{"id":1686,"date":"2015-02-11T13:06:32","date_gmt":"2015-02-11T12:06:32","guid":{"rendered":"http:\/\/www.culturalusa.com\/news\/?p=1686"},"modified":"2015-02-11T13:08:09","modified_gmt":"2015-02-11T12:08:09","slug":"leurope-veut-lancer-son-prototype-davion-spatial","status":"publish","type":"post","link":"https:\/\/www.culturalusa.com\/news\/technologie\/leurope-veut-lancer-son-prototype-davion-spatial\/","title":{"rendered":"L&rsquo;Europe veut lancer son prototype d&rsquo;avion spatial"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.culturalusa.com\/news\/wp-content\/uploads\/2015\/02\/prototype-avion-spatial.jpg\" alt=\"prototype avion spatial\" width=\"460\" height=\"235\" class=\"aligncenter size-full wp-image-1687\" \/>Cet avion a la taille d&rsquo;une voiture et il est d\u00e9pourvu d&rsquo;ailes mais il entend bien voler comme un avion: le prototype de v\u00e9hicule spatial europ\u00e9en IXV devait \u00eatre lanc\u00e9 mercredi pour tester sa rentr\u00e9e contr\u00f4l\u00e9e dans l&rsquo;atmosph\u00e8re, une technologie clef qui manque encore \u00e0 l&rsquo;Europe spatiale.<\/p>\n<p>Les Etats-Unis et la Russie la ma\u00eetrisent depuis longtemps. Elle est n\u00e9cessaire pour concevoir des engins aptes \u00e0 revenir sur Terre et r\u00e9utilisables.<\/p>\n<p>Baptis\u00e9 IXV (Intermediate eXp\u00e9rimental Vehicle), le prototype, non habit\u00e9, mesure cinq m\u00e8tres de long et p\u00e8se environ deux tonnes.<\/p>\n<p>Il est install\u00e9 au sommet d&rsquo;une fus\u00e9e europ\u00e9enne Vega qui doit \u00eatre tir\u00e9e \u00e0 13H00 GMT (14H00 heure de Paris) depuis le port spatial de Kourou (Guyane fran\u00e7aise).<\/p>\n<p>Le co\u00fbt du projet, port\u00e9 par l&rsquo;Agence spatiale europ\u00e9enne (ESA), est de 170 millions d&rsquo;euros. Sept pays participent au financement: la Belgique, l&rsquo;Espagne, la France, l&rsquo;Irlande, l&rsquo;Italie, le Portugal et la Suisse.<\/p>\n<p>La mission du v\u00e9hicule exp\u00e9rimental sera courte: cent minutes. IXV se s\u00e9parera du lanceur 18 minutes apr\u00e8s le tir, \u00e0 environ 340 km de la Terre. Il montera jusqu&rsquo;\u00e0 une hauteur de 420 km puis entamera sa descente.<\/p>\n<p>A 120 km, il rentrera dans l&rsquo;atmosph\u00e8re \u00e0 la vitesse tr\u00e8s \u00e9lev\u00e9e de 7,5 km par seconde (27.000 km\/h). Le frottement avec l&rsquo;air ralentira le vaisseau. <\/p>\n<p>Son fuselage a\u00e9rodynamique le portera, lui permettant de voler bri\u00e8vement avant qu&rsquo;un parachute multi-\u00e9tages ne s&rsquo;ouvre et que IXV plonge \u00e0 un point pr\u00e9cis dans l&rsquo;Oc\u00e9an Pacifique, loin de toute zone habit\u00e9e. Des ballons g\u00e9ants le maintiendront \u00e0 flots et un bateau viendra le r\u00e9cup\u00e9rer.<\/p>\n<p>\u00ab\u00a0Le retour d&rsquo;orbite est une des disciplines les plus difficiles \u00e0 r\u00e9aliser dans le domaine du spatial\u00a0\u00bb, selon Giorgio Tumino, responsable du programme IXV \u00e0 l&rsquo;ESA.<\/p>\n<p>Si l&rsquo;angle de rentr\u00e9e est trop important, le vaisseau risque de br\u00fbler. S&rsquo;il est trop faible, IXV risque de ne pas atteindre le point fix\u00e9 pour son retour sur Terre.<\/p>\n<p>\u00ab\u00a0L&rsquo;Europe excelle \u00e0 mettre des satellites en orbite. Nous avons aussi un bon savoir-faire pour r\u00e9aliser des amarrages\u00a0\u00bb, comme l&rsquo;a montr\u00e9 le cargo ATV. Mais nous sommes derri\u00e8re les Am\u00e9ricains, les Russes et m\u00eame les Chinois en mati\u00e8re de rentr\u00e9e dans l&rsquo;atmosph\u00e8re\u00a0\u00bb, reconna\u00eet M. Tumino.