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Custer's work on the semi-circular channel design led to the construction of the CCW-1, now on display in the National Air & Space Museum. The first of four prototypes, the CCW-1 first flew in 1942. Custer tested the aircraft both with the outer wing panels shown in the above pictures attached and with them removed removed, leaving only the channels. The machine demonstrated adequate performance, even with one engine inoperative, and could takeoff in as little as 200 ft (61 m). Further prototype development continued over the course of the next two decades, including the CCW-2. The final prototype, the CCW-5, first flew in 1953 and the first production model appeared in 1964.