Jet propulsion boat and propulsion boat

Abstract

A jet propulsion boat includes a boat body, an operation part operated by a driver on the boat body, a turning posture detector that detects a turning posture of the boat body when a driver performs operation of turning the boat body, a behavior adjustment actuator that adjusts a behavior of the boat body, and a controller that controls the behavior adjustment actuator based on the turning posture detected by the turning posture detector.

1 . A jet propulsion boat comprising:
 a boat body;   a first propulsion device that imparts propulsion force to the boat body by injection of a jet water flow; and   a second propulsion device that imparts propulsion force to the boat body with a mechanism independent of the first propulsion device.   
     
     
         2 . The jet propulsion boat according to  claim 1 , wherein
 the first propulsion device is a propulsion device of an engine type using an internal combustion engine as a power source, and   the second propulsion device is a propulsion device of an electric type using an electric motor as a power source.   
     
     
         3 . The jet propulsion boat according to  claim 2 , wherein
 the second propulsion device includes an impeller disposed in a water passage through which water flows, and the electric motor that rotationally drives the impeller to inject a water flow from the water passage.   
     
     
         4 . The jet propulsion boat according to  claim 1 , wherein
 the second propulsion device includes an impeller disposed in a water passage through which water flows, and a power source that rotationally drives the impeller to inject a water flow from the water passage, and   the water passage includes an inlet formed at a position exposed above a water surface when the jet propulsion boat is in a planing state.   
     
     
         5 . The jet propulsion boat according to  claim 3 , wherein
 the water passage includes an outlet formed at a position away from a center of gravity of the jet propulsion boat in a longitudinal direction.   
     
     
         6 . The jet propulsion boat according to  claim 1 , wherein
 the second propulsion device includes a longitudinal thruster that generates propulsion force for moving the boat body at least forward or backward.   
     
     
         7 . The jet propulsion boat according to  claim 6 , wherein
 the longitudinal thruster includes an impeller disposed in a water passage passing through the boat body, and a power source disposed inside the boat body to rotationally drive the impeller to inject a water flow in the longitudinal direction from one end of the water passage.   
     
     
         8 . The jet propulsion boat according to  claim 7 , wherein
 the water passage includes a pair of longitudinal openings opened in the longitudinal direction at two respective positions on left and right sides across a center axis of the boat body extending in the longitudinal direction.   
     
     
         9 . The jet propulsion boat according to  claim 8 , wherein
 the longitudinal thruster includes a mechanism that causes a water flow injected from the longitudinal opening on the left side to have a flow rate that is different from a flow rate of a water flow injected from the longitudinal opening on the right side.   
     
     
         10 . The jet propulsion boat according to  claim 9 , wherein
 the power source includes a first power source that generates power for injecting a water flow from the longitudinal opening on the left side, and a second power source that generates power for injecting a water flow from the longitudinal opening on the right side.   
     
     
         11 . The jet propulsion boat according to  claim 6 , wherein
 the longitudinal thruster is detachably attached to the boat body.   
     
     
         12 . The jet propulsion boat according to  claim 1 , wherein
 the second propulsion device includes a pair of longitudinal thrusters that each inject a water flow in the longitudinal direction from openings at opposite ends of corresponding one of a pair of left and right water passages extending in the longitudinal direction, and   each of the longitudinal thrusters has a mechanism that changes a direction of a water flow flowing through the corresponding one of the water passages.   
     
     
         13 . The jet propulsion boat according to  claim 1 , wherein
 the second propulsion device includes an impeller disposed in a water passage through which water flows, and a power source that rotationally drives the impeller, and   the power source is capable of changing a rotation direction of the impeller.   
     
     
         14 . The jet propulsion boat according to  claim 1 , further comprising:
 a pair of left and right sponsons protruding outward from corresponding left and right side surfaces of the boat body,   wherein the second propulsion device includes an impeller disposed in a water passage having an outlet in one surface of each of the sponsons, and a power source that rotationally drives the impeller to inject a water flow from the outlet of the water passage.   
     
     
         15 . The jet propulsion boat according to  claim 1 , wherein
 the second propulsion device includes a lateral thruster that generates propulsion force for moving the boat body at least leftward or rightward.   
     
     
         16 . The jet propulsion boat according to  claim 15 , wherein
 the lateral thruster includes an impeller disposed in a water passage passing through the boat body, and a power source provided inside the boat body to rotationally drive the impeller to inject a water flow in a lateral direction from one end of the water passage.   
     
     
         17 . The jet propulsion boat according to  claim 1 , wherein
 the second propulsion device is capable of generating propulsion force for moving the boat body in the longitudinal direction and propulsion force for moving the boat body in the lateral direction.   
     
     
         18 . The jet propulsion boat according to  claim 17 , wherein
 the second propulsion device includes a pair of left and right longitudinal thrusters that each generate propulsion force for moving the boat body at least forward or backward, and a lateral thruster that generates propulsion force for moving the boat body at least leftward or rightward.   
     
     
         19 . The jet propulsion boat according to  claim 18 , wherein
 the pair of longitudinal thrusters are disposed on the respective left and right sides of a rear part of the boat body in a posture in which an injection axis of a water flow faces the longitudinal direction, and   the lateral thruster is disposed in a front part of the boat body in a posture in which an injection axis of a water flow faces the lateral direction.   
     
     
         20 . A propulsion boat which planes on water in an inclined posture in which a bow rises, the propulsion boat comprising:
 a boat body;   a first propulsion device that imparts propulsion force to the boat body, the propulsion force capable of moving the propulsion boat in a planing state; and   a second propulsion device that imparts propulsion force to the boat body with a mechanism independent of the first propulsion device,   wherein the second propulsion device includes an impeller disposed in a water passage through which water flows, and a power source that rotationally drives the impeller to inject a water flow from the water passage, and   the water passage includes an entrance formed at a position exposed above from a water surface when the propulsion boat is in a planing state.