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 of steering self-centring torque versus speed for a car on a 100 ft radius circle.
| Identifier | ExFiles\Box 95\1\ scan0494 | |
| Date | 9th June 1938 | |
| PM III STEERING SELF CENTRING TORQUE TORQUE AT STEERING WHEEL REQUIRED TO KEEP CAR ON 100 FT. RAD CIRCLE. 35 Ex CHASSIS 1/4° CASTOR ANGLE ALL TYRES 2/3 RD. WORN TORQUE - LBS FT. SPEED - M.{Mr Moon / Mr Moore} P. H.{Arthur M. Hanbury - Head Complaints} 7.50 X 18 X 30 LBS/D" 7.00 X 18 X 35 LBS/D" 9.6.38 | ||