Marine prppelling system

Abstract

A marine propelling system for a boat includes a guide shell having a guideway for guiding a water flow to pass therethrough; a propelling member having a main body and a propeller; a vortex guide member mounted to an outlet of the main body and extending backward; a horizontally steering ring sleeved onto a peripheral edge of a front section of the vortex guide member, a vertically steering ring sleeved onto a peripheral edge of a rear section of the vortex guide member; and an inverted guide hood mounted to a rear side of the vortex guide member. When the propeller is rotated, a water flow enters through the guideway and is then pressurized by the propeller to become a vortex flow ejected outward for providing the boat with a propulsive force. In this way, marine propelling system can greatly enhance the steering maneuverability and the safety of the boat.

1 . A marine propelling system for a boat, comprising:
 a guide shell having a streamline guideway for a water flow to pass through;   a propelling member having a main body and a propeller, the propeller being rotatably connected with the main body;   a vortex guide member having an end combined into the main body and extending backward from an outlet end of the main body; and   at least one steering ring sleeved onto a peripheral edge of the vortex guide member for linking-up with the vortex guide member to wag toward a predetermined direction.   
     
     
         2 . The marine propelling system as defined in  claim 1 , wherein the vortex guide member is flexible and can be forced to wag. 
     
     
         3 . The marine propelling system as defined in  claim 1 , wherein the at least one steering ring is a horizontally steering ring sleeved onto a front section of the peripheral edge of the vortex guide member, whereby the horizontally steering ring can be driven by a first driving device for linking-up with and forcing the vortex guide member to wag leftward or rightward. 
     
     
         4 . The marine propelling system as defined in  claim 1 , wherein the at least one steering ring is a vertically steering ring sleeved onto a rear section of the peripheral edge of the vortex guide member, whereby the vertically steering ring can be driven by a second driving device for linking-up with and forcing the vortex guide member to wag upward or downward. 
     
     
         5 . The marine propelling system as defined in  claim 1  further comprising an inverted guide hood and a strut, wherein the inverted guide hood comprises two guide portions curved toward the propelling member, and the strut comprises two ends, one of which is connected with the inverted guide hood and the other is pivoted to an external surface of the main body of the propelling member, whereby the inverted guide hood can be driven by a third driving device via the strut relative to the propelling member to shift between a first position, where the inverted guide hood is located behind the vortex guide member, and a second position, where the inverted guide hood is located away from the vortex guide member. 
     
     
         6 . The marine propelling system as defined in  claim 5 , wherein the inverted guide hood comprises a cross-shaped deflector formed at an internal periphery thereof. 
     
     
         7 . The marine propelling system as defined in  claim 1 , wherein the main body of the propelling member comprises a housing, a support axial tube, and a plurality of fixed wings, the support axial tube being mounted to a center of an internal side of the housing, the fixed wings being fixed to an external side of the support axial tube and arranged in the shape of a cross; the vortex guide member is mounted to a rear end of the housing; the propeller comprises a rotary shaft and a plurality of blades, the rotary shaft being rotatably inserted into the support axial tube, the blades being connected with a distal end of the rotary shaft. 
     
     
         8 . The marine propelling system as defined in  claim 7 , wherein the main body of the propelling member further comprises a pair of water-baffling wings mounted to an external side of the housing and located at two opposite sides of the housing respectively. 
     
     
         9 . The marine propelling system as defined in  claim 7 , wherein the main body of the propelling member further comprises a stabilizing wing, wherein the stabilizing wing is mounted to an external side of the housing and located at a bottom side of the housing.