"If you wanted to cross the ocean by ship, you’d probably choose an
engine-driven vessel over a sail-driven vessel. The engine will get you
where you’re going faster; it enables the ship to be much larger than
it could be if it were driven by a sail; and it requires much less
manual intervention to keep it going. Besides, you won’t be at the
mercy of unpredictable winds." ... from an article on "Solar Winds"

This is a great "green" idea ... but the wind is not that
predictable or dependalbe. Because of this, they will have to have a
back-up plan for forward motion.

Thanks for the clip.