Supersonic speed is so 2000's. What do you know about that hypersonic speed? Apparently Boeing does. They've made a hypersonic scramjet that can reach speeds of up to 4000 mph. The X-51A was set to be tested yesterday but was postponed.
Beyond supersonic speeds lies the realm of the hypersonic--faster than Mach 5.0, or in somewhat more down-to-earth terms, in excess of just under 4,000 miles per hour. On Tuesday, the U.S. Air Force plans to venture into that realm with the test flight of a chisel-shaped aircraft called the X-51A Waverider.
X-51A Waverider image - Going hypersonic with the X-51A Waverider (images) - CNET News.
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