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
Comparing detonation in Hispano and EAC engines.1st Feb 1924Box 22 \ 1  Scan119
Secret internal memorandum requesting further information on Hispano steering characteristics and comparing pivot inclinations.27th Feb 1924Box 22 \ 1  Scan120
Comparing springs in the side steering tube of a Hispano car with the standard 40/50 model.29th Feb 1924Box 22 \ 1  Scan121
Secret memorandum discussing the advantages of a modified semi-servo brake system over other patents and previous designs.1st Mar 1924Box 22 \ 1  Scan122
Continued memorandum on servo and braking systems, referencing Hispano and Renault patents.3rd Mar 1924Box 22 \ 1  Scan123
Describing a modified semi-servo brake operating system scheme.3rd Mar 1924Box 22 \ 1  Scan124
Brake and servo wear, angle of action and back brake equaliser design.4th Mar 1924Box 22 \ 1  Scan125
Secret memo discussing brake operation, comparing the RRM system to others, and outlining the advantages of a proposed new design.4th Mar 1924Box 22 \ 1  Scan126
Secret internal memorandum discussing improvements and alternatives for the clutch for EAC's models.4th Mar 1924Box 22 \ 1  Scan127
Different designs for a clutch brake and the necessity of a quick-stopping mechanism.7th Mar 1924Box 22 \ 1  Scan128
Design and setup of springs within a steering tube for better control and reduced wear.7th Mar 1924Box 22 \ 1  Scan129
Brakes Scheme DES.60, focusing on equal forward and backward servo operation.10th Mar 1924Box 22 \ 1  Scan130
Continued memo discussing the mechanical details of a car being tested.11th Mar 1924Box 22 \ 1  Scan131
Obtaining data from a Hispano engine.11th Mar 1924Box 22 \ 1  Scan132
Comparing the specifications and power output of Hispano and E.A.C. engines.11th Mar 1924Box 22 \ 1  Scan133
Fuel distribution and the effects of dual ignition on a Hispano engine.11th Mar 1924Box 22 \ 1  Scan134
Continuation page of a report on indicator valve performance and volumetric efficiency.12th Jul 1923Box 22 \ 1  Scan135
Indicator work and performance tests conducted on a Hispano engine.12th Jul 1923Box 22 \ 1  Scan136
Hispano indicator diagrams taken at 1500 and 2500 RPM.12th Jul 1923Box 22 \ 1  Scan137
Performance chart showing piston displacement for crank angles of a Hispano engine.4th Aug 1917Box 22 \ 1  Scan138
Small pencil sketch of a component section.12th Mar 1924Box 22 \ 1  Scan139
Indicator diagram showing piston displacement for crank angles of a Hispano engine cylinder.12th Mar 1924Box 22 \ 1  Scan140
Graph comparing the specific output of E.A.C. and Hispano engines.12th Mar 1924Box 22 \ 1  Scan141
Graph comparing B.M.E.P. against conventional gas velocity past valves for E.A.C. and Hispano engines.12th Mar 1924Box 22 \ 1  Scan142
Performance curves for a Hispano engine, detailing cooling water flow and induction pipe depression.12th Mar 1924Box 22 \ 1  Scan143
Graph comparing E.A.C. and Hispano inlet valve lift diagrams against crankshaft degrees.12th Mar 1924Box 22 \ 1  Scan144
Graph plotting inlet valve displacement against piston displacement, comparing 'Hispano' and 'E.A.C.' specifications.12th Mar 1924Box 22 \ 1  Scan145
Graph comparing ignition advance required for maximum power on E.A.C. and Hispano engines, showing the effect of synchronised dual ignition.10th Mar 1924Box 22 \ 1  Scan146
Performance curves for a Hispano engine showing horse power, efficiency, and pressures against RPM.10th Mar 1924Box 22 \ 1  Scan147
Diagrams showing the valve timing and displacement curves for a Hispano engine.10th Mar 1924Box 22 \ 1  Scan148
Load versus deflection graph for Hispano-Suiza front road springs.25th Aug 1928Box 22 \ 1  Scan149
Blank page with a red 'Print Room' stamp from Derby.25th Aug 1928Box 22 \ 1  Scan150
Test data for a Hispano servo, focusing on the ratio of torque output to input.11th Mar 1924Box 22 \ 1  Scan151
