From the article:
An engineering company has developed a system that may offer some control over NASA’s high-altitude weather balloons. The control device, called StratoSail, consists of a spar from which an 8-foot rudder and an 18-foot wing hang. The developer, Global Aerospace Corp. of Altadena, Calif., has tested a miniature version from a tethered blimp. The company’s president, Kerry Nock, said a fullsize version has been built and may get a test sometime next year.
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MORE ABOUT STRATOSAIL
Read more about StratoSail here