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).
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DescriptionDateIdentifier
Performance table comparing various bonnet ventilation configurations at different speeds.25th Nov 1924Box 22 \ 1  Scan219
Comparative analysis of cooling system performance for Hispano and 40/50 models under various conditions.25th Nov 1924Box 22 \ 1  Scan220
Test data tables on the cooling efficiency of a 40/50 HP engine, examining the effects of speed, matrix/shutter configuration, and fuel mixture strength.17th Feb 1925Box 22 \ 1  Scan221
Comparing EAC and Hispano steering systems and providing a status update on various car projects.17th Feb 1925Box 22 \ 1  Scan222
Comparison of steering effort for a 93NK chassis versus a Hispano Suiza chassis.16th Feb 1925Box 22 \ 1  Scan223
The heavy steering issue in the E.A.C. 'V' series car, comparing it with the 40/50 and Hispano models.13th Mar 1925Box 22 \ 1  Scan224
Comparing the steering effort and components of Hispano and EAC cars against the 40/50 model.3rd Mar 1925Box 22 \ 1  Scan225
Secret internal memorandum discussing the difference in 'V' series steering and the effect of weight lifting.18th Mar 1925Box 22 \ 1  Scan226
Secret memorandum discussing heavy steering issues, comparing steering box types, and proposing various solutions.23th Mar 1925Box 22 \ 1  Scan227
Continued memo discussing design options for a pendulum lever shaft and associated components.26th Mar 1925Box 22 \ 1  Scan228
Graph showing the load in the side steering tube against tyre pressure for a Hispano-Suiza steering system.26th Mar 1925Box 22 \ 1  Scan229
Comparison of steering leverage between the E.A.C.V Series and Hispano steering systems.26th Mar 1925Box 22 \ 1  Scan230
Road tests for the Hispano steering system, measuring loads in the steering tube during turns.26th Mar 1925Box 22 \ 1  Scan231
List of required files, detailing reference numbers and their corresponding subject matter.26th Mar 1925Box 22 \ 1  Scan232
List of various engine components with associated part and reference numbers.26th Mar 1925Box 22 \ 1  Scan233
Reverse of a photograph identifying a key plan for an engine.26th Mar 1925Box 22 \ 1  Scan234
List of parts and reference numbers taken to a location named Clan on a Monday.1st Apr 1925Box 22 \ 1  Scan235
'EAC' steering, detailing the force required to make turns at speed compared to other models.1st Apr 1925Box 22 \ 1  Scan236
Comparing steering effort in lbs for left and right turns on various car models with different tyre pressures and axle weights.6th Apr 1925Box 22 \ 1  Scan237
Tests conducted to address heavy and unstable steering issues.25th Sep 1924Box 22 \ 1  Scan238
Steering efficiency, wear, and leverage.6th Apr 1925Box 22 \ 1  Scan239
Graph showing the percentage increase of leverage for Hispano steering relative to the E.A.C. V series.8th Mar 1928Box 22 \ 1  Scan240
Graph showing the experimental results of Hispano-Suiza steering leverage.6th Apr 1928Box 22 \ 1  Scan241
Graph of steering leverage versus steering wheel rotation for the E.A.C. V series.6th Apr 1925Box 22 \ 1  Scan242
Design, performance issues, and potential improvements for the 'V' Series steering system.15th Apr 1925Box 22 \ 1  Scan243
Technical note on steering geometry, specifically addressing leverage on the L.H. lock.14th May 1925Box 22 \ 1  Scan244
Vehicle overheating complaint and the value of historical test data.14th May 1925Box 22 \ 1  Scan245
Cooling test methods and the reasons for abandoning louvered bonnets.14th May 1925Box 22 \ 1  Scan246
Engine overheating, analysing the effects of fan belt tension and gear selection when hill climbing.14th May 1925Box 22 \ 1  Scan247
Potential reasons for a car overheating due to a different driving method.14th May 1925Box 22 \ 1  Scan248
Chart comparing overheating test results for the Silver Ghost and Hispano Suiza models.14th May 1925Box 22 \ 1  Scan249
Arrangement diagram for a Hispano-Suiza steering box in a car.24th Jan 1918Box 22 \ 1  Scan250
Confirming a verbal arrangement to adapt batteries for a Hispano car.20th Jun 1925Box 22 \ 1  Scan251
