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 showing the results of a torsional deflection test on a 10 inch clutch disc.
| Identifier | ExFiles\Box 83\3\ scan0122 | |
| Date | 11th December 1940 | |
| TORSIONAL DEFLECTION TEST ON 10" CLUTCH DISC. DEFLECTION - DEGREES. TORQUE LB. FT. DRIVE OVERDRIVE NEW CLUTCH DISC Nº 1 FRICTION 45 TO 55 LB. FT. Testing Dept C Lab Rev/6.B. TMR40 R.{Sir Henry Royce} GB /11.12.40 | ||