ORIGINAL: BMatthews
Ah, but while with washout the stall may be more abrupt this is a far better state of affairs than to have the tips stall first. A ''nice'' stall is where the center section stalls first and the tips, that keep the plane stable through the sort of stall manage to hang on bitterly so you still maintain control rather than falling off to one side or the other.
Yeah I know that very well, that's what I always loved the good old single-engine Cessnas for. They have less taper, the same airfoil thickness near the tips (and uncambered or later models the drooped nose), and don't need that much washout, though.
ORIGINAL: BMatthews
Deploying flaps around the center not only increases the camber of the area with the flaps but it also severly shifts the angle of attack of the flapped section in a positive way. In effect it results in extreme washout but makes the plane more stable by doing so.
That's what I meant in my former posts. But at least in the simulator that doesn't cure the problem, still don't know why. I could try it in QFLR5 when I have some time.
ORIGINAL: BMatthews
Granted a lot has to do with each designer's ideas but I'd rather see a healthy amount of washout and avoid the tips stalling before the rest of the wing.
So even 3 degrees of washout aren't healthy because still the tips stall first, even the whole outer wing at once. I could try 6 degrees washout, we'll see. A different airfoil might be better, though, and not really perceivable on a scale model.