Device and system for propelling a passenger

Abstract

A propulsion device including a platform on which a passenger is positioned, said platform comprising an upper surface and a lower surface, and cooperating with means for collecting and distributing a pressurized fluid to a primary nozzle expelling said fluid from a fluid outlet in a given direction, said means being supplied with pressurized fluid by a fluid supply conduit, the device being characterized in that: the primary nozzle is oriented substantially from the bow to the stern of the platform; the fluid expulsion direction fits in a median plane of the platform; the fluid expulsion direction of the primary nozzle describes an angle comprised between 10 and +45 with a longitudinal axis of the platform contained in said median plane.

Claims

1. A propulsion device, comprising: a platform defining an upper surface, a lower surface, a bow, and a stern, wherein the platform defines a longitudinal axis extending from the bow to the stern; a fluid collector coupled to the lower surface of the platform such that at least a portion of the fluid collector extends below the upper surface of the platform, the fluid collector being positioned at the stern of the platform and facing in a bow-to-stern direction such that fluid enters the fluid collector in a stern-to-bow direction; a flexible fluid supply conduit coupled to the fluid collector for providing pressurized fluid to the collector; and a primary nozzle in fluid communication with the fluid collector and configured to expel a fluid towards the stern, wherein the primary nozzle is selectively adjustable such that a projection, in a vertical plane, of a direction of the fluid expelled from the primary nozzle defines an angle a with the longitudinal axis, the angle being selectively adjustable between 10 and +45.

2. The propulsion device according claim 1, wherein the fluid collector is pivotable with respect to the supply conduit.

3. The propulsion device according claim 1, wherein the platform comprises a plurality of surface segments coupled to one another to form the upper and lower surfaces.

4. The propulsion device according claim 1, wherein a distance between the primary nozzle and the bow of the platform is selectively adjustable.

5. The propulsion device according claim 1, further comprising two co-planar secondary nozzles coupled to the lower surface of the platform.

6. The propulsion device according claim 5, wherein secondary nozzles define an angle between each other that is between 60 and 120.

7. The propulsion device according claim 5, wherein the primary nozzle and the secondary nozzles constitute a single fluid manifold.

8. The propulsion device according claim 5, wherein fluid flow through each of the secondary nozzles is selectively adjustable.

9. The propulsion device according claim 8, wherein fluid flow through each of the secondary nozzles is selectively adjustable through operation of at least one of an electrical, hydraulic or pneumatic actuator.

10. The propulsion device according claim 1, wherein the angle is selectively adjustable through operation of at least one of an electrical, hydraulic or pneumatic actuator.

11. The propulsion device according claim 1, further comprising a directional fluid outlet movably coupled to the primary nozzle.

12. The propulsion device according claim 11, wherein the directional fluid outlet is selectively adjustable through operation of at least one of an electrical, hydraulic or pneumatic actuator.

13. The propulsion device according claim 1, further comprising a directional flap coupled to the primary nozzle.

14. The propulsion device according claim 1, wherein the directional flap is movable about the primary nozzle.

15. The propulsion device according claim 1, further comprising bindings configured to secure a passenger's feet to the upper surface of the platform.

16. The propulsion device according claim 1, further comprising a remote compression station supplying pressurized fluid to the flexible supply conduit.

17. The propulsion device according claim 16, wherein the remote compression station includes a motorized water vehicle.

18. The propulsion device according claim 1, configured to automatically adjust the angle based on an inclination of the propulsion device and input by an onboard calculator.

19. A propulsion device, comprising: a platform defining an upper surface, a lower surface, a bow, and a stern, wherein the platform defines a longitudinal axis extending from the bow to the stern; a fluid collector coupled to the lower surface of the platform such that at least a portion of the fluid collector extends below the upper surface of the platform, the fluid collector being positioned at the stern of the platform and facing in a bow-to-stern direction such that fluid enters the fluid collector in a stern-to-bow direction; a flexible fluid supply conduit coupled to the fluid collector for providing pressurized fluid to the collector; and a primary nozzle in fluid communication with the fluid collector and configured to expel a fluid towards the stern, wherein a projection, in a vertical plane, of a direction of the fluid expelled from the primary nozzle defines an angle with the longitudinal axis, the angle being between 10 and +45 .

20. The propulsion device according claim 19, wherein the fluid collector and the primary nozzle intersect a common vertical plane extending along the longitudinal axis of the platform.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) A more complete understanding of the present invention, 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:

(2) FIG. 1, previously described, illustrates an embodiment of a propulsion device known from documents U.S. Pat. Nos. 8,336,805 or 8,608,104;

(3) FIGS. 2a and 2b respectively describe two use configurations of a propulsion device according to the invention;

(4) FIGS. 3a, 3b and 3c show sectional views of a first embodiment of a propulsion device according to the invention;

(5) FIG. 3d illustrates a simplified diagram of the first embodiment of a propulsion device according to the invention;

(6) FIG. 4 describes a second embodiment of a propulsion device according to the invention;

(7) FIG. 5 illustrates a third embodiment of a propulsion device according to the invention;

(8) FIG. 6 describes a three-quarters view of the third embodiment of a propulsion device according to the invention, specifying the notions of longitudinal, transverse, median planes, as well as transverse and longitudinal axes of the platform used in the present document;

(9) FIGS. 7a, 7b, 7c, 8a, 8b and 8c illustrate specific configurations of means for collecting and distributing a fluid and of the primary nozzle of a propulsion device according to the third embodiment of the invention; and

(10) FIG. 9 shows a schematic view of a motorized water vehicle adapted as a remote compression station.

