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Twin-turbine helicopters
United States military helicopters
Sikorsky aircraft
2000s United States experimental aircraft
Ducted fan-powered aircraft
Aircraft first flown in 2007
2000s United States helicopters
Compound helicopters
Piasecki aircraft

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Piasecki X-49 SpeedHawk

List of X-planes

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Sikorsky UH-60 Black Hawk

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Boeing AH-64 Apache

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