DSK the marine propulsion expert wrote:


In any case, the ship was going full speed, the loss of the prop stream
across the rudder would not reduce the rudder's effectiveness very much.



http://www.dellamente.com/titanic/engines5.htm

"Regardless, most scenarios agree steam to the turbine would have been
cut off. While this had little effect on the ship's forward motion, it
deprived the rudder of the steady, forceful stream of water necessary to
turn a ship of that size. Several sources claim the rudder on the
Titanic and her sister ships was too small. If that was indeed the case,
shutting down the center turbine would be the last thing you would want
to do in an emergency."

Hmm, seems to agree with me? My yacht steers well without propwash
because it's rudder, in comparison, is huge... My point is that, most
power vessels can have much smaller rudders because they use the
propwash to significantly increase rudder effectiveness. It's standard
naval architecture.

Cheers