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At a glance
Measured figures
ASK 21 · Length
Single source8.35 m (27 ft 5 in)[source]
Length
Single sourceConfiguration
| Specification | Schleicher ASK 21 | Thai Aviation Industries RTAF-6 |
|---|---|---|
| Type | Two Seater-class Or Club-class sailplane[source]ASK 21 | Trainer aircraft[source] |
| National origin | Germany[source]ASK 21 | Thailand[source] |
| Manufacturer | Alexander Schleicher GmbH & Co[source]ASK 21 | Thai Aviation Industry[source] |
| Designer | Rudolf Kaiser[source] |
8.35 m (27.39 ft)[source]
1 × Allison 250 -B17-D turboprop
Single source1 × Allison 250 -B17-D turboprop , 313 kW (420 hp)[source]
ASK 21 · Wing area
Single source17.95 m 2 (193.2 sq ft)[source]
Service ceiling
Single source7,600 m (25,000 ft)[source]
Bars compare reported quantities only. A larger figure does not make a system better; configurations and test conditions differ.
| — |
| Number built | Over 1000[source]ASK 21 | 3 (2017), 25 reported built[source] |
|---|
| Introduction date | 1979[source]ASK 21 | 2014[source] |
|---|
| First flight | February 1979[source]ASK 21 | 14 June 2012[source] |
|---|
| Aspect ratio | 16:1[source] | — |
|---|
| Airfoil | FX S02-196 / FX 60-126[source] | — |
|---|
| Stall speed | 65 km/h (40 mph, 35 kn)[source] | — |
|---|
| Never exceed speed | 280 km/h (170 mph, 150 kn) in smooth air[source] | — |
|---|
| g limits | +6.5 -4 at 180 km/h (97 kn)[source] | — |
|---|
| Maximum glide ratio | 34 at 90 km/h (49 kn)[source] | — |
|---|
| Rate of sink | 0.64 m/s (126 ft/min) at 67 km/h (36 kn)[source] | — |
|---|
| Wing loading | 33.4 kg/m 2 (6.8 lb/sq ft)[source] | — |
|---|
| Status | — | In service, in production[source] |
|---|
| Primary user | — | Royal Thai Air Force[source] |
|---|
| Manufactured | — | 2014–present[source] |
|---|
| Developed from | — | SIAI-Marchetti SF.260[source] |
|---|
| Hardpoints | — | 4 with a capacity of up to 68 kg (150 lb) on inner, 100 lb (45 kg) on outer[source] |
|---|