Eurocopter’s X3 to compete against Sikorsky’s X2 Posted on September 28, 2010 by alert5 Eurocopter has begun test flights of the X3 high-speed hybrid helicopter demonstrator, its answer to Sikorsky’s X2. Related posts (Automatically Generated): Sikorsky X2 hits 225 knots First S-70i BLACK HAWK Helicopter enters Flight Test Program Is Sikorsky’s X2 a true helicopter? Sikorsky X2 hits 250kts Flight tests begin for Eurocopter’s Tiger HAD in Spain Surion makes first public demonstration