Experimental aircraft speeds to Mach 5.1 in test flight
mcclatchydc.com
mcclatchydc.com
https://news.ycombinator.com/item?id=5653515
https://news.ycombinator.com/item?id=4387725
https://news.ycombinator.com/item?id=1383627
A story timeline would be a neat feature for HN.
One being that it isn't just a simple thing speed up an airplane to faster than we have before. They have different designs because the air acts differently as the speed changes and doesn't function the same. Seeing how the shape (overall but especially the nose) changes for each type is pretty cool.
A lot of the articles get linked off here if you have an interest: http://en.wikipedia.org/wiki/Hypersonic
I do agree with you that the Air Force wants hypersonic flight vehicles. Looks like air-breathing hypersonics are the priority.
http://www.scientificamerican.com/article.cfm?id=piercing-th...