URMV-3 IS-2

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]

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

• Grunau Baby
• Slingsby Cadet
• Slingsby Kirby Tutor

Related lists List of gliders