How to model a 3D spiral in Inventor?

If you need to model a 3D spiral in Inventor (e.g. a 3D pipe path, own spring type, wind up a hose or cable on a reel, etc.) you can use the "Project to Surface" function in 3D sketch. You can wrap an angled line on a cylindrical surface.

Then you can sweep a profile along this 3D path or generate a wire or pipe system.