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).
Daily report detailing overheating tests carried out on a Standard Phantom III at Brooklands.
| Identifier | ExFiles\Box 155\1\ scan0283 | |
| Date | 3rd June 1937 | |
| To Rm{William Robotham - Chief Engineer} 1320 3. 6. 37. @ttached Daily Report on Overheating. Tests carried out 2. 6. 37. As proposed in our report of 1. 6. 37. we have proceeded to carry out tests at Brooklands - the air temperature still only being of the order of 18-20°C. In any case I do not think that much useful information can be gained by further running in traffic, and our tests to date have shown that overheating which occurs with a Standard Phantom lll. is confined to stationary idling conditions and the seriousness of it is a function of the number and duration of traffic blocks encountered. Since it is difficult to get any comparative figures under such variable conditions as are experienced in traffic we are testing under stationary idling conditions and full speed conditions at Brooklands. We are unable to carry out tests in any number under full throttle 30 M.P.H. or 40 M.P.H. conditions, since 22-G-5 engine and brakes are not really equal to holding a Phantom lll. down to these speeds. The results of the test carried out so far indicate the following conclusions (subject to any check test we may make) HS{Lord Ernest Hives - Chair} 1. With an air temperature of approximately 20°C. a Standard Phantom lll as represented by 37-EX will reach 100°C. in the radiator top tank if idled dead slow for 15-20 minutes. At this temperature no water loss takes place and none is lost until the temperature reaches 105°C. (provided steam valve is set correctly) even then the water loss is very slight. 2. A definite improvement can be made, both idling and at high speeds, by opening the bonnet shutters under idling conditions this increases time to reach 100°C. by 8-10 minutes and lowers maximum temperature obtained by approximately 2°C. 3. The fan ring which we have tried is unsuccesful and shows no gain either idling or at high speeds | ||