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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).
Issues with propellor shaft vibrations on specific car models and suggesting potential solutions.

Identifier  ExFiles\Box 148\4\  scan0153
Date  9th September 1940
  
1262

Ev.{Ivan Evernden - coachwork} from Rm.{William Robotham - Chief Engineer}

c. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}
c. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager}

Rm.{William Robotham - Chief Engineer}7/ML.9.9.40.

PROPELLOR SHAFT VIBRATIONS.

The propellor shaft vibrations are so bad on B.V. cars that we shall certainly have continual complaints from customers unless we effect a very marked improvement.

Experience on 9.B.V. indicates that there is considerable difficulty in selecting a good propellor shaft in the first place, and that a good shaft does not stay put more than about three or four thousand miles. It seems to be a fact however, that the long wheel base cars are much better for this propellor shaft trouble than B.V's.

We say this because 3.B.50; 4.B.50; and 30.G.VII have all done quite big mileage and, at the moment, their propellor shafts are giving no trouble.

This fact seems to offer a possible chance of solving the B.V. problem and we should like Ev.{Ivan Evernden - coachwork} and Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} between them, to make an analysis of possible reasons why increasing the wheel base should have an effect on it.

At the same time, we should like Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} to go into the question of fitting the Rolls Royce joint on a B.V. car, as past experience indicates that this was better than the Spicer joint for staying put.

Rm.{William Robotham - Chief Engineer}
  
  


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