Abstract: A motor driven hydroplaning boat has a hull of symmetrical generally smooth surfaced configuration which converges towards an apex at a bow thereof and widens amidships to form a pair of laterally and downwardly extending wings. A forward bottom portion of the hull, from the bow to beneath the wings, forms a generally smooth surfaced concave downward tunnel. The wings smoothly narrow aft of amidships and become generally horizontal from amidships aft. A top of the hull is of a generally smooth minimal air resistance shape. A fore foil structure is mounted to extend downwardly from the fore tunnel. An aft foil structure is mounted to extend downwardly from an aft bottom portion of the hull. The overall boat has low air resistance yet overall high stability and can be turned relatively sharply.