Engineering:LAK-12
| LAK-12 | |
|---|---|
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| Role | Open Class sailplane |
| National origin | Lithuania |
| Manufacturer | LAK Sportine Aviacija Sport Aviation USSR |
| First flight | 1986 |
| Status | Production completed |
| Number built | 253 |
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.[1][2]
Design and development
The LAK-12 was designed in the 1980s as an open class racer.[1]
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.[1][3]
Operational history
According to Sportine Aviacija, the current type certificate holder, 253 were manufactured over a twenty-five year production run.[4]
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.[2][5]
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.[6]
Aircraft on display
The sole LAK-12E currently hangs from the ceiling of the Lithuanian Aviation Museum in Kaunas.[7]
Specifications (LAK-12)
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Data from Jane's All the World's Aircraft 1988-89[8]
General 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
References
- ↑ 1.0 1.1 1.2 Activate Media (2006). "LAK-12 Sportina Aviacija". Archived from the original on 3 May 2002. https://web.archive.org/web/20020503071719/http://www.sailplanedirectory.com/PlaneDetails.cfm?planeID=196. Retrieved 26 August 2011.
- ↑ 2.0 2.1 Federal Aviation Administration (10 April 2018). "Make / Model Inquiry Results". http://registry.faa.gov/aircraftinquiry/AcftRef_Results.aspx?Mfrtxt=&Modeltxt=LAK-12&PageNo=1. Retrieved 10 April 2018.
- ↑ Lednicer, David (2010). "The Incomplete Guide to Airfoil Usage". http://www.ae.illinois.edu/m-selig/ads/aircraft.html. Retrieved 1 August 2011.
- ↑ "We are". http://lak.lt/we-are/.
- ↑ Transport Canada (9 May 2017). "Canadian Civil Aircraft Register". http://wwwapps.tc.gc.ca/Saf-Sec-Sur/2/CCARCS-RIACC/RchSimpRes.aspx?cn=%7c%7c&mn=%7cLAK12%7c&sn=%7c%7c&on=%7c%7c&m=%7c%7c. Retrieved 9 May 2017.
- ↑ "Sklandytuvas LAK-12E". https://www.limis.lt/detali-paieska/perziura/-/exhibit/printToPDF/80000000082910?p_p_resource_id=printToPDF&p_p_cacheability=cacheLevelPage&_exhibitPreviewportlet_WAR_limiskportlet_s_ind=26&_exhibitPreviewportlet_WAR_limiskportlet_id=80000000082910&_exhibitPreviewportlet_WAR_limiskportlet_s_id=9xmTSQKLeYq8fwE2.
- ↑ "Sklandytuvas LAK-12E". https://www.limis.lt/detali-paieska/perziura/-/exhibit/printToPDF/80000000082910?p_p_resource_id=printToPDF&p_p_cacheability=cacheLevelPage&_exhibitPreviewportlet_WAR_limiskportlet_s_ind=26&_exhibitPreviewportlet_WAR_limiskportlet_id=80000000082910&_exhibitPreviewportlet_WAR_limiskportlet_s_id=9xmTSQKLeYq8fwE2.
- ↑ John W.R. Taylor, ed (1988). Jane's All the World's Aircraft 1988-89. London: Jane's Information Group. p. 642. ISBN 0-7106-0867-5.
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