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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).
Piston leakage, suggesting testing pressure at normal speed rather than leaks at various speeds.

Identifier  ExFiles\Box 74\3\  scan0094
Date  10th October 1926
  
X858

To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce}
c. to EJ. RG.{Mr Rowledge} BY.{R.W. Bailey - Chief Engineer}

R1/104.10.26.

RE, PISTON LEAKAGE. X.8040 X.858

I imagine that new pistons if well made are very gas tight until a certain pressure occurs on top of the piston, when the rings may collapse.

So that instead of leaks at various speeds we ought to try every pressure at normal speed.

Other information willbe good, but the above is vital and urgent.

R.{Sir Henry Royce}
  
  


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