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).
Page of calculations for current, volts, engine speed, horsepower, and efficiency.

Identifier  ExFiles\Box 35\4\  scan 048
Date  31th August 1921 guessed
  
-2- Contd.

Hence actual current
= (42.5 x 2 x 10^8) / (1.41 x 116 x 4 x 136,500)
= 95.5 amperes.

Volts according to standard
= 10.1

Ohmic volts = 95.5 x .0301
= 2.9

Speed volts 7.2
Speed N = (60 x 10^8 x b x E) / (Z φ P)
= (60 x 10^8 x 2 x 7.2) / (116 x 136,500 x 4)
= 1363.

Engine speed = 94.5

B.H.P. = .00001587 x 1363 x 38.6
= .835

E.H.P. = (10.1 x 95.5) / 746
= 1.293

Efficiency = 64.6

EFC.
  
  


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