A handheld underwater aircraft includes a battery compartment (12) and propellers. There are at least two propellers, which are symmetrically distributed on both sides of the battery compartment (12), and are connected to the battery compartment (12). A special design with axes of the propellers being unparallel with an axis of the battery compartment (12) is adopted, and unparallel included angles make component forces generated by the various propellers in a direction of motion of a non-underwater aircraft offset each other, and enable the underwater aircraft to maintain balanced and forward-forward motion. The design with the axes of the propellers being unparallel with the axis of the battery compartment (12) leads to a little power loss, but avoids a larger power loss caused by the impact of water on the human body, thereby comprehensively improving the thrust of the underwater aircraft in use.

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.

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.

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.

A submersible propeller that includes a battery and propellers in which: the propellers include a left propeller and a right propeller; front portions of the left propeller and the right propeller are connected to a waist-wearing power supply battery through a power supply cable for the left propeller and a power supply cable for the right propeller respectively. Rear portions of the left propeller and the right propeller are connected to a left angle controller and a right angle controller through a connection cable for the left angle controller and a connection cable for the right angle controller respectively. The left propeller and the left angle controller are symmetrically distributed left-and-right with respect to the right propeller and the right angle controller. By using angle controllers on the legs, various modes such as advancing, variable-speed advancing, retreating, turning, and in-situ spinning can be implemented.

A submersible propeller that includes a battery and propellers in which: the propellers include a left propeller and a right propeller; front portions of the left propeller and the right propeller are connected to a waist-wearing power supply battery through a power supply cable for the left propeller and a power supply cable for the right propeller respectively. Rear portions of the left propeller and the right propeller are connected to a left angle controller and a right angle controller through a connection cable for the left angle controller and a connection cable for the right angle controller respectively. The left propeller and the left angle controller are symmetrically distributed left-and-right with respect to the right propeller and the right angle controller. By using angle controllers on the legs, various modes such as advancing, variable-speed advancing, retreating, turning, and in-situ spinning can be implemented.

Disclosed is a compact egg-shaped propeller, including an outer shell, an inner shell, and a driving motor unit arranged in the inner shell. The outer shell is detachably connected to the inner shell; the outer shell is egg-shaped; the outer shell is provided with a front cover at a top of the driving motor unit; the outer shell is provided with a jet orifice at a tail portion of the driving motor unit; blades are connected to one side of the driving motor unit close to the front cover; the driving motor unit is connected to a main control compartment; foldable handles are connected to a left side and right side of the main control compartment respectively; and the foldable handles are movably connected to the inner shell. By means of the layout, the gravity center is centered, the structure is compact and simple, and the appearance is simple and beautiful; the blades and the motor are designed in front, and the semi-circular front cover prevents debris and hands from entering; a battery indicator can display current remaining power to a user; a buoyancy block ensures that the whole device does not sink down after a user loosens the hands in water, facilitating search; and when the device is not in use, the handles can be folded, thereby facilitating storage and carrying.