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 plotting Fan Speed and Power Required against the Axial Thrust for a standard (3A) and an experimental (10A) fan type.
| Identifier | ExFiles\Box 75\3\ scan0060 | |
| Date | 19th March 1925 guessed | |
| 3A. STD. TYPE EAC. 10A. EXPL. TYPE EAC. FAN SPEED (R.P.M.) MOTOR OR ENGINE POWER REQUIRED TO DRIVE FAN (H.P.) SPEED POWER AXIAL THRUST OF FAN IN LBS WEIGHT C.A.P. 3A 10A 1175 1445 | ||