A paddle-type propulsion system incorporating directional guidance, designed for a paddleboard-type watercraft.

Abstract

The invention relates to a paddle propulsion system (Sys) (3) incorporating directional guidance for a paddleboard-type watercraft (1). The system (Sys) includes a lever (2) connected to the paddleboard structure (1). The lever (2) is composed of a first oscillating part (2') and a second rotating part (2''), constituting a rudder bar (2'') connected to a fin (8) located in the plane of oscillation (Po) of the lever (2). The axis of oscillation (Y-Y') of the lever (2) is located under the hull (113) of the paddleboard (1), at a connection zone (Zl) linking the oscillating part (2') to the blade (3). The rudder fin (8) is located under the blade (3), which is itself located between the rudder fin (8) and the hull (113) of the paddleboard (1). Figure to be published with the abbreviation: [Fig. 8]

Description

Title of the invention: A paddle propulsion system incorporating a heading guidance system and intended for a paddleboard-type aquatic vehicle

[0001] The present invention relates to a propulsion and steering system for a paddle-type water vehicle propelled by means of a paddle, on which a user stands and propels the paddle by the action of muscular force exerted by means of his hands on a gripping member connected to a lever, itself connected to the blade.

[0002] Particularly in this area, US patent 2019308709 illustrates, in Figure 32 of the patent, a paddle-type vehicle in which a mechanism is composed of a lever, a sleeve (located opposite reference numeral 3138 at the bottom of the illustration), and a blade 3139. The sleeve surrounds the lever, and a hole is made in the paddle to form a housing into which the sleeve is inserted. This configuration results in an oscillation of the blade 3139, an oscillation shown between 3140 and 3141. According to this document, the blade 3139 provides both propulsion for the paddle and the steering means 3139, enabling the paddle to change its direction (the oscillation of the blade being oriented for this purpose in the directions 3142 and 3138). The oscillation axis of the blade 3139 is located in the thickness of the paddle (in the middle of the arc of the double arrow 3138).

[0003] For its part, patent WO2017179888 describes (with reference to Figures 1 and 2 of the document) a mechanism formed by a lever 140-121, the upper part of which constitutes a gripping member, this lever 140-121 being connected at its lower part to a blade 130. In this case, the blade 130 exclusively provides propulsion for the paddle 100. The oscillation axis 122c of the blade 130 is located within the thickness of the paddle 100. Furthermore, the heading steering means for the paddle 100 consists of the elements 111-112-114-113, separate from the lever 140-121 and located at the rear of the paddle 100.

[0004] According to these two cited documents, the positioning of the oscillation axis of the blade in the thickness of the paddle induces a kinematic acting as a propulsion damper considerably detrimental to the efficiency of said propulsion, as will be explained later.

[0005] Compared to this prior art, the present invention proposes a propulsion system in which the oscillation axis of the lever and the blade is specifically arranged so as to efficiently recover all of the thrust force of the blade, the lever also integrating a steering guidance in heading of the paddle adapted to the particular position of the oscillation axis.

[0006] To this end, according to the invention, the paddle propulsion system incorporates a heading guidance system and is intended for a paddleboard-type watercraft on which a user stands and propels the paddleboard by the action of muscular force exerted via their hands at one end of a lever,

[0007] - the lever is composed of a first oscillating part which is articulated along an oscillation axis connected to the paddle structure and positioned perpendicularly to the paddle's longitudinal axis, the oscillation of this oscillating part occurring in a plane of oscillation perpendicular to the paddle's waterline, - the lever also comprises a second rotating part which fits into a bearing integrated into the oscillating part, this rotating part constituting a steering bar articulated in rotation within this bearing along a steering axis located in the plane of oscillation, - the lever passes inside a well through the thickness of the paddle, - at one end, the lever is attached to a gripping element located above the paddle deck and composed of two parts arranged opposite each other, on either side of this first end, - the two parts of the gripping element jointly receive the muscular force exerted through the user's hands,This force causes the lever to oscillate; at a second end, the lever is attached, under the paddleboard's hull, to a blade whose oscillation depends on the lever's oscillation; the blade in question possesses the propulsive characteristics of a fin, that is, a blade applying, on its inertial support of rotation, due to its oscillation and the pressure it consequently exerts on the water, a thrust force on said inertial support.

