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 data table showing power required to drive a 2nd Goshawk radiator fan under various circumstances.
| Identifier | ExFiles\Box 75\3\ scan0224 | |
| Date | 13th January 1925 | |
| POWER REQUIRED TO DRIVE RADIATOR FAN IN VARIOUS CIRCUMSTANCES Test No. A.{Mr Adams} 25 Circumstances:- 2ND Goshawk fan with blades similar to ~~Maltese X~~ | Date. | Motor Field Current (amps). | Motor Speed. | Fan Speed. R.P.M. | Ratio. | Volts across motor brushes. | Motor armature current. | Volts across motor brushes light. | Motor armature current light. | Thrust (lbs). | |---|---|---|---|---|---|---|---|---|---| | 13-1-25 | 1.472 | 617 | 1400 | 2.27 | 88.49 | 5.22 | 86.55 | 2.16 | 2.000 | | 13-1-25 | 1.472 | 794 | 1800 | 2.27 | 113.04 | 5.70 | 112.53 | 2.09 | 3.000 | | 13-1-25 | 1.472 | 969 | 2200 | 2.27 | 137.49 | 6.45 | 134.22 | 2.19 | 4.125 | | 13-1-25 | 1.472 | 1145 | 2600 | 2.27 | 162.86 | 7.67 | 158.77 | 2.14 | 5.375 | | ||