Rolls-Royce Archives
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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).
Calculation and diagram for speedometer drive gearing on a PII model.

Identifier  ExFiles\Box 59\2\  Scan023
Date  16th April 1930 guessed
  
-2-
speedometer drive revs/mile becomes :-
618.1 x 41/11 x 2/18 x 26/8 = 833.

S.T.D. Speedometer Drive Gearing
PII

Speedo-drive
18
26
18 THIS WHEEL HAS 19 TEETH ON 22EX.
2
2nd 3rd Motion Shaft.

HS{Lord Ernest Hives - Chair}/AJL.
  
  


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