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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).
Experimental trials for car 129-GN, focusing on reducing excessive drumming, booming, and steering-wheel vibration.

Identifier  ExFiles\Box 18\3\  Scan276
Date  2nd October 1931
  
x7960.
RECEIVED 1931 OCT 3
WT.6/WT2.10.31.
17x634

Pg...from PN.{Mr Northey}
Copy to Hs.{Lord Ernest Hives - Chair}

129-GN. Trials.

Mr. Leslie from the Experimental Dept. spent most of the day on this car yesterday with a view to trying to reduce the excessive drumming and booming, especially at the back, primarily at between 15 and 32 m.p.h.

I had complained also that the torque-reaction vibration felt on the steering-wheel was excessive.

On testing this car this morning, subsequent to Mr. Leslie doing all that he could, I was able to agree that the booming at the back had been considerably reduced, to the extent that I feel that we are now justified in using the car, but at the same time the vibration on the steering wheel at the speeds referred to is undoubtedly a bit worse. Fortunately, this unpleasant characteristic is not known to a large majority of people who are given runs on this car, that is, a very few would wish to drive it when on a trial run.

I have given the driver special instructions in relation to the driving of this car in order to make the best of what is not a very good job.

PN.{Mr Northey}
  
  


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