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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 discussing the suitability of AC.9 as a bearing material for high-speed petrol engines.

Identifier  ExFiles\Box 115\4\  scan0033
Date  9th November 1939
  
J.{Mr Johnson W.M.} Howlett, Esq.
-2-
9th. November, 1939.

We have done such a lot of work on the subject and there appears to be so many confusions of thought that at the moment I am considering writing a paper on bearings.

If, however, you meet anybody who says that I have stated that there is a better material than AC.9 for a big-end bearing where prices are not the first consideration, then I should like to know of it.

I have never said AC.9 is a good main bearing material for high speed petrol engine work, and I think that in the end it would only damn the bearing for other purposes if we pretended that it was satisfactory under conditions where it has not actually given good results.

Yours sincerely,

P.S. I hope your pheasants have been flying better than the Messerschmitts. I managed to get away for one day at the partridges, and with the wind up their tails they were well worth while.
  
  


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