The Rolandas Kalinauskas RK-5 Ruth, also called the Viltis (English: hope), is a Lithuanian light aircraft, designed and produced by Rolandas Kalinauskas, of Prienai.
The RK-5 features a strut-braced high wing, a four-seat enclosed cabin accessed via doors, fixed tricycle landing gear and a single engine in tractor configuration.
[1][2] The aircraft fuselage is made from welded steel tubing supplemented by wooden stringers, while the wing is of wooden structure, all covered in doped aircraft fabric.
The standard engine employed is the 140 hp (104 kW) Avia M 332 four-cylinder, inverted, air-cooled, supercharged, inline, four-stroke powerplant.
It is supplied with a wide range of standard equipment, including leather seats and tinted windows.