Rubik R-26 Góbé
The Rubik R-26 Góbé is a family of Hungarian shoulder-wing, two-seat training gliders that was designed by Ernő Rubik Sr. (father of Rubik's Cube inventor Ernő Rubik), and produced by Auto-Aero. After its introduction the R-26 Góbé became the de facto training glider type in Hungary and is still used by many clubs for basic instruction. Development. One of a series of all-metal gliders designed by Rubik from 1957 onwards, the R-26 Góbé was intended to provide two-seat instruction, with the rear seat raised for a view forward. Series production started  in 1962 and the first production aircraft flew in August 1963. Almost 200 were produced. Design. The R-26 Góbé is of predominately aluminium monocoque construction. The wings have a metal D-box ahead of a single main spar, covered in corrugated aluminum alloy sheets, aft of the spar they are covered in doped fabric. The wing has a modified a Goettingen 549 airfoil; the perforated Schempp-Hirth air brakes extend from the upper and lower wing surfaces. The slatted Frise ailerons are covered in doped fabric. The corrugated aluminum sheets on the leading edges proved to be stiff enough, having  enabled Rubik to use significantly less ribs and rivets compared to similar all-metal constructions. The result was lower production costs, and - along with the extensive use of fabric on the trailing edges and on the fuselage - an empty weight comparable to that of a single-seat glider. The landing gear consists of a fixed monowheel and a tail skid. The balanced rudder is notably large and effective. The V-tail of the first prototype was judged unsuitable for training and was replaced on the second prototype and production aircraft by a conventional unit. The aircraft controls are attached to  the control surfaces with pushrods, the trim handle is attached to the trim tab with bowden cables. The instructor seat is not equipped with instruments; the rear seat is raised in order to give the instructor a view on the instruments mounted in front of the student. A separate rear seat instrument kit was available as optional equipment, making the glider capable for instrument (IFR) training. The R-26S was designed to be easy to disassemble for ground transportation via trailer. Operational history. 193 production Góbés were built; most serving in Hungary. Fifteen were exported to Cuba, one to the United  Kingdom and one to Austria. It was not type certificated in the United States; the one imported was registered with the Federal Aviation Administration in the "Experimental - Exhibition" category. As of April 2018, it is privately owned and based in Augusta, New Jersey. In mid-2010 seventy R-26S and fifty-seven R-26SU remained on the Hungarian civil register.