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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).
Letter to a supplier discussing the use of rubber bearings and potential noise issues compared to 'Silentbloc' bearings.

Identifier  ExFiles\Box 154a\2\  scan0106
Date  11th May 1939
  
H of H
1305

Experimental Dept.

Rm {William Robotham - Chief Engineer} /AFM. {Anthony F. Martindale} 1/MH. {M. Huckerby}

11th. May, 1939.

Messrs. E.I.du Pont de Nemours & Co.,
Bush House,
Aldwych,
LONDON, W.C.2.

Your Ref: FGS/MEL.

Dear Sirs,

"OREL".

We thank you for your letter of 9th. inst. and enclosure.

The reason, perhaps, that we have been rather slow in this matter is that we have never heard any of our rubber bearings or mountings emit any noise whatever. It is true that on some of the smaller cars in this Country misalignment causes "Silentbloc" bearings to move sideways allowing metal to metal contact and therefore noise, and that in these instances a lubricant not detrimental to rubber would be invaluable. However, we would consider we had failed in our object of fitting rubber bearings should this occur, because the object in fitting them is to eliminate lubrication points.

You will understand that your insistence on a report places us in a difficult position because until we get a squeak from our rubber bearings we cannot say if "Orel" will stop it.

As we are increasing the use of rubber bearings on our chassis the writer was anxious to obtain a sample of your product more or less as a precaution, in case trouble should develop. The fact that your Corporation should think
  
  


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