Hydrogen tips (Score 1)

In high mach planes, one of the main problems is keeping the tip of the aircraft from melting. One of the "technologies that will be tested" is bleeding liquid hydrogen continuously through the leading panels (nose, wings, tail) to keep them cool. So they have a mechanism to take something that is kicking 70 Kelvin (-200 C), pump it through an area of the plane that is reaching 600 - 700 degrees kelvin (500 C)to cool it down and then take that now heated hydrogen and pump it into the SCRAM jet for ignition. In Aerospace design class, my prof was always very skeptical of this technology - "too many ways to blow you up" was they way he put it. Carbon carbon materials and crazy smart ceramics must have come a long way in the last 5 years...

Water Spider
Rome didn't conquer the known world by having meetings, they did it by killing all that opposed them.