Schleicher ASK 13

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The ASK 13 is a two-seater glider that was built by Alexander Schleicher. It was and still is widely used for "ab-initio" training of glider pilots.

In 1965 Rudolf Kaiser continued development of the two-seated Ka 2 and Schleicher Ka 7 by introducing the ASK 13. It uses a mixture of materials, including metal, wood and glassfibre. It has swept-forward single-spar wings were positioned lower than in the Ka 7 which allowed for a large blown canopy and so a good all-round view for both pilots.

The 6° forward sweep of the wing allows the rear pilot to be seated near the centres of gravity and lift. The glider therefore behaves in the same way when it is flown dual and solo. The D-type leading edge torsion box is of plywood and the whole wing is fabric-covered. There are metal Schempp-Hirth air brakes above and below the wing, and the wooden ailerons are fabric-covered. The fuselage is a welded steel tube structure with spruce stringers and fabric-covered overall, except for the nose, which is glassfibre. The tail unit is plywood-covered, except for the rear part of the rudder and elevators, which are fabric-covered, and there is a Flettner trim tab in the starboard elevator.

Landing gear consists of a non-retractable sprung wheel, mounted aft of the centre of gravity. Originally there was a skid under the forward fuselage but many K13s now have a nose wheel.

It first flew in prototype form in July 1966 and by January 1978 a total of approximately 700 ASK 13s had been built by Schleicher. They are superb training gliders because they stall and spin well but these manoeuvres are easy to recover from. Their construction also gives them great strength and yet they are easily repairable.

The aircraft was succeeded by the ASK 21.

pecifications

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crew=Two
capacity=
length m=8.18
length ft=26
length in=10
span m=16.00
span ft=52
span in=6
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width m=
width ft=
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height m=1.6
height ft=5
height in=3
wing area sqm=17.5
wing area sqft=188
swept area sqm=
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rot area sqm=
rot area sqft=
volume m3=
volume ft3=
aspect ratio= 14.6
wing profile= Göttingen 535/549
empty weight kg=290
empty weight lb=640
gross weight kg=480
gross weight lb=1,060
lift kg=
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max speed kmh=200
max speed mph=125
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glide ratio= 28
climb rate ms=
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sink rate ms= 0.81
sink rate ftmin= 160

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References

* [http://www.alexander-schleicher.de/ Schleicher Web Site]
* [http://www.sailplanedirectory.com/ Sailplane Directory]