Schleicher ASW 20

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ASW 20 sailplane
ASW 20 in landing configuration (JSBSim)
ASW 20 in landing configuration (JSBSim)
Type Glider aircraft
Propulsion Unpowered aircraft
Manufacturer Schleicher
  • Michael Selig
  • Roland Stuck (3D)
  • D-NXKT
--aircraft= asw20
Status Early production
 FDM Stars-4.png
 Systems Stars-4.png
 Cockpit Stars-2.png
 Model Stars-3.png
 Website The website for the ASW 20 sailplane developments.
 Repository The development repository of the ASW 20 sailplane.
Download Download the ASW 20 sailplane aircraft package for the current stable release (2020.3).
License GPLv2+

Development status/Issues/Todo



  • flaps are not animated
  • rudder, ailerons and pitch elevator are not animated
  • top of the wings are not textured - aircraft has no shadow
  • landing gears are not animated when retracting/lowering them
  • model is taken from MSFS. FG does not support .mdl

3d Cockpit:

  • 3d cockpit is not available


  • sailplane seems to have an inbuild engine, but that one is not visible or can't be deployed (there's also no bay doors for the engines)
  • no hud available


The 15m flapped sailplane ASW 20 was converted from UIUC to JSBSim and considerably further developed. Focus was on the FDM.

Features are:

  • accurate speed polars for all five flap positions
  • good stall characteristics
  • tailspin
  • weight and balance
  • water ballast
  • rain impact on performance
  • ground effect
  • wing failure
  • wing bending
  • correct control surface deflections
  • checklists

The original flight manual, speed polars and other valuable data of the ASW 20 is publicly available on the internet. A lot of this data is incorporated into this model (performance and handling). For the next development steps, fine tuning, the feedback of real life ASW 20 pilots is necessary.

To give an example:
In the flight manual you'll find this passage: "Even in stalled flight attitude (the vario will read 1,5 to 2 m/s sink in calm air, that is 300 to 400 feet per min.) ailerons and rudder work in the usual manner, as long as only half control deflections are applied. Full control deflections result in light wing dropping, whereas full deflected controls in opposite directions with stick pulled completely back will cause rapid wing dropping."

Try it out yourself!

ASW20 on a nice summer day Wing View ASW 20 ASW20 circling

External links

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