Originally Posted by chuckfluffer
The rod can only do one thing...straighten. It has been calculated, by better men than me, I might add, that the potential energy from the rod only accounts for less than 20% of the total energy needed to cast a flyline. That means that over 80% comes directly from the caster via leverage.
Here is what the 80% from the caster can do when you get rid of the rod altogether. This is the video I originally intended to post but couldn't find it again. Great video.