Though the ultra fast SpeedHawk Piasecki X-49 compound helicopter is still just a concept helicopter, it does indeed help represent one reason why the United States military is still at the top of the hill since it is all about innovation and experiments. Using something that is called a vectored ducted propeller, this helicopter that was built around the airframe of a Sikorsky YSH-60F Seahawk is faster than you can imagine! This concept US military helicopter is also one odd looking aircraft. I mean, really, take a look at that rear rotor. Have you ever seen anything like that? I bet that huge set of blades to its rear provides some amazing forward thrust, eh? This Piasecki attack helicopter sure does move through the air on this video!
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