Some years ago I went on holiday to Norway. There were small car ferrys running across the fjords carrying about 20 cars at a time or so. The design of the hull appeared to be completely symmetrical side to side and front to back with the bridge being on a bridge across the middle of the boat. I can only imagine that they had propellers and rudders at both ends having watched their maneuverability and the fact that they never turned around. I don't know if they used all the propellers all the time or just the ones at the current rear end, but their bow wash did show something of the sideways wash mentioned earlier.
Is this not more likely to be the Voith Schneider system as used on some of the Isle of Wight ferries?
Regards, Terry.
