Schleicher ASK 18

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ASK 18
ASK18-JSZ.jpg
ASK18 at Camphill, Derbyshire 2011
Role Club class sailplane
National origin Germany
Manufacturer Schleicher
Designer Rudolf Kaiser
First flight October 1974
Number built 56

The Schleicher ASK 18 is a single-seat sailplane that was built by the German manufacturer Alexander Schleicher GmbH & Co. It was designed to be a sturdy aircraft for inexperienced solo pilots and so uses a simple and rugged construction and has docile handling characteristics.

Design[edit]

The ASK 18 was designed by Rudolf Kaiser and was the last Schleicher glider to use the traditional construction method, at a time when contemporary aircraft of the same class, such as the Grob G-102 Astir, were made of glass-fibre. The fuselage was derived from the Ka 8 and used welded steel tube and spruce longerons. It is covered in fabric. The wings are from the Ka 6E but with 16-metre span. They have a single wooden spar. The rear part of the wing is fabric-covered and the ailerons are plywood-covered. The tailplane came from the K 10; the fin and tailplane are plywood-covered and the rudder and elevators are fabric covered. A Flettner trim tab is fitted to the elevator. Only the nose cone is glass-fibre. The main-wheel is fixed and has a brake. There is a tail-skid but no nose-skid. The Schempp-Hirth airbrakes extend above and below the wing. First flight was in October 1974.

A variation was the ASK 18B which had a span reduced to 15m. At the end of production in 1977 38 K18s and 9 K18Bs had been built by Schleicher and one unknown variant built from a kit. A further 8 K18-ARs were produced in Argentina.

Specifications[edit]

ASK 18 launching at Camphill

General characteristics

  • Crew: One
  • Length: 6.00 m (19 ft 8 in)
  • Wingspan: 16.00 m (52 ft 6 in)
  • Height: 1.68 m (5 ft 6 in)
  • Wing area: 13.0 m2 (140 ft2)
  • Aspect ratio: 19.7
  • Wing profile: Root: NACA 633-618 Mid: NACA 633-614 (with Wortmann leading edge modification)
  • Empty weight: 215 kg (473 lb)
  • Gross weight: 335 kg (737 lb)

Performance

  • Maximum speed: 200 km/h (125 mph)
  • Maximum glide ratio: 34
  • Rate of sink: 0.62 m/s (122 ft/min)

See also[edit]

Related lists

References[edit]

Gliders and Sailplanes of the World by Michael Hardy Ian Allan Ltd 1982 ISBN 0-7110-1152-4

External links[edit]