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).
Gearbox ratio data for the Standard Phantom II.

Identifier  ExFiles\Box 15\5\  Scan236
Date  23th January 1914 guessed
  
X7310.

(1) STANDARD P.II BOX.

Revs of Prop Shaft per rev :: of engine
4th Speed. | 3rd Speed. | 2nd. Speed. | 1st Speed. | Reverse.
Direct. | .735 | .500 | .285 | .324

Revs of engine per rev of 3rd motion shaft.
4th Speed. | 3rd Speed. | 2nd Speed. | 1st Speed. | Reverse.
Direct | 1.3608 | 1.9984 | 3.5117 | 3.0864

Revs of engine per rev of road wheel. (11/41 axle)
4th Speed. | 3rd Speed. | 2nd Speed. | 1st Speed. | Reverse.
13.727 | 5.065 | 7.454 | 13.4 | 11.5
  
  


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