{"id":59874,"date":"2020-12-28T19:03:41","date_gmt":"2020-12-28T18:03:41","guid":{"rendered":"https:\/\/woodboard.at\/twintips-avec-des-proprietes-de-foil\/"},"modified":"2021-04-23T21:28:02","modified_gmt":"2021-04-23T19:28:02","slug":"twintips-avec-des-proprietes-de-foil","status":"publish","type":"post","link":"https:\/\/woodboard.at\/fr\/twintips-avec-des-proprietes-de-foil\/","title":{"rendered":"Twintips avec des propri\u00e9t\u00e9s de foil"},"content":{"rendered":"<p><span style=\"font-weight: 400\">Si nous regardons les principes physiques du foiling, nous arrivons rapidement \u00e0 l&rsquo;\u00e9quation de Bernoulli. Bernoulli \u00e9tait un physicien suisse qui a d\u00e9fini les principes fondamentaux de la m\u00e9canique des fluides au 18e si\u00e8cle. Venturi a continu\u00e9 \u00e0 d\u00e9velopper les travaux de Bernoulli, c&rsquo;est pourquoi, on utilise souvent le nom d&rsquo;effet Venturi.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-large wp-image-58343\" src=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Bernoulli-1024x1024.jpg\" alt=\"\" width=\"1024\" height=\"1024\" srcset=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Bernoulli-980x980.jpg 980w, https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Bernoulli-480x480.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/p>\n<p><span style=\"font-weight: 400\">Essentiellement, l&rsquo;\u00e9quation de Bernoulli indique que l&rsquo;\u00e9nergie sp\u00e9cifique le long d&rsquo;un filament d&rsquo;\u00e9coulement est toujours constante. Cette \u00e9nergie se compose de l&rsquo;\u00e9nergie de pression, de l&rsquo;\u00e9nergie cin\u00e9tique et de l\u2019\u00e9nergie statique. Bernoulli a \u00e9galement d\u00e9couvert que les fluides &#8211; lorsqu&rsquo;ils traversent un r\u00e9tr\u00e9cissement &#8211; sont acc\u00e9l\u00e9r\u00e9s.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Cela signifie que la pression est plus \u00e9lev\u00e9e dans le d\u00e9bit lent et moins \u00e9lev\u00e9e dans les zones \u00e0 d\u00e9bit plus rapide.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-large wp-image-58408\" src=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Flugel-Englisch-1024x453.jpg\" alt=\"\" width=\"1024\" height=\"453\" srcset=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Flugel-Englisch-980x434.jpg 980w, https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Flugel-Englisch-480x212.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/p>\n<p><span style=\"font-weight: 400\">Cet effet permet aux avions de voler d\u00fb au fait que le flux d\u2019air s&rsquo;acc\u00e9l\u00e8re au sommet de l&rsquo;aile, la pression sur le c\u00f4t\u00e9 sup\u00e9rieur de l&rsquo;aile diminue et la pression ambiante en dessous de l\u2019aile porte alors l\u2019avion.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Il en va de m\u00eame pour les ailes des foils, qui fonctionnent comme les ailes d&rsquo;un avion.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Les ing\u00e9nieurs de Woodboard ont appliqu\u00e9 ce principe pour construire leurs planches de freeride.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Seulement, le flux n&rsquo;est pas guid\u00e9 et acc\u00e9l\u00e9r\u00e9 par une aile, mais est guid\u00e9 \u00e0 travers un canal (channel) qui se r\u00e9tr\u00e9cit le long de l\u2019outline de la planche vers les car\u00e8nes.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Dans ce canal, le d\u00e9bit est acc\u00e9l\u00e9r\u00e9, la pression diminue et la pression ambiante en dessous aide \u00e0 soulever la planche.<\/span><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-large wp-image-58410\" src=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Board-Englisch-1024x526.jpg\" alt=\"\" width=\"1024\" height=\"526\" srcset=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Board-Englisch-980x503.jpg 980w, https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Board-Englisch-480x247.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/p>\n<p><span style=\"font-weight: 400\">Si on utilise maintenant des donn\u00e9es de navigation normale avec l&rsquo;\u00e9quation de Bernoulli, cela donne une force de flottabilit\u00e9 suppl\u00e9mentaire d&rsquo;environ 1 \u00e0 2 Newtons, ce qui \u00e9quivaut \u00e0 10 \u00e0 20 kilos de pouss\u00e9e.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Cela signifie que si le kiter p\u00e8se 80 kilos, l&rsquo;aile n&rsquo;a plus qu&rsquo;\u00e0 tracter 60 \u00e0 70 kilos.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Et c&rsquo;est la raison de l&rsquo;incroyable planning des planches CRBN et CHAME, les tr\u00e8s bonnes performances de remont\u00e9e au vent et g\u00e9n\u00e9ralement la sensation de libert\u00e9 et de contr\u00f4le de la planche.<\/span><\/p>\n<p><span style=\"font-weight: 400\">L&rsquo;effet peut \u00e9galement \u00eatre observ\u00e9 lors de simulation d\u2019\u00e9coulement de l\u2019eau sur ordinateur. Alors que la vitesse \u00e0 l&rsquo;entr\u00e9e est de 6 n\u0153uds (vert), elle atteint 9 n\u0153uds (jaune) \u00e0 la sortie.