A modular hydrofoil watercraft may include a plurality of modules which are releasably connectable to each other to when assembled form the modular hydrofoil watercraft. The modular hydrofoil watercraft when assembled may include a hull extending along a longitudinal center axis, a propulsion system that has a motor and a propelling member, a mast that extends downwardly from the hull and a hydrofoil connected to the mast.

A multihull sailing vessel includes at least two buoyant hulls extending along their longitudinal axes, with the hulls being connected to each other and a first hydrofoil connected to the hulls and oriented transverse to the hulls. The first hydrofoil is movably coupled to the hulls between a first position above a resting waterline of the hulls and a second position below a lowest extent of the hulls. When the first hydrofoil is in the second position, a configuration of the first hydrofoil is adjustable to vary an amount of lifting force generated by the first hydrofoil when the hulls move forward through water when the first hydrofoil is in the second position.

Hull with variable geometry for a vessel (11), comprising a completely immersed part (12), configured to provide part of the buoyancy thrust and integral with an emerged part (13) of the hull by means of one or more uprights (14), and one or more immersed wing surfaces (15) which, in a situation in which the vessel travels at a sufficiently high speed, are configured to provide the remaining part of the vertical thrust required to keep the vessel (11) above the surface of the water at a predetermined height; the hull comprises one or more supports (16a, 16b, 16c) connected to the wing surfaces (15) and associated with floating elements (17a, 17b, 17c) which are mobile with respect to the completely immersed part (12); the floating elements (17a, 17b, 17c) are fixed to the supports (16a, 16b, 16c) or mobile with respect to the supports (16a, 16b, 16c), therefore the floating elements (17a, 17b, 17c) are substantially cooperating with the completely immersed part (12) and with the wing surfaces (15); the wing surfaces (15) are configured to move with respect to the completely immersed part (12) or to remain fixed with respect thereto and the floating elements (17a, 17b, 17c) are configured to increase their immersion as the speed of the vessel decreases, and therefore provide the vertical thrust to maintain or adjust the distance of the vessel from the water in a manner that is optimal and functional for the use of the vessel, even at reduced speeds or when the vessel is stationary.

A personal watercraft comprising a body having a seat and a hull, the seat configured to support a user with the body floating in water, a plurality of hydrofoils extending outwards from the body and coupled to a positioning system, the plurality of hydrofoils being configured, in combination, to raise the hull of the personal watercraft above a waterline in the water when the personal watercraft is in use and under the influence of a propulsion force, one or more sensors that provide sensor data of the watercraft during use, a computer-readable medium having a processor and a memory having instructions that, when executed by the processor read the sensor data, and based on the read sensor data, send a signal to the positioning system to adjust the position for at least one of the plurality of hydrofoils.

A hydrofoil system provides lift to a motor-powered displacement hull without raising the hull out of the water. The hydrofoil system includes a pair of laterally opposed forward hydrofoil wings positioned respectively on the first pontoon and second pontoon forward a center of gravity of the hull. The forward hydrofoil wings extend laterally inboard and downwards towards each other. The hydrofoil system also includes a pair of laterally opposed aft hydrofoil wings positioned near the stern of the hull on the first pontoon and second pontoon respectively. The aft hydrofoil wings extend laterally inboard towards each other and have an upper surface with convex curvature that extends from the respective first pontoon or second pontoon to an inboard terminal end thereof.

A watercraft and a waterproof electronics container are provided. The watercraft includes a flotation portion. A strut is removably affixed to a portion of the watercraft. A first connector portion is mounted to the upper end of the strut. A waterproof electronics container includes a second connector portion is disposed such that the second connector forms at least one electrically conductive pathway with the first connector portion when both are affixed to the watercraft. The waterproof electronics container is removably affixed to the said watercraft. In one aspect, the waterproof electronics container houses a power source capable of powering an electric motor that propels the watercraft.

A flexible coupling mechanism may be used to suspend a structural component, such as a propulsion pod, from a support member, such as a strut of a hydrofoil watercraft. The flexible coupling mechanism may include multiple vibration isolating mounts configured to extend through the support member to suspend the structural component. The vibration isolating mounts may include a plurality of elastomeric bushings configured to prevent direct contact between a component rigidly coupled to the support member and a component rigidly coupled to the structural component. The elastomeric bushings may include a tapered outer profile configured to provide a nonlinear force feedback profile in response to rotation of the support member relative to the structural component.

A foil displacement system includes one or more foils that can be deployed and stowed. When deployed, each foil can exert downforce or uplift depending on its orientation. For example, each foil may be positioned to have an angle of attack that creates a downward force effectively transmitted to the hull to pull the hull deeper within the water to, for example, create a larger wake. Use of the foil displacement system can enhance or replace the use of a ballast tank system, can be integrated into a new boat or retrofitted to existing boats, can be electronically or manually positioned, can enhance activities such as wake surfing, wake boarding, water skiing or other similar or related water sports.

A hydrofoil craft includes a hull including a bottom that spreads from a bow to a stern; and a hydrofoil mechanism provided on the bow side of the hull. The hull further includes an accommodating recess formed therein, and the accommodating recess is recessed toward the stern side between the bow and the bottom to accommodate the hydrofoil mechanism. A retreat surface is formed between the bottom and a recess main surface facing the bow side in the accommodating recess, and the retreat surface extends toward the stern side in a downward direction and is connected to the bottom.

A hydrofoil (1) includes a mast (2), with an incoming flow edge (3), a discharge edge (4), lateral surfaces (5) and an upper mast end (6) with a holder (7) to be fastened to a watersports board. A fuselage (8) has front (10) and rear wings (11) are arranged on opposite sides. The mast and the fuselage are configured as separate components and are connected to one another via a screw connection (12). An adapter (13) is connected to the mast and to the fuselage and is arranged in a recess (14) of the fuselage. A positive locking is established between an adapter outer surface (15) and the recess of the fuselage. An adapter mount (16) receives a lower mast end (9). A positive locking is formed between the mast and the adapter such that the lower mast end is arranged within the fuselage.