National Security Journal on MSN
The Mach 6.7 X-15 ‘Hypersonic Rocket Plane’ Has a Message for the U.S. Air Force
Key Points and Summary – The X-15 was a rocket-powered research aircraft that pushed human flight to the edge of space and deep into the hypersonic regime. -Air-launched from a B-52, three X-15s flew ...
Here’s What You Need to Know: The X-15’s Mach 6.7 flight record has remained unbeaten for over half a century. The date was October 3rd, 1967. U.S. Air Force test pilot William Knight... Here’s What ...
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