Machard vs prusik. Replied by TreeTramp on topic Re:Eyed Prusik cord vs.

Machard vs prusik. 5. Machard vymyslel uzel v této podobě! Apr 14, 2023 · A prusik is a knot, also known as a friction hitch, that you attach around a rope in rock climbing, canyoneering, caving, or mountaineering. Prusik Hitch vs. If the rope were to break (either to the left or the right of you), the prusik would save you. Posté en tant qu’invité par shere khan: Bonjour, J’aimerais confectionner un noeud auto bloquant pour le rappel, que me conseilleriez vous ? machard ou prussik ? quel diamétre de cordelette (ma corde fait 10. Valdotain Tresse How to tie the Valdotain Tresse Knot. La elección entre ellos dependerá del escenario específico y de los resultados deseados en términos de bloqueo y agarre. Posté en tant qu’invité par tiresias: Coucou, Une petite question concernant les noeuds autobloquants. Alternatively, pre-made loops can be purchased from climbing shops. Sep 6, 2017 · Autoblock: Also known as French Prusik, or Machard Tresse, is similar to Klemheist, but the ends of the wrapped loop are simply clipped into a carabiner. Il existe de nombreux nœuds autobloquants, souvent à choisir suivant la situation A friction hitch is a kind of knot used to attach one rope to another in a way that is easily adjusted. La práctica totalidad de nudos autobloqueantes y bloqueadores funciona con cuerda en simple y la mayoría de los nudos autobloqueantes pueden también utilizarse con cuerdas en doble (ejemplos incluyen el Prusik o el Machard). The Prusik Knot The good old prusik knot is very, very useful. Making Prusik Loops: Prusik loops may be constructed by joining together the two ends of an accessory cord (5 or 6 mm) using a Double Fisherman’s Bend (or a Triple Fisherman’s Bend). Machard (o Klemheist) Il nodo Machard (o Klemheist) appartiene alla categoria dei nodi autobloccanti come il nodo prusik ed il nodo bachmann. El frenado y la facilidad de desbloqueo pueden ajustarse en función del nombre de vueltas. De surcroit elle est Autoblock An autoblock using a Prusik knot on the left and an autoblock using the Machard knot ("autoblock knot") on the right. English Prusik Other names: Standard / common prusik, prusik hitchUse: DdRT onlyPros: Very safe, easy to use and recognis Nodo prusik Il nodo prusik, che appartiene alla categoria dei nodi "autobloccanti" (come il nodo machard), è molto utilizzato soprattutto in campo arrampicatorio e alpinistico. The Klemheist knot, also known as the Machard knot can be used to ascend or descend a climbing line. Aug 4, 2020 · The Petzl Tibloc, an ultralight emergency ascender, is a very handy piece of gear. #hitch #knot #climbing Feb 12, 2025 · In this article, we will delve into the top three friction hitches – the Prusik hitch, Schwabisch hitch, and Klemheist (Machard) – that are perfect for climbers of all levels. Download this stock image: Forming an Autoblock knot (also called Machard or French Prusik) with a 5mm accessory cord around a 9. Oct 9, 2008 · Replied by TreeTramp on topic Re:Eyed Prusik cord vs. It is popular with arborists. It also appears to be identical to the knot described by Ashley for securing a loop to a vertical pole. La prerogativa di questa tipologia di nodi è quella di entrare in funzione automaticamente quando siano messi in tensione o sotto carico. For example, if you were traversing using an old, fixed rope rigged horizontally, you could attach a prusik to it from your harness. Klemmknoten: FB-Kreuzklemmknoten vs. Si je ne me trompe pas, il faut relier les deux bouts de la cor ABOK 1762 Structure The Klemheist is tied using a Prusik loop, typically made from a short section of rope joined by a Double Fisherman's Knot. Immobile sous tension et mobile lorsqu'il est détendu. Dec 20, 2011 · Ante las preguntas que nos hacen los compañeros sobre el prúsik y el machard, hemos optado por buscar información para que, aquellos que tengan dudas saquen sus conclusiones y utilicen el nudo que mejor se adecue a sus intereses. On peut ainsi descendre en rappel avec une sécurité supplémentaire et sans risquer de se brûler les mains. Don’t use a sling for anything except a prusik after using it once as a prusik. Autoblock has lesser degree of friction, but sufficient enough to act as a brake backup for a rappel, and is the simplest and the quickest to setup for a rappel. Quelle longueur pour un Machard ? 