Abstract: A watercraft includes a deck, a pontoon assembly, and a propulsion system. The pontoon assembly supports the deck, and includes a supporting structure connected to the deck, a center pontoon, a port pontoon and a starboard pontoon. The center pontoon is connected to the deck by the supporting structure. The port and starboard pontoons are connected to the deck, and are disposed to left and right of the center pontoon respectively. The propulsion system includes a battery, an electric motor and a propulsion unit. The battery is mounted on the supporting structure, and is disposed vertically between a lower surface of the deck and an upper surface of the center pontoon. The electric motor is electrically connected to and powered by the battery and is supported by at least one of the pontoon assembly or the deck. The propulsion unit is operatively connected to the electric motor.

Abstract: A pontoon assembly includes center, port and starboard pontoons, a port lift member, which is connected to and extends laterally between the center and port pontoons, and a starboard lift member, which is connected to and extends laterally between the center and starboard pontoons. The port and starboard lift members are positioned vertically below a vertical midpoint of the center pontoon, and are configured to provide lift to the pontoon assembly as it moves forward in the body of water. A port channel, which extends over the port lift member, is defined by the center and port pontoons, and the port lift member. A starboard channel, which extends over the starboard lift member, is defined by the center and starboard pontoons and the starboard lift member. The port and starboard channels are at least partially filled with water with the pontoon assembly at rest on a body of water.

Abstract: A watercraft includes a deck, a pontoon assembly supporting the deck, and a propulsion system supported by at least one of the pontoon assembly and the deck. The pontoon assembly includes a center, port and starboard pontoons, all of which are connected to the deck. The port pontoon is disposed to a left of the center pontoon. The starboard pontoon is disposed to a right of the center pontoon. The propulsion system includes a battery disposed vertically between a lower surface of the deck and an upper surface of the center pontoon. Also, a pontoon assembly, which is for a watercraft, includes a center pontoon, a port pontoon disposed to a left of the center pontoon, and a starboard pontoon disposed to a right of the center pontoon. A highest point of the center pontoon is vertically lower than vertical midpoints of the port and starboard pontoons.

Abstract: A watercraft including a hull; a deck; a battery and an electric motor; a cooling system including: a heat exchanger; a closed cooling path in thermal contact with the heat exchanger and the battery; and an open cooling path in thermal contact with a portion of the closed cooling path. Also a cooling system including: a heat exchanger including: a heat exchanger body, a first channel defined in the heat exchanger body, the first channel being in thermal contact with the outer surface for conducting heat therebetween, and a second channel defined in the heat exchanger body, the second channel being in thermal contact with the first channel, a first cooling path in thermal contact with the battery, a portion of the first cooling path being defined by the first channel; and a second cooling path defined by the second channel.

Abstract: A watercraft including a hull including a bottom surface, a channel being defined by the bottom surface; a deck disposed above the hull; a battery disposed in a rear portion of the watercraft below the deck; an electric motor disposed in a forward portion of the watercraft, the electric motor being disposed above the bottom surface of the hull and below the deck, the electric motor being electrically connected to the battery; a propulsion shaft operatively connected to the electric motor at a front end of the propulsion shaft, the propulsion shaft extending downward and rearward from the electric motor, the propulsion shafting passing through the bottom surface of the hull and extending into the channel; a propeller connected to a rear end portion of the propulsion shaft; and a rudder pivotally connected to at least one of the hull and the deck.

Abstract: A method for replacing a battery and a watercraft including a hull; a deck; an electric propulsion system including: a battery disposed in a rear portion of the watercraft, and an electric motor electrically connected the battery; an opening defined at least in part by at least one of the hull and the deck, the opening providing access to a space between the hull and the deck, the opening being sized to permit the passage of the battery therethrough; and a rear module selectively connected to at least one of the hull and the deck, the rear module selectively closing the opening, the rear module, the battery, the deck, and the hull being arranged such that the battery is selectively removable through the opening when the rear module is removed from the watercraft.

Abstract: A watercraft and a marine engine assembly for mounting to a watercraft are disclosed. The marine engine assembly includes an engine unit including: an engine unit housing being sealed such that water in which the engine unit housing is immersed is impeded from entering the engine unit housing; an engine in the housing; and an air intake assembly in the engine unit housing which forms a conduit between an exterior of the engine unit housing and the engine, the air intake assembly defining an inlet fluidly communicating with exterior air, the engine unit housing defining at least one aperture aligned with the inlet, the air intake assembly defining at least one outlet fluidly connected with the engine intake, the air intake assembly being sealed such that surrounding fluids within the engine unit housing are impeded from entering the air intake assembly; and a propulsion device operatively connected to the engine.

Abstract: A watercraft and a marine engine assembly for pivotably mounting to a watercraft about a tilt-trim axis are disclosed. The marine engine assembly includes an engine unit including: an engine unit housing; an engine disposed in the housing; and an exhaust conduit disposed in the housing, an exhaust inlet defined by the exhaust conduit being fluidly connected to the engine, the exhaust conduit extending forward and upward from the exhaust inlet and then subsequently extending downward and rearward to an exhaust outlet. The marine engine assembly also has a driveshaft operatively connected to the engine and a propulsion device operatively connected to the driveshaft. A center of mass of the engine is disposed below the tilt-trim axis at least when the driveshaft is vertically oriented.