Structure of surface effect ship with side walls

A surface effect ship including a catamaran-type supported structure with two side hulls connected by a central box structure, able to operate either as displacement vehicle or as an air cushion lifted vehicle, wherein said ship comprises:

• a plurality of continuous longitudinal stiffeners with said sidewalls for bearing longitudinal bending stresses;
• continuous transverse framing within said central box structure connecting said side hulls thereto and built-in within said hulls for bearing transverse bending stresses;
• and
• at least one stiffened transverse bulkhead located toward the bow and at least one stiffened transverse bulkhead located toward the stern of said ship, respectively, to bear transverse bending stresses applied on the stern and the bow of said ship resulting from diagonal twist moments on said ship, each said bulkhead comprising a transverse beam-like structure within said central box structure, said beam like structure comprising a vertical web portion strengthened within said central box structure by upper and lower horizontal flanges, said web portion extending continuously down within said hulls, each said bulkhead longitudinally subdividing the hulls and said central box structure of said ship and providing structural integrity thereto.