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 variations with 'Steel VI' without expansion, based on speed fraction and efficiency calculations.
| Identifier | ExFiles\Box 54\5\ Scan264 | |
| Date | 5th May 1924 guessed | |
| VARIATIONS WITH STEEL VI WITHOUT EXPANSION SPEED FRACTION Z TAKING UNITY AS NORMAL RUNNING EFFICIENCY = x² / 2(x-y) | z | n | S | r {Sir Henry Royce} /S | r.4343/S | log e^(-r {Sir Henry Royce} /S) | e^(-r {Sir Henry Royce} /S) | e^(-2r/S) | x | y | C' | Sx | S/2 y | Average D.C. Fraction | R.M.S. of A.C. Fraction | R.M.S. of Total Current (D.C.=UNITY) | Form Factor | x²/2 | x-y | η | |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| | .2 | 14 | .0530 | 9.44 | 4.100 | bar(5).900 | 10^-5 * 7943 | 10^-9 * 631 | 1.000 | 1.000 | 3.16 | .053 | .0265 | .456 | .649 | 1.442 | 2.05 | .500 | 8.44 | .059 | | .4 | 28 | .1061 | 4.710 | 2.043 | bar(3).957 | 10^-3 * 9057 | 10^-5 * 820 | .991 | 1.000 | 3.13 | .105 | .0530 | .395 | .585 | 1.249 | 1.85 | .490 | 3.719 | .076 | | .6 | 42 | .1591 | 3.140 | 1.362 | bar(2).638 | .0434 | .0019 | .957 | .998 | 3.02 | .152 | .0794 | .348 | .525 | 1.100 | 1.66 | .459 | 2.183 | .210 | | .8 | 56 | .2122 | 2.354 | 1.021 | bar(2).977 | .095 | .009 | .905 | .991 | 2.86 | .192 | .1051 | .308 | .470 | .974 | 1.525 | .410 | 1.449 | .283 | | 1.0 | 70 | .2653 | 1.882 | .818 | bar(1).182 | .152 | .023 | .848 | .977 | 2.68 | .225 | .1295 | .275 | .424 | .870 | 1.54 | .360 | 1.034 | .348 | | 1.2 | 84 | .3183 | 1.570 | .682 | bar(1).318 | .208 | .043 | .792 | .957 | 2.50 | .252 | .1520 | .248 | .384 | .784 | 1.515 | .314 | .778 | .404 | | 1.4 | 98 | .3714 | 1.346 | .585 | bar(1).415 | .260 | .068 | .740 | .932 | 2.34 | .275 | .173 | .225 | .351 | .711 | 1.56 | .274 | .606 | .452 | | 1.6 | 112 | .4244 | 1.180 | .512 | bar(1).488 | .3076 | .094 | .692 | .906 | 2.18 | .294 | .1925 | .206 | .323 | .651 | 1.57 | .239 | .488 | .489 | | 1.8 | 126 | .4775 | 1.047 | .455 | bar(1).545 | .351 | .123 | .649 | .877 | 2.05 | .310 | .2094 | .190 | .298 | .601 | 1.57 | .211 | .398 | .530 | | 2.0 | 140 | .5306 | .942 | .409 | bar(1).591 | .390 | .152 | .610 | .848 | 1.93 | .324 | .2248 | .176 | .277 | .557 | 1.57 | .186 | .332 | .561 | | 2.2 | 154 | .5836 | .858 | .373 | bar(1).627 | .424 | .180 | .576 | .820 | 1.82 | .336 | .2390 | .161 | .259 | .518 | 1.58 | .166 | .282 | .589 | | 2.4 | 168 | .6367 | .785 | .341 | bar(1).659 | .456 | .208 | .544 | .792 | 1.72 | .346 | .2520 | .154 | .245 | .487 | 1.59 | .148 | .241 | .615 | | 2.6 | 182 | .6897 | .726 | .315 | bar(1).685 | .4842 | .235 | .516 | .765 | 1.63 | .356 | .2625 | .144 | .227 | .456 | 1.57 | .133 | .210 | .633 | | 2.8 | 196 | .7428 | .673 | .292 | bar(1).708 | .511 | .260 | .489 | .740 | 1.55 | .364 | .2745 | .136 | .215 | .430 | 1.58 | .120 | .184 | .651 | | ||