Controlled WIG flight - stability and efficiency problems

The statement of the main problems of algorithms and technical means design for motion control at small altitude above the disturbed sea surface is given. The aim of investigation is to improve the functional characteristics of the advanced transport vehicles, particular, wing-in-ground effect craft or ekranoplanes. The physical phenomenon of jump in lift/drag ratio at special wing motion close to supporting surface is the base for WIG-craft construction. Methods of stability providing and other problems solving by means of automatic control are analyzed. The experience and achievements in this field of high technology are described.