Slashdot Mirror
DARPA Looking into Hypersonic Bombers
while(true) writes "As reported previously here on Slashdot, hypersonic jets from NASA has recently been in the news. Now DARPA is showing interest in the military applications and is to host a conference on hypersonic unmanned bombers. These bombers could be based in the US and yet strike from space at any place in the world within 2 hours. BBC has a report about these air/spacecraft that could be operational by 2025."
I was in grad school as an aerospace/fluids engineer in the mid 90's during the aerospace boom (a bit like the dot-com boom). Hypersonic aircraft were on the drawing board but never made it. Turns out we didn't have a sufficient understanding of hypersonics. Building hypersonic wind tunnels and shock tubes is very difficult so computational models were used heavily. The computational models did not have sufficent validation due to lack of experimental data, so designing hypersonic vehicles turned out be a lot more difficult than originally thought. Also the materials problems in building aircraft that can tolerate the heat of hypersonic flight is still very significant. Titanium ceramic materials were developed, but manufacturing and machining with these materials was prohibitively expensive and difficult. Back then it the thinking was that the hypersonic modelling and material problems could be rapidly overcome and this technology was a few years off, it never happened though. I kust wonder if this is not just another Darpa pie-in-the-sky project where they are assuming difficult and unsolved problems can be surmounted. Guess we'll see if this project materializes, but I am skeptical. I think the Columbia disaster painfully illustrates the significant problems of hypersonic flight. MM