How Do Airplanes Fly? What Makes an Airplane Fly?

How Do Airplanes Fly? What Makes an Airplane Fly?
Flight is made possible through the application of four essential physical properties and Bernoulli's principal. The four physical properties affecting an aircraft in flight are weight, lift, drag, and thrust.
from: http://ezinearticles.com/?How-Do-Airplanes-Fly?-What-Makes-an-Airplane-Fly?&id=3567210
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