Maritime drone (1) comprising a hull (2) provided with an upper face (3) and a lower face (4), a centerboard (5) extending projecting from the lower face (4) of the hull (2) in order to give sailing/navigation stability to the maritime drone (1) and at least one wing sail (6). The wing sail (6) comprises a mast (7) connected to the hull (2) and a wing profile (8) connected to the mast (7) and it is suitable to intercept the wind in order to move the maritime drone (1). The centerboard (5) internally defines a containment volume (9) for the wing sail (6), which is movable between an operative position, in which it extends at least partially above the upper face (3) of the hull (2), and an inoperative position, in which it is at least partially housed in the containment volume (9) of the centerboard (5).

A cooling system for a boat includes at least one cooler located inside a hull of the boat and closed to the exterior of the hull. The cooler is configured for the exchange of thermal energy between a flow of coolant in the at least one cooler and a fluid flow outside of the hull via a hull wall positioned between the flow of coolant and the fluid flow. One or more coolant passages extend from the at least one cooler defining at least one coolant loop. The one or more coolant passages are configured to deliver the flow of coolant from the at least one cooler to one or more components located along the at least one coolant loop to cool the one or more components, and return the flow of coolant to the at least one cooler.

A cooling system for a boat includes at least one cooler located inside a hull of the boat and closed to the exterior of the hull. The cooler is configured for the exchange of thermal energy between a flow of coolant in the at least one cooler and a fluid flow outside of the hull via a hull wall positioned between the flow of coolant and the fluid flow. One or more coolant passages extend from the at least one cooler defining at least one coolant loop. The one or more coolant passages are configured to deliver the flow of coolant from the at least one cooler to one or more components located along the at least one coolant loop to cool the one or more components, and return the flow of coolant to the at least one cooler.

This invention provides a water craft hull having an air chamber, wherein the sidewalls of the air chamber extend lower than the fore wall and the aft wall of the air chamber, and wherein the hull comprises at least one air injector configured to deliver pressurized air to the air chamber. Optionally, a hull of the invention has a high aspect ratio air chamber defined by a stable fore wall, a stable aft wall, and stable sidewalls, is a non-planing hull, has a wave-piercing bow, and has elongated keel fins (e.g. inner keel fins and/or outer keel fins). Optionally, the air chamber is configured for recirculating air flow.

A boat hull (1) for a boat, with a boat drive (2) which extends through a hull opening (3) in the bottom of the boat hull (1). The boat drive (2) is connected to the boat hull (1) by at least one fastening member (4). To do this, at least one positioning element (5) is provided, on the outside (6) of the boat hull (1), for positioning the fastening member (4) relative to the boat hull (1).