I wrote an article for Popular Science about a Turkish sailboat powered not just by wind, but by sun. A teaser for the nautically inclined:
A desire to make boating clean again inspired Hakan Gürsu and Sözüm Dogan of the Turkish design firm Designnobis to envision a zero-emission, engine-assisted boat that didn’t burn a drop of fuel—and was swank enough for the yachting set. Their solution is Volitan, a 105-foot concept sailboat powered by nothing but sun and wind. The ship’s strong, lightweight body is made from a composite of carbon fiber and epoxy resin and covered in carbon-foam lamination. Its two solid, solar-panel-covered sails, which extend from the ship’s body like wings (the boat is named after a flying fish found in the Mediterranean), catch wind when the sailing is good, and deliver electricity to the two 200-horsepower electric motors that propel the ship when the wind won’t cooperate. Controlled by an onboard computer, the wings rotate and tilt to track both the sun and wind. The energy they harvest is stored in conventional marine batteries that sit at the bottom of the boat’s centerboard and act as ballast.