This is a Revit 2010 parametric helix family for you to download and abuse. It's good for about 3 full rotations (1080 degrees) before you start having and visible artifacts. You can think of this in some ways as another basic sketch tool like the ones you have in the draw gallery. Just as you would draw an arc, put a profile on it, and make a sweep, you can use this to draw a helix, host profiles on it, and make forms. This includes being able to make in-place sweeps in the .rvt environment of whatever category you want... Continue to post....
