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It doesn't? I normally make every effort to fly my airplane through the air
"head-on". Granted, it's possible to fly through the air in a wide range of
attitudes, but "head-on" is the most efficient and is what most pilots use
for normal, straight-and-level flight.
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Your fuselage may be "head-on", but your wings aren't. The relative wind is coming from below. It's impossible to fly straight & level while the wing is head-on - you need lift to maintain level flight.
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Only because of the resulting slip. Which is what several people have been
trying to point out already, including Jose (in his latest post).
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Yes, and I am pointing out that this is not the main correcting force. Slip is a secondary factor, and takes a finite amount of time to develop.
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Ignoring gravity (as Jose suggested), if you take an airplane flying
straight and level and bank it, all that changes is the net lift vector, and
all that changing that will do is change the direction of flight. It will
do nothing to return the airplane's attitude back to straight and level.
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No, the AOA of the higher wing will be lower, due to the change in angle of the relative wind, as I have been saying all along. Besides, ignoring gravity pretty much changes everything in the equation.
You can draw the angles on a piece of paper, to help visualize it. If the angle of the wings is different (i.e. dihedral) then the AOA of the upper wing will get lower, and the AOA of the low wing will increase the closer it gets to horizontal. Past horizontal, the low wing will start to develop less lift as well, but the high wing will lose it faster.