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X-Plane 10 Savoia-Marchetti S.55X. The Savoia-Marchetti S.55 was a double-hulled flying boat produced in Italy beginning in 1924. Shortly after its introduction, it began setting records for speed, payload, altitude and range. The S55X variant was fitted with Isotta-Fraschini Asso 750 engines for North Atlantic formation flights. It was later armed and used as a reconnaissance-bomber. 25 built of this type were built. Package includes comprehensive documentation. By Billy Bargagliotti.