Rubik R-27 Kópé

In 1958 the Hungarian Defence League (Magyar Honvédelmi Szövetség or MHSz) placed an order for three related glider designs, to fill the roles of two-seat trainer, single-seat trainer and Standard Class competition aircraft, with the Esztergom Facility of Pest County Machine Factory (PGE).

Forward of the main spar the wing was dural-covered with Rubik's characteristic corrugations, forming a torsion resistant D-box.

Broad-chord Frise-type ailerons occupied about 40% of the trailing edges and Göppingen type spoilers, opening above and below the wing, were mounted just behind the spar at about mid-span.

From their lower edges a dural keel projected forward, supporting the pilot's seat and a pointed, dural-skinned nose.

The rear fuselage of both prototypes was similar to that of the Góbé, with a semi-circular section monocoque upper part and frames and formers below producing flat, sloping sides and a rounded bottom.

[1][2][3] Both prototypes were test-flown and gained airworthiness certification but by the spring of 1963 the two-seat Góbé had proved capable of also filling the solo trainer role so it, rather than the Kópé, went into production.