Originally Posted by
tcasdescend
Read it but did not understand.
Based on the bernouli principle, the upper wing is curved which leads to more air molecules going across compared to bottom wing.This is higher velocity and lower pressure.
If the alieron is deflected up, wouldnt it lead to higher velocity and lower pressure just like a curved wingtip?
Fold some paper to make a wing shape and experiment. You’ll see the up going aileron makes the upper surface of the wing less curved.
The increase in drag from the wing with the down going aileron is due to induced drag - basically the drag caused by the lift. The downward deflected aileron has increased the lift. Drag is a by-product of lift, so more lift means more drag.
This isn’t a precise definition so anyone please correct me if required.
In a long winged, slow flying aircraft like a glider, simply moving the stick to one side will create so much drag on that side that the nose will swing in the opposite direction, (this is adverse yaw.) so rudder input is needed to prevent this.