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).
Tests investigating methods to lower the Phantom III under-bonnet temperatures.
| Identifier | ExFiles\Box 94\3\ scan0116 | |
| Date | 8th December 1936 | |
| 360 R.{Sir Henry Royce} from Rm{William Robotham - Chief Engineer}/Std. c. to Sg.{Arthur F. Sidgreaves - MD} c. to Hs.{Lord Ernest Hives - Chair} c. to By.{R.W. Bailey - Chief Engineer} c. to Pa.{Mr Paterson} c. to Mx.{John H Maddocks - Chief Proving Officer} Rm{William Robotham - Chief Engineer}/Std/E.8.12.36. REPORT ON TESTS MADE TO INVESTIGATE THE POSSIBILITIES OF LOWERING P.III UNDER-BONNET TEMPERATURES. Reason for Tests:- The tests were made in order to determine whether it was practicable to reduce the P.III under-bonnet temperatures by:- (1) Controlling the water temperature by by-pass thermo- stat and arranging that the shutters should be partially or full open above a certain minimum water temperature (of the order of 50-60°C). (2) Deleting the engine side guards. Tests carried out. (a) As a result of some preliminary tests it was found very difficult to get readings of under-bonnet temp- eratures, etc. under road conditions which would check up and could be repeated. It was, therefore, desir- able to run comparative tests at as near as possible the same time and under similar conditions, and in order to do this and reduce the number of tests, etc., readings were only taken corresponding to two shutter conditions, i.e., connected to calorstat and full open. The under-bonnet temperatures were compared with:- (1) Shutters connected to calorstat as standard. (2) With shutters fixed at full open position. (3) Shutters fixed at full open position and side guards removed. The comparisons were made under:- | ||