Schleicher ASH 25

The ASH 25 is a two-seater high performance Open Class glider manufactured by Alexander Schleicher from 1986 until September 2008, originally with a 25 metre wingspan. It was superseded in production by the ASH 30.

ASH 25
Role Open Class sailplane
National origin Germany
Manufacturer Schleicher
Designer Martin Heide
First flight 1986
Produced 1986-2004[1]
Number built 266[2]
Developed from Schleicher ASW 22

Design and development

In 1984, designer Martin Heide (the 'H' in the type designation) combined the wing of the World Championship winning single-seater Schleicher ASW 22[3] with a fuselage derived from the Akaflieg Stuttgart fs31 which had particularly low drag. The prototype was designated AS 22-2.[4]:2[5] The span was increased in later versions to 25.6 or 26 metres with winglets.

A 'turbo' version was also developed, the ASH 25E, followed by the self-launching ASH 25 Mi with a large retractable propeller and a Wankel engine.

Variants
ASH 25
A 25m Open class glider, 25.6m or 26m wingspan when fitted with option winglets.
ASH 25E
Self-sustaining version with a 24 hp Rotax 275 engine
ASH 25M
Self-launching version with a 60 hp AE50R engine. Both the ASH 25 and ASH 25E can be converted to the ASH 25M by the manufacturer.
ASH 25 Mi
Self-launching version with a 60 hp IAE50R-AA engine. The ASH 25, ASH 25E and ASH 25M can be converted to the ASH 25Mi by the manufacturer.
ASH 25J
Self-launching version with a jet engine
ASH 25EB
Self-launching version with a Rotax 535C engine, 27m wingspan and one-piece canopy
ASH 25EB/28
Self-launcher with one-piece canopy and 28m wingspan

Specifications (with 25.6 metre wings)

Data from Specifications for ASH 25 / ASH 25 Mi[4]:4

General characteristics

  • Crew: 2
  • Length: 8.97 m (29 ft 5 in)
  • Wingspan: 25.6 m (84 ft 0 in)
  • Height: 1.7 m (5 ft 7 in)
  • Wing area: 16.5 m2 (178 sq ft)
  • Aspect ratio: 39.8
  • Airfoil: root:HQ 17; tip:DU 84-132/V3
  • Empty weight: 478 kg (1,054 lb)
  • Max takeoff weight: 750 kg (1,653 lb)
  • Water ballast: 120 l (32 US gal; 26 imp gal)

Performance

  • Never exceed speed: 280 km/h (170 mph, 150 kn)
  • Maximum glide ratio: ca. 60:1
  • Rate of sink: 0.42 m/s (83 ft/min)

See also

Related lists

References
  1. "ASH 25 (english)". Alexander Schleicher GmbH & Co. Segelflugzeugbau. Retrieved 30 October 2019.
  2. "Dipl.-Ing. Martin Heide has retired". Alexander Schleicher GmbH & Co. Segelflugzeugbau. 28 June 2018. Retrieved 1 January 2019. ..was manufactured by Schleicher in a number of versions for almost 20 years, productions was stopped in 2004 with serial number 266
  3. Johnson, Richard (May 1988). "A Flight Test Evaluation of the ASH 25" (PDF). Soaring. New Mexico, USA: Soaring Society of America, Inc. Archived from the original (PDF) on April 11, 2003. Retrieved 3 August 2014. ...the single seated ASW-22 from which the ASH-25 was derived.
  4. "Specification ASH 25 / ASH 25 Mi (english)" (PDF). Alexander Schleicher GmbH & Co. Segelflugzeugbau. July 2003. Archived from the original (PDF) on 23 January 2015. Retrieved 3 August 2014.
  5. "AS 22-2 (english)". Alexander Schleicher GmbH & Co. Segelflugzeugbau. Retrieved 27 September 2019.

Further reading
  • Simons, Martin (2005). Sailplanes 1965–2000 (2nd revised ed.). Königswinter: EQIP Werbung und Verlag G.m.b.H. ISBN 978-3-9808838-1-8.
  • Thomas, Fred (November 5, 1999). Milgram, Judah (ed.). Fundamentals of sailplane design (3rd ed.). College Park, MD: College Park Press. ISBN 978-0966955309.


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