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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).
Test report on a Falcon III engine with a stiffened crankshaft and fitted flywheel to investigate torsional vibration.

Identifier  ExFiles\Box 63\4\  scan0115
Date  6th May 1930
  
RG.{Mr Rowledge} From Hs{Lord Ernest Hives - Chair}/VH.
C. to W.O.T.
C. to A.I.D.

Y4499.
Hs{Lord Ernest Hives - Chair}/VH.1/AJ.6.5.30.

x3865
x4499
x2965

FALCON III ENGINES WITH STIFFENED CRANKSHAFTS.
FLYWHEEL FITTED TO FALCON III ENGINES.

We have carried out a test with a flywheel fitted to the propeller shaft of a Falcon lll engine with the new strengthened crankshaft, as called for under Rg{Mr Rowledge}/Tsn2/LV.17.2.30.

CONDITIONS. -

ENGINE. Falcon lll (3 *P* 1681)
CRANKSHAFT E.35490.
FLYWHEEL Moment of inertia 241 lbs.- ft.²
TEST BED. No.7.

OBSERVATIONS.

It was thought that with the new strengthened crankshaft E.35490 the torsional vibration period might be brought within the normal running range of this engine.
We found that the existence of this period was difficult to trace with the brake set at normal R.P.M. (2000) full throttle. This shews that the period is not a serious one.
Setting the brake at 1500 R.P.M. full throttle, brought out the period a little more clearly, but it was not until further loading was given by setting the brake at full throttle 1000 R.P.M., that we were able to settle upon the point definitely.
  
  


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