Patent Publication Number: US-2018029679-A1

Title: Fluid outlet interface for personal watercraft

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of patent application Ser. No. 14/534,753, filed Nov. 6, 2014, entitled “FLUID OUTLET INTERFACE FOR PERSONAL WATERCRAFT, ASSOCIATED PERSONAL WATERCRAFT AND PROPULSION SYSTEM,” which application claims priority to U.S. Provisional Patent Application Ser. No. 61/901,690, filed Nov. 8, 2013 and claims priority to France Application Serial No. FR1451896, filed Mar. 7, 2014, the entirety of all of which is incorporated herein by reference. 
    
    
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     n/a 
     FIELD OF THE INVENTION 
     The present disclosure relates to a fluid outlet interface for a Personal Watercraft, hereinafter referred to as PWC. Such an interface makes it possible to adapt a PWC so that it operates as a fluid compression/pressurization station in addition to its primary transportation function. Such a PWC can compress/pressurize and thus deliver said fluid to a third-party device. Preferably and non-limitingly, such a PWC can supply power to a propulsion device for a passenger so that the latter can travel in the air or within a fluid. 
     BACKGROUND OF THE INVENTION 
       FIG. 1  shows an example embodiment of a propulsion device  10  designed by the builder ZAPATA RACING. This device includes a main body in the form of a substantially planar platform  11  on which a passenger  1  can be positioned. The propulsion device described relative to  FIG. 1  includes a thrust system cooperating with the platform  11 . Such a thrust system includes one or more primary nozzles, the function which consists of propelling the device and its passenger. In the present document, we use the term “nozzle” to define a profiled channel element, intended to impose an increased speed on a flowing fluid. This increased speed of the fluid is primarily due to a difference in sections between the inlet and the outlet of the element, the outlet section being smaller than the inlet section. According to  FIG. 1 , such a thrust system consists of a pair of primary nozzles  12   a  and  12   b  fastened against the lower face of the platform  11 . The respective fluid discharge directions of said nozzles are oriented along a normal to the platform  11 , advantageously from close to the lower face  11   b  of the platform  11  toward a distance therefrom. The thrust system of such a propulsion device may further include two secondary and optional nozzles  13   a  and  13   b  to facilitate its maneuverability. These are free and designed optionally and respectively to be held by a passenger  1  at the forearms or hands. In order to deliver a sufficient thrust force and allow takeoff, then movement, includes means the for propulsion collecting device  10  further and distributing the pressurized fluid, for example water, to the primary and secondary nozzles. Such a fluid is preferably conveyed using a flexible supply pipe  2  from a remote compression station, not shown in  FIG. 1 . Such a supply pipe may be made from a material traditionally making up a fire hose or any other material having the necessary strength for the pressure exerted by the pressurized fluid. A collector  14  may thus have a base  14   c  to which an end  2   a  of a supply pipe  2  is connected, 20 for example using a rib suitable for receiving said pipe  2 . In  FIG. 1 , the collector  14  may have a shape close to a “Y” for collecting, from the base  14   c , and distributing, via arms, the pressurized fluid to the primary pipes  12   a  and  12   b , respectively. The end  2   a  of 25 the supply pipe  2  may advantageously cooperate with the collector  14  at its base  14   c  using a pivot link to allow a free rotation r 2  around an axis C substantially parallel to the pipe  2 . The device can thus pivot freely around said axis C without creating loops or excessive stresses on the supply pipe  2 . 
     In order to distribute the pressurized fluid to the secondary nozzles  13   a  and  13   b , for example and as indicated in  FIG. 1 , secondary pipes  18   a  and  18   b , in the advantageous form of flexible hoses, can be 35 provided to deliver said pressurized fluid from the collector  14  to the secondary nozzles. In order to avoid bothering the passenger  1 , said secondary nozzles can be guided along the back up to the shoulders by using maintaining means  19  such as straps, harnesses, etc. A passenger may further use means to restrain the secondary nozzles at forearm level. 
     The platform  11  may have means for maintaining a passenger on the upper face of said platform  11 . Thus, depending on the preferred position of a passenger on the platform, said maintaining means may consist as indicated in  FIG. 1  of a pair of booties or fastening boots  16  of a type similar to what may for example be used in wakeboarding. 
