The Sikorsky X2 is an experimental high-speed compound helicopter with coaxial rotors, developed by Sikorsky Aircraft, that made its first flight in 2008 and was officially retired in 2011. == Design and development == Sikorsky developed the X2 helicopter on a $50 million budget.
The Sikorsky X2 is an experimental high-speed compound helicopter with coaxial rotors, developed by Sikorsky Aircraft, that made its first flight in 2008 and was officially retired in 2011. == Design and development == Sikorsky developed the X2 helicopter on a $50 million budget.
Source: Wikipedia "Sikorsky X2" · CC BY-SA 4.0
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