Akaflieg Karlsruhe AK-5

The AK-5 is a single-seat club class sailplane designed and built in Germany by members of Akaflieg Karlsruhe.

Akaflieg Karlsruhe AK-5
AK-5 in Neresheim
Role Club class sailplane
National origin Germany
Manufacturer Akaflieg Karlsruhe
First flight June 1990[1]
Number built 1
Developed into Akaflieg Karlsruhe AK-5b

Design and development
AK-5 in the Alps near Timmersdorf

The forward fuselage of the glider was taken from the Glasflügel 604 and the wings were built to the design of the Streifeneder-Hansen Falcon glider, an experimental prototype designed and built by Hansjörg Streifeneder. The cockpit interior was newly designed including a self-designed and built flight director / variometer system and parallelogram control input system similar to Glasflügel practice.[2]

The experience gained while building the new winglets for the AK-8 glider will be used to improve the performance of the AK-5. It is planned to build extensions to the existing wings and to attach winglets.

Specifications

Data from [3]

General characteristics

  • Crew: 1
  • Length: 6.8 m (22 ft 4 in)
  • Wingspan: 15 m (49 ft 3 in)
  • Wing area: 10.66 m2 (114.7 sq ft)
  • Aspect ratio: 21.11
  • Airfoil: HQ-21/17.5
  • Empty weight: 278 kg (613 lb)
  • Gross weight: 485 kg (1,069 lb)

Performance

  • Never exceed speed: 270 km/h (170 mph, 150 kn)
  • Maximum glide ratio: 39:1 at 105 km/h (65 mph; 57 kn)
  • Rate of sink: 0.580 m/s (114.2 ft/min) at 85 km/h (53 mph; 46 kn)
  • Wing loading: 45 kg/m2 (9.2 lb/sq ft)

Avionics

  • self-designed flight director / variometer

References
  1. AK-5 Erstflug Archived 2011-08-17 at the Wayback Machine bei akaflieg-karlsruhe.de
  2. "AK-5" (in German). 11 June 2015. Retrieved 21 September 2016.
  3. "Akaflieg Karlsruhe AK-5". All-Aero. Retrieved 21 September 2016.
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