Rolls-Royce Archives
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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 output speed performance curves for a 20/25 Dynamo under various conditions.

Identifier  ExFiles\Box 163\6\  img093
Date  4th December 1930
  
20/25
OUTPUT SPEED PERFORMANCE CURVES
OF
48 COIL. 20/25 DYNAMO AT 80°C.
(12° 123-5°)
BRUSH SETTING TEMPERATURE RISE 65°C
I. AT SCHEDULE TERMINAL VOLTAGES.
II AT A CONSTANT TERMINAL VOLTAGE OF 14.0
III As I. BUT WITH A FIELD RESISTANCE OF 25" OF 26 S.W.G. EUREKA WIRE. (1.8 OHMS.)
I
II
III
DYNAMO R.P.M.
2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000
11/50 AXLE. 31.4" DIA. TYRES.
25 30 35 40 45 50 55
55 F.J.A. 4-12-30
  
  


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