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 thrust and power consumption against fan speed for various fan designs.
| Identifier | ExFiles\Box 75\3\ scan0069 | |
| Date | 19th March 1925 | |
| MOTOR OR ENGINE POWER REQUIRED TO DRIVE FAN (HP) AXIAL THRUST OF FAN IN LBS WEIGHT FAN SPEED (RPM) THRUST POWER NOE. & DESCRIPTIONS OF FANS. Fan tip diameter. (1) Std. 40/50 6-bladed fan. 22" (3) Original EAC. 4-bladed fan. 23" (9) Better of the two fans made as far as possible to recommendations by Prof. Watts. 22" (10) Expl. EAC. fan. 1st Modification as previously reported (See EFCl/T17.12.24). 23" (14) Last expl. 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 EAC. production. 22" (16) (Points only - marked □). Wider bladed expl. fan. 1st. modification. 22" (17) (Points only - marked Δ). Wider bladed expl. fan. 2nd. modification. 22" (18) (Full curve). Wider bladed expl. fan. 3rd Modfn. this being considered to be the finally best form of fan producible of this dia. from sheet material. 22" Data Points on Graph: 1, 3, 9, 10, 14, 15, 16, 17, 18, 10A, 3A I | ||