Rolls-Royce Archives
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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 from Maurice Olley regarding gearbox noise and suggestions for gear helices.

Identifier  ExFiles\Box 137\5\  scan0092
Date  1st September 1929 guessed
  
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Altogether it is rather wonderful that the 2nd speed is as quiet as it is having only a thin whine on drive and not too much noise on overrun.

I would suggest that if Coverley makes up a similar box and gets his gear helices running true and the driven gear free endways, you should get rather wonderful results.

Apparently you were very wise to use standard single-helical side shaft gears.

Very truly,
Maurice Olley
Maurice Olley

M
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