Stuthepirate said...lotofwind said...[brSeems the old school sails are becoming more and more redundant.

Below info was taken from the artical.
Instead of support from a mast, boom and rope, the SkySail is tied to the bow by a single line that also contains a cable linking it to a computer, which controls it. It acts like a child's kite, carving figure-of-eight patterns in the air, reaching speeds four times higher than the prevailing wind, which dramatically increases its pulling power.--------------------------------------------------------------------------------
Seems rather efficient.
Wonder how efficient they are sailing into a head wind?
Ship still needs a conventional power plant to drive it. The kite cannot provide 100% of the power needed. So during light air, headwinds etc the ship would not use the kite.
But kiters on racing boards are getting pretty good upwind efficiency, so maybe they can run them quite close to the wind.
Also, the prospect of kites in space is not that outlandish. I believe NASA intend to launch a craft that uses massive mylar sails to harness the power of solar particles. The sails have an insane surface area. Although they look a lot more like kites to me.
In fact, Japan has already done it:
"IKAROS" - Interplanetary Kite-craft Accelerated by Radiation Of the Sun (gotta love Japanese Engrish Acronyms) project in 2010.
en.wikipedia.org/wiki/Solar_sail