Sikorsky S-69

June 19, 2011 - 7:05pm

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.

May 25, 2010 - 11:48am

Sikorsky Aircraft’s X2 technology demonstrator achieved a forward speed of 181 knots on a test flight today at the Sikorsky Development Flight Center in West Palm Beach, Fla. The contra-rotating coaxial rotor prototype is designed to demonstrate that a helicopter can cruise at up to 250 knots while retaining excellent low-speed handling and efficient hovering characteristics, as well as a seamless and simple transition to high speed.

 
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