Joe Vogel, Boeing’s hypersonics director, says a third X-51 hypersonic test vehicle will fly this year and a fourth vehicle is available to fly if needed.
[thumb]http://www.flightglobal.com/news/articles/third-x-51-hypersonic-test-vehicle-to-fly-soon-373383/[/thumb]

![215849zc3gemgaclmax3s6[1]](http://alert5.com/wp-content/uploads/2012/06/215849zc3gemgaclmax3s61-500x375.jpg)