RedactedNarrative: Operator had just launched boat at the public access. Operator stated she backed the boat off the trailer, put the boat in drive and slowly started to increase the throttle. Driver stated she then heard a loud bang. She saw smoke and fire coming from the engine compartment of the boat. The operator grabbed a throwable PFD and the passenger grabbed a life vest and both moved to the front of the boat. A passing boat came to pick up both parties and brought them to shore. Boat proceeded to burn until the fire department arrived. The boat was a total loss. The passenger was treated for a burn. Alcohol was not a factor.