An oar for use in propelling a watercraft through water includes a first circular paddle portion. An edge hole extends into an edge of the first paddle portion. The oar also includes a second circular paddle portion, with an edge hole extending into an edge of the second paddle portion. The oar also includes a handle portion having a first end and a second end opposite the first end. The first paddle portion edge hole and the handle portion first end are structured so that the handle portion first end is detachably securable in the first paddle portion edge hole. The second paddle portion edge hole and the handle portion second end are structured so that the handle portion second end is detachably securable in the second paddle portion edge hole.

An amphibious pumping vehicle has a floatable vehicle body, a ground engaging propulsion structure, a fluid pump, a plurality of fluid nozzles comprising a first fluid nozzle connected by a fluid conduit to the fluid pump and at least one second fluid nozzle connected to the fluid conduit, a valve structure in the fluid conduit, the plurality of fluid nozzles and the valve structure co-operating to provide directional control and motive power for the vehicle when floating, and a power source configured to provide power to both the ground engaging propulsion structure and the fluid pump.

A retractable wheel and/or track drive assembly for an amphibian comprising an actuator, a retraction linkage assembly movable between a protracted position and a retracted position, a suspension assembly at least partially connected to the retraction linkage assembly and movable between a protracted position and a retracted position, and at least one wheel and/or track drive, wherein when the retraction linkage assembly and the suspension assembly are protracted then the retraction linkage and/or suspension assembly supports and/or holds at least one wheel and/or track drive in a ground engaging position for use on land.

This cooling device for an amphibious vehicle includes: a heat exchanger mounted in the amphibious vehicle; a coolant introduction passage through which cooling air or cooling water can be introduced from the outside to the heat exchanger as a coolant; a cooling air discharge passage through which the cooling air having passed through the heat exchanger can be discharged to a cooling air discharge portion communicating with the outside; and a cooling water discharge passage through which the cooling water having passed through the heat exchanger can be discharged to a cooling water discharge portion communicating with the outside. The cooling air discharge passage and the cooling water discharge passage are formed such that at least the cooling air discharge portion and the cooling water discharge portion are independent of each other.

A large-scale, high-mobility all-terrain vehicle is equipped with at least two articulated front legs and at least two articulated rear legs. Each articulated leg is connected to the vehicle structure about two mutually orthogonal axes to allow a variation of the track width distance between each pair of track assemblies and a variation of the height of the vehicle structure with respect to each track assembly. Each track assembly is connected to the respective leg about a horizontal transverse axis and about a vertical axis, and about a longitudinal axis. The vehicle structure has a front module and a rear module articulated about a longitudinal axis and a driving cabin that can be rotated downwards to allow ample visibility of the ground in front. The track assemblies are connected to the respective articulated legs by quick coupling devices.

A boat is fitted with retractable wheels which can pivot between an extended land position and a retracted water position. A slot is formed in the hull of the boat. A housing sealing engages about the slot to prevent water entering the boat through the slot. The housing supports a pivot. An arm member is connected to the pivot and a wheel is connected to the arm member. The arm member can pivot through the slot between the wheel retracted and wheel extended positions.

A boat is fitted with retractable wheels which can pivot between an extended land position and a retracted water position. A slot is formed in the hull of the boat. A housing sealing engages about the slot to prevent water entering the boat through the slot. The housing supports a pivot. An arm member is connected to the pivot and a wheel is connected to the arm member. The arm member can pivot through the slot between the wheel retracted and wheel extended positions.

A chassis system of an amphibious remote control vehicle is provided, including a vehicle chassis and a hull form chassis, the vehicle chassis comprises a first joint portion and a second joint portion. The width of one end of the hull form chassis is smaller than that of one other end of the hull form chassis, the hull form chassis comprises a third joint portion being corresponding to the first joint portion and two fourth joint portions being corresponding to the second joint portion. The hull form chassis comprises a hull form chassis centerline, the hull form chassis centerline extends obliquely to two sides to form two inclined surfaces, the first joint portion is engaged with the third joint portion, and the second joint portion and the two fourth joint portion are combined by a fixing member.

A propeller switching system of an amphibious and remotely controlled car is provided, including a controller, a transmission mechanism, a propeller mechanism, and a wheel driving mechanism. When an electronic device transmits an operation message and a first control message to the controller, a propeller rotates. When the electronic device transmits the operation message and a second control message to the controller, the wheels of the amphibious and remotely controlled car rotate.

An amphibious platform vehicle-vessel to support and to move hydraulically operated and controlled earth-moving and lifting equipment, such as excavators and cranes, on solid ground, semi-solid or marshy ground, shallow water, and deeper water. The modular units can be transported to a worksite on separate trailers and assembled and reconfigured on site. Two compartmented pontoon units are mounted to an adaptive cross member that can accommodate different types of moving-lifting equipment through different mounting flanges, and to auxiliary cross members. Propulsion is provided through amphibious cleats on drive chains in chain tracks driven by dual-motor driving drums and over a tension-adjusting passive chain roller, surrounding a sealed pontoon shell internally reinforced with bulkhead partitions, beam shell-bottom stiffeners, and pressed-angle shell-bottom stiffeners. An extendable auxiliary float can be extended outward from each compartmented pontoon for increased stability in floating operations. Spud units having a chain-drive spud and a spud-driving mount unit with spud-mount wear strips are hydraulically raised and lowered by a spud-driver motor at the command of the equipment operator using a spud-control switch.