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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).
Engine vibration issue in a Goshawk 11 vehicle at high speed.

Identifier  ExFiles\Box 25\3\  Scan121
Date  10th June 1924
  
X634

To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce}
c. to CJ.

RE. GOSHAWK 11. VIBRATION.
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}
  
  


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