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1

Only simple flaps can be flaperons. Fowler and double-slotted flaps generally used on large aircraft cannot move upward, and are designed to extend slowly, which is more appropriate for their complexity and fairly large effect. But that's opposite of what you need in aileron, which must react quickly and using bigger deflection up than down is desirable to ...


4

This flaperon is actually the high speed aileron. Using the outer ailerons at high speed will twist the wing, which in turn reduces their effectiveness. For every aileron there exists a speed where it becomes ineffective and above that speed its function will even be reversed. See the flexible wing as a flap in its own and the aileron as its Flettner tab of ...


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