| 1. | Downwind the extra skin friction draft, allowing for greater versatility when gunkholing.
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| 2. | Thus, although the skin friction is increased, overall drag is decreased.
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| 3. | Skin friction is caused by viscous drag in the boundary layer around the object.
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| 4. | Skin friction follows the drag equation and rises with the square of the velocity.
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| 5. | It also creates the greatest skin friction pressure loss.
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| 6. | At speeds below critical mach, one of the primary forms of drag is skin friction.
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| 7. | This is due to the skin friction between the lift air and the ground below it.
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| 8. | This gives low skin friction, which is desirable.
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| 9. | The buildup of heat due to skin friction during sustained supersonic flight had to be addressed.
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| 10. | This effect might also be used to reduce skin friction drag on aircraft wings by 40 %.
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