Comparing their steering system with Hispano's and discussing potential improvements.29th Jun 1925Box 22 \ 1  Scan252
Steering system improvements, including a new pendulum lever design and competitor analysis.7th Jul 1925Box 22 \ 1  Scan253
Quarterly note regarding the disposal of Hispano and Mercedes cars from the Experimental Department.7th Jul 1925Box 22 \ 1  Scan254
Cross-sectional drawing of a Hispano type side steering tube with dimensions and load specifications.8th Jul 1925Box 22 \ 1  Scan255
Explaining the continued use of Hispano and Mercedes cars for experimental purposes.8th Jul 1925Box 22 \ 1  Scan256
Technical memorandum discussing different steering gear designs, including irreversible boxes and the Marles system.10th Jul 1925Box 22 \ 1  Scan257
The disapproval of bonnet louvres on Mr. Royce's car and a request for new drawings.14th Jul 1925Box 22 \ 1  Scan258
Request to determine the instantaneous steering leverage on a Hispano car at full left-hand lock.6th Jul 1925Box 22 \ 1  Scan259
Investigating and damping low and high speed steering wobbles.17th Jul 1925Box 22 \ 1  Scan260
Steering oscillation, the effect of a damped pendulum lever, and weak buffer springs.17th Jul 1925Box 22 \ 1  Scan261
Graph chart recording of a battery discharge test with handwritten calculations.22th Jul 1925Box 22 \ 1  Scan262
Design and fitment of bonnet louvres for the New Phantom model.25th Aug 1925Box 22 \ 1  Scan263
The discharge tests performed on a Hispano Suiza battery.13th Aug 1925Box 22 \ 1  Scan264
Instruction sheet noting a battery is in good condition and ready to be refitted.5th Dec 1922Box 22 \ 1  Scan265
Requesting information on the maximum distance between the wheel contact point and pivot for a new, lighter front axle design.1st Sep 1925Box 22 \ 1  Scan266
High-speed steering wobbles in a Hispano Suiza vehicle.10th Sep 1925Box 22 \ 1  Scan267
High-speed steering wobbles, comparing tests on a Hispano car with a Phantom.11th Sep 1925Box 22 \ 1  Scan268
Investigating high-speed wobbles by comparing a Hispano car to an EAC and testing steering modifications.14th Sep 1925Box 22 \ 1  Scan269
Investigating wheel wobble using a dynamometer and chronograph.14th Sep 1925Box 22 \ 1  Scan270
Comparing the weights of front axle and brake components.17th Sep 1925Box 22 \ 1  Scan271
Page 2, comparing the weights of hub and wheel components for different models.9th Sep 1925Box 22 \ 1  Scan272
Design and effectiveness of a louvered bonnet compared to shutters.1st Sep 1925Box 22 \ 1  Scan273
Problems with Autovac tanks, suggesting modifications, and requesting further designs.28th Sep 1925Box 22 \ 1  Scan274
Urgent order request for searchlight lamps to be used on a Hispano-Suiza car.19th Jan 1926Box 22 \ 1  Scan275
Four broad improvements made to the New Phantom steering system.4th Mar 1926Box 22 \ 1  Scan276
Improvements to a worm and nut mechanism, including lubrication, thread design, and comparison to a Hispano model.17th Apr 1926Box 22 \ 1  Scan277
Technical memorandum discussing the design, performance, and potential improvements of the E.A.C. steering system.17th Apr 1926Box 22 \ 1  Scan278
Urgent internal request to order searchlight lamps for a Hispano car.30th Sep 1926Box 22 \ 1  Scan279
To the Pattern Shop requesting a new battery box for an experimental Hispano chassis.4th Jan 1927Box 22 \ 1  Scan280
Engine detonations on a Hispano engine.25th Jan 1927Box 22 \ 1  Scan281
Request to the Pattern Shop to make a new battery box for an experimental Hispano chassis.25th Feb 1927Box 22 \ 1  Scan282
Tests and observations on high-speed wobbles, particularly the ineffectiveness of front shock dampers under certain tyre conditions.14th Jun 1927Box 22 \ 1  Scan283
Results of tests on vehicle wobble, frame twisting, and the effects of engine mass, inertia, and shock dampers.14th Jun 1927Box 22 \ 1  Scan284
Test report page comparing oscillation and wobble characteristics between an EAC.V11 and a Hispano car.14th Jun 1927Box 22 \ 1  Scan285
Methods to eliminate high-speed wobbles by adjusting front and rear dampers and frame stiffness.14th Jun 1927Box 22 \ 1  Scan286
