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 torsional deflection curves of standard and stiffer 20 HP crankshafts under torque.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan147 | |
| Date | 27th September 1926 | |
| 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 = (250x60) / (53 x .01745) = 16220 LBS.FT. STIFFER CRANKSHAFT:- C = (250x60) / (45 x .01745) = 19100. LBS.FT. OR 11.8% STIFFER. STIFFER CRANKSHAFT E51976 BUT STD. DIAM. CRANK PINS. alks 27/9/26 | ||