◆ SpookStack

In Figure 9, the percentages of impacts in 5 sectors from 0 to 180 have been plotted for Atlas IIAS random-attitude turns out to 280 seconds. (It should be remembered that random-attitude turns are representative of combined random-attitude and slow turns.) For B = 1000, theoretical Mode-5 impact percentages are also plotted in the figure for best-fit values of A obtained by trial and error. 100 Atlas tAS Random-Attitude Failures through280 sec Breakup-q-alphain deg-lb/ft no breakup 20,000 10,000 Percent in 5-deg sector (%) 5,000 10 B1,000 A=1.90 A=2.75 A...3.20. A = 3.45 0.1 0 20 40 60 80 100 120 140 160 180 Angle From Flight Path (deg). Figure 9. Atlas IIAS Simulation Results with B = 1,000 By observing curve shapes, it can perhaps be seen that no single value of A causes a theoretical impact distribution and a distribution of impacts from random-attitude turns to match closely over the entire range of 5 sectors. Attempts to improve the match on one end of the curve by selecting a different A merely degrades the match on 9/10/96 42 RTI