It’s actually quite interesting, it’s the shape of the airplane wings.
The top of the wing is more curved meaning the air has to travel a farther distance, whereas the bottom part is flatter so the air has to travel a smaller distance to get around the wing.
They both reach the other side at same time so that means the air on top is moving much faster than the air on the bottom.
Faster moving fluids have less pressure than slower moving fluids (according to bernoulli’s) principle. This pressure gradient causes a force on the wings that push upwards creating lift.
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If the pilot wants to go higher, he will tilt the wing upwards, this will even greater increase the pressure difference between top and bottom so more lift. If he doesn’t want to go higher, he will make it so the wing is at the perfect angle such that it perfectly counteracts the force of gravity and you stay stable in the air.
however if the wing tilts too high, the air never makes it across and instead creates vortexes that cause turbulence and eventually the plane stalls and starts falling down.
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I think we need good understanding of the theory behind the motor as somalia skipped this crucial 'age'. U can set up wings n paper plane or kite even but doesn't have the same stability and angles as a plane or jet fighter or drone. We have gaps in 'motor' theory. This is a fundamental area our students need to master.