WING-IN-GROUND EFFECT CRAFT Russian patent published in 2004 - IPC

FIELD: air-cushion craft. SUBSTANCE: invention relates to vehicles on dynamic air cushion and namely to wing-in ground effect crafts with alighting gear for take off and landing on water surface. Proposed craft has underwater part in form of keel body with variable dead rise in length with rise of floor angle of 40-70^o in bow and rise of floor angle of 10-20^o at a distance of 0.5-0.75L from fore perpendicular. Underwater part is provided with first planing step at a distance of 0.01-0.05 to bow from point of intersection of intersection of line of middle of aerodynamic chords of wing with diametric plane. Hydro-ski is arranged in middle part of hull with width in plan of b = 0,25-0,6B_b (B_b is breadth of hull over bilge) and length 1=0.05-0.08L (L is theoretical length), hinge-secured in bow part to rigid members of bull. Cylinders-shock absorbers are arranged at a distance of 0.6- 0.71 from joint to extend and retract ski in to lower position to angle of 30-50^o and into upper position so that lower surface of ski should be flush with hull lines in this area. Shock absorbing properties provide natural frequency of "hydro-ski-cylinder-shock absorber" system differing by 15- 20% to any side from 1-tube frequency of elastic vibrations of wing-in -ground effect craft. Several shock absorbers are arranged on upper surface of hydro-ski which, in compressed position thrust against support platform rigidly secured on rigid braces of hull. Summary rigidity of all shock absorbers is such that frequency of "hydro-ski-shock absorber" system exceeds frequency of third tone of elastic vibrations of hull ν_h-s>1,2_IIIv by not less than 20%. Second planning step is located at a distance of 0.65-0.75L having height H=0.15-0.25B_b and width over full width of full width of hull is said area, being made as part of hull structure. 3-4 planing steps are made on lower surface of end plates of wing at approximately equal distances in length of end plate and having height of 0.8-1.2 of end plate width. EFFECT: provision of automatic safe landing, short landing run, reduced value and number of impacts at landing. 4 cl, 4 dwg