AutoCAD Inventor :: Find The Center Of Pressure Of Model Rocket?

I made a custom model rocket a few days ago and I posted some pics online.  A lot of the rocketry community gave me crap that my fins are too small, and my nose cone was not the right shape.  

I made a CAD of the rocket in inventor and I would like to run a simulation so I can see what it will look like when the air is flowing over my rocket.  

Here's a STEP file of the rocket, as of now I don't have the density of the parts set because I am still trying to figure out how to add custom densities.  I know that there are somethings about the rocket that don't seem right, like the nose cone that doesn't go over the sides of the tube - but that was a machining error on the actual rocket and I wanted to make the CAD as similar as possible.