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).
Graph comparing the speed, power required, and axial thrust for twelve different engine cooling fan designs.
| Identifier | ExFiles\Box 75\3\ scan0156 | |
| Date | 18th December 1924 guessed | |
| Fan tip dia. 1. Standard 40/50 six-bladed fan. 22" 2. Standard 40/50 six-bladed fan with three blades removed. 22" 3. EAC. four-bladed fan. 23" 4. Hispano fan. 17½" 5. High speed 40/50 six-bladed fan. 22" 7. Goshawk fan. 18" 8. Fan made to recommendations of Prof. Watts. 22" 9. 2nd Fan made to recommendations of Prof. Watts, but with swept back blades. 22" 10. Expl. EAC. fan- first modification. 23" 11. Ditto, second modification. 12. Ditto, third modification. 23" SPEED POWER FAN SPEED MOTOR OR ENGINE POWER REQUIRED TO DRIVE FAN (H.P.) AXIAL THRUST OF FAN IN LBS. WEIGHT E.{Mr Elliott - Chief Engineer} C.M.P 27.C. 18/1/ | ||