[0008] According to the configurations specific to the invention: - towards the second end of the lever, the axis of oscillation of the lever is located under the hull of the paddle, at a connection point linking the oscillating part to the blade, - one end of the rudder bar is connected, by a rigid mechanical link, to the gripping member, while a second end of the rudder bar is connected, also by a rigid mechanical link, to a rudder fin located under the waterline of the paddle, the assembly formed by the rudder bar, the gripping member and the rudder fin constituting a rudder, - the average plane of the rudder fin is perpendicular to the waterline of the paddle, - the rudder fin is located under the blade, which is itself located between the rudder fin and the paddle hull.

[0009] According to additional configurations of the invention:

[0010] - the lever comes to rest against a stop, this support corresponding to a position of the blade offering less resistance to water penetration,

[0011] - the lever includes a fixing element for one end of a tension spring one end of which is connected to a fixed point attached to the paddleboard's structure,

[0012] - the tension spring is implemented in the form of an elastic tensioner,

[0013] - the oscillating part comprises a plate-shaped area whose thickness is perpendicular to the plane of oscillation,

[0014] - the blade is removably attached to the oscillating part by means of two plates attached to the blade and arranged opposite each other above its leading edge, the two plates being tightened by screwing them to the oscillating part, a space being created between the two plates to allow the insertion of the oscillating part between the two plates,

[0015] - viewed in a plane parallel to the plane of oscillation, the control axis is at a distance of the axis of oscillation along a cantilever,

[0016] - the rudder bar is in contact with the inside of the well during the oscillation of the lever,

[0017] - the well has two plate-shaped extensions whose thickness is perpendicular to the plane of oscillation and extending below the waterline to form a yoke providing articulation support for the rotation of the blade, - at the level of the axis of oscillation, between each extension and the oscillating part, is arranged a spacer with a hydrodynamic wing profile.

[0018] With reference to the attached drawings:

[0019] [Fig.1] to [Fig.3] illustrate the prior art and are views located in a plane perpendicular to the waterline of the paddle and parallel to the longitudinal axis of the paddle, with the user's hands holding the gripping device.

[0020] In [Fig.1] the blade offers less resistance to penetration into the water.

[0021] In [Fig.2], the user's hands pull the gripping member towards the rear of the paddle.

[0022] In [Fig.3], the user's hands push the gripping organ forwards. paddle.

[0023] [Fig.4] to [Fig. 14] represent a propulsion and steering system according to the invention.

[0024] [Fig.4] is a perspective view of the system integrated into a paddle.

[0025] [Fig.5] is a cross-sectional view along AA ([Fig.4]) in a plane parallel to the plane of lever oscillation.

[0026] [Fig.6] is a partial cross-sectional view along BB ([Fig.4]) at the level of the oscillation axis, along a plane perpendicular to the oscillation plane of the lever.

[0027] [Fig.7] is a cross-sectional view along AA ([Fig.4]) in a plane parallel to the plane with the lever oscillating, the user's hands holding the gripping device, the blade offering less resistance to penetration into the water.

[0028] [Fig.8] is a view along the same section plane AA, the user's hands pulling the gripping mechanism towards the rear of the paddle.

[0029] [Fig.9] is a view along the same section plane AA, the user's hands pushing the gripping organ towards the front of the paddle.

[0030] [Fig. 10] is a view along the same section plane AA, the blade offering less resistance to penetration into the water, the paddle moving forward on its momentum, the user's hands turning the gripping member to his right in order to orient the paddle.

[0031] [Fig. 11] is a cross-sectional view along CC ([Fig. 10]) at the connection between the rudder bar and the rudder fin.

[0032] [Fig. 12] and [Fig. 13] are views describing the method of attaching the blade to the oscillating part. [Fig. 12] is an exploded perspective view while [Fig. 13] is an assembled perspective view.

[0033] [Fig. 14] is an exploded perspective view of the system.

[0034] With reference to the prior art:

[0035] In [Fig. 1], a user U, standing on a paddle 1, holds with his hands Mu a gripping member 4 connected to a first end 21 of a lever 2. The axis of oscillation Y-Y' of the lever 2 is located in the hull 113 of the paddle 1, inside a well 7. Towards a second end 22, the lever 2 is fixed, under the hull 113 of the paddle 1, to a blade 3 whose oscillation is dependent on the oscillation of the lever 2. The blade 3 is obtained in the form of a flexible fin and is shown in a position offering less resistance to penetration into the water E. A distance D separates the oscillation axis Y-Y' from a linkage zone ZI connecting the lever 2 to the leading edge 31 of the blade 3. Consequently, this distance D creates a lever arm BL.