Servo efficiency and performance characteristics.1st Mar 1924Box 22 \ 1  Scan152
The particulars and performance of Hispano front springs.11th Mar 1924Box 22 \ 1  Scan153
Secret memorandum discussing the design and comparison of different brake systems, including servo-assisted and Hispano types.14th Mar 1924Box 22 \ 1  Scan154
Continued memorandum discussing stress ratios, mentioning a Mr. Stent and an item designated EAC.1.8th Apr 1924Box 22 \ 1  Scan155
List of weights in pounds and ounces for various units of a Hispano Suiza engine.8th Apr 1924Box 22 \ 1  Scan156
List of engine component weights in pounds and ounces.28th Apr 1924Box 22 \ 1  Scan157
The performance and modifications of a 4-wheel brake system.28th Apr 1924Box 22 \ 1  Scan158
The performance of two braking schemes, the 'RRM' and the 'Agreed', focusing on servo assistance and lag.28th Apr 1924Box 22 \ 1  Scan159
The operation of the brake pedal and servo assistance mechanism.28th Apr 1924Box 22 \ 1  Scan160
Comparing the 'agreed' brake scheme with a 'Hispano' system.28th Apr 1924Box 22 \ 1  Scan161
The M. DES. 60 braking scheme, its servo-related faults, and a comparison with other four-wheel brake systems.28th Apr 1924Box 22 \ 1  Scan162
Brake design improvements, patenting a new ratchet drive, and engine issues, with a comparison to a Renault model.28th Aug 1924Box 22 \ 1  Scan163
Inefficiency and weaknesses of a re-built Hispano servo motor during testing.29th Apr 1924Box 22 \ 1  Scan164
Hispano servo motor, detailing performance data after restoration.29th Apr 1924Box 22 \ 1  Scan165
Producing 'brake jaggers' on Hispano, Isotta, and Delage cars.1st May 1924Box 22 \ 1  Scan166
Brake performance, testing different brake shoes and linings to investigate the cause of 'jagger' vibrations.20th May 1924Box 22 \ 1  Scan167
Tests to prevent brake jaggers by modifying the brake shoe lining.1st May 1924Box 22 \ 1  Scan168
List of unsuccessful experiments to eliminate front wheel brake jaggers on vehicle EAC.111.1st May 1924Box 22 \ 1  Scan169
List of experiments conducted on brakes and brake carriers.1st May 1924Box 22 \ 1  Scan170
Methods to eliminate brake 'jaggers' and listing factors that do not cause the issue.1st May 1924Box 22 \ 1  Scan171
The 'RRM' scheme of brakes, discussing brake jaggering, servo operation and lag.1st May 1924Box 22 \ 1  Scan172
Comparing the driver feel and performance of the RRM braking scheme against the Hispano scheme.1st May 1924Box 22 \ 1  Scan173
Secret memo regarding the arrival of cars for testing different 4-wheel brake schemes.1st May 1924Box 22 \ 1  Scan174
Comparison table of different front wheel brake schemes and their performance characteristics.29th Apr 1924Box 22 \ 1  Scan175
Secret memo discussing experiments to avoid brake 'jaggers' by testing stiff brake drums, referencing Hispano and Isotta cars.5th Mar 1924Box 22 \ 1  Scan176
Secret memo discussing tests on a car's brake servo with a modified reduction ratio, comparing its performance to a Hispano.9th May 1924Box 22 \ 1  Scan177
Instruction sheet for Hispano-Suiza front shock absorbers with pressure specifications.15th May 1924Box 22 \ 1  Scan178
The policy and characteristics of four-wheel brake systems.21th May 1924Box 22 \ 1  Scan179
The dangers of wheel lock during braking and its effect on steering.21th May 1924Box 22 \ 1  Scan180
Continued memorandum discussing the variation in braking performance between different cars.21th May 1924Box 22 \ 1  Scan181
Request to order new Ferodo brake linings for a Hispano car, including specifications.27th May 1924Box 22 \ 1  Scan182
Confidential internal memorandum discussing the patent implications of using a plate clutch for a servo mechanism, compared to Hispano and Renault designs.23th Jun 1924Box 22 \ 1  Scan183
