EP2654908B1 - Bodyboard with thermal engine suitable for use between waves - Google Patents

Bodyboard with thermal engine suitable for use between waves Download PDF

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Publication number
EP2654908B1
EP2654908B1 EP11794812.5A EP11794812A EP2654908B1 EP 2654908 B1 EP2654908 B1 EP 2654908B1 EP 11794812 A EP11794812 A EP 11794812A EP 2654908 B1 EP2654908 B1 EP 2654908B1
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Prior art keywords
hull
bodyboard
water
engine
user
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EP11794812.5A
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German (de)
French (fr)
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EP2654908A1 (en
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Marc VAUDORE
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Vaudore Marc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B32/00—Water sports boards; Accessories therefor
    • B63B32/10—Motor-propelled water sports boards
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B35/00—Swimming framework with driving mechanisms operated by the swimmer or by a motor
    • A63B35/08—Swimming framework with driving mechanisms operated by the swimmer or by a motor with propeller propulsion
    • A63B35/12—Swimming framework with driving mechanisms operated by the swimmer or by a motor with propeller propulsion operated by a motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B32/00—Water sports boards; Accessories therefor
    • B63B32/20—Boards specially adapted for use in a prone position, e.g. wild-water sledges
    • B63B32/22—Bodyboards for surfing; Accessories specially adapted therefor

Definitions

  • the present invention is a bodyboard with a thermal engine, able to evolve in planing and in the waves.
  • CAYAGO www.cayago.com
  • CAYAGO is another reference to the more comparable sensations, in electric version : the company offers an electric boating solo electric, performing on the surface with a speed of 15 to 20 km / h for 5 to 6 hp, and can also go down to 50 m depth, and thus abandoning the flat shape for a form of shells suitable for diving the craft.
  • the product displays a weight of 60 kg, for a remaining autonomy limited to one hour of use, besides a rather dissuasive cost of these technologies.
  • the technical invention that it requires is also very particular in the arrangement of the constituent parts and in the devices that it embeds.
  • the invention relates to a motor-driven bodyboard according to claim 1.
  • the user is therefore flat on the water, gripping the machine by hands, which may be handles or other located on the top of the upper bodyboard, called the hull.
  • Part of the hull remains emerged at the stop as in navigation.
  • the shape and material of the hull may vary (bodyboard, small ventral surf as non-limiting examples): any hull that gives buoyancy to the user, but which remains insufficient for a user of 80 kg to allow him a position of standing navigation, and also insufficient for the craft to float with a user out of water of 80 kg lying on the machine.
  • the craft is not a boat, but a propeller.
  • the machine is less than 2 meters long.
  • the user rest his forearms and possibly part of his bust on the hull, legs dragging in the water behind the machine, because it is directed by pulling on one or the other of his arms to guide his navigation, his legs acting as a rudder.
  • the user accelerates and slows down by means of an acceleration command.
  • This block of propulsion may find it advantageous to be located at a distance of a few centimeters (at least 2 cm) below the planing hull of the hull, so as not to alter the water flows on which the hull of the hull is supported and ricocheted. navigation phase.
  • the propulsion unit can be connected to the bodyboard by rigid and profiled connecting pieces, or spacers.
  • An electric starter also allows access to the engine power range of 5 to 7 hp here needed for the gear for the target speed.
  • the machine must also embark a system to compensate for the possible water infiltration by the air intake towards the carburetor of the engine, in this program of waves where the projections of water can often occur, and side exhausts, taking into account turbulent movements.
  • the engine speed is idle, so that the machine stops while remaining in operation, it can be provided with a clutch between the propeller to the motor shaft, centrifugal type or other.
  • the engine exhaust gas duct opens below the waterline of the vehicle when put into the water.
  • the user must be able to leave the machine off for a long time in the water, then take it back at this location and restart it.
  • the machine must therefore embark a system to prevent upwelling harmful seawater to the engine, due to the retraction of flue gases (600-700 °) during cooling, and their exfiltrations. Indeed, the circuit traversed by the air-fuel mixture of a 2-stroke engine is not very tight, in the opposite direction to the tuba.
  • the solution provides for the use of an electric micro-pump, periodically blowing air into the exhaust, and / or a manual or automatic tilted valve.
  • the machine aims for an ultra-light empty weight around 10 kg, which allows the machine to be pleasantly portable in a backpack.
  • the embodiment presented as an example of implementation consists of 2 parts: the propulsion unit and the shell.
  • the two parts are separated by a few centimeters and connected by some connecting pieces (8) or spacers.
  • the attached diagram gives the illustration of an embodiment from a bodyboard, but this could only be a simple example of the form of the ventral surf. It describes the principle of mounting the machine, without its fairing or its handles, and with a non-integrated tank.
  • the user puts his thruster into the water, switches on the general electric switch, engages the machine and presses the push button of the electric starter to start the engine. Then it regulates its speed by the manual control of acceleration.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Toys (AREA)
  • Exhaust Silencers (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Catching Or Destruction (AREA)

Description

La présente invention est un bodyboard à moteur thermique, apte à évoluer au planing et dans les vagues.The present invention is a bodyboard with a thermal engine, able to evolve in planing and in the waves.

