RedactedNarrative: The owner/operator had filled the vessel up with fuel and then taken it to his home to dry run the vessel with earmuffs to test for leaks. He stated that the boat had no issues during the test. Once arriving at the Rotary Park Launch Ramp, the operator''s son backed the trailer into the water and the operator backed the boat off the trailer away from the launch ramp with the detent slightly set in reverse at 800 RPM. The vessel was running in the water for approximately 5 minutes. At this point, five of the six family members were all on the vessel. As the vessel was slowly drifting away from the launch ramp, the operator stated that he shifted the vessels detent forward to throttle back towards the launch ramp which is exactly when the explosion occurred. He stated that he turned around and saw his infant grandson in flames, grabbed him and dove in the water. The infant was wearing a Personal Floatation Device (PFD) but the operator at the time was not. As the vessel began to drift south down the river two more of the family members were able to jump off the vessel into the water as well, neither individual was wearing a PFD. One family member remained on the vessel as it continued down the river but was eventually able to find a PFD, put it on, and jump into the river. She was rescued by Bullhead City lifeguards and returned to the Rotary Park launch ramp where the rest of her family remained. The vessel drifted until it became stuck on land on the Nevada side of the river, where it eventually began to sink due to the fire. The vessel was eventually recovered. 
  
  Three of the five family members were taken to the hospital for treament of the burns they recieved from the fire.