Patent ID: 8403715
Filing Date: 2013-03-26
Classification: B63B,B63H

Abstract:
1. A marine jet drive for a boat having a transom and a drive shaft extending through the transom, the boat afloat in a water body, the marine jet drive comprising: a support casing disposed aft of the transom and a shaft within the support casing, the shaft having an end connectable to the drive shaft; a jet pump comprising a chamber and a blade coupled to a portion of the shaft extending into the chamber; the chamber attached to and supported by the support casing aft of the support casing, the chamber having an inlet for receiving water into the chamber and an outlet; the blade being coupled to the portion of the shaft for co-acting with the chamber to draw water into the chamber inlet and discharge water in a reactive jet out the chamber outlet to reactively propel the boat; and first and second fins extending downwardly and outwardly from the bottom surface of the chamber adjacent to the inlet, the fins being separated from one another, the fins having upper ends adjacent to the chamber and lower ends spaced apart from the chamber, the separation between the lower ends being greater than the separation between the upper ends.