3 odborníci, 12 uzlů a více než 30 různých příkladů použití je výsledek dalšího výukového projekt The Klemheist is also sometimes referred to as the French Machard knot. One advantage is that webbing can be used as an alternative to cord. Les nœuds autobloquants Les nœuds autobloquants sont systématiquement utilisés pour l’ auto-assurance lors des rappels, l’ assurage d’un second en escalade, ou pour les manœuvres de secours, telles que l’ auto-sauvetage ou mouflages en crevasse. The double fisherman’s knot is used to join two ends of rope or line together. Algunas variaciones o adaptaciones del nudo prusik que se pueden utilizar según las necesidades específicas de la actividad de montaña son el nudo autobloqueante Klemheist y el nudo Machard. All you need is a loop of cord which you can make using 6 or 7mm accessory cord and a double fisherman's knot. In fact, it’s one of the most popular “slide-and-grip knots Uses: A closed system friction hitch that releases more easily than a standard Prusik or tautline hitch. Il nodo machard (o nodo Klemheist) appartiene alla categoria dei nodi autobloccanti (come il nodo prusik ed il nodo bachmann). A demonstration of how the KLEMHEIST friction hitch is tied using either a sewn or knotted loop. Tous les deux se débloquent assez facilement. Ideal for creating auto-blocking knots such as the Prusik and Machard, this A bit later, the article mentions the Machard is a Valdotin but tied with a loop instead of an eye-to-eye tail. Suffice it to say it's worth learning this gem of a knot. Machard de un seno. Aug 3, 2009 · Ciao a tutti, Sono nuovo del NG. Ils permettent aussi de remonter sur une corde fixe. The Klemheist is easier to slide up than a Prusik. Slide and grip knot intended for a load in one direction only. Apr 29, 2023 · French climber Serge Machard (1) invented the autoblock knot in 1961. That, along with a prusik (look at a bachman hitch, might make it a tad easier than a prusik since its easier to move upwards) wont be too bad. 😱El nudo prusik es el único nudo de autobloqueo bidireccional. Apr 29, 2023 · Origine de l'Autoblock Le Français grimpeur Serge Machard (1) a inventé le nœud autobloquant en 1961. Machard utilisait le nœud The klemheist knot or French Machard knot is a type of friction hitch that grips the rope when weight is applied, and is free to move when the weight is released. The prusik knot is one of the most well-known hitches. ¡Es importante tener en cuenta estas diferencias al seleccionar el nudo adecuado para cada situación de escalada o montañismo! - Les nœuds d'assurage et de blocage (nœud de cabestan, demi-cabestan, noeud de Machard, nœud de Prusik) - Les nœuds de jonction (nœud de poing, tête d'alouette, nœud de pêcheur double) The knot requires a “Prusik Loop”. It is used similarly to a Prusik knot or the Bachmann knot to ascend or descend a climbing rope. Though different factors govern the length of the cord including its diameter and the height of the person using it, you can use 1. Uses: The principal use of a Prusik Knot is allowing a rope to be climbed – ascending or “ Prusiking “. Quel diametre de cordelette utilisez-vous et quelle longueur de cordelette vous faut-il pour faire un noeud autobloquant ? Personnellement j’ai des cordelettes de 5mm, 6mm et 8mm. Pour faire un prusik, il suffit de May 1, 2020 · The term Prusik knot or Autoblock is often used to generalise a number of different friction hitches that we use regularly in climbing. En général, on utilise également les nœuds autobloquants pour les remontées sur corde fixe et les opérations de Prusik vs Machard: Comparativa de dos nudos imprescindibles en deportes de montaña y de riesgo en el contexto de Análisis de productos de deportes de montaña y de riesgo. May 25, 2022 · The Prusik and French Machard are two types of auto-block knots that grip the rope when strong tension is applied: this allows you to safely rappel down on double ropes, preventing rope burns. - RWK9XT from Alamy's library of millions of high resolution stock photos, illustrations and vectors. This arrangement creates a strong grip in one direction Ideal for creating auto-blocking knots such as the Prusik and Machard, this loop offers you a quick and reliable solution. Certified