Not sure if anyone has seen this, but here is the latest and greatest in inboard propulsion. No keel, the props pull the boat, not push, so they face the bow! They also claim 30% better fuel consumption. It looks like an outdrive, but it goes thru the hull, not the transome. I went to the boat show to see this motor on a boat, but none were there. So far these are for boats 30 - 50ft. I wonder how they handle hitting a potline or any rope?
http://www.volvo.com/volvopenta/na/en-us/#