Sa fonction et ses caractéristiques visent à tracter l'usager dans l'eau, au-delà de la vitesse de déjaugeage du bodyboard, donc au planing, et à naviguer à une vitesse située autour de 15 km/h en position de bodydrag. Ainsi l'usager peut évoluer dans les vagues, les rattraper et les dépasser ensuite, en surf ventral, en veillant si possible à ce qu'elles ne cassent pas sur l'engin.Its function and its characteristics aim at towing the user in the water, beyond the planing speed of the bodyboard, so planing, and to sail at a speed around 15 km / h in position of bodydrag. Thus the user can evolve in the waves, catch up and overtake them, in ventral surfing, ensuring if possible that they do not break on the machine.

ART ANTERIEUR :PRIOR ART:

Les solutions d'engins nautiques légers et motorisés, et qui ne rentrent pas sous la dénomination d'embarcation (pas de flottabilité suffisante pour embarquer une personne debout, assise ou allongée) sont peu nombreuses.Solutions of light and motorized watercraft, which do not come under the name of boat (no buoyancy sufficient to board a person standing, sitting or lying) are few.

HONDA ( JP 2007203866 ) diffuse un scooter sous-marin à moteur thermique qui, en navigation, est donc complètement immergé sous l'eau excepté son tuba : il s'agit de la version à motorisation thermique des scooters sous-marins électriques. Ce concept reste éloigné et incompatible avec les impératifs nécessaires à la présente invention, et qui sont :

  • l'existence en propre d'une coque nautique qui doit rester émergée en navigation,
  • un démarreur électrique, par opposition à un lanceur manuel, pour la rapidité et pour la gamme de moteur nécessaire
  • un système anti-retour d'eau dans le moteur par l'échappement, lorsque celui-ci est coupé
  • et d'autres équipements nécessaires au programme visé de planing et vagues, qui sont décrits ci-après.
HONDA ( JP 2007203866 ) distributes an underwater motor scooter which, in navigation, is completely submerged under water except its snorkel: it is the version with thermal engine of electric underwater scooters. This concept remains remote and incompatible with the requirements necessary for the present invention, and which are:
  • the existence of a nautical hull, which must remain visible in navigation,
  • an electric starter, as opposed to a manual launcher, for speed and for the necessary engine range
  • a system to prevent backflow of water into the engine by the exhaust, when it is cut
  • and other equipment required for the intended planing and wave program, which is described below.

CAYAGO (www.cayago.com) est une autre référence aux sensations plus comparables, en version électrique : la société propose un propulseur nautique individuel électrique, performant en surface avec une vitesse de 15 à 20 km/h pour 5 à 6 CV, et pouvant en outre descendre à 50 m de profondeur, et donc abandonnant la forme plate pour une forme d'obus apte à la plongée de l'engin. Toutefois, compte tenu des batteries électriques nécessaires à un programme de plongée et aux belles performances délivrées, le produit affiche un poids de 60 kg, pour une autonomie restant limitée à une heure d'utilisation, outre un coût assez dissuasif de par ces technologies. CAYAGO ( www.cayago.com ) is another reference to the more comparable sensations, in electric version : the company offers an electric boating solo electric, performing on the surface with a speed of 15 to 20 km / h for 5 to 6 hp, and can also go down to 50 m depth, and thus abandoning the flat shape for a form of shells suitable for diving the craft. However, given the electric batteries required for a diving program and the good performance delivered, the product displays a weight of 60 kg, for a remaining autonomy limited to one hour of use, besides a rather dissuasive cost of these technologies.

Le brevet anglais N° GB2270282i présente de façon générale un bodyboard à moteur thermique. Cependant, quatre points importants pour la viabilité de l'engin, pour son intérêt et son extension à un programme d'utilisation en vitesse et en vagues, n'ont pas été identifiés ni solutionnés à ce jour:

