RedactedNarrative: According to V1 operator he left Shangra-la ramp and headed east; when he had traveled about 1/2 mile, he slowed to an idle speed and began following another vessel. According to V2 operator he also left Shanga-la ramp headed east just a few minutes after V1. When V2 entered the main water body, he got on plane.  V2's operator stated he did not see V1 until right before impact.  V2's bow made contact with V1's stern and outboard motor.  V2 then ramped over V1 with it's keel and lower unit striking V1's motor cowling and driver's seat; then landing on the starboard side of V1.  V2 towed V1 to Mt. Harbor.