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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).
Performance comparison table for various dynamo models based on a routine procedure.

Identifier  ExFiles\Box 60\1\  Scan275
Date  1st April 1927
  
-2-
40/50 H.P. MACHINES.

PERFORMANCE COMPARISON OF DYNAMOS.

(On routine procedure of 1.4.27)

Dynamo. | (4) Speed for 10V. 14V. 17V. | (5) Speed for O amperes. | Peak Speed. Amperes. | 3,400 2500 RPM. amperes. | (6) Speed for 10V. 13.6V. 17V. | (7) Speed for amperes. 0. 8 15.
1. 24S.HO | 910 | 910 | 2,100 | 16.7 | 13.6
2. 24S.HO | 920 | 920 | 2,000 | 16.7 | 13.5
L.H.2.M. | 885 | 885 | 2,150 | 17.4 | 15.0
L.H.1.M | 880 | 880 | 2,100 | 17.6 | 15.0
2. 24S.HO | 875 | 875 | 2,000 | 16.8 | 13.6
3. 24S.HO | 890 | 890 | 1,970 | 16.3 | 14.2
4. 24S.HO | 920 | 920 | 1,900 | 16.1 | 13.2
5. 24S.HO | — | — | — | — | —
6. 24S.HO | 920 | 920 | 2,050 | 17.0 | 14.1
7. 24S.HO | 905 | 905 | 2,030 | 16.3 | 13.5
8. 24S.HO | 900 | 900 | 1,960 | 16.1 | 13.4
  
  


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