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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).
Torsional oscillation diagrams for a standard 20 HP crankshaft at various RPMs.

Identifier  ExFiles\Box 6\1\  01-page023
Date  9th December 1912 guessed
  
TORSIONAL OSCILLATION DIAGRAMS FOR STD 20 H.P. CRANKSHAFT

1100 R.P.M.
9 OSCILLATIONS PER REV.

1600 R.P.M.
6 OSCILLATIONS PER REV.

2000 R.P.M.

3350 R.P.M.
DOTTED LINE INDICATES THE UNDAMPED CURVE
THREE OSCILLATIONS PER REV.
CRITICAL SPEED

3000 R.P.M.
1/2 OSCILLATIONS PER REV.
DAMPED CURVES SHOWING
PHASE OF OSCILLATION

500 R.P.M.

This Photograph by WRIGHT & LOGAN, Southsea. Copyright. COPIES CAN BE OBTAINED from MESSRS WYMAN & SONS Ltd LONDON, or from them direct at Southsea, mentioning Date, Reference Number and Name of Subject.
  
  


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