XO-27
On June 9, 1929, the USAAC ordered two XO-27 observation/bomber prototypes.
It was a cantilevered single-decker, powered by two V-1570-9 Conqueror V-12 liquid-cooled engines of 600 hp each, which were mounted in the leading edge of the wing.
The landing gear was retractable, the three crew members were in open cockpits at the top of the fuselage.
Later, the army gave more priority to complete the XO-27 as a light bomber and one XO-27 was therefore given the designation XB-8.