RD-4 Dolphin
U.S. military purchasers of the airplane, originally built as an “air yacht” for the commercial market, included the Navy, Army Air Corps and Coast Guard, the latter service procuring 13 of the airplanes and naming each of them after a star (i.e. Rigel, Vega). In Coast Guard service, the planes flew primarily in the search … RD-4 Dolphin