A floatation system for a marine vessel having a deck. The floatation system includes three pontoons each having a cylindrical portion extending between forward and aft ends. The three pontoons include a starboard pontoon, a port pontoon, and a center pontoon positioned therebetween. Support members are coupled to the deck and to the three pontoons such that the three pontoons are interposed. Outer strakes each having a tip and an elongated portion, the elongated portions each extending along an outer length between forward and aft ends, are each coupled to one of the starboard pontoon and the port pontoon. Inner strakes each having a tip and an elongated portion, the elongated portions each extending along an inner length between forward and aft ends, are each coupled to the center pontoon. The aft ends of the outer strakes are aft of the aft ends of the inner strakes.

A floatation system for a marine vessel having a deck. The floatation system includes three pontoons each having a cylindrical portion extending between forward and aft ends. The three pontoons include a starboard pontoon, a port pontoon, and a center pontoon positioned therebetween. Support members are coupled to the deck and to the three pontoons such that the three pontoons are interposed. Outer strakes each having a tip and an elongated portion, the elongated portions each extending along an outer length between forward and aft ends, are each coupled to one of the starboard pontoon and the port pontoon. Inner strakes each having a tip and an elongated portion, the elongated portions each extending along an inner length between forward and aft ends, are each coupled to the center pontoon. The aft ends of the outer strakes are aft of the aft ends of the inner strakes.

A boat includes a planing hull, a propeller, a main rudder, and a pair of flanking rudders. The planing hull has port and starboard sides, a transom, a hull bottom, and a centerline running down the middle of the boat, halfway between the port and starboard sides. The propeller is positioned forward of the transom and beneath the hull bottom. The main rudder is positioned aft of the propeller. The main rudder has a rotation axis about which the main rudder rotates. The flanking rudders are positioned forward of the propeller. One of the flanking rudders is positioned on the port side of the centerline, and the other flanking rudder is positioned on the starboard side of the centerline.

A boat includes a planing hull, a propeller, a main rudder, and a pair of flanking rudders. The planing hull has port and starboard sides, a transom, a hull bottom, and a centerline running down the middle of the boat, halfway between the port and starboard sides. The propeller is positioned forward of the transom and beneath the hull bottom. The main rudder is positioned aft of the propeller. The main rudder has a rotation axis about which the main rudder rotates. The flanking rudders are positioned forward of the propeller. One of the flanking rudders is positioned on the port side of the centerline, and the other flanking rudder is positioned on the starboard side of the centerline.

The vessels weight is wholly or partially supported by one or more fully or partially submerged hydrofoil(s). The amount of lift provided by said hydrofoil(s) is regulated as a function of that lift itself. External variables such as trim angle and vessel velocity affect total lift, and this system compensates for those variables to provide a regulated lift without the need to directly sense any of the external variables. A typical control system comprises one or more sensory inputs, a method to translate the input into a control output, and an actuator that turns the outputs into actual movements. The only sensory input for this system is the same lifting force that is being regulated. The mechanical arrangement translates that lifting force into movements that produce negative feedback by varying the angle of attack of the hydrofoil, which in turn regulates the lift produced.

A planing boat including: a hull having a boarding area; a screw unit having a screw, and configured to be rotatable with respect to the hull so that the expulsion direction of a water current by the screw can vary by 360 degrees; and a direction change mechanism having a turning drive force source, and configured to change the expulsion direction by rotating the screw unit with respect to the hull with a drive force of the turning drive force source.

A planing boat including: a hull having a boarding area; a screw unit having a screw, and configured to be rotatable with respect to the hull so that the expulsion direction of a water current by the screw can vary by 360 degrees; and a direction change mechanism having a turning drive force source, and configured to change the expulsion direction by rotating the screw unit with respect to the hull with a drive force of the turning drive force source.

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.

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.

A method of planing a marine vessel propelled by an electric propulsion system operably connected to a rotatable propeller system including that a command input requesting an increase in throttle is received. The method also includes that it is determined whether the marine vessel is on plane and whether there is sufficient power and energy available in the electric propulsion system to reach planing speed when the marine vessel is not on plane. The method further includes that power output from the electric propulsion system is increased for a selected period of time such that the electric propulsion system is allowed to overshoot continuous power limits of one or more components of the electric propulsion system for the selected amount of time. The one or more components of the electric propulsion system including at least one of an electric motor, an energy storage device, and an electric controller.