The first World Championships for the new FAI 15 m racing class took place in 1978 at Chateauroux, France. With the ASW 20 Schleicher also developed an aircraft for this class which now permitted camber-changing flaps with the 15 m span.
Gerhard Waibel used the new ASW 19 fuselage for this aircraft. It was modified in the root region to accept the new flapped wing as well as adding the flap control kinematics.
The ASW 20 L had a 16.6 m span and was in response to the many pilots who wanted to fly with a greater wingspan on weekends or outside of competitions.
The wing bottom surface was modified for the ASW 20 B and C. In addition, the B-version also had increased water ballast capacity which required strengthening of the wing, fuselage and fins.
Technical Data
| Muster / Type | ASW 20 (L) |
| Klasse / Class | FAI 15 m |
| Sitze / Seats | 1 |
| Erstflug / Maiden flight | 27.01.1977 |
| Herstellungszeitraum / Production period | 1977 – 1983 |
| Stückzahl / Number of pieces | 511 |
| Konstrukteuer / Designer | Gerhard Waibel |
| Spannweite / Span | 15.0 m (16.6 m) |
| Rumpflänge / Fuselage length | 6.82 m |
| Höhe / Height | 1.45 m |
| Flügelfläche / Wing area | 10.5 m² (11.05 m²) |
| Flügelstreckung / Wing aspect ratio | 21.43 (24.9) |
| Flügelprofil / Airfoil | FX 62-K-131 mod. / FX 60-126 |
| Leermasse / Empty weight | 255 kg (260 kg) |
| Höchstflugmasse / Max. weight | 454 kg (380 kg) |
| Wasserballast / Water ballast | 120 l (0) |
| Max. Flächenbelastung / Max. wing load | 43.2 kg/m² (34.4 kg/m²) |
| Geringstes Sinken / Min. sink | 0.59 m/s (0.55 m/s) |
| Gleitzahl / Best glide ratio | 42 (45.5) |
| Muster / Type | ASW 20 B (BL) |
| Herstellungszeitraum / Production period | 1983 – 1990 |
| Stückzahl / Number of pieces | 83 |
| Konstrukteuer / Designer | Gerhard Waibel |
| Spannweite / Span | 15.0 m (16.59 m) |
| Flügelfläche / Wing area | 10.5 m² (11.01 m²) |
| Flügelstreckung / Wing aspect ratio | 21.43 (25.02) |
| Flügelprofil / Airfoil | FX62-K-131 mod. / FX60-126 mod. |
| Leermasse / Empty weight | 270 kg (275 kg) |
| Höchstflugmasse / Max. weight | 525 kg (430 kg) |
| Wasserballast / Water ballast | 150 l (100 l) |
| Max. Flächenbelastung / Max. wing load | 50 kg/m² (39 kg/m²) |
| Geringstes Sinken / Min. sink | 0.59 m/s (0.55 m/s) |
| Gleitzahl / Best glide ratio | 43.5 (46) |
| Muster / Type | ASW 20 C (CL) |
| Herstellungszeitraum / Production period | 1983 – 1990 |
| Stückzahl / Number of pieces | 171 |
| Leermasse / Empty weight | 260 kg (265 kg) |
| Höchstflugmasse / Max. weight | 454 kg (380 kg) |
| Wasserballast / Water ballast | 110 l (50 l) |
| Max. Flächenbelastung / Max. wing load | 43.2 kg/m² (34.4 kg/m²) |
| Geringstes Sinken / Min. sink | 0.59 m/s (0.55 m/s) |
| Gleitzahl / Best glide ratio | 43.5 (46) |
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