  • puisque le moteur thermique tout comme l'échappement des gaz sont situés sous la ligne de flottaison, dès lors que l'appareil prévoit de pouvoir s'arrêter et rester à l'arrêt dans une eau éventuellement agitée, on fait face à un problème de remontée certaine de l'eau dans le moteur par l'échappement, ceci-même dès le refroidissement et la rétractation des gaz brûlés présents dans l'échappement, L'échappement étant très court, c'est-à-dire de seulement quelques centimètres, avec des gaz d'autant plus brûlants, qui peuvent véhiculer l'huile du moteur 2 temps (mélange à 2 à 3%), l'engin doit disposer d'un système contrant ou bloquant l'arrivée de l'eau dans le moteur, peu sensible dans le temps à la température élevée et à l'huile, et sans entretien.
  • pour viser un programme de vitesse au planning et de vagues, un engin de cette nature, qui est ralenti par les turbulences importantes du corps de l'utilisateur dans l'eau, nécessite une poussée mécanique disponible à partir d'une puissance de moteur de l'ordre de 5 CV ou plus. Une telle puissance moteur n'est pas raisonnablement démarrable par quiconque avec un lanceur manuel, a fortiori en mer sans appui ferme sur le sol. La débauche d'énergie humaine mettrait en cause la sécurité de l'utilisateur : crampes, fatigue rapide, grosse vague approchant ... avec de plus une probabilité très faible de pouvoir démarrer au premier essai. L'invention visant ici un programme de vitesse et de vagues exige donc que l'invention soit obligatoirement pourvue d'un démarrage automatique (démarreur à moteur électrique)
  • pour accéder à un programme de navigation dans les vagues avec les risques inhérents de chavirage et de vague cassant sur l'engin, celui-ci doit disposer d'un dispositif d'obturation automatique de la prise d'air par le tuba sur déclenchement manuel ou d'un capteur
  • enfin pour garder le moteur démarré au ralenti, sans souhaiter un quelconque déplacement, un dispositif d'embrayage peut être utile.
The English patent N ° GB2270282i generally presents a bodyboard with a heat engine. However, four important points for the viability of the machine, for its interest and its extension to a program of use in speed and waves, have not been identified or solved to date:
  • since the engine as well as the exhaust gas are located under the line of floatation, since the aircraft plans to be able to stop and remain stationary in water possibly agitated, one faces a problem of certain reassembly of the water in the engine by the exhaust, this very after the cooling and the retraction of the burned gases present in the exhaust, the exhaust being very short, that is to say of only a few centimeters, with gas all the more burning, which can convey the oil of the 2-stroke engine (mixing at 2 to 3%), the machine must have a system that counteracts or blocks the arrival of water into the engine, which is not very sensitive in time to the high temperature and the oil, and without maintenance.
  • to target a planning and wave speed program, a craft of this nature, which is slowed by the significant turbulence of the user's body in the water, requires a mechanical thrust available from an engine power of the order of 5 hp or more. Such engine power is not reasonably bootable by anyone with a manual launcher, let alone at sea without firm support on the ground. The debauchery of human energy would compromise the safety of the user: cramps, fast fatigue, big wave approaching ... with a very low probability of being able to start on the first try. The invention aimed here at a speed and wave program therefore requires that the invention be compulsorily provided with an automatic start (electric motor starter).
  • to access a wave navigation program with the inherent risks of capsize and brittle wave on the craft, it must have a device for automatically shutting off the air intake by the snorkel on manual release or a sensor
  • finally to keep the engine idling without wishing any displacement, a clutch device can be useful.

Il n'y a donc pas actuellement d'invention qui apporte ces solutions aux besoins et aux points clés précédemment exposés.So there is currently no invention that brings these solutions to the needs and key points previously discussed.

L'activité classique de bodyboard est reconnue et figure parmi les sports dotés de circuits mondiaux de compétition. Le bodyboard motorisé est une activité et une invention qui n'existent pas encore :

  • elle invente un nouveau loisir nautique motorisé et ultra-léger
  • elle pourrait un jour faire figure de sport motorisé avec son circuit de compétitions, à l'instar du succès atteint par le jet-ski
  • elle pourrait servir à équiper la surveillance des plages dangereuses à la baignade
  • elle peut servir à remorquer sans permis bateau des surfers ou des kitesurfers
  • elle permet en outre une forme de randonnée rapide et ludique, en mer, lac ou rivière..
The classic bodyboard activity is recognized and is one of the sports with world competitive circuits. Motorized bodyboarding is an activity and an invention that does not exist yet:
  • she invented a new motorized and ultralight nautical leisure
  • it could one day be a motor sport with its competition circuit, like the success achieved by the jet-ski
  • it could be used to equip the surveillance of dangerous beaches for swimming
  • it can be used to tow without a license boat surfers or kitesurfers
  • it also allows a form of fast and fun hiking, sea, lake or river ..

L'invention technique qu'elle nécessite est également toute particulière dans l'agencement des parties constituantes et dans les dispositifs qu'elle embarque.The technical invention that it requires is also very particular in the arrangement of the constituent parts and in the devices that it embeds.

L'INVENTION:THE INVENTION

L'invention concerne un bodyboard à moteur thermique selon la revendication 1.The invention relates to a motor-driven bodyboard according to claim 1.

L'usager est donc à plat ventre dans l'eau, agrippé à l'engin par des prises de mains, qui peuvent être des poignées ou autres situées sur le dessus de la partie supérieure du bodyboard, dite la coque. Une partie de la coque reste émergée à l'arrêt comme en navigation. La forme et la matière de la coque peuvent varier (bodyboard, petit surf ventral comme exemples non limitatifs) : toute coque nautique qui confère une flottabilité à l'usager, et qui reste toutefois insuffisante pour un usager de 80 kg pour lui permettre une position de navigation debout, et insuffisante également pour que l'engin flotte avec un usager hors d'eau de 80 kg allongé sur l'engin. Ainsi, au titre des législations les plus courantes, l'engin n'est pas une embarcation, mais un propulseur. L'engin fait moins de 2 mètres.de longueur.The user is therefore flat on the water, gripping the machine by hands, which may be handles or other located on the top of the upper bodyboard, called the hull. Part of the hull remains emerged at the stop as in navigation. The shape and material of the hull may vary (bodyboard, small ventral surf as non-limiting examples): any hull that gives buoyancy to the user, but which remains insufficient for a user of 80 kg to allow him a position of standing navigation, and also insufficient for the craft to float with a user out of water of 80 kg lying on the machine. Thus, under the most current legislation, the craft is not a boat, but a propeller. The machine is less than 2 meters long.

