That's a terribly oversimplified explanation. May I recommend this one instead: https://www.nasa.gov/sites/default/files/atoms/files/foam_wing_k-12.pdf https:

That's a terribly oversimplified explanation. May I recommend this one instead: https://www.nasa.gov/sites/default/files/atoms/files/foam_wing_k-12.pdf https://www.nasa.gov/sites/default/files/atoms/files/foam_wi... When learning about flight, keep asking yourself "Then how do planes fly upside down?" Any explanation which does not mesh with sustained, inverted flight is oversimplified to the point of uselessness and inaccuracy.