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http://www.wired.com/autopia/2010/07/sikorsky-will-fly-electric-helicopter-this-year/
http://dvice.com/archives/2010/07/sikorsky.php
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http://dvice.com/archives/2010/07/sikorsky.php
Based on Sikorsky's long running S-300C trainer, the Firefly dumps the original's 190-hp four-cylinder gas engine for an electric motor and a bunch of lithium-ion batteries. Battery duration is only around 15 minutes  not too good, but at least it allows them to show that concept has merit. Sikorsky's head of research and engineering Mark Wilner says rising fuel costs are starting to threaten the role helicopters play in many fields, making research into alternate fuels essential.
Sikorsky will unveil Project FIrefly Tuesday at the Experimental Aircraft Association (EAA) AirVenture show in Oshkosh Wisconsin.
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