Hello, only for your information: The 15m flapped sailplane ASW-20 was converted from UIUC to JSBSim and considerably further developed. Focus was on the FDM. The cockpit still needs some improvement but all necessary instruments are available. Features are: - accurate speed polar 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. I tried to incorporate a lot of this data into the 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! Best regards D-NXKT
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