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
Steering tests conducted on a 40/50 car with front disc wheels and vertical pivots.1st Apr 1924West Wittering \ L \ 2April1924-June1924  Scan102
Steering shock tests when driving over various obstacles.1st Apr 1924West Wittering \ L \ 2April1924-June1924  Scan103
Steering performance and low-speed wobbles on a simulated bad road.4th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan104
Tests on an agreed type servo using 35, 45, and 55 degree angle threads.12th Jul 1923West Wittering \ L \ 2April1924-June1924  Scan105
W.W. slow speed servo motor with 550 thread, detailing torque ratios and bearing loads.1st Apr 1924West Wittering \ L \ 2April1924-June1924  Scan106
Graph showing the friction effect in a W.W. slow speed servo, plotting torque output against torque input.5th Apr 1934West Wittering \ L \ 2April1924-June1924  Scan107
Make ratio-speed curves for a 20 HP ignition contact breaker.5th Apr 1934West Wittering \ L \ 2April1924-June1924  Scan108
Graph of make ratio versus distributor speed for a standard distributor at various primary gap settings.4th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan109
Comparing three exhaust systems on a standard 40/50 HP engine.5th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan110
Table comparing power output and loss in B.HP for various exhaust systems at different engine speeds.12th Jul 1928West Wittering \ L \ 2April1924-June1924  Scan111
Indicator work performed on different engine exhaust systems.12th Jul 1928West Wittering \ L \ 2April1924-June1924  Scan112
Graph of piston displacement for crank angle showing indicated volumetric efficiency for a 40/50 engine.4th Apr 1928West Wittering \ L \ 2April1924-June1924  Scan113
Graph of exhaust system pressure against crank angle for a 40-50 engine at 2000 RPM.4th Apr 1928West Wittering \ L \ 2April1924-June1924  Scan114
Graph showing pressure curves and piston displacement against crank angle for a 40-50 engine.4th Apr 1928West Wittering \ L \ 2April1924-June1924  Scan115
Graph showing piston displacement for crank angles related to a 40-50 engine exhaust scheme.4th Apr 1928West Wittering \ L \ 2April1924-June1924  Scan116
Graph plotting piston displacement and pressure against crank angles for a 40/50 engine's exhaust stroke.4th Apr 1928West Wittering \ L \ 2April1924-June1924  Scan117
Graph plotting piston displacement against crank angle for a 40/50 HP engine's Derby exhaust scheme.1st Apr 1924West Wittering \ L \ 2April1924-June1924  Scan118
List of weights for various units on a Hispano-Suiza engine.1st Apr 1924West Wittering \ L \ 2April1924-June1924  Scan119
Detailed weight breakdown of various engine components, continued from a previous page.9th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan120
Comparing leverages and pressure on different servo schemes.9th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan121
The necessity to design new parts to apply front wheel brakes to the short type chassis.11th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan122
Friction and other losses in the Mk. Hall-Scott servo.4th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan123
Technical note on torque loss and plate pressure in different servo designs.12th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan124
Test results for friction losses on a F.W. slow speed servo motor, with tables for torque and coefficient of friction.12th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan125
Test results and diagrams comparing the performance of standard and improved slow speed servo types.17th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan126
The performance test results for a Hispano servo motor after restoration.20th Mar 1924West Wittering \ L \ 2April1924-June1924  Scan127
Overheating issues in 40/50 HP cars fitted with four-wheel brakes.27th Apr 1925West Wittering \ L \ 2April1924-June1924  Scan128
Overheating on the 40/50s model, weighing the pros and cons of exhaust versus water-heated throttles.28th Apr 1925West Wittering \ L \ 2April1924-June1924  Scan130
Overheating issues in 40/50 cars, focusing on exhaust systems and 4-wheel brakes.28th Apr 1925West Wittering \ L \ 2April1924-June1924  Scan132
Page discussing vehicle overheating issues, particularly in Australia, and comparing braking systems.28th Apr 1925West Wittering \ L \ 2April1924-June1924  Scan133
Over-heating investigations related to the choke valve in the exhaust.1st May 1925West Wittering \ L \ 2April1924-June1924  Scan135
Tests on the heat flow to the cooling water with varying exhaust back pressure on an 'EAC' engine.29th Apr 1925West Wittering \ L \ 2April1924-June1924  Scan136
Engine performance tests related to heat flow and back pressure.1st Apr 1925West Wittering \ L \ 2April1924-June1924  Scan137
