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).
Graph plotting Wraith III camshaft torque against camshaft angle at 4500 RPM.
| Identifier | ExFiles\Box 107\2\ scan0165 | |
| Date | 9th April 1938 guessed | |
| WRAITH III CAMSHAFT TORQUE SPEED 4500 R.P.M. FRICTION NEGLECTED LBS INS TORQUE DUE TO BALANCER INERTIA AND SPRINGS ONLY TORQUE DUE TO VALVE INERTIA VALVE SPRINGS, GAS PRESSURE WITHOUT BALANCER. CAMSHAFT ANGLE DEGREES | ||