How do wings generate lift when flying upside down?
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Air moves around a wing, the design makes sure the air underneath serves as a cushion with more pressure and the air above as a lesser one but not entirely as a void, you still need some air pressure above the wing so it’s not constantly forcing the wing to up with speed and make the controller struggle to keep it where it’s intended to be.
When it’s upside down, the control surfaces still work albeit not as well as the air is meant to be slipping as easily from that side.
We’ve had a basic knowledge of aerodynamics for centuries so even in early wing design with powered flight the wings already had a shape meant to differentiate air pressure influence but you can still find in some models in the RC plane community where the wings are identical top and bottom and they’ll have similar control flying either direction.
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