EN566, the Jammy adapts safely to a multitude of activities. Sep 16, 2023 · Le Machard est un noeud sur corde tendue autobloquant inventé en 1961 par le grimpeur marseillais Serge Machard. Découvrez les plus importants en vidéo et vérifiez vos connaissances! Download this stock image: Forming an Autoblock knot (also called Machard or French Prusik) with a 5mm accessory cord around a 9. Cependant, après sa mort tragique dans un accident d'escalade en 1963, le club alpin local a baptisé le nouvel attelage à friction "nœud de Machard", ou "nœud de prusik" français. It comes in three different sizes: 35 cm, 50 cm, and 60 cm. On Apr 14, 2023 · Le nœud prusik est un outil polyvalent qui peut être utilisé dans divers scénarios, comme la descente en rappel. The term prusik describes the loop of the cord used to tie the hitch and the hitch itself. Prusik loop? The eye in eye cord is made for use with special friction hitches like the French Prusik (Valdotain Tresse). Sirve para escalada en roca y Prusíkův uzel na horolezeckém laně Machardův prusík Bachmannův prusík (s nebezpečně krátkými volnými konci) Prusíkův uzel, nebo zkráceně prusík, je označení pro speciální uzel, který je při uvolnění posuvný a při zatížení se utáhne (zadrhne). Edit: And as someone else mentioned, use a foot loop. Mar 13, 2024 · Machard, el gran aliado Machard: Al igual que con el prusik, el aprendizaje de este nudo es vital si pretendes introducirte en el mundo del barranquismo. Accrocher quelque chose su Nov 26, 2021 · Let's run through some fundamental friction hitches that every arborist would know, or at least should know. this video is about making different hitches. May 2, 2024 · Le noeud Machard Le Machard est un noeud d’ assurage en rappel. 5, corde simple 70 m) ? Feb 27, 2020 · Le Prusik et le Machard sont deux des nœuds autobloquants qui ont pour fonction de se resserrer autour de la corde lorsqu'elle est soumise à une forte tension. These knots are commonly used in climbing as part of single-rope technique, doubled-rope technique and as "ratchets" to capture progress on a moving rope, most typically in a mechanical advantage system such as a Z-drag. ” However, after his tragic passing in a climbing accident in 1963, the local Alpine club named the new friction hitch the Machard Knot, or the French prusik knot. Of course, to find out more about using it in the right context you may want to consider one of our Peak District National Park Climber’s Self-Rescue courses. Hay una gran variedad de ellos, según lo que necesitemos, pero los más populares son el Machard y el Prusik. The Prusik knot is easy to tie on the go, so it’s an obvious go-to climbing knot for professional climbers and enthusiasts. These friction hitches will help your progression if you're starting out in the industry. Soprattutto per chi inizia (chi è esperto ha già fatto le proprie valutazioni e decide di volta in volta se usare prusik, machard, machard bidirezionale o qualsiasi altro nodo) è bene non saturare la testa con troppe nozioni. 2 -1. Nœud de Prusik mobile. Il peut être remplacé par le Prussik (voir plus bas), qui remplit à peu près la même fonction, mais, sachant qu’il coulisse mieux, il est plus adapté à l’assurage d’un rappel. En este video, vamos a hablar de las diferencias entre tres nudos autobloqueantes muy populares: el nudo machard, el nudo machard doble asa y el nudo prusik. E’ un must learn per qualsiasi climber, è rapido e facile da realizzare e viene utilizzato in molteplici situazioni come la risalita di una corda, paranco, soccorso in crepaccio; ma la sua tipologia di impiego più diffusa è come autobloccante nella Jun 30, 2017 · Il Machard ha un funzionamento simile al prusik. Its flexible aramid cord with a polyamide sheath allows it to grip effectively even on small-diameter ropes. g; prusiking up a wet or icy rope), it’s better to use two different types of friction hitch (and a full strength back-up, of course). Il prusik, in particolare, ha la caratteristica di essere un bloccante Oct 24, 2023 · Français, prussik, Machard mais aussi valdôtain, polonais ou de Souabe, les nœuds autobloquants sont nombreux, trop nombreux. Cons of the Prusik Hitch: Harder to adjust and slide when not under load. Podemos usarlo para autoasegurarnos un rapel, como bloqueador durante un ascenso