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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 additions to Carter's formula for a 6-cylinder engine and electrical excitation experiments.

Identifier  ExFiles\Box 65\4\  scan0231
Date  3rd May 1923 guessed
  
contd :- -2-

The third diagram attached shews the extra terms that we have added to Carter's formula to make it cover a 4-bearing 6-cyl. engine. I should be interested if you would try it sometime on the example that you have at Cambridge, and let me know the results.

I sent the single-crank stiffnesses (corrected and out-of-bearings) to Carter on Tuesday evening as you required.

I shall be able to send you some experiences with the electrical excitation experiments shortly when we have got a little way ourselves. We shall start on one of our car engines where we know the critical speed accurately.

Yours faithfully,
  
  


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