Blueprint graph and diagrams illustrating frame rigidity and periodicity tests.5th Jul 1927Box 22 \ 1  Scan287
Instruction memo regarding work to be carried out on a Hispano-Suiza car by Sanderson & Holmes Ltd.5th Jul 1927Box 22 \ 1  Scan288
Correction regarding the torsional stiffness of the Hispano frame compared to the 40/50 model in relation to high-speed wobbles.11th Jul 1927Box 22 \ 1  Scan289
Return of a re-painted Hispano Suiza car for selling purposes.1st Aug 1927Box 22 \ 1  Scan290
Short internal memo acknowledging the contents of a communication regarding a Hispano Suiza car.1st Sep 1927Box 22 \ 1  Scan291
Design characteristics of 'Straight Eight' and 'Hispano Six' engines.7th Sep 1927Box 22 \ 1  Scan292
Inquiry regarding the expected arrival of a Hispano Suiza car for sale.21th Sep 1927Box 22 \ 1  Scan293
Delay in sending a Hispano Suiza car due to engine experiments.22th Sep 1927Box 22 \ 1  Scan294
Report comparing the weight of tubular section connecting rods and piston assemblies of Rolls Royce, Hispano, and Lorraine cars.18th Oct 1927Box 22 \ 1  Scan295
Comparison table of engine component specifications for 20 HP, Lorraine, 40/50 HP, and Hispano models.1st Nov 1927Box 22 \ 1  Scan296
Instruction to Lillie Hall to receive one Hispano Suiza car for the Sales Department.1st Nov 1927Box 22 \ 1  Scan297
Sending a Hispano car to Lillie Hall to be sold.11th Nov 1927Box 22 \ 1  Scan298
Receiving a Hispano Suiza car for the Sales Department, with a handwritten note of receipt and a fault.1st Nov 1927Box 22 \ 1  Scan299
Technical discussion on the design of the EAC.10 induction pipe and cylinder head, comparing 4-port and 6-port arrangements.17th Jan 1928Box 22 \ 1  Scan300
Page discussing the use of an undertype slot for 4 or 6 port induction pipes, referencing blueprint LeC.2509.17th Jan 1928Box 22 \ 1  Scan301
Valve lift diagrams, formulas, and clearances for car and aero engines.17th Jan 1928Box 22 \ 1  Scan302
Improvements to the Phantom steering system, including customer feedback and comparisons with other cars.1st Apr 1928Box 22 \ 1  Scan303
Steering characteristics, skid correction, parking, and comparisons between different car models.25th Apr 1928Box 22 \ 1  Scan304
Improvements for the 'Phantom' steering system, comparing it to Hispano-Suiza steering and suggesting hydraulic damping.25th Apr 1928Box 22 \ 1  Scan305
Offer from Solex to test their carburetters.28th Apr 1928Box 22 \ 1  Scan306
Inquiry regarding a tyre inflation pump for the Phantom model.7th Jun 1928Box 22 \ 1  Scan307
The nitrogenisation of steel process for crankshafts and cylinders observed at the Hispano Works.1st Oct 1928Box 22 \ 1  Scan308
The nitrogen hardening process observed at the Aubert & Duval plant, detailing its application on automotive and aero parts.1st Oct 1928Box 22 \ 1  Scan309
Cheap and simple steel hardening process, its benefits over case-hardening, and potential collaboration with French and British partners.31th Dec 1928Box 22 \ 1  Scan310
Sample of a French Hispano cylinder made with a nitrided alloy, sent for comparative testing.31th Dec 1928Box 22 \ 1  Scan311
Confirming that cylinder liners were ground after hardening to remove the brittle surface.1st Jan 1929Box 22 \ 1  Scan312
Brittle surface layer on nitro alloy steel and the necessity of grinding after nitriding.4th Feb 1929Box 22 \ 1  Scan313
Letter from Aubert & Duval discussing the grinding of nitro-hardened steel components.20th Aug 1923Box 22 \ 1  Scan314
Visit by Sir Henry Seagrave with a new Hispano Suiza 'Barcelona' model, detailing its specifications and a test run comparison.20th Aug 1923Box 22 \ 1  Scan315
Test report assessing a car's acceleration, maximum speed, steering, and braking characteristics.20th Aug 1923Box 22 \ 1  Scan316
Summary of test results comparing a Hispano sports car to a modified Continental Phantom, focusing on braking and overall performance.19th Jul 1930Box 22 \ 1  Scan317
Letter to Capt. Owen of Jack Barclay & Co. Ltd., comparing the cooling of a 'Hispano' car with the Phantom II and inviting him to the works.19th Jul 1930Box 22 \ 1  Scan318


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