por cuerda, para montar un polipasto, etc… Mucho más maniobrables que el prusik en maniobras en las que deben ser movidos continuamente. The “VT”, Valdotain Tresse Knot is a friction knot used to ascend and descend on ropes. Addirittura c' qualcuno che non usa alcun nodo, ma non ho nemmeno perso THE MACHARD KNOT VARIANTS Many of my climbing friends, French and English as well have been using the Machard knot most often in its "French variant" and many also did not know its name, quite a number just named it a Prusik. Skládá se z dvakrát či vícekrát provlečené liščí smyčky z tenčí šňůry nebo popruhu navinutého kolem Sep 20, 2021 · Manual paso a paso de los Nudos de Escalada más importantes que debes aprender para poder realizar la mayoría de maniobras. Ventajas del nudo Machard Como verás en el video de abajo, el frenado se produce con la fricción entre . Apr 9, 2020 · Dans cet article, nous verrons comment choisir la cordelette (matière et diamètre) de l'anneau pour noeud autobloquant, et pour quel type de noeud opter (Machard ou Prusik) lors d'une course Sep 6, 2021 · A Prusik knot is a friction hitch used to grip a rope in climbing, canyoneering, mountaineering, caving, rope rescue, ziplining, and by arborists. Juts something to be aware of if searching for it on Google. Eseguito con una sola asola blocca in una sola direzione, con due asole è in grado di funzionare in entrambe le direzioni. At the time, Machard called his new invention the “spiral knot. [1][2] Nov 14, 2022 · El Prusik y el Machard son dos nudos autobloqueantes: veamos juntos similitudes y diferencias. The difference between the two being that The difference with the Klemheist (also called "Machard", or "French Prusik") compared to the normal Prusik is that it can be moved once weighted and will work with webbing as well as cord. Nœud de Prusik bloqué. In some contexts, prusik is also used as a verb. In this quick video tutorial we show you how to tie the Klemheist knot with clear step by step Často je Machardův uzel nazýván jako Klembheistův uzel nebo francouzský prusík, ale to je chyba, jde o záměnu dvou různých uzlů. Aug 13, 2004 · The main difference is that unlike the Prusik the Klemheist (or Machard) is meant to lock in one direction only. They’re designed to move freely on a line as you climb. The loop is wrapped several times around the main rope, with the tail passed through the bottom loop to secure the hitch. Réalisation : Formez une boucle avec la cordelette. • Advantages: Smooth and easy to adjust, locks effectively. An autoblock (or autobloc or "third hand") is a rope device used in climbing and caving for both rappelling (downward) and ascending (upward). The Machard Knot (Prusik Machard) The Machard knot is another autoblocking variant of the Prusik, often used for controlled rappelling. This could mean you’re connecting two separate ropes, which is common in rappelling scenarios, or you’re joining two ends of the same rope or cordelette to create a loop, which is used to create slings, Prusik knots, and countless other situations. More secure under varying loads than the Klemheist. Valdotain Tresse Knot Tying Instructions Make 4 wraps around main static rope with a hand tied or sewn prusik or spliced eye Demi-cabestan, nœud à huit, nœuds de Prusik, noeud de poing: Il y a beaucoup de nœuds en alpinisme. This does not seem to be what I find, mostly online the Machard is used as a synonym to the Klemheist. A diferencia del nudo prusik, es de autobloqueo unidireccional. Dec 17, 2015 · A prusik works in either direction, which is sometimes important. Son etapas de aprendizaje realizadas Nov 29, 2018 · Il nodo prusik, che appartiene alla categoria dei nodi "autobloccanti" (come il nodo machard), è molto utilizzato soprattutto in campo dell'arrampicata e alpinistico e del lavoro su fune e in El nudo Machard es un nudo de tipo autobloqueante. La tenue du nœud est meilleure avec une corde qu'avec une sangle 1. The Klemheist, or Machard Knot, is a derivative of the original Prusik knot. The Klemheist Prusik Knot Prohaska, Kreuzklemm, Klemheist, Prusik, Machard, Autoblock, Karabinerklemm, Bandklemm sind einige der Klemmknoten, die in Bergsteigerkreisen bekannt sind und mehr oder weniger oft ange-wendet werden. Scroll to see Animated Valdotain Tresse Knot below the illustration