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).
Extract regarding gear hum from the Goshawk engine and a method to cure it using a fine cutting powder.
| Identifier | ExFiles\Box 56\3\ Scan052 | |
| Date | 28th September 1920 | |
| X.3551 Extract from Hs{Lord Ernest Hives - Chair}2/LG28.9.20. X.3481. RE "GOSHAWK" ENGINE. oil pump The chief outstanding noise was a gear hum from the X.3551. After we had cured the hum from the helical gear wheels. We are making arrangements to run these gears in with a fine cutting powder similar to what we do with the 40/50 engine gears. | ||