     A propulsion device, for example the device  10  described relative to  FIG. 1 , may be supplied by any fluid compression station, as far as it is able to deliver a fluid whereof the pressure is sufficient to ensure operation of the propulsion device. The latter may be remote and dedicated to that use at the risk of increasing the overall cost of a propulsion system including a propulsion device, a compression station and a supply pipe cooperating with said device and station to convey the pressurized fluid. 
     In order to decrease such a cost, the compression station may advantageously be chosen to be an apparatus whereof the primary and original function is different from the function consisting of supplying pressurized fluid to a propulsion device. It is thus possible to take advantage of the original compression capacity with respect to a fluid of a PWC, for example the RUNABOUT MZR 2011 edition from the builder ZAPATA RACING. 
     One such vehicle  30 , a side view of which is described relative to  FIG. 2 , includes a hull  31  and houses propulsion means  32  compressing a fluid by spinning an impeller, on the surface of which the PWC navigates, said fluid being ingested from an inlet  33  arranged below the hull  31 . Said fluid, thus pressurized, is expelled from a fluid outlet situated at the rear of the vehicle. Such a fluid outlet generally assumes the form of a cone cooperating with a directional, not shown in  FIG. 2 , to modify the trajectory of the PWC. The means  32  are generally driven using a heat engine, also not shown in  FIG. 2 . To adapt such a PWC and divert the original function of the propulsion means  32 , so that the latter deliver a pressurized fluid and for example supply a propulsion device like that described relative to  FIG. 1 , it is known to position and apply a flange or more generally an interface  100  to the pressurized fluid outlet of the means  32  of the PWC  30 . This interface  100  may be designed so as simply to be able to adapt to the fluid outlet of any PWC or, alternatively, to be dedicated to one type of fluid outlet if it differs from one PWC to another. According to a first embodiment, such an adaptation method further consists of connecting a tip  2   b  of a supply pipe for conveying the pressurized fluid expelled from the fluid outlet of the PWC to a collector  34  cooperating with said interface  100 . The distal part  2   a  of said supply pipe  2  cooperates with the means for collecting and distributing the pressurized fluid  14  to the nozzles of a propulsion device, like the device  10  described relative to  FIG. 1 . The PWC can thus interact with such a device as a remote fluid compression station. 
     In order to avoid a submersion risk of the PWC, if the latter was pulled from its bow by the propulsion device, the adaptation of a PWC advantageously consists further of inserting, between the collector  34  and the proximal part  2 , a connecting elbow  36 , arranged substantially in a “U” to orient the pressurized fluid to the outlet of said elbow along an axis substantially parallel to the hull  31  of the PWC toward the bow of said PWC. Use will advantageously be made of attaching means to moor said pipe  2  to a towing hook  37  situated at the bow of the PWC. This creates a guide for guiding the supply pipe from the stern to the bow of the PWC, preserving the navigability and compression capacities of said PWC. A propulsion device can thus move in the air or below the surf ace of the water while pulling the PWC by the front thereof. 