[0036] In [Fig. 2], the user U pulls the gripping element 4 rearward on the paddle 1 with their hands Mu, exerting a muscular force Fm. This causes the lever 2 to oscillate in the direction Osl and the blade 3 in the direction Os'1. This oscillation Os'1, through elastic deformation of the blade 3, produces a thrust force Fp. However, under the effect of the lever arm BL, the hull 113 of the paddle 1 undergoes a slip G1 opposite to the thrust force Fp. This slip G1 is a consequence of the distance d created by the movement of the lever arm BL, the distance d being measured along the longitudinal axis of the paddle 1. The thrust force Fp therefore does not effectively contribute to the forward movement of the paddle 1. The fulcrum constituted through the axis of oscillation Y-Y' leaks instead of fully reflecting the effect of the thrust force Fp.

[0037] In [Fig. 3], the user U pushes the gripping element 4 forward on the paddle 1 with their hands Mu, exerting a muscular force Fm. This causes the lever 2 to oscillate along the Os2 direction and the blade 3 to oscillate along the Os'2 direction. This oscillation Os'2 also causes a thrust force Fp through elastic deformation of the blade 3. However, the thrust force Fp is significantly absorbed by compensating for the previously created distance d, thus reducing the effect of the thrust force primarily to a slip G1 of the hull 113 of the paddle 1. This slip G1 is in the direction of the thrust force Fp, resulting in a short stroke for the forward movement of the paddle 1. Here again, the fulcrum formed by the axis of oscillation Y-Y' is not fully transmitted instead of fully reflecting the effect of the thrust force Fp.

[0038] Compared to this prior art, the present invention makes it possible to obtain maximum efficiency of the thrust force of the blade for the advancement of the paddle.

[0039] With reference henceforth to the system of the invention:

[0040] According to [Fig. 4] to [Fig. 14], a propulsion and steering system for a paddle 1 includes a lever 2 consisting of a first oscillating part 2' connected by a joint to the structure of the paddle 1.

[0041] Typically, the paddle 1 incorporates in its rear part a fixed stabilizing fin 28 ([Fig.4]).

[0042] According to [Fig.7] to [Fig. 10], a user U stands on the paddle 1 and propels the paddle 1 by the action of the muscular force Fm exerted through his hands Mu at the end of the lever 2.

[0043] The articulation of the lever 2 is achieved by an oscillation axis Y-Y' connected to the structure of the paddle 1 and arranged perpendicularly with respect to the longitudinal axis X-X' of the paddle 1.

[0044] The oscillation in the direction Osl or Os2 of the oscillating part 2' is exclusively in a plane of oscillation Po perpendicular to the flotation plane Pf of the paddle 1 and which passes through the longitudinal axis X-X' of the paddle 1.

[0045] The lever 2 passes through the thickness of the paddle 1 by passing inside a well 7, of elongated configuration, and disposed in the hull 113 along the longitudinal axis X-X' of the paddle 1.

[0046] Towards a first end 21, the lever 2 is integral with a gripping member 4 located above the deck 11 of the paddle 1. The gripping member 4 is composed of two parts 41, 42 arranged opposite each other, on either side of this first end 21

[0047] These two parts 41, 42 of the grasping organ 4 are jointly receivers of the muscular force Fm ([Fig.8] and [Fig.9]) exerted via the hands Mu of the user U. This force Fm causes the oscillation in the direction Osl or Os2 of the lever 2.

[0048] Towards a second end 22, the lever 2 is fixed, under the hull 113 of the paddle 1, to the leading edge 31 of a blade 3 whose oscillation Os' 1, Os'2 is dependent on the oscillation Os1, Os2 of the lever 2.

[0049] Also, towards this second end 22 of the lever 2, the oscillation axis Y-Y' of the lever 2 is located under the hull 113 of the paddle 1, at the level of a connection zone ZI linking the oscillating part 2' to the leading edge 31 of the blade 3.

[0050] The blade 3 possesses the propulsive characteristics of a fin 3, that is to say, a blade 3 applying, on its rotational inertial support 1, due to its oscillation Os'1 or Os'2 and the pressure it consequently exerts on the water E, a thrust force Fp on said inertial support 1 ([Fig. 8] and [Fig. 9]). The fin 3 comprises, as is known, a flexible blade made, for example, of glass or carbon fibers, or even of flexible polypropylene, the thrust force Fp being obtained, under the action of the muscular force Fm, by the pressure of the water E on the curvature of the blade.

