Paris 2011: Comparing the Eurocopter X3 and Sikorsky X2
Both the Sikorsky X2 and the Eurocopter X3 have prop

Both the Sikorsky X2 and the Eurocopter X3 have propellers and both are targeting higher cruise speeds; however, their respective designers have not been working to the same principles.

The X2 is effectively a semi-compound helicopter, having contra-rotating main rotors and one aft propeller, while the X3 is a true compound with a single main rotor, wing stubs and two side-mounted propellers.

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