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).
Page discussing a new type of impeller design for high-speed requirements.
| Identifier | WestWitteringFiles\V\December1930-February1931\ Scan071 | |
| Date | 23th December 1930 guessed | |
| - 5 - and because they are inherent in the present design, an entirely new type of impeller, designed specially for high speed requirements, offers the only solution to the problem. | ||