Watercraft hulls and parts thereof are disclosed which improve hydrodynamic performance for yachts, sailboards, and other craft. Drag at the transition from displacement mode to planing mode may be reduced to be the same or less than the minimum drag experienced in planing mode. Exemplary embodiments may include a bow with a center planing surface and tunnels to either side. The bow tunnels may each end in a step. At least part of the center planing surface may be cambered. A spoiler and/or interceptor may be provided at an aft end of a camber of a planing surface. For some hulls, the bow is followed by a main lift surface which is followed by a back lift surface (from stem to stern). In the back lift surface behind the main lift surface, a tunnel surface may be provided to add longitudinal stability.
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