[BigV]

Originally Posted by xoxoxoBruce

I don't think that para-sail would provide enough tug to make a significant difference.

This should work though. http://www.ecogeek.org/content/view/2276/

Depending on the prevailing wind conditions, a ship’s average annual fuel costs can be reduced by 10 to 35% by using the SkySails-System. Under optimal wind conditions, fuel consumption can temporarily be cut by up to 50%. The SkySails-System consists of three simple main components: A towing kite with rope, a launch and recovery system, and a control system for automatic operation.

Sail power is back.

The MV Beluga SkySails, a cargo ship rigged up with a billowing 160-meter sail from SkySails, used approximately 20 percent less fuel than it would have without the sail during a two-month voyage. Put another way, that's 2.5 tons of fuel, or $1,000 a day, in operating costs. Beluga Shipping ultimately hopes to save $2,000 a day with the technology.

$1000/day is pretty sweet. Free money, no?