Engineering:URMV-3 IS-2

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IS-2
Role Sailplane
National origin Romania
Manufacturer URMV-3[1]
Designer Iosif Șilimon[1]
First flight 14 August 1950 [1]

The IS-2 was an intermediate training glider designed by Iosif Şilimon and built in Romania in the 1950s at the URMV-3 (Rom: Uzinele de Reparatii Material Volant-3 - Glider repair and manufacture factory) factory at Brașov.[1]

Design and development

The IS-2 was designed as an intermediate training glider. Construction was largely of wood with fabric and plywood skinning, similar o the Grunau Baby pre-war German glider.[1] Very little is known of the IS-2s development or operational history. Of conventional configuration with high-set cantilever wings and cruciform tail-unit, the IS-2 was also flown with an increased span wing.[2]

Specifications (IS-2)

Data from The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II[2]

General characteristics

  • Crew: 1
  • Length: 6.54 m (21 ft 5 in)
  • Wingspan: 12.3 m (40 ft 4 in)
  • Height: 1.05 m (3 ft 5 in) at cockpit
  • Wing area: 14.7 m2 (158 sq ft)
  • Aspect ratio: 10.3
  • Airfoil: Root:Göttingen 535, Mid Göttingen 535, Tip Göttingen 676
  • Empty weight: 152 kg (335 lb)
  • Gross weight: 250 kg (551 lb)

Performance

  • Stall speed: 42 km/h (26 mph, 23 kn)
  • Never exceed speed: 180 km/h (110 mph, 97 kn) *Rough air speed max: 130 km/h (81 mph; 70 kn)
  • Aerotow speed: 110 km/h (68 mph; 59 kn)
  • Winch launch speed: 80 km/h (50 mph; 43 kn)
  • Terminal velocity: with full air-brakes at max all-up weight 180 km/h (112 mph; 97 kn)
  • g limits: +4 -2.2 at 185 km/h (99.9 kn)
  • Maximum glide ratio: 20 at 69 km/h (43 mph; 37 kn)
  • Rate of sink: 0.77 m/s (152 ft/min) at 32.9 mph; 28.6 kn (53 km/h)
  • Wing loading: 17 kg/m2 (3.5 lb/sq ft)

See also

Aircraft of comparable role, configuration and era

Related lists List of gliders

Notes

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Gudju, Ion; Gheorghe Iacobescu; Ovidiu Ionescu (1974). Romanian Aeronautical Constructions 1905-1974. Bucharest. 
  2. ↑ 2.0 2.1 Shenstone, B.S.; K.G. Wilkinson (1963) (in English, French, German). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 178–179. 

References

  • Shenstone, B.S.; K.G. Wilkinson (1963) (in English, French, German). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 178–179. 
  • Gudju, Ion; Gheorghe Iacobescu; Ovidiu Ionescu (1974). Romanian Aeronautical Constructions 1905-1974. Bucharest. 



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