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).
Graphical comparison of crankshaft stiffness and torsional deflection curves for a standard 20 HP and a Lorraine-Dietrich crankshaft.
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 72 | |
| Date | 2nd March 1927 | |
| CRANKSHAFT STIFFNESS COMPARISON. STANDARD R.R. 20 H.P. CRANKSHAFT. (SHEWN THUS: -----) LORRAINE-DIETRICH CRANKSHAFT. (SHEWN 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 O DOWN READINGS Δ 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. TEST ROOM 2 MAR 1927 DERBY 2/3-27 | ||