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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).
Agreeing to test tapered valve springs against parallel ones for superiority regarding periodic vibrations.

Identifier  ExFiles\Box 17\6\  Scan097
Date  25th March 1929
  
Hs.{Lord Ernest Hives - Chair}
BY.{R.W. Bailey - Chief Engineer}
c. to SG.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer}

+7060
R9/M25.3.29.

VALVE SPRINGS. X. 290
X. 7060

Though we are in a good position as regards these on all our work we have agreed that it would be worth while to make a well tapered spring of exactly the same mean characteristics, and test by examination (while running) and life if these are definitely superior to parallel ones over a wide range of speeds, for periodic vibrations.

R.{Sir Henry Royce}
  
  


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