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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).
Graph of representative output curves for a standard 20 HP dynamo under various conditions.

Identifier  ExFiles\Box 180\M2\M2.7\  img027
Date  24th March 1927
  
AMPERE OUTPUT
OPERATING VOLTAGES
0
1 13.6
2 13.7
3 13.85
4 14.0
5 14.1
6 14.2
7 14.35
8 14.5
9 14.6
10 14.7
11 14.85
12 15.0
13 15.1
Output at 70°C set by General Specification.
Output at 20°C set by General Specification.
Output at 20°C set to production test.
Ditto minus ignition current.
(1)
(2)
(3)
(4)
(5)
REPRESENTATIVE OUTPUT CURVES
OF
STANDARD 20 H.P. DYNAMO
UNDER VARIOUS CONDITIONS.
Field current at 70°C set by General Specification.
CHASSIS M.P.H
11/50 AXLE
31.4" DIA TYRES.
DYNAMO R.P.M.
0 5 10 15 20 25 30 35 40 45 50 55
0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000
A.D. 638
24.3.27
  
  


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