So after a failed attempt last year the US will attempt to reach Mach 6 with the X-51A

http://www.bbc.com/news/technology-19257769

Will they beat MAch 5 this time?

Nice find DD. I see that this thing will break up after the test, I hope they sort that bit out before it becomes a commercial flight. 

It will become the ultimate cruise missile long before there is any human flight Diesel....try seeing tha one coming!!!!

I guess you would be toast long before you'd seen it coming let alone heard the thing. 

Would be like the first V2 hitting London in WW2......a "Gas main explosion"

And the latest news is that the flight was a total failure, that the craft had a problem with a fin and crashed before it's scramjet could even fire up..........another expensive "D'oh"

Boy, they're just hip deep in bad luck, aren't they?