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 curves for a standard 20 HP and a Lorraine-Dietrich crankshaft.
| Identifier | ExFiles\Box 25\3\ Scan238 | |
| Date | 29th October 1925 | |
| 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 △ Down READINGS X Up READINGS ☐ TORSIONAL RIGIDITY 'C' 20 H.P. R.R. C = T/θ = 250/.0155 = 16220 LBS. FT. LORRAINE. C = T/θ = 400/.014125 = 28350 LBS. FT. FROM CURVES. PRINT ROOM J-12937/29.10.25 | ||