在低雷诺数条件下，对于纯俯仰运动，随着翼型厚度的减小，平均阻力系数也变小。
For pure pitching motion, the results show that average drag coefficient decreases as airfoil thickness is reduced.
超音速飞机的长窄三角翼型设计是美观实用原则的代表，极度的流线型设计对于将阻力降到最低是必要的。
The long narrow delta shape of supersonic aircraft is an example of aesthetic functionalism, an extreme form of streamlining that is essential to minimize drag.
由于前缘涡的影响，翼型厚度增加，平均压差阻力系数变小，甚至会出现负值。
As airfoil thickness is increased, the average pressure drag, affected by leading edge vortex is reduced even to be negative, and meanwhile friction has little increase.
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