RedactedNarrative: 2 persons on a Personal watercraft when operator lost control and flipped over.  The PWC shot forward towards the beach nearly striking swimmers in the water.  Owner had just bought the vessel from a dealer in CT and it was unregistered.  The operator had no prior experience. The operator was injured.  Operator was cited for Chapter 90B Sec.2 operating an unnumbered motorboat and unsafe operation of a personal watercraft.  Operator inexperience was cause of accident.