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Learn how to make Screw Propelled Robot.nA screw-propelled vehicle is a land or amphibious vehicle designed to cope with difficult snow and ice or mud and swamp. nSuch vehicles are distinguished by being moved by the rotation of one or more auger-like cylinders fitted with a helical flange that engages with the medium through or over which the vehicle is moving. nModern vehicles called Amphirols and other similar vehicles have specialised uses.