L'usager repose ses avant-bras et éventuellement une partie de son buste sur la coque, les jambes traînant dans l'eau derrière l'engin, car il se dirige en tirant sur l'un ou l'autre de ses bras pour orienter sa navigation, ses jambes faisant office de gouvernail. L'usager accélère et ralentit au moyen d'une commande d'accélération.The user rest his forearms and possibly part of his bust on the hull, legs dragging in the water behind the machine, because it is directed by pulling on one or the other of his arms to guide his navigation, his legs acting as a rudder. The user accelerates and slows down by means of an acceleration command.

Pour des raisons d'optimisation acoustique, de stabilité et de refroidissement, tout ou partie du moteur se trouve être sous la ligne de flottaison de l'engin.For reasons of acoustic optimization, stability and cooling, all or part of the engine is below the waterline of the machine.

Sous la coque ou intégré à la coque, selon l'épaisseur de celle-ci lors de réalisation, se situe donc la partie propulsive de l'engin. Ce bloc de propulsions peut trouver intérêt à être situé distant de quelques centimètres (au moins 2 cm) sous la carène planante de la coque, pour ne pas altérer les écoulements d'eau sur lesquels s'appuie et ricoche la carène de la coque en phase de navigation. Dans ce cas, le bloc de propulsion peut être relié au bodyboard par des pièces de liaison rigides et profilées, ou entretoises.Under the hull or integrated into the hull, depending on the thickness of it during production, is therefore the propulsive part of the machine. This block of propulsion may find it advantageous to be located at a distance of a few centimeters (at least 2 cm) below the planing hull of the hull, so as not to alter the water flows on which the hull of the hull is supported and ricocheted. navigation phase. In this case, the propulsion unit can be connected to the bodyboard by rigid and profiled connecting pieces, or spacers.

Dû à sa vocation, il faut aussi que l'engin soit redémarré rapidement entre deux vagues, et dans l'eau, là où l'utilisateur n'a pas forcément pied, donc électriquement. Un démarreur électrique permet de plus d'accéder à la gamme de puissances de moteurs de 5 à 7 CV ici nécessaires à l'engin pour la vitesse visée.Due to its vocation, it is also necessary that the machine is restarted quickly between two waves, and in the water, where the user does not necessarily foot, so electrically. An electric starter also allows access to the engine power range of 5 to 7 hp here needed for the gear for the target speed.

L'engin doit également embarquer un système pour compenser les infiltrations d'eau possibles par la prise d'air vers le carburateur du moteur, dans ce programme de vagues où les projections d'eau peuvent souvent survenir, et côté échappements, compte tenu des mouvements turbulents. Lorsque le régime moteur est au ralenti, pour que l'engin s'immobilise en restant en marche, il peut être muni d'un embrayage entre l'hélice à l'arbre moteur, de type centrifuge ou autre. Pour des raisons de nuisances sonores et olfactives, le conduit d'échappement des gaz du moteur débouche sous la ligne de flottaison de l'engin lorsqu'il est mis dans l'eau. De plus, l'usager doit pouvoir laisser l'engin éteint de longs moments dans l'eau, puis le reprendre à cet endroit et le redémarrer. L'engin doit donc embarquer un système pour empêcher toute remontée d'eau de mer nuisible vers le moteur, due à la rétractation des gaz brûlés (600-700°) lors du refroidissement, ainsi qu'à leurs exfiltrations. En effet, le circuit parcouru par le mélange air-essence d'un moteur 2 temps n'est pas très étanche, en sens inverse vers le tuba. La solution prévoit l'utilisation d'une micro-pompe à air, électrique, insufflant périodiquement de l'air dans l'échappement, et/ou une vanne basculée manuellement ou automatiquement.The machine must also embark a system to compensate for the possible water infiltration by the air intake towards the carburetor of the engine, in this program of waves where the projections of water can often occur, and side exhausts, taking into account turbulent movements. When the engine speed is idle, so that the machine stops while remaining in operation, it can be provided with a clutch between the propeller to the motor shaft, centrifugal type or other. For reasons of noise and odor nuisance, the engine exhaust gas duct opens below the waterline of the vehicle when put into the water. In addition, the user must be able to leave the machine off for a long time in the water, then take it back at this location and restart it. The machine must therefore embark a system to prevent upwelling harmful seawater to the engine, due to the retraction of flue gases (600-700 °) during cooling, and their exfiltrations. Indeed, the circuit traversed by the air-fuel mixture of a 2-stroke engine is not very tight, in the opposite direction to the tuba. The solution provides for the use of an electric micro-pump, periodically blowing air into the exhaust, and / or a manual or automatic tilted valve.

Lors de l'éviction possible de l'usager hors d'atteinte de son engin, un dispositif peut être prévu pour la double sécurité de l'usager et de la machine :

  • une détection de l'éviction de l'usager, par le relâchement d'une gâchette sur la poignée, d'un cordon de sécurité arraché, ou d'un autre capteur
  • une obturation automatique de la prise d'air alimentant le moteur, par relâchement d'un clapet, avec un arrêt immédiat du moteur.
When the user can be evicted out of reach of his machine, a device can be provided for the double security of the user and the machine:
  • detection of the eviction of the user, by releasing a trigger on the handle, a safety cord torn off, or another sensor
  • an automatic closing of the air intake supplying the engine, by releasing a valve, with an immediate stop of the engine.

