Well the first successful test was done on a trip from Germany to the USA and back to Norway and achieved a 20% fuel-savings (thats 2.5 tons of fuel and $1,000 a day) round trip using an 80 sq meter para-sail. Next step, a 160 sq. meter sail followed by a gigantic 600 sq. meter sail to be built into a new super cargo ship. More of this please!
Below is a german video showing the test trip. Happy sailing!