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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).
Data table detailing performance tests of dynamos for a 20 HP chassis with 57 coil armatures.

Identifier  ExFiles\Box 165\6\  img211
Date  12th October 1929 guessed
  
X .5660.
OF DYNAMOS FOR 20 HP. CHASSIS. (57 COIL ARMATURES PRINCIPALLY).

| Cold Controlled | Not controlled Specn. 75°C | Eng. 85°C | Production |
|--- |--- |--- |--- |
| Ampere peak. | Speed. | Ampere peak. | Speed. | Ampere peak. | Speed. | Ampere peak. | Speed. |
| 15.0 | 1375 | 12.0 | 1570 | 11.0 / 9.0 | 1600 / 1550 | 11.0 | 1450 |
| 21.3 | 1530 | 18.0 | 1900 | - | - | - | - |
| 12.8 | 1360 | 10.4 | 1600 | 9.4 | 1620 | 11.4 | 1450 |
| - | - | 11.6 | 1620 | 10.6 | 1640 | 12.5 | 1450 |
| 13.5 | 1370 | 11.0 | 1610 | 10.0 | 1625 | 12.0 | 1450 |
| - | - | 11.8 / 12.0 | 1520 / 1540 | - | - | - | - | 7° / 9°
| - | - | 12.4 / 12.2 | 1750 / 1750 | - | - | - | - | -7° / 9°
| - | - | 12.0 | 1700 | - | - | - | - |
  
  


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