The shapes are definitely not oval and are tear drop. The tubes I'm looking at are COTS for light sport aircraft form aircraft supply companies and not from the extrude/shaper. I was hopeing there was a standard shape or spec for them. However this may not be the case.
I have to model various extruded aluminum streamline tubes. Is the an airfoil number for these? So far all I can find is simple cross-sections with major, minor and wall thickness.