Another heavy fighter/bomber based on the SM.88 was the SM.92. The SM.92 did away with the mid-wing crew nacelle. The crew of two sat in the left fuselage only. Two DB 605 engines were fitted.
Armament consisted of three 20 mm MG 151 cannon, two in the mid-wing and one in the right fuselage, and three 12.7 mm machine guns, one under each engine, and one remotely-controlled in the tail. A bombload of up to 2,000 kg (4,400 lb) could be carried under the inner wing, and 160 kg (350 lb) bombs were carried under the outer wings.
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. In March 1944 it was mistaken for a P-38 Lightning and attacked by a Macchi C.205. The aircraft survived by performing evasive manoeuvres, but it was so badly damaged that it was grounded for months. The SM.92 was destroyed by Allied bombing in 1944.
Crew: 2, pilot and rear gunner
Length: 13.7 m (44 ft 11 in)
Wingspan: 18.55 m (60 ft 10 in)
Height: 4.15 m (13 ft 7 in)
Wing area: 38.52 m² (414.5 ft²)
Empty weight: 5,900 kg (12,980 lb)
Powerplant: 2× Daimler-Benz DB 605 liquid-cooled supercharged inverted V12 engines, () each
Maximum speed: 615 km/h (332 kn, 382 mph) at 6,700 m (21,976 ft)
Range: 2,000 km (1,080 nmi, 1,243 mi)
Service ceiling: 12,000 m (39,360 ft)
Climb to 6,000 m (19,680 ft): 7 min. 10 sec.
3 × 20 mm MG 151 cannons
3 × 12.7 mm Breda-SAFAT machine guns
Up to 2,000 kg (4,409 lb) bombload