Schleicher ASK 13

Schleicher ASK 13
Type:	Glider
Design country:	BR Germany
Manufacturer:	Alexander Schleicher GmbH & Co
First flight:	July 1966
Production time:	1966-1980
Number of pieces:	693 (of which 90 under license)

The Schleicher ASK 13 is a two-seater glider in mixed construction as a middle - wing version with a cross tail for training and performance flight training . Her soaring index is 78.

history

The ASK 13 was developed as the successor to the extremely successful K 7 and 618 units were built by Schleicher until 1980, and another 80 machines were manufactured under license until 1992.

On April 25, 1972, Dr. Siegfried Baumgartl and Walter Schewe from the Luftsportverein Dinslaken eV set a world record for two-seater target flight with a flight over 714 km from Dinslaken / Schwarze Heide airfield to Angers in France.

construction

Tubular steel hull of an ASK 13

Dashboard of a Schleicher ASK 13

The ASK 13 is designed as a middle decker. The fuselage consists of a fabric-covered tubular steel construction and, in contrast to the K 7, has a sprung landing gear in combination with a skid or a nose wheel. The plexiglass cockpit canopy is one-piece and also enables excellent all-round visibility from the rear seat. The wing and tail unit are made of wood, the horizontal tail unit is mounted on the fuselage with two bolts and one screw in front of the fin. The negatively swept wing is similar to that of the K 7, but has a modified profile of less thickness in the middle and outer area, inside a mixed profile of Gö  535 and Gö 549 (thickness 16%), in the middle the same profile (thickness 13.4 %) and outside a Gö 541 (thickness 11.3%). This improved the best glide to 1:27 (K 7 1:25). In addition to the usual center of gravity coupling for winch launch, the ASK 13 has a nose coupling for the F-tow . The center of gravity coupling is mounted to the left of the runner. With a curb weight of less than 300 kg, the ASK 13 is one of the lightest two-seater gliders.

Thanks to the robust and largely maintenance-free construction, the ASK 13, unlike the usual two-seaters from the time such as the SZD-9 Bocian or the L-13 Blanik , has no operating time limit , so that specimens with over 13,000 flight hours and over 50,000 take-offs can be found.

Flight characteristics

The ASK 13 is extremely good-natured, but in contrast to its successor, the ASK 21 , it can spin without an additional trim lead . That is why it is still used today for the two-seat safety briefing in training.

The ASK 13 has been approved for simple aerobatics (looping, turn, lazy eight, no torn figures, no inverted flight) since July 1969.

use

This article or the following section is not adequately provided with supporting documents ( e.g. individual evidence ). Information without sufficient evidence could be removed soon. Please help Wikipedia by researching the information and including good evidence.

An ASK 13 shortly before the start

Launch of an ASK 13 at Albstadt-Degerfeld airfield

Although its successor - the ASK 21  - is now predominantly used in training, 264 units of the ASK 13 are still in training at many gliding clubs and schools, mostly together with the tried and tested - and still widespread - single-seaters K 8 and Ka 6 , which are very similar to the ASK 13 in flight characteristics. Because of its good all-round visibility, the ASK 13 is also often used for guest flights.

Technical specifications

An ASK 13 (left) in the aircraft tow behind a three-axis controlled microlight aircraft

ASK 13 (right) aerotow on the airfield Günterode / Heiligenstadt

Parameter	Data
span	16 m
Wing area	17.5 m²
Wing extension	14.63
Hull length	8.18 m
Cockpit seat height	1.1 m
Cockpit width (clear width)	0.70 m
Height at the tail	1.45 m
Wing profile	Mixed profile Gö 535 / Gö 549
Largest load multiple	−2.0 g / + 4.0 g
Empty weight with minimum equipment	approx. 296 kg
Max. Take-off mass	480 kg
Wing loading (85 kg perm.)	21.7 kg / m²
Wing loading (190 kg allowance)	27.7 kg / m²
Front cockpit payload	65-100 kg
Rear cockpit payload	0-100 kg
Top speed	200 km / h
Minimum speed (single seat)	53 km / h
Maneuver speed	140 km / h
Dive brakes exit	up to 200 km / h
slightest sinking	0.75-0.80 m / s at 60-68 km / h
best gliding (75-85 km / h)	27

See also

• List of aircraft types

literature

• Peter F. Seliger: Rhön-Adler. 75 years of Alexander Schleicher glider construction. Publisher RG Fischer, Frankfurt a. M. 2003.
• Richard and Monique Ferrière: Les Planeurs et Motoplaneurs d 'Alexander Schleicher 1951–1981. Motorbuch-Verlag, Stuttgart 1988, ISBN 3-613-01190-5 .

Web links

Commons : ASK 13  - collection of pictures, videos and audio files

• Alexander Schleicher GmbH & Co. Glider construction. In: alexander-schleicher.de. Alexander Schleicher, accessed March 23, 2009 . 
• ASK 13 (3-side view). In: alexander-schleicher.de. Alexander Schleicher, accessed March 24, 2009 . 
• Sigi Baumgartl and Walter Schewe on their flight to Angers in the 1970s. Retrieved June 22, 2009 . 

Individual evidence

1. ↑ Maintenance manual, change of control cables every 4 years, operating time of 3000 hours
2. ↑ Maintenance manual, operating time 3750 flight hours
3. ↑ http://www.alexander-schleicher.de/wp-content/uploads/2015/03/130_TM04_D.pdf TM4 simple aerobatics
4. ↑ ASK 13: data. In: alexander-schleicher.de. Alexander Schleicher, accessed March 24, 2009 .