DETAILED DESCRIPTION OF THE INVENTION

(11) According to a first embodiment of a propulsion device 20 according to the invention, described in connection with FIGS. 3a, 3b and 3c, such a device includes a main body in the form of a platform 21, on which a passenger 1 can be positioned. Depending on the size of the platform and the power of the remote compression station, the invention provides that several passengers may optionally be positioned simultaneously on said platform 21. The platform includes a lower surface 21i and an upper surface 21s. The passenger(s) 1 may be located on one or the other of the lower 21i or upper 21s surfaces, depending on the type of sensations they wish to feel or the activity that the passenger(s) 1 wish to engage in: the device and/or the platform will advantageously be qualified as reversible. Furthermore, the platform may advantageously be made from one or several materials having, alone or in combination, a sufficient rigidity to bear the weight of one or more passengers and thus avoid any excessive deformation. Alternatively, or additionally, according to FIG. 6, the device may advantageously include one, or in some cases several, arm(s) 42 or reinforcing bar(s), advantageously cooperating with the platform 21 and preferably secured using any means to the lower surface of said platform 21i. Such a reinforcing arm 42 is sized as follows: the distal end of said arm 42 cooperates with said platform 21 along a zone of the lower surface 21i located in the first third of said surface from the bow; furthermore, the proximal end of said arm cooperates by any means with the stern of the device 20 according to the invention, i.e., the platform 21 and/or the thrust unit. Indeed, the passenger 1 positions his front foot, advantageously but non-limitingly, at a distance of two thirds of the platform 21 from the stern. The presence of such an arm makes it possible to greatly decrease the dimensions of the platform 21, in particular its thickness and its width, since the arm(s) damp the flexion of the platform 21. A component material of said platform 21 may be favored to act on the buoyancy of the device when the latter is submerged. According to the embodiments, the platform can thus have one or several cavities filled with air or a vacuum to improve the buoyancy. Alternatively, it is possible to favor the absence of vacuum or cavity, or even the presence of a counterweight or ballast, advantageously able to be emptied, to facilitate movement below the surface of a fluid. Such emptying may for example make it possible to recover the gliding activity, when a passenger 1 wishes to move on the surface of a fluid. Preferably, the platform 21 can be made in a single and same part, such as, by way of non-limiting examples, a surfboard, bodyboard or wakeboard. However, the platform 21 may advantageously be made up of at least two parts, together forming a single and same entity, to impart a certain flexibility to the device and thus impart greater freedom and originality in terms of the figures or movements.

(12) Alternatively, or additionally, the platform may advantageously have a curve or rocker (not shown in FIGS. 3a to 3d, 4 to 6), said curve being observed along a profile view, starting from the bow of the platform 21 toward the stern, like the boards traditionally used in surfing, bodyboarding or wakeboarding. Different types of rockers exist depending on the desired use of the device 20 according to the invention: a stretched rocker, in other words substantially flat, favors speed and tight turns, while a so-called banana curve, i.e., the curve having a greater curve angle, favors the maneuverability and reaction sharpness of the platform 21. The presence of a curve, in the elongated position, allows a passenger 1 to remain on the platform, in place of adapted maintaining means. Furthermore, it is provided that the curve may be adjustable and/or configurable depending on whether the passenger 1 wishes to favor speed or maneuverability of the device 20 according to the invention. Furthermore, the curve may be reversible, such that the curve plays a role in stabilizing the pitch when the device according to the invention moves in an underwater configuration, i.e., the lower surface of the platform 21 being above the upper surface, said passenger being positioned on said lower surface.

(13) A propulsion device 20, described in connection with FIGS. 2a and 2b, FIGS. 3a, 3b and 3c, or even in alternatives according to FIGS. 4, 5 and 6, includes a thrust unit cooperating with the platform 21.

(14) In the present document, we use the term nozzle to define a profiled channeling element, intended to impose an increase in speed on a fluid flow. We could also use the term tip to characterize such an element. This speed increase of the fluid is primarily due to a difference in section between the inlet and the outlet of the element, the section of the outlet being smaller than that of the inlet.

(15) Such a thrust unit consists of a primary nozzle 22 cooperating with the upper surface 21s or lower surface 21i of the platform 21. Such a primary nozzle 22 performs the propulsion function. According to FIGS. 2 and 2b, 3a, 3b and 3c, the primary nozzle 22 is secured against the lower face 21i of the platform and oriented from the bow, i.e., the front, toward the stern, i.e., the rear, of said platform 21: such an orientation advantageously contributes to the movement substantially parallel to the surface of the fluid above or below which the propulsion device according to the invention moves. Alternatively, as described in connection with FIG. 4, two primary nozzles 22 may be secured on the lower face 21i of the platform, said nozzles all being oriented from the bow toward the stern of the platform 21. Advantageously, when there are two nozzles, the fluid expulsion directions are substantially parallel in order to ensure an optimal and fast movement of a propulsion device 20 according to the invention. It is thus possible to increase the entertaining nature of the use of the device by a passenger. In general, the invention is not limited to the number of primary nozzles located below the lower face 21i of the platform 21. The thrust unit thus includes at least one primary nozzle 22 cooperating with said lower face. Similarly, such a primary nozzle 22 can also cooperate with the upper surface 21s of a platform 21s.