     Depending on the agitation of the expanse of water on which a propulsion system moves, such a system being made up of a propulsion device, a supply pipe and a remote fluid compression station, there is still a risk of the PWC becoming submerged. In fact, the laps or waves colliding with the hull of the PWC, or even the pressurized water potentially discharged from a propulsion device near the PWC, can flood the bilge of a traditional PWC. The latter generally includes an internal system for emptying the bilge working with a Venturi ejector emerging in a directional cone cooperating with the fluid outlet of the PWC. The replacement of said directional cone by placing the interface  100 , to divert the pressurized fluid toward the pipe  2 , makes said original bilge emptying system inoperative. During the movement of the PWC, when the latter is for example pulled by a propulsion device  10 , as described relative to  FIG. 1 , the bilge of said PWC may fill with water gradually, encumbering the navigability of the PWC. The user of the PWC must therefore suspend its movement regularly to bail out the bilge of his PWC manually or use an additional device, for example a bilge pump, to empty said bilge. This problem may become tedious if a manual operation is necessary and increases the acquisition and maintenance costs of the equipment. Furthermore, adding such a bilge pump is sometimes rather difficult. It must be possible to identify an appropriate housing for said pump within the PWC. The latter must also be fastened on the hull of the PWC as well as one or more discharge or emptying pipes for discharging water from the bilge. Such fastenings do not make it possible to preserve the integrity of the hull of the PWC. They may even quite simply prove impossible in the case of rented equipment. Furthermore, it is necessary to 10 provide an electricity supply for said bilge pump, which further complicates the use of that additional pump. One alternative may consist of having an offboard Venturi effect ejector at a third-party device supplied with pressurized fluid by the PWC, for example on a fluid outlet of the thrust system of said device. However, such a solution would require providing an emptying pipe connecting the fluid outlet of the thrust system to the bilge of the PWC. Such an arrangement would be technically restrictive, as well as globally inoperative, or even dangerous. In fact, depending on the length of said emptying pipe and/or the height difference between the ends of the emptying pipe, the pressure loss within the pipe would encumber or even cancel the suction generated by the ejector. The emptying of the bilge would thus be largely or completely ineffective, or could even transform into filling of the bilge, which could risk causing submersion of the PWC. 
     SUMMARY OF THE INVENTION 
     The disclosure involves avoiding the above-described drawbacks by proposing a particularly innovative arrangement of a fluid outlet interface. The many advantages provided by the disclosure include the fact that the interface includes means for ejecting fluid present in a bilge of a PWC, not requiring any structural modification or alteration of the PWC. Such an arrangement makes it possible to give the PWC a very high-performing bilge emptying system, by recreating a Venturi effect ejector with a sufficient flow rate to effectively and continuously empty the bilge of a PWC, when it supplies a third-party device with pressurized fluid. An interface according to the disclosure does not generate a noticeable loss of compression output and preserves the original sucking ports and bilge emptying pipes. It is therefore no longer necessary to modify the structure of the hull of the PWC or incorporate an additional bilge pump therein. 
     To that end, an interface is provided for cooperating with the fluid outlet of a personal watercraft pressurizing said fluid. Said interface includes a front face arranged to cooperate with said fluid outlet and a rear face. Said interface further includes a main opening, the axis of revolution of said main opening being normal to the front face of the interface, the proximal cross-section of said main opening having dimensions and a shape that are similar to those of the section of said fluid outlet. In order to create a Venturi effect ejector causing emptying of the bilge of said vehicle, the interface includes a recess arranged in its thickness, said recess emerging in the main opening to form a port collecting part of the pressurized fluid, when the latter passes through the main opening of the interface. Furthermore, the interface cooperates with the distal part of an emptying pipe, said distal part of the emptying pipe emerging from the rear face of the interface jointly with the recess by a through hole, the section of said through hole having dimensions larger than those of the section of the outer wall of the distal part of the emptying pipe. 
     According to one advantageous embodiment, the recess may include a shoulder in the form of a resultant first hole emerging in the main opening, the section of which is that of the collecting port, and a second, blind hole, with a section concentric to the section of the first through hole, the and the dimensions of which are larger than those of said section of the first through hole, the two holes being arranged from the outer wall of the interface. To avoid encumbering the collecting port, the disclosure provides that such an interface may include a grate affixed against the shoulder of the recess, said grate being substantially planar and having dimensions substantially the same as those of the section of the recess upstream from the shoulder. 
     To fasten said grate advantageously, the recess may be pierced-tapped and blind from the outer wall of the interface to cooperate with one or more tightening screws, the respective lengths of said screws being determined so that said screws, passing through an occluder plate having dimensions larger than those of the section of the recess when said recess emerges from the outer wall of the interface, and bearing against the grate, mounts the occluder plate and said grate tightly against the outer wall of the interface and the shoulder, respectively. 
     To maintain an optimal output of the suction of fluid blocking a bilge of the vehicle, irrespective of the navigability conditions of said vehicle, an interface according to the disclosure may include an additional fluid ejector cooperating with the rear face of the interface and the orifice of the through hole. 
     According to one advantageous embodiment, the additional ejector may include a tubular and hollow main body. 
