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 showing power absorbed by a 40/50 standard fan at various speeds, comparing three and six-bladed fans.
| Identifier | ExFiles\Box 75\3\ scan0136 | |
| Date | 18th September 1924 | |
| POWER ABSORBED BY 40/50 STANDARD FAN AT VARIOUS SPEEDS APPROX LAW FOR SIX BLADED FAN. H = .01910 S^2.808 x 10^-6 APPROX LAW FOR THREE BLADED FAN H = .02562 S^2.692 x 10^-6 WHERE H = POWER DELIVERED BY MOTOR S = MOTOR SPEED Y-AXIS: H.P. DELIVERED X-AXIS (Top): MOTOR SPEED (R.P.M.) X-AXIS (Bottom): EQUIVALENT CHASSIS ENGINE SPEED. Graph Lines: SIX BLADED FAN, THREE BLADED FAN Handwritten Text: C.A.P. E.7.C. 18/9/24 Stamp Text: ROLLS-ROYCE PRINT ROOM 28 SEP. | ||