Question

Why the reverse delta wing is used for wig vehiclwes?

Answer 1

Answer:

A ground-effect vehicle (GEV), also called a wing-in-ground-effect (WIG), ground-effect craft, wingship or in Russian: ekranoplan, is a vehicle that is designed to attain sustained flight over a level surface (usually over the sea) by making use of ground effect, the aerodynamic interaction between the wings and the surface. The type is typically intended to operate from water like a flying boat, but some can operate over any flat area such as frozen lakes or flat plains similar to a hovercraft.