{"id":1897,"date":"2025-08-14T11:12:41","date_gmt":"2025-08-14T09:12:41","guid":{"rendered":"https:\/\/acriv.org\/WP\/?page_id=1897"},"modified":"2025-08-14T11:12:41","modified_gmt":"2025-08-14T09:12:41","slug":"%e2%9a%99%ef%b8%8fbille-indicateur-de-virage","status":"publish","type":"page","link":"https:\/\/acriv.org\/WP\/%e2%9a%99%ef%b8%8fbille-indicateur-de-virage\/","title":{"rendered":"\u2699\ufe0fBILLE &#8211; INDICATEUR DE VIRAGE"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"225\" height=\"225\" src=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-57.png\" alt=\"\" class=\"wp-image-1898\" style=\"width:234px;height:auto\" srcset=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-57.png 225w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-57-150x150.png 150w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-57-105x105.png 105w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/figure>\n<\/div>\n\n\n<p>La <strong>bille-aiguille<\/strong> (ou <em>turn and slip indicator<\/em>) et l\u2019<strong>indicateur de virage<\/strong> (<em>turn coordinator<\/em> ou <em>turn indicator<\/em>) sont des instruments qui aident le pilote \u00e0 contr\u00f4ler <strong>l\u2019inclinaison et la coordination du virage<\/strong>.<br>Ils sont souvent combin\u00e9s dans un m\u00eame bo\u00eetier sur les avions l\u00e9gers.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. <strong>Deux parties distinctes<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">a) <strong>L\u2019aiguille<\/strong> (ou mini-avion)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fonction<\/strong> : indique la <strong>vitesse angulaire de virage<\/strong> (taux de rotation en lacet autour de l\u2019axe vertical).<\/li>\n\n\n\n<li><strong>Principe m\u00e9canique<\/strong> :\n<ul class=\"wp-block-list\">\n<li>Un petit gyroscope mont\u00e9 horizontalement d\u00e9tecte la vitesse de rotation.<\/li>\n\n\n\n<li>L\u2019inclinaison de l\u2019aiguille ou du symbole d\u2019avion indique si le virage est \u00e0 gauche ou \u00e0 droite, et si le taux correspond \u00e0 un <strong>virage standard<\/strong> (<em>standard rate turn<\/em> = 3\u00b0\/seconde, soit un tour complet en 2 minutes).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Lecture<\/strong> :\n<ul class=\"wp-block-list\">\n<li>Aiguille centr\u00e9e \u2192 pas de virage (ou virage tr\u00e8s faible).<\/li>\n\n\n\n<li>Aiguille align\u00e9e avec la marque \u2192 virage standard.<\/li>\n\n\n\n<li>Plus loin \u2192 virage plus serr\u00e9.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">b) <strong>La bille<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fonction<\/strong> : indique si le virage est <strong>coordonn\u00e9<\/strong>, <strong>gliss\u00e9<\/strong> ou <strong>d\u00e9rap\u00e9<\/strong>.<\/li>\n\n\n\n<li><strong>Principe physique<\/strong> :\n<ul class=\"wp-block-list\">\n<li>Une petite bille dans un tube incurv\u00e9 rempli de liquide agit comme un niveau \u00e0 bulle, sensible \u00e0 la force centrifuge et \u00e0 la gravit\u00e9.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Lecture<\/strong> :\n<ul class=\"wp-block-list\">\n<li><strong>Bille centr\u00e9e<\/strong> \u2192 virage coordonn\u00e9 (inclin\u00e9e + lacet \u00e9quilibr\u00e9s).<\/li>\n\n\n\n<li><strong>Bille \u00e0 l\u2019int\u00e9rieur du virage<\/strong> \u2192 avion en glissade (<em>slip<\/em>) \u2192 pas assez de pied.<\/li>\n\n\n\n<li><strong>Bille \u00e0 l\u2019ext\u00e9rieur du virage<\/strong> \u2192 avion en d\u00e9rapage (<em>skid<\/em>) \u2192 trop de pied.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. <strong>Diff\u00e9rence entre indicateur de virage et turn coordinator<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Indicateur de virage<\/strong> : aiguille r\u00e9agit uniquement au mouvement de lacet (axe vertical).<\/li>\n\n\n\n<li><strong>Turn coordinator<\/strong> : gyroscope inclin\u00e9 \u00e0 30\u00b0 qui d\u00e9tecte \u00e0 la fois le lacet et une partie du roulis \u2192 plus r\u00e9actif et intuitif pour les d\u00e9buts du virage.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. <strong>Utilit\u00e9 en vol<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Permet de faire des virages <strong>pr\u00e9cis et coordonn\u00e9s<\/strong>, m\u00eame sans rep\u00e8res visuels ext\u00e9rieurs.<\/li>\n\n\n\n<li>Instrument de secours si l\u2019horizon artificiel tombe en panne.<\/li>\n\n\n\n<li>Indispensable en <strong>vol sans visibilit\u00e9<\/strong> (IFR) pour \u00e9viter la d\u00e9sorientation.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"805\" height=\"506\" src=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-58.png\" alt=\"\" class=\"wp-image-1899\" style=\"width:510px;height:auto\" srcset=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-58.png 805w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-58-300x189.png 300w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-58-768x483.png 768w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-58-800x503.png 800w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-58-320x202.png 320w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-58-700x441.png 700w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-58-477x300.png 477w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-58-310x195.png 310w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-58-150x94.png 150w\" sizes=\"auto, (max-width: 805px) 100vw, 805px\" \/><\/figure>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83d\udccc <strong>Astuce mn\u00e9motechnique<\/strong> pour la bille :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><em>\u201cPied du c\u00f4t\u00e9 o\u00f9 va la bille\u201d<\/em><br>Si la bille s\u2019\u00e9carte, on applique du palonnier dans cette direction pour la recentrer.<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>La bille-aiguille (ou turn and slip indicator) et l\u2019indicateur de virage (turn coordinator ou turn indicator) sont des instruments qui aident le pilote \u00e0 contr\u00f4ler l\u2019inclinaison et la coordination du virage.Ils sont souvent combin\u00e9s dans un m\u00eame bo\u00eetier sur les avions l\u00e9gers. 1. Deux parties distinctes a) L\u2019aiguille (ou mini-avion) b) La bille 2. Diff\u00e9rence entre indicateur de virage et<\/p>\n<p><a class=\"more-link\" href=\"https:\/\/acriv.org\/WP\/%e2%9a%99%ef%b8%8fbille-indicateur-de-virage\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1897","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/pages\/1897","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/comments?post=1897"}],"version-history":[{"count":1,"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/pages\/1897\/revisions"}],"predecessor-version":[{"id":1900,"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/pages\/1897\/revisions\/1900"}],"wp:attachment":[{"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/media?parent=1897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}