Abstract: A seaplane hull which in one embodiment has a high length to beam ration, substantially fair topside waterlines from bow to stern and a fine bow entry angle is disclosed. These characteristics minimize dispersement of the water, offering the low wave-making drag characteristics which enable high speeds without requiring planing lift. Chines on the underside describe a slim planing surface where edges converge aft toward a central plane. The slim planing surface minimizes wetted area at speed, and low pressure hollows, provided immediately above the chines, allow for air to travel aft and under an afterbody when at speed. The design enables continuity of aerodynamic and hydrodynamic streamlines throughout acceleration to take-off speed.