it would likly be based on severla things:
* The center of gravity(CG)
* The distance the rudder is from that CG
* The size of the control surface(im assuming its an airfoil)
* The type of airfoil of the tail
* The speed that can be maintained at full rudder deflection(at somepoint your likly to get too slow to get much out of the rudder)
These assumptions are based off of my experience with aircraft, i assume in some respects subs and planes are pretty simple. Subs fly/swim in water, planes fly/swim through the air.
i cant wait to see a high speed tactical sub that banks/rolls and pitches to turn. Small stubby wings and tail surfaces and kick ass thrust
