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 showing fan speeds corresponding to various thrusts for different types of fans.
| Identifier | ExFiles\Box 75\3\ scan0032 | |
| Date | 19th December 1924 guessed | |
| 2ND Set of curves (E) FAN SPEEDS CORRESPONDING TO VARIOUS THRUSTS OF VARIOUS FANS. THRUST (lbs.) Columns: (1) Std. 40/50 6-bladed Fan. (2) Std. 40/50 6-bladed fan with 3 blades removed. (3) F.A.C. 4-bladed Fan. (4) Hispano Fan. (5) High Speed 6-bladed Fan. (6) High speed Fan with 3 blades removed. (7) Goshawk Fan. (9) 40/50 Std. Fan with handing back blades. (10) [Column crossed out] Std. Fan with Dengling/tack blades - 3 blades removed. (8) Prof. Watt Fan. Data Table (Rows 1-14 correspond to increasing thrust levels): Row | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (9) | (10) | (8) --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- 1 | 610 | 730 | 630 | 810 | 608 | - | 835 | 650 | 570 | 620 2 | 812 | 1050 | 915 | 1160 | 840 | - | 1210 | 915 | 760 | 880 3 | 980 | 1300 | 1132 | 1420 | 1020 | - | 1490 | 1115 | 930 | 1090 4 | 1140 | 1520 | 1325 | 1620 | 1180 | - | 1720 | 1285 | 1095 | 1270 5 | 1285 | 1710 | 1487 | 1810 | 1320 | - | 1930 | 1440 | 1240 | 1425 6 | 1435 | 1880 | 1610 | 1980 | 1430 | - | 2120 | 1560 | 1350 | 1570 7 | 1560 | 2040 | 1720 | 2120 | 1545 | - | 2280 | 1675 | 1450 | 1700 8 | 1680 | 2180 | 1840 | 2285 | 1660 | - | 2440 | 1800 | 1560 | 1825 9 | 1800 | 2295 | 1942 | 2440 | 1770 | - | 2600 | 1905 | 1660 | 1940 10 | 1900 | 2385 | 2050 | 2600 | 1880 | - | 2740 | 2010 | 1755 | 2045 11 | 2000 | 2465 | 2140 | - | 1970 | - | - | 2112 | 1840 | 2145 12 | 2090 | - | 2215 | - | 2050 | - | - | 2220 | 1920 | 2250 13 | 2170 | - | 2265 | - | 2125 | - | - | 2315 | 2000 | 2350 14 | 2260 | - | - | - | 2205 | - | - | 2400 | 2080 | 2450 | ||