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 torsional deflection curves comparing standard and stiffer 20 HP crankshafts.
| Identifier | ExFiles\Box 6\1\ 01-page022 | |
| Date | 21th July 1923 | |
| 20. H.P. R.R. CRANKSHAFTS TORSIONAL DEFLECTION CURVES. MEASURED IN POSITION IN CRANKCASE WITH F.W. LOCKED AND TORQUE APPLIED AT FRONT END. REFLECTING BEAM OF LIGHT METHOD. ANGULAR DEFLECTION. MINS. TORQUE. lbs.Ft. DEFLECTION BETWEEN F.W. & SLIPPER DRIVE HUB. STANDARD CRANKSHAFT. STIFFER CRANKSHAFT. DOWN READINGS UP READINGS TORSIONAL RIGIDITY. 'C' STANDARD CRANKSHAFT:- C = T/θ = (250 x 60) / (53 x .01745) = 16220 LBS.FT. STIFFER CRANKSHAFT:- C = (250 x 60) / (45 x .01745) = 19100 LBS.FT. OR 11.8% STIFFER. STIFFER CRANKSHAFT EE1376 BUT STD DIAM. CRANK PINS. ack 21/7/23 | ||