(16) Said primary nozzle 22 is secured to the platform using any means via an embedded link. Such an embedded link means that the primary nozzle 22 is completely attached to the platform 21 and that no relative movement is possible between said primary nozzle 22 and platform 21. According to one preferred alternative, the primary nozzle 22 can be mounted moving relative to the platform 21. To favor the takeoff of the device and subsequently guarantee its movement in a direction substantially parallel to the surface of a fluid, any primary nozzle 22 is oriented from the bow toward the stern of the platform 21 such that such a primary nozzle 22 expels a pressurized fluid from the bow of the platform 21 toward the stern thereof in a direction DE22. Furthermore, the fluid is expelled in a median plane at the platform. In connection with FIG. 6, median, transverse and longitudinal planes are defined, as well as longitudinal and transverse axes. These terms are defined as follows:

(17) median plane PM, any plane normal to the platform 21, which separates the port side from the starboard side of said platform 21, said halves not necessarily being equal;

(18) transverse plane PT, any plane normal to a median plane, which separates the platform 21 into two halves, one including the bow of said platform 21 and the other including the stern of the latter, said halves not necessarily being equal;

(19) longitudinal plane PL, any plane normal to transverse and median planes, said plane separating an upper half from a lower half of the platform 21, said halves not necessarily being equal;

(20) transverse axis AT, any axis belonging both to a transverse plane and longitudinal planes; and

(21) longitudinal axis AL, any axis belonging both to a median plane and a longitudinal plane.

(22) According to FIGS. 3a, 3b, 5 and 6, the outlet direction of the fluid from a primary nozzle 22 is located in a median plane PM, said median plane PM comprising a longitudinal axis AL. The fluid is thus expelled from the primary nozzle 22 with an angle . The angle , described between the fluid expulsion direction DE22 and the longitudinal axis AL, is advantageously comprised between 10 and +45 so as to ensure a rapid optimal movement as close as possible to the fluid surface and to allow total use freedom of the platform. The value of the angle is substantially zero, when the fluid outlet direction is substantially combined with the longitudinal axis AL. Indeed, as previously specified, a propulsion device according to the invention is reversible, i.e., the fluid expulsion direction makes it possible not only to move in the air around the water by advantageously adjusting said angle comprised between 0 and +45, but also beneath the water like a submarine by advantageously adjusting said angle comprised between 10 and 0.

(23) The angle can advantageously be adjusted: this adjustment may depend, as non-limiting examples, on the weight of the passenger, the power of the compression station, or quite simply, as previously specified, the movement that the passenger 1 wishes to perform. The primary nozzle 22 can advantageously be secured on a base (not shown in the figures), the latter having indentations to allow the adjustment of the angle : such an arrangement is comparable to a so-called ratchet mechanism. Alternatively, one or several external flaps, optionally steerable, or a steerable fluid nozzle or outlet, said flaps and elbow advantageously being able to be oriented along a median plane, can also be considered. Such flaps and nozzle will be described more precisely below.

(24) Furthermore, different adjustment routes may be used:

(25) first of all, through the static route, also called manual, before any use of the propulsion device 20, the passenger 1 can manually adjust the angle by moving or orienting the primary nozzle 22, in particular the fluid outlet direction;

(26) next, dynamically, before any use or during the use of the propulsion device 20, the passenger 1 can adjust the angle using control or input interface means, such as, by way of non-limiting example, a wired or wireless remote control that the passenger 1 can hold in his hand or that can be positioned on the platform 21;

(27) lastly, automatically, during the use of the propulsion device 20, the angle can be adjusted directly thanks to the use of one or several inclinometers that measure the pitch of a longitudinal plane PL of the platform 21 and the measurements of which are used by an onboard calculator in the device that determines and controls the appropriate angle depending on the movements made by the passenger 1. A device according to the invention may further, or alternatively, include one or several other sensors to measure, for example, the acceleration of the device and thus allow said calculator to adjust the angle . As a non-limiting example, when the platform 21 is substantially horizontal, the calculator may advantageously determine an angle with a low value to maximize the movement speed of the device. Alternatively, for a non-horizontal pitch, such a calculator may command actuators to increase the angle to be sharper and to slalom more easily. The orientation of the fluid outlet of a primary nozzle 22 can thus be determined, pre-adjusted or adjusted dynamically, humanly or automatically according to the alternative embodiments of a device according to the invention.

(28) Furthermore, according to FIG. 5, the means for adjusting the angle can consist of a directional fluid outlet 22c, in order to orient the expulsion of the fluid. These means for adjusting the angle can advantageously, but non-limitingly, consist of a directional nozzle, adaptable on the fluid outlet of the primary nozzle 22. Such a nozzle may for example be inserted on the fluid outlet of the primary nozzle 22. Preferably, said directional nozzle can be oriented in a median plane PM of the platform 21 relative to a longitudinal axis AL comprised in said median plane PM.

(29) Lastly, it is also possible to adjust the position of the primary nozzle 22 in the median plane PM, along the longitudinal axis AL, by adjusting the distance between said primary nozzle 22 and the bow of the platform 21. Such means for adjusting the distance may, advantageously but non-limitingly, be an adjusting rail positioned securely on the lower face of the platform 21. Said position of the primary nozzle 22 may affect the angle : indeed, the larger the distance is between the primary nozzle and the bow of the platform 21, the larger the angle must be. Indeed, the angle counterbalances the weight of a passenger 1 and the position that he assumes on the platform 1. The positioning of a primary nozzle in light of the bow and/or the angle can be determined dynamically by a calculator onboard a device according to the invention that would use, as previously mentioned, measurements from sensors positioned on the device, to translate an incline of a longitudinal, median or transverse plane and/or acceleration of said device into a control of the actuators to adjust the angle .

