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).
Comparing the radiator and cooling systems of the 'Silver Ghost' and 'Hispano' cars.
| Identifier | ExFiles\Box 24\5\ Scan056 | |
| Date | 14th May 1925 | |
| EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LG14.5.25. to be in existance at the moment. We are therefore forced to use the same devices for dissipating superfluous cooling water heat as other cars. Now there is a limit to the depth of radiator which is of value, and most cars approach this limit, if therefore we wish to get rid of more heat units than other people, increase in face area of the radiator is the logical move. However, it will be apparent to anyone that a radiator of face area 33.9% greater than that of the Hispano would be quite impossible from every point of view. Actually the Hispano radiator face area is 584.2 sq.in. The Silver Ghost latest standard 510 sq.ins., the volumes of the cores being about the same, so that we have absolutely no more radiating surface to dissipate 33.9% more heat. The only remaining avenue of relief is to get more air through our radiator by increased bonnet ventilation and fan speed and size. The Hispano fit louvres in their bonnet, R.R. [struck through text] shutters which are seldom opened. The one point where we definitely gain is in the size and speed of the RR. fan. This alone stands between the 'Silver Ghost' and a debit balance of 33.9% more heat to be dissipated. A fan cannot possibly make up the deficit, but it can largely reduce the enormous discrepancy between the two cars. Unfortunately, the fan drive cannot be positive. On most cars this is not important as the fan does not play a contd :- | ||