A built-in water pumping device of a manual paddle for a boat contains: a shaft, a blade, and a water absorption head. The shaft includes an inner tube and an outer tube movably fitted with the inner tube so as to movably adjust a length of the shaft, thus pumping waters. An adjustable fitting sleeve is configured to lock or unlock the inner tube and the outer tube after adjusting the length of the shaft. The shaft includes a receiving chamber. A water absorption head is fixed on the outer tube and has a passing orifice. The blade includes at least one outlet communicating with the receiving chamber, such that the inner tube is actuated to absorb the waters into the receiving chamber from the passing orifice, and the inner tube is pulled back and forth so that the waters discharge out of the at least one outlet continuously.

Wakeboat fluid housing compartment fluid level sensing assemblies are provided. The assemblies can include: a wakeboat having a hull; a fluid housing compartment associated with the hull; a nonconductive sensor chamber positioned within the fluid housing compartment of the hull; and at least a pair of conductive electrodes associated with the sensor chamber, at least one of the pair of conductive electrodes being positioned within the nonconductive sensor chamber and electrically isolated from fluid within the fluid housing compartment. Methods for sensing a fluid level within a fluid housing compartment aboard a wakeboat are also provided. The methods can include: maintaining fluid communication between the fluid level within the fluid housing compartment and a sensor chamber; and determining the electrical communication between at least a pair of electrodes operatively associated with the sensor chamber.

A field configurable autonomous vehicle includes modular elements and attachable components. The vehicle can be assembled from these modular elements and components to meet desired mission and performance characteristics without the need to purchase specially designed vehicles for each mission. The vehicle can include a mechanisms that magnetically attach and release payloads such as cargo or ballast from the vehicle.

A field configurable autonomous vehicle includes modular elements and attachable components. The vehicle can be assembled from these modular elements and components to meet desired mission and performance characteristics without the need to purchase specially designed vehicles for each mission. The vehicle can include a mechanisms that magnetically attach and release payloads such as cargo or ballast from the vehicle.

An adjustable surf wake system enhances a wake formed by a watercraft travelling through water. The system may include a flap for deflecting water traveling past the stern of the watercraft, and/or a positioner operably connected to the flap for positioning the flap relative to a longitudinal axis of the watercraft between a neutral position and an outward position. Positioning a port flap in its extended position enhances a starboard surf wake, and positioning the starboard flap in its extended position enhances a port surf wake. A wake modifying system for modifying a wake produced by a watercraft traveling through water may include a rudder pivotally mounted to the watercraft for steering the watercraft, a fin pivotally mounted to the watercraft substantially along a centerline of the watercraft and forward the rudder, wherein the fin pivots about an upright axis to modify the wake produced by the watercraft traveling through the water, an actuator mounted within the watercraft and operably coupled to the fin for pivoting the fin relative to the centerline, and a controller mounted on the watercraft allowing an operator to control the actuator and selectively pivot the fin to a desired angle θd relative to the centerline.

An adjustable surf wake system enhances a wake formed by a watercraft travelling through water. The system may include a flap for deflecting water traveling past the stern of the watercraft, and/or a positioner operably connected to the flap for positioning the flap relative to a longitudinal axis of the watercraft between a neutral position and an outward position. Positioning a port flap in its extended position enhances a starboard surf wake, and positioning the starboard flap in its extended position enhances a port surf wake. A wake modifying system for modifying a wake produced by a watercraft traveling through water may include a rudder pivotally mounted to the watercraft for steering the watercraft, a fin pivotally mounted to the watercraft substantially along a centerline of the watercraft and forward the rudder, wherein the fin pivots about an upright axis to modify the wake produced by the watercraft traveling through the water, an actuator mounted within the watercraft and operably coupled to the fin for pivoting the fin relative to the centerline, and a controller mounted on the watercraft allowing an operator to control the actuator and selectively pivot the fin to a desired angle θd relative to the centerline.

A system and method allows boats to operate air conditioners while positioned above the water level. A dock-mounted control unit has an inlet for lake or seawater, an inlet for fresh water, and an outlet to the raised boat. The fresh water is temporarily used to prime the system, after which the boat's A/C system can operate normally. After the system is primed, a valve on the control unit is used to close off the fresh water inlet, and the fresh water hose may be removed. A Y-valve (or two 1-way valves) provides two settings, one for ordinary, on-water operation, and the other for use in conjunction with the invention. The invention allows the boat's AC system to function as though it were in the water, allowing normal heat exchange with the body of water and thus, normal A/C while on a lift or hoist.

The present invention refers to a hybrid vessel with a ballast system in which the position of the cabin (102) is changed vertically, from emerged to submerged and vice versa, according to the decision of its operator. Thus, the present invention describes a hybrid vessel with ballast water system comprising at least one cabin (102) and at least one main tank (101) of ballast water, and the tank (101) is connected directly to the CAB (102) or partially above the water level.

The present invention refers to a hybrid vessel with a ballast system in which the position of the cabin (102) is changed vertically, from emerged to submerged and vice versa, according to the decision of its operator. Thus, the present invention describes a hybrid vessel with ballast water system comprising at least one cabin (102) and at least one main tank (101) of ballast water, and the tank (101) is connected directly to the CAB (102) or partially above the water level.

An example watercraft includes a hull that defines a cockpit. A scupper is provided that extends from the cockpit through an exterior surface of the hull. A recess defined by the hull is in communication with the scupper, and the recess defines a portion of a venturi tube. A plate that is attachable to the hull is configured to define another portion of the venturi tube such that when the plate is attached to the hull, a complete venturi tube is defined.