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 comparing the crankshaft stiffness and torsional deflection of a 20 HP model against a Lorraine-Dietrich model.
| Identifier | ExFiles\Box 22\4\ Scan079 | |
| Date | 2nd March 1927 guessed | |
| CRANKSHAFT STIFFNESS COMPARISON. STANDARD R.R. 20 H.P. CRANKSHAFT. (SHOWN THUS: ——–) LORRAINE-DIETRICH CRANKSHAFT. (SHOWN THUS: – – – –). TORSIONAL DEFLECTION CURVES. MEASURED IN POSITION IN CRANKCASE WITH FLYWHEEL LOCKED, AND TORQUE APPLIED TO FRONT END. ANGULAR DEFLECTION (RADIANS) APPLIED TORQUE (LBS. FT.) Up READINGS ☉ Down READINGS Δ Down READINGS X Up READINGS □ TORSIONAL RIGIDITY 'C' 20 HP R.R. C = T/θ = 250/.0155 = 16220 LBS. FT. LORRAINE C = T/θ = 400/.014125 = 28350 LBS. FT. FROM CURVES. | ||