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).
Comparison of clutch data for the Phantom II and Phantom III Spectre models.
| Identifier | ExFiles\Box 93\3\ scan0026 | |
| Date | 14th March 1935 | |
| Clutch Data, Phantom + SpectreCodename for Phantom III (Cont'd) 14. 3. 35. TABLE DATA: Headings: Position of Levers on M&N 4412 | Phantom II | Phan. III SpectreCodename for Phantom III M&N 4229 to 4404 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} *As Designed {+6.2, *20.0} | *1596 % Reduction in Load due to wear: - | - | 17.5 Pedal Plate Loads: Engaged (New) lb: 1 | 37.4 | 34.8+3=37.8 x Fully out (New) lb: 3 | 44.2 | 41.4+5=46.4 x Engaged (Worn, Pedal right back before first adjustment) lb: 2 | 36.0 | 33.4+3=36.4 x " (Fully Worn) lb: 4 | 31.0 | 26.0+3=29.0 x Note under Phantom II column: x Load due to pull. off spring. Outside Dia. of Linings ins.: - | 13.9 | 13.5 Intensity of Pressure on Linings lb/□": 1 | 33.2 | 26.8 Coefft of Friction: (New): 1 | .177 | .176 (Fully Worn): 4 | {+.188, *.222} | .216 Max Torque lb ins: - | 4300 | 3930 Note in Phan. III SpectreCodename for Phantom III column: N.B. FOOTNOTES: + Distance Washer removed * Distance Washer not removed. | ||