The wing having a negative dihedron for towing a load comprises a flexible canopy which is defined between two lateral ends which are connected to each other, at the front, by a leading edge and, at the rear, by a trailing. The die horse is comprised of the customary top and legs wherein the legs are connected to the top and extend outwardly and downwardly therefrom, a support brace is secured across the legs and a base mounted to the legs parallel to and below the top and at least one swivel spring-loaded caster means, commonly known in the industry, mounted to the die horse. The data line being connected with the source electrode. When an input signal is supplied to the first line, the path switching circuit provides a first current path from the first line to the first control terminal in response to the input signal. This magnesium alloy serves to inhibit decrease in proof stress and creep deformation, especially primary creep deformation when used at high temperatures, typically at 200 C.