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In less than 100 seconds, Ivan Marusic describes the power struggle between a cyclist and the wind.
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The V in the V^3 is the relative velocity of the cyclist with respect to the air velocity. In the case of windmills that are fixed, their power also dépends on V^3, where this V is just the velocity of the wind(air.
If elite cyclists rode fully faired recumbent bicyclists they could average 40 mph + and take full advantage of aerodynamics.