A peddle-actuated water propulsion device includes a seat with lower body harness, a support tube, a pair of crank-type pedals, and a propeller within a protective screen guard. The pedals are in mechanical communication with the propeller. The propeller is configured to accept a plurality of differently sized blades and may be positioned at a user-selected angle.

Underwater propulsion device (10, 110) comprising a propulsion unit (11, 111) and a mounting unit (12, 112). The propulsion unit is mounted to the mounting unit and comprises an electrically driven propeller (15). The mounting unit (12, 112)is arranged to be removably fixed to a diving flipper (1).

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.

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 belt that propels a user underwater and includes a plurality of gates, each gate has a channel. A pump is found in each gate and is controlled independently form the other gates. A power supply powers the pumps to pump water in either direction through the channel. The underwater propulsion belt further includes circuitry configured to receive diver information from the user and from one or more sensors. The underwater propulsion belt controls, based on the information, the movement of the user. The user's position is calculated based on whether the user is in an upright or prone position, and maintains, based on the calculation, the user's balance.

An underwater propulsion belt that propels a user underwater and includes a plurality of gates, each gate has a channel. A pump is found in each gate and is controlled independently form the other gates. A power supply powers the pumps to pump water in either direction through the channel. The underwater propulsion belt further includes circuitry configured to receive diver information from the user and from one or more sensors. The underwater propulsion belt controls, based on the information, the movement of the user. The user's position is calculated based on whether the user is in an upright or prone position, and maintains, based on the calculation, the user's balance.

An underwater propulsion belt that propels a user underwater and includes a plurality of gates, each gate has a channel. A pump is found in each gate and is controlled independently form the other gates. A power supply powers the pumps to pump water in either direction through the channel. The underwater propulsion belt further includes circuitry configured to receive diver information from the user and from one or more sensors. The underwater propulsion belt controls, based on the information, the movement of the user. The user's position is calculated based on whether the user is in an upright or prone position, and maintains, based on the calculation, the user's balance.

An underwater propulsion belt that propels a user underwater and includes a plurality of gates, each gate has a channel. A pump is found in each gate and is controlled independently form the other gates. A power supply powers the pumps to pump water in either direction through the channel. The underwater propulsion belt further includes circuitry configured to receive diver information from the user and from one or more sensors. The underwater propulsion belt controls, based on the information, the movement of the user. The user's position is calculated based on whether the user is in an upright or prone position, and maintains, based on the calculation, the user's balance.