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 query regarding high-speed engine vibration on Goshawk 11 chassis 5-G-11.
| Identifier | ExFiles\Box 74\4\ scan0115 | |
| Date | 1st October 1924 | |
| To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to CJ. x4604 /53 RE. GOSHAWK 11. VIBRATION. R5/M6.10.24. X.4604 X.634 When driving 5-G-11 to the Fen Country there seemed to be a number of occasions such as on the down grade dips in the roads, when the engine seemed to become rather rough and unhappy in its running - i.e. about 63 m.p.h. I should like to know whether you think this is the speed at which we expect to run into the high speed vibration on the engine on this chassis, or whether it would be due to the valves jumping. 5-G-11 I understand, has large crankshaft journals and ought to be O.K. as fast as the car could go. Possibly the axle ratio is low. R.{Sir Henry Royce} | ||