     In order to fasten such an additional ejector on the interface, the proximal part of the additional ejector may advantageously be threaded to cooperate with the orifice of the through hole, the part forming the latter being tapped beforehand. 
     In order to improve the yield of the additional ejector, the proximal part thereof may include an insert cooperating with the main body of said additional ejector. 
     In order to favor the ejection of the fluid at the outlet of the interface, the inner wall of the proximal part of the insert may then advantageously describe a convergent cone arranged to surround the distal part of the emptying pipe, said cone and said distal part of the emptying pipe being mutually arranged to form an annular interstice within which the fluid, coming from the collecting port, can flow between the outer wall of the distal part of the emptying pipe and the outer wall of the proximal part of the insert. 
     In order for the additional ejector to be able to cause the ejected fluid to flow optimally, like a tap, it is interesting to slow the flow speed within the insert. The latter may further be arranged so that the inner wall of the distal part of said insert describes a divergent cone. 
     In order to create a turbulent flow of the fluid within the main body of the additional ejector, the inner wall of said main body may include ribs. 
     In order to fasten the insert within the main body of the additional ejector, the outer wall of said insert may include teeth arranged to cooperate with the inner ribs of said main body of the ejector. 
     According to a second subject-matter, to divert a personal watercraft from its original function and convert it into a fluid pressurization station, the disclosure provides for adapting a personal watercraft including a hull, propulsion means compressing, by spinning an impeller/turbine, a fluid ingested from an inlet and expelling said fluid thus pressurized from a fluid outlet at the rear of said vehicle, an emptying system for emptying a bilge including an emptying pipe, the proximal part of which emerges in said bilge, so that said vehicle includes an interface according to the disclosure, said interface cooperating with the distal part of said emptying pipe. 
     Such a personal watercraft thus adapted makes it possible to form a propulsion system, including a propulsion device having a body arranged to receive a passenger and cooperating with a thrust system supplied with pressurized fluid from said personal watercraft. 
     In order to convey the fluid pressurized by said vehicle, such a system may include a supply pipe cooperating on the one hand with the propulsion device and on the other hand with the rear face of the interface of the vehicle so that said vehicle delivers the pressurized fluid to the device via the supply pipe. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A more complete understanding of the present disclosure, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein: 
         FIG. 1  shows an example of a propulsion device with a passenger, said device being supplied with pressurized fluid; 
         FIG. 2  describes a PWC suitable for delivering a fluid pressurized by spinning a turbine/impeller via an outlet interface by means of a supply pipe; 
         FIG. 3  describes a fluid outlet interface according to the disclosure; 
         FIG. 4  describes a view of the front face of a fluid outlet interface according to the disclosure, said interface being connected to a connecting elbow for a supply pipe; 
         FIG. 5  describes a view of the rear face of a fluid outlet interface according to the disclosure, said interface being connected to a connecting elbow for a supply pipe; 
         FIG. 6  describes a cross-section of a fluid outlet interface according to the disclosure; 
         FIG. 7  describes a partial view of a longitudinal cross-section of a fluid outlet interface according to the disclosure; 
         FIG. 8  shows a fluid outlet interface according to the disclosure including an additional fluid ejector; 
         FIG. 9  shows a cross-section of a fluid outlet interface according to the disclosure including an additional fluid ejector; and 
         FIG. 10  describes a partial enlargement of the cross-section of an additional fluid ejector for a fluid outlet interface according to the disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Thus, the disclosure provides for adapting a fluid outlet interface of the PWC, so that the latter can collect and divert a very small portion of the fluid pressurized by the PWC and thus create a sufficient Venturi effect to drive the emptying of the bilge of said PWC. Such a solution may be used on any floating device, irrespective of whether it is able to carry a passenger, that may deliver a pressurized fluid to a third-party device. In the rest of this document, the terms “personal watercraft” or “PWC” encompass any floating device supplying pressurized fluid to a third-party device. 
