How to create Lobed/Forced/Jet Exhaust Mixer?

I am trying to make a model of Jet exhaust Mixer, but can't seem to use LOFT properly. (I am attaching the .ipt file.)
1. I've tried using circular pattern in sketch mode, then lofting -- doesn't work.
2. I've tried extruding then circular pattern of the solid feature, then lofting -- doesn't work.
I don't know what I'm doing wrong and why the loft is not working! And the circular pattern I have used are creating separate objects, not a single solid part.

Why is Autodesk Inventor so bothersome? :-(

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