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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 the effects of various loads on jellying, torque reaction, booms, and steering.

Identifier  ExFiles\Box 11\3\  03-page384
Date  8th July 1931
  
To Hs.{Lord Ernest Hives - Chair}
From GWH.{George W. Hancock - Head Chateauroux}

Hotel de France,
Chateauroux,
France.

8.7.31.

25-EX.

THE EFFECT ON JELLYING, TORQUE REACTION, BOOMS AND
STEERING BY VARIOUS LOADS ON THE FRONT TORQUE REACTION DAMPERS.

Tyre Pressures. 35 lbs front
30 lbs rear.

We have carried out a series of tests and have classified the results as follows.

(1) The torque reaction dampers made choc-a-bloc the effect is as follows.

Steering.

The steering is considerably better in regard to oscillations of the wheel. They are of less amplitude and velocity.

Jellying.

Jellying is considerably decreased. We should say an 80% cure. Taking the periods of the wings and headlamps, the headlamps are the steadier of the two. The period of jellying is more pronounced up to 40 MPH, after these periods it gradually becomes less to the percentage stated where it remains consistent.

Booms in the front seats with all windows closed.

The effect on booms makes them more pronounced. These started at 12 MPH, has a peak at 25 MPH and lasts up to 40 MPH, gradually dying out. There is a slight boom at 60 MPH. We also noticed under these conditions that a definite period can be felt on the clutch pedal at 61 MPH and there was also a distinct rattle in the change speed lever.

Booms in the rear seats with all windows closed.

There was a steady rumble from 12 - 40 MPH with a more definite period at 55 - 60 MPH. These values were approx. the same on the retard.

Torque Reaction.

The torque reaction was very noticeable but of short duration. It started at 9 MPH with a maximum effect at 10 and finished at 11 MPH. The effect of this was to cause a rapid
  
  


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