http://www.titanic-titanic.com/titanic_sea_trials.shtml (http://www.titanic-titanic.com/titanic_sea_trials.shtml)
Two pieces of data from the 5th and 6th paragraphs of that page of titanic-titanic.com:
When Titanic was traveling at 20 knots, her wheel was turned hard over. Titanic traveled 3,850 yards (3,520.44 meters) (11,550 feet) in the resulting circle.
When having her engines in full reverse, it took her 850 (777.24 meters) (2550 feet) yards to come to a complete stop.
Just some Titanic information that I thought could be of use.