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What is the trailing edge of an airfoil?

Aft end of airfoil where airflow from above meets airflow from below

Aft end of airfoil where airflow from below meets airflow from above

The trailing edge of an airfoil is the aft end of the airfoil where the airflow from the upper and lower surfaces converges. As air flows over an airfoil, it is divided at the leading edge, where the airfoils' shape begins to generate lift. The air moving over the top of the airfoil generally travels faster than the air moving underneath due to the shape of the airfoil, creating differences in pressure that contribute to lift. As this airflow meets again at the trailing edge, it defines the boundary of the airfoil.

Choosing the correct response reflects an understanding that the trailing edge is specifically defined by where these two streams of airflow come together after circulating around the airfoil. The other potential choices either misplace the focus or incorrectly describe the part of the airfoil relevant to the definition of the trailing edge, which is solely concerned with the interaction of the airflow at the back end.

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Leading edge of airfoil where airflow begins

Middle section of an airfoil

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