title: LIBIS KB-11
text: # LIBIS KB-11
  
  The LIBIS KB-11 Branko was a 1950s Slovenian four-seat monoplane designed and produced by LIBIS aircraft during Yugoslavian period.
  
  ## Design and development
  
  The aircraft design office of the LIBIS aircraft (Letalski Inštitut Branko Ivanuš Slovenija) brought together teachers and students of the Ljubljana technical high school. The KB-11 Branko was a development of the earlier two-seat KB-6 Matajur. First flown in December 1959 the KB-11 was an all-metal cantilever low-wing monoplane with retractable tricycle landing gear and an enclosed heated and ventilated cockpit for four persons. It was intended for use as an air-taxi or for business use but only small numbers were built.
  
  ## Specifications (KB-11)
  
  Data from Observer's Book of Aircraft 1962
  
  General characteristics
  
  * Crew: 1
  * Capacity: 4 total
  * Length: 8.23 m (27 ft 0 in)
  * Wingspan: 10.59 m (34 ft 9 in)
  * Height: 2.45 m (8 ft 0 in)
  * Wing area: 1.152 $m^2$ (12.40 sq ft)
  * Aspect ratio: 7.76:1
  * Airfoil: NACA 3415 at root, USA 35B at tip
  * Empty weight: 800 kg (1,764 lb)
  * Gross weight: 1,250 kg (2,756 lb) normal loaded without tip tanks
  * Powerplant: 1 × Lycoming O-435-1 6-cylinder horizontally opposed, 138 kW (185 hp)
  
  Performance
  
  * Maximum speed: 214 km/h (133 mph, 116 kn) at sea level
  * Cruise speed: 171 km/h (106 mph, 92 kn) at 1,525 m (5,000 ft) and 75% power
  * Stall speed: 98 km/h (61 mph, 53 kn)
  * Range: 950 km (590 mi, 510 nmi)
  * Service ceiling: 5,300 m (17,500 ft)
  * Rate of climb: 4.3 m/s (850 ft/min)
  