SOLIDWORKS 2004!!!!
I am using it as we speak. There is NOTHING I can't do with it. In mid design I can change materials of any and all parts to change my CG's and analyze material forces and stress points. I can modify anything as I go and look at the affect of different airfoils. Iv'e used it in hydrodynamic and aerodynamic design. I even double check the design of my ARF's to see where I can make improvements.