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).
Letter to Harrison Radiator Corporation regarding the cooling systems of the Phantom III and Bentley cars, enclosing technical data.
| Identifier | ExFiles\Box 149a\3\ scan0168 | |
| Date | 16th June 1936 | |
| X1278 Exptl. Dept. Hs{Lord Ernest Hives - Chair}/Std.17/KW. 16th June, 1936. L.P. Saunders Esq., The Harrison Radiator Corporation, Lockport, New York, U.S.A. Dear Mr. Saunders, We thank you for your letter of March 25th addressed to our Mr. B.I. Day, which has been passed on to us for reply as we have all the necessary data easily available. Dealing first with the question of the cooling of the Phantom III car, in view of the fact that you think we should be able to cool the car adequately with the size of radiator etc. which we have (corresponding as you say to .5 lbs per H.P.), we are enclosing drawings showing dimensions of the radiator, bonnet, fan, matrix, etc., together with power curves, heat flow and water flow curves of the Phantom III and Bentley engines. We also attach figures showing relative cooling of the Phantom III and Bentley car, our method of determining "critical air temperatures" under given conditions being to run the car at the given load and speed (controlling speed by means of a towed car if necessary) at Brooklands track, and take readings of the water temperature in the top tank at intervals around the circuit until the temperature is steady, noting the air temperature at each reading. The mean of the readings is taken and the critical air temperature obtained thus. | ||