Rolandas Kalinauskas RK-5 Ruth

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 aircraft is supplied as a complete ready-to-fly-aircraft.[1][2]

RK-5 Ruth
Role Light aircraft
National origin Lithuania
Manufacturer Rolandas Kalinauskas
Status In production (2015)
Number built at least one
Unit cost
40,000 (2015)

Design and development

The RK-5 is derived from the Rolandas Kalinauskas RK-3 Wind. 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 11 m (36.1 ft) span wing has an area of 15.2 m2 (164 sq ft) and mounts flaps. The wing is supported by a single strut on each side with a single jury strut. The standard engine employed is the 140 hp (104 kW) Avia M 332 four-cylinder, inverted, air-cooled, supercharged, inline, four-stroke powerplant.[1][2][3]

The aircraft has an empty weight of 450 kg (990 lb) and a gross weight of 900 kg (2,000 lb), giving a useful load of 450 kg (990 lb). It is supplied with a wide range of standard equipment, including leather seats and tinted windows.[1][2]

Specifications (RK-5)

Data from Bayerl and Tacke[1][2]

General characteristics

  • Crew: one
  • Capacity: three passengers
  • Wingspan: 11 m (36 ft 1 in)
  • Wing area: 15.2 m2 (164 sq ft)
  • Empty weight: 450 kg (992 lb)
  • Gross weight: 900 kg (1,984 lb)
  • Fuel capacity: 130 litres (29 imp gal; 34 US gal)
  • Powerplant: 1 × Avia M 332 four cylinder, inverted, air-cooled, supercharged, inline four-stroke aircraft engine, 100 kW (140 hp)
  • Propellers: 2-bladed wooden, electrically adjustable, 1.8 m (5 ft 11 in) diameter


  • Maximum speed: 230 km/h (140 mph, 120 kn)
  • Cruise speed: 195 km/h (121 mph, 105 kn)
  • Stall speed: 62 km/h (39 mph, 33 kn)
  • Rate of climb: 4 m/s (790 ft/min)
  • Wing loading: 59.2 kg/m2 (12.1 lb/sq ft)


  1. Bayerl, Robby; Martin Berkemeier; et al: World Directory of Leisure Aviation 2011-12, page 168. WDLA UK, Lancaster UK, 2011. ISSN 1368-485X
  2. Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015-16, page 158. Flying Pages Europe SARL, 2015. ISSN 1368-485X
  3. Rolandas Kalinauskas (n.d.). "RK-5 "Ruth"". Retrieved 20 December 2012.
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