{"id":7991,"date":"2024-05-05T20:28:46","date_gmt":"2024-05-05T12:28:46","guid":{"rendered":"https:\/\/tommykwan.com\/blog\/?p=7991"},"modified":"2024-05-05T21:07:30","modified_gmt":"2024-05-05T13:07:30","slug":"errors-on-gyroscope-instrument-wander-real-wander-total-apparent-wander","status":"publish","type":"post","link":"https:\/\/tommykwan.com\/blog\/aviation\/errors-on-gyroscope-instrument-wander-real-wander-total-apparent-wander\/","title":{"rendered":"Errors on gyroscope instrument &#8211; Wander = Real Wander + Total apparent Wander"},"content":{"rendered":"<p style=\"text-align: center;\"><span style=\"color: #ff0000;\"><strong>&#8220;Wander&#8221;<\/strong><\/span> &#8211; describe the situation when the<span style=\"color: #ff0000;\"><strong> gyroscope&#8217;s spin axis away from its fixed direction<\/strong><\/span> (reference datum)<\/p>\n<p>Due to its rigidity, the spin axis of a perfect gyro should continue to point in a fixed direction. Any movement of the spin axis away from this fixed direction is known as gyro wander. Depending on the direction in which the spin axis moves, the gyro may be said to be drifting or toppling.<\/p>\n<div class='gallery'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/tommykwan.com\/blog\/aviation\/errors-on-gyroscope-instrument-wander-real-wander-total-apparent-wander\/attachment\/topple\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/05\/topple-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/tommykwan.com\/blog\/aviation\/errors-on-gyroscope-instrument-wander-real-wander-total-apparent-wander\/attachment\/topple-vs-drift\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/05\/Topple-vs-Drift-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl>\n\t\t\t<br style='clear: both' \/>\n\t\t<\/div>\n\n<p>Ref <a href=\"https:\/\/issuu.com\/bristolgs\/docs\/022a_inst_atpl_a__v6.1.5_ch_3_gyros\">https:\/\/issuu.com\/bristolgs\/docs\/022a_inst_atpl_a__v6.1.5_ch_3_gyros<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7998\" src=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/05\/Gyro-Wander-1.png\" alt=\"\" width=\"624\" height=\"510\" srcset=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/05\/Gyro-Wander-1.png 624w, https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/05\/Gyro-Wander-1-300x245.png 300w\" sizes=\"auto, (max-width: 624px) 100vw, 624px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><strong>Wander = Real Wander + Total apparent Wander<\/strong><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #ff0000;\"><strong>Wander = Real Wander + earth rotation + transport wander<\/strong><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\">Real Wander<\/span><\/p>\n<div class=\"embed-container\"><iframe loading=\"lazy\" title=\"Gyroscope Wander\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/3l1yM7aTwFg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\">Apparent wander &#8211; due to earth rotation<\/span><\/p>\n<p>Apparent wander appear on <a href=\"https:\/\/tommykwan.com\/blog\/aviation\/whats-gimbal-in-gyroscope-instrument\/\">tied gyro<\/a> in lieu of <a href=\"https:\/\/tommykwan.com\/blog\/aviation\/whats-gimbal-in-gyroscope-instrument\/\">earth gyro<\/a>~<\/p>\n<p><strong>IMPORTANT : \u540c\u6642\u89e3\u91cb\u4e86\u9ede\u89e3 apparent wander appears on HI (a.k.a DI) in lieu of\u00a0 AH!<\/strong><\/p>\n<p>This is also the reason why HI (DI) need to realign periodically.<\/p>\n<div class=\"embed-container\"><iframe loading=\"lazy\" title=\"Earth Rotation\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/9XK4ywc9vN8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\">Apparent wander &#8211; due to movement of the gyroscope (aircraft) &#8211; i.e the transport wander<\/span><\/p>\n<div class=\"embed-container\"><iframe loading=\"lazy\" title=\"Transport Wander\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/LZbFKcqhAMQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;Wander&#8221; &#8211; describe the situation when the gyroscope&#8217;s spin axis away from its fixed direction (reference datum) Due to its rigidity, the spin axis of a perfect gyro should continue to point in a fixed direction. Any movement of the spin axis away from this fixed direction is known as gyro wander. Depending on the<a class=\"read-more \" href=\"https:\/\/tommykwan.com\/blog\/aviation\/errors-on-gyroscope-instrument-wander-real-wander-total-apparent-wander\/\" title=\"Read More\"> <span class=\"button default\">Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68,64],"tags":[],"class_list":["post-7991","post","type-post","status-publish","format-standard","hentry","category-atpl-knowledge","category-aviation"],"_links":{"self":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/7991","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/comments?post=7991"}],"version-history":[{"count":16,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/7991\/revisions"}],"predecessor-version":[{"id":8011,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/7991\/revisions\/8011"}],"wp:attachment":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/media?parent=7991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/categories?post=7991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/tags?post=7991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}