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 air velocity against fan speed for a 40/50 standard fan, comparing six-bladed and three-bladed versions.
| Identifier | ExFiles\Box 75\3\ scan0137 | |
| Date | 24th September 1924 guessed | |
| VELOCITY OF AIR STREAM OF 40/50 STANDARD FAN AT VARIOUS SPEEDS AIR VELOCITY (FT/MIN) FAN SPEED (RPM) SIX BLADED FAN THREE BLADED FAN Y-AXIS: 0, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000 X-AXIS: 0, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400 | ||