Patent ID: 8196537

Claim:
A tandem or canard type WIG craft using the ground effect, comprising; a propeller equipped body; a buoyant front wing configured for planing on water surface and having an aspect ratio of less than 5 , said front wing installed in the lowest section of the fore half of the body; and a buoyant rear wing having longer span and shorter chord length than the front wing, said rear wing installed in the lowest section of a rear half of the body at an angle of incidence so that the lift coefficient of the rear wing is equal to or larger than that of the front wing without the ground effect, wherein the center of gravity of the craft is positioned at a trailing edge of the front wing as seen in the top plan view, and wherein the front wing is used for planing on the water surface when the craft takes off from and lands on the water, and floats on water with the front and the rear wings while the craft is at rest.