High Quality Content by WIKIPEDIA articles! The Savoia-Marchetti SM.88, SM.91 and SM.92 were Italian twin-engined heavy fighter prototypes of World War II. All featured a dual-fuselage structure and used German Daimler-Benz engines.The SM.88 was created around 1938 and intended for export. Resembling the P-61 Black Widow, it was a light-medium, land based, multi-role fighter. This was a new concept for Italian aircraft industries, though Savoia had already developed a similar aircraft with the S.55 (that had twin fuselages without a central nacelle). The SM.88 was meant as an advanced combat aircraft, offering modern design at low cost.