<\/span><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-large wp-image-58322\" src=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/CRBN-Spray6-1024x400.jpg\" alt=\"\" width=\"1024\" height=\"400\" srcset=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/CRBN-Spray6-1024x400.jpg 1024w, https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/CRBN-Spray6-980x383.jpg 980w, https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/CRBN-Spray6-480x187.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/p>\n<p><span style=\"font-weight: 400\">Voici encore un aper\u00e7u :<\/span><\/p>\n<p><span style=\"font-weight: 400\">Sensation de glisse, twintip \u00ab\u00a0normal\u00a0\u00bb<\/span><\/p>\n<p><span style=\"font-weight: 400\">Lorsque l\u2019\u00e9coulement de l\u2019eau atteint un plan inclin\u00e9, la force r\u00e9sultante est divis\u00e9e en 2 composantes : la force de flottabilit\u00e9 et la force de propulsion. Si la force de flottabilit\u00e9 est sup\u00e9rieure au poids du rider, la planche glisse. La force r\u00e9sultante pointe alors vers le haut !<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-59891\" src=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Krafte-normales-Board-Englisch.jpg\" alt=\"\" width=\"761\" height=\"349\" srcset=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Krafte-normales-Board-Englisch.jpg 761w, https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Krafte-normales-Board-Englisch-480x220.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 761px, 100vw\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400\">La sensation de glisse avec le principe Bernoulli-Venturi<\/span><\/p>\n<p><span style=\"font-weight: 400\">En plus de la relation illustr\u00e9e ci-dessus, avec les planches Freeride CRBN et CHAME de Woodboard, le flux dans les channels sous la planche qui se r\u00e9tr\u00e9cit vers la pointe est acc\u00e9l\u00e9r\u00e9, ce qui r\u00e9duit la pression et la pression ambiante plus \u00e9lev\u00e9e en dessous g\u00e9n\u00e8re une force de flottabilit\u00e9 suppl\u00e9mentaire.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-59892\" src=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Krafte-bernulli-Englisch.jpg\" alt=\"\" width=\"761\" height=\"349\" srcset=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Krafte-bernulli-Englisch.jpg 761w, https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Krafte-bernulli-Englisch-480x220.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 761px, 100vw\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400\">Si on compare maintenant la flottabilit\u00e9 n\u00e9cessaire d&rsquo;une planche \u00ab\u00a0normale\u00a0\u00bb avec une planche avec des Venturi channels, on peut donc voir que la planche avec des channels Venturi en n\u00e9cessite moins.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-large wp-image-58416\" src=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Kraft-Vergleich-englisch-1024x268.jpg\" alt=\"\" width=\"1024\" height=\"268\" srcset=\"https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Kraft-Vergleich-englisch-1024x268.jpg 1024w, https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Kraft-Vergleich-englisch-980x256.jpg 980w, https:\/\/woodboard.at\/wp-content\/uploads\/2020\/12\/Zeichnung-Kraft-Vergleich-englisch-480x126.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/p>\n<p><span style=\"font-weight: 400\">Cela conduit au fait que vous glissez donc mieux par vent l\u00e9ger, que vous sauterez plus haut et que vous aurez plus de souplesse et de contr\u00f4le au bout de vos pieds. La vitesse est plus \u00e9lev\u00e9e car moins de force est requise en tant que force de portance et plus est convertie en propulsion.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Daniel Bernoulli \u00e9tait un physicien et math\u00e9maticien suisse qui a explor\u00e9 les bases du m\u00e9canisme d&rsquo;\u00e9coulement avec l&rsquo;\u00e9quation de Bernoulli au 18\u00e8me si\u00e8cle.<\/p>\n","protected":false},"author":127,"featured_media":59881,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[136],"tags":[],"class_list":["post-59874","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-information-fr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Twintips avec des propri\u00e9t\u00e9s de foil - Woodboard Kitesurfing<\/title>\n<meta name=\"description\" content=\"Daniel Bernoulli \u00e9tait un physicien et math\u00e9maticien suisse qui a explor\u00e9 les bases du m\u00e9canisme d&#039;\u00e9coulement avec l&#039;\u00e9quation de Bernoulli au 18\u00e8me si\u00e8cle.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/woodboard.at\/fr\/twintips-avec-des-proprietes-de-foil\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Twintips avec des propri\u00e9t\u00e9s de foil - 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