According to operator another vessel passed their inflatable vessel causing a wake.  They went over the wake but when the second one came both operator and passenger where thrown out of vessel.  At this point when the operator surfaced he saw the vessel circling the passenger.  The vessel struck the passenger and the engine prop snagged her jacket and stalled the boat.  Passenger suffered injuries.  Passing vessel returned to assist and gave a knife to the operator to cut passengers jacket free from prop.  Pa.  Investigator determined that operator failed to negotiate a wake.  Speed may have been a contributing factor along with the unequal weight distribution of the parties onboard.  Pfd's onboard but not worn at time of accident.
Haverhill                     