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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The difficulties in testing cooling systems and proposing new methods for radiator comparisons.25th Nov 1924Box 24 \ 5  Scan106
Report page detailing radiator cooling efficiency tests, referencing Newton's Law of Cooling and Method 'B'.25th Nov 1924Box 24 \ 5  Scan107
Continued description of a testing methodology for radiator efficiency and simulating hill climbing conditions on level ground.25th Nov 1924Box 24 \ 5  Scan108
Page detailing radiator water temperature differences and the critical atmospheric temperature for boiling.25th Nov 1924Box 24 \ 5  Scan109
Forwarding the minutes of a Sales Conference.5th Sep 1925Box 24 \ 5  Scan110
Sales conference minute discussing the water overheating issue in the 20 HP model.18th Nov 1925Box 24 \ 5  Scan111
Overheating complaint on a 40/50 HP Chassis 14-TM belonging to Juan Correa.18th Nov 1925Box 24 \ 5  Scan112
Radiator boiling issue on Chassis No. 63-AU, possibly caused by fitted shutters.30th Nov 1925Box 24 \ 5  Scan113
Criticizing the design and control method of radiator shutters and their effectiveness in preventing boiling.19th Nov 1925Box 24 \ 5  Scan114
Draft memorandum advising against fitting certain Bowden wire-operated radiator shutters to Silver Ghost cars.25th Nov 1925Box 24 \ 5  Scan115
Arrangement of water connections for Series V & P.W.10th Nov 1934Box 24 \ 5  Scan116
The design and performance of radiator shutters, comparing them to third-party options.1st Dec 1925Box 24 \ 5  Scan117
Overheating and cooling tests for chassis No. 14-TM.9th Dec 1925Box 24 \ 5  Scan118
Schemes for improving carburation by increasing the temperature of the throttle valve and carburetter.17th Dec 1925Box 24 \ 5  Scan119
Modification to a Phantom's cooling system to run under pressure.18th Jan 1926Box 24 \ 5  Scan120
Merits of a whistle versus a red lamp to warn of a boiling radiator.28th Apr 1926Box 24 \ 5  Scan121
Indicator to show when water is boiling using a thermometer from the Cambridge Instrument Co.1st Apr 1926Box 24 \ 5  Scan122
Responding to a query about increasing the cooling capacity on Phantom cars.2nd Jul 1926Box 24 \ 5  Scan123
Limitations of the water cooling system in Phantom models and considering alternative methods.24th Aug 1926Box 24 \ 5  Scan124
Typed memorandum discussing a steam-based cooling system with a safety valve.25th Aug 1926Box 24 \ 5  Scan125
Engine cooling on the Phantom, comparing it to the Silver Ghost and referencing experiments with different cooling systems.25th Aug 1926Box 24 \ 5  Scan126
Engine over-heating issues on Phantom models and a proposed solution involving a pressure system.26th Aug 1926Box 24 \ 5  Scan127
Trial of a lightened axle and hydraulic dampers on car 8-EX, and a request for sketches of the pressure cooling system from car 10-EX.26th Aug 1926Box 24 \ 5  Scan128
Overheating tests in France, comparing the fan and radiator positions on experimental cars 8-EX and 12-EX.21th Sep 1926Box 24 \ 5  Scan129
Correcting a previous reference from 8-EX to 12-EX concerning tests on over-heating in France.22th Sep 1926Box 24 \ 5  Scan130
CWB to Hs. discussing the superior cooling performance of the 12-EX model and potential modifications.30th Sep 1926Box 24 \ 5  Scan131
Comparing the 12-EX car's cooling system to the standard Phantom, concluding pressure cooling is an unnecessary complication.1st Oct 1926Box 24 \ 5  Scan132
Power curve graph comparing a steam cooling system and standard water cooling.10th Feb 1926Box 24 \ 5  Scan133
Cover sheet with handwritten reference numbers and a company stamp.27th Sep 1926Box 24 \ 5  Scan134
Modifications to radiator design and dimensions, including integral shutters and a comparison of front areas for various models.25th Jan 1927Box 24 \ 5  Scan135
Analysis of radiator cooling performance, comparing revisions of the EAC.8 radiator with different tube dimensions.17th Feb 1925Box 24 \ 5  Scan136
Fan position tests on the 12-EX to increase cooling efficiency and its potential application to Phantom models.25th Apr 1927Box 24 \ 5  Scan137
