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
Graph comparing the top water temperature of experimental setups 18 E.X. and 19 E.X. against miles run.25th Jun 1930Box 12 \ 7  07-page091
Blueprint detailing a modification to a front undershield to improve the cooling system.26th Jun 1930Box 12 \ 7  07-page092
Tests of completed cars, specifically concerning issues with the P.2 bonnet material being too soft and bending, with a suggested improvement for the stiffeners.26th Jun 1930Box 12 \ 7  07-page093
Scheme for a concealed bonnet side hinge for the P.2. and 25 HP models.28th Jun 1930Box 12 \ 7  07-page094
Extract from a report on tests of completed cars regarding the difficulty of producing louvered bonnets from a harder material.5th Jul 1930Box 12 \ 7  07-page095
Second report on Brooklands radiator tests, detailing fuel supply and autovac performance.9th Jul 1930Box 12 \ 7  07-page096
Vehicle performance issues related to high temperatures and fuel supply, specifically concerning the vacuum pump.9th Jul 1930Box 12 \ 7  07-page097
Cooling system fan belt performance and fuel mixture strength issues at high speeds.9th Jul 1930Box 12 \ 7  07-page098
Tests concerning pre-ignition, fuel supply, and radiator design improvements.19th Jul 1930Box 12 \ 7  07-page099
Engine cooling circulation tests, analyzing water temperature under various conditions and speeds.9th Jul 1930Box 12 \ 7  07-page100
Report discussing car overheating issues, cooling system performance, and the effects of various driving conditions.9th Jul 1930Box 12 \ 7  07-page101
Recommendations for improvements to the fan belt, autovac, bonnet shutters, and cooling system, with proposed tests for the Phantom models.9th Jul 1930Box 12 \ 7  07-page102
Graphs showing the results of cooling system tests, examining the effect of fan configuration, speed, and ventilation.2nd Jul 1930Box 12 \ 7  07-page103
Graphs illustrating the effect of water circulation on engine overheating under various conditions.2nd Jul 1930Box 12 \ 7  07-page104
Graph of top and bottom water temperatures plotted against seven different engine cooling configurations during a Brooklands test.2nd Jul 1930Box 12 \ 7  07-page105
Graph showing the effect of temperature on complete car circulation.1st Jul 1930Box 12 \ 7  07-page106
Cooling tests for 25 HP and 40/50 HP models, focusing on radiator tube size and design.1st Jul 1930Box 12 \ 7  07-page107
The upcoming test of a square tube radiator and track comparisons with other cars.1st Jul 1930Box 12 \ 7  07-page108
Optimal size of radiator tubes for engine cooling and related effects on the carburetter.14th Jul 1930Box 12 \ 7  07-page109
Extract discussing issues with P.2 bonnets, including scuttle gap uniformity and louvred panel construction.15th Jul 1930Box 12 \ 7  07-page110
Requesting clarification on the type of bonnet ventilation fitted to car 24-EX in France.16th Jul 1930Box 12 \ 7  07-page111
Number of shutter ventilators on a car bonnet and the naming convention.18th Jul 1930Box 12 \ 7  07-page112
The approval and standardisation of an altered bonnet and dashboard for the Phantom II car.18th Jul 1930Box 12 \ 7  07-page113
Design of a 2nd L.H. P.2 model for the American market, focusing on the bonnet, instrument board, and front apron.21th Jul 1930Box 12 \ 7  07-page114
Alteration to the bonnet and dash for the 'N2' series chassis.22th Jul 1930Box 12 \ 7  07-page115
Approval and standardisation of components for the Second L.H. P.2 model for America.22th Jul 1930Box 12 \ 7  07-page116
Expediting an approved alteration to a bonnet and dash, which is for appearance rather than technical reasons.23th Jul 1930Box 12 \ 7  07-page117
Impracticality of bonnet shutters and suggesting an improved, more easily operated design.30th Jul 1930Box 12 \ 7  07-page118
Query regarding omitting side bonnet ventilators on a Left Hand Phantom Two.21th Aug 1930Box 12 \ 7  07-page119
Update on investigations concerning shutters in bonnets.25th Aug 1930Box 12 \ 7  07-page120
From C. to Hs. requesting an update on a matter following a cable from Oy.23th Aug 1930Box 12 \ 7  07-page121
Number and placement of shutters on Phantom bonnets for cooling.29th Aug 1930Box 12 \ 7  07-page122
