X-Plane 10.20 – Salmson-Moineau SM-1. The Salmson-Moineau SM1 was a French armed three-seat biplane long range reconnaissance aircraft designed by Rene Moineau for the Salmson company. The S.M.1 was unconventional, powered by a single Salmson 9A liquid-cooled radial engine mounted in the fuselage powering two airscrews mounted between the wings with a system of gears and drive shafts. Around one hundred aircraft have been built and took service during First World War The one presented here belongs to “escadrille F 58” based mid-1917 at Valdahon. Credit goes to Bernard Augras for using his pilots. By Philippe Gastebois.