Form Drag Illustration Comparing Air Flows Around Various Shapes
: The image compares the air flow around the following shapes (all having the same frontal area): a flat plate, a sphere, a sphere with a back fairing, and a sphere inside a streamlined housing. They are ordered from the shape generating the highest form drag (the flat plate) to the lowest. Notice the air flow (i.e. the swirl) around each shape.
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