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 showing the brake efficiency and performance characteristics of a Zenith starter motor during a brake test.

Identifier  ExFiles\Box 35\4\  scan 109
Date  3rd May 1921
  
STARTER MOTOR BRAKE EFFICIENCY
REF. No. Z.S.710.B/4 DATE. 3.5.21
ZENITH STARTER
ON BRAKE TEST
Armature. No. 1.

AXES LABELS AND SCALES:

VERTICAL AXES (from top to bottom):
R.P.M: 3000, 2700, 2400, 2100, 1800, 1500, 1200, 900, 600, 300, 0
B.H.P: 2.0, 1.8, 1.6, 1.4, 1.2, 1.0, .8, .6, .4, .2, 0
AMPERES: 250, 225, 200, 175, 150, 125, 100, 75, 50, 25, 0
VOLTAGE: 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0
EFFICIENCY: 1.0, .9, .8, .7, .6, .5, .4, .3, .2, .1, 0
ELECTRICAL H.P: 4.0, 3.6, 3.2, 2.8, 2.4, 2.0, 1.6, 1.2, .8, .4, 0

HORIZONTAL AXIS:
TORQUE (POUND INCHES): 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110

LABELS ON PLOTTED LINES:
R.P.M.
B.H.P.
AMPERES
EFFICIENCY
ELECTRICAL H.P.
  
  


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