An inflatable motor boat refers to water vehicles, in particular, to inflatable boats with outboard engines operating in low water conditions. The problem to which the invention is directed, is to improve the performance parameters of inflatable motor boats, The technical result of the claimed invention is the possibility of high-performance boating in low and extreme low depth conditions at different speeds due to the presence of the inclined longitudinal tunnel, with some configuring details in different versions, which allows to improve the water supply to the propellers of outboard engines or, in the case of water jet engines, to their water jet inlets, to optimize their location and eliminate the risk of damage thereof. The claimed technical result is achieved by the fact that the invention is an inflatable motor boat with a U-shaped hull in plan view. The hull of the inflatable motor boat is formed by open outline of inflatable boards and bow part. An inflatable bottom is attached to the hull, which bottom is divided into at least three longitudinal segments. A longitudinal tunnel is made in the middle segment of the bottom, the inner surface of which tunnel has essentially arc-shaped form. The tunnel comprises a portion having a wedge-shaped form in a vertical section, wherein the angle of inclination of the portion relative to the water surface plane is from 5 to 45. The tunnel can also comprise an additional portion with an angle of inclination from 0 to 20 relative to the water surface plane, wherein the length of the additional portion is less than the length of the wedge-shaped portion.

A watercraft suitable for fishing has a rotomolded deck and hull. The deck includes a cockpit with substantially vertical sidewalls, a rear wall, a pedaling installation, and a flat floor between the sidewalls extending from the rear wall to the pedaling installation in the cockpit. The hull includes a depression between lateral protrusions amidships and a stern with a rounded cross section so that the combination of the lateral protrusions and rounded stern cross section allow the watercraft to track straight on water and for the stern to move laterally when the watercraft is turned on a body of water. The watercraft may also include a seat movably mounted onto spaced apart grooves installed on the flat floor of the cockpit that extend from a rear position near the rear wall to a forward position near the pedaling installation.

A marine vessel hull, and marine vessels comprising at least one such hull, comprising a non-entrapment hull having at least one longitudinally vented transverse step, each longitudinally vented transverse step comprising a transverse step, and one or more longitudinal steps extending forward therefrom. Each longitudinal step portion has a cross-sectional profile defining a cutout into the hull relative to a line defined by a deadrise angle of the hull. The cutout defines a vertical rise starting from the line defined by the deadrise angle and a run tilted outwardly upward at a non-horizontal angle less than the deadrise angle and that extends to an intersection with the line defined by the deadrise angle.

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.

Disclosed is a boat with at least one combustion engine positioned on or symmetrical with the vertical median plane of the boat and two engines provided symmetrical with respect to the vertical median plane, each including a propeller in a duct with: a central section on which the propeller is positioned, a rear section leading via a rear opening onto the transom of the hull, a front section with a continuous curved profile, leading via a side opening to the outside wall of the hull, the side opening having a larger cross-section than the cross-section of the rear opening in order for the duct to include at least one converging nozzle, the front section being oriented so that the stream of water exiting from the side opening is directed towards the front and forms an angle of 20 to 60 with respect to the wall of the hull.

The invention relates to boat building and can be used in the building and modification of sea-going high-speed keeled monohull sailboats or sail and motor boats with a high sail power to weight ratio, where a single, narrow, wave-penetrating displacement hull is used. To provide for the stable controlled movement of a keeled monohull sailboat or sail and motor boat in wave penetration mode, i.e. in a low wave/hydrodynamic resistance displacement mode, both when heeling and when upright (at the same time effectively counteracting heeling and rocking on all courses), and to provide for the damping of the energy of a broken wave and also for the ability of the boat to self-right to an even keel from a sail-on-water position, a stabilized hull for a keeled monohull sailboat or sail and motor boat is configured with an overall width of not more than 50% of the length of the hull and has, in the bottom part thereof, a vertically oriented narrow section (4) of low wave/hydrodynamic resistance, which runs longitudinally along the full length of the boat, is symmetrical about the centreline thereof and has a displacement segment (5) comprising a keel (8) with a heavy bulb, wherein the displacement of the segment is equal to the full unladen weight of the boat. The hull further comprises two narrow longitudinally oriented sponsons (6 and 7), arranged symmetrically in relation to the centreline of the boat, which do not bear the weight of the boat and which have a streamlined shape of low wave/hydrodynamic resistance. Said sponsons are situated above the waterline at the maximum width of the hull, forming two tunnel cavities (10) above the waterline to dampen the energy of a wave broken by the bow and the sponsons.

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.

An inflatable boat with a motor mount for use in shallow water conditions. The inflatable boat with the motor mount has a U-shaped hull in plan view, which is formed by open outline of inflatable boards and nose, as well as a transom installed on the boat stern and an inflatable bottom attached to the hull from below, and which bottom has an axissymmetric groove laying longitudinally from the stern end. The groove is V-shaped in cross-section. The depth of the groove is reduced uniformly in direction to the bottom nose. The inflatable boat according to the present invention allows expansion of usage specifications of the inflatable boats with motor mount, provides an additional guard for the outboard motors installed on them against possible mechanical damages and lowers fuel consumption in comparison with the boats of similar design.

A boat with a foam material filled keel structure comprising: a buoyant body, which is a U-shaped tube; a bottom plate, set on the bottom of the buoyant body; a tail plate, set at the rear of the buoyant body and the bottom plate; and a keel structure, set on the bottom of the bottom plate; wherein the keel structure is downward depressed, hence a convex part on the bottom and a groove on the top are formed; wherein in the groove of the keel structure is filled with foam material, Thereby it is achieved that water seepage in the keel structure is avoided.