Engineering Division XCO-6
The Engineering Division XCO-6 was an American two-seat observation biplane designed by the United States Army Engineering Division, only two were built and the type did not enter production.Two prototypes of the XCO-6 were built powered by a inverted air-cooled V-1410 engine. One was tested at McCook Field and subsequently modified but no others were built.Variants
;XCO-6
;XCO-6A
;XCO-6B
;XCO-6C
