Abstract: A water-borne vehicle with floats, a frame which is mounted on the floats providing a seat and a steering mechanism, and a propulsion means for propelling the vehicle in the water. The propulsion means comprises a plate which is generally parallel to the surface of the water and which is displaced up and down by a foot pedalled crank. A connecting arm is attached at one end rigidly and perpendicularly to the plate and at the opposite end to the crank. The horizontal position of the plate is maintained by an upright member which is slidably retained between rollers that maintain its upright position and is pivotally attached to the plate. As the crank is rotated, one end of the connecting arm follows a circular path, displacing the plate upward and downward. As the plate oscillates up and down, the upright member slides up and down between the rollers and maintains the horizontal position of the plate as directly below the upright member.