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 40/50 standard fan with three and six blades at various speeds.
| Identifier | WestWitteringFiles\L\July1924-September1924\ Scan32 | |
| Date | 18th 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 Values: 3000, 2800, 2600, 2400, 2200, 2000, 1800, 1600, 1400, 1200, 1000, 800, 600, 400, 200, 0 X-Axis Values: 0, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400 | ||