Enfin, pour des raisons de transport par avion, ou pour utiliser le bodyboard tout seul sans moteur de façon classique, on peut prévoir de pouvoir rapidement et facilement séparer la partie moteur de la partie bodyboard, au niveau des pièces de liaison du bloc de propulsion à la coque. L'engin vise un poids à vide ultra-léger autour de 10 kg, ce qui permet à l'engin d'être portable agréablement en sac à dos.Finally, for reasons of transport by plane, or to use the bodyboard alone without a motor in a conventional manner, it can be expected to quickly and easily separate the motor part of the bodyboard part, at the connecting parts of the propulsion unit soft-boiled. The machine aims for an ultra-light empty weight around 10 kg, which allows the machine to be pleasantly portable in a backpack.

REALISATION :PRODUCTION :

La réalisation présentée à titre d'exemple de mise en oeuvre est constituée de 2 parties : le bloc de propulsion et la coque.The embodiment presented as an example of implementation consists of 2 parts: the propulsion unit and the shell.

Les 2 parties sont distantes de quelques centimètres et reliées par quelques pièces de liaison (8) ou entretoises.The two parts are separated by a few centimeters and connected by some connecting pieces (8) or spacers.

Le schéma joint donne l'illustration d'un mode de réalisation à partir d'un bodyboard, mais ceci ne saurait être qu'un simple exemple de mise en oeuvre de forme du surf ventral. Il décrit le principe de montage de l'engin, sans son carénage ni ses poignées, et avec un réservoir non intégré.The attached diagram gives the illustration of an embodiment from a bodyboard, but this could only be a simple example of the form of the ventral surf. It describes the principle of mounting the machine, without its fairing or its handles, and with a non-integrated tank.

La partie en surface comprend :

  • une coque à carène planante (1) ici longue de 1,20 mètre, qui est globalement plate, mais qui peut présenter des artifices qui augmentent sa capacité au planing ou au cap : une coupe en léger V, tunnels, décrochements ... ou une forme légèrement spatulée à l'avant pour mieux passer les vagues
  • la carène planante est en matière légère et assez rigide pour les qualités mécaniques recherchées. Cette carène n'est pas translucide et ne concède rien à toute autre finalité que celle décrite, elle ne permet pas l'usage de cet engin à des fins de visionner le décor sous-marin
  • un tuba (2) amenant l'air de surface dans la cloche d'air étanche (9) isolant le carburateur de l'eau de mer. Un tuba large permet éventuellement le passage jusqu'au bloc de propulsion de la commande d'accélération (5), du tuyau d'essence et des fils d'alimentation électrique
  • un clapet dans la prise d'air du moteur, en option, et qui est basculé en position obturée lorsque l'éviction de l'usager est détectée : par le relâchement d'une gâchette, d'un cordon de sécurité arraché, ou d'un autre capteur, le moteur est alors arrêté
  • les inserts des entretoises (7) dans le bodyboard : en pinçant la mousse rigide du bodyboard par de larges rondelles de part et d'autre, ou des inserts noyés dans la résine, sur la base d'un petit surf ventral en matériau plus rigide
  • un réservoir d'essence de 2 ou 3 litres (3), idéalement moulé dans la partie émergée. Le réservoir pourra être muni de chicanes pour estomper les mouvements d'essence dus à la navigation
  • un pack de batteries (4) alimentant l'allumage électronique du moteur à essence (10), le démarreur (11) et la micro-pompe (15), et les systèmes électroniques ou électromécaniques d'asservissement du clapet et de la micro-pompe
  • quelques fonctions de commandes associées près des poignées, notamment :
    • o un coupe-circuit signalant l'éviction de l'usager
    • o un bouton-poussoir de mise en marche du démarreur et d'arrêt o une gâchette d'accélérateur du moteur
    • o il peut y avoir un système d'accrochage d'un harnais porté par l'usager, à l'arrière du bodyboard, ceci pour les vitesses élevées tirant trop longtemps sur les bras. Cette activité qui peut s'avérer très physique selon la cadence des changements de trajectoires et de rythmes enchaînés.
The surface part includes:
  • a planing hull hull (1) here 1.20 meters long, which is generally flat, but which may have artifices that increase its ability to planing or heading: a cut in light V, tunnels, recesses ... or a slightly spatulate shape at the front to better pass the waves
  • the planing hull is lightweight and rigid enough for the desired mechanical qualities. This hull is not translucent and does not concede anything for any purpose other than described, it does not allow the use of this machine for the purpose of viewing the underwater scenery
  • a snorkel (2) bringing the surface air into the sealed air chamber (9) isolating the carburettor from the seawater. A wide snorkel optionally allows the passage to the propulsion unit of the throttle control (5), fuel line and power supply wires
  • a check valve in the engine air intake, which is optional, and is tilted to the closed position when user eviction is detected: by releasing a trigger, a safety cord torn off, or 'another sensor, the engine is stopped
  • the inserts of the struts (7) in the bodyboard: by pinching the rigid foam of the bodyboard by large washers on either side, or inserts embedded in the resin, on the basis of a small ventral surf in stiffer material
  • a gas tank of 2 or 3 liters (3), ideally molded in the emergent part. The tank may be equipped with baffles to reduce the movement of gasoline due to navigation
  • a battery pack (4) supplying the electronic ignition of the gasoline engine (10), the starter (11) and the micro-pump (15), and the electronic or electromechanical servocontrol systems of the valve and the micro- pump
  • some control functions associated with the handles, including:
    • o a circuit breaker indicating the eviction of the user
    • o a starter start and stop button o an engine throttle trigger
    • o There may be a system for attaching a harness carried by the user, behind the bodyboard, this for high speeds pulling too long on the arms. This activity can be very physical depending on the pace of changes of trajectories and rhythms chained.

