1939Box 134 \ 1  scan0168
Performance comparison graph for a B.60 cylinder head.26th May 1939Box 134 \ 1  scan0169
Performance graph comparing cylinder head configurations for the B.60 No. 3 unit.26th May 1939Box 134 \ 1  scan0170
Performance comparison graph for a B.60 cylinder head under various configurations.26th May 1939Box 134 \ 1  scan0171
Specification sheet for a White 12-cylinder horizontally opposed bus engine.2nd Dec 1939Box 134 \ 1  scan0172
Issue of excessive blow-by in high power engines, its effects, and proposed solutions for the piston ring set-up.2nd Dec 1939Box 134 \ 1  scan0173
List of questions regarding high power engine performance, cylinder wear, and blow-by.2nd Dec 1939Box 134 \ 1  scan0174
Plating recommendations for C.I. liners to be cast in aluminium brake drums.3rd Jan 1941Box 134 \ 1  scan0175
Letter from The Stainless Spinning Works confirming the despatch of Plate Springs RG.2909.26th Feb 1942Box 134 \ 1  scan0176
Short typed message regarding an arrival by road at a specific time.15th Mar 1940Box 134 \ 1  scan0177
Message to NIPSA in Bury, Lancashire, arranging a meeting to discuss engine design problems.14th May 1940Box 134 \ 1  scan0178
Brief typed telex message arranging a meeting for the following Friday.5th Jun 1940Box 134 \ 1  scan0179
Telegram confirming the arrival details for Mr. Robotham.10th Oct 1940Box 134 \ 1  scan0180
Telegram received by telephone regarding an arrival for the attention of Robotham.1st Oct 1940Box 134 \ 1  scan0181
Telegram received by telephone confirming the arrival of Mr. Robotham.1st Oct 1940Box 134 \ 1  scan0182
Technical report on Mercedes Benz dry cylinder liners.3rd Oct 1940Box 134 \ 1  scan0183
Sketch of a Mercedes-Benz dry liner with dimensions and material hardness.3rd Oct 1940Box 134 \ 1  scan0184
Advantages and disadvantages of two types of high power cylinder heads.9th Sep 1940Box 134 \ 1  scan0185
Research into improving engine volumetric efficiency and power output.15th Jan 1944Box 134 \ 1  scan0186
The creation of a separate file for letters concerning Aspin Cylinder Heads.13th Mar 1944Box 134 \ 1  scan0187
Letter from F. M. Aspin & Co. Ltd. to W. A. Robotham regarding engine developments.13th Mar 1944Box 134 \ 1  scan0188
Letter declining an offer to convert a Bentley engine and putting the project on hold.8th Mar 1944Box 134 \ 1  scan0189
Letter from F. M. Aspin & Co. Ltd. to W. A. Robotham acknowledging a letter and offering to undertake a complete job.28th Feb 1944Box 134 \ 1  scan0190
Letter postponing work on the Aspin head experiment project for various reasons.23th Feb 1944Box 134 \ 1  scan0191
Letter from F. M. Aspin & Co. Ltd. to W. A. Robotham regarding a previously sent letter and power curve.21th Feb 1944Box 134 \ 1  scan0192
Letter from F.M. Aspin & Co. discussing a cylinder head collaboration and engine performance metrics.5th Feb 1944Box 134 \ 1  scan0193
Letter from F. M. Aspin & Co. Ltd. detailing engine performance after 1,000 power hours and a recent facility expansion.22th Sep 1943Box 134 \ 1  scan0194
Performance curve graph for an Engine Series TA6 6 Cylinder with atmospheric induction.22th Sep 1943Box 134 \ 1  scan0195
Confidential letter to Maurice Platt of Vauxhall Motors regarding the Aspin head and valve development.21th Feb 1944Box 134 \ 1  scan0196
Confidential letter from Vauxhall Motors discussing test results and failures of various Aspin project engines.14th Feb 1944Box 134 \ 1  scan0197
Report page detailing the performance, modifications, and issues with a converted Vauxhall Ten engine featuring an Aspin rotary valve head.14th Feb 1944Box 134 \ 1  scan0198
Concluding page of a letter detailing engine performance metrics and development work since 1940.5th Feb 1944Box 134 \ 1  scan0199
Letter from F.M. Aspin & Co. Ltd. to W.A. Robotham discussing the manufacture and performance of a Cylinder Head.5th Feb 1944Box 134 \ 1  scan0200
Continuation sheet of a letter from F. M. Aspin & Co. Ltd. discussing engine performance and company expansion.22th Sep 1943Box 134 \ 1  scan0201
Performance curve graph for an Engine Series TA 6, a 6-cylinder engine with atmospheric induction.22th Sep 1943Box 134 \ 1  scan0202
Letter from Vauxhall Motors concerning tests on an Aspinized Vauxhall engine.1st Feb 1944Box 134 \ 1  scan0203