[0051] Such propulsive characteristics specific to fins can also be obtained by the use of equivalent devices for the implementation of the invention, such as the articulated fin structures described, for example, by patent FR2931690 or similar devices.

[0052] The lever 2 has a second rotating part 2' ' which fits into a bearing 221 integrated into the oscillating part 2'. This rotating part 2” constitutes a steering bar 2” articulated in rotation Rot ([Fig.4] and [Fig.5]) in the bearing 221 along a steering axis Z-Z' located in the plane of oscillation Po.

[0053] A first end 21 of the rudder bar 2' ' is connected, by a rigid mechanical link, to the gripping member 4, while a second end 22 of the rudder bar 2' ' is connected, also by a rigid mechanical link, to a rudder fin 8 located below the waterline Pf of the paddle 1.

[0054] The assembly formed by the rudder bar 2'', the gripping member 4 and the fin 8-steering rudder thus constitutes a 2”-4-8 rudder.

[0055] The mean plane Pma of the rudder fin 8 is perpendicular to the waterline plane Pf of the paddle 1 ([Fig.4], [Fig.5], [Fig.7] to [Fig.11].

[0056] According to [Fig. 10], the blade 3 is shown in a position offering less resistance to penetration into the water, with the paddle 1 moving forward on its momentum. Using the gripping member 4, the user's hands Mu rotate the rudder bar 2” Rotl clockwise in order to orient the paddle 1. The fin of rudder 8 rotates accordingly at an arbitrary angle 0 ([Fig. 11], thus orienting paddle 1. Furthermore, the rudder fin 8 can also rotate during the oscillation of the blade 3.

[0057] The rudder fin 8 is located under the blade 3, itself located between the rudder fin 8 and the hull 113 of the paddle 1.

[0058] More particularly according to [Fig.5], [Fig.7] and [Fig.10], the rudder bar 2” constituting the lever 2 comes to rest against a stop 9, this support corresponding to a position of the blade 3 offering less resistance to penetration into the water E. This stop 9 is preferably made of rubbery material so as to cushion the contact between the lever 2 and the stop 9.

[0059] In addition to this stop 9, the lever 2 includes a fastening element Of for one end 101 of a tension spring 10, the other end 102 of which is connected to a fastening point 18 integral with the deck 11 of the paddle 1, which forms part of the structure 11 of the paddle 1. The tension spring 10 is in the form of an elastic tensioner 10. The elastic tensioner 10 is removably connected to the lever 2 and has at one of its ends 101 a carabiner 15 that fits inside a ring 14 connected to the lever 2. The other end 102 of the elastic tensioner 10 also has a carabiner 16 providing a removable connection with a bridge 18 fixed to the deck 11 of the paddle 1. The elastic tensioner 10 is under tension Te and forces the lever 2 to bear against the stop 9.

[0060] The oscillating part 2' comprises a plate-shaped area 222 whose thickness e is perpendicular to the plane of oscillation Po ([[Fig. 6]]. The thickness e of the oscillating part 2' is thus optimized to reduce its drag in the water E. Similarly, to reduce drag in the water E, the well 7 comprises two plate-shaped extensions 711, 721 whose thickness e' is also perpendicular to the plane of oscillation Po and which extend below the waterline Pf to form a yoke 711 - 721 providing support for the Y-Y' articulation for the rotation of the blade 3. To effectively guide the oscillating part 2' in the oscillation plane Po at the oscillation axis Y-Y', a spacer 23 is arranged between each extension 711,721 and the oscillating part 2'. To optimize this guidance, the control bar 2” is in contact with the inside 731 of the well 7 during the oscillation of the lever 2. Furthermore, each spacer 23 has a hydrodynamic wing profile to reduce the effect of drag in the water E ([Fig.5], [Fig.7]).

[0061] The oscillation axis Y-Y' is formed by means of a screw 713 which is inserted into holes 712 and 722 made in the yoke 711-721, holes 231 made in the spacers 23, and a hole 223 made in the plate 222 of the oscillating part 2' ([Fig. 14]). The lateral sides 732 of the well 7 have projections 73 which, with their face 731 located inside the well 7, establish contact with the rudder bar 2” during the oscillation of the lever 2 ([Fig.6] and [Fig. 14]). Furthermore, the hydrodynamic wing profile of the strut 23 is held in position by means of the screw 713 and the pin 232 which is inserted inside holes 233 and 224 made respectively in the strut 23 and in the plate 222 of the oscillating part 2' ([Fig.5]).

