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).
Data sheet comparing clutch leverage and load characteristics for Phantom and Spectre models.
| Identifier | ExFiles\Box 93\3\ scan0030 | |
| Date | 14th March 1935 guessed | |
| - sheet 2 - Leverage, Pedal to Plate:- cont'd.{John DeLooze - Company Secretary} Position of Levers on N.Sch.4412. Phantom. SpectreCodename for Phantom III N.Sch's 4229 to 4404. Pedal right back, before first adjustment. 2 55.2 56.5 Linings fully worn. 4 61.3 61.4 Average Leverage (Pedal Travel Plate Separation). 1 to 3. 53.3 54.4 Leverage from Length of Levers. 56.0 52.6 Total Clutch Spring Loads. Engaged (New). lb. 1 2024 *1932 Fully Out (New). lb. 3 2272 *2180 Engaged (Worn, Pedal right back before first adjustment) lb.2 1984 *1890 Engaged (Fully Worn). lb. 4 (+1900) (*1620) *1596 *As shown on N.Sch.4229. % Reduction in Load due to wear. (+6.2) (*20.0) 17.5 Pedal Plate Loads. Engaged (New). lb. 1 37.4 34.8+3x = 37.8 Fully Out. (New). lb. 3 44.2 41.4+5x = 46.4 Engaged (Worn, pedal right back before first adjust't) lb 2 36.0 33.4+3x = 36.4 Engaged (Fully Worn). 4 31.0 26.0+3x = 29.0 X Load due to pull off spring. | ||