Le bloc de propulsion comprend :

  • un bâti d'assemblage (17) des différents éléments et du carénage
  • un démarreur électrique débrayable (11)
  • un moteur thermique léger et performant (10)
  • un conduit d'échappement (13) avec inclinaison vers le bas de sa sortie (siphon d'air) et évacuant les gaz brûlés au niveau du puissant flux d'eau sortant de l'hydrojet, en fines bulles réduisant ainsi le bruit généré et à plusieurs mètres derrière l'usager
  • éventuellement, un embrayage pour faciliter initialement le travail du démarreur, et ultérieurement pouvoir laisser l'engin immobile en restant moteur allumé au régime de ralenti
  • un système hydrojet (12) constitué d'une hélice logée dans une tuyère, comme un jet-ski,
  • un système anti-retour d'eau de mer vers le moteur, dans le conduit d'échappement, faisant ici le choix d'une micro-pompe à air électrique (15), insufflant l'air dans l'échappement, et pouvant être fonctionnelle lorsque l'engin est en marche ou également à l'arrêt au mouillage
  • un système de purge des infiltrations d'eau dans la prise d'air moteur, au niveau du tuba ou du bas de la cloche d'isolation du carburateur, pouvant être constitué de la même micro-pompe électrique, puisant ici l'air et parfois l'eau infiltrée pour rejeter le tout dans l'échappement.
  • un carénage propre au bloc de propulsion (ici ôté sur la figure), fixé à lui, et qui n'englobe pas la planche, pour ne pas diminuer la surface de la carène offrant le planing, Il dispose d'ouvertures pour orienter les flux d'eau vers le carter du moteur à des fins de refroidissement, et vers le système hydrojet, à des fins de propulsion.
  • un allumage électronique (16), de préférence, alimente la bougie du moteur
  • le bâti (17) supporte l'assemblage des éléments mécaniques et transmet la poussée au bodyboard, par l'intermédiaire des 4 entretoises (8) de fixation. Le bâti est ici constitué de 2 longerons en profilés de carbone réunis par assemblage, de section 20x10 mm et longs de 50 cm.
  • l'arbre d'hélice sera centré sur sa longueur par les roulements à billes et une butée de roulement, logés dans un pylône (14). La poussée axiale créée par la propulsion hydrojet est transmise au bâti par le pylône, lui-même solidement vissé au bâti. Ainsi le moteur à essence n'a pas à supporter de force axiale importante
The propulsion block comprises:
  • an assembly frame (17) of the various elements and the fairing
  • a disengageable electric starter (11)
  • a light and powerful engine (10)
  • an exhaust duct (13) with a downward inclination of its outlet (air siphon) and evacuating the flue gases at the powerful stream of water leaving the hydrojet, in fine bubbles thus reducing the noise generated and several meters behind the user
  • possibly, a clutch to initially facilitate the work of the starter, and subsequently be able to leave the machine stationary while remaining engine running at the speed of slow motion
  • a hydrojet system (12) consisting of a propeller housed in a nozzle, such as a jet-ski,
  • a seawater anti-return system to the engine, in the exhaust duct, here making the choice of a micro-electric air pump (15), blowing air into the exhaust, and which can be functional when the machine is running or also stopped at anchor
  • a system for purging water infiltrations into the engine air intake, at the level of the tuba or the bottom of the carburetor insulation bell, which can be constituted by the same electric micro-pump, drawing air here and sometimes the water infiltrated to reject everything in the exhaust.
  • a fairing specific to the propulsion unit (here removed in the figure), attached to it, and which does not cover the board, so as not to reduce the surface of the hull offering the planing, It has openings to guide the flow water to the engine crankcase for cooling purposes, and to the hydrojet system, for propulsion purposes.
  • an electronic ignition (16), preferably, supplies the spark plug of the engine
  • the frame (17) supports the assembly of the mechanical elements and transmits the thrust to the bodyboard, through the 4 spacers (8) of attachment. The frame here consists of 2 longitudinal members of carbon profiles joined together, section 20x10 mm and 50 cm long.
  • the propeller shaft will be centered on its length by the ball bearings and a bearing stop, housed in a pylon (14). The axial thrust created by the hydrojet propulsion is transmitted to the frame by the pylon, itself securely screwed to the frame. So the gas engine does not have to endure significant axial force

