German two-seat glider.

Function: designed primarily for beginner instruction, but is also suitable for cross-country flying and aerobatic instruction

Manufacturer: Alexander Schleicher Segelflugzeugbau

Produced: 1979 –

Wingspan: 17 m

Lenght: 8,35 m

Max. takeoff weight: 600 kg

Max. speed: 280 km/h

Glide ratio: 34

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Schleicher ASK 21, reg. OK-8464