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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).
Calculations and analysis of servo efficiency and cam angles.

Identifier  ExFiles\Box 16\3\  Scan031
Date  21th December 1928 guessed
  
contd :- -4-

DIRECT : 16.65/6.25 x 1.375/1.725 x 2.00/2.00 x 1.875/4.00 x 2.85 x 16.2 = 21.5

SERVO REAR : 16.65/6.25 x 1.37/1.725 x 2.125/2.00 x 2.85/4 x 16.2 X S =
26.5 X S = 26.5 X .85 = 22.3

SERVO FRONT : 16.65/6.25 x 1.37/1.7 x 1.75/1.75 x 14.5 X .85 = 26.6

This gives 37.6%xxxxx to the front - assuming
the higher value of µ= .2 the % to the front becomes 41.
We think that on 16-EX as it left for France the % to front was
about 35 but can say more accurately when we have measured the
servo efficiency with spring balances.

We think that 45° cams are more desirable than
30° cams though the latter appeared to operate satisfactorily
on this car.

Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}
  
  


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