In 1986 Walter Binder started to look into the feasibility of using a small 1-cylinder Rotax 275 engine as a retriever motor for the ASH 25.
Hans-Werner Grosse received the first ASH 25 E in 1987.
Technical Data
| Muster / Type | ASH 25 E |
| Klasse / Class | Offene Klasse / Open class |
| Sitze / Seats | 2 |
| Erstflug / Maiden flight | Mai 1987 |
| Herstellungszeitraum / Production period | 1987 – 1994 |
| Stückzahl / Number of pieces | 65 |
| Konstrukteuer / Designer | Martin Heide |
| Spannweite / Span | 25.0 / 25.6 / 26 m |
| Rumpflänge / Fuselage length | 9.0 m |
| Höhe / Height | 1.67 m |
| Flügelfläche / Wing area | 16.31 / 16.46 / 16.62 m² |
| Flügelstreckung / Wing aspect ratio | 38.32 / 39.82 / 40.67 |
| Flügelprofil / Airfoil | HQ 17-14,8 / DU 84-132 V3 |
| Leermasse / Empty weight | 530 / 538 / 544 kg |
| Höchstflugmasse / Max. weight | 750 kg |
| Wasserballast / Water ballast | 120 l |
| Max. Flächenbelastung / Max. wing load | 46 / 45.6 / 45.1 kg/m² |
| Geringstes Sinken / Min. sink | 0.42 m/s |
| Gleitzahl / Best glide ratio | >57 / ~60 / ~60 |
| Motor / Engine | Rotax 275 |
| Motor-Art / Engine type | 1-Zylinder-2-Takt |
| Startleistung / Take-Off-Power | 24 PS / 17.6 Kw |
| Propeller | mt-Propeller |
| Durchmesser / Diameter | 1.3 m |
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