- Source: LAK-12
The LAK-12 is a Lithuanian mid-wing, single-seat, FAI Open Class glider that was designed and produced by Lietuviškos Aviacinės Konstrukcijos (LAK) (English: Lithuanian Aircraft Builders) in Lithuania and later by Sportine Aviacija and Sport Aviation USSR.
Design and development
The LAK-12 was designed in the 1980s as an open class racer.
The aircraft is made from fibreglass, foam and carbon fibre. Its 20.42 m (67.0 ft) span foam-core wing employs a Wortmann FX67-K-170 airfoil at the wing root, transitioning to a FX67- K-150 section at the wing tip. The wings feature both double-panel upper surface air brakes and flaps that can be set to -7°, -4°, 0°, +5°, +11° and +15°. Water ballast is 190 L (50 US gal) held in the wing leading edges and dumped through a centre-fuselage valve. The landing gear is a single retractable monowheel suspended by an oil/nitrogen oleo, plus a tailskid. The cockpit canopy is of one-piece and forward hinged.
Operational history
According to Sportine Aviacija, the current type certificate holder, 253 were manufactured over a twenty-five year production run.
In April 2018 there were 17 LAK-12s listed on the United States Federal Aviation Administration registry, all single-place and certified in the Experimental - Racing/Exhibition category and three registered with Transport Canada in the Limited Class.
Variants
LAK-12 Lietuva
20.42 m (67.0 ft) span open-class sailplane.
LAK-12 Lietuva 2R
Two-seat version of the LAK-12 with tandem cockpit in an extended fuselage.
LAK-12E
Experimental 25.5 m (83.7 ft) span variant built in 1988 and tested in 1988 and 1989, incorporating boundary control via blowholes on the lower surface. Only one produced.
Aircraft on display
The sole LAK-12E currently hangs from the ceiling of the Lithuanian Aviation Museum in Kaunas.
Specifications (LAK-12)
Data from Jane's All the World's Aircraft 1988-89General characteristics
Crew: one
Length: 7.23 m (23 ft 9 in)
Wingspan: 20.42 m (67 ft 0 in)
Height: 1.92 m (6 ft 4 in)
Wing area: 14.63 m2 (157.5 sq ft)
Aspect ratio: 28.5:1
Airfoil: Root: Wortmann FX67-K-170, tip: FX67- K-150
Empty weight: 360 kg (794 lb)
Max takeoff weight: 650 kg (1,433 lb) with ballast
Water ballast: 190 L (50 US gal; 42 imp gal)
Performance
Stall speed: 65 km/h (40 mph, 35 kn)
Never exceed speed: 250 km/h (160 mph, 130 kn) in smooth air
Max aero-tow speed: 140 km/h (76 kn; 87 mph)
g limits: +6 -3
Maximum glide ratio: 47:1
Best glide speed: 95 km/h (51 kn; 59 mph)
Rate of sink: 0.48 m/s (94 ft/min) *Minimum sink speed: 75 km/h (40 kn; 47 mph)
Wing loading: 44.42 kg/m2 (9.10 lb/sq ft) max
See also
Aircraft of comparable role, configuration, and era
Schempp-Hirth Nimbus-2
ASW-17
Related lists
List of gliders
References
External links
Kata Kunci Pencarian:
No More Posts Available.
No more pages to load.
