Surfboards moved by user power comprises: a surfboard body streamlined, when viewed from a plan view, concave grooves are formed on both sides, respectively; a propulsion body including: a first propulsion body formed with a first propulsion unit that is hinged to one side groove of the surfboard body and is formed inclined with respect to the surfboard body on a lower surface to generate propulsion force according to the movement of the user's feet; and a second propulsion body formed with a second propulsion unit that is hinged to the other side groove of the surfboard body and is formed inclined with respect to the surfboard body on a lower surface to generate propulsion force according to the movement of the user's feet; and a direction change unit including: a rotating shaft passing through the surfboard body; a handle disposed on an upper end of the surfboard body of the rotating shaft to rotate the rotating shaft; and a direction change key that is disposed on a lower part of the surfboard body of the rotating shaft and rotates together with the rotating shaft.

Surfboards moved by user power comprises: a surfboard body streamlined, when viewed from a plan view, concave grooves are formed on both sides, respectively; a propulsion body including: a first propulsion body formed with a first propulsion unit that is hinged to one side groove of the surfboard body and is formed inclined with respect to the surfboard body on a lower surface to generate propulsion force according to the movement of the user's feet; and a second propulsion body formed with a second propulsion unit that is hinged to the other side groove of the surfboard body and is formed inclined with respect to the surfboard body on a lower surface to generate propulsion force according to the movement of the user's feet; and a direction change unit including: a rotating shaft passing through the surfboard body; a handle disposed on an upper end of the surfboard body of the rotating shaft to rotate the rotating shaft; and a direction change key that is disposed on a lower part of the surfboard body of the rotating shaft and rotates together with the rotating shaft.

The present invention provides devices and kits for modifying a standard surfboard into a motorized surfboard, utilizing a detachable modular underwater power unit, wherein said underwater power unit is configured to be attached to various standard fins or a fin unit, and wherein the underwater power unit is further configured be utilized for diving and/or swimming applications.

The present invention provides devices and kits for modifying a standard surfboard into a motorized surfboard, utilizing a detachable modular underwater power unit, wherein said underwater power unit is configured to be attached to various standard fins or a fin unit, and wherein the underwater power unit is further configured be utilized for diving and/or swimming applications.

A hydrofoil watercraft, in particular, a hydrofoil board is described herein. The hydrofoil board may comprise one or more of a body, a hydrofoil assembly, and/or other components. The body may have one or more of a deck surface configured to support a rider, a bottom surface opposite the deck surface, and/or other surfaces and/or features. The body may comprise a fore portion having a planing surface forming part of the bottom surface. The body may have an aft portion having an aft bottom surface forming part of the bottom surface. The fore portion may be toward a front end of the board. The aft portion may be toward a rear end of the board. An aft cross-sectional thickness between the deck surface and the aft bottom surface may be less than a fore cross-sectional thickness between the deck surface and the planing surface.

A pump intake adapter for pumping shallow levels of fluid from a surface to be drained, the pump intake adapter including a connection on the pump intake adapter to convey the fluid away from the pump intake adapter; an intake surface on the pump intake adapter; and a portion of the intake surface of the pump intake adapter that in operation does not contact the surface to be drained, and creates an open conduit between the pump intake adapter and the surface to be drained through which fluid may flow, the open conduit being in fluid communication with the connection on the pump intake adapter. Other systems and methods are provided.

A pump intake adapter for pumping shallow levels of fluid from a surface to be drained, the pump intake adapter including a connection on the pump intake adapter to convey the fluid away from the pump intake adapter; an intake surface on the pump intake adapter; and a portion of the intake surface of the pump intake adapter that in operation does not contact the surface to be drained, and creates an open conduit between the pump intake adapter and the surface to be drained through which fluid may flow, the open conduit being in fluid communication with the connection on the pump intake adapter. Other systems and methods are provided.

A self-propelled hydrofoil surfboard includes a surfboard having a mast mounted to the lower surface of the surfboard, a selectively controllable thruster mounted at a lower end of the mast, a controller and a battery to supply power to the controller and thruster, the controller cooperating with a remote controller adapted to give control inputs to the controller and to be carried when in use by a rider, navigation lights mounted around at least a portion of the circumferential edge of the surfboard, and wherein the mast may have an adjustable length.

A self-propelled hydrofoil surfboard includes a surfboard having a mast mounted to the lower surface of the surfboard, a selectively controllable thruster mounted at a lower end of the mast, a controller and a battery to supply power to the controller and thruster, the controller cooperating with a remote controller adapted to give control inputs to the controller and to be carried when in use by a rider, navigation lights mounted around at least a portion of the circumferential edge of the surfboard, and wherein the mast may have an adjustable length.

A device for attachment to a rideable object upon a water surface, such as, but not limited to a paddleboard, to provide a grasping surface and foothold to aid in righting and boarding the rideable object. The device is configured for universal use, wherein it is adjustable for multiple sizes and types of rideable objects or paddleboards. The device is comprised of a connecting portion having a first end and a second end opposed the first end. The connecting portion includes a selectable position and attachment means to enable fixing the device to the rideable object. A second end of the device includes a loop member configured to dangle below the rideable object to provide a foothold for boarding and righting the object.