(30) Furthermore, the thrust unit of a propulsion device according to the invention may include two secondary nozzles 23a and 23b to facilitate the maneuverability of the device 20, in particular during sequences of figures in tight turns, and consequently to maximize sensations. The two secondary nozzles 23a and 23b fit in a same plane, secant to a longitudinal plane along a transverse axis and normal to any median plane, so as to guarantee, during turns to the left or right, a same gesture for the passenger: one thus seeks to provide a device 20 according to the invention that is intuitive, so that such a device can be used by a large number of different users, irrespective of their levels. Said secondary nozzles 23a and 23b are secured to the platform 21 using any means via an embedding link, i.e., they are completely attached to the platform 21, they do not have any degree of freedom and no relative movement between the platform 21 and the secondary nozzles 23a and 23b is possible. According to one preferred alternative, the primary nozzles 23a and 23b can be mounted movably with respect to the platform 21. They cooperate with the lower face 21i in a plane PS secant to a longitudinal plane of the platform 21 along a transverse axis. As a reminder, transverse axis refers to any axis belonging both to a transverse plane PT and a longitudinal plane PL.

(31) According to FIG. 3d, said FIG. 3d illustrating a simplified diagram describing a transverse axis AT of the platform 20 in a plane PS of the secondary nozzles 23a and 23b, said transverse axis corresponds to the axis AT. The normals of the plane PS and a longitudinal plane PL form an angle comprised between 0 and 90, i.e., said secondary nozzles 23a and 23b can be oriented, like the primary nozzle 22, substantially from the bow toward the stern. When the angle between the normals is substantially equal to 0, the fluid outlets of said secondary nozzles are oriented parallel to the longitudinal plane PL. Conversely, when the angle between the normals is substantially equal to 90, the fluid outlets of the secondary nozzles are oriented in a transverse plane PT. Preferably, the angle formed between the two normals of the planes PS and PL can be comprised between 45 and 90, to optimize the function of the secondary nozzles, i.e., to perform a guide role for the displacements and movements of the device 20 during tight turns by a passenger 1.

(32) Furthermore, as specified in connection with FIG. 3d, said respective fluid outlets of the secondary nozzles are symmetrical relative to a median plane, the directions of said fluid outlets being mutually secant with said median plane PM. Said respective fluid outlet directions DE23a and DE23b of the secondary nozzles 23a and 23b describe a predetermined angle . Preferably, such an angle is comprised between 60 and 120. These values are advantageously chosen to guarantee the lift of the device 20 according to the invention in turns, and thus optimal movements. Consequently, the complementary angles .sub.1 and .sub.2 in light of the transverse axis AT are preferably equal, their values depending on the movements or figures performed. For B equal to 120, .sub.1 and .sub.2 are equal to 30. The invention provides, however, that the values of .sub.1 and .sub.2 can be different. The nozzles 23a and 23b then remain coplanar, but their respective fluid outlet directions DE23a and DE23b do not have any symmetry. Similarly, to a primary nozzle, the relative angles or .sub.1 and .sub.2, described by the secondary nozzles 23a and 23b, can be adjusted by different routes such as, for example but non-limitingly, static, dynamic or automatic routes.

(33) Alternatively, or additionally, as illustrated in connection with FIGS. 3a, 3b and 3c, a primary nozzle 22 and two secondary nozzles 23a and 23b can constitute a single and same entity in the form of a composite fluid outlet. Such an arrangement not only makes it possible to optimize the manufacturing time and costs, but also to control mutual adjustments of the different fluid outlets of the respective nozzles very precisely. When such a configuration is favored and said composite fluid outlet is positioned at the center of the lower face 21i of the platform 21, the angle is preferably comprised between +5 and +10.

(34) Lastly, the device 20 according to the invention may also include closing off means, not shown in FIGS. 3a to 3d, for closing off the fluid outlet of the secondary nozzles 23a and 23b independently. Such means make it possible to deliver the majority of the thrust force at the primary nozzle(s) 22 to the detriment of the secondary nozzles 23a and 23b and thus to favor the takeoff of a device 20 according to the invention, or to allow faster movements in a straight line. They can, as non-limiting examples, assume the form of flaps, stoppers or valves. Like the means for adjusting the angles , of the primary 22 or secondary 23a and 23b nozzles, the closing off means can be implemented in different ways: manually or statically before any use of the device 20, dynamically using a input interface such as a remote control before or after the use of the device 20, or automaticallyvia a closing off controls generated by a calculator onboard the propulsion deviceduring the use of the device 20 thanks to measurements delivered by incline or accelerator sensors of the platform 21, said closing off controls being delivered by a wired or contactless route to close off actuators such as flaps, valves for example. Advantageously, the adjusting means and the closing off means can be implemented similarly, as a non-limiting example, using a shared remote control and/or a shared calculator.

(35) The platform, thrust unit and passenger(s) assembly has a center of gravity CG. Unlike certain propulsion devices known from the prior art, for which the nozzles of the thrust unit must be positioned above said center of gravity CG to minimize the physical effort from the passenger and simplify the movements thereof, the primary and secondary nozzles of the thrust unit of the device 20 according to the invention are positioned below said center of gravity CG. The agility of the passenger and his physical comfort thus maximize the procured sensations and allow all movements, all trajectories and all acrobatic figures, whether intentional or occurring by chance.

(36) In order to deliver a sufficient thrust force and allow takeoff, then movement, the device 20 further includes means for collecting and distributing a pressurized fluid, for example water, to the primary 22 and secondary 23a and 23b nozzles. Such a fluid is preferably and previously conveyed using a flexible supply conduit 2 from a remote compression station (not shown in FIGS. 1 to 8c). Such a supply conduit 2 can be made from a material constituting a fire hose, for example leather, or any other materials having the necessary resistance to the pressure exerted by the pressurized fluid. Such a supply conduit 2 must have an appropriate diameter, such as, by means of non-limiting example, a conduit whose diameter in section is substantially equal to 110 mm. Nevertheless, a larger diameter may also be used, the device not being designed to move at a significant height relative to the surface of the fluid, the weight of the conduit not being critical, unlike with the supply of a device according to FIG. 1. An excessively small diameter would create significant pressure losses in light of the compression capacity of the remote compression station: thus, for a given compression capacity, the propulsion would no longer be adequate to guarantee the takeoff and movements of the device 20 according to the invention.

