RedactedNarrative: Operator was unloading V1 into Beaver Lake; He turned the ignition key to start the engine and heard a loud popping noise.  The engine then exploded, which resulted in the padded motor cover striking the operator in the back of the legs.  He jumped overboard and V1 became engulfed in flames.  The anchor rope was still intact to the boat trailer allowing the Fire Dept. to easily extinguish the fire.  V1 was completely destroyed though.