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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).
Comparing the torsional balance of twin-five, six-cylinder, and twin-six engines.

Identifier  WestWitteringFiles\S\March1928-May1928\  Scan058
Date  29th March 1928
  
ORIGINAL
To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Tsn.
Hs{Lord Ernest Hives - Chair}/Tsn1/LG29.3.28.
TWIN-FIVE ENGINE BALANCE. A482
In reply to E3/M24.3.28., it was certainly an exaggeration of mine to say that the torsional balance of the twin-five is comparable with that of the six-cyl.
I have worked out to find the actual ratio of comparison with the same cylinders, and it is about 60 to 1, so that the twin-five is almost as good as the twin-six, i.e., excellent for torsional balance,
Hs{Lord Ernest Hives - Chair}/S.S.Tresilian.
  
  


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