Schleicher ASK 21

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Schleicher ASK 21
Type Glider aircraft
Propulsion Unpowered aircraft
Manufacturer Schleicher
  • Heiko Schulz (original version)
  • AJ MacLeod (original version)
  • Thomas Polzer
  • Viktor Radnai
  • Bea Wolf
  • Gilberto Agostinho
--aircraft= ask21


Status Production
 FDM Stars-4.png
 Systems Stars-4.png
 Cockpit Stars-4.png
 Model Stars-4.png
 Website The website for the Schleicher ASK 21 developments.
 Repository The development repository of the Schleicher ASK 21.
Download Download the Schleicher ASK 21 aircraft package for the current stable release (2020.3).
License GPLv2+
Wikipedia Schleicher ASK 21 This is a link to a Wikipedia article

The Schleicher ASK 21 is a modern glass-reinforced plastic two-seater glider with a mid-set wing and a mass balanced T-tail. The ASK 21 is designed primarily for beginner instruction, but is also suitable for cross-country flying and aerobatic instruction.

The ASK 21 is a suggested aircraft for the Pinzgauer Spaziergang.

Aircraft help

Key Function
Ctrl+w Place winch in front of aircraft, hook in and start winch launch
W Increase winch speed
w Decrease winch speed
Ctrl+o Find aircraft for aerotow and hook in
o Open both hooks (pulls the yellow lever)
Ctrl+b Toggle battery master switch
Ctrl+t Toggle turn coordinator switch
S Turn up vario volume
s Turn down vario volume
Ctrl+s Start/stop smoke (for aerobatics)
Helper functions
u Show current QNH and current pressure
Q Show current wind data

Some data good to know

Data based on flight manual [1]

MTOW 600 kg (1322 lbs)
Vne 280 kmh (151 kts) never exceed
VB 200 kmh (107 kts) max speed in gusty winds, like in Cb clouds or overflying mountain ridges
VM 180 kmh (97 kts) max maneuver speed
VT 180 kmh (97 kts) max aerotow speed
VT 150 kmh (80 kts) max winch tow speed

Maximal G-Forces (at 180kmh/97kts): +6,5 -4,0
Maximal crosswind : 15kmh (8kts!)

Getting into the sky

  • You can use the winch
  • You can use an ai aerotow (ASK21-menu / Drag robot)
  • You can be towed by multiplayer aircraft

Screenshot Gallery


Version 1.0

This is the first updated version pushed to FGAddon by Thomas Polzer, Viktor Radnai and Bea Wolf. It includes livery support, new pilot models, improvements to the interior, the menu and the FDM. It was released on 3rd January 2017.

Version 2.0

In the second updated version V. Radnai and B. Wolf improved the instruments, wind sounds, systems and usability as well as the interior further. It was released on 18th February 2017.

Version 3.0

With the help of Gilberto Agostinho, this version will feature very much improved textures as well as a realistic-looking fuselage shader and various other improvements/fixes. It was released on 25th March 2017.

Version 4.0

This version contains a highly reworked fuselage/interior model and many bug fixes. It was released on 9 May 2017

Version 5.0

This version contains a new JSBSim FDM for the glider and the motorglider variant. Additional changes are an updated radio and an improved Fuel/Payload dialog. It was released on 27th August 2019.

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