(37) Such means for collecting and distributing a fluid can advantageously include a collector 24. Such a collector 24 can thus have a base 24c to which an end-piece 2a of a supply conduit 2 is attached, for example using a spline adapted to receive said conduit 2, optionally detachable by indexing. The diameter of said base 24c will be adapted to the diameter of the end-piece 2a of the supply conduit 2. According to FIGS. 3a, 4 to 6, the collector 24 can cooperate with the platform 21 via an embedding link: as a result, the collector 24 is rigidly secured and is attached to the platform in order to avoid any relative movement between the platform 21 and the collector 24 and, consequently, to benefit from the camber induced by the pressurized fluid to favor the lift of a device according to the invention and/or to compensate with the weight of a passenger 1. As illustrated in connection with FIGS. 2a and 2b, the invention provides that the end-piece 2a of the supply conduit 2 can advantageously cooperate with the base 24c of the collector 24 via a pivot link to allow a free rotation r2 around an axis C substantially parallel to the conduit 2. The device 20 can thus freely pivot around the axis C without creating loops or excessive stresses on the supply conduit 2. Thus, such rotation makes it possible not only to untangle the supply conduit 2 quickly, i.e., in the space of several seconds or several minutes, but also to facilitate the rotational movements of a device 20 according to the invention.

(38) According to FIG. 3a, the collector 24 can have a shape close to a ? to collect, from the base 24c, and distribute via a bent arm 24a, the pressurized fluid to the primary nozzle 22, respectively. The collector 24 is rigidly connected to the primary nozzle 22. According to a second embodiment described in connection with FIG. 4, when the device according to the invention includes two primary nozzles, the collector 24 can have a shape close to a Y in order to collect, from the base 24c, and distribute via the bent arms 24a, the pressurized fluid to the primary nozzle 22, respectively. An arm 24a thus includes a portion comprising a potential connecting elbow 25 in order to orient the primary nozzles 22 from the bow toward the stern of the propulsion device. It is possible to consider other configurations of the collector 24, said configurations depending on the number of primary nozzles of the propulsion device 20 according to the invention. Furthermore, FIG. 5 has a third embodiment of the means for collecting and distributing a fluid from a propulsion device 20 according to the invention. Such means for collecting and distributing a fluid can advantageously include a collector 24 and be positioned essentially at the stern of the platform 21. Such a collector 24 can advantageously have a shape substantially close to a U in order to collect, from a base 24c, and distribute via a connecting elbow 27, advantageously with a curve radius in a median plane of the platform 21, the pressurized fluid to the primary nozzle. Such a connecting elbow 27 can advantageously assume the form of a C and makes it possible, thanks to its clever arrangement, to decrease the pressure losses within the means for collecting and distributing the fluid while reducing the speed of the fluid before said fluid enters the primary nozzle 22. This decrease in pressure losses itself guarantees, for a given power of the compression station, a boosting of the performance achieved by such a propulsion device 20.

(39) Furthermore, a primary nozzle 22 generally has a substantially circular section. However, as illustrated in connection with FIGS. 6, 7a to 7c and 8a to 8c, in addition to the oblong section of the elbow, the section of the primary nozzle 22 can also be substantially oval or elliptical. Said section of the nozzle is preferably substantially oblong. The term oblong designates a shape that is longer than it is wide and the corners of which are rounded, as illustrated in connection with FIGS. 7a to 7c and 8a to 8c. This configuration in particular makes it possible, for same compression station power, for the pressure losses within a propulsion device according to the invention to be decreased and for the performance of a propulsion device including a substantially oblong primary nozzle section 22 to be boosted. Furthermore, the oblong section makes it possible to avoid friction between the expulsion of the fluid and the lower surface 21i of the platform.

(40) Alternatively, said connecting elbow 27, a portion of or even the entire collector 24, can advantageously include an oblong section, as illustrated in connection with FIGS. 6, 7a to 7c and 8a to 8c. Such an oblong section makes it possible to increase the performance of the device by allowing a tighter curve of the connecting elbow 27, and consequently, by decreasing the pressure losses in the collector and thus maximizing the performance. Furthermore, other advantages should be noted due to the presence of such an oblong section:

(41) the bulk resulting from the collecting and distributing means is greatly decreased, making it possible to greatly decrease the width of the platform 21 and making the device 20 according to the invention more compact;

(42) the impact of the device on the fluid above which the device moves is damped due to the small bulk as opposed to a substantially circular section, thus the gliding of the device is improved during the landing of such a device;

(43) due to the decreased bulk, the distance between the platform 21 and the fluid outlet is decreased, facilitating the control of the incline of the platform 21 via the feet of the passenger 1 or more generally improving the ergonomics and intuitiveness of the device 20 according to the invention.

(44) Additionally, according to FIGS. 5 and 7c, said connecting elbow 27 can include a directional blade 29 that also enables a decrease in pressure losses and boosted performance. Such a directional blade 29 may consist of a paddle, the profile of the blade reproducing the advantageous shape of the connecting elbow 27. It thus includes a curve radius concentric to that of the connecting elbow 27. It can advantageously be positioned over the entire length of the connecting elbow 27, at a distance from the wall describing the inner curve of said elbow corresponding to one third of the height of the oblong section of said elbow 27: the blade makes it possible to steer the flow of molecules of the fluid during their passage in the directional elbow and to avoid slowing of the flow caused by the impact of the fluid molecules. The performance of the propulsion device is thus increased and the pressure losses are ultimately decreased.

