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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).
Chart of dynamo output at different speeds under various electrical loads.

Identifier  ExFiles\Box 165\6\  img005
Date  30th August 1925
  
X5660

Hotel de France,
Chateauroux,
Indre, France.

GWH.{George W. Hancock - Head Chateauroux}2/Crn/30.8.25.

To Hs.{Lord Ernest Hives - Chair} copy to EFC
From G.W. Hancock.

Chassis 9-GIII. X.5660. X.4610.

We have taken a chart of the output of dynamo, as follows :-

No Lights. Battery ignition only.

m.p.h. 10. 14. 15. 20 25 30
amps. 0. 5. 6.5 8. 7.5 6

m.p.h. 35 40. 45 50 55. 60.
amps. 5 4.5 4.5 4 3.5 3.5

Battery ignition, side & tail lamps.

m.p.h. 10 15 20 25 30 35
amps. 0 5 5.5 5.5 5 4.5

m.p.h. 40 45 50 55. 60
amps. 3. 2. 2. 2. 2.

Battery ignition, head side & tail lamps.

m.p.h. 10. 15. 17 25 30 35
amps. 0. 0. 0. -0.5 -1. -2.

m.p.h. 40. 45. 50
amps. -2.5 -3. -3.

Dynamo at speeds of 10, 15 & 17 m.p.h. is just maintaining current used.

G.W. Hancock.
  
  


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