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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).
Mr. Royce's suggestion to reduce servo power on the 20 HP model by modifying the cam angle.

Identifier  ExFiles\Box 105\4\  scan0021
Date  20th August 1925
  
To Hs.{Lord Ernest Hives - Chair} from DA.{Bernard Day - Chassis Design}

X. 5370

DA{Bernard Day - Chassis Design}1/M20.8.25.

SERVO ON 20 HP.

Referring to your report on 9-G-111., Hs{Lord Ernest Hives - Chair}3/LG18.8.25., when Mr. Royce returned from his holiday he suggested as a result of his experience that it might be desirable to reduce the power of the servo still more. Experimentally this could be done by altering the angle of the present large diameter cam from 45° to say 50° or even 55°, and the effect on the braking and particularly on the servo jagger, tested.

As soon as we get an opportunity we shall send you a cam which by an increase of dia. will enable 45° to be used with the reduced braking.

DA.{Bernard Day - Chassis Design}
  
  


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