Saw an interesting boat in the port today (I believe "Sunliner"?).
Twin screw with tunnels, fairly close to centerline. Props were about
18"-24" dia (was at a distance) with "posthole digger" like pitch - 4
blade. Surprisingly large squarish spade rudders.
Don't have a clue as to how well she will twin screw on her own, but
doesn't matter as she also had a bow and stern thruster.
Boat was @ 36-40 feet, and I figure with that setup, even "I" could
handle her around the dock.

otn