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.

A combined paddle and pump can be used to propel a small boat. The handle telescopes with a locking nut that may be loosened to allow extension and retraction of the handle. The handle is hollow throughout and a pair of check valves are provided. One check valve opens when the handle is extended and the other opens when the handle is retracted. When one check valve is open, the other is closed. When the distal end of the paddle is placed within a volume of water, extension and retraction of the handle results in a liquid first being sucked into the hollow interior of the handle and then propelled out of the handle.

A combined paddle and pump can be used to propel a small boat. The handle telescopes with a locking nut that may be loosened to allow extension and retraction of the handle. The handle is hollow throughout and a pair of check valves are provided. One check valve opens when the handle is extended and the other opens when the handle is retracted. When one check valve is open, the other is closed. When the distal end of the paddle is placed within a volume of water, extension and retraction of the handle results in a liquid first being sucked into the hollow interior of the handle and then propelled out of the handle.

An energy storage apparatus including a spherical rotating member having permanent magnets and uniquely-identifiable location-defining elements, a plurality of coils, a controller operably coupled to the plurality of coils, a power source, and a location sensing apparatus operable to detect the plurality of location-defining elements. The controller may compare time-sequential information from the location sensing apparatus to determine a rotational axis and a rotational speed of the rotating member, operate the coils to change the rotational axis speed of the rotating member, increase energy stored by the rotating member by increasing the rotational speed by operating the coils to generate magnetic fields that interact with the permanent magnets, and withdraw energy by operating the coils to generate magnetic fields that interact with the magnetic fields of the permanent magnets to produce induced current in the coils and directing the induced current to a power delivery location.

A combined paddle and pump can be used to propel a small boat. The handle telescopes with a locking nut that may be loosened to allow extension and retraction of the handle. The handle is hollow throughout and a pair of check valves are provided. One check valve opens when the handle is extended and the other opens when the handle is retracted. When one check valve is open, the other is closed. When the distal end of the paddle is placed within a volume of water or exposed to atmospheric, extension and retraction of the handle results in a fluid first being sucked into the hollow interior of the handle and then propelled out of the handle. A seal assembly prevents debris from binding tubes of the handle.

In accordance with one embodiment, a self-propelled emissions control servicing watercraft that does not require transportation by tugboat and utilizes a hydraulic power unit that supplies hydraulic power to a hydraulic positioning arm during service mode and alternately uses the same hydraulic power unit to supply hydraulic power to hydraulic propulsion thrusters during mobile mode.

In accordance with one embodiment, a self-propelled emissions control servicing watercraft that does not require transportation by tugboat and utilizes a hydraulic power unit that supplies hydraulic power to a hydraulic positioning arm during service mode and alternately uses the same hydraulic power unit to supply hydraulic power to hydraulic propulsion thrusters during mobile mode.

A drive module for submersible autonomous vehicles is disclosed. The drive module includes a propulsion element configured to engage and rotate against a surface, a motor configured to drive the propulsion element, and a controller configured to cause the motor to drive the propulsion element. The drive module also includes a housing configured to be removably, releasably coupled to the exterior of a submersible autonomous vehicle. The motor and the controller are disposed within the housing.

A drive module for submersible autonomous vehicles is disclosed. The drive module includes a propulsion element configured to engage and rotate against a surface, a motor configured to drive the propulsion element, and a controller configured to cause the motor to drive the propulsion element. The drive module also includes a housing configured to be removably, releasably coupled to the exterior of a submersible autonomous vehicle. The motor and the controller are disposed within the housing.