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Aerodynamics

Aerodynamics. Lab 6A. Airfoil Terminology. Angle of Attack. Lift and Drag. Lift is defined as a force normal to the relative wind Drag is a force parallel to the relative wind. How is Lift Produced ?. Air moving over the top of the wing has a higher velocity than the air on the bottom

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Aerodynamics

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  1. Aerodynamics Lab 6A Winter Quarter

  2. Airfoil Terminology Winter Quarter

  3. Angle of Attack Winter Quarter

  4. Lift and Drag • Lift is defined as a force normal to the relative wind • Drag is a force parallel to the relative wind Winter Quarter

  5. How is Lift Produced ? • Air moving over the top of the wing has a higher velocity than the air on the bottom • High Velocity = Low Pressure • Low Velocity = High Pressure • The resulting pressure difference causes a force that pushes up on the wing (aka lift) Winter Quarter

  6. How Angle of Attack and Camber Affect Lift Winter Quarter

  7. What About a Symmetric (no camber) Airfoil? Winter Quarter

  8. Bottom Line: Cambered Vs Symmetric • Cambered airfoils produced lift at zero angle of attack. • Symmetric (no camber) airfoils do not produce lift at zero angle of attack Winter Quarter

  9. What Happens to an Airfoil when it Stalls ? • Flow over the top surface separates from the airfoil, resulting in a high pressure wake region Winter Quarter

  10. Sources of Additional Airfoil Information • How Airplanes work:http://www.howstuffworks.com/airplane4.htm • NASA’s FoilSim II airfoil simulation program:http://www.grc.nasa.gov/WWW/K-12/airplane/foil2.html • Airfoil Database (Hint: look at low Reynolds number airfoils for the upcoming lab) :http://www.aae.uiuc.edu/m-selig/ads/coord_database.html Winter Quarter

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