Vought VO-1

In January 1927 the Chance Vought company produced a single-seat fighter version of its mass-produced VO-1 shipboard observation aircraft. A two-bay bi-plane, the VO-1 was not entirely suitable as the basis for a competitive fighter, and with only the same engine as before, the 200-hp Wright R-1790 Whirlwind, performance was inadequate. Nevertheless, 20 FU-1 fighters were built for the US Navy.