In one aspect, a swimjet system may include a reverse thrust system worn by a swimmer proximate the frontal upper torso. The system provides a variable amount of reverse thrust such that the user can swim-in-place or make gradual forward progress. Importantly, this may enable a user to effectively extend a small residential pool to serve the same function as a twenty-five meter pool typically found at commercial or government facilities. The system also provides laminar current under the user while swimming, which solves the problems of leg drop, the need to out-kick the arm stroke, and turbulence and wave action around the head associated with conventional swim-in-place devices. Still further, in certain embodiments the system provides a relatively strong current in the region of the arm stroke moving away from the swimmer which provides enhanced resistance for proficient swimmers.

In one aspect, a swimjet system may include a reverse thrust system worn by a swimmer proximate the frontal upper torso. The system provides a variable amount of reverse thrust such that the user can swim-in-place or make gradual forward progress. Importantly, this may enable a user to effectively extend a small residential pool to serve the same function as a twenty-five meter pool typically found at commercial or government facilities. The system also provides laminar current under the user while swimming, which solves the problems of leg drop, the need to out-kick the arm stroke, and turbulence and wave action around the head associated with conventional swim-in-place devices. Still further, in certain embodiments the system provides a relatively strong current in the region of the arm stroke moving away from the swimmer which provides enhanced resistance for proficient swimmers.

A propulsion system, for use by a swimmer in both on-water and underwater applications, includes at least one power supply unit attachable about a sleeve secured about a forearm of the swimmer, at least one corresponding propulsion unit including a motor and an impeller, the motor in electrical communication with the motor controller, the propulsion unit within a housing, the unit extending in a direction laterally offset from the forearm, near to the wrist and away from the head of the swimmer; and control apparatus for the power and propulsion units. The control apparatus includes elements for controlling pitch of an axis of the propulsion unit relative to a forearm of the swimmer, the control elements including a pivotally secured bracket, and elements for control of the level of power provided to the propulsion unit, in which each of the rotating and control apparatus are positioned for ease of accessibility by a hand of the swimmer.

A propulsion system, for use by a swimmer in both on-water and underwater applications, includes at least one power supply unit attachable about a sleeve secured about a forearm of the swimmer, at least one corresponding propulsion unit including a motor and an impeller, the motor in electrical communication with the motor controller, the propulsion unit within a housing, the unit extending in a direction laterally offset from the forearm, near to the wrist and away from the head of the swimmer; and control apparatus for the power and propulsion units. The control apparatus includes elements for controlling pitch of an axis of the propulsion unit relative to a forearm of the swimmer, the control elements including a pivotally secured bracket, and elements for control of the level of power provided to the propulsion unit, in which each of the rotating and control apparatus are positioned for ease of accessibility by a hand of the swimmer.

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.

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 scuba cylinder lower side mounting system employs two mating parts to secure the lower portion of a scuba cylinder to a diver's torso, the first affixed to either side of any side-mount or back mount Buoyancy Control Device utilizing a web waistband. A web cylinder band or stainless steel hose-clamp secures the second part to any scuba cylinder. The two parts are engaged whether in or out of the water by inserting the second part into the first and pivoting the cylinder at the point of attachment. Existing arrangements to position the cylinder valve near the diver's armpit will keep the system locked in place. It may be disengaged before entering or engaged after exiting confined underwater spaces without reaching between the cylinder and diver's torso. The system keeps the cylinder close to and aligned with the diver's torso regardless of the cylinder's change in buoyancy or diver orientation.

A scuba cylinder lower side mounting system employs two mating parts to secure the lower portion of a scuba cylinder to a diver's torso, the first affixed to either side of any side-mount or back mount Buoyancy Control Device utilizing a web waistband. A web cylinder band or stainless steel hose-clamp secures the second part to any scuba cylinder. The two parts are engaged whether in or out of the water by inserting the second part into the first and pivoting the cylinder at the point of attachment. Existing arrangements to position the cylinder valve near the diver's armpit will keep the system locked in place. It may be disengaged before entering or engaged after exiting confined underwater spaces without reaching between the cylinder and diver's torso. The system keeps the cylinder close to and aligned with the diver's torso regardless of the cylinder's change in buoyancy or diver orientation.

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.