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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).
Extract from G.W. Hancock's report on a 24-EX vehicle at 6,000 miles detailing dynamo output and condition.

Identifier  ExFiles\Box 163\6\  img047
Date  20th July 1930
  
Y6016

Extract from G.W.Hancock's report dated 20.7.30 on 24-EX at 6,000 miles.

Y6006
Y6016

The output of the dynamo is as follows :-

Half charge :
20 M.P.H. Cuts in
30 M.P.H. 5.5 amps.
40 M.P.H. 8.0 amps.
50 M.P.H. 8.5 amps.
60 M.P.H. 8.5 amps.
70 M.P.H. 8.5 amps.
75 M.P.H. 7.5 amps.

With head, side, tale and facia lamps on :-

20 M.P.H. 7.5amps. discharge
30 M.P.H. 2.0 amps. "
40 M.P.H. 2.0 amps. "
50 M.P.H. 3.0 amps. "
60 M.P.H. 3.5 amps. "
70 M.P.H. 4.0 amps. "

The dynamo brushes have, during the latter part of the mileage, been rather noisy. A light clicking sound is heard which gives an impression that the commutator segments have become uneven.
  
  


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