Letter to F.W. Aspin regarding a contract to develop an engine with an Aspin head for the Ministry of Supply.31th Jan 1944Box 134 \ 1  scan0204
Secret letter to Maurice Platt of Vauxhall Motors requesting information on an engine produced with Aspin's valve gear.29th Jan 1944Box 134 \ 1  scan0205
Letter from Briggs Motor Bodies Limited to W. A. Robotham congratulating him on an appointment and discussing the Aspin Engine.12th Nov 1941Box 134 \ 1  scan0206
Graph and diagrams comparing two-stroke engine valve opening areas for various valve designs.28th Jun 1940Box 134 \ 1  scan0207
Letter from F.M. Aspin & Co. Ltd. requesting a review of a Centrifugal Supercharger design.16th Oct 1940Box 134 \ 1  scan0208
Letter from F.M. Aspin & Co. Ltd. discussing job specifications, drawings, and cost estimates for cylinder components.15th Oct 1940Box 134 \ 1  scan0209
Letter declining to disclose development work on centrifugal superchargers.18th Oct 1940Box 134 \ 1  scan0210
Letter from F.M. Aspin & Co. Ltd. returning an inadvertently taken Visitor's Pass.3rd Oct 1940Box 134 \ 1  scan0211
Requesting the location of a pattern to modify a cylinder block for Aspin's cylinder head.25th Sep 1940Box 134 \ 1  scan0212
Agreement to fit an Aspin head to an overhead camshaft Bentley engine.15th Sep 1940Box 134 \ 1  scan0213
Patent inquiry for a principle applying acceleration and deceleration to a rotary valve.10th Jul 1940Box 134 \ 1  scan0214
Letter from F.M. Aspin & Co. Ltd. acknowledging receipt of a letter and diagram, promising an attractive proposition.8th Jul 1940Box 134 \ 1  scan0215
From Rm. to Jnr. discussing a review of the Aspin valve and its potential for engine designs.8th Jul 1940Box 134 \ 1  scan0216
Design, performance and mechanical limitations of the Aspin rotary valve.6th Jul 1940Box 134 \ 1  scan0217
Letter to F. M. Aspin & Co. Ltd. discussing attempts to determine the orifice coefficient of a valve and port.3rd Jul 1940Box 134 \ 1  scan0218
Letter from F.M. Aspin & Co. discussing port design and proposing a flow measurement test against poppet valves.29th Jun 1940Box 134 \ 1  scan0219
Continuation sheet of a letter from F. M. Aspin & Co. Ltd. requesting information.29th Jun 1940Box 134 \ 1  scan0220
Graph comparing poppet valve and Aspin engine port areas against timing angle in degrees.21th Jun 1940Box 134 \ 1  scan0221
Aspin valve design, its poor volumetric efficiency, and potential use in 2-stroke engines.28th Jun 1940Box 134 \ 1  scan0222
Letter to Mr. Aspin comparing the breathing capacity of his Aspin valve to a standard poppet valve for aviation engines.28th Jun 1940Box 134 \ 1  scan0223
Letter to F.M. Aspin comparing the breathing capacity of his Aspin valve against the standard poppet valve for aviation engines.28th Jun 1940Box 134 \ 1  scan0224
Valve timing and design characteristics for the Aspin valve engine.21th Jun 1940Box 134 \ 1  scan0225
Comparing the Aspin engine's valve timing and performance against the B.60 and Merlin engines.18th Jun 1940Box 134 \ 1  scan0226
Letter from F.M. Aspin & Co. Ltd. enclosing drawing No. C.144 for engine porting and discussing experimental work.14th Jun 1940Box 134 \ 1  scan0227
Letter from F.M. Aspin to W.A. Robotham discussing a drawing for engine porting and a valve opening diagram.14th Jun 1940Box 134 \ 1  scan0228
Comparison of valve port areas for various engines, including the Aspin valve and the B.60.10th Jun 1940Box 134 \ 1  scan0229
Letter to Mr. F. Aspin cancelling a visit and halting development work due to the serious situation in France.24th May 1940Box 134 \ 1  scan0230
Cover letter from F. M. Aspin & Co. Ltd. regarding a print of a rotor from an engine.23th May 1940Box 134 \ 1  scan0231
Photograph showing a rotor taken from a 4 1/8' bore by 6' stroke engine.17th May 1940Box 134 \ 1  scan0232
Design work, challenges, and questions regarding the Aspin engine.17th May 1940Box 134 \ 1  scan0233
List of questions and observations regarding engine valve and spark plug performance.17th May 1940Box 134 \ 1  scan0234
Declining research on the Aspin Valve Gear due to existing research commitments.16th May 1940Box 134 \ 1  scan0235
Visit to Aspin regarding engine conversion, design issues with cylinder stud positioning, and a new layout at Blounts Mill.15th May 1940Box 134 \ 1  scan0236


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