Just watched a documentairy on the BBC about the history of power. Was an interesting bit about the steam engine. People used it for 200 years before they understood the theory.
Nowadays we take the theory for fact and we forget to check the theory afterwards.
Same with the plane. For years scientist thought that the wind over a wing created a vacum beneath the wing. This vacum would generate lift. Recently that theory has been ditched. A wing just bends air, the direction on the bending results in an opposite
force (lift). That's why at slower speeds they extend flaps to make the wing bend the air even further.
Theory is all good and well, but practise is what we deal with on a day to day basis.
Oh good. That whole "makes the air go faster over the top" thing never made much sense to me.