AERODYNAMIC PROFILE OF WING OF WING-IN-GROUND-EFFECT MACHINE Russian patent published in 1998 - IPC

FIELD: wings and lifting surfaces of wing-in-ground-effect machines. SUBSTANCE: range of lift coefficients C_st is extended; inherent stability of wing profile of wing-in-ground-effect machine is ensured at altitudes both at heavy ((H<0,4B_A)) and weak ((H>0,4B_A)) screen effect. Aerodynamic profile has nose 4, trailing-edge piece 5 connected by means of upper contour 1 and lower contour 3 forming S-shaped center line 3. Maximum thickness C_Hmax of lower contour 2 is located at distance lesser than 0.7 of chord B_A from nose 4 of profile and lower contour 2 of trailing-edge piece 5 is convex at distance of (0,1...0,3)B_A from trailing-edge piece 5 at curvature radius of R_h.ed.low = (0,5...4,5)B_A.. Lower contour 2 of profile may have at least one rectilinear section; curvature radius R_h.ed.low of lower contour may be constant and varying (reducing towards trailing-edge piece 5). EFFECT: extended range of lift coefficients. 5 cl, 4 dwg