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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).
Tyre noise effects and experiments with rubber body mountings.

Identifier  ExFiles\Box 173\4\  img077
Date  29th November 1935
  
To E.{Mr Elliott - Chief Engineer} from Sg.{Arthur F. Sidgreaves - MD}
Copy to Wor.{Arthur Wormald - General Works Manager}Hs.{Lord Ernest Hives - Chair}
BY.RHC.{R. H. Coverley - Production Engineer}C/Cx.{Major Len W. Cox - Advertising Manager}

Visit of Ds. and Grylls to USA.

Referring to E.3/HP.28.11.35, tyre noise effects seem, as you say, to be imputed to transmission through the suspension and amplification by the bodywork and wings.

I am not quite clear, however, why it is that the Cadillac, which we possess, is free of these tyre noises whereas, if I remember correctly, it has the wheels and tyres very much enclosed.

When I was last at Derby and was driven to Nottingham on a P.III, Dodd told me that we should very quickly be making the experiment with the rubber inconnection with the shackles, and I should be glad to know what has happened in regard to this.

If the experiment has been made and has not effected the improvement we need, then I thoroughly agree with you that we ought as quickly as possible to carry out an experiment with a P.II body mounted throughout on rubber with a semi-isolation attachment to dash, and I assume that this could be done on one of the cars now at Derby - preferably one of the recent ones on which tyre noises were very prominent.

I have spoken to Mr.Ward on the telephone and he tells me that he could carry out this work in about two days provided he had a little notice to get rubber pieces ready.

I expect you know that he cannot on the existing bodies introduce the silent-block mountings because of the position, i.e. height of our body brackets.

Will you please, therefore, consult with Hs.{Lord Ernest Hives - Chair} and arrange matters with Park Ward so that one of the cars may be converted as quickly as possible.

Sg.{Arthur F. Sidgreaves - MD}
  
  


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