[1][2] The RK-6 was designed to comply with the Fédération Aéronautique Internationale microlight rules.
It features a strut-braced high wing, a tandem two-seat enclosed cockpit under a bubble canopy, fixed tricycle landing gear and a single engine in pusher configuration.
[1][2] The forward fuselage is made from welded steel with a wooden laminate covering in the cockpit area, while the tailboom is made from aluminum tubing The tail surfaces are constructed from aluminum tubing, are strut-braced and covered in Dacron sailcloth.
The wings are wooden, produced by Arvydas Vaicekauskas and are equipped with Junkers-style flaperons with flap deflections of 20 and 40 degrees.
The standard engine available is the 64 hp (48 kW) Rotax 582 two-stroke powerplant.