Des précautions sont nécessaires pour faire marcher sous l'eau un moteur à essence qui n'est pas un candidat naturel à fonctionner dans cet élément. Voici les caractéristiques particulières à prévoir autour du système de propulsion pour rendre viable ce choix techniquement audacieux :

  • l'étanchéité de sortie d'axe moteur est favorisée par le choix d'un moteur 2 temps, plutôt que 4 temps : dans le cas d'un moteur 2 temps, l'étanchéité est assurée nativement par des roulements à billes étanches, compte tenu des dépressions et surpressions du mélange gazeux air-essence-huile circulant dans le carter du vilebrequin, avant d'être injecté vers le cylindre. On peut éventuellement doubler cette étanchéité par un joint à lèvres graissé.
  • le démarreur électrique sera idéalement dans le carter du moteur, sinon il devra être adapté aux contraintes du milieu sous-marin du fait d'existence de pièces mobiles.
  • les pièces sont de préférence en matière composites pour rester peu sensibles aux problèmes de corrosion
  • les surfaces des pièces métalliques peuvent être protégées par les techniques usuelles anticorrosion : anodisation, traitement de surface, anode sacrificielle en zinc ou magnésium, recouvrement de surface, coulage de résine ... La corrosion marine n'est toutefois pas aussi importante que dans les ports présentant une forte présence de masses métalliques : dans le cas présent d'utilisation visée, la mise à l'eau intermittente et un rinçage quotidien ajouté aux autres précautions ci-dessus suffisent à limiter conséquemment la corrosion
Precautions are required to operate underwater a gasoline engine that is not a natural candidate to operate in this element. Here are the special features to plan around the propulsion system to make this technically bold choice viable:
  • the motor shaft output seal is favored by the choice of a 2-stroke engine, rather than 4-stroke: in the case of a 2-stroke engine, the seal is natively ensured by sealed ball bearings. the depressions and overpressures of the gaseous air-gasoline-oil mixture circulating in the crankcase of the crankcase, before being injected towards the cylinder. This seal can possibly be doubled by a greased lip seal.
  • the electric starter will ideally be in the motor housing, otherwise it will have to be adapted to the constraints of the underwater environment due to the existence of moving parts.
  • the parts are preferably composite materials to remain insensitive to corrosion problems
  • the surfaces of the metal parts can be protected by the usual anti-corrosion techniques: anodizing, surface treatment, sacrificial anode zinc or magnesium, surface coating, resin casting ... Marine corrosion is however not as important as in the ports with a high presence of metallic masses: in the present case of intended use, the intermittent launching and daily rinsing added to the other precautions above are sufficient to limit the corrosion accordingly

Les principaux postes de poids sont localisés dans les éléments suivants :

  • le moteur thermique comptera 2 kg, pour 5 à 7 CV
  • le démarreur électrique comptera malheureusement environ 1 kg
  • la batterie comptera 0,5 à 1 kg
  • l'adjonction d'un embrayage centrifuge compact et rendu étanche, similaire en taille à ce qui existe dans certains coupe-herbes rotatifs pour jardins, comptera 0,5 kg
The main weight items are located in the following items:
  • the heat engine will count 2 kg, for 5 to 7 HP
  • the electric starter will unfortunately count about 1 kg
  • the battery will be 0.5 to 1 kg
  • the addition of a compact and sealed centrifugal clutch, similar in size to what exists in some rotary garden weed cutters, will be 0.5 kg

Il est donc possible de réaliser l'invention pour un poids total à vide (hors carburant) de moins de 10 k g, bodyboard compris, comme le montage joint en schéma. Selon la vitesse de rotation du moteur retenu, et pour minimiser les phénomènes de cavitation dans le flux d'eau brassé, il faudra adopter une bonne combinaison des éléments influençant la charge et l'efficacité du moteur : le pas d'hélice et la surface d'hélice, l'adoption de cônes d'hélice anti-cavitation devant et derrière l'hélice, et au pire, une éventuelle boîte de réduction sur l'axe d'hélice.It is therefore possible to realize the invention for a total empty weight (excluding fuel) of less than 10 kg, bodyboard included, as the assembly attached schematic. Depending on the rotational speed of the engine selected, and to minimize the cavitation phenomena in the stirred water flow, it will be necessary to adopt a good combination of the elements influencing the load and the efficiency of the engine: the pitch of the propeller and the surface propeller, the adoption of anti-cavitation propeller cones in front of and behind the propeller, and at worst, a possible reduction box on the propeller axis.

L'usager met son propulseur à l'eau, enclenche l'interrupteur électrique général, agrippe l'engin et appuie sur le bouton-poussoir du démarreur électrique pour lancer le moteur thermique. Puis il régule sa vitesse par la commande manuelle d'accélération.The user puts his thruster into the water, switches on the general electric switch, engages the machine and presses the push button of the electric starter to start the engine. Then it regulates its speed by the manual control of acceleration.

