It was a single-engined, single-seat parasol winged monoplane, but was unsuccessful, being quickly abandoned.
[1] First to be completed was the MB-10, which had tandem cockpits and was designed to be powered by a 200 hp (150 kW) Wright or Lawrance radial engine.
The MB-10's handling proved to be extremely poor,[1] while it also suffered severe vibration and was structurally weak.
[2] The MB-9 fighter was completed early in 1922,[3] differing principally from the MB-10 in the removal of the forward cockpit and the use of a 320 hp (240 kW) Wright Hispano H-3 V8 engine, cooled by a radiator situated (along with the oil tank) in a torpedo-shaped structure under the fuselage.
[1] The development of both aircraft was quickly stopped, with the types not being sent for formal evaluation by the United States Army Air Service at McCook Field.