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4 forces of flight Have you ever looked up at an airplane and given any thought to the forces that keep it moving and in the air There are four forces that keep an airplane in the air they are lift weight thrust and drag The combination of these helps an airplane sustain flight The most important of these aerodynamic forces is lift Without lift the airplane could not stay in the air Lift is created when the camber curvature of an airfoils upper surface makes the air flowing over it moves faster than the air flowing under the wing This increase in velocity reduces the pressure on the top of the wing so lift is produced This is known as Bernoullis Principle This principle is so named because Daniel Bernoulli a Swiss scientist discovered it Jeppesen Every airfoil no matter what its camber or chord will lose its smooth flow at some point along the upper surface The regular airfoil has turbulence somewhere forward of the trailing edge even though level flight is maintained With every increase in the angle of attack this turbulent flow moves closer forward to the leading edge This is true up to a point because one must also consider the power need to move the aircraft through the air With unlimited power angle of attack would be no problem however this is not the situation Therefore the turbulent flow continues forward until there is no more lift and gravity takes command This is called a stall Levy The air can no longer flow smoothly over the wings upper surface Instead the air burbles over the wing and lift is lost The angle of attack can be positive neutral or negative A positive angle of attack means the wing is slanted upward Therefore the aircraft sufficiently powered is climbing A neutral angle of attack means the aircraft is sustaining level flight neither ascending nor descending A Negative angle of
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