Claims (7)

  1. Bodyboard having a heat engine, performing the function of towing the user through the water, and comprising:
    - a hull providing buoyancy, said hull
    o being a bodyboard (1) or boogieboard, or any marine hull,
    o remaining partially above the surface in the travelling phase
    o having a small size, such that it does not provide sufficient buoyancy to allow an adult user a travelling position standing thereon and that it does not float with an adult user lying thereon being out of the water
    o having an acceleration control (5)
    o having hand-holds (18), situated on the upper side of the hull,
    - and a propulsion unit
    o situated underneath the hull or in the hull
    o containing a heat engine (10) situated at least partially below the waterline of the bodyboard having a heat engine and supplied with air via a snorkel (2),
    o containing an electric starter (11), a propeller/tube system (12), and an exhaust pipe (13) capable of discharging the combustion gases and having an outlet below the surface of the water
    o the exhaust pipe being equipped with a water non-return system, preventing water reaching the engine via the exhaust pipe, when the engine is stopped,
    characterised in that the water non-return system comprises an electric micro air pump (15), opposing said reaching of water.
  2. Bodyboard according to claim 1, characterized in that the water non-return system comprises a valve closing the exhaust pipe, operated manually or automatically
  3. Bodyboard according to one of claims 1 to 2, comprising:
    o a sensor detecting that the user has been removed: by the release of a trigger, a safety lanyard being pulled away, or other
    o a mechanism automatically closing the snorkel, activated in the event of the user falling off.
  4. Bodyboard according to one of claims 1 to 3, equipped with a clutch allowing the propeller to be immobile without stopping the engine.
  5. Bodyboard according to claim 4, equipped with a centrifugal clutch.
  6. Bodyboard according to one of claims 1 to 5, characterized in that:
    o the propulsion unit is underneath the hull separated by at least 2 centimetres from the face of the hull which is in contact with the water
    o and that it is attached to the hull by connecting parts
    o these connecting parts being optionally removable to allow the hull to be separated from the propulsion unit.
  7. Bodyboard according to one of claims 1 to 6, characterized in that:
    o the hull has a shape faired for planing
    o the hull is not translucent, such that it does not enable the craft to be used to view the surroundings underwater
    o the handholds are handles.
EP11794812.5A 2010-12-20 2011-11-10 Bodyboard with thermal engine suitable for use between waves Active EP2654908B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1004972A FR2969116B1 (en) 2010-12-20 2010-12-20 BODYBOARD WITH THERMAL MOTOR FOR EVOLUTION IN WAVE
PCT/FR2011/052620 WO2012085368A1 (en) 2010-12-20 2011-11-10 Bodyboard having a heat engine and capable of moving in waves

Publications (2)

Publication Number Publication Date
EP2654908A1 EP2654908A1 (en) 2013-10-30
EP2654908B1 true EP2654908B1 (en) 2016-08-03

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US (1) US8978571B2 (en)
EP (1) EP2654908B1 (en)
BR (1) BR112013009288A2 (en)
ES (1) ES2594529T3 (en)
FR (1) FR2969116B1 (en)
PT (1) PT2654908T (en)
WO (1) WO2012085368A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102001490B1 (en) * 2016-12-13 2019-07-18 (주)보고 Diver propulsion device
CN109398655B (en) * 2018-11-16 2023-09-08 湖南工程学院 Underwater robot with tilting function

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090293850A1 (en) * 2008-05-30 2009-12-03 Brp-Rotax Gmbh & Co. Kg Supercharged engine

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Publication number Priority date Publication date Assignee Title
DE2052402A1 (en) * 1970-10-26 1972-04-27 Müller, Heinrich, 5350 Euskirchen Swimming diving device with electric motor drive and battery
US3890920A (en) * 1973-06-06 1975-06-24 Rockwell International Corp Controls for aquatic towing craft
FR2617793A1 (en) * 1987-07-09 1989-01-13 Trotet Jean Francois Motor board
AU676174B2 (en) * 1992-09-01 1997-03-06 Ronald Geoffrey Ditchfield Personal water surface towing device
US5568783A (en) * 1992-09-01 1996-10-29 Ditchfield; Ronald G. Personal water surface towing device
JP4219848B2 (en) * 2004-04-09 2009-02-04 本田技研工業株式会社 Underwater scooter
JP4711419B2 (en) 2006-02-01 2011-06-29 本田技研工業株式会社 Underwater scooter
ES2351473T3 (en) * 2007-04-05 2011-02-07 Joy Ride Technology Co., Ltd. SURF DEVICE PROPULSED BY HELIX.
DE202009000167U1 (en) * 2009-01-07 2009-04-02 Aghakhani, Ali Swimming kick board with electric motor and water screw

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Publication number Priority date Publication date Assignee Title
US20090293850A1 (en) * 2008-05-30 2009-12-03 Brp-Rotax Gmbh & Co. Kg Supercharged engine

Also Published As

Publication number Publication date
PT2654908T (en) 2016-10-03
EP2654908A1 (en) 2013-10-30
FR2969116A1 (en) 2012-06-22
US20130239862A1 (en) 2013-09-19
FR2969116B1 (en) 2013-06-21
WO2012085368A1 (en) 2012-06-28
US8978571B2 (en) 2015-03-17
ES2594529T3 (en) 2016-12-20
BR112013009288A2 (en) 2016-07-19

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