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Notizen:
The effect of these silk flaps is quite impressive.
The diagram depicts the lift coefficient over the angle of attack.
The red curve is the one for the aerofoil without flaps and you notice the characteristic drop in lift generation beyond the critical angle.
The blue curve shows several things:
First, while the flaps are not lifted off, they do not have a negative effect on the lift generation (about their effect on the drag I will tell you in a second).
Then, when increasing the angle of attack beyond its critical value, the lift generation does NOT drop but even increases further a little bit.
