Graph of HP vs Fan Speed curves for a standard 6-blade fan and the same fan with 3 blades removed.
| Identifier | ExFiles\Box 75\3\ scan0022 | |
| Date | 20th November 1924 | |
| H.P.—FAN SPEED CURVES OF VARIOUS FANS. 1. STD 40/50 6 BLADE FAN. 2. STD 40/50 FAN WITH 3 BLADES REMOVED. Y-AXIS: H.P. X-AXIS: FAN SPEED. (R.P.M.). C. NEW 20-11-24 E.7.4 20/11/24 | ||
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).