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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 page comparing the performance of Wright Co. and English air-cooled engines concerning octane fuel.

Identifier  ExFiles\Box 27a\4\  Scan199
Date  7th September 1933 guessed
  
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As a matter of opinion, I would say that the Wright Co. are rather optimistic in the curve shown, particularly for air-cooled engines, but in the pencilled-in curve the English engines appear in some respects to make more use of a given Octane number fuel than the American ones, at the upper end of the curve, I mean.

I should be very grateful if you could give me any "dope" on this.

Incidentally, it is only fair to say that I am asking the Bristol Co. to let me have similar information, because I wish to compare equivalent air-cooled equipment.

Yours sincerely,
FRBanks.

FRB/WNT
  
  


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