| 'Schleicher ASK-21' | |
| Seats: | 2 |
| Wingspan: | 17 meter / 55.76 feet |
| Empty Weight: | 360 Kg / 792 lb |
| Payload: | 240 Kg / 528 lb |
| Structure: | Fib-glss sandwich fuselage and tail, fib-glss/foam wing |
| Max Glide Ratio: | 35 @ 46 kts / 53 mph / 85 km/h |
| Minimum Sink: | 0.65 m/s / 2.13 fps @ 36 kts / 41 mph / 67 km/h |
| Stall Speed: | x |
| Maximum Speed: | x |
| G +/-: | x |
| Produced in: | 1979- |