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).
Data table of fan speeds corresponding to various thrusts for different fan models.
| Identifier | ExFiles\Box 75\3\ scan0073 | |
| Date | 10th February 1925 | |
| FAN SPEEDS CORRESPONDING TO VARIOUS THRUSTS OF VARIOUS FANS. ~~No. E.A.C.~~ | THRUST (lbs.) | Standard | 3 | 9 | 10 | 14 | 18 | |---------------|----------|------|------|------|------|------| | 1 | 610 | 630 | 650 | 570 | 500 | 565 | | 2 | 812 | 915 | 915 | 760 | 720 | 770 | | 3 | 980 | 1132 | 1115 | 930 | 900 | 915 | | 4 | 1140 | 1325 | 1285 | 1095 | 1065 | 1030 | | 5 | 1285 | 1487 | 1440 | 1240 | 1210 | 1145 | | 6 | 1435 | 1610 | 1560 | 1350 | 1335 | 1250 | | 7 | 1560 | 1720 | 1675 | 1450 | 1445 | 1350 | | 8 | 1680 | 1840 | 1800 | 1560 | 1540 | 1435 | | 9 | 1800 | 1942 | 1905 | 1660 | 1620 | 1520 | | 10 | 1900 | 2050 | 2010 | 1755 | 1710 | 1600 | | 11 | 2000 | 2140 | 2112 | 1840 | 1795 | 1680 | | 12 | 2090 | 2215 | 2220 | 1920 | 1865 | 1760 | | 13 | 2170 | 2265 | 2315 | 2000 | 1945 | 1825 | | 14 | 2260 | — | 2400 | 2080 | 2020 | 1900 | 10.2.25. | ||