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It takes more fuel for a motorized flat object to go against the wind. That is why cars and trucks and Semi-trucks have removed as much flat surface as possible. Take and flat board and go out in a brisk wind. Hold the flat board at ninety degrees...straight up. You will notice how hard it for the wind to go around it. Next hold the board at a forty five degree angle and you see that the wind passes by the board more easily.

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