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 self-propelled personal flotation apparatus provides a motorized flotation board which includes internal water propulsion equipment and associated push-button controls. In use, a user straps the apparatus onto their chest area, enters a body of water such as a lake, a pond, or a pool, and is propelled across the water surface.

A self-propelled personal flotation apparatus provides a motorized flotation board which includes internal water propulsion equipment and associated push-button controls. In use, a user straps the apparatus onto their chest area, enters a body of water such as a lake, a pond, or a pool, and is propelled across the water surface.

A waterjet propulsion apparatus comprising a motor, an impeller driven by the motor via a drive shaft, and a power source. A fluid flow-path is formed through the apparatus, the flow-path extending from at least one fluid inlet, through two propulsion passages, each propulsion passage extending from a propulsion inlet to an outlet located at a rear end of the apparatus. The impeller is located within the flow-path, after the at least one fluid inlet, and before the propulsion inlet of the each of the propulsion passages. The motor is located outside of the flow-path, between the two propulsion passages, and behind the impeller. The apparatus is advantageous in that it provides a compact and lightweight construction that can, for example, be used as part of a personal marine propulsion device that can be used by an individual.

An underwater propulsion device is disclosed comprising two sleeves for fitting around each of a user's lower legs, with each sleeve mounting a propulsion unit, and the sleeves being connectable by a bar between them during underwater operation of the device by the user.

An underwater propulsion device is disclosed comprising two sleeves for fitting around each of a user's lower legs, with each sleeve mounting a propulsion unit, and the sleeves being connectable by a bar between them during underwater operation of the device by the user.

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.

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.

The invention relates to a propulsion device comprising a platform that is arranged so as to accommodate a passenger and cooperates with a thrust unit comprising a main nozzle, advantageously oriented from the bow to the stern of the device, and two secondary nozzles that are lateral and are positioned essentially at the bow of the propulsion device. The secondary nozzles are mounted so as to be mobile about a transverse axis so as to be moved by actuators controlled by a processing unit that implements a method for controlling the secondary nozzles, thus providing automatic control assistance to the passenger.