(45) Additionally, in order to best direct the expulsion of the fluid, decrease the pressure losses and thus boost the performance of a device 20 according to the invention, a primary nozzle 22, including an oblong section at the fluid outlet, can advantageously comprise one or several directional flaps 41. Such configurations are illustrated in connection with FIGS. 7a to 7c and 8a to 8c: the fluid outlet of the primary nozzle 22 is oblong, as a result of which such an outlet includes two substantially rectilinear and parallel segments. The flaps 41 cooperate with said segments, i.e., they are secured using any means. The presence of one or several directional flaps 41 makes it possible to increase the speed and makes it possible to perform tight turns optimally. To that end, advantageously, the position and/or angle of the flaps 41 can be adjusted beforehand, the flaps 41 thus remaining static during the use of the device 20 according to the invention. Alternatively, the position and/or angle , described by a normal to the flap and by the fluid outlet direction in a median plane PM of the platform, of the directional flaps 41 can be adjusted dynamically or automatically, like the adjustment of the angle for the primary nozzle 22:

(46) dynamically, before any use or during the use of the propulsion device 20, the passenger 1 can adjust the position and/or the angle using input and control means, as a non-limiting example, such as a remote control, in wired or wireless contact with an onboard calculator the propulsion device;

(47) automatically, during the use of the propulsion device 20, the position and/or the angle being able to be adjusted directly thanks to the use of one or several inclinometers, cooperating with the calculator, the latter determining the appropriate position and/or angle based on the movements made by the passenger 1 or the acceleration of the device 20 according to the invention.

(48) Thus, the angle makes it possible to adjust the angle of the fluid direction, guided by the nozzle 22. In such configurations, the directional flaps 41 will be considered articulated. The control means for the different angles , and and positions of the nozzles with respect to the bow can advantageously consist of a single and same entity, i.e., a calculator, to simplify the implementation of the device 20 and to ensure optimal comfort for the passenger 1. The actuation of a directional flap, the orientation and positioning with respect to the bow of a fluid outlet can be done by actuators controlled electrically, pneumatically or hydraulically transmitting a control delivered by a calculator in response to an input delivered by a remote control and/or a measurement from sensors of the device. Furthermore, preferably, at least one directional flap 41 will be present on the fluid outlet of a primary nozzle 22: such a directional flap 41 is advantageously positioned several millimeters past the inner walls of the primary nozzle 22 to avoid any contact between the fluid outlet and said flap, said contact being able to substantially modify the fluid expulsion direction. However, both directional flaps 41 can be present. As previously described, the two flaps are advantageously positioned several millimeters past the inner wall of the primary nozzle 22 in order to avoid any contact between the fluid outlet and said flap. Due to the presence of two flaps, different arrangements are also possible in this configuration:

(49) only one of the two flaps 41 can be articulated, the other flap for example being able to be molded with the fluid outlet according to a predetermined orientation;

(50) both flaps can be articulated: according to FIGS. 7a to 7c, so as not to block the expulsion of the fluid by the primary nozzle, both flaps 41 can advantageously cooperate with one another using fastening and/or attaching means. Such means guarantee that the angle described between the flaps 41 is substantially equivalent or equal to the natural angle described by the expelled fluid. Such an arrangement makes it possible to eliminate any pressure loss.

(51) Surprisingly, the nozzle with oblong section-directional flap(s) assembly is adaptable to any type of motorized water vehicle. Such an assembly can advantageously replace a fluid outlet provided with a directional nozzle. In such a configuration, the oblong section 10, advantageously but non-limitingly, can be in the vertical position. Thus, a fluid outlet with an oblong section, provided with two directional flaps 41 mutually steerable in a median plane, can equip any turbining motorized water vehicle. The power and maneuverability of the latter will be heightened as a result. The pressure losses are practically zero.

(52) The invention further considers that the propulsion device 20 according to the invention includes a fairing 43 cooperating with the platform 21. As illustrated in connection with FIG. 3b, such a fairing 43 can consist of the form of an outer coating and can have different functions based on its position relative to the platform 21. Alternatively, the fairing 43 and the platform 21 can be molded together in a single piece.

(53) The fairing 43 can cooperate with the lower face of the platform 21: this advantageous configuration makes it possible to protect the thrust unit and part of the means for collecting and distributing the pressurized fluid of a device 20 according to the invention, but also to optimize the gliding of such a device on the surface of a fluid. Furthermore, such a fairing may:

(54) allow joint holding of all of the components of a propulsion device 20 according to the invention;

(55) provide an aesthetic side to the assembly;

(56) contain one or several safety features: the fairing 43 can house a safety device, including but not limited to an airbag, so that when a fall occurs on a solid surface, the landing of a passenger 1 can be less difficult and/or violent;

(57) include buoyancy means such as, by way of non-limiting example, an inflatable buoy, to avoid drowning upon any fall into a fluid such as water.

(58) A fairing 43 can be secured rigidly to said lower face 21i and houses at least the thrust unit. However, the fairing may advantageously house the collector 24 in addition to primary or even secondary nozzles. According to these different alternatives, the fairing advantageously includes openings for allowing the fluid outlets of the nozzles to emerge and expel the fluid. Preferably, such a fairing may be substantially V-shaped, this shape being suitable for allowing the damping of shocks with the fluid that may be in contact with the propulsion device 20 according to the invention. Such a general V-shape allows an increase in the penetration of the propulsion device 20 into said fluid. As a non-limiting example, when the device 20 according to the invention includes two primary nozzles, a fairing 43 with an appropriate shape may advantageously correspond to a fairing including two V-shaped hulls parallel to one another, such as, by way of non-limiting example, the hulls of a catamaran.