     According to  FIG. 3 , a first embodiment of an interface  100  according to the disclosure consists of a plate having a first face F 1 , called “front face”, designed to cooperate, for example fastened using bolts, with the fluid outlet of the propulsion means  32  of the PWC, like that described relative to  FIG. 2 . This front face F 1  is therefore arranged to be pressed against said fluid outlet. The plate of the interface  100  includes a second face F 2 , called “rear face”, designed to cooperate, for example fastened using bolts, with the collector  34 , like that described relative to  FIG. 4 . Said plate, said collector  34  or even elbow  36  or any intermediate additional element between said rear face F 2  of the plate and a pipe for delivering the pressurized fluid, crossing through said plate, could constitute only one single entity that we will hereinafter encompass using the term “interface”. 
     The rear face F 2  could alternatively cooperate with a directional or power limiting means, in the form of a directional cone or steerable flaps. The interface  100  includes an opening Op substantially compliant with the configuration or shapes, and dimensions, of said fluid outlet of the pressurization/compression means  32  of the PWC. It generally has a circular section. The main opening could, however, the arranged to include front and rear faces with different sections, both in terms of dimensions and/or shape. The interface  100  may thus have a gradual transformation function for the fluid outlet section along its thickness. As an example, the front face F 1  could have a circular section and the rear face could have an oval or oblong section. Irrespective of the arrangement of the main opening Op, on the periphery thereof, the interface  100  includes one or more secondary openings, or through holes, oriented along a normal shared by the faces F 1  and F 2  of the interface  100 . These secondary openings may preferably be oblong so as each to receive a fastening bolt, or equivalent fastening means, to affix the interface  100  against the fluid outlet of the propulsion means of the PWC. 
     In order to collect part of the fluid pressurized by the PWC and thus create a particularly clever and effective Venturi ejector, the interface  100  includes, in its thickness, a recess  106  with a substantially oval or rectangular section. This recess  106  emerges within the main opening Op to form a collecting port  108  for collecting part of the pressurized fluid passing through said main opening Op. Such a collecting port  108  is described relative to  FIG. 4  showing an enlargement of the inner wall of the main opening Op of the interface  100  when the latter cooperates, as one non-limiting example, with a conical collector  34  and an elbow  36 . 
     Such a recess  106  may be defined as the resultant of a first through hole in the main opening Op, the section of which is that of the collecting port  108 , and a second blind hole, with a section concentric to the section of the first through hole and the dimensions of which are larger than those of said section of the first through hole, the two holes being arranged from the outer wall of the interface  100 . Such a recess  106  thus has a shoulder E as described relative to  FIG. 7 . The latter describes an enlargement of the longitudinal section of the interface  100 , i.e., along the plane of symmetry of said recess normal to the axis of revolution of the main opening Op. The dimensions of the port  108  are thus preferably smaller than those of the section of the recess  106  on the periphery of the interface  100 . 
     In this way, the disclosure provides that a grate  104 , arranged to filter any bodies ingested by the propulsion means of the PWC, can advantageously be affixed against the shoulder E to preserve the flow of fluid penetrating via the collecting port  108 , as indicated in  FIG. 3 . The grate  104 , which is substantially planar, may advantageously be arranged to have dimensions substantially similar to those of a section of the recess  106  upstream from the shoulder E. 
     As indicated in  FIG. 3 , the recess  106  may be pierced-tapped and blind  110  from the outer wall of the interface  100  to receive one or more tightening screws  102 . The respective lengths of said screws will advantageously be adjusted and determined so that they pass through an occluder plate  105 , with dimensions larger than those of the section of the recess  106 , and bear against the grate  104 , tightly mount said occluder plate and the grate against the outer wall of the interface and the shoulder E, respectively. The occluder plate  105  thus makes it possible to close the recess  106  and ensure the tightness thereof on the side of the outer wall of the interface  100 . 
     As indicated by  FIGS. 3 and 6 , the interface  100  further includes a through hole  107  along a normal shared by the front F 1  and rear F 2  faces and passing through the recess  106 . This hole makes it possible to establish two new recesses or bores respectively emerging on said front F 1  and rear F 2  faces. The recess emerging on the front face F 1  is provided advantageously to include a circular section with a diameter d 1  smaller than that d 2  of the circular section of the second through recess of the rear face F 2 . 
