Quote:
Originally Posted by aerohead
* the vehicle, with wind from behind, is a crude square-rigger.
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No, it is not. You are starting from this assumption, and so you go wrong from the beginning.
It is not a square-rigger, it is much more like a modern sailboat with triangular sails. Which can and do sail faster than the wind speed. And the sails (the propeller blades) meet the wind at an angle.
-soD