RedactedNarrative: V1 were following another vessel through an airboat trail that the operator of V1 was unfamiliar with. The operator of V1 has only 20 hours of airboat experience. The operator of V1 was trying to stay in eye sight of the other vessel so he did not get lost in Flying Eagle WMA prairie. V1 came around a right hand 90 degree turn, and saw an "S" curve with tree's lining both sides of the canal that he had to go through. While still in the right hand turn, V1 entered the "S" curve. The operator of V1 took his foot off the throttle as he entered the curve, and when the airboat settled into the water the port rear corner of the vessel struck a cypress root. When the vessel struck the root, it caused V1's bow to be pushed right striking a small tree. The operator of V1 tried to get back in the airboat trail by fully accelerating, and pulling the control stick back. That response caused V1 to bounce off three other smaller tree's as it went down the airboat trail inside the tree lined "S" curve. The operator of V1 continued forward at full throttle, and it was not until V1 hit a ten inch diameter tree that the vessel stopped. Both occupants were thrown onto the front deck of V1. ;Victim suffered a broken right femur. Contusion on the top right side of his head