     The diameter d 1  is advantageously adjusted to be substantially identical to that of the distal part of the pipe  103  of the bilge emptying system of the PWC, with inner diameter d 3 . Said pipe  103  advantageously emerges from the hole  107  at the rear face F 2 . Alternatively, the element  103  consists of a substantially cylindrical adapter, the distal part of which, emerging from the front face F 1 , includes ribs provided to cooperate with the inner wall of said pipe of the emptying system, said pipe being comparable to a hose with a constant section. 
     The mutual arrangement of the recess  106  and the hole  107  thus makes it possible, after inserting the end of the pipe or adapter  103  into said hole  107  from the front face F 1  of the interface  100 , to create a flow of pressurized fluid, from the collecting port  108 , along the recess  106 , within the hole  107  emerging from the rear face F 2  of the interface  100 . In fact, in light of the outer diameter d 1  of the emptying pipe  103  and the diameter d 2  of the section of the hole  107  emerging from the rear face F 2 , an annular interstice  200   i , in the vicinity of one to two millimeters thick, is arranged or left free, between the outer wall of the emptying pipe  103  and the wall of the interface forming the hole  107 , to eject said flow. Such a fluid creates a sufficient vacuum to suction the content of the emptying pipe  103 , the distal part of which is flush with the rear face F 2  of the interface  100 , and therefore the fluid obstructing the bilge of the PWC, if the proximal part of said emptying pipe  103  is positioned at the bilge bottom of said PWC. This is in particular the case if said emptying pipe  103  is a pipe of the original bilge emptying system of the PWC. A Venturi ejector is thus created at the interface  100 . 
     The disclosure further provides that a plurality of recesses  106 - 107  can be arranged to connect a plurality of pipes  103 , respectively. 
     This first embodiment with a Venturi ejector at the interface  100  procures a particularly high-performing emptying system. It is thus possible to observe a suction in the vicinity of one thousand liters per hour, which makes it possible to maintain an unobstructed PWC bilge. 
     Such an arrangement may lose some of its efficiency when the recess  107  does not constantly emerge below the float line of the PWC. In fact, such an ejector has its best output when the hole  107  emerging from the rear face F 2  of the interface  100  is submerged. Based on the movements of the PWC on the surface of the water or along the waves, the hole  107  may emerge. 
     The disclosure provides an alternative embodiment of an interface including a fluid ejector to resolve this drawback and thus maintain optimal output irrespective of whether the hole  107  emerging from the rear face is submerged. According to this alternative, an additional fluid ejector is positioned on the end of the hole  107  emerging from the rear face F 2  of the interface  100 . Such an additional device  200  is illustrated by  FIGS. 8 to 10 . 
     Thus,  FIG. 8  has a fluid outlet interface  100  according to the disclosure including said additional fluid ejector  200 . The latter advantageously includes a tubular and hollow main body. Its length is predetermined and suitable for the desired performance. As one non-limiting example, such a length is approximately eight centimeters to procure an effective fluid ejection for emptying a bilge of a PWC. The proximal part of the additional ejector  200  cooperates with the rear face F 2  of the interface  100 , along a normal thereto, and with the orifice of the through hole  107 . To fasten the additional ejector  200  on the interface  100 , the wall forming said hole  107  is advantageously tapped. The outer proximal part of said ejector  200  is threaded to cooperate with the tapped wall forming said hole  107 . Other fastening methods for fastening the additional ejector  200  on the rear face F 2  of the interface  100  could be considered. The two elements could alternatively form a single and same entity. 
