LIBIS KB-11

KB-11 Branko
Role	Four-seat light trainer and tourer
Manufacturer	LIBIS aircraft (Letalski inštitut Branko Ivanuš Slovenija)
First flight	1959

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 m² (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)

References

• Taylor, John W. R (1961). Jane's All The World's Aircraft 1961–62. London: Sampson Low, Marston & Company.
• Green, William (1962). Observer's book of aircraft (1962 ed.). London: Frederick Warne & Co. Ltd.
• The Illustrated Encyclopedia of Aircraft (Part Work 1982–1985). Orbis Publishing.