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IS 4 Jastrząb

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Wingspan
  
12 m

First flight
  
December 1949

Length
  
6.25 m

IS-4 Jastrząb samolotypolskiepl IS4 quotJastrzbquot

Oldgliders is 4 jastrz b 1 3


The IS-4 Jastrząb (Instytut Szybownictwa – gliding institute) was a single-seat aerobatic glider designed and built in Poland from 1949.

Contents

IS-4 Jastrząb OldGliders Modele RC IS4 Jastrzb

Development

IS-4 Jastrząb httpsuploadwikimediaorgwikipediacommonsthu

The IS-4 was built for aerobatics with a high structural strength and a very high maximum speed which could not be achieved in a vertical dive. Due to the pilot's sitting position and the arrangements of the controls, it was difficult for pilots to exceed the 8g loading limit. During high speed flight it was possible for the air-brakes to be sucked out violently, so most pilots ensured that they remained closed by holding the airbrake control.

Variants

IS-4 Jastrząb FileIS4 Jastrzb 39SP138339 14350726061jpg Wikimedia Commons

  • IS-4 Jastrząb – two prototypes built in 1949.
  • IS-4 Jastrząb bis – Thirty-five production aircraft, three of which were exported.

    • Specifications (IS-4 Jastrząb bis)

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

    General characteristics

    IS-4 Jastrząb Polish Aviation Museum Cracow

  • Crew: 1
  • Length: 6.25 m (20 ft 6 in)
  • Wingspan: 12 m (39 ft 4 in)
  • Height: 1.3 m (4 ft 3 in) at cockpit
  • Wing area: 12 m2 (130 sq ft)
  • Aspect ratio: 12
  • Airfoil: Root – NACA 2418, Tip – NACA 2412, Mid – NACA 0012
  • Empty weight: 240 kg (529 lb)
  • Gross weight: 357 kg (787 lb)

    • Performance

  • Stall speed: 67 km/h (42 mph; 36 kn)
  • Never exceed speed: 450 km/h (280 mph; 243 kn)
  • Rough air speed max: 200 km/h (124.3 mph; 108.0 kn)
  • Aerotow speed: 200 km/h (124.3 mph; 108.0 kn)
  • Winch launch speed: 150 km/h (93.2 mph; 81.0 kn)
  • g limits: +7 -4 at 200 km/h (124.3 mph; 108.0 kn)
  • Maximum glide ratio: 20.2 at 87 km/h (54.1 mph; 47.0 kn)
  • Rate of sink: 1.04 m/s (205 ft/min) at 70 km/h (43.5 mph; 37.8 kn)
  • Wing loading: 29.7 kg/m2 (6.1 lb/sq ft)

    • References

    IS-4 Jastrząb Wikipedia
    (Text) CC BY-SA


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