(59) Alternatively, or additionally, the fairing may cooperate with the upper surface of the platform, advantageously but non-limitingly, the bow of the platform 21. Such an arrangement is particularly advantageous when the passenger 1 is in the elongated position, as shown in FIG. 2b. Indeed, the fairing, during such a configuration, performs a deflector function, i.e., it modifies the flow of the air and/or the fluid on the surface of which a passenger 1 moves and thus ensures the comfort of the passenger 1.

(60) The invention also provides that the platform 21 can have means for ensuring the maintenance 28 of a passenger on the platform 21 comfortably, in complete safety. A passenger 1 may assume different positions on the platform 21 based on the sensations that that passenger 1 wishes to have. The possible positions in particular include:

(61) an upright position, similar to a position that may be assumed by a surfer on a surfboard, illustrated in connection with FIG. 2a;

(62) an elongated position, similar to a position that may be assumed by a rider on a bodyboard, illustrated in connection with FIG. 2b;

(63) a segway position, close to that which a passenger may assume on a self-balancing personal transporter;

(64) a substantially seated position, allowing the submarine configuration.

(65) Thus, depending on the preferred position of a passenger 1 on the platform 21 of a device according to the invention, as a non-limiting example in the upright position, said maintaining means 28 may consistas indicated in FIG. 1of a pair of foot straps, slippers or fastening boots of a similar type to what can for example be found in wakeboarding.

(66) Alternatively, other types of maintaining means 28 may be preferred when one wishes to help the passenger maintain an elongated position. Such means 28 may include gripping means such as, but not limited to, one or several tubes (not shown in FIGS. 2a, 2b, 3a to 3d and 4 to 6) serving as handles. Such tubes can be positioned in different locations on the upper surface 21s of the platform or at the front of the platform 21. Additionally, the tube(s) may advantageously be hollow so as to contain input or control means, independent or shared, within them in order to:

(67) control the fluid compression power of a remote compression station delivering the pressurized fluid;

(68) adjust the different angles relative to the primary and secondary nozzles;

(69) adjust the distance between the primary nozzle(s) and the bow of the platform.

(70) Alternatively, the gripping means maybe cylindrical, having an outer diameter arranged to insert control means including a body having an appropriate female groove or hole.

(71) Advantageously, said input and/or control means can also cooperate with the tube(s) while being, as a non-limiting example, secured to said tubes using any means. Such input and/or control means can advantageously consist of the form of a remote control delivering inputs via one or several wired or contactless communications with actuators, a calculator or even the remote fluid compression station.

(72) To that end, irrespective of the configuration or alternative embodiment of a propulsion device according to the invention, the latter advantageously includes safety means to protect the integrity of the passenger in case of fault or failure by the latter, as well as to avoid any uncontrolled movement of the propulsion system including said propulsion device, the pressurized fluid supply conduit and the remote compression station. Such safety means can be partially integrated into a remote control held by the passenger to control the power of the compression station or to adjust certain elements of the devices dynamically, such as the flaps, valves, positioning actuators for the nozzles, etc. Such safety means can also be separated from said remote control. In all cases, said safety means can in particular implement two modes for generating safety inputs, voluntary or by default, controlling the stopping of the compression motor of the compression station, said stopping optionally being preceded by a gradual decrease of the compression power during a predetermined period, generally several seconds. This stopping input may be conveyed by a cable or more generally by a wired connection connecting the safety means to the compression motor, or to control means of the latter onboard the remote compression station. Such an input can also be transmitted by wireless communication, for example radio or acoustic, established between the safety means and said remote compression station. The input can, alternatively, be conveyed by wired or wireless communication to a calculator onboard the propulsion device, advantageously that interpreting all of the inputs of the passenger so as, for example, to steer or adjust a nozzle of the device. This calculator is responsible for interpreting this safety input by controlling stopping of the compression station strictly speaking, said stop control being transmitted in turn by the calculator to the compression station by wired or wireless means. Irrespective of the selected solution to connect the safety means to the compression station, directly or indirectly via the calculator, said safety means can advantageously include a man-machine interface, for example a button or trigger of a remote control, which, when actuated by the passenger, generates the safety inputs whereof the interpretation by the compression station or the calculator of the device causes the stopping of said remote compression station, said stopping advantageously being gradual. Alternatively, or additionally, such an input may be generated by the release by the passenger of an action on a man-machine interface, for example a button or trigger. As one preferred example, if such an interface is no longer biased by the passenger during a predetermined period, advantageously several seconds, the safety input is generated by the safety means. Such a solution makes it possible to detect a failure or uneasiness of the passenger. Alternatively, or additionally, the safety means can consist of a transmission of a continuous signal, the breaking of which may be interpreted by the calculator as a safety input. This alternative may be particularly interesting when the safety means communicate with said calculator via a wireless link. The transmission of said signal by the safety means can be provided to ensure a nearby communication, approximately one to two meters, for example, with the calculator. Thus, a fall by the passenger, the latter moving away, jointly with the safety means, for example his wireless remote control, from the safety device beyond a safety distance, corresponding to the maximum transmission range of the signal, no longer makes it possible for the signal to be conveyed from the safety means to the calculator. The latter then interprets this break in the communication as a safety input. Furthermore, such a signal may be conveyed by a cable connecting the safety means to the calculator by an attachment arranged to give way when the passenger falls. The signal is then no longer transmitted to the calculator. Also alternatively, said cable may be a conventional cutout switch, keeping a terminal of the calculator at a reference potential as long as said cable is connected to said calculator. The detachment of the cable when a fall occurs causes a variation in the potential of said terminal, said variation being interpreted by the latter as a safety input. All other configurations or arrangements of such safety means may be considered. Such safety means associated with a calculator onboard a propulsion device according to the invention, or in communication with control means for the compression motor of the remote compression station, could be adapted to equip any other device for propelling a passenger, as long as said device is supplied with pressurized fluid by a remote compression station. Furthermore, any other input from the passenger, for example via a remote control, seeking to regulate the compression power of the motor of the remote compression station, can be conveyed from an appropriate man-machine interface of said remote control, for example a trigger or lever, to said station directly or via the calculator of the propulsion device using a wired connection or wireless connection. Such a connection can be mixed, i.e., wired between the remote control and the calculator, wireless between the calculator and the compression station, or vice versa.

