In the MSFS 2024 aircraft selection menu, the ASK 21 glider is in the OTHER category, not in the GLIDER category. So you there is no keybind available for tow/winch release in the control settings. You must release the cable manually in the cockpit with the mouse.
It is not possible, to do a proper winch launch. The rope slows down and the glider will mostly stall… ![]()