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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).
Trade-off between reducing the maximum output and achieving silence for the Lucas E.575 Dynamo.

Identifier  ExFiles\Box 36\4\  scan 143
Date  20th October 1920
  
X.30146

EFC5/T20.10.20.

To Wd.{Mr Wood/Mr Whitehead} from EFC.
c. to Ev.{Ivan Evernden - coachwork}
c. to EP.{G. Eric Platford - Chief Quality Engineer}
c. to Wor{Arthur Wormald - General Works Manager}/Mr. Brock.

X. 3014b - LUCAS E.575 DYNAMO SILENCE.

With reference to your verbal enquiry as to whether we could allow the maximum output of the Lucas E.575 dynamo in the hot condition to be as low as 9 amperes instead of 10, we agree to this, but reluctantly. Our reason for this is that although we consider the loss of output to be a somewhat serious matter in view of the fact that this loss may just make the difference between satisfactory operation and unsatisfactory operation of dynamo battery system in Town running, (the output of the dynamo already being less than we require at slow speeds), we feel that, comparing this loss with the gain of almost perfect silence which we hope to achieve, the former would be considered the lesser of the two evils.

In order now to make the specification of maximum output quite definite we give the following paragraph :-

The dynamo, after being run on load on the bench for four hours with an ambient temperature not less than 18°C and at a speed continually adjusted to secure maximum ampere output, and operating on a battery at a dynamo terminal voltage not less than 14.0, shall have a maximum or peak output in this same hot condition which shall not fall below 9 amperes at an operating terminal voltage of 14.5.

EFC
  
  


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