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 detailing the power required to drive a radiator fan under various circumstances.
| Identifier | ExFiles\Box 75\3\ scan0228 | |
| Date | 2nd February 1925 | |
| POWER REQUIRED TO DRIVE RADIATOR FAN IN VARIOUS CIRCUMSTANCES Test No. 27. Circumstances:- Y | Date. | Motor field current (amps). | Motor speed. | Fan speed. | Ratio. | Volts across motor brushes. | Motor armature current. | Volts across motor brushes light. | Motor armature current light. | Thrust (lbs). | |---|---|---|---|---|---|---|---|---|---| | 31-1-25 | 1.500 | 87 | 200 | 2.30 | 14.63 | 3.59 | 13.61 | 1.67 | — | | 31-1-25 | 1.500 | 174 | 400 | 2.29 | 26.7 | 4.14 | 25.17 | 1.79 | .115 | | 31-1-25 | 1.500 | 262 | 600 | 2.29 | 38.98 | 4.50 | 37.24 | 1.88 | .400 | | 2-2-25 | 1.500 | 349 | 800 | 2.29 | 51.56 | 5.65 | 49.61 | 2.14 | .855 | | 2-2-25 | 1.500 | 437 | 1000 | 2.29 | 63.12 | 5.74 | 61.89 | 2.14 | 1.368 | | 2-2-25 | 1.500 | 527 | 1200 | 2.28 | 75.19 | 5.93 | 73.76 | 2.07 | 2.020 | | 2-2-25 | 1.500 | 611 | 1400 | 2.29 | 87.98 | 6.30 | 86.44 | 2.04 | 2.730 | | 2-2-25 | 1.500 | 698 | 1600 | 2.29 | 99.23 | 6.90 | 97.70 | 2.05 | 3.650 | | ||