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).
Blueprint diagram with calculations for clutch leverage and spring pressure.
| Identifier | ExFiles\Box 181\M13\M13.2\ img130 | |
| Date | 6th November 1931 guessed | |
| 18.G.IV Clutch Leverage & Spring Pressure G54132 Clutch Spring. LOAD 125 LBS. 13.100 CRS 2.250 CRS 3.125 .750 0.58 2.900 Clutch. Lop. G54793 SYNCHRO MESH | ||