Downwash and Wake Behind Plain and Flapped Airfoils (1939)
NASA Technical Reports Server (NTRS) · leaf 14
11 DOWNWASH AND WAKE BEHIND PLAIN AND FLAPPED AIRFOILS agreement is, on the whole, satisfactory, particularly tribution is substituted. A vortex of strength given in the region where the tail plane is usually located, by the amount of the rise is considered to be shed at namely, about 0.75 semispan… … 0 .a .4 .6 .8 1.0 1.2 1.4 1.6 up of the vortex sheet become considerable, as for the -ongitudinal distance from '/j-chord point, semi spans 10- by 30-inch airfoil at C^O.91. Figure 19 shows (a) a = -3.8°; Cz,=0.25. experimental downwash-angle contour maps for the (b) a=3.2°; Cl=0.74. (C) a = 9.2°;…
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