Schleicher ASK 13
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| Type designation | ASK 13 / Ka-13 |
| Competition class | N/A |
| Number built | 700+ |
| Crew | 2 |
| Length | 8.18 |
| Height | 1.60 |
| Wingspan | 16.00 m |
| Wing area | 17.50 m² |
| Aspect ratio | 14.6 |
| Wing profile: | Göttingen 535/549 |
| Empty mass | ca. 290 kg |
| Water ballast | N/A |
| Maximum mass | 480 kg |
| Maximum wing loading | kg/m² |
| Maximum speed | 200 km/h (108 kts) |
| Rough air speed | 140 km/h (76 kts) |
| Stall speed | 50 km/h (33 kts) |
| Minimum sink rate | ca. 0.81 m/s (160 ft/min) |
| Best glide ratio | 28 at 90 km/h (48.5 kts) |
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.
[edit] History and characteristics
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 Schleichers. 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.
[edit] External links
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