On Wed, 20 Aug 2008 02:15:03 GMT, Short Wave Sportfishing
wrote:

It's an interesting design, but I'm confused about the tunnel system.
Looking at the drawing, it would appear that the prop sits half way
out of the water.

Than can't be very efficient.

Of course it can. Ever hear of an Arneson Drive. Only half the seven
blade prop is in the water. No drag from shaft, strut, prop hub.

Casady