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 system performance and overheating issues of the Phantom III in comparison to the Phantom II.
| Identifier | ExFiles\Box 155\1\ scan0228 | |
| Date | 10th June 1936 | |
| To E.{Mr Elliott - Chief Engineer} from Rm.{William Robotham - Chief Engineer} c. to Sg.{Arthur F. Sidgreaves - MD} c. to Wor.{Arthur Wormald - General Works Manager} c. to Hy.{Tom Haldenby - Plant Engineer} X1320 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}12/KW.10.6.36. Phantom III Cooling. We have been trying to establish a basic figure for the Ph.III Cooling. It is always possible at some time or other, if the conditions are sufficiently extreme, to make a car overheat. Our objective is to ensure that the average customer does not suffer any inconvenience. As far as we know there were never any complaints of overheating on Phantom II's turned out during the last 18 months they were in production. We therefore assume that this provides a basis of what is required. The Ph.III presents a more difficult problem because the frontal area is approximately the same and at any given road speed the power available is at least 20% greater than the Ph.II, the result being that approximately 20% more heat is ejected to the radiator and has to be dissipated. This is why we suffer from high under-bonnet temperatures on the Ph.III. The figures given in the attached report indicate that there is still room for improvement, but that the first production cars should be reasonably satisfactory in service. It may be necessary to provide a more efficient fan for customers who live in mountainous districts. Also, louvred bonnets will be essential for Continental work. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Att: Hs{Lord Ernest Hives - Chair}/Std.13/KW.10.6.36. Print Rm.{William Robotham - Chief Engineer}155. | ||