Skin friction on the fuselage is classified as which type of drag?

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Multiple Choice

Skin friction on the fuselage is classified as which type of drag?

Explanation:
Parasite drag is the portion of total drag that does not contribute to lift, and skin friction on the fuselage is a viscous component within that category. The air sticks to the fuselage surface and a thin boundary layer develops; the shear forces in this layer produce a drag force along the flow, known as skin friction drag. This is not caused by pressure differences around the body (that would be form drag) and it is not related to lift-producing effects (which create induced drag). Together, skin friction, along with form and interference drag, makes up parasite drag.

Parasite drag is the portion of total drag that does not contribute to lift, and skin friction on the fuselage is a viscous component within that category. The air sticks to the fuselage surface and a thin boundary layer develops; the shear forces in this layer produce a drag force along the flow, known as skin friction drag. This is not caused by pressure differences around the body (that would be form drag) and it is not related to lift-producing effects (which create induced drag). Together, skin friction, along with form and interference drag, makes up parasite drag.

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