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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).
From B.J. to Hs. requesting clarification on engine compression values and percentage reductions.

Identifier  ExFiles\Box 19\7\  Scan063
Date  25th July 1922
  
X790

To Hs.{Lord Ernest Hives - Chair} from B.J.

URGENT.

BJ12/H25.7.22.

ENGINE COMPRESSION. X790

I am seeing C.J. to-morrow (Thursday) afternoon, on his return from abroad, to discuss a number of points, before I start for my holidays.

Can you please, therefore, let me know what will be the difference between following the suggestion made in H2/M25.7.22. of reducing the high compression by 5%, as compared with the present medium compression.

Please say what is the present compression of a high compression and a low compression engine.

Please quote:

(1) The compression of high compression less 5%. [handwritten: again]

(2) The actual medium compression.

Also please quote what percentage reduction would be effected if a high compression engine were reduced to medium compression, so that we may ascertain what a reduction of 5% in high compression engine means, in percentage, as compared with reducing the high compression to medium compression.

B.J.

Encl.

[Stamp: RECEIVED!]
[Stamp: ROLLS ROYCE LTD 26 JUL 1922]
  
  


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