Querying the performance of the Hispano front axle, including bearing wear, water protection, and a description of its assembly.25th Jun 1924Box 22 \ 1  Scan184
The dispatch of a 'Hispano Pivot' for inspection.28th Jun 1924Box 22 \ 1  Scan185
Condition and removal method for pivots on a Hispano car.28th Jun 1924Box 22 \ 1  Scan186
Issue of boiling water in the 40/50 HP engine and potential solutions.21th Aug 1924Box 22 \ 1  Scan187
List of observations and questions regarding engine cooling, fan performance, and radiator design, with comparisons to a Hispano model.21th Aug 1924Box 22 \ 1  Scan188
Engine cooling improvements, comparing radiator design and water circulation with a Hispano engine.29th Aug 1924Box 22 \ 1  Scan189
Design and efficiency of car radiators for the 20 HP and 40/50 models.29th Aug 1924Box 22 \ 1  Scan190
Engine cooling issues, fan efficiency, bonnet design, and solutions to prevent boiling and water loss.22th Sep 1924Box 22 \ 1  Scan191
The heat given to the cooling water of a Hispano engine during a dynamometer test.22th Sep 1924Box 22 \ 1  Scan192
Analyzing the thermal efficiency and heat losses of a Hispano engine.22th Sep 1924Box 22 \ 1  Scan193
Energy diagram for a Hispano engine, detailing the distribution of heat energy against engine RPM.26th Sep 1924Box 22 \ 1  Scan194
Radiator tests conducted on a Hispano car.1st Sep 1924Box 22 \ 1  Scan195
The results of radiator tests conducted on a Hispano car.22th Sep 1924Box 22 \ 1  Scan196
Table of radiator test results conducted on a Hispano car, with and without the bonnet fitted.22th Sep 1924Box 22 \ 1  Scan197
Graph comparing heat flow to jacket water and heat dissipated by radiators for 40/50 HP and Hispano engines.22th Sep 1924Box 22 \ 1  Scan198
Graph comparing Heat Transfer Flow at full load for the 40/50 HP and Hispano models.22th Sep 1924Box 22 \ 1  Scan199
Leverage fluctuation of square cams in four-wheel brake systems.10th Oct 1924Box 22 \ 1  Scan200
Heat flow to jacket water on a Hispano car.13th Oct 1924Box 22 \ 1  Scan201
The effect of fuel mixture strength on engine heat flow and power output.13th Oct 1924Box 22 \ 1  Scan202
Data tables showing heat flow to jacket water for a Hispano engine under different conditions.1st Oct 1924Box 22 \ 1  Scan203
Graph of performance curves for a Hispano car, showing heat flow, horsepower, and fuel consumption against engine RPM.1st Oct 1924Box 22 \ 1  Scan204
Graph showing the reduction in heat flow with a richer mixture for a Hispano engine.1st Oct 1924Box 22 \ 1  Scan205
Internal order memo for two Ferodo friction discs for a Hispano Car.17th Oct 1924Box 22 \ 1  Scan206
Specifying the correct dimensions for Hispano car clutch lining friction discs, referencing a letter from Messrs. Ferodo.27th Oct 1924Box 22 \ 1  Scan207
Cooling investigations and radiator tests.28th Nov 1924Box 22 \ 1  Scan208
Summary on engine overheating issues at low speeds.28th Nov 1924Box 22 \ 1  Scan209
Methods for comparing radiator cooling efficiencies.25th Nov 1924Box 22 \ 1  Scan210
Radiator cooling efficiency, referencing Newton's Law of Cooling.25th Nov 1924Box 22 \ 1  Scan211
Method for testing radiator cooling performance.25th Nov 1924Box 22 \ 1  Scan212
Page summarizing radiator test results, detailing improvements from matrix heights and ventilation.25th Nov 1924Box 22 \ 1  Scan213
Vehicle cooling system efficiency, comparing fan and radiator performance.25th Nov 1924Box 22 \ 1  Scan214
Comparing the cooling performance of the Hispano and 40/50 HP engines at 20 M.P.H.25th Nov 1924Box 22 \ 1  Scan215
Comparing the merits of Hispano and 40/50 type radiator matrices.25th Nov 1924Box 22 \ 1  Scan216
With recommendations to reduce vehicle over-heating.25th Nov 1924Box 22 \ 1  Scan217
Table evaluating the performance of different radiator matrix heights and depths at a road speed of 30 m.p.h.25th Nov 1924Box 22 \ 1  Scan218


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