Wind Tunnel Tests on Autorotation and the "Flat Spin." (1928)
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10 REPORT NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS Maximum aiitorotational (unstable) tendencies occur in each case just beyond maximum lift, and vary widely in magnitude for the different models. Beyond 35° the characteristics of the monoplanes are practically identical, with small stable… … Cn F=40 M. P. n. Fig. 14.—Force test on Douglas XO-2 airplane, 1/24 scale model. 9 = 55.5 kg/m^ i on Boeing NB-1 seaplane, V" scale model. -5^ ^0 -4 dCA -12 I -16. 80" 30" 10" /O" 70" 40" SO" 60" 30" 20'' Fig. 15.—Rotary stability curves, da Beyond 45° the biplane shows instability, and neutral…
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