A pool cleaner includes a body, a water source connection, a gear drive and a suspension arrangement. The body defines a suction opening on a lower surface thereof. The gear drive is mounted to the body and includes a drive housing and a pair of gears with intermeshing teeth rotatably mounted in the drive housing. The drive housing is in fluid communication with the water source connection such that associated water flow is directed around the pair of gears, imparting rotational motion thereto. The suspension arrangement is driven by the gear drive and supports the body for motion over a pool surface. An alternator can be driven by the gear drive and power various electric components. A skirt assembly and ducts above the water source connection can improve suction. The gear drive can be used to power other pool devices.

A lug track system for crawfish boats approximately 8 feet wide and 14-feet long for the use of guiding a boat along a shallow water track system thereby replacing a steel lug wheel on an existing crawfish boat.

A lug track system for crawfish boats approximately 8 feet wide and 14-feet long for the use of guiding a boat along a shallow water track system thereby replacing a steel lug wheel on an existing crawfish boat.

A watercraft propulsion system for moving a watercraft along a waterway having a bottom and a surface, wherein the watercraft presents a port side and a starboard side. The watercraft propulsion system comprises a boom assembly having a proximal end and a distal end, with the proximal end being rotatably coupled with the watercraft. The watercraft additionally comprises a wheel mounted to the distal end of the boom. The wheel includes at least one generally radially-extending blade assembly, with the blade assembly comprising a primary blade and a secondary blade. The secondary blade extends at an angle with respect to the primary blade so as to present a fluid channel between the primary blade and the secondary blade.

A watercraft propulsion system for moving a watercraft along a waterway having a bottom and a surface, wherein the watercraft presents a port side and a starboard side. The watercraft propulsion system comprises a boom assembly having a proximal end and a distal end, with the proximal end being rotatably coupled with the watercraft. The watercraft additionally comprises a wheel mounted to the distal end of the boom. The wheel includes at least one generally radially-extending blade assembly, with the blade assembly comprising a primary blade and a secondary blade. The secondary blade extends at an angle with respect to the primary blade so as to present a fluid channel between the primary blade and the secondary blade.

A modular submersible survey vehicle (MSSV) that includes a pair of continuous tracks, a chassis, a shell and a plurality of watertight modules. The MSSV can also include a mast with a mast topper, and a remote control device. A chassis is mounted on the pair of continuous tracks and covered by the shell on the sides and top but open on the bottom. The watertight modules are mounted on the chassis and contain mechanical devices and electronic components for locomotion, controlling movement of the MSSV, surveying and wireless communication. The mast topper can support a radio antenna, a global positioning antenna, a WiFi an antenna, a light and/or a camera. The remote control device is used to control the MSSV from a remote location. The shell is vented so that water freely passes into and out of the shell through the open bottom of the chassis.

A brake module for submersible autonomous vehicles is disclosed. The brake module is operatively coupled to a fluid propulsion system of an autonomous vehicle and includes a braking mechanism configured to selectively engage a wheel of the autonomous vehicle. The braking mechanism allows or restricts the wheel to rotate when the fluid propulsion system operates with an operating parameter above a parameter threshold.

A brake module for submersible autonomous vehicles is disclosed. The brake module is operatively coupled to a fluid propulsion system of an autonomous vehicle and includes a braking mechanism configured to selectively engage a wheel of the autonomous vehicle. The braking mechanism allows or restricts the wheel to rotate when the fluid propulsion system operates with an operating parameter above a parameter threshold.

An endless track belt for a submersible, autonomous vehicle is disclosed. The track belt includes an outer surface with raised track elements that are configured to both engage a supporting surface and selectively receive external grip elements configured to engage the supporting surface. The track belt also includes an inner surface with continuous, annular ridges. The continuous ridges are configured to secure the endless track belt to a drive pulley in a manner that prevents lateral movement while allowing for some longitudinal slip during rotational movement of the belt.

An endless track belt for a submersible, autonomous vehicle is disclosed. The track belt includes an outer surface with raised track elements that are configured to both engage a supporting surface and selectively receive external grip elements configured to engage the supporting surface. The track belt also includes an inner surface with continuous, annular ridges. The continuous ridges are configured to secure the endless track belt to a drive pulley in a manner that prevents lateral movement while allowing for some longitudinal slip during rotational movement of the belt.