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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).
The results of bumping tests on a crinkled tube radiator with a ball underneath suspension.

Identifier  ExFiles\Box 78\3\  scan0110
Date  22th April 1915 guessed
  
Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}2/L22415.

2.

I attach hereto a sheet giving the results of
various bumping tests all on 2" alternate bumps at 105 revs.
per minute. It will be noticed that there is a great
improvement to the crinkled tube radiator when the ball
underneath suspension is used, but this may vary if further
radiators were used.

The ball underneath crinkled tube radiator does
not give a good enough result however, and I think we ought
to run at least 15 hours without leaks, over 2" bumps.
  
  


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