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Why thrust decreases then increases with velocity?

  1. Aug 25, 2010 #1
    Hello,

    I was trying to find out why net thrust decreases then increases with velocity. I recall there is pressure and momentum thrust, however I can not recall why one of them falls away and the other increases.

    Is momentum thrust the one that picks up as the mass flow increases with increased velocity?
     
  2. jcsd
  3. Aug 25, 2010 #2

    HallsofIvy

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    I'm afraid you will have to give more information. What "thrust" are you talking about? Is this a jet engine or a fluid leaving a source under pressure?
     
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