RedactedNarrative: Vessel 1 (airboat) was traveling north on the Withlacoochee River when vessel 1 approched a westward turn in the river. Whille attempting to turn left the vessel started porpoising. The operator attempted the throttle up to avoid hitting the shoreline. Vessel 1 was unable to correct and hit the shorline and a tree causing the female passenger to fall onto the vessels deck.  Her injuries were a laceration to her left knee and broken femur to her left leg. 