Methods to mitigate radiator water loss on the Phantom II model.31th Aug 1930Box 12 \ 7  07-page123
Report discussing the design of square tube radiators and improvements to bonnet ventilation.31th Aug 1930Box 12 \ 7  07-page124
Poor quality of the current bonnet lock and vertical louvres, requesting new parts.31th Aug 1930Box 12 \ 7  07-page125
Brief typed acknowledgement regarding Phantom Bonnets.1st Sep 1930Box 12 \ 7  07-page126
Overheating issues with the Phantom II model and the efficiency of its bonnet cooling ventilators.1st Sep 1930Box 12 \ 7  07-page127
Technical explanation of the cooling system design and the reasons for potential overheating in a Phantom II.1st Sep 1930Box 12 \ 7  07-page128
Instructions regarding the instrument board warning lamp, cooling system boiling, and bonnet ventilation for hot climates.2nd Sep 1930Box 12 \ 7  07-page129
Instructions on the engine's red warning lamp behavior and running with the cut-out open on Continental roads.2nd Sep 1930Box 12 \ 7  07-page130
Retention of front and rear shutters for the Phantom II cooling system to address petrol heat issues.3rd Sep 1930Box 12 \ 7  07-page131
Deletion and painting process of bonnet shutters.9th Jul 1927Box 12 \ 7  07-page132
Confirming decisions on the design of 40/50 HP bonnets, specifically regarding shutters and louvres.22th Jul 1927Box 12 \ 7  07-page133
Effects of removing rear shutters on engine cooling efficiency.30th Jun 1927Box 12 \ 7  07-page134
Standardisation of chassis parts for an improved type of bonnet lock to overcome customer complaints.17th Dec 1929Box 12 \ 7  07-page135
Proposed and recent modifications to the vehicle's cooling system, including shutters, overflow valves, radiators and louvres.1st Oct 1930Box 12 \ 7  07-page136
Instruction memo to stop the 25HP flywheel and clutch job and modify the bonnet louvres.11th Oct 1930Box 12 \ 7  07-page137
New louvred bonnet design, scheme 3153, with horizontal louvres.11th Oct 1930Box 12 \ 7  07-page138
Request for a progress update on three experiments concerning pedal stems and bonnet designs.11th Oct 1930Box 12 \ 7  07-page139
Status update on experiments concerning adjustable pedal stems, concealed bonnet hinges, and Phantom II bonnet modifications.13th Oct 1930Box 12 \ 7  07-page140
Design improvements for radiators, bonnets, overflow valves, and bonnet vents.14th Oct 1930Box 12 \ 7  07-page141
Proposed modification to the bonnet to improve the body line for a continuous look.16th Oct 1930Box 12 \ 7  07-page142
Criticisms and potential improvements for bonnets and radiators.25th Oct 1930Box 12 \ 7  07-page143
Design suggestions for a filler cap, horizontal louvres, and bonnet sides.25th Oct 1930Box 12 \ 7  07-page144
Radiator tubes, bonnet vents and shutter design styles.27th Oct 1930Box 12 \ 7  07-page145
Modifying bonnet fasteners for the Phantom II model to prevent lifting on bad roads.27th Oct 1930Box 12 \ 7  07-page146
Design and performance of radiators and bonnets, comparing square tubes to round tubes.30th Oct 1930Box 12 \ 7  07-page147
Instructing a new, stronger spring for the 40/50 HP chassis bonnet catch.5th Dec 1930Box 12 \ 7  07-page148
The preparation of two different bonnet types, one welded steel and one riveted aluminium, for the 25-EX car.10th Jan 1931Box 12 \ 7  07-page149
Inquiring about the status of updating to modern bonnet ventilators.4th Feb 1931Box 12 \ 7  07-page150
Implementation of a 100% stronger spring for the Phantom bonnet catches to eliminate rattles.4th Feb 1931Box 12 \ 7  07-page151
The development of new bonnet ventilators for the Phantom II model.5th Feb 1931Box 12 \ 7  07-page152
Chasing the progress on designs for the 40/50 - Phantom II model's Bonnet Ventilation.10th Feb 1931Box 12 \ 7  07-page153
Accompanying a rough sketch of a bridge piece for a car bonnet to prevent damage.11th Feb 1931Box 12 \ 7  07-page154
Standardisation of chassis parts including a shallow tank radiator, wider dashboard and overlapping bonnet.24th Jul 1930Box 12 \ 7  07-page155
Standardisation of chassis parts to revert to four ventilating panels in the bonnet to reduce overheating.10th Jul 1930Box 12 \ 7  07-page156
Design assumptions, material specifications, and construction methods for new car bonnets.19th Feb 1931Box 12 \ 7  07-page157
