NIAI RK

RK
Role Telescopic Wing Research Aircraft
National origin USSR
Manufacturer NIAI (Naoochno-Issledovatel'skiy Aero-Institoot - scientific test aero-institute)
Designer Grigorii Ivanovich Bakshayev
First flight 1937
Number built 1


The RK (Razdvizhnoye Krylo – extending wing) (a.k.a. LIG-7) was a two-seat cabin aircraft designed and built in the USSR from April 1936.

Development

In 1930 the LIIPS ( - Leningrad institute for sail and communications engineers) formed a UK GVF ( - training centre for civil air fleet), in turn the UK GVF formed the NIAI (Naoochno-Issledovatel'skiy Aero-Institoot - scientific test aero-institute) which became the focus of several good design engineers who were given command of individual OKB (Osboye Konstrooktorskoye Byuro – personal design/construction bureau).

Along with contemporary aircraft designers, in the USSR and abroad, Grigorii Ivanovich Bakshayev was interested in the concept of variable geometry aircraft, where the size and/or shape of wings are altered according to the stage of flight, or desired characteristics. One methods of achieving this was with a telescopic wing, where wing sections of bigger aerofoil section and area are telescoped out over the original wing. He designed the RK to use a telescopic wing with six sections, of gradually increasing size, extending outwards from the fuselage to the demands of the pilot.

The airframe of the RK was a simple structure of steel tube fuselage and a wire braced monoplane wing of constant M-6 section constructed of wood. The extending wing sections were each 460 mm wide and were extended by the observer in the rear cockpit operating a hand-crank connected to cables via a pulley system to pull each section out in turn, with each section pulling the next behind it. Successful flight tests starting in 1937 led to authorisation for a fighter with telescopic wings to be designed and built; The RK-I (Razdvizhnoye Krylo - Istrebitel – extending wing fighter).


Specifications (RK)

Data from Gunston, Bill. "Encyclopaedia of Russian Aircraft 1875-1995". London:Osprey. 1995. ISBN 1-85532-405-9

General characteristics

Performance

See also

Aircraft of comparable role, configuration and era
Related lists

References

    • Gunston, Bill. “The Osprey Encyclopaedia of Russian Aircraft 1875–1995”. London, Osprey. 1995. ISBN 1-85532-405-9
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