RedactedNarrative: V1 was launching at the marina and was just off of the trailer. The operator attempted to start one of the engines on the vessel which started then stalled out. He then attempted to start the other engine which started. He attempted to start the other engine at which time there was a loud pop and the engine ignited into flames. The popping sound was an explosion and the vessel burst into flames. Due to the explosion the operator and his daughter were forced to jump into the water. The female sustained very minor injuries.