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viktorradnai / flightgear-ask21

ASK21 glider model for Flightgear
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Aileron has far too high drag #144

Open ghost opened 6 years ago

ghost commented 6 years ago

The aileron drag is so high that it directly decreases vertical speed by ~1m/s, which IMO is far too much, wenn using it (full deflection) along with the spoilers extended, it leads immediately to a decrease in airspeed of up to ~80km/h making the aircraft stall. l'll experiment whether simply decreasing drag="" in the aileron config (FDM) fixes this.

ghost commented 6 years ago

Okay, about the decresing vertical speed, maybe it's actually correct, would have to be checked against the real aircraft in spring :D but the second thing, aileron deflection leading to a stall definetely needs to be fixed, I think this comes from a combination of too high drag from spoiler and maybe quite high drag from ailerons. I already earlier noticed that there's strange interference between FLAP elements and SPOILER elements of yasim wings when trying to model a glider with flaps

viktorradnai commented 6 years ago

I will try to check this when I next fly an ASK21. I have not noticed an increase in the sink rate when using the ailerons, but I had to add this much drag so the adverse yaw seemed correct. Maybe it can be tweaked but only lift and drag seems to be available as tunable parameters, and lift controls the roll rate, which also appears to be about right.