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).
Calculations and test results for a standard starter motor.
| Identifier | ExFiles\Box 61b\3\ scan0105 | |
| Date | 17th July 1928 guessed | |
| -5- Example:- For X.3082. R.R. Standard Starter Motor. 10^5 b / Z P = (10^5 x 2) / (90 x 4) = 10^4 / 18 ℓ = 10^5 / 3 = 10^4 / 25.36 = 394 TN = ℓ e C = 84.5 e C At 100 amperes :- Torque on brake test = 47.5 lb-inches, whence Φr = 394 x .475 = 187 kilolines. Torque on static torque test = 54.0 lb-inches. whence Φs = 394 x .540 = 213 kilolines. Volts/Speed on E.M.F. test = .00875 whence Φe = 675 / 3 = 225 kilolines. Terminal volts on brake test = 9.80 Speed " " " = 1130 R.P.M. whence ΦE = (10^5 / 3) x (9.80 / 1130) = 289 kilolines. ηe = Φs / ΦE = .737, ηm = Φr / Φs = .878. η = ηe ηm = .647, ηa = Φs / Φe = .947. EFC. | ||