Use, necessity, and cost of bonnet shutters versus louvres on the 40/50 HP chassis.20th Jun 1927Box 24 \ 5  Scan138
Cost and simplification of 40/50 bonnet shutters and louvres.23th Jun 1927Box 24 \ 5  Scan139
Removal of rear shutters from a standard car model not intended for tropical climates.30th Jun 1927Box 24 \ 5  Scan140
Temperature tests at Brooklands comparing the effects of different car alterations on temperature and performance.12th Sep 1927Box 24 \ 5  Scan141
Technical comparison of the 10-EX and a standard car's cooling system, with conclusions on ventilation.12th Sep 1927Box 24 \ 5  Scan142
Summary of temperature tests conducted at Brooklands under various car conditions.19th Sep 1927Box 24 \ 5  Scan143
High-speed cooling tests comparing shutters to a louvered bonnet for a sports car.19th Sep 1927Box 24 \ 5  Scan144
Suitability and reliability of automatically controlled radiator shutters.24th Sep 1927Box 24 \ 5  Scan145
Technical bulletin discussing engine overheating caused by choking of the radiator core from hard water deposits.24th Jan 1928Box 24 \ 5  Scan146
Methods for testing radiator obstructions and cleaning the core with a chemical preparation.24th Jan 1928Box 24 \ 5  Scan147
Instructions for cleaning radiators with 'Kleenwell' and a recommendation to use soft water to prevent choking.24th Jan 1928Box 24 \ 5  Scan148
Graph illustrating water circulation flow rates in a complete water system against engine RPM.23th Jan 1928Box 24 \ 5  Scan149
The reverse of a document or photograph with a date stamp from the print room.23th Jan 1928Box 24 \ 5  Scan150
Blueprint detailing two methods for testing radiator efficiency and system restriction.23th Jan 1928Box 24 \ 5  Scan151
Blueprint detailing the design and dimensions of a Water Venturimeter.16th Jul 1928Box 24 \ 5  Scan152
Table and calculations showing the relationship between water's boiling point, pressure, and head.16th Jul 1928Box 24 \ 5  Scan153
Overheating issues of the 20 HP fan and potential improvements.17th Jul 1928Box 24 \ 5  Scan154
Depot sheet discussing procedures for addressing car over-heating by cleaning oxide deposits from cylinder blocks.9th Apr 1929Box 24 \ 5  Scan155
Obstructed radiators and boiling, including a specific case involving black slime and a note on anti-freeze solutions.1st May 1929Box 24 \ 5  Scan156
Cooling tests and proposed improvements for the 20 HP car.1st May 1929Box 24 \ 5  Scan157
Comparison of radiator specifications and performance expectations for various car models.27th May 1929Box 24 \ 5  Scan158
Loan of 'SS' Car 19-EX for opinions and addressing an overheating complaint.27th May 1929Box 24 \ 5  Scan159
Comparative analysis of the radiator cooling system on 'SS' cars versus Phantom models.27th May 1929Box 24 \ 5  Scan160
High-speed test report comparing bonnet ventilation and cooling performance to address vehicle overheating issues.12th Jun 1927Box 24 \ 5  Scan161
Comparison of car performance regarding overheating and the effectiveness of louvred bonnets.27th May 1929Box 24 \ 5  Scan162
Comparison of engine water temperatures during a hill climb test for three car models, with corresponding radiator specifications.27th May 1929Box 24 \ 5  Scan163
Largely blank document page stamped by the print room.29th May 1929Box 24 \ 5  Scan164
Letter discussing proposed performance tests in the mountains of France for chassis 21-EX.7th Jun 1929Box 24 \ 5  Scan165
Plans and rationale for testing the 21-EX car's cooling system against the Phantom.11th Jun 1929Box 24 \ 5  Scan166
Vehicle's performance during a road trip from Bourges to Grenoble, detailing speed and steering issues.24th Jun 1929Box 24 \ 5  Scan167
Road test report detailing water temperature, brake adjustments, and fuel consumption during a journey through France.24th Jun 1929Box 24 \ 5  Scan168
Letter regarding cooling tests for the 20 HP, 17-G type chassis, and potential modifications.25th Jun 1929Box 24 \ 5  Scan169
Vehicle modifications regarding shock damper lubrication, steering flow, and issues with fuel starvation at high speeds.25th Jun 1929Box 24 \ 5  Scan170
Report from Grenoble detailing a car test run on mountain roads, including a temperature test.25th Jun 1929Box 24 \ 5  Scan171
