Rubik R-26 Góbé

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.

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 to standard R-26S configuration.

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.
• R-26SU HA-5550 is on display in the Eötvös Loránd University Savaria University Center, Szombathely.

Specifications (R-26S)

|prime units?=met |never exceed speed kmh=170 |never exceed speed note=

• Rough air speed max: 110 km/h
• Aerotow speed: 110 km/h
• Winch launch speed: 110 km/h |wing loading kg/m2=20.56 |wing loading lb/sqft=

References

Notes

Bibliography

References

1. Activate Media. (2006). "Gobe R-26S Auto-Aero".
2. Said, Bob. (November 1983). "1983 Sailplane Directory". Soaring Society of America.
3. "Hungarian Gliders 1933-2000".
4. Simons, Martin. (2006). "Sailplanes 1945-1965". EQIP Werbung & Verlag GmbH.
5. Taylor, John W R. (1962). "Jane's All the World's Aircraft 1962-63". Sampson Low, Marston & Co. Ltd.
6. Lednicer, David. (2010). "The Incomplete Guide to Airfoil Usage".
7. Jereb Gábor. "Magyar vitorlázó repülőgépek". Műszaki Könyvkiadó.
8. Federal Aviation Administration. (July 2011). "Make / Model Inquiry Results N510AS".
9. Partington, Dave. (2010). "European registers handbook 2010". Air Britain (Historians) Ltd.
10. Note:Simons places the first flight in 1960 and "Hungarian Gliders" has it exactly a year earlier than the date in Jane's
11. "Hungarian Gliders 1933-2000".
12. "HA-5393".
13. Ogden, Bob. (2009). "Aviation Museums and Collections of Mainland Europe". Air Britain (Historians) Ltd.
14. Shenstone, B.S.. (1963). "The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II". Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue.