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New That's backwards
The wheels are turning a chain that drives the prop. If you disconnect the chain and lock the prop in place it will go downwind at something less than wind speed. Engage the chain and it spins the prop, providing thrust.

New Ah, yes, I see how that would work.
The wheels spin the prop so it pushes back against the wind, so the effective wind at the propeller is greater than the actual wind. Wind plus reverse thrust = faster.
     Mechanics is Counter-Intuitive Part MCMXIV - (Another Scott) - (4)
         Awesome, a follow-up! - (drook)
         I don't consider that "counter-intuitive" - (Andrew Grygus) - (2)
             That's backwards - (drook) - (1)
                 Ah, yes, I see how that would work. - (Andrew Grygus)

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