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Fuel velocity vs exhaust velocity difference?

  1. Jul 5, 2012 #1
    hi all,

    i've been confused about what the difference is between fuel velocity and exhaust velocity. apparently, fuel velocity is equal to rocket velocity minus exhaust velocity. attached are screenshots of the textbook reading that confused me. if anyone can explain this section to me, i would greatly appreciate it!


    Attached Files:

  2. jcsd
  3. Jul 5, 2012 #2


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    hi joe! welcome to pf! :smile:
    fuel velocity, vfuel, is the velocity of the fuel (relative to earth)

    exhaust velocity, vex, is the velocity of the fuel relative to the rocket

    vex is constant (because the rocket engine has constant power) :wink:
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