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Reference.org
Drag curve
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<p>The drag curve or drag polar is the relationship between the <a href="/facts/Drag_(physics)/vdl4jF7I">drag</a> on an aircraft and other variables, such as lift, the coefficient of lift, angle-of-attack or speed. It may be described by an equation or displayed as a graph (sometimes called a "polar plot"). Drag may be expressed as actual drag or the coefficient of drag. </p><p>Drag curves are closely related to other curves which do not show drag, such as the power required/speed curve, or the sink rate/speed curve. </p>