Watercraft

Abstract

The invention relates to a watercraft, in particular a swimming and/or diving aid with a hull (10) having a stern (12) and a bow (11), wherein two flow channels (27) are provided in the hull (10) or on the hull (10), which flow channels extend from a water inlet (22) to a water outlet (24), wherein a water acceleration device (52), in particular a propeller or a propelling screw, is arranged in each of the two flow channels (27), wherein each water acceleration device (52) is driven by a motor (50), wherein handles (31) a user can hold on to are arranged in the midship area between the bow (11) and the stern (12) or in the bow area, wherein a support surface (40) is provided adjoining the handles (31) in the direction of the stern (12), on which support surface the user can at least partially rest, and wherein two spaced-apart bulges extending in the longitudinal direction of the hull (10) are provided on the underside of the hull (10), between which bulges at least one water-sliding surface (14, 15) is arranged. To be able to implement a low flow resistance with a compact structure in such a watercraft, provision is made according to the invention that the flow channels (27) extend at least sectionally in the area of the bulges.

1 - 16  (canceled) 
     
     
         17 . A watercraft, comprising:
 a hull including a stern and a bow defining a longitudinal direction between the stern and the bow, the hull including an underside including two laterally spaced-apart bulges extending in the longitudinal direction, and the hull including at least one water-sliding surface between the two bulges;   two flow channels, one of the flow channels being provided at least partially in each of the two bulges, each of the flow channels extending from a water inlet to a water outlet;   two water acceleration devices each including a propeller or a propelling screw, one of the water acceleration devices being arranged in each of the two flow channels;   two motors, one of the motors driving each of the two water acceleration devices;   two handles arranged on the hull on a midship area between the bow and the stern or in a bow area; and   a support surface defined on the hull aft of the handles such that a user can hold onto the handles and at least partially rest on the support surface.   
     
     
         18 . The watercraft of  claim 17 , wherein:
 each of the two flow channels includes its own water inlet located in its associated one of the two bulges.   
     
     
         19 . The watercraft of  claim 18 , wherein:
 each of the water inlets is open towards an underside of its associated one of the two bulges and/or towards a space between the two bulges.   
     
     
         20 . The watercraft of  claim 17 , wherein:
 each of the two flow channels includes its own water outlet open towards a rear of the watercraft.   
     
     
         21 . The watercraft of  claim 17 , further comprising:
 two flow stators, one of the flow stators being arranged in each of the two flow channels downstream of a respective water acceleration device in a direction of flow, the flow stators being configured to reduce or eliminate a swirl of the water downstream of the respective water acceleration devices.   
     
     
         22 . The watercraft of  claim 21 , wherein:
 each of the motors is arranged in the hull outside of the respective flow channel in which its associated water acceleration device is arranged, the two motors being arranged on opposite sides of a central longitudinal axis of the watercraft.   
     
     
         23 . The watercraft of  claim 22 , wherein:
 the two motors are housed in one joint flooding compartment or in separate flooding compartments configured to be flooded with ambient water when the watercraft is placed in a body of water.   
     
     
         24 . The watercraft of  claim 23 , wherein:
 the flooding compartment or compartments are connected to an exterior environment through at least one water inlet port and at least one water outlet port, the at least one water inlet port and the at least one water outlet port being arranged offset from each other in the longitudinal direction of the hull to generate a water flow through the flooding compartment or compartments during operation of the watercraft.   
     
     
         25 . The watercraft of  claim 17 , wherein:
 the hull includes two lateral outriggers and each of the two bulges is a part of a respective one of the two lateral outriggers.   
     
     
         26 . The watercraft of  claim 25 , wherein:
 the two motors are housing in separate flooding compartments, one of the flooding compartments being provided in each of the two lateral outriggers, the flooding compartments being configured to be flooded with ambient water when the watercraft is placed in a body of water.   
     
     
         27 . The watercraft of  claim 17 , wherein:
 each of the motors is configured to be controlled and/or regulated separately.   
     
     
         28 . The watercraft of  claim 17 , wherein:
 each of the two handles includes control elements associated with a respective one of the two motors such that the control elements of one of the handles can be used to regulate a power output of one of the motors, and the control elements of the other of the handles can be used to regulate a power output of the other of the motors.   
     
     
         29 . The watercraft of  claim 17 , further comprising:
 a joint power supply configured to supply power to both of the motors.   
     
     
         30 . The watercraft of  claim 17 , further comprising:
 two power supplies, each of the power supplies being configured to supply power to a respective one of the motors.   
     
     
         31 . The watercraft of  claim 30 , wherein:
 the two power supplies are housed in one joint flooding compartment or in separate flooding compartments configured to be flooded with ambient water when the watercraft is placed in a body of water.   
     
     
         32 . The watercraft of  claim 17 , wherein:
 the motors are configured such that a direction of rotation of the motors can be individually or jointly reversed such that a thrust direction of each of the associated water acceleration devices can be reversed.   
     
     
         33 . A watercraft, comprising:
 a hull including a stern and a bow defining a longitudinal direction between the stern and the bow;   two flow channels provided in or on the hull, each of the flow channels extending from a water inlet to a water outlet;   two water acceleration devices each including a propeller or a propelling screw, one of the water acceleration devices being arranged in each of the two flow channels;   two motors, one of the motors driving each of the two water acceleration devices;   two handles arranged on the hull on a midship area between the bow and the stern or in a bow area;   a tilt sensor configured to qualitatively or quantitatively detect a tilt of the watercraft about a central longitudinal axis of the watercraft, the tilt sensor being configured to generate a signal representative of the tilt; and   a regulating device configured to control the two motors as a function of the signal from the tilt sensor such that the motors have a power output differing from one another when the watercraft is tilted.