na_o47.zip

The O-47 was developed as a replacement for O-19 and Douglas O-38 observation biplanes. The Air Corpsordered 174 O-47s in 1937 to 1938, 93 of which were assigned to National Guard units. In 1938, the Army ordered 74 O-47Bs with a redesigned engine cowling for better cooling, a more powerful...