I think I understand how airplane wings create lift when taking off, but I can’t wrap my head around how they stay in the air once they reach cruising altitude.
My understanding of how wings work during takeoff is: by changing the wing’s angle of attack, air molecules under the wing are deflected down, in turn creating lift on the wing. And air molecules that go over the wing are not met with that resistance from the wing, so they move faster than the molecules underneath, creating a pressure difference which also helps generate lift.
But when the airplane reaches cruising altitude, the wings seem pretty much horizontal, so it seems the angle of attack is not nearly as large as it was during takeoff. So at that point how do the wings generate enough lift to stay in the air?
Thank you
Edit: I’m studying mechanical engineering and have taken a fluid mechanics class so I have a little bit of background knowledge, but am still having a hard time understanding this
In: 3
The wings of a plane are actually angled so when the body of the aircraft is level with the ground, the angle of attack isn’t 0°. Otherwise, how would you get a plane off the runway? Sure they angle the plane up after its lifted off the runway to get up in the air, but how else would they get off the ground in the first place? Also, when the plane is up in the air, it’s moving much faster than it is on the runway, so it doesn’t need as harsh an angle of attack to get the same amount of lift because lift depends on velocity as well as angle of attack.
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