An assembly for a retractable thruster suitable for attachment to the hull of a maritime vessel. The assembly comprises a thruster accommodating structure from which the thruster may be deployed into and retracted from the water. The thruster accommodating structure is provided with a drive assembly that suspends the thruster and further comprises a thruster deploying and retracting device, a thruster rotating device, a motor assembly, and a switching device. The same drive assembly is used for deploying, retracting, and rotating the thruster.

An assembly for a retractable thruster suitable for attachment to the hull of a maritime vessel. The assembly comprises a thruster accommodating structure from which the thruster may be deployed into and retracted from the water. The thruster accommodating structure is provided with a drive assembly that suspends the thruster and further comprises a thruster deploying and retracting device, a thruster rotating device, a motor assembly, and a switching device. The same drive assembly is used for deploying, retracting, and rotating the thruster.

A boat having an electric motor coupled with an electrical store is disclosed. The electrical store includes a storage element, and positive and negative poles in current-conducting connection with the storage element. An isolating circuit element is operatively connected to a user activatable emergency stop switch. The isolating circuit element is configured to, upon activation of the emergency stop switch, isolate the current-conducting connection between the storage element and at least one of the poles.

A boat having an electric motor coupled with an electrical store is disclosed. The electrical store includes a storage element, and positive and negative poles in current-conducting connection with the storage element. An isolating circuit element is operatively connected to a user activatable emergency stop switch. The isolating circuit element is configured to, upon activation of the emergency stop switch, isolate the current-conducting connection between the storage element and at least one of the poles.

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 submerged. 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.

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 submerged. 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.

A watercraft and a waterproof electronics container are provided. The watercraft includes a flotation portion. A strut is removably affixed to a portion of the watercraft. A first connector portion is mounted to the upper end of the strut. A waterproof electronics container includes a second connector portion is disposed such that the second connector forms at least one electrically conductive pathway with the first connector portion when both are affixed to the watercraft. The waterproof electronics container is removably affixed to the said watercraft. In one aspect, the waterproof electronics container houses a power source capable of powering an electric motor that propels the watercraft.

A jet propelled boat includes a boat body, a hatch, a pair of front end movement restrictors spaced apart from each other in a right-left direction in a vicinity of a front end of the hatch so as to restrict movement of the front end with respect to the deck, a rear end lock provided in a vicinity of a rear end of the hatch so as to restrict upward movement of the rear end, and a pair of rear end movement restrictors provided on both sides of the rear end lock in the right-left direction so as to restrict horizontal movement of the rear end.

A jet propelled boat includes a boat body, a hatch, a pair of front end movement restrictors spaced apart from each other in a right-left direction in a vicinity of a front end of the hatch so as to restrict movement of the front end with respect to the deck, a rear end lock provided in a vicinity of a rear end of the hatch so as to restrict upward movement of the rear end, and a pair of rear end movement restrictors provided on both sides of the rear end lock in the right-left direction so as to restrict horizontal movement of the rear end.

A marine propulsion device includes a drive shaft, a propeller shaft, and a lower case that houses the propeller shaft. In the marine propulsion device, a power generator generates power using a torque of the drive shaft or the propeller shaft, and the generated power is supplied to an electric actuator to drive a driven unit through a first power line, wherein the electric actuator is controlled by a controller. At least a portion of the driven unit, at least a portion of the electric actuator, at least a portion of the power generator, and the first power line are located in the lower case.