Question

The drag due to the pressure distribution around the wing is

• A. skin-friction drag
• B. wave drag
• C. form drag
• D. profile drag

Hint:

Form drag is shape-dependent; streamlined forms reduce it effectively.

Answer 1

The Correct Option is C

The problem involves understanding the types of drag forces acting on an aircraft wing due to pressure distribution and selecting the correct type of drag. Here is the explanation of each type of drag provided in the options:

• Skin-friction drag: This drag is caused by the friction of air flowing over the surface of the wing. It's primarily due to the viscous nature of air and is not directly associated with pressure distribution.
• Wave drag: This is a type of drag that occurs at transonic and supersonic speeds, caused by the shockwaves forming around the aircraft, rather than pressure distribution around the wing.
• Form drag: Also known as pressure drag, it results directly from the pressure distribution around the wing. The shape of the aircraft affects this type of drag significantly. It arises because of the difference in pressure between the front and rear sides of the wing.
• Profile drag: This is a combination of skin-friction drag and form drag.

Based on the definition and characteristics of each drag type, the drag due to pressure distribution around the wing is best identified as form drag.