Martin B-10Martin B 10 airplane model. The Martin B 10, the first of the "modern day" all metal monoplane bombers to be produced in quantity, featured such innovations as internal bomb storage, retractable landing gear, a rotating gun turret, and enclosed cockpits. It was so advanced in design that it was 50% faster than its contemporary biplane bombers and as fast as most of the fighters. When the Air Corps ordered 121 B 10s in the 1933 1936 period, it was the