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 relating to engine torque, power, and electrical efficiency.
| Identifier | ExFiles\Box 64\2\ scan0108 | |
| Date | 4th July 1928 | |
| X. 7625A X.7625A. NEW ASPECT OF CALCULATIONS EFC/T1.6.27. Engine 1100 lb-inches 35 r.p.m. On conductors :- 1440 lb-inches at 35 r.p.m. or at 13 : 1 ratio. 110.5 lb-inches at 455 r.p.m. Power .80 H.P. = 597 watts. Elec. Eff. assumed .417 Power supplied = 1430 watts 165 a.{Mr Adams} at 8.70 volts Back E.M.F. = 3.62 volts. Volts = 3.62 Speed = 455 r.p.m. Amperes = 165 Torque = 110.5 lb-inches. Resis. = 5.08 / 165 = .0308 Ω ØZ = (60x10^8x2x3.62) / (455 x 4) = 23.8 x 10^6 or ØZ = (10^8 x 2 x 110.5) / (1.41 x 4 x 165) = 23.8 x 10^6 Ø = 205,000 Z = 116 EFC. | ||