I found a .roc file for the estes Loadstar and it seems to have pretty good fidelity. But I tried something and was a little surprised by the results. Basically the rocket is a two stage rocket. The default design is with the fins lined up with one another. I ran the sim in that configuration. Just for fun I then rotated the fins on the booster section 45 degrees so the fins would be in between one another. I figured that would up the drag factor. Ran the simulation with the same engines and the results were identical to the default configuration!?