An underwater swimming aid includes a power device and a camera instrument fixing device, and the power device includes a propeller for providing power to drive the underwater swimming aid to advance and a connecting plate fixed to the propeller; and the camera instrument fixing device includes a mounting bracket and a fixing bracket, the mounting bracket is fixed to the connecting plate and is fixedly connected to the fixing bracket, and the fixing bracket is used for fixing a camera instrument. According to the underwater swimming aid, the camera instrument fixing device is fixed to an existing underwater swimming aid, and the camera instrument is mounted on the camera instrument fixing device, so that users can photograph underwater scenes while enjoying funs brought by the swimming aid.

A water propelling device is invented to rescue a drowning person with more efficiency and less risks, which includes an adjustable clamp apparatus, a hydro-driving mechanism, a waterproof chamber and a control monitor. The adjustable clamp apparatus is able to fasten various type of life-saving buoy rings. Inside the waterproof chamber, electronic circuit boards, a power supply unit with batteries, a wireless signal communication module and antennas, various sensor modules and an electronic speed controller are wired together as a control unit. The hydro-driving mechanism is at the bottom of the adjustable clamp apparatus, which is connected with the control unit to actuate and control the movements. Wireless signals are transmitted and received between the control monitor and the control unit, allowing a rescuer to operate the water propelling device remotely to deliver a life-saving buoy ring over the surface of water toward the drowning person.

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 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.

An aquatic vessel basically includes a floating body, a submersible propulsion unit and a communication device. The floating body has an above water level surface and a below water level surface. The submersible propulsion unit is disposed on the floating body beneath the below water level surface of the floating body. The communication device is disposed on the floating body above the above water level surface of the floating body. The communication device is wired to the submersible propulsion unit, and is configured to wirelessly communicate with a control module.

An aquatic vessel basically includes a floating body, a submersible propulsion unit and a communication device. The floating body has an above water level surface and a below water level surface. The submersible propulsion unit is disposed on the floating body beneath the below water level surface of the floating body. The communication device is disposed on the floating body above the above water level surface of the floating body. The communication device is wired to the submersible propulsion unit, and is configured to wirelessly communicate with a control module.

A powered watercraft (1) for support and surface-transport of a user lying prone. The watercraft (1) has a hull (3) formed by a moulded shell (20) of expanded plastics strengthened by a metal framework (27) which extends lengthwise of the hull. The framework (27) has two arms (29) that extend laterally to hand-grips (10) on either side of the hull (3). The watercraft (1) is steered by shifting of the user's weight to one side or the other while gripping the hand-grips. The craft (1) is powered by an electric motor (5) coupled to a rearwardly-facing shrouded-propeller (4) on an underside (6) of the shell (20). Electronic motor controls are housed in a watertight metal box (31) incorporated into the framework (27), and motor-speed is regulated via lever mechanisms (9) at the hand-grips. Heat is dissipated via a heat-sink plate (42) exposed directly to the flow through the duct (7).

Disclosed is a wet suit, including: an upper jacket 100 for, putted on an upper body of a user, injecting or discharging air into an interior by the user's operation or a predetermined operation; a pair of lower pants 200 putted on a lower body of the user; and a propulsive generation portion 300 for, detachably putted on a waist of the user, generating a self-propulsive force according to the user's operation or a predetermined operation to generates a propulsive force for pushing water to a rear direction of the user.

A craft comprises a torque reaction engine, a beam, and a fin secured to the beam. The torque reaction engine causes the beam to oscillate. The fin, secured to the beam, translates through a surrounding thrust fluid as a result of oscillation of the beam. Translation of the fin through the surrounding thrust fluid produces thrust and/or lift on the fin, propelling the beam and torque reaction engine. The craft may further comprise a harness and be a diver propulsion vehicle.

A craft comprises a torque reaction engine, a beam, and a fin secured to the beam. The torque reaction engine causes the beam to oscillate. The fin, secured to the beam, translates through a surrounding thrust fluid as a result of oscillation of the beam. Translation of the fin through the surrounding thrust fluid produces thrust and/or lift on the fin, propelling the beam and torque reaction engine. The craft may further comprise a harness and be a diver propulsion vehicle.