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' clutch disc.
| Identifier | ExFiles\Box 83\3\ scan0125 | |
| Date | 24th November 1940 | |
| TORSIONAL DEFLECTION TEST ON 10" CLUTCH DISC. NEW CLUTCH DISC Nº 4. FRICTION 18-20 LB. FT. DEFLECTION - DEGREES. DRIVE & OVERDRIVE TORQUE LB. FT. TEST BY R.G. CLEMENTS | ||