Patent ID: 6966807

Claim:
A screw drive vehicle comprising: a main housing having a forward end and an aft end, first and second lateral sides and a central longitudinal axis extending through the forward and aft ends; at least one electric power source supported by the main housing; a first pontoon assembly having a central longitudinal axis; a first support arm connecting the first pontoon assembly to the first lateral side of the main housing; a second pontoon assembly having a central lonaitudinal axis; and a second support arm connecting the second pontoon assembly to the second lateral side of the main housing; each pontoon assembly including: a rotatable housing supported for rotation by the support arm and having at least one screw thread extending generally radially outwardly from an exterior surface of the housing; and a reversible, electrically powered pontoon drive motor operably coupled to the at least one electric power source and operably coupled with the rotatable housing so as to rotate the housing with the at least one screw thread together in a selected rotational direction, each pontoon driver motor being operable separately from the other pontoon drive motor, wherein the pontoon drive motor is fixedly and non-rotatably connected to the support arm and housed within the rotatable housing.