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 cooling efficiency and noise levels for different fan designs against a standard model.
| Identifier | ExFiles\Box 14\7\ Scan063 | |
| Date | 3rd July 1934 | |
| -5- Hs{Lord Ernest Hives - Chair}/Std.14/KW.3.7.34. Fans. The staggered bladed fan to LeC.3766 is equal in cooling efficiency to the standard Ph.II fan and definitely quieter. The American variable pitch fan tested is more efficient from a cooling standard than standard Ph.II fan and is approximately equal for noise - hence we propose to reduce the size of this fan until sufficiently quiet and then re-test it for cooling. Hs{Lord Ernest Hives - Chair}/C.S. Steadman. | ||