The invention relates to a propulsion device, in particular to an underwater propulsion device for divers (1) and swimmers comprising one or several drives (2) provided with electric motors (4) and means (3) for fixing the drives (2) to the legs or arms of the diver (1) or swimmer, wherein the electric motors (4) are provided with a sump cooling, with the electric motors (4) being arranged in waterproof housings (5) and each waterproof housing (5) only being partially filled with a cooling liquid. By arranging the drives (2) on the extremities of the diver (1) or swimmer, the flexibility and mobility are significantly increased; at the same time, the provision of a sump cooling system improves heat dissipation and thus increases the power density.

The invention relates to a portable self-adjusting underwater booster with a life-saving device which includes a belt, a life-saving device and a propulsion device. The belt includes a rear end of the belt and a front end of the belt. A fastener is provided on the front end of the belt. The fastener is used to fasten the belt. The rear end of the belt is provided with a mounting plate, a first bag and a second bag at outer side. The mounting plate is provided with a connecting hole and an arc groove at outer side. The arc groove is provided with an arc rack. The life-saving device includes a compressed gas tank disposed in the second bag, a valve, and an airbag. The airbag is fixedly connected to the belt. The propulsion device includes an upper cylinder and a lower cylinder. The portable self-adjusting underwater booster with a life-saving device has advantages of having simple and reasonable structure, being convenient to use, safe and reliable, high degree of intelligence with life-saving device. It effectively solves the problem regarding the existing underwater boosters not having life-saving function.

An underwater propulsion system is disclosed comprising a foot board with one or more battery-powered propulsion units. A throttle control system may be enabled in the foot board such that a movement of the user's foot controls the throttle. Flattened Lithium batteries allow thin lightweight construction of the foot board. Use of trolling motors as propulsion units provides thrust advantages over pre-existing underwater scooters.

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.

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.

An underwater propulsion system is disclosed comprising a foot board with one or more battery-powered propulsion units. A throttle control system may be enabled in the foot board such that a movement of the user's foot controls the throttle. Flattened Lithium batteries allow thin lightweight construction of the foot board. Use of trolling motors as propulsion units provides thrust advantages over pre-existing underwater scooters.

An underwater propulsion system is disclosed comprising a foot board with one or more battery-powered propulsion units. A throttle control system may be enabled in the foot board such that a movement of the user's foot controls the throttle. Flattened Lithium batteries allow thin lightweight construction of the foot board. Use of trolling motors as propulsion units provides thrust advantages over pre-existing underwater scooters.

The present invention belongs to the field of equipment for living or working underwater, more precisely to the field of diving equipment, especially underwater propulsion vehicles for divers. The object of the invention is an underwater scooter for divers. The essence of the underwater scooter for divers is in that the thruster is placed above the scuba diving tank when used and below it when it is not used. The interchangeable battery pack is placed around the scuba dive tank. The thruster rotation between both positions is enabled by contact hinge which connects the thruster and the interchangeable battery pack. By holding the command joystick in his/her hand the diver is managing the device. There is a safety cord with karabiner snap hook attached to the command joystick which could be attached to the scuba diving inflated life jacket. Thus, the diver is able to steer the device hands-free.

The present invention belongs to the field of equipment for living or working underwater, more precisely to the field of diving equipment, especially underwater propulsion vehicles for divers. The object of the invention is an underwater scooter for divers. The essence of the underwater scooter for divers is in that the thruster is placed above the scuba diving tank when used and below it when it is not used. The interchangeable battery pack is placed around the scuba dive tank. The thruster rotation between both positions is enabled by contact hinge which connects the thruster and the interchangeable battery pack. By holding the command joystick in his/her hand the diver is managing the device. There is a safety cord with karabiner snap hook attached to the command joystick which could be attached to the scuba diving inflated life jacket. Thus, the diver is able to steer the device hands-free.

An underwater propulsion system is disclosed comprising a foot board with one or more battery-powered propulsion units. A throttle control system may be enabled in the foot board such that a movement of the user's foot controls the throttle. Flattened Lithium batteries allow thin lightweight construction of the foot board. Use of trolling motors as propulsion units provides thrust advantages over pre-existing underwater scooters.