An update on the splitter 07/30/2007:
Imagine standing at he the back of the hovercraft and looking at the back of the fan. Visualize a line down the middle (up and down) separating the fan right and left. The airflow thrust on the right side of the fan is swirling downward when running. The airflow thrust on the left side is swirling upward.
I've cut up the original splitter and angled it to match the angle of the blades (1/4" gap) and the directional flow of thrust air. The middle part (the hub) and the transition between the three pieces is something I could use some suggestions on. The middle part is actually just below the hub height to help prevent escaping air; the paddle effect of the fan maintains air pressure. I'll be fiberglassing the whole thing together and gluing it on to the blue foam.
I'm thinking that the middle part of the splitter will look a little like a bow-tie or a propeller without a hub.
I'm not sure if anyone has done something exactly like this before, I'm just tying in bits and pieces of other peoples work plus a few ideas of my own. If you have seen something like this before, please post an image or list a name so that I can reseach it. I might have to look at Neoteric again for a start. Think of this splitter as a kind of a STATOR.
