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, and axial thrust for various standard and experimental fan designs.
| Identifier | ExFiles\Box 75\3\ scan0068 | |
| Date | 18th March 1925 | |
| NOS. & DESCRIPTIONS OF FANS Fan tip diameter. (1) Std. 40/50 6-bladed fan. 22" (3) Original RAC. 4-bladed fan. 23" (9) Better of the two fans made as far as possible to recommendations by Prof. Watts. 22" (10) Expl. RAC. fan. 1st Modification as previously reported (See E701/17.12.24). 23" (14) Last expt. on (10) previous to reduction of fan tip dia. 23" (15) (Points only, marked ◎). Fan of reduced tip dia. made up to tentatively best shape and handed to D.O. for instr. for RAC. production. 22" (16) (Points only - marked □). Wider bladed expl. fan, 1st. modification. 22" (17) (Points only - marked △). Wider bladed expl. fan, 2nd. modification. 22" (18) (Full curve). Wider bladed expl. fan. 3rd Modn., this being considered to be the finally best form of fan produceable of this dia. from sheet material. 22" FAN SPEED (RPM) MOTOR OR ENGINE POWER REQUIRED TO DRIVE FAN (HP) AXIAL THRUST OF FAN IN LBS WEIGHT SPEED POWER H ● 10A x 3A H.E.W. 18-3-25 E.7.C. 1932 | ||