Lift (force)  From Wikipedia, the free encyclopedia
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Boeing 747-8F landing   Lift is the force generated by
propellers and wings to propel aircraft and keep them in the
air. Birds, bats, insects, fish, flying reptiles, and even
falling plant seeds have usefully exploited lift for millions of
years.   Forces on an airfoil  Lift is most commonly associated
with the wing of a fixed-wing aircraft, although lift is also
generated by propellers, kites, helicopter rotors, rudders,
sails and keels on sailboats, hydrofoils, wings on auto racing
cars, wind turbines and other streamlined objects. Lift is also
exploited in the animal world, and even in the plant world by
the seeds of certain trees. While the common meaning of the word
"lift" assumes that lift opposes weight, lift in its technical
sense can be in any direction since it is defined with respect
to the direction of flow rather than to the direction of
gravity. When an aircraft is flying straight