U. of Maryland’s Human-Powered Helicopter Aims to Make Aviation History Next Week By Clay Dillow / May 6, 2011
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Sikorsky’s X2 Prototype Breaks Rotorcraft Speed Record With 258 MPH Flight By Clay Dillow / Aug 3, 2010
Sikorsky and Eurocopter Compete To Build Super-High-Speed Choppers By Joseph A. Bernstein / Jan 5, 2011
Check out the double-rotor helicopter that could be the US Army’s next Black Hawk By Rob Verger / Jan 27, 2021