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Lak-17

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Lak-17

LAK-17
Role 15 metre-class and 18 metre-class sailplane
National origin Lithuania
Manufacturer Sportinė Aviacija

The LAK-17 is a Lithuanian single-seat sailplane designed at the Lithuanian Aero Club - (LAK - Lietuviškos Aviacinės Konstrukcijos), and manufactured by Sportinė Aviacija.

Design and development

LAK-17bt fuselage and engine

The LAK-17 is designed to meet the requirements of the utility category of JAR-22.[1] It is a single-seat mid-wing sailplane of composite construction with a T-tail and flaps, it has a retractable single-wheel main landing gear and has airbrakes on the upper wing surface.[1] The airfoil is a combination of the LAP92-130/15, at its roots, and the LAP-92-150/15, at its tips.[2] The LAK-17 holds water ballast in tanks in the wing and fin.[1] The LAK-17A was certified in November 1994 by the Lithuanian Civil Aviation Authority.[1] A new variant with an improved wing was designated the LAK-17B.[3] All variants have a 15.00 m (49.21 ft) wingspan but a wing with span increased to 18.00 m (59.06 ft) is available as an option; powered self-sustaining versions are also produced.[1][3]

An optional Front Electric Sustainer variant was developed for the LAK-17 by Slovenian engineers at LZ Design, it originally had a 0.9 metre propeller, and the latest versions have 1.0 metre propeller, in the nose driven by an electric motor.[4][5]

Variants

LAK-17A
Production flapped 15- or 18-metre wingspan sailplane.[6]
LAK-17AT
Powered self-sustaining sailplane variant of the LAK-17A with a Solo 2350 two-cylinder air-cooled two-stroke retractable engine.[1]
LAK-17A FES
A LAK-17A with a Front Electric Sustainer.[4]
LAK-17B
Improved variant with new wing profile and modified geometry.[3]
LAK-17BT
Powered self-sustaining sailplane variant of the LAK-17B with a Solo 2350 retractable engine.[3]
LAK-17B FES
A LAK-17B with a Front Electric Sustainer.[5]

Specifications (LAK-17A with 15 metre wingspan)

Data from [3][7]

General characteristics
  • Crew: 1
  • Capacity: 188 kg (414 lb) water ballast
  • Length: 6.53 m (21 ft 5 in)
  • Wingspan: 15.00 m (49 ft 2 in)
  • Height: 1.29 m (4 ft 3 in)
  • Wing area: 9.06 m2 (97 ft2)
  • Aspect ratio: 24.63
  • Empty weight: 245 kg (540 lb)
  • Gross weight: 500 kg (1102 lb)

Performance

  • Maximum speed: 275 km/h (171 mph)
  • Maximum glide ratio: 45
  • Rate of sink: 0.53 m/s (104 ft/min)

See also

Related lists

References

Notes

  1. ^ a b c d e f European Aviation Safety Agency Type Certificate Data Sheet A.083
  2. ^ [1]
  3. ^ a b c d e LAK-17B
  4. ^ a b Front Electric Sustainer
  5. ^ a b LAK-17 FES
  6. ^ LAK-17A
  7. ^ [2]

External links

  • LAK
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