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 of the power absorbed by a 40/50 standard fan at various speeds, comparing six and three-bladed versions.
| Identifier | WestWitteringFiles\L\July1924-September1924\ Scan33 | |
| 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 H.P. DELIVERED SIX BLADED FAN THREE BLADED FAN MOTOR SPEED (R.P.M.) EQUIVALENT CHASSIS ENGINE SPEED ROLLS-ROYCE, LTD POINT ROAD 26 C.H.P. E.{Mr Elliott - Chief Engineer} 7. C. 18/9/24 | ||