Thor MG-18 – McDonnell Douglas Family: Thor meters Length: 23 meters Diameter: 2.44 meters Launch Mass: 50 Low Earth Orbit Capacity: The Thor MG-18 was manufactured by McDonnell Douglas with the first launch on 1965-01-19. Thor MG-18 has 0 successful launches and 0 failed launches with a total of 0 launches. American orbital launch vehicle. Two stage vehicle consisting of 1 x Thor DM-18A + 1 x MG-18 Manufacturer McDonnell Douglas is a Commercial USA entity that was founded in and is administered by . McDonnell Douglas has 0 successful launches and 0 failed launches with a total of 0 launches.