 The PC had cutouts at the rear and sides that enabled it to be towed into the air and steered, leading to parasailing/parascending.Domina Jalbert invented the Parafoil, which had sectioned cells in an aerofoil shape; an open leading edge and a closed trailing edge, inflated by passage through the air – the "ram-air" design.He filed US Patent 3131894 on January 10, 1963.