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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).
Aero engine fuel specifications D.T.D. 224 & 230 and octane values for type tests.

Identifier  ExFiles\Box 27a\4\  Scan256
Date  16th November 1933
  
BY/EM
C. Roy.{Sir Henry Royce}
Hs{Lord Ernest Hives - Chair}
81282
YNG
EP{G. Eric Platford - Chief Quality Engineer}/Thp3/MH.{M. Huckerby}16.11.33

re AERO ENGINE FUEL TO SPECIFICATIONS D.T.D.224 & 230
----------------------------------------------------

With reference to your memo BY/EM3/J.15.11.33, when special fuel is used for type test it is possible, and we will arrange accordingly, to specify the purpose for which the fuel is required.

In quite a number of cases, however, type tests are run on standard fuel, which is now D.T.D.224, and we shall be using this fuel for type tests and production tests concurrently.

In view of this it would appear that all standard D.T.D.224 fuel should be within the range of + 1 of the octane value, which is specified for type tests.

EP{G. Eric Platford - Chief Quality Engineer}/Thn
  
  


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