X-Plane 10 Quad City Challenger II 1.2. The Challenger ultralight is a high wing, tricycle gear kit aircraft with a frame structure built from 6061-T6 aluminum alloy tubing fastened with aircraft grade AN bolts and rivets and covered with either pre-sewn Dacron envelopes or standard aircraft fabric. The engine is mounted in pusher configuration and turns the propeller through a reduction drive that uses a cogged tooth rubber belt. Features include a 3D cockpit and numerous liveries. Three variants are also included: Default tricycle, amphibian and tundra. Full description including flying tips included in the download. By Garren Hansen.