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).
Test report on the Goshawk dynamo No.604's output at below-freezing point.
| Identifier | ExFiles\Box 51\1\ Scan362 | |
| Date | 5th March 1924 | |
| X4383 EFC. {E. Fowler Clarke - Electrical Engineer} AC.3. 5th March, 1924. E.4383. GOSHAWKAero EngineCodename for 20HP Car / Aero Engine after KestrelAero Engine DYNAMO OUTPUT AT BELOW FREEZING POINT. A GoshawkAero EngineCodename for 20HP Car / Aero Engine after KestrelAero Engine dynamo No.604 carefully set to comply with the production test output was put, with a thermometer, out-of-doors all night during a frost. In the morning, the temperature registered was about -1°C. The machine was then put on the bench and its maximum output at this temperature, working on the cold battery characteristic, was observed. This was found to be 13.0 amps at about 1300 r.p.m. RJA. | ||