A lot of people think Bernoulli's Principle (moving fluids exert less pressure than static fluids) is true and that it is why planes fly. First, lets make sure it is true:
If we accept Bernoulli's Principle as true, it typically gets applied to flight like this:
But if that were the case, turning the wing upside down would cause planes to drop from the sky incredibly fast (even faster than in free fall). However, this doesn't happen. For instance, planes shouldn't be able to do this:
So what is the problem? Is Bernoulli's Principle true? Is it why planes fly? Does it have nothing to do with planes? Is there something else that also needs to be considered?
four basic aerodynamic forces: lift, weight, thrust and drag. thrust must be equal to or greater than the drag. If, for any reason, the amount of drag becomes larger than the amount of thrust, the plane will slow down. If the thrust is increased so that it's greater than the drag, the plane will speed up.
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