X-Plane 9+ R-26S Gobe Training Glider v2.0. The R-26S Gobe (pronounced: Go-bay) is a Hungarian two-seat training glider, designed by Erno Rubik Sr. (father of Erno Rubik Jr., the inventor of the famous Rubik's cube) in 1958-60. The Gobe is the most typical training glider in Hungary, many of them are still in operation after many years of service. A very forgiving, good-natured aircraft, ideal to learn the fundamentals of fixed-wing flying. By Gergely Meszaros.