[0062] Viewed in a plane parallel to the plane of oscillation Po ([Fig. 5]), the rudder axis Z-Z' is distant from the axis of oscillation Y-Y' by means of an overhang Paf. The hole 223 is thus made possible in the plate 222 in order to effectively clamp the plate 222 and the spacers 23 between the extensions 711 and 721 of the clevis 711-721, these elements 222, 23 being held between the head of the screw 713 bearing against the extension 721 and a nut 714 bearing against the extension 711 ([Fig. 14]).

[0063] More particularly according to [Fig. 5], [Fig. 6] and [Fig. 14], the rudder bar 2” is inserted inside the bearing 221 of the oscillating part 2' of the lever 2. This cylindrical rod 211 is connected by a removable mechanical linkage to a tubular part 212 connecting to the gripping member 4, the solid rod 211 penetrating inside the tubular part 212. The rudder bar 2’ extends under the hull 113 of the paddle 1, the rod 211 connecting to the rudder fin 8. In addition, the rudder bar 2” is blocked in translation relative to the oscillating part 2' by two stops 25, integral with the solid rod 211, and which bear against the open ends of the bearing 221 of the oscillating part 2'.

[0064] More particularly according to [Fig. 12] and [Fig. 13], the blade 3 is removably fixed to the oscillating part 2' by means of two plates 3011, 3021 attached to the blade 3 and arranged opposite each other above its leading edge 31. A space 305 is created between the two plates 3011, 3021 in order to allow the insertion of the oscillating part 2' between the plates 3011 and 3021.

[0065] These two plates 3011 and 3021 are tightened by screwing against the oscillating part 2' using screws 26 and nuts 27, the screws 26 passing through holes T1 made in the plates 3011 and 3021 and through holes T3 made in the oscillating part 2'. The two plates 3011 and 3021 each have a perpendicular extension 301 or 302. A plywood plate 303 is positioned under the blade 3 opposite the extensions 301 and 302. A rubber plate 304 is also positioned between the blade 3, the extensions 301 and 302, and the plywood plate 303. The blade 3 is clamped on one side between the extensions 301 and 302 and a rubber plate 304, and on the other side between the plywood plate 303 and another rubber plate 304. This clamping of the blade 3 is achieved by means of screws 261 and nuts 262, the screws 261 passing through holes T2 made in the extensions 301 and 302, the blade 3, the plates rubber 304 and plywood 303, thus creating the ZI connection zone linking the oscillating part 2' to the blade 3.

[0066] According to [Fig. 8], the user U, standing on the paddle 1, pulls the gripping element 4 towards the rear of the paddle 1 with their hands Mu, exerting a muscular force Fm. This causes the lever 2 to oscillate in the direction Osl and the blade 3 to oscillate in the direction Os' 1. The oscillation Os' 1 causes, through elastic deformation of the blade 3, a thrust force Fp. This thrust force Fp is entirely transmitted as a forward force Fa to the inertial support 1, due to the specific positioning of the oscillation axis Y-Y' located under the hull 113 of the paddle 1, at the level of the connection zone ZI linking the oscillating part 2' to the blade 3. The elastic tensioner 10 elongates under the stress of the muscular force Fm, accumulating the minimal energy expended for its elongation.

[0067] According to [Fig. 9], the user U pushes the gripping element 4 forward on the paddle 1 with their hands Mu, exerting a muscular force Fm. This causes the lever 2 to oscillate along the Os2 direction and the blade 3 to oscillate along the Os'2 direction. This oscillation Os'2 also causes a thrust force Fp to occur through elastic deformation of the blade 3. Similarly, due to the specific position of the oscillation axis Y-Y', this thrust force Fp is fully transmitted as a forward force Fa to the inertial support 1. The elastic tensioner 10 relaxes and releases the energy accumulated during its extension.

[0068] The particular positioning of the oscillation axis Y-Y' of the lever 2 recommended by the invention makes it possible to restore an optimal efficiency of the thrust force Fp of the blade 3, like marine animals and swimmers, efficiency obtained by direct effect of a thrust force exerted by a blade on an inertial body to be set in motion.

[0069] The device, which is the subject of the invention, is intended for a paddle-type aquatic vehicle as a paddle propulsion system integrating a heading guidance system.

