RedactedNarrative: V1 was traveling northeast in Clear Creek toward the AR River.  While following the channel, a log was floating on the surface of the water which the operator stated he did not see until the last minute.  When V1 struck the log, it knocked the motor in the full upright position locking the motor in place.  The impact caused the transom to bust and display stress fractures. The impact ejected the passenger on the port side.  The operator pulled the kill switch to kill the engine.  The passenger was wearing his PFD and sustained a knot below his right knee and scrapes on his legs from hitting the console.  He refused medical treatment.