Heavier than air flight is possible when lift from stationary or rotating wings overcomes the force of gravity, and thrust from a propeller or turbine blades overcomes the aerodynamic drag created as the aircraft moves through the air. The motion of the propeller or turbine blades that create thrust produces significant noise as they beat the air—noise that is annoying to those who live near busy airports or that can cause an otherwise stealthy drone to be detected. A new MIT airplane...
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