Professionally, I use Creo. Equation driven shapes can be accomplished using a function called TRAJPAR (trajectory parameter). I've found it to be a bit fussy on past projects. An easy work around is to use Excel to generate an array of points, import that array into Creo as a .pts file, and create a spline through the points. The result isn't mathematically perfect but definitely close enough for a 3d printed nosecone.

For this project, I'm trying to use Fusion 360. Even with the recent changes in Autodesk's license for home use I feel it is a good option for hobbyists, especially if you have a CNC machine. The approach to modeling in Fusion is different than in Creo and it is taking a fair bit of effort for me to learn. It does look like I'll be able to use an imported points file and create a spline through it in Fusion, I just haven't done it yet. I haven't found a direct equation-to-curve function in Fusion, Not saying it isn't there, just haven't found it yet. I wish Creo had a home use license similar to Fusion.

If anybody is looking for the Von Karmen equation, I found it here:

en.wikipedia.org