Tank Shape: Ellipsoid or Something Else?

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Hi, everybody.

Is this tank an ellipsoid?
fueltank.jpg
If not, what shape is it?
 
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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.
 
The image hasn't been approved yet. You can see it but no one else can.
 
Silly me
 
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:

http://www.onlineconversion.com/object_volume_partial_out_cylinder.htm

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
 
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thanks...
 

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