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 open-circuit volt-speed curves for controlled dynamos under cold and hot conditions.

Identifier  WestWitteringFiles\L\2Jan1924-March1924\  Scan78
Date  14th March 1924
  
C
OPEN CIRCUIT VOLT-SPEED CURVES
OF CONTROLLED DYNAMOS
FOR COLD AND HOT CONDITIONS

E.M.F. (VOLTS)
18
17
16
15
14
13.6 VOLTS
13
12.4 VOLTS
12
11
10

DYNAMO SPEED (RPM)
200
300
400
500
600
700
800
900

Graph Lines (from bottom to top):
ROTAR AT.12 19°C.
ROTAR AT.12 80°C.
E.A.C. B. (UBAS POLES) 15.5°C
SMITH 20 RR & 2111 18°C
E.A.C B. (UBAS POLES) 74.5°C
LONGER LUCAS E575 18°C.
SMITH 20 RR & 2111 75°C.
LONGER LUCAS E575 75°C.
LUCAS E575 18°C.
LUCAS E575 80°C.

Graph Ranges:
RANGE 346-408
RANGE 422-488
RANGE 435-522
RANGE 475-564
RANGE 610-725

Table:
DYNAMO BALANCING SPEED
Cold Hot Range
E.A.C. B. 422 488 66
ROTAX 346 408 62
SMITH 435 522 87
LUCAS(LONG) 475 564 89
LUCAS(E.575) 610 725 115

Handwritten Stamps:
C.R.P. 25-2-24
E7 C 14/3/24
  
  


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