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Kazan Aviation Institute BK-7 / LAK-9 Lietuva
 
Kazan-Lak9-01
 
It is believed to have been designed originally by Balys Karvyalis and first flown, under the designation BK-7, in 1972. It had a Wortmann FX-67-K-170 wing section and a retractable monowheel landing gear, with tailskid. The BK-7, which was of glassfibre construction, was subsequently reported to have entered series production and a Polish journal later referred to a 'BK-7A Lietuva' with a wing span of 20 m (65 ft 7.5 in), length of 7.27 m (23 ft 10.25 in), weight of 380 kg (837 lb), best glide ratio of 46 and max speed of 210 km/hr (113 kt).
 
An almost identical aircraft was flown by O. Pasetnik in the Open Class of the June 1976 World Championships in Finland but withdrew from the last two days of the competition because of aileron damage. This aircraft was referred to as the LAK-9 Lietuva and it was reported that the three LAK-9s then built had not, at that time, fully completed flight testing. The LAK-9 is the first Soviet sailplane to compete in the World Championships since 1968.
 
LAK-9 Lietuva
Wing span: 20.02 m / 65 ft 8 in
Length: 7.27 m / 23 ft 10.25 in
Height: 1.53 m / 5 ft 0 in
Wing area: 14.99 sq.m / 161.4 sq ft
Wing section: Wortmann FX-67-K-170
Aspect ratio: 26.8
Empty weight: 380 kg / 838 lb
Max weight 580 kg / 1,278 lb
Water ballast: 100 kg / 220 lb
Max wing loading: 38.69 kg/sq.m / 7.92 lb/sq ft
Max speed: 121 kt / 225 km/h
Stalling speed: 35 kt / 64 km/h
Min sinking speed: 0.51 m/sec / 1.67 ft/sec at 40 kt / 74 km/h
Max rough air speed: 113 kt / 210 km/h
Best glide ratio: 48 at 55.5 kt / 103 km/h
 
Kazan-Lak9-02
 
 
 
 
 


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