In 1936, an improved version appeared, designated ANBO 51, which was Genet-powered and featured strengthened wings.
The ANBO 51 was a fabric covered aircraft with a welded steel tube fuselage structure and steel framed rudder and elevators. The parasol wings were attached to the lower fuselage with pairs of struts on each side, assisted by further centre section struts. The wings and fixed tail surfaces were wooden structures.[1]