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406.05 Lift

406.05 Lift. 40 mins OCdt Marleau. Bernoulli’s Principle. An increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy. Angle of Attack. As the angle of attack increases, what happens to lift?. Lift Increases .

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406.05 Lift

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  1. 406.05 Lift 40 mins OCdt Marleau

  2. Bernoulli’s Principle • An increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.

  3. Angle of Attack • As the angle of attack increases, what happens to lift? Lift Increases • As the angle of attack increases, what happens to drag? Drag Increases

  4. Airflow Over a Wing

  5. Lift and Drag Curves Page 2F-1 in your 242

  6. Lift/Drag Ratio • The coefficient of lift and the coefficient of drag depend on the shape of the airfoil and the angle of attack. Lcoefficient of lift D coefficient of drag

  7. Airfoil A surface designed to obtain a reaction from the air through which it moves. (2 dimensional) Airfoil – 2D Wing – 3D

  8. Relative Airflow • The direction of the airflow with respect to the wing. • It is created by the movement of the airplane as well as the movement of air. • Relative airflow is usually opposite to the flight path.

  9. Angle of Attack • The angle at which the airfoil meets the relative airflow.

  10. Center of Pressure

  11. Functions of Airfoils • Create lift • Create thrust • Attachment point for the control surfaces (including flaps, slots, slats, etc) • House fuel tanks and instrument components • Stability

  12. What We Have Learned • Bernoulli’s Theorem • Variation of Lift and Drag with A of A • Lift/ Drag Ratio • Relative Airflow and Angle of Attack • Pressure Distributions • Functions of Airfoils

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