A marine vessel hull, and marine vessels comprising at least one such hull, comprising a non-entrapment hull having at least one partial-beam, longitudinally vented transverse step, each partial-beam, longitudinally vented transverse step comprising a transverse step with port and starboard portions that do not continuously extend from port chine to starboard chine. In one embodiment, the port and starboard portions extend inwardly to an intersection with at least one longitudinal step but do not fully extend from starboard to port across the full beam of the vessel. In another, the port and starboard portions extend between longitudinal steps across the centerline but not to the starboard and port chines.

A marine vessel hull, and marine vessels comprising at least one such hull, comprising a non-entrapment hull having at least one partial-beam, longitudinally vented transverse step, each partial-beam, longitudinally vented transverse step comprising a transverse step with port and starboard portions that extend inwardly to an intersection with at least one longitudinal step but do not fully extend from starboard to port across the full beam of the vessel.

Provided is a hull of a boat including a central portion of a bottom of the hull, side portions of the bottom of the hull, lateral to the central portion of the bottom of the hull, the central portion of the bottom of the hull being substantially lowered in a substantially discontinuous way with respect to the side portions of the bottom of the hull, central side walls separating the central portion of the bottom of the hull from the side portions of the bottom of the hull. The hull also having external side walls laterally external to the side portions of the bottom of the hull.

This disclosure describes hybrid chine hulls, marine vessels including hybrid chine hulls and methods of manufacturing and using hybrid chine hulls. An exemplary hybrid chine hull includes a keel, a single chine section, and a double chine section distinct from the single chine section with respect to a longitudinal direction of the keel and positioned aft of the single chine section.

A watercraft includes a hull having inner and outer surfaces and at least one collapsible strake coupled to the hull. The collapsible strake includes a movable skin hingedly coupled to the hull. The collapsible strake also includes a dampening element and a negative stiffness element each extending from an inner surface of the movable skin to the outer surface of the hull. The movable skin is configured to rotate between an uncollapsed configuration having a first stiffness and a collapsed configuration having a second stiffness greater than the first stiffness.

The invention is a watercraft with at least one hull which creates hydrodynamic lift by using narrowing concave channels (1) on the underside of the said at least one hull where propulsion (3) is placed such that the said propulsion draws water through the said narrowing concave channels (1).

A pontoon boat includes port and starboard pontoons and cross members connecting the pontoons. A shock absorber may be installed at each point of connection of the pontoons to the cross members. A cross member may be embodied as a double-webbed beam having first and second parallel flanges and first and second webs disposed between and connected to the flanges. Each pontoon may include a two-stage lifting strake having a first surface and a second surface inclined from the first surface.

An apparatus comprising a board such as a surfboard or body board is disclosed. The board comprises a top deck and a bottom. The board comprises a forward end and a rear end. The distance between the forward end and the rear end defines a length of the board. The board further comprises rails provided at side of the board, which defines a width of the board. The rails are provided in a step-like structure to reduce thickness of the rails coming in contact with wave water wall. The board further comprises a cut-section provided at bottom along longitudinal axis of the board to reduce resistance against surface of the water when in motion. The board further comprises a set of fins provided at bottom near the rear end. Further, the board comprises at least one stringer at its center to strengthen the board, reduce deformation, and add stiffness to the board.

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.

Provided is a hull of a boat including a central portion of a bottom of the hull, side portions of the bottom of the hull, lateral to the central portion of the bottom of the hull, the central portion of the bottom of the hull being substantially lowered in a substantially discontinuous way with respect to the side portions of the bottom of the hull, central side walls separating the central portion of the bottom of the hull from the side portions of the bottom of the hull. The hull also having external side walls laterally external to the side portions of the bottom of the hull.