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Continue to ChatSikorsky Introduces “Project Firefly,� Electric Helicopter Demonstrator https://aviationnews.eu/news/2010/08/sikorsky-introduces-project-firefly-electric-helicopter-demonstrator/
Sikorsky Introduces “Project Firefly,� Electric Helicopter Demonstrator https://aviationnews.eu/news/2010/08/sikorsky-introduces-project-firefly-electric-helicopter-demonstrator/