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DEVELOPMENTS resulting from research inspired by the war's demands for greater speed, larger volume, and material and labor conservation, have led to the manufacture of many airplane parts by the impact-extrusion method. Where the previous methods called for casting, forging, or machining from solid stock, research has developed ways to use the impact-extrusion method that are more rapid and economical. Aluminum and aluminum alloys can be extruded by this method and their size is limited only by the power of the press available for the work. Small parts are produced in large quantities by the use of multiple dies. Experiments have established the pressures required to form these materials by the impact-extrusion method, complicated designs and shapes can be easily produced, and there seems to be no limit to the height to which the metal will flow, if the required force is applied to the tools.