Discussion
Match each body in List I with the drag component that dominates it in List II.
List I
A. A flat plate aligned with the flow
B. A circular cylinder in crossflow
C. A well-streamlined strut
D. A parachute canopy
List II
1. Almost entirely pressure drag from a very broad wake
2. Almost entirely skin friction
3. Pressure drag, from separation near the shoulder
4. Mostly skin friction, with a modest pressure contribution
Select the correct match.
Answer: D
The sequence traces the whole range from a body that never separates to one designed to separate as violently as possible. Where a given shape falls on that scale is largely a question of how gently its rear allows the pressure to recover.
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