LIBIS KB-11

KB-11 Branko
Role	Four-seat light trainer and tourer
Designer	Letalski Institut Branko Ivanus Slovenija
First flight	1959

The LIBIS KB-11 Branko was a 1950s Yugoslavian four-seat monoplane designed by Letalski Institut Branko Ivanus Slovenija.

Design and development

The aircraft design office of the Letalski Institut Branko Ivanus 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. Intended for use as an air-taxi our business use but only small numbers were built.

Specifications (KB-11)

Data from Observer's Book of Aircraft 1962^[1]

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) ^[2]
• Aspect ratio: 7.76:1^[2]
• Airfoil: NACA 3415 at root, USA 35B at tip^[2]
• 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; 116 kn (133 mph) at sea level
• Cruise speed: 171 km/h; 92 kn (106 mph) at 1,525 m (5,000 ft) and 75% power
• Stall speed: 98 km/h; 53 kn (61 mph) ^[2]
• Range: 950 km (590 mi; 513 nmi) ^[2]
• Service ceiling: 5,334 m (17,500 ft)
• Rate of climb: 4.3 m/s (850 ft/min)

Notes

1. Green 1962, pp. 142–3
2. Taylor 1961, p. 358.

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.

See also