       FIG. 9  describes a cross-section of a fluid outlet interface  100  according to the disclosure and including an additional fluid ejector  200 , in a plane comprising the axis of revolution of said additional ejector  200 . According to this  FIG. 9 , the ejector  200  includes an insert cooperating with the proximal part of the ejector  200 . The outer proximal part emerging from said insert is threaded to cooperate with a wall forming the hole  107 , when the latter is tapped beforehand. The section of the inner wall of the insert may be constant. However, in order to improve the performance of the interface  100  according to the disclosure, the proximal part of the insert may have an inner wall describing a convergent cone  201 . Furthermore, the distal part  203  of the emptying pipe or the adapter  103  is advantageously flared to describe a divergent cone. This distal part may result from the use of a coupler, for example made from a non-oxidizable material, cooperating with the element  103  and flush with the rear face F 2  of the interface  100  within the recess  107 . The convergent cone  201  is advantageously arranged and sized to surround the distal part  203  of the emptying pipe  103 . This mutual arrangement of the elements  203  and  201  makes it possible to arrange an annular interstice  200   i  within which the fluid, coming from the collecting port  108 , flows. The latter flows between the outer wall of the distal part  203  of the emptying pipe  103  and the outer wall of the proximal part  201  of the insert. The thickness of said interstice  200   i  decreases when the fluid comes closer to the rear face F 2  of the interface  100 , in order to accelerate said fluid and favor its ejection. The insert, within the additional ejector  200 , may furthermore be arranged to describe an inner wall in the form of a divergent cone  201 . Said insert thus advantageously describes two parts: a proximal part in the form of a convergent cone, and a distal part in the form of a divergent cone. However, the arrangement of the insert is such that its inner wall does not have any marked discontinuity or shoulder. The height of the divergent cone  202  is advantageously greater than that of the convergent cone  201 . The latter is substantially equal to the depth described by the hole  107  when the latter passes through the rear face F 2  to emerge in the pipe  106 . The height of the cone  202  is determined to gradually reduce the speed of the ejected fluid. As a non-limiting example, said heights are in the vicinity of ten millimeters for the cone  201  and 30 millimeters for the cone  202 , when the main body of the ejector  200  has a length of approximately twenty-four millimeters. Other dimensions may, however, be used. To avoid any pressure loss, the divergent cone  202  emerges, at its distal part, against the inner wall of the cylindrical main body of the ejector  200 . In other words, the inner end section of the insert is substantially equal to that of the inner wall of said body. To offer good adhesion of the insert within the cylindrical body of the ejector  200 , the diameter of the section of the outer wall of said insert is substantially identical to that of the inner wall of the main body of the ejector  200 . 
     Surprisingly, if the inner wall of the main body of the additional ejector advantageously has ribs, i.e., has discontinuities  200   c  with repeated sections, the flow of the fluid coming from the insert is no longer laminar, but becomes turbulent. Jointly with the slowing effect of the cone  202 , the asperities or ribs  200   c  cause filling of the distal part of the ejector  200 , which delivers the ejected fluid, like a tap. On the one hand, the flow rate and section are maximized as a result, but above all, the inner distal part of the additional ejector  200  is kept filled with fluid, whether the latter is submerged or emerges from the water or fluid on which the PWC is traveling. Such an arrangement of the main body of the ejector may be likened to a sheath portion for electrical ducts that one wishes to embed in a partition. Thus, the main body of the additional ejector  200  may include, as indicated in  FIG. 9 , ribs  200   c  over its entire height, on its inner wall, or even on its outer wall. In order to increase the strength of said main body on the insert of the ejector  200 , with the exception of the advantageously threaded proximal portion substantially corresponding to the inner cone  201  and cooperating with the wall forming a hole  107 , the outer wall of said insert may include teeth  205  arranged to cooperate with the ribs or inner striations  200   c  of the main body of the ejector  200  as indicated in  FIG. 10 , the latter illustrating a partial enlargement of the cross-section of an additional fluid ejector  200  for a fluid outlet interface  100  according to the disclosure. 
     It will be appreciated by persons skilled in the art that the present disclosure is not limited to what has been particularly shown and described herein above. In addition, unless mention was made above to the contrary, it should be noted that all of the accompanying drawings are not to scale. Of note, the system components have been represented where appropriate by conventional symbols in the drawings, showing only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein. Moreover, while certain embodiments or figures described herein may illustrate features not expressly indicated on other figures or embodiments, it is understood that the features and components of the examples disclosed herein are not necessarily exclusive of each other and may be included in a variety of different combinations or configurations without departing from the scope and spirit of the disclosure. A variety of modifications and variations are possible in light of the above teachings without departing from the scope and spirit of the disclosure, which is limited only by the following claims.