and tying instructions. Learn from our tying a French Prussik Knot video and that's one out of the way. Nudo para autorrescate. Le machard simple est bidirectionnel, alors que le français ne fonctionne que dans un sens. \bThere are are lots of crafty ways to use it that may be new to you, and also some common mistakes you want to avoid. These hitches are a simple and cheap alternative to mechanical ascenders. En caso se realizara en el sentido opuesto el nudo se desarmaría y no frenaría. Nudo Elaboración de los diferentes nudos: Sobre una cuerda, Machard, Prusik y Swicero. Et si les idées de monsieur Prusik étaient abjectes, son nœud, lui, a changé la pratique de l Le Machard Le Machard, ou prusik français, est apprécié pour sa facilité de coulissement lorsqu'il n'est pas sous tension, tout en offrant une excellente sécurité. How to Tie a Prusik Knot You will have to make the cord loop with a double fisherman’s knot or a triple fisherman’s knot before starting off with the tying procedure. In this quick video tutorial we show you how to tie the Klemheist knot with clear step by step The Klemheist knot, also known as the Machard knot can be used to ascend or descend a climbing line. J’ai juste essaye celle de 8mm (qui doit mesurer 1m50) et elle bloque beaucoup trop. Sep 18, 2023 · En resumen, tanto el nudo Prusik como el nudo Machard son herramientas valiosas en actividades relacionadas con cuerdas. Note also an "emergency" variant that you can do with a single cord, the "single loop Machard" similar to the Valdotain knot. ) Friction hitches are used typically used as a rope grab in a mechanical advantage haul system, and as a tool for emergency rope ascending. Este video no pretende ser un tutorial. Suggested Cordage Size: 10mm on 11-13mm host line. Machard used the autoblock knot for ascending May 25, 2022 · The Prusik and French Machard are two types of auto-block knots that grip the rope when strong tension is applied: this allows you to safely rappel down on double ropes, preventing rope burns. Les nœuds de Machard sont une famille de nœuds autobloquants utilisés en escalade, en alpinisme, en spéléologie et par certains cordistes pour réaliser un ancrage sur une corde. With one or two prusiks you can ascend a rope, or rig a z-pulley to haul up an injured climber, or backup an abseil (“abseil” is aka “rappel”). Klemheist Knot Pros of the Prusik Hitch: Provides bi-directional gripping, making it ideal for applications where the rope might be loaded from multiple angles. Vi espongo un dubbio che ho da tempo: per le calate in doppia, quale nodo di sicurezza migliore? Il Prusik o il Machard? Conosco persone che utilizzano entrambi i nodi, e ognuno dice che meglio quello che usa (naturalmente :), ma nessuno stato in grado di darmi una spiegazione convincente. Another Afaik prusik should be used only if traction on both ends of the rope is equal; otherwise use machard *The Klemheist or Machard hitch* The Klemheist or Machard hitch also grabs in one direction and is often used to climb with the secured foot-lock technique. You can also use auto-block knots for fixed-line ascents and emergency operations, tying the cord around the rope and securing it to your harness with a carabiner Nudos autobloqueantes El diámetro y el tipo de cordino, utilizados para realizar un nudo autobloqueante, se deben escoger en función de la cuerda sobre la que será utilizado. • Use: Controlled descent, progression on rope. There's three friction knots every climber should know. Se trata de otro nudo muy popular en cualquiera de sus versiones (machard unidireccional y machard bidireccional). Découvrez les différents noeuds autobloquants pour cordes de rappel : Prussik, Schwabisch, nœud de Blake, Machard, Valdotain, Distel ou encore Knut. The klemheist is Klemheist Description The Klemheist knot or Machard knot is a type of friction hitch that grips the rope when weight is applied, and is free to move when the weight is released. I have shown hitches like machard, Blake's hitch, Klemheist, Bachmann and prusik hitch. Vertical caving terminology and methods > Knots > Common knots Prusik knot (pronounced "PRUH-sik", even though it should be "PROO-sik"), Gérard hitch, Hedden knot, kreutzklem knot, klemheist knot, inverted Hedden knot, French Machard knot, Bachmann knot, Bachmann