What's a yawfin™?

"I use the Yawfin™ as a training tool for new paddlers during lessons as a method to teach better paddle mechanics.  Planting the blade properly is a difficult skill to begin mastering and the Yawfin™ bridges the gap for novice paddlers.  Tracking the blade as it pulls the board forward in a necessity for people looking to get more strokes per side. Any flutter or movement in the blade will begin to push the board in an undesired direction." -Robert Norman, FL