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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.
  
  


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