The relationship between throttle, back pressure, power, and heat flow.25th Sep 1924West Wittering \ L \ 2April1924-June1924  Scan138
Tests conducted on an exhaust down-pipe baffle to determine its effect on an over-heating problem.25th Sep 1924West Wittering \ L \ 2April1924-June1924  Scan139
Page 2, detailing tests on the effect of a restricted exhaust baffle on engine power and water temperature.1st Apr 1925West Wittering \ L \ 2April1924-June1924  Scan140
Specifications for a standard tall stabalite encased battery ignition coil.29th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan142
Specifications and performance details for a contact breaker and secondary coil for a 20 HP chassis.1st Apr 1924West Wittering \ L \ 2April1924-June1924  Scan143
Analysis of electrical current consumption in an ignition system, comparing observed and calculated values.29th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan144
Ignition system energy consumption and performance testing of 'Eska' tungsten points.29th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan145
The performance of points, noting they are satisfactory compared to previous makes that showed burning or pitting.29th Apr 1924West Wittering \ L \ 2April1924-June1924  Scan146
Graph of current consumption curves for a standard tall coil at 8 and 12 volts, plotting current against distributor speed.29th Apr 1934West Wittering \ L \ 2April1924-June1924  Scan147
Graph showing the Gap-Make Ratio Curve for a standard Goshawk distributor at a constant speed of 700 R.P.M.14th Oct 1934West Wittering \ L \ 2April1924-June1924  Scan148
Customer complaints about removing the 20 HP undershield and proposing a modification to simplify the process.4th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan0
The pressure distribution for a 40/50 front wheel brake system, comparing standard and modified arrangements.12th Jul 1923West Wittering \ L \ 2Jan1924-March1924  Scan1
Hispano four-wheel brakes, calculating pressures for reverse braking.12th Jul 1923West Wittering \ L \ 2Jan1924-March1924  Scan2
Use of non-inductive resistances in a starter's magnetic main switch circuit.12th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan3
Continued memorandum discussing electrical safety and the rearrangement of windings.12th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan4
Cover letter for a report on a visit to Ferodo's Works regarding potential variations in their brake material.17th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan5
The wrapping and non-wrapping action of rigid brake shoes.17th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan6
The mechanics and torque equations for wrapping and non-wrapping brake shoes.1st Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan7
Continued page discussing the co-efficient of friction and servo pressure for front brakes.13th Mar 1924West Wittering \ L \ 2Jan1924-March1924  Scan8
The effects of unequal braking on steering.1st Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan9
Tests conducted on a servo brake, including material and lining analysis.22th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan10
Series of tests on an E.A.C. servo on a brake testing rig.22th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan11
The effects of speed and heat on brake lining wear and friction.12th Jul 1928West Wittering \ L \ 2Jan1924-March1924  Scan12
Comparing the horsepower absorbed by the 40/50 rear wheel foot brake shoes with the servo.12th Jul 1923West Wittering \ L \ 2Jan1924-March1924  Scan13
Study on the effect of high temperatures on servo wear and mechanical gain factor.2nd Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan14
Issues with the flywheel inspection cover and lack of a drain hole on the R.A.C-1 engine.22th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan15
Sending two sets of servo brake liners from test cars for examination of wear differences.1st Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan16
Performance and wear analysis of E.A.C. Servo with cast iron and Ferodo liners.24th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan17
Cover memo for a photostat copy of an Isotta Fraschini crankshaft.28th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan18
Blueprint detailing the design and dimensions of a V8 engine crankshaft.28th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan19
1100 miles of road and brake tests on a Hispano car.1st Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan20
Condition of brake drum steel liners and a proposal to test Hispano brakes on a test rig.1st Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan21
Drawing of a Hispano front brake drum made from aluminium with a steel liner.1st Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan22
The performance and modifications for dipping headlights on the 20 HP model.1st Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan23
