Force applied by the rod being equal, then high density sinking line will have a more pronounced dolphin nose than a floating line, or is it the other way around?
It depends. Which one is stiffer? As far as I know density and stiffness are not related.
We've been through this with the whole rod bending thing. If we bend a non-tapered, elastic rod it will assume a naturally round shape at the bend until we apply too much force and then the rod will buckle and collapse. If we bend that rod by pushing the two ends together the rod will assume a tear drop shape assuming it doesn't buckle before getting all the way to the tear drop. We could also push inwards at different points along the rod. Let's say we push in at about the first quarter point and the third quarter point on the rod, ie. about midway between the middle and ends on both sides, and we push until the legs are parallel and we have a U shaped rod. Push a little harder and we will have the legs almost crossing, i.e that tear drop shape. Now get someone to push one end in the opposite direction until the legs become parallel. What does the shape look like at this point?
As long as we don't cause the rod to buckle or kink we can apply forces to different points on the rod to create all kinds of shapes.
