1. Fundamentals of Engineering for Honors – ENG H192 Lab 4: Aerodynamics

2. Fundamentals of Engineering for Honors – ENG H192 Airfoil Terminology

3. Fundamentals of Engineering for Honors – ENG H192 Angle of Attack

4. Fundamentals of Engineering for Honors – ENG H192 Lift and Drag Lift is defined as a force normal to the relative wind Drag is a force parallel to the relative wind

5. Fundamentals of Engineering for Honors – ENG H192 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)

6. Fundamentals of Engineering for Honors – ENG H192 How Angle of Attack and Camber Affect Lift

7. Fundamentals of Engineering for Honors – ENG H192 What About a Symmetric (no camber) Airfoil ?

8. Fundamentals of Engineering for Honors – ENG H192 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

9. Fundamentals of Engineering for Honors – ENG H192 What Happens to an Airfoil when it Stalls ? Flow over the top surface separates from the airfoil, resulting in a high pressure wake region

10. Fundamentals of Engineering for Honors – ENG H192 Sources of Additional Airfoil Information How Airplanes work: http://www.howstuffworks.com/airplane4.htm http://www.howstuffworks.com/airplane4.htm NASA’s FoilSim II airfoil simulation program: http://www.grc.nasa.gov/WWW/K- 12/airplane/foil2.html 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 http://www.aae.uiuc.edu/m- selig/ads/coord_database.html