The amount of lift generated by this action-reaction process usually amounts to only about 15 percent of the total lifting force necessary to sustain aircraft flight. In this section, we have concentrated on how airfoils create lift. They make use of Bernoulli's principle and Newton's third law of motion. Airfoils move through the air, creating an interaction between air and airfoils. This interaction takes the form of a difference in pressure between upper and lower surfaces of the airfoil, and the decreased pressure on the upper surface of the airfoil causes lift.
Additional lift comes from the force of the impact air on the airfoil moving through the air.
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