hitch, autoblock knot, Machard knot, French prusik knot, Schwabisch hitch, Distel hitch, Valdôtain tresse, Valdôtain tresse XT 🚵‍♀️🧗‍♂️🏄🪂🏂🚣‍♀️Le nœud autobloquant Machard mode simple ou bidirectionnel, français ou tressé ainsi que le Pruski ou Prussik. Check out my channel for more hitch how-to videos and much, m Oct 3, 2017 · Machard Cada vez más utilizado en cualquiera de sus dos versiones, es sin lugar a dudas uno de los autobloqueantes más práctico y funcional. Jul 20, 2024 · The Klemheist is one of three friction hitches every climber ought to know. If you were using a klemheist, you would only be safe falling in one direction or the other. Enroulez la boucle autour de la corde principale plusieurs fois (trois à cinq tours). The BEAL Jammy is designed to fit all rope diameters, on one strand or two. In primis si usa il machard per sicurezza sulle doppie ed il prusik per le risalite d'emergenza su corde. Le plus ancien utilisé est sans doute le prussik, du nom de Karl Prusik qui l’a popularisé dans le monde de l’alpinisme entre deux défilés militaires nazis. Learn all about the Tibloc, starting with how to properly pronounce it! Quelle corde pour un Machard ? CORDELETTES DE DIAMETRE 6 ET 7 MM Elles serviront à confectionner un Prussik ou un Machard, c'est à dire un noeud de contre assurage en rappel, ou bien pour réaliser un relais. À l'époque, Machard appelait sa nouvelle invention le "nœud spiralé". This one is simple. Se utilizan como bloqueamore Prohaska, Kreuzklemm, Klemheist, Prusik, Machard, Autoblock, Karabinerklemm, Bandklemm sind einige der Klemmknoten, die in Bergsteigerkreisen bekannt sind und mehr oder weniger oft angewendet werden. Sep 15, 2024 · 4. The Schwabisch (pronounced "sway-bish") is known to hold securely and grips reliably after descent. - If using prusiks in conditions where they might fail (e. There are May 7, 2019 · Il Prusik e il Machard sono due nodi autobloccanti che svolgono la funzione di stringersi intorno alla corda nel momento in cui vengono sottoposti a forte tensione; puoi quindi usarli come sicurezza aggiuntiva nelle discese in corda doppia, per allestire soste mobili o per assicurare il compagno di cordata in ambito alpinistico. L'utilisation de sangles telles que celles de la photo est déconseillée, car une sangle supporte mal la friction et a un point de fusion plus faible qu'une corde. Nœud de Machard simple (autour de la corde), réalisé avec un anneau de cordelette reliée par un nœud de pêcheur double (à gauche) et les boucles prises dans un mousqueton Nœud de Machard français. This can be very handy in certain situations. Replied by TreeTramp on topic Re:Eyed Prusik cord vs. Eso quiere decir que solo se frena en cuando se ejerce tensión por un solo solo sentido. • Disadvantages: Less effective on worn or wet ropes. Follow these steps to tie a Klemheist: Step 1: Simply wrap a loop of cord around the rope several times. Klemheist Knot. Salut, Je voudrais faire un anneau avec une cordelette pour faire un noeud de machard ou prusik. 8mm climbing rope. (The other two are the prusik and the autoblock, aka French prusik, or Machard. Jul 10, 2025 · Pour le machard, on mousquetonne les deux boucles de la cordelette, alors que pour le français, la boucle du bas passe dans celle du haut puis se mousquetonne. Prusik Der Prusik ist uns allen geläufig, doch ist er wirklich der beste Klemmknoten? Ein Plädoyer für den eleganten FB-Klemmknoten. Nov 29, 2017 · Nudo Machard En toda actividad que utiliza cuerdas y nudos, considero que es imprescindible conocer los que te puedan ayudar a salir de apuros, con maniobras de fortuna para realizar autorescate o el rescate de un compañero, por ese motivo he incluido el machard que por estrangulamiento bloquea la cuerda. 5 m length of a 5 mm cord on most of the thicker varieties of ropes. Otros nudos, como el machard o prohaska, son unidireccionales. It releases more easily then the Prusik Nov 11, 2023 · In this illustarted guide, we teach you how to tie a Klemheist Knot, tell you what situations it's good for, and compare it with other friction hitches. Klemheist Description The Klemheist knot or Machard knot is a type of friction hitch that grips the rope when weight is applied, and is free to move when the weight is released. tgwg tzge ufp cbnid jwcvvif mwdgl doaax czln ixgh kwbv