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Schleicher ASK 21

Two Seater-class Or Club-class sailplane

Schleicher ASK 21 is a two Seater-class Or Club-class sailplane originating in Germany. It was built by Alexander Schleicher GmbH & Co.

Origin: Germany
Manufacturer: Alexander Schleicher GmbH & Co

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Length: 8.35m
Height: 1.55m
Mass: 600kgMaximum take-off
Crew: 1

Technical data

Specifications

19 fields · 1 source · retrieved 1 Oct 2026

Dimensions & mass

Length: 8.35 m (27 ft 5 in)¹
Wingspan: 17 m (55 ft 9 in)¹

True scale

Size in context

Length: 8.35 m
Height: 1.55 m
Person: 1.75 m

Sourced dimensions beside a 1.75 m human reference.

Height

1.55 m (5 ft 1 in)¹

Wing area

17.95 m 2 (193.2 sq ft)¹

Empty weight

360 kg (794 lb)¹

Max takeoff weight

600 kg (1,323 lb)¹

Performance

Crew: 1 student, 1 instructor¹
Stall speed: 65 km/h (40 mph, 35 kn)¹
Never exceed speed: 280 km/h (170 mph, 150 kn) in smooth air¹
Rate of sink: 0.64 m/s (126 ft/min) at 67 km/h (36 kn)¹
Wing loading: 33.4 kg/m 2 (6.8 lb/sq ft)¹

Programme

Designer: Rudolf Kaiser¹ASK 21
Number built: Over 1000¹ASK 21
Introduction date: 1979¹ASK 21
First flight: February 1979¹ASK 21
Aspect ratio: 16:1¹
Airfoil: FX S02-196 / FX 60-126¹
g limits: +6.5 -4 at 180 km/h (97 kn)¹
Maximum glide ratio: 34 at 90 km/h (49 kn)¹

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Sources & original excerpts1 reference

Schleicher ASK 21 · Wikipedia revision 1372986619 ↗
Type
Infobox (ASK 21) · Type
Two Seater-class Or Club-class sailplane
National origin
Infobox (ASK 21) · National origin
Germany
Manufacturer
Infobox (ASK 21) · Manufacturer
Alexander Schleicher GmbH & Co
Designer
Infobox (ASK 21) · Designer
Rudolf Kaiser
Number built
Infobox (ASK 21) · Number built
Over 1000
Introduction date
Infobox (ASK 21) · Introduction date
1979
First flight
Infobox (ASK 21) · First flight
February 1979
Crew
Specifications (ASK 21) · Crew
1 student, 1 instructor
Length
Specifications (ASK 21) · Length
8.35 m (27 ft 5 in)
Wingspan
Specifications (ASK 21) · Wingspan
17 m (55 ft 9 in)
Height
Specifications (ASK 21) · Height
1.55 m (5 ft 1 in)
Wing area
Specifications (ASK 21) · Wing area
17.95 m 2 (193.2 sq ft)
Aspect ratio
Specifications (ASK 21) · Aspect ratio
16:1
Airfoil
Specifications (ASK 21) · Airfoil
FX S02-196 / FX 60-126
Empty weight
Specifications (ASK 21) · Empty weight
360 kg (794 lb)
Max takeoff weight
Specifications (ASK 21) · Max takeoff weight
600 kg (1,323 lb)
Stall speed
Specifications (ASK 21) · Stall speed
65 km/h (40 mph, 35 kn)
Never exceed speed
Specifications (ASK 21) · Never exceed speed
280 km/h (170 mph, 150 kn) in smooth air
g limits
Specifications (ASK 21) · g limits
+6.5 -4 at 180 km/h (97 kn)
Maximum glide ratio
Specifications (ASK 21) · Maximum glide ratio
34 at 90 km/h (49 kn)
Rate of sink
Specifications (ASK 21) · Rate of sink
0.64 m/s (126 ft/min) at 67 km/h (36 kn)
Wing loading
Specifications (ASK 21) · Wing loading
33.4 kg/m 2 (6.8 lb/sq ft)