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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).
Tests conducted on flywheel vibrations for the 25 HP engine.

Identifier  ExFiles\Box 137\4\  scan0390
Date  30th September 1931
  
x634.

30.9.31

X.634.
X.5300.

25 HP. FLYWHEEL VIBRATIONS.

We have carried out further tests on the tail bearing to LeC.2920. The first test on 19-GIV in conjunction with a stiffened flywheel to GL.{G. Linnett}475 lowered the period from 3300 to 3000 r.p.m. and increased its intensity. We therefore tried the bearing on a thin (1/8") flange flywheel on 12-GIV. This eliminated the period but the engine (14-G6) was not very smooth at high speeds.

We then tried the thin flywheel without a tail bearing. Under this condition there was a very slight vibration on drive and over-run at 2700 r.p.m. During the vibration the flywheel ran .012 out of truth in a vertical plane. A small amount of balance should eliminate this.

Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}
  
  


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