A small marine vessel includes a vessel body, a propulsion device, a propulsion device housing provided in a rear portion of the vessel body and that houses the propulsion device, a first cover that substantially covers and seals the propulsion device housing, and a second cover disposed above the first cover and that covers the first cover and an opening of the propulsion device housing.

A small marine vessel includes a vessel body, a propulsion device, a propulsion device housing provided in a rear portion of the vessel body and that houses the propulsion device, a first cover that substantially covers and seals the propulsion device housing, and a second cover disposed above the first cover and that covers the first cover and an opening of the propulsion device housing.

An outboard motor includes a mount on which an engine is mounted, an engine cover, and a sealing structure. The engine cover is divisible into a top portion, a front bottom portion, and a side bottom portion. A first seal in the sealing structure integrally includes a first portion, a second portion, and a third portion. The first portion seals the boundary between the top portion, the front bottom portion, and the side bottom portion. The second portion seals the boundary between the front bottom portion, the mount, and the side bottom portion. The third portion seals the boundary between the front bottom portion and the side bottom portion.

A marine drive includes an engine; a cowl having first and second cowl portions. The first cowl portion is movable with respect to the second cowl portion into an open position in which the engine is manually accessible and a closed position in which the engine is enclosed; and a rigging port in the second cowl portion. The rigging port provides a passageway for rigging connectors extending from the engine to a component located remotely from the engine. A rigging window provides manual access to the rigging connectors and the engine, including when the first cowl portion is in the closed position. A removable access door covers the rigging window and prevents manual access to the engine and rigging connectors via the rigging window. The removable access door is fastened to the second cowl portion by a removable fastener that is hidden from view.

A battery management system comprises a housing having a bottom wall, a top wall, and a side wall extending between the bottom wall and the top wall. The side wall has an interior mounting surface and an exterior mounting surface. A plurality of electrical components are mounted on the interior mounting surface of the side wall and a plurality of electrical components are mounted on the exterior mounting surface of the side wall. The bottom wall of the housing may have an interior mounting surface. There may be a plurality of electrical components mounted on the interior mounting surface of the bottom wall. The top wall of the housing may have an interior mounting surface. There may be a plurality of electrical components mounted on the interior mounting surface of the top wall.

A battery management system comprises a housing having a bottom wall, a top wall, and a side wall extending between the bottom wall and the top wall. The side wall has an interior mounting surface and an exterior mounting surface. A plurality of electrical components are mounted on the interior mounting surface of the side wall and a plurality of electrical components are mounted on the exterior mounting surface of the side wall. The bottom wall of the housing may have an interior mounting surface. There may be a plurality of electrical components mounted on the interior mounting surface of the bottom wall. The top wall of the housing may have an interior mounting surface. There may be a plurality of electrical components mounted on the interior mounting surface of the top wall.

A cowling for a marine engine has an outer shell and a supporting structure bonded to an interior surface of the outer shell. The supporting structure has an elongated member that extends along the interior surface and provides rigidity to the outer shell. The supporting structure comprises a plurality of flex joints that are spaced apart along the elongated member and allow the supporting structure to flex transversely to the elongated member and thus follow a contour of the interior surface during bonding to the outer shell. Corresponding methods are disclosed.

An arrangement and a method for installing a propulsion unit to a hull of a ship. The propulsion unit comprises an upper part of the propulsion unit attachable to the hull of the ship and a lower part of the propulsion unit where to a propeller shaft is rotatably supported, and the upper part of the propulsion unit having flanges to attach the flanges tightly to the hull, and wherein there is an aperture in the bottom of the hull where to the propulsion unit is to be installed. The arrangement comprises a plurality of watertight covers covering openings in the bottom of the hull and a plurality of watertight covers covering openings in the top of the upper part of the propulsion unit, wherein the arrangement comprises a removable hull-side cover covering at least the opening under it, and at least one removable propulsion unit side cover covering the opening under it and facing the opening, and the removable covers are bolted from the hull-side.

An arrangement and a method for installing a propulsion unit to a hull of a ship. The propulsion unit comprises an upper part of the propulsion unit attachable to the hull of the ship and a lower part of the propulsion unit where to a propeller shaft is rotatably supported, and the upper part of the propulsion unit having flanges to attach the flanges tightly to the hull, and wherein there is an aperture in the bottom of the hull where to the propulsion unit is to be installed. The arrangement comprises a plurality of watertight covers covering openings in the bottom of the hull and a plurality of watertight covers covering openings in the top of the upper part of the propulsion unit, wherein the arrangement comprises a removable hull-side cover covering at least the opening under it, and at least one removable propulsion unit side cover covering the opening under it and facing the opening, and the removable covers are bolted from the hull-side.

A low emission submersible engine is part of a multipurpose aquatic device, such as an aquatic craft or an electrical generator. A propulsion system having a propeller is coupled to the submersible engine to produce a swimmer propulsion machine and a generator is attached to the engine to produce an electrical generator. The submersible engine receives air from a snorkel that extends up above a water line. The aquatic device has a fuel reservoir which may receive liquid fuel or may receive a fuel cylinder. Floatation chambers keep the aquatic device afloat with the engine submerge. The exhaust assembly and exhaust ports from the engine may also be submerged and the exhaust ports may provide additional thrust. A propulsion system housing integrates the drive shaft and propeller, clutch coupler, exhaust conduits and water flow conduits and is detachably attachable to the engine.