Koser KB-3 Jadran

The Koser KB-3 Jadran was a Yugoslavian amphibious sailplane. It was designed by Jaroslav Koser, a student at the Ljubljana Technical Faculty (Tehniška fakulteta v Ljubljani) of the University of Ljubljana and was a development of his earlier Koser-Hrovat KB-1 Triglav design.[1][2][3]

Jadran
Role Amphibious sailplane
National origin Yugoslavia
Manufacturer Branko Ivanus
Designer Jaroslav Koser
First flight 1949-50

Design and development


Specifications

Data from The World's sailplanes[2]

General characteristics

  • Crew: one
  • Wingspan: 15.0 m (49 ft 3 in)
  • Wing area: 13.25 m2 (142.6 sq ft)
  • Aspect ratio: 17
  • Airfoil: Göttingen Gö 549
  • Empty weight: 195 kg (430 lb)
  • Gross weight: 280 kg (617 lb) maximum

Performance

  • Maximum speed: 200 km/h (120 mph, 110 kn) placard
  • Maximum glide ratio: 25 at 75 km/h (47 mph; 40 kn)
  • Rate of sink: 0.75 m/s (148 ft/min) minimum, 60 km/h (37 mph; 32 kn)
  • Aerotow maximum speed: 150 km/h (93 mph; 81 kn)

References
  1. Organisation Scientifique et Technique Internationale de Vol a Voile3 eme Congres Internationale Orebro. Sweden. 1950, by rd. August Raspet. Engineering Research Station, Mississippi State College
  2. Wilkinson, K.G.; Brooks, Peter; Shenstone, B.S. (1958). The World's Sailplanes - Die Segelflugzeuge der Welt - Les Planeurs de le Monde (in English, German, and French). I. Organisation Scientifique et Technique International de Vol à Voile (OSTIV) & Schweizer Aero-Revue. pp. 196–200.
  3. KB-3 Jadran
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