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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 modification of dynamos for 20 HP and Phantom II models to improve high-speed performance.

Identifier  ExFiles\Box 165\6\  img242
Date  14th December 1929
  
EFC2/AM14.12.29 contd.

-9-

The question of modification of existing
arrangements of machines to keep up the curve at high
speeds rather higher than it is in some cases at present,
is having consideration, it is almost certainly impossible
however, to do this without interfering with the early stages
of a curve. In particular one degree finer gauge field
windings are being instructed for trial in each case 20 HP.
and Phantom II dynamos of Intermediate type.

EFC.
  
  


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