The LAK-17 is a Lithuanian single-seat sailplane that was designed at the Lithuanian Aero Club ( or LAK), and is manufactured by Sportinė Aviacija. Design and development The LAK-17 is designed to meet the requirements of the utility category of JAR-22. 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. The airfoil is a combination of the LAP92-130/15, at its roots, and the LAP-92-150/15, at its tips. The LAK-17 holds water ballast in tanks in the wing and fin. The LAK-17A was certified in November 1994 by the Lithuanian Civil Aviation Authority. A new variant with an improved wing was designated the LAK-17B. All variants have a wingspan but a wing with span increased to is available as an option; powered self-sustaining versions are also produced. An optional front electric sustainer engine 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 a 1.0 metre propeller in the nose driven by an electric motor. Variants LAK-17A Production flapped 15- or 18-metre wingspan sailplane. LAK-17AT Powered self-sustaining sailplane variant of the LAK-17A with a Solo 2350 two-cylinder air-cooled two-stroke retractable engine. LAK-17A FES A LAK-17A with a front electric sustainer. LAK-17B Improved variant with new wing profile and modified geometry. LAK-17BT Powered self-sustaining sailplane variant of the LAK-17B with a Solo 2350 retractable engine. LAK-17B FES A LAK-17B with a front electric sustainer. LAK-17C FES Improved variant with aerodynamic changes as well as a raised undercarriage to provide increased ground clearance for the folding propeller and increased battery capacity for self launching. Specifications (LAK-17A with 15 metre wingspan) References External links 1990s Lithuanian sailplanes Electric aircraft LAK aircraft