title: Koser KB-3 Jadran
text: # Koser KB-3 Jadran
  
  The Koser KB-3 Jadran was a Slovenian amphibious sailplane designed and produced by LIBIS aircraft during Yugoslavian period. It was designed by Jaroslav Košer, 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.
  
  ## Specifications
  
  Data from The World's sailplanes
  
  General characteristics
  
  * Crew: one
  * Wingspan: 15.0 m (49 ft 3 in)
  * Wing area: 13.25 $m^2$ (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)
  