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Is this an ellipsoid?

  1. Oct 1, 2009 #1
    Hi, everybody.

    Is this tank an ellipsoid? fueltank.jpg If not, what shape is it?
  2. jcsd
  3. Oct 1, 2009 #2
    The question is kinda of important and isn't a homework thing. I'm trying to determine the volume of the remaining fuel in a tank like this by the height of the fuel remaining. I need to find out for work.
  4. Oct 1, 2009 #3


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    Gold Member

    The image hasn't been approved yet. You can see it but no one else can.
  5. Oct 1, 2009 #4
    Silly me
  6. Oct 1, 2009 #5


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    Gold Member

    That is not an ellipsoid, that is a cylinder with semispherical ends.

    It breaks down to the volume of a semi-filled cylinder of length L and radius R plus the volume of a semi-filled sphere of radius R.

    Uh ... I went looking for the relevant formulae but ended up finding a calculator that does precisely what you want:


    Be careful with your numbers:
    - you're asked for the radius which is only half the diameter of the tank
    - you're asked for the length of only the straight part
    Last edited: Oct 1, 2009
  7. Oct 1, 2009 #6
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