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).
Comparison of different fan blades and their critical air temperature under idling conditions on a 22.C.V. car.
| Identifier | ExFiles\Box 104\3\ scan0234 | |
| Date | 23th January 1939 guessed | |
| SHEET 2. COMPARISON OF FANS UNDER IDLING CONDITIONS ON 22.C.V. CAR. ENGINE IDLING AT APPROX. 600 R.P.M. IN EACH CASE FOR AT LEAST 20 MINUTES. FAN Critical Air Temperature °C. Std. 25/30. fan blades. 28.0 RHC.{R. H. Coverley - Production Engineer} pressed fan blades. 28.0 EW.947 fan blades. 31.5 Std. Bentley fan blades. 26.0 | ||