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).
Mathematical analysis of the behavior of 40/50 & EAC governors.
| Identifier | ExFiles\Box 66a\3\ scan0032 | |
| Date | 1st January 1925 guessed | |
| -2- GENERAL. RESPECTIVE BEHAVIOUR OF 40/50 & EAC. GOVERNORS. Let engine r.p.m. be n. R.P.M. pull from governor be X lbs. " " " spring x lbs. Rating of " " " p lbs/1". Let engine revs. fall by r.{Sir Henry Royce} R.P.M. Then new pull of the governor = x((n - r)^2 / n^2) lbs. Consequent movement of controlling spring end will be - x{(n - r)^2 / n^2} ins. Now on 40/50 HP. 1" movement at the end of the controlling spring gives the complete range of throttle opening. . Fraction of total opening by which the throttle opening is increased for a drop of n. R.P.M. (x((n - r)^2 / n^2)) / p On the EAC. .4" movement at the end of the controlling spring gives 45º movement to the camshaft of throttle slow opening cam. . Increase in camshaft degrees of rotation for a drop of n. R.P.M. (x((n - r)^2 / n^2) / p) x (45º / .4") but the value of 1º camshaft rotation as regards throttle opening varies from 1/∞ to 1º Therefore in the case of the EAC. there is no constant fraction by which the throttle is opened for a drop of n. R.P.M. contd :- | ||