LIBIS KB-11
# 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)
