In November, WinFlex, a wind-power company based in Kiryat Yam, Israel, received one of the most coveted prizes in the GE Ecomagination Challenge for developing a wind-turbine system that uses a light, flexible cloth sheets made out of composite materials as the rotor system for a wind turbine.

FORBES: Inflatable Wind Turbines Pass Laugh Test

The subsequent acquisition of a manufacturer of rotor blades in the Netherlands rounded out the business.

FORBES: International

The rotors turn in opposite directions to cancel out torque, the twisting action which requires conventional helicopters to use a tail rotor a hazardous appendage.

ECONOMIST: Autonomous helicopters