Patent ID: 7121904
Filing Date: 2006-10-17
Classification: B63B,B63H,G01P

Abstract:
1. A water jet propulsion watercraft, comprising: a water jet pump disposed at a rear portion of a hull; a hull bottom plate disposed downwardly of the water jet pump, the hull bottom plate including an opening; and a speed detection unit disposed at the opening, said water jet propulsion watercraft detecting a propulsion speed of the hull by using the speed detection unit at the opening adapted to be operated with water when the hull is propelled by the water jet pump; wherein the hull bottom plate includes a guide groove disposed in a fore-aft direction at an area of the hull bottom plate excluding at least a front portion thereof, the guide groove guides water rearwardly of the hull; and wherein the hull bottom plate includes a flat surface formed at a front portion of the guide groove and on a surface facing the water and the flat surface includes the opening.