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 results for the power required to drive a Goshawk radiator fan under various circumstances.
| Identifier | ExFiles\Box 75\3\ scan0220 | |
| Date | 6th January 1925 | |
| POWER REQUIRED TO DRIVE RADIATOR FAN IN VARIOUS CIRCUMSTANCES. No. 23 Goshawk Circumstances :- | Date | Motor field current (amps.) | Motor speed. | Fan speed. S. | Ratio. | Volts across motor brushes. | Motor armature current. | Volts across motor brushes light. | Motor armature current light. | Thrust (lbs). | |---|---|---|---|---|---|---|---|---|---| | 6-1-25 | 1.492 | 440 | 1,000 | 2.27 | 63.43 | 5.20 | 61.69 | 1.93 | 1.312 | | 6-1-25 | 1.492 | 617 | 1,400 | 2.27 | 88.28 | 6.65 | 84.91 | 1.97 | 2.500 | | 6-1-25 | 1.492 | 792 | 1,800 | 2.27 | 112.53 | 8.10 | 109.77 | 2.00 | 4.438 | | 6-1-25 | 1.492 | 970 | 2,200 | 2.27 | 139.13 | 9.90 | 135.34 | 2.06 | 6.500 | | 6-1-25 | 1.492 | 1150 | 2,600 | 2.26 | 165.32 | 12.10 | 160.0 | 2.10 | 9.188 | | ||