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 air stream velocity of a three-bladed vs. a six-bladed 40/50 standard fan at various speeds.
| Identifier | ExFiles\Box 75\3\ scan0007 | |
| Date | 18th September 1924 guessed | |
| VELOCITY OF AIR STREAM OF 40/50 STANDARD FAN AT VARIOUS SPEEDS AIR VELOCITY (FT/MIN) Y-AXIS SCALE: 0, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000 FAN SPEED (RPM) X-AXIS SCALE: 0, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400 SIX BLADED FAN THREE BLADED FAN | ||