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Rubik R 26 Góbé

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Wingspan  14 m
Manufacturer  Auto-Aero
Rubik R-26 Góbé Sextant Blog 105 R26 quotGbquot Rubik Ern oktat vitorlzgp

Glider crosswind landing rubik r 26 g b at lhdk


The Rubik R-26 Góbé is a family of Hungarian shoulder-wing, two-seat training gliders that was designed by Ernő Rubik (the father of Ernő Rubik, the inventor of the Rubik's Cube), 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.

Contents

Rubik R-26 Góbé Rubik R26 Gb vitorlzgp fortepan15383 1967 2011 a Flickr

Design and development

Rubik R-26 Góbé httpsuploadwikimediaorgwikipediacommonsthu

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.

Rubik R-26 Góbé Rubik R26 quotGbquot glider trainer landing in Xplane 9 outside view

The Góbé is of predominately aluminium monocoque construction. The wings have a metal D-box ahead of a single main spar, covered in corrugated metal, 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 surface. The slatted Frise ailerons are covered in doped fabric. The stiffness of the corrugated metal leading edge provides high structural strength for the wings, enabling Rubik to omit extra ribs and rivets. This resulted in lower production costs and lower empty weight compared to other two-seater gliders typical of that era. The landing gear consists of a fixed monowheel and a tail skid. 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. All the leading edges on the empennage are made of corrugated metal, the control surfaces are covered in doped fabric. The rudder is notably large and effective, its upper part serves as an aerodynamic servo, reducing the necessary operating force. The control force is transferred to the control surfaces via pushrods, except for the trim tab (mounted on the right elevator), which uses 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. It was not certified and the one imported to the United States was registered with the Federal Aviation Administration in the Experimental - Exhibition category.

Operational history

In all, 193 production Góbés were built, most serving in Hungary. Fifteen were exported to Cuba, one to the United Kingdom and one to Austria. One R-26S was imported into the US. As of July 2011 it is privately owned and based in Redlands, California. In mid-2010 seventy R-26S and fifty-seven R-26SU remained on the Hungarian civil register.

Variants

R-26P1
First prototype, first flown in May 1961. V-tail.
R-26P2
Second prototype, first flown in August 1961. Conventional tail.
R-26S Góbé
Production aircraft, built from 1963. 115 produced.
R-26SU Góbé '82
Modified to meet European/US market requirements. Production begun in 1982, totalling 78.
R-26M Motor Góbé
A two-stroke engine was mounted on one of the R-26S models for experimental purposes. The aircraft was later reverted back to R-26S.

Aircraft on display

  • R-26S HA-5355 is on display in the Transport Museum of Budapest.
  • R-26S HA-5410 is on display in the Museum of Hungarian Aviation, Szolnok.
  • R-26S HA-5392 is on display in the Slovak Technical Museum, Košice.
  • Specifications (R-26S)

    Data from Sailplane Directory and Soaring The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II

    General characteristics

  • Crew: two, pupil and instructor
  • Wingspan: 14.0 m (45 ft 11 in)
  • Wing area: 18.000 m2 (193.75 sq ft)
  • Aspect ratio: 10.88:1
  • Airfoil: Goettingen 549
  • Empty weight: 206 kg (454 lb)
  • Gross weight: 370 kg (816 lb)
  • Max takeoff weight: 400 kg (882 lb)
  • Performance

  • Stall speed: 60 km/h (37 mph; 32 kn)
  • Never exceed speed: 170 km/h (106 mph; 92 kn)
  • Rough air speed max: 110 km/h (68.4 mph; 59.4 kn)
  • Aerotow speed: 110 km/h (68.4 mph; 59.4 kn)
  • Winch launch speed: 110 km/h (68.4 mph; 59.4 kn)
  • g limits: +2.8 -1 at 170 km/h (105.6 mph; 91.8 kn)
  • Maximum glide ratio: 23.7:1 at 81 km/h (50.3 mph; 43.7 kn)
  • Rate of sink: 0.96 m/s (189 ft/min) at 75 km/h (46.6 mph; 40.5 kn)
  • Wing loading: 20.56 kg/m2 (4.21 lb/sq ft) at normal gross weight, 22.22 kg/m² (4.55 lb/sq ft) at maximum take-off weight
  • References

    Rubik R-26 Góbé Wikipedia


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