(73) Alternatively, or additionally, according to FIG. 2b , when a passenger 1 wishes to retain an elongated position, a device according to the invention can include gripping means advantageously assuming the form of a sleeve 28 or handlebars, placed at the bow of the platform 21, as illustrated in connection with FIG. 2b Such a sleeve 28 is similar to the handlebars present on bicycles or scooters. It not only allows the passenger 1 to maintain himself on the platform 21 in a chosen position, but also to direct the movement of the device 20 according to the invention, depending on whether the passenger 1 is moving in the air, on the surface of water or beneath the water. Such a sleeve 28 is preferably used to guarantee more optimal maneuverability. Like the tubes previously described, the sleeve 28 can advantageously be hollow and contain, or more generally cooperate with, control means, such as, by way of non-limiting example, a wired or wireless remote control. Furthermore, such a sleeve 28 can be removable, i.e., it can be moved, taken off, detached or directly inserted within the fairing of the device 20 according to the invention. Such an arrangement makes it possible to reduce the bulk of the device 20, which assumes the form of an all-in-one adaptable device that is very easy to manipulate.

(74) Alternatively, the maintaining means can include seating means: the upper surface 21s can be arranged so as to receive a passenger 1 in the seated position. Such seating means can, advantageously but non-limitingly, consist of a saddle, a bump or a hollow to receive the buttocks of said passenger 1 and allow him to move in the seated position, calmly, comfortably and safely.

(75) Furthermore, the maintaining means can advantageously be arranged so the passenger can place himself along the platform, for example in the segway position as previously described. The maintaining means can also comprise bearing means for the feet, as a non-limiting example, according to FIG. 3a , foot wedges 28. Advantageously, like the sleeve 28 , the foot wedges 28 can be removable, telescoping, i.e., the different parts that make up the foot wedges nest and slide in one another, or retractable, i.e., the fairing of the device 20 according to the invention includes appropriate housings to conceal said foot wedges.

(76) Lastly, as previously specified, the propulsion device 20 according to the invention is reversible for use as a submarine. The primary nozzle 22 and/or the reinforcing arm 42 can advantageously include a coating made from an appropriate material, such as a foam, so as to create seating means, for example a seat, so that a passenger 1 can position himself on said device 20.

(77) A propulsion device according to the invention, for example like the device 20 described as an example in connection with FIGS. 2a, 2b, 3a, 3b, 3c, 4, 5 and/or 6, can be supplied by any remote fluid compression station as long as the latter is able to deliver a fluid having a sufficient pressure for the operation of the propulsion device. The latter can be dedicated to that use, at the risk of increasing the overall cost of a propulsion system including a propulsion device according to the invention, a remote compression station and a supply conduit cooperating with said device and station to convey the pressurized fluid.

(78) In order to decrease such a cost, the invention also provides that the remote compression station can be an apparatus whose original primary function is different from supplying a pressurized fluid for a propulsion device. As an example, the invention provides that a land or water firefighting vehicle can be operated as a remote compression station if it has a sufficient fluid compression capacity.

(79) Alternatively, or additionally, the invention further proposes taking advantage of the natural compression capacity of a fluid of a motorized water vehicle (MWV), such as the RUNABOUT MZR, 2011 edition by the builder ZAPATA RACING. Such a vehicle 30, a side view of which is described in connection with FIG. 9, includes a hull 31 and houses propulsion means 32 compressing a fluid by turbining, on the surface of which fluid the MWV is navigating, said fluid being ingested from an inlet 33 arranged below the hull 31. Said fluid thus pressurized is expelled from a fluid outlet 34 situated at the rear of the vehicle. Such a fluid outlet generally consists of a nozzle cooperating with a directional (not shown in FIG. 9) to modify the trajectory of the MWV. The means 32 are generally driven using a heat engine, also not shown in FIG. 9. In order to guarantee the use of the MWV as a remote compression station, a flange 35 is applied on the fluid outlet 34, then connected to an end-piece 2b of a supply conduit 2 in order to convey the pressurized fluid expelled from the fluid outlet of the MWV. The supply conduit 2 is connected, at the other end, using an end-piece 2a, to the means 24 for collecting and distributing the pressurized fluid to the nozzles of a propulsion device according to the invention like the device 20 described in connection with FIGS. 2a, 2b, 3a, 3b, 3c, 4, 5 and 6.

(80) The invention has been described during its implementation on the surface of and/or in the water. It may also be implemented on the surface of any suitable fluid, and more particularly in the air.

(81) It will be appreciated by persons skilled in the art that the present invention 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 invention 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 invention. A variety of modifications and variations are possible in light of the above teachings without departing from the scope and spirit of the invention, which is limited only by the following claims.