RedactedNarrative: 2 PWCs operated by Operator 1(Vessel 1) and Operator 2 (Vessel 2) were traveling west along the southern shore of Lake Pontchartrain in Jefferson Parish at approximately 50mph. Vessel 1 was ahead of Vessel 2 with vessel 2 closing the distance between the two vessels. Vessel 2 traveling generally parallel to the direction of vessel 1 with it's course offset by approximately 25 feet to the starboard side of vessel 1's course. Just prior to Vessel 2 overtaking Vessel 1, Vessel 1 makes an abrupt turn to starboard without looking back. Vessel 2 attempts to steer to starboard to avoid collision. Vessel 2 turns approximately 70 degrees immediately before impacting vessel 1 causing vessel 2 operator to eject from the pwc. 
  
  Considerable fracture was sustained below the rub rail/cap of vessel 2 abaft of beam near the stabilizing strake, allowing water into the hull/engine compartment resulting in partial capsizing. Considerable fractures sustained by vessel 1 above the rub rail/cap, vessel 1 still operational. Vessel 2 towed in by nearby boater to the launch. No injuries sustained. No observable evidence of impairment. Both operators were wearing type III pfds. Contributing factors are Primary - Rules of the road #8 Operator of vessel 1 made an abrupt turn or change of course without first making sure the turn could be executed safely without collision. Secondary - Excessive speed - Vessel 2 operator was travelling at a speed in excess of what as safe given the proximity of the 2 vessels and was unable to reduce speed and/or turn to avoid collision. Tertiary - Operator Inexprience - Vessel 2 operator has less that 20 hours operating PWCs and was unaware of the inherent dangers in operating at that speed in close proximity to vessel 1.  This is a 2 vessel collision.