This modern high-performance glider is made by the world renowned Schleicher company in Germany. It is a two-seat training glider in a tandem configuration which means one seat is behind the other. The student pilot sits in the front with the instructor sitting behind. Both pilots have identical cockpits and the glider can be flown from either one. This glider is also fitted with hand controls to provide equality of access for those with a disability of the lower limbs. A hoist of medical standard is available to assist with entry and exit.
The ASK21 has a wingspan of 17 metres (55ft 9in), a top speed of 151 knots (175 mph) and a maximum g-loading of +6.5 and -4. It has a glide ratio of 34:1 meaning for every 34 metres it travels it loses only 1 metre in height! This is the main glider in which students will complete most of their training and in which they will fly solo following successful completion of training.