A catamaran which has a centre tunnel, the opposite sides (105a, 105b) of which form asymmetrical pontoons, which are mirror images of each other, and which pontoons have buoyancy, which has been adapted so that when the catamaran moves in water, the centre tunnel functions as a combined water and air tunnel. When the catamaran is stationary in water, the ceiling (108) of the centre tunnel is in water. The ceiling of the centre tunnel further curves in a cylindrically convex manner downwards when going from the bow (116) to the direction of the stern (118) only after an essentially horizontal portion (401) of a distance (d), which essentially horizontal portion is located between the pontoons.

A watercraft has an unsealed hull that is permeable such that, in use, water flows at least partly into an internal volume of the hull. The hull has at least one hull panel having inner and outer panel surfaces. At least one buoyant element is disposed within the internal volume of the hull. A conduit extends within the internal volume of the hull and defines at least one outlet for discharging water therethrough. An inlet connector of the conduit is configured to be connected to an external water source in order to supply water to the conduit. In response to the external water source being connected to the inlet connector, water flows through the conduit, out of the at least one outlet of the conduit, and onto at least a portion of at least one of the inner panel surface and the at least one buoyant element for rinsing thereof.

An unmanned vehicle including a vehicle body, a propulsion system, a maneuvering system, a vehicle control system, a buoyancy control system, a sensor system, and at least one power supply is disclosed. The propulsion system, maneuvering system, vehicle control system, buoyancy control system, sensor system, and power supply are carried by the vehicle body. The sensor system includes a sensor adapted to detect an item of interest and provide an item of interest signal to the vehicle control system. The vehicle control system is adapted to receive the item of interest signal, identify an item of interest classification and provide a classification signal. The classification signal is determined by the item of interest classification and is utilized by the propulsion system, maneuvering system, vehicle control system, or buoyancy control system to avoid physical, electrical, acoustic, or thermal detection of the unmanned vehicle by the item of interest.

A motorized watercraft may include an elongated hull extending along a longitudinal central axis (L) and a propulsion system. The propulsion system may include a drive module. The drive module may be mounted to the elongated hull. The drive module may include a motor and a propelling member. The motor may be in driving connection with the propelling member. A bottom surface of the elongated hull may be provided with a first channel and a second channel that respectively extend along the elongated hull on each side of the longitudinal central axis (L).

An unmanned vehicle including a vehicle body, propulsion system, maneuvering system, vehicle control system, rack, sensor, and a power supply. The vehicle control may be used to control the unmanned vehicle in combination with the propulsion and the maneuvering system. The rack may include a retractable mount that may move between a down position and an up position. The sensor system may include a plurality of transient object detection sensors. The plurality of transient object detection sensors may include a sensor adapted to detect an item of interest and may provide an item of interest signal to the vehicle control system. The vehicle control system may identify an item of interest classification and may provide a classification signal. The classification signal may be determined by the item of interest classification and may be utilized to avoid detection of the unmanned vehicle by the item of interest.

A passive generator system for a marine vessel using an intake manifold having an opening at the bottom of the hull of the vessel. The intake manifold tapers to a point at the rear of the opening and extends upward to an intake funnel that reduces down to a conduit. The conduit has a first portion angled relative to the opening which joins to a second portion at an elbow. The second portion of the conduit extends horizontally to a rear of the vessel, to a conduit exit where water can exit the conduit. An impeller is location in the first portion of the conduit that drives a generator through a shaft between the impeller and the generator, the shaft passing through a top of the first portion of the conduit.

The invention relates to a kayak comprising a light and stylish hull with a propeller mounted on the underside thereof, said propeller being actuatable by means of pedals mounted in front of and above a seat, the pedals and propeller being connected by means of a transmission that passes through the inside of the hull and below the surface thereof. Two rudders are arranged at the rear.

The present invention provides, with reference to FIG. 2, an amphibian operable in land and marine modes, the amphibian comprising a hull, at least one discontinuity (wheel bay) provided in the hull, and at least one retractable wheel or track assembly at least partially located in the at least one discontinuity (wheel bay). The hull is a planing hull, and the at least one discontinuity (wheel bay) is provided in the front half of the hull of the amphibian. The amphibian further comprises at least one conduit which opens, or is provided with an entry which opens, into or at the at least one discontinuity (wheel bay) and is configured for channelling, in use, fluid away from the at least one discontinuity (wheel bay).

Systems and associated methods for rapid integration and control of payloads carded by a multi-mode, unmanned vehicle configured to accommodate a variety of payloads of varying size, shape, and interface and control characteristics. Mechanical, power, signal, and logical interfaces to a variety of payloads operate to enable environmental protection, efficient placement and connection to the vehicle, and control of those payloads in multiple environmental modes as well as operational modes (including in air, on the surface of water surface, and underwater).

A personal watercraft hull has a bow, a keel, starboard and port upper edges, a starboard portion extending between the keel and the starboard upper edge, a port portion extending between the keel and the starboard upper edge, and a transom. The starboard portion has a starboard row of grooves. The port portion has a port row of grooves. The rows of grooves extend in a longitudinal direction and are laterally offset from the longitudinal centerline and from their corresponding upper edge. The grooves of the rows of grooves define recesses in an outer surface of the hull. A personal watercraft having the personal watercraft hull is also disclosed.