Prints and originals for bonnet ventilators.3rd Mar 1931Box 12 \ 7  07-page158
Requesting a set of new ventilated bonnet shutters for cooling tests on car 19-EX at Brooklands.13th Apr 1931Box 12 \ 7  07-page159
Standardisation of a revised bonnet with concealed hinges overhanging the dash.13th Jan 1931Box 12 \ 7  07-page160
Form detailing particulars for a chassis alteration, including the first chassis number and associated costs.27th Apr 1931Box 12 \ 7  07-page161
Fitting stronger springs (E.61914) to the bonnet clips on Phantom II models.28th May 1931Box 12 \ 7  07-page162
Tests carried out to ascertain and eliminate bonnet movement and knocks by testing different radiator and engine mountings.18th Jun 1931Box 12 \ 7  07-page163
Diagram showing bonnet movement measurements in thousandths of an inch under chassis twist conditions.11th Jun 1931Box 12 \ 7  07-page164
Bonnet panel clearance on 40/50 & 25 HP models to prevent knocking from frame twisting.11th Jun 1931Box 12 \ 7  07-page165
Design and manufacturing of rivetless bonnets, comparing steel and aluminium options.18th Jun 1931Box 12 \ 7  07-page166
The design and material considerations for aluminium bonnets, including hinges and rivets.18th Jun 1931Box 12 \ 7  07-page167
The standardisation and modification of P.2 bonnets.20th Jun 1931Box 12 \ 7  07-page168
Design and construction of a rivetless aluminium bonnet for the 20/25 model.1st Jun 1931Box 12 \ 7  07-page169
The supply of drop-sided bonnets in relation to spare wheel placement on various chassis models.24th Jun 1931Box 12 \ 7  07-page170
Design, operation, and construction of flip-flap bonnet shutters for the P.2 model.26th Jun 1931Box 12 \ 7  07-page171
Bonnet riveting and material choice, specifically steel flaps in aluminium panels and rust prevention.26th Jun 1931Box 12 \ 7  07-page172
Criticisms and required modifications for flip-flop type bonnet ventilators.26th Jun 1931Box 12 \ 7  07-page173
Bonnet rattle and temperature tests, with notes on steering and petrol boiling issues.29th Jun 1931Box 12 \ 7  07-page174
Design and material choice for a rivetless bonnet, comparing a proposed design with one from Armstrong-Siddeley.4th Jul 1931Box 12 \ 7  07-page175
Alteration to the Phantom II bonnet side plates to avoid a gap with the chassis.6th Jul 1931Box 12 \ 7  07-page176
Design and material choice for car bonnets, comparing aluminium and steel options.7th Aug 1931Box 12 \ 7  07-page177
Design proposal for a steel bonnet without rivets, showing sections of the top and side hinges.8th Jul 1931Box 12 \ 7  07-page178
Technical report on the investigation and resolution of bonnet knocking issues on the 25-EX model.8th Jul 1931Box 12 \ 7  07-page179
Agreeing to a bonnet design and clarifying modifications for the coachbuilder.13th Jul 1931Box 12 \ 7  07-page180
Standardisation sheet discussing the alteration to the pivot point of flip flap type bonnet ventilators.14th Jul 1931Box 12 \ 7  07-page181
Alternative designs for rivetless bonnets, comparing aluminium against steel.15th Jul 1931Box 12 \ 7  07-page182
Design and production of rivet-less aluminium car bonnets and associated issues with louvres.20th Aug 1931Box 12 \ 7  07-page183
Achieving the interchangeability of bonnets for L.H. and N.2 series R.H. cars.1st Sep 1931Box 12 \ 7  07-page184
Phantom II cooling tests, covering radiator air temperature rise and bonnet ventilation.17th Sep 1931Box 12 \ 7  07-page185
Graph showing the rise of air temperature through a radiator matrix versus road speed at two different engine water temperatures.16th Sep 1931Box 12 \ 7  07-page186
Set of graphs comparing air pressure under a plain bonnet versus a louvered bonnet at different road speeds and gears.16th Sep 1931Box 12 \ 7  07-page187
P.2 Cooling tests comparing air pressure under bonnets fitted with flip-flap shutters versus a louvred bonnet.19th Sep 1931Box 12 \ 7  07-page188
Graphs showing air pressure under the bonnet versus road speed for a Chassis 20 EX under various conditions.18th Sep 1931Box 12 \ 7  07-page189
Bonnet fitting issues related to packings and recommending their removal from future production.30th Sep 1931Box 12 \ 7  07-page190


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