smaller diameter sprocket members and thereby to the axles and wheels rotation is likewise transmitted by drums 26 and 28 to sprocket members 38 and 40 on rear axle 24 axles 16 24 and 30 are all supported relative to one another with axle 30 midway between and above axles 16 and 24 by suitable rigid framework 42 which incorporates any necessary journals or bearings to accommodate rotation of the axles also supported upon and generally above framework 42 is a square fence like enclosure including upper railing 44 at a convenient height and position to be grasped by a rider standing upon drum 26 and or drum 28 from the structure illustrated and described it is apparent that a walking motion by a rider to produce rotation of drums 26 and 28 will transmit such rotation to wheels 10 12 18 and 20 in a direction opposite to that of drum rotation thus a forward walking motion will produce rotation of the wheels in a direction to propel the vehicle in the same direction the rider is facing due to reaction of the submerged portions of the wheels and spokes with the water if substantially the same rotation is imparted to both drums in the same direction the vehicle will be propelled in.