How much do you really know about stalls?

1. 1) What happens when you increase the angle of attack past the angle at which the maximum coefficient of lift occurs?
   

   The airfoil will stall.

   The airfoil will stall.

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2. 2) Adding flaps increases the ________ of the airfoil, which produces more _______ and delays airflow separation at _____ angles of attack on the airfoil.
   

   Adding flaps increases the curvature/camber of the airfoil. This produces more lift and delays airflow separation caused at high angles of attack.

   Adding flaps increases the curvature/camber of the airfoil. This produces more lift and delays airflow separation caused at high angles of attack.

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3. 3) There is a _________ found on the top of an airfoil when air is forced to move from __________ to ____________. At high angles of attack, loss of energy to the boundary layer can create ________.

   The adverse pressure gradient forces air molecules to flow from low pressure to high pressure. As the angle of attack is increased, the boundary layer will lose its energy, and the adverse pressure gradient will take over causing the air molecules located in the high-pressure region to flow back to the low-pressure region causing airflow separation. 

   The adverse pressure gradient forces air molecules to flow from low pressure to high pressure. As the angle of attack is increased, the boundary layer will lose its energy, and the adverse pressure gradient will take over causing the air molecules located in the high-pressure region to flow back to the low-pressure region causing airflow separation. 

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4. 4) You're on a checkride and your examiner asks you: "For a given configuration, your airfoil will always stall at the same what?" You tell them...

   An airfoil will always stall at the same angle of attack, which is known as the critical angle of attack.

   An airfoil will always stall at the same angle of attack, which is known as the critical angle of attack.

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5. 5) Which of these designs do aircraft manufacturers use to stall the inboard section of an airfoil first?
   

   Aircraft manufacturers often develop airfoils with wing twist, stall strips, cuffed wings, or a combination of all three.

   Aircraft manufacturers often develop airfoils with wing twist, stall strips, cuffed wings, or a combination of all three.

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