Installation of a new, larger propeller shaft for the 'Goshawk' model.
| Identifier | ExFiles\Box 77\1\ scan0126 | |
| Date | 31th January 1922 | |
| from DA. {Bernard Day - Chassis Design} Copy to BN. {W.O. Bentley / Mr Barrington} Copy to EFC. {E. Fowler Clarke - Electrical Engineer} X 3539 DA {Bernard Day - Chassis Design} 3/CB11-1-21. X.3539 RE "GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))" PROPELLER SHAFT. We have put a new propeller shaft in, which is .010 larger in diameter than the one which broke, because we had one standing by. {R.W. Bailey - Chief Engineer} The effect has been to raise the point at which the critical speed occurs from 10 to 12 miles an hour. It has also somewhat reduced the strength of the period. I send this as the latest information indicating that the period is effected by the diameter of the propeller shaft. We were proposing to put in a propeller shaft 1.5 dia. instead of 1.425. The outstanding feature of the "Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))" is the extraordinary softness of the engine, which cannot be felt at any speed after about 10 miles an hour, in which respect it differs very considerably from the American cars we have tried in which the sensation of the engine being there is present all the time. [STAMP] EFC {E. Fowler Clarke - Electrical Engineer} JAN 31 1922 DA. {Bernard Day - Chassis Design} [STAMP] RECEIVED. [UPSIDE DOWN TEXT] R.R. 286A 100 (T).S.H. 169. 11-8-20 (T) G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 2200 | ||
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).