The method for determining the tractive resistance of a touring car at 50 M.P.H. and over.12th Jul 1923West Wittering \ L \ 2Jan1924-March1924  Scan24
Tractive resistance and horsepower calculations for a touring car.12th Jul 1923West Wittering \ L \ 2Jan1924-March1924  Scan25
Comparing the weight and specifications of Hispano front brakes against E.A.C. and 40/50 HP models.1st Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan26
Drawing of a Hispano brake carrier.1st Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan27
Technical drawing showing the design and dimensions of a Hispano front shoe.1st Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan28
Sectional drawing of an Aluminium Hispano Brake Carrier.12th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan29
EAC engine weights, comparing a cast iron induction pipe with an aluminium version.11th Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan30
Comparing the weight of an induction pipe and hot spot when made in cast iron versus aluminium.11th Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan31
Specifications and suitability of a Goshawk dynamo for a chassis.11th Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan32
Comparison of the moment of inertia for the E.A.C. and Goshawk clutch plates.2nd Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan33
Ongoing tests on brake friction, referencing an attached chart from Ferodo.2nd Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan34
Graph comparing the coefficient of friction versus slipping speed for two Ferodo brake lining materials.1st Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan35
Investigations into brakes.1st Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan36
Introducing the weights of the 20 HP engine unit, weighed in sections.2nd Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan37
Table listing the weights of various engine components in lbs and per 100 cubic inches displacement.2nd Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan38
Table detailing the weights of various oil system components, with a final calculation for total weight without the gearbox.12th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan39
Table comparing the weights of various engine components per 100 cubic inches of displacement.12th Jul 1923West Wittering \ L \ 2Jan1924-March1924  Scan40
Tests to reduce heat from exhaust boxes by lagging them with asbestos and planished steel.12th Jul 1923West Wittering \ L \ 2Jan1924-March1924  Scan41
Clutch dragging issues when gearbox oil is hot and thin.1st Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan42
Tests and observations on a Goshawk battery ignition distributor and contact breaker.25th Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan43
Instruction sheet for a bench test of Goshawk ignition parts.31th Jan 1924West Wittering \ L \ 2Jan1924-March1924  Scan44
The performance of tungsten points after a 5,750 mile test, noting sparking issues and physical wear.29th Jun 1929West Wittering \ L \ 2Jan1924-March1924  Scan45
Inspection notes on wear for a rubbing block, rotor blade, and condenser spring.29th Jun 1920West Wittering \ L \ 2Jan1924-March1924  Scan46
Inspection report detailing the wear on Tungsten Points AQ and AR after 5,430 miles.20th Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan47
Inspection report detailing the wear and condition of screw and lever ignition points.29th Jun 1920West Wittering \ L \ 2Jan1924-March1924  Scan48
Analysis of point wear, suggesting larger points and investigating oxide formation due to high current density.29th Jun 1920West Wittering \ L \ 2Jan1924-March1924  Scan49
Instructions on preventing pit formation at electrical contact points due to sparking.29th Jun 1920West Wittering \ L \ 2Jan1924-March1924  Scan50
Test house report on the performance and maintenance of tungsten contact points.22th Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan51
Instruction sheet detailing the measurement and wear of standard Bakelite contact breaker rubbing blocks.22th Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan52
Instruction sheet detailing measurements of wear on car parts after running a certain number of miles.29th Jun 1920West Wittering \ L \ 2Jan1924-March1924  Scan53
The performance and silence of a 20 HP gearbox with right-hand brake and change speed levers.29th Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan54
Investigation into the noisiness of Goshawk dynamos, particularly those with two coils per slot and 57 commutator segments.29th Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan55
Modifications to dynamo pole pieces intended to reduce noise.29th Feb 1924West Wittering \ L \ 2Jan1924-March1924  Scan56
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