RedactedNarrative: Vessel 1 launched from the premium ramp at Wind Creek State Park.  The operator idled near the ramp waiting for passenger to park the launching vehicle.  The operator of Vessel 1 stated he, "gave the boat gas when a loud boom came from the engine, followed by a cloud of smoke."  The operator killed the power to the engine, called for help, donned a perspnal flotation device, and jumped from Vessel 1.  A nearby vessel brought the operator of Vessel 1 to shore.