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).
Technical note comparing vibration and connecting rod length between Goshawk I and Goshawk 11 engines.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan169 | |
| Date | 11th August 1920 guessed | |
| (2) are still on the comparatively flat part of the curves. Goshawk 1. is said to be free of the vibration which occurs at very high speeds on Goshawk 11. The difference in con. rod length between these two engines is not great. E.{Mr Elliott - Chief Engineer} | ||