The 1950 LF-109 Pionyr two seat glider later was licenced to the Soviet Union.

Length: 25.492 ft / 7.77 m
Wingspan: 44.193 ft / 13.47 m
Aspect ratio: 9.0
Wing area: 217.433 sq.ft. / 20.2 sq.m
Max take off weight: 970.2 lb / 440.0 kg
Weight empty: 551.3 lb / 250.0 kg
Max. payload: 419.0 lb / 190.0 kg
Max. speed: 76 kt / 140 km/h
Landing speed: 30 kt / 55 km/h
Cruising speed: 33 kt / 62 km/h
Wing load: 4.51 lb/sq.ft / 22.00 kg/sq.m
Glide ratio: 18.0
Crew: 2

The Czech aerobatic glider LF-107 Lunak was designed by Rudy Letov and further developed by a group of sailplane pilots and aeronautical engineers. The first flight of the prototype took place on June 25, 1948 and a second prototype flew in July. The prototype participated later in the same year in an aerobatic competition in Grenchen, Switzerland, and in Ziar, Poland in 1949, where its good aerobatic and gliding characteristics drew considerable attention.

Unfortunately the serial production was disrupted by geopolitical developments, as the factory was charged with production of MiG-15, MiG-19 and MiG-21F aircraft and the access to Western civil export markets was progressively hampered by the emergence of the Iron Curtain. Therefore, only 75 examples of the Luňák were produced in all. Production models were used in local clubs for sailing and aerobatics as well as for training jet pilots.

In 1950, a variant with simpler construction and a revised cockpit, among other changes, was developed. This LF-107 Luňák of wooden construction, designated Letov VT-7 under the military training system, was instrumental in the development of gliding and aerobatics in the Czech Republic. The LF-107 was also used for aerobatic training in the Soviet Union, Bulgaria, Romania and Poland.

The Letov XLF-207 Laminar, a derivative of the Luňák, holds the distinction of being the first glider in the world to have a laminar flow wing. Its maiden flight took place in Praha Letnany in August 1951. Research into laminar flow wings was carried out by the XLF-207 Laminar, a LF-107 fitted with laminar flow wings.

In 1990 there were only nine airworthy Luňák, of which two are in the United Kingdom. A Luňák is displayed in the American Museum of Flight.

LF-107 Luňák
Length: 6.78 m
Height: 1.47m / 5ft
Wingspan: 14.27 m
Wing area: 13.38 sq.m
Aspect ratio: 15.22
Empty weight: 205 kg
Gross weight: 310 kg
Maximum speed: 300 km/h
Maximum glide ratio: 24 @ 80km/hr (43kts)
Rate of sink: @ 65km/hr 0.85 m/s (@ 35kts 167 ft/min)
Crew: 1

VT-7

XLF-207 Laminar