For handwriting in general, I would not recommend a fountain pen. For cursive in particular, though, sure. The soft, pressure-sensitive tip of a fountain pen is the only place where cursive really makes sense to me. With a ballpoint, felt-tip, or pencil, printing feels much more natural.

For what it's worth, I'm not a big proponent of fountain pens or cursive, but I do think they go hand-in-hand.