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X-Plane 9.70+ Martin Baker MB5. The British Martin-Baker MB 5 was the ultimate development of a series of prototype fighter aircraft built during the Second World War. Neither the MB 5 nor its predecessors ever entered production, despite what test pilots described as excellent performance. Power came from a Rolls-Royce Griffon 83 liquid-cooled V-12 engine with 2340hp and a double three de Havilland contra rotating unit. Armament was four 20 mm Hispano cannon, mounted in the wings outboard of the widely spaced retractable undercarriage. By Vasco Ribeiro.