Claims

Demands

1. - A paddle propulsion system (3) incorporating a heading guidance system for a paddleboard-type watercraft (1) on which a user (U) stands and propels the paddleboard (1) by the action of muscular force (Fm) exerted via their hands (Mu) at one end of a lever (2), and: - the lever (2) is composed of a first oscillating part (2') which is articulated about an axis of oscillation (Y-Y') connected to the structure of the paddleboard (1) and arranged perpendicularly to the longitudinal axis (X-X') of the paddleboard (1), the oscillation of this oscillating part (2') being inscribed in a plane of oscillation (Po) perpendicular to the waterline (Pf) of the paddleboard (1), - the lever (2) is also composed of a second rotating part (2”) which is inserted into a bearing (221) integrated into the part oscillating (2'),This rotating part (2”) constitutes a rudder bar (2”) articulated for rotation (Rot) in this bearing (221) along a rudder axis (Z-Z') located in the plane of oscillation (Po), - the lever (2) passes inside a well (7) through the thickness of the paddle (1), - towards a first end (21), the lever (2) is integral with a gripping member (4) located above the deck (11) of the paddle (1) and composed of two parts (41, 42) arranged opposite each other, on either side of this first end (21), - the two parts (41, 42) of the gripping member (4) jointly receive the muscular force (Fm) exerted via the hands (Mu) of the user (U), this force (Fm) causing an oscillation (Os1, Os2) of the lever (2), - towards a second end (22), the lever (2) is fixed, under the hull (113) of the paddle (1), to a blade (3) whose oscillation (Os' 1, Os'2) is dependent on the oscillation (Os1, Os2) of the lever (2),- the blade (3) considered has the propulsive characteristics of a fin (3), that is to say a blade (3) applying, on its inertial support (1) of rotation, due to its oscillation (Os' 1, Os'2) and the pressure it consequently exerts on the water, a thrust force (Fp) on said inertial support (1), in which:, - towards the second end (22) of the lever (2), the axis of oscillation (Y-Y') of the lever (2) is located under the hull (113) of the paddle (1), at the level of a connection zone (Zl) linking the oscillating part (2') to the blade (3), and: - a first end (21) of the rudder bar (2”) is connected, by a rigid mechanical linkage, to the gripping member (4), while a second end (22) of the rudder bar (2”) is connected, also by a rigid mechanical linkage, to a rudder fin (8) located under the waterline (Pf) of the paddle (1), the assembly formed by the rudder bar (2”), the gripping member (4) and the rudder fin (8) constituting a rudder (2” - 4- 8), - the mean plane (Pma) of the rudder fin (8) is perpendicular to the waterline (Pf) of the paddle (1), - the rudder fin (8) is located under the blade (3), itself located between the rudder fin (8) and the hull (113) of the paddle (1).

2. - System according to claim 1, characterized in that the lever (2) comes to rest against a stop (9), this support corresponding to a position of the blade (3) offering less resistance to penetration into the water (E).

3. - System according to claim 2, characterized in that the lever (2) comprises a fixing member (Of-14) of one end (101) of a tension spring (10) the other end of which (102) is connected to a fixing point (18) integral with the structure (11) of the paddle (1).

4. - System according to claim 3, characterized in that the tension spring (10) is made in the form of an elastic tensioner (10).

5. - System according to claim 1, characterized in that the oscillating part (2') comprises a plate-shaped area (222) whose thickness (e) is perpendicular to the plane of oscillation (Po).

6. - System according to claim 5, characterized in that the blade (3) is removably fixed to the oscillating part (2') by means of two plates (3011, 3021) integral with the blade (3) and arranged opposite each other above its leading edge (31), the two plates (3011, 3021) being tightened by screwing to the oscillating part (2'), a space (305) being created between the two plates (3011, 3021) in order to allow the insertion of the oscillating part (2') between the two plates (3011) and (3021).

7. - System according to claim 1, characterized in that, viewed in a plane parallel to the plane of oscillation (Po), the control axis (X-X') is distant from the axis of oscillation (Y-Y') along a cantilever (Paf).

8. - System according to claim 1, characterized in that the steering bar (2”) is in contact with the inside (731) of the well (7) during the oscillation of the lever (2).

9. - System according to claim 1, characterized in that the well (7) has two plate-shaped extensions (711, 721) whose thickness (e') is perpendicular to the plane of oscillation (Po) and which extend below the waterline (Pf) to form a yoke (711 - 721) forming a support for the articulation (Y-Y') for the rotation of the blade (3).

10. - System according to claim 5 and claim 9, characterized in that at the level of the oscillation axis (Y-Y'), between each extension (711,721) and the oscillating part (2'), is disposed a spacer (23) with hydrodynamic wing profile.

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