The five-segment sail will telescope down onto itself
Scale model of a Wind Challenger Project sail fully deployed
The sails can be lowered when in port or in rough weather
Artist's rendition of a cargo ship equipped with the Wind Challenger Project system of sails
Depiction of a cargo ship equipped with the Wind Challenger Project system of sails
Of the world's nearly 45,000 cargo ships, many burn a low-grade bunker fuel in their engines and produce pollution equivalent to millions of automobiles. To help reduce that toxic load and keep the price of shipping freight reasonable, engineers at the University of Tokyo (UT) and a group of collaborators have designed a system of large, retractable sails measuring 64 feet (20 m) wide by 164 feet (50 m) high, which studies indicate can reduce annual fuel use on ships equipped with them by up to 30%.
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