"Sikorsky, a Lockheed Martin company, is producing a Hybrid-Electric Demonstrator (HEX), a fully-autonomous hybrid-electric vertical-take-off-and-landing (eVTOL) prototype. With a maximum gross weight of more than 7,000-pounds, the uncrewed aircraft will serve as a flying test-bed to evaluate...
This seems to be the patent for the Ishida TW-68, includes nice drawings.
http://www.google.com/patents?vid=USPATD332079&id=NeQpAAAAEBAJ&printsec=abstract&zoom=4#PPP1,M1
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