FARNBOROUGH: Sikorsky develops all-electric helicopter

http://www.flightglobal.com/articles/2010/07/20/344780/farnborough-sikorsky-develops-all-electric-firefly.html

Sikorsky has revealed that it has developed an all-electric 200hp (150kW) helicopter, the Firefly, that will be unveiled later this month and fly later this year.

Based on the S-300C piston-powered helicopter, the electric version will feature a high-efficiency, electric motor and digital controller from power conversion specialist US Hybrid, coupled with a lithium ion energy storage system from Gaia Power Technologies.