Martin Aircraft Company Martin Jetpack
Powered by a pair of screaming-loud ducted fans, the Martin Jetpack broke a long-standing record by hovering for 46 seconds this past July. Inventor Glenn Martin spent nearly three decades cutting down the machine's weight—including designing a partially carbon-fiber engine from scratch—and tweaking the fans' aerodynamics to produce enough lift. The first packs go on sale next year. $100,000; martinjetpack.com
Aviation & Space. Martin Aircraft Company
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