A floatation system for a marine vessel with a starboard pontoon, a port pontoon, and a center pontoon positioned therebetween. Outer strakes each extending along an outer length between forward and aft ends, each having an outer surface at an outer angle from a horizontal plane and an inner surface at an inner angle from the horizontal plane, and each being coupled to one of the starboard pontoon and the port pontoon. Inner strakes each extending along an inner length between forward and aft ends, each having an outer surface at an outer angle from a horizontal plane and an inner surface at an inner angle from the horizontal plane, and each being coupled to the center pontoon. The outer angles of the inner strakes are greater than the outer angles of the outer strakes and the inner angles of the inner strakes are less than 90°.

A box shaped bilge keel comprises a convex polygonal shaped cross-section. Further, the box shaped bilge keel extends along a pre-determined length of a hull of a floating vessel. Also, the box shaped bilge keel is providing additional width to the hull at the bottom of the floating vessel.

A box shaped bilge keel comprises a convex polygonal shaped cross-section. Further, the box shaped bilge keel extends along a pre-determined length of a hull of a floating vessel. Also, the box shaped bilge keel is providing additional width to the hull at the bottom of the floating vessel.