The crew of two sat in the left fuselage only. Two DB 605 engines were fitted.
The maximum speed was increased, but still did not meet that required. It had a complex and advanced structure which contributed to difficulties in producing a working prototype. The prototype MM.531 flew for the first time in October 1943 and logged over 21 hours of flight time.
Crew: 2, pilot and rear gunner
Length: 13.7 m
Wingspan: 18.55 m
Height: 4.15 m (13 ft 7 in)
Wing area: 38.52 m²
Empty weight: 5,900 kg
Powerplant: 2 × Daimler-Benz DB 605 liquid-cooled supercharged inverted V12 engines, each
Maximum speed: 615 km/h at 6,700 m
Range: 2,000 km
Service ceiling: 12,000 m
Climb to 6,000 m: 7 min. 10 sec.
Armament: 3 × 20 mm MG 151 cannons, 3 × 12.7 mm Breda-SAFAT mg.
Bombload: Up to 2,000 kg