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. It featured many innovative design features: Al the passengers were placed in the twin hulls, but the pilot and crew captained the plane from a cockpit in the thicker section of the wing between the 2 hulls. The S.55 had two inline counter-rotating propellers achieved by mounting the twin engines back to...