<\/p>\n<p>Les Am\u00e9ricains ont fait voler pendant trente ans leur navette spatiale avant de l&rsquo;abandonner en 2011.<\/p>\n<p>Actuellement, les Russes sont les seuls \u00e0 pouvoir effectuer des retours sur Terre d&rsquo;astronautes gr\u00e2ce aux capsules Soyouz.<\/p>\n<p>Le module Dragon de la soci\u00e9t\u00e9 am\u00e9ricaine SpaceX permet de ramener du fret. Et la Nasa a lanc\u00e9 avec succ\u00e8s, en d\u00e9cembre, son v\u00e9hicule exp\u00e9rimental Orion dont la capsule a effectu\u00e9 sans probl\u00e8me son retour sur Terre. Ce nouveau vaisseau d&rsquo;exploration spatiale aura notamment pour mission de transporter des astronautes vers Mars.<\/p>\n<p>Dans les ann\u00e9es 1980, la France puis l&rsquo;Europe avaient pr\u00e9par\u00e9 un ambitieux projet d&rsquo;avion spatial Herm\u00e8s destin\u00e9 \u00e0 transporter des astronautes. Mais il a \u00e9t\u00e9 abandonn\u00e9 en 1993.<\/p>\n<p>Les premi\u00e8res \u00e9tudes de faisabilit\u00e9 du IXV, projet beaucoup plus modeste, ont \u00e9t\u00e9 lanc\u00e9es en 2006 et l&rsquo;appareil est d\u00e9velopp\u00e9 depuis 2009.<\/p>\n<p>\u00ab\u00a0L&rsquo;Europe a choisi une voie m\u00e9diane entre les capsules, qui sont simples mais pas manoeuvrables \u00e0 l&rsquo;atterrissage et les v\u00e9hicules avec des ailes, tr\u00e8s manoeuvrables mais tr\u00e8s complexes et co\u00fbteux\u00a0\u00bb, souligne M. Tumino.<\/p>\n<p>Con\u00e7u sous la ma\u00eetrise d&rsquo;oeuvre de Thales Alenia Space, \u00e0 la t\u00eate d&rsquo;un consortium d&rsquo;une quarantaine de soci\u00e9t\u00e9s europ\u00e9ennes, IXV est \u00e9quip\u00e9 de plus de 300 capteurs pour recueillir une masse de donn\u00e9es sur le vol.<\/p>\n<p>Si la mission IXV se passe bien, l&rsquo;Europe aura franchi \u00ab\u00a0un pas fondamental\u00a0\u00bb en direction de trois possibilit\u00e9s \u00e0 long terme: \u00ab\u00a0Les lanceurs r\u00e9utilisables, le retour d&rsquo;\u00e9chantillons de l&rsquo;espace et le retour d&rsquo;astronautes sur Terre\u00a0\u00bb, rel\u00e8ve M. Tumino.<\/p>\n<p>\u00ab\u00a0Ce sont des enjeux de souverainet\u00e9 pour l&rsquo;Europe et la France\u00a0\u00bb, souligne Genevi\u00e8ve Fioraso, la secr\u00e9taire d&rsquo;Etat fran\u00e7aise \u00e0 la Recherche qui sera avec son homologue italienne Stefania Giannini au Centre de contr\u00f4le de la mission \u00e0 Turin pour le lancement du prototype. (AFP)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cet avion a la taille d&rsquo;une voiture et il est d\u00e9pourvu d&rsquo;ailes mais il entend bien voler comme un avion: le prototype de v\u00e9hicule spatial europ\u00e9en IXV devait \u00eatre lanc\u00e9 mercredi pour tester sa rentr\u00e9e contr\u00f4l\u00e9e dans l&rsquo;atmosph\u00e8re, une technologie clef qui manque encore \u00e0 l&rsquo;Europe spatiale. Les Etats-Unis et la Russie la ma\u00eetrisent depuis [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[155,154],"class_list":["post-1686","post","type-post","status-publish","format-standard","hentry","category-technologie","tag-avion-spatial","tag-prototype"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Cet avion a la taille d&#039;une voiture et il est d\u00e9pourvu d&#039;ailes mais il entend bien voler comme un avion: le prototype de v\u00e9hicule spatial europ\u00e9en IXV devait \u00eatre lanc\u00e9 mercredi pour tester sa rentr\u00e9e contr\u00f4l\u00e9e dans l&#039;atmosph\u00e8re, une technologie clef qui manque encore \u00e0 l&#039;Europe spatiale. 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