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 table for the power required to drive a radiator fan under various circumstances.
| Identifier | ExFiles\Box 75\3\ scan0230 | |
| Date | 3rd 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. H.{Arthur M. Hanbury - Head Complaints} | Ratio. | Volts across motor brushes. | Motor armature current. | Volts across motor brushes light. | Motor armature current light. | Thrust (lbs). | |---------|-----------------------------|--------------|---------------|--------|-----------------------------|-------------------------|---------------------------------|-------------------------------|---------------| | 2-2-25 | 1.500 | 786 | 1800 | 2.29 | 110.79 | 7.30 | 108.44 | 2.00 | 4.550 | | 2-2-25 | 1.500 | 878 | 2000 | 2.28 | 124.30 | 8.00 | 122.04 | 2.00 | 5.650 | | 3-2-25 | 1.500 | 970 | 2200 | 2.27 | 135.55 | 9.13 | 132.48 | 2.13 | 6.950 | | 3-2-25 | 1.500 | 1057 | 2400 | 2.27 | 148.85 | 9.80 | 140.97 | 2.11 | 8.200 | | ||