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I When should the drag coefficient of a rocket peak?

  1. Apr 17, 2018 at 6:16 AM #1
    Hi,

    When considering the drag coefficient of a rocket in transonic/supersonic flight, I always expected the drag coefficient to peak at exactly Mach 1 due to the abrupt increase in pressure that occurs when breaking the sound barrier. However, I have been looking at several websites and articles that predict the drag coefficient of a rocket to peak at slightly above Mach 1 (say Mach 1.2). I.e. Figure 4 on this website:

    http://what-when-how.com/space-science-and-technology/rocket-propulsion-theory/

    Could anyone explain why the drag coefficient peaks at slightly above Mach 1 instead of exactly Mach 1?

    Thanks!

    /krihamm
     
  2. jcsd
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