PURPOSE: To permit the captioned machine to travel on the water, bogs, and snow through four seasons without being fitted with attachment, by closely attaching a spiral onto the outer periphery of a float and installing a V-shaped resistor plate.

CONSTITUTION: A spiral 3 is closely attached onto the outer periphery of a rotatable float 1 whose both edges are sealed. A V-shaped resistor plate 4 is fitted onto the spiral 3, and a base body 2 is installed, keeping an interval between the float 1. Therefore, the leftward revolution is permitted without installing a rudder by transmitting power simultaneously so that a left-side float 1 advances rearward and a right-side float advances forward in case of leftward turning. While, in case of rightward turning, power is transmitted simultaneously so that the right float 1 advances rearward and the left float 1 advances forward.