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).
Cooling tests carried out on 'Wraith' cars at Brooklands and Derby.
| Identifier | ExFiles\Box 131\5\ scan0028 | |
| Date | 24th November 1937 | |
| To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Std. c. to Hs.{Lord Ernest Hives - Chair} c. to RHC.{R. H. Coverley - Production Engineer} c. to Da.{Bernard Day - Chassis Design} c. to Mx.{John H Maddocks - Chief Proving Officer} REPORT ON COOLING TESTS CARRIED OUT ON "WRAITH CARS (26.G.VI. AT BROOKLANDS AND 26.G.VI. AT DERBY) In order to check up on the effectiveness of the cooling system on the Wraith car, a number of tests have been carried out at various speeds, at Brooklands and on the road and under stationary idling conditions. These tests have been averaged, summarised and divided into the following groups - (1) Effect of fan type, position and speed. (2) " " water flow. (3) " " undershields. (4) " " bonnet shutters. (5) General cooling system suitability under various conditions. RESULTS FROM TESTS. Sheet (1) shows results of first group. " (2) " " " groups (2) (3) and (4). " (3) " " " group (5). When carrying out idling tests, two methods of procedure have been employed (1) at Brooklands the tests were taken immediately after a continued high speed run, so that the whole of the engine, oil and water were thoroughly hot - this represents the worst possible set of conditions. (2) at the Works, the tests were taken after approximately 10 - 15 miles fast driving on the road - the oil temperature and general engine temperature were lower than on the track and these conditions are not so severe. It will be noted that on sheet (3) one result was obtained on a road test - this was done in order to endeavour to obtain a suitable alternative venue for cooling suitability tests which would be reasonably near Derby. It will also be noted that tests were taken at 5.MPH. full throttle 1st. gear, 15.MPH. full throttle 3rd. gear, 20 MPH. full throttle top gear and 60 MPH. full throttle top gear. These were done in addition to our standard tests of continued | ||