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).
Performance comparison graph for various fan designs, plotting speed and power against axial thrust.
| Identifier | ExFiles\Box 75\3\ scan0028 | |
| Date | 27th February 1922 | |
| Fan tip dia. 1. Standard 40/50 six-bladed fan. 22" 2. Standard 40/50 six-bladed fan with three blades removed. 22" 3. EAC. four-bladed fan. 23" 4. Hispano fan. 17 1/2" 5. High speed 40/50 six-bladed fan. 22" 7. Goshawk fan. 18" 8. Fan made to recommendations of Prof. Watts. 22" 9. 2nd Fan made to recommendations of Prof. Watts, but with swept back blades. 22" 10. Expl. EAC. fan - first modification. 23" 11. Ditto, second modification. 23" 12. Ditto, third modification. 23" AXIS LABELS: Left Y-Axis: FAN SPEED Right Y-Axis: MOTOR OR ENGINE POWER REQUIRED TO DRIVE FAN (H.P.) X-Axis: AXIAL THRUST OF FAN IN LBS. WEIGHT GRAPH LABELS: SPEED POWER OTHER TEXT: Top Right: E.{Mr Elliott - Chief Engineer} Bottom Right: C.A.P. | ||