2022-07-19


Worthy

  • An Ex Rocket Man's Take On It: About Hypersonic Vehicles

    There is a formal definition: “hypersonic” is that speed at which the shape of the shock wave system about the vehicle no longer changes its shape appreciably as flight speed increases further. The speed at which that happens depends upon the shape of the vehicle. For “pointy” shapes likes missiles and aircraft, it is just about Mach 5, or a velocity that is 5 times the speed of sound. For really blunt shapes like space capsules traveling heat shield forward, it is just about Mach 3. Those two values are the rules of thumb for “hypersonic”, for those two classes of shape.


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