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).
Comparison of wind velocity tests on Goshawk car fans with various configurations.
| Identifier | WestWitteringFiles\I\September1922\ Scan51 | |
| Date | 1st September 1922 guessed | |
| COMPARISON OF GOSHAWK FANS. Tests on 3-Goshawk-ll car with original height of radiator - wind velocity measured at 3 points - bonnet fitted during tests. Minus readings show when air is blown out from under bonnet. 16 1/2" standard Fan and Pulley. Engine Revs. | 1st. position. | 2nd. position. | 3rd. position. 500 | - 80 | 310 | 270 1000 | - 450 | 760 | 640 2000 | - 1280 | 1800 | 1680 18" Fan and large pulley. 500 | - 150 | 290 | 220 1000 | - 470 | 790 | 720 2000 | - 1400 | 1800 | 1700 18" Fan and standard pulley. 500 | - 200 | 400 | 360 1000 | - 750 | 920 | 830 2000 | - 1700 | 2340 | 2100 18" Fan and std. pulley with cowling. 500 | 220 | 470 | 370 1000 | 450 | 1000 | 910 2000 | 910 | 2380 | 2320 Large pulley, 18" blades, cowling. 500 | 130 | 300 | 260 1000 | 380 | 800 | 710 2000 | 1000 | 1900 | 1500 | ||