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Kite-Powered Ship Launched
The Grand Poobah writes "The big-kite technology we discussed last month has officially launched in Hamburg, Germany. Reuters has a writeup of the new technology, which aims to cut fossil fuel use on sea voyages by an estimated 20% by means of a huge computer-controlled kite. The link includes a video."
This is a great start but not the whole answer. The position of the kite allows it to only work with the wind coming from abaft of beam. (from behind)Also creating a "lee-helm", driving her nose down wind. To get the 20% fuel savings (I am guessing closer to 15%, from experience) 50% of the time, a second kite would be needed amidships. The wind would in fact be much stronger at altitude, But with little to block it 100 feet above sea level, I believe a schooner rig would be as productive, more often. "Down-wind" is not the best point of sail. "Close-hauled" is. Where the wind comes from either side of the bow. Creates an airplane wing effect that sucks ship forward. (Positive to negative) With kite alone, the ship would lose a lot of energy trying to stay on course due to rudder angle. Under perfect conditions, this will work great. Just not often. I am retired from the U.S. Merchant Marines and have worked and sailed on many tankers and schooners. I do believe we tossed sail aside to quickly. Amazing, free and renewable energy.