Vehicle performance metrics and observed mechanical faults during a road test.25th Jun 1929Box 24 \ 5  Scan172
Vehicle's performance during mountain ascents of the Col du Lauteret and Col du Galibier.26th Jun 1929Box 24 \ 5  Scan173
Test climb of the Galibier pass, detailing performance and a body boom issue.26th Jun 1929Box 24 \ 5  Scan174
Letter on Hotel Majestic Grenoble letterhead detailing a test drive of an Invicta car up the Col du Porte.27th Jun 1929Box 24 \ 5  Scan175
Engine boiling after a 2000ft climb, with observations on competitor vehicle testing.24th Jun 1929Box 24 \ 5  Scan176
Road test in the French Alps, detailing engine performance and cooling.28th Jun 1929Box 24 \ 5  Scan177
Road test report detailing vehicle cooling, tyre wear on mountain roads, and daily running statistics.28th Jun 1929Box 24 \ 5  Scan178
Instructions for experimental car testing regarding cooling, engine noise, body booming, and squeaking servos.1st Jun 1929Box 24 \ 5  Scan179
Servo squeaking and a proposal to test a Phantom front axle on an S.S. model to improve steering.1st Jun 1929Box 24 \ 5  Scan180
Cooling system issues and proposed improvements for SS cars.1st Jun 1929Box 24 \ 5  Scan181
Instructions for research work and testing on a vehicle, including fan position, axle, engine mountings, and steering.29th Jun 1929Box 24 \ 5  Scan182
Vehicle's performance during a mountain climb in France, written on hotel letterhead.29th Jun 1929Box 24 \ 5  Scan183
Brake improvements, mileage, and petrol consumption.29th Jun 1929Box 24 \ 5  Scan184
Results of 20 HP cooling tests in France, particularly for the 21-EX model.1st Jul 1929Box 24 \ 5  Scan185
Letter from Grenoble detailing a hill climb test to Le Revard to check the engine's water temperature.1st Sep 1929Box 24 \ 5  Scan186
Journey's itinerary, mileage, and petrol consumption.1st Jul 1929Box 24 \ 5  Scan187
Issues with choked radiators and recommending new S.S. radiator tubes and stricter production testing.24th Jul 1929Box 24 \ 5  Scan188
Investigation into complaints of radiators becoming choked in service on F.2 B series cars.26th Jul 1929Box 24 \ 5  Scan189
The hydraulic restriction and cooling efficiency of a gap radiator matrix.7th Aug 1929Box 24 \ 5  Scan190
Recommendation on radiator tube selection for the S.S. model based on comparative cooling capacity tests.7th Aug 1929Box 24 \ 5  Scan191
Radiator boiling issues on Phantom models, related to the spacing between radiator tubes.20th Aug 1929Box 24 \ 5  Scan192
Technical memorandum discussing facts about car cooling systems, radiator obstructions, and hydraulic restrictions.31th Aug 1929Box 24 \ 5  Scan193
Analysis of cooling system inefficiencies related to boiling, pump design, electrolytic corrosion, and radiator tube blockage.31th Aug 1929Box 24 \ 5  Scan194
Radiator outlet design and filter performance, including a diagram of a filter with a cleaning connection.21th Aug 1929Box 24 \ 5  Scan195
Graph showing the effect of temperature on circulation through an SS Radiator with 6/7 m/m tubes.21th Aug 1929Box 24 \ 5  Scan196
Test report comparing water flow restriction through various radiator types and configurations.13th Jun 1929Box 24 \ 5  Scan197
Dimensional drawing and table for radiator matrix and tubes for various models.13th Jun 1929Box 24 \ 5  Scan198
Blueprint diagram of a radiator test rig.23th Aug 1920Box 24 \ 5  Scan199
Choking issue in cooling systems by comparing the gap area and hydraulic mean depths of different series of tubes.24th Aug 1929Box 24 \ 5  Scan200
Radiator design, specifically concerning the top tank, tubes, flanges, and the potential addition of a filter.26th Aug 1929Box 24 \ 5  Scan201
Recommendations to prevent radiator blockages using distilled water and sodium phosphate.26th Aug 1929Box 24 \ 5  Scan202
Procedure for cleaning and repairing blocked radiators.26th Aug 1929Box 24 \ 5  Scan203
Proposal for a pamphlet detailing a new water system cleaning procedure using sodium phosphate.26th Aug 1929Box 24 \ 5  Scan204
Hydraulic resistance and choking issues in F2B, S.S., and V series radiators.30th Aug 1929Box 24 \ 5  Scan205


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