The V-143 was a rework of the V-141.  It was a single-seat landplane fighter featuring a low-wing and all-metal monocoque structure with retractable landing gear and wing flaps.  It also had cowl flaps for controlling engine cooling.  It was capable of flying 250 mph at altitude.  It was eventually sold to Japan.  This aircraft is believed to have been the prototype for the Japanese “Zero” fighter of World War II.