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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).
Report analysing the performance characteristics of an intermediate output dynamo curve.

Identifier  ExFiles\Box 165\6\  img240
Date  14th December 1929
  
EFC2/A14.12.29. contd.

-7-

It will be noted that the intermediate output
curve is quite a good curve with the exception of its rate
of fall at high speeds which is rather more than in the other
two cases. This point is being investigated, and it has
been found so far, that control brush spring pressure may
have some bearing on the slope. The curve has an output
area between 15 and 23 miles per hour not possessed by either
of the other two. A point has been arrived at by my assistant
Mr. Allen that there is for every output curve, and also
from curve to curve, a point which represents the greatest
output in ampere hours per mile. This point is arrived
at by drawing from the origin a tangent to the curve as shown,
contacting with it at the point P.

The appearance of this is such that it seems
probable that the curve for the intermediate output machine
is very nearly that one which actually will give the greatest
number of ampere hours per mile, the speed at which it gives
it being almost exactly 26 miles per hour.

In the event of using only one arrangement of dynamo
for the 20 HP. this machine of intermediate output would
appear to be a very good proposition.

The curves shown on the blue print for 40/50 HP. comprise :-

Firstly, specified curve of output requirements
for 40/50 HP. dynamo as originally considered O.K.
  
  


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