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).
Improvements for engine cooling on the 40/50 model, specifically regarding fans and bonnet design.
| Identifier | ExFiles\Box 38\2\ Scan274 | |
| Date | 31th December 1924 | |
| To HS.{Lord Ernest Hives - Chair} and EFC. c. to CJ. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} X3456 R2/M31.12.24. 40/50 WATER BOILING. X.766 X.3456 X.1017 EFC. has found a fan which promises to be better than our standard - i.e. with a bigger push at the air for less HP., therefore easier to drive, and belt drive more reliable. I should like this tested on the road against the standard fan to see if it gives any hope of lower temperature. I have a suspicion that our shuttered bonnets are not opened when needed and we get a bad name because they can be closed, whereas others like Hispano, with louvres which are always open, do not so suffer. Also a long line of louvres are better than shutters. We must not trust to shutting up our engine for silence. In 'V' series we have also advantages of less heat to the water per HP., and slightly larger front face, which we again increase at 'W' series. R.{Sir Henry Royce} | ||