Designed by an amateur design group. The Konstrukeijski Letalskt Zveze Slovenije, comprising students of the Ljubljana Technical High School, the KB-6 Matajur flew for the first time on 4 June 1952.
The first prototype Matajur was powered by a 136 hp Regnier 4 L00 engine, but the second prototype and production aircraft have been powered by the 160 hp Walter Minor engine.
It was produced in quantity by the Letov factory at Ljubljana.
Engine: Regnier 4L00, 136 hp
Wing span: 34 ft 9 in
Length: 27 ft 5 in
Height: 7 ft 1 in
Empty weight: 1453 lb
Loaded weight: 2159 lb
Max speed: 138 mph at SL
Cruise: 124 mph
ROC: 689 fpm
Service ceiling: 14,800 ft
Seats: 2
Engine: 160 hp Walter Minor 6-III
Wing span: 34 ft 9 in
Wing area: 150.7 sq.ft
Length: 27 ft 5 in
Height: 7 ft 1 in
Empty weight: 1453 lb
Loaded weight: 2185 lb
Max speed: 138 mph at SL
Cruise: 114 mph
ROC: 699 fpm
Range: 441 mi
Seats: 2
All Aero 