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. | ||