A light-weight soft wing-sail for a wind-propelled vehicle includes a free standing rotating mast to be mounted in a vertical position on the vehicle and, three fully battened sail panels that together define the skin of the wing sail. Spreaders extend transversely of the mast and impart to them a selected airfoil shape having a leading edge fore of the mast and a trailing edge aft of the mast. Two vertical tracks secured to both sides of the mast top and to the outer ends of each spreader. Sliders are secured to the sail panels and are slidable in the tracks, such as to permit hoisting and reefing each of the sail panels independently along the tracks. A boom is pivotally coupled to the mast and a ram is secured on one side to the lower spreader and on the other side to the boom such that the leading edge and the trailing edge define one wing-sail unit and trims the airfoil shape. An outhaul line pulls the clews of both trailing edges together through a block to evenly tension rearwardly the clews of the trailing edge and also to permit each of the clews to independently slide along the boom when the airfoil shape is changed.