The Lockheed Model 18 Lodestar was a commercial transport aircraft of the 1940's also used by the US army and Navy under various designations including C-56, C-57, C-59, C-60, C-66 and R50 and the British armed forces during the Second World War. The Lockheed Model 18 was a mid-wing cantilever monoplane powered by various engines, including two Wright R-1820-87 9-cylinder radial air-cooled engines providing a top speed of 426 kmh and a range of 2660 km. The military versions of the Lockheed Model 18 carried a crew of three and up to 18 fully equipped troops or other personnel. The civil airliner Lockheed Model 18 carried fourteen passengers. Research Lockheed Model 18