The only thing that keeps a constant bearing in the Dick O'Kane attack is the constant bearing from the torpedo to the target. And since you're thankfully not aboard the torpedo to measure that.....there's a point there somewhere. In the Dick O'Kane attack the range absolutely has no bearing on the solution so long as the torpedo has the range to get as far as the target is away. It matters not if the target is 500 or 2500 yards away. The firing solution is the same. And I have hit targets 2500 yards away with it.
Actually ANY torpedo that will hit its target maintains its target on a constant bearing throughout its trip from acquiring course to impact. Therefore, from the point of view of the torpedo ALL attacks are constant bearing attacks.
Define constant bearing attack so I can understand why you're calling a Dick O'Kane attack that. I suggest you check out my
tutorial video to ensure that you're right. I'm curious what you are talking about there!