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Bernoulli's Principle

Bernoulli's Principle. What is that?. It explains why and airplane gets lift It explains why a curve ball curves It can impress your friends. Theory of Flight. Aerodynamics Bernoulli principle

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Bernoulli's Principle

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  1. Bernoulli's Principle What is that? • It explains why and airplane gets lift • It explains why a curve ball curves • It can impress your friends

  2. Theory of Flight • Aerodynamics • Bernoulli principle • “As the air velocity increases, the pressure decreases; and as the velocity decreases, the pressure increases.” • A major part of the knowledge base needed in the design and development of aircraft. • Contributed to the work of G.B. Venturi, an Italian scientist, who first noted the effects of constricted channels on the flow of fluids. A round tube, such as a nozzle or jet engine, designed to increase the speed of flowing gases and liquids is called a venturi.

  3. Why a curve ball curves? • What do the laces do? • What does faster/slower rotation do? • Demonstrate?

  4. Theory of Flight • The four forces in balance with one another hold the plane in the air. • The four forces are lift, weight, thrust, and drag.

  5. Video Demonstration • Video Presentation / Bernoulli’s Principle

  6. The Four Forces of Flight • According to the Bernoulli Principle, there is an increase in the velocity of air as the airflow around an airfoil shape; therefore, there is an increase of the relative wind as it flows above and below the surface of the airplane wing.

  7. The Four Forces of Flight • Lift can be increased in two ways 1. Increasing the forward speed of the airplane. (Increase Relative Wind) 2. Increase the angle of attack. • The pilot can increase the forward speed of the aircraft by applying more power (Thrust).

  8. The Four Forces of Flight • Angle of Attack • The sum of all the tiny forces over the surface of the wing is called the resultant.

  9. The Four Forces of Flight • Angle of Attack • The angle at which lift stops increasing and begins to decrease is called the burble point.

  10. The Four Forces of Flight • Airfoil Shape • It is extremely important to preserve the characteristic curve that the designers built into the airfoil. • Dents, mud, and ice are three common things that can spoil the built-in shape of the airfoil and interfere with the performance of the entire aircraft.

  11. The Four Forces of Flight • Wing Area and Lift • The greater the surface area of the wing, the greater the amount of lift that will be generated. • Gliders and sailplanes are very good examples of how a large wing surface generates lift.

  12. Summary • As air velocity increases, pressure decreases • As velocity decreases, pressure increase • Pressure increase creates lift • Curveball is a ball adjusting to pressure • Bernoulli principle major part of wing design

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