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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).
Measurement of drive flexibility and its effect on couplings and flywheel inertia.

Identifier  ExFiles\Box 65\4\  scan0101
Date  25th October 1928
  
E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}
48005
Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}3/LG25.10.28.
48300
Thank you for your E1/M24.10.28. We have been measuring the flexibility of the drive from the clutch backwards and find that it twists a number of degrees under engine torque.
This perhaps explains why a more flexible coupling does not produce any appreciable result. Of course the transmission flexibility is not damped. If the flywheel produced torque reaction, we could easily reduce its inertia to one half and see if it makes any difference.
Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}
  
  


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