{"id":841,"date":"2004-12-02T15:46:00","date_gmt":"2004-12-02T14:46:00","guid":{"rendered":"https:\/\/kids.esa.int\/expendable_or_reusable\/"},"modified":"2026-10-08T00:32:53","modified_gmt":"2026-10-07T22:32:53","slug":"expendable_or_reusable","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/expendable_or_reusable\/","title":{"rendered":"Engangsbrug eller genbrug?"},"content":{"rendered":"
\n

Hver gang den europ\u00e6iske Ariane 5-raket letter fra Kourou, falder dens rakettrin ned i havet eller br\u00e6nder op i atmosf\u00e6ren. Raketter som Ariane 5 betegnes som \u2018engangsraketter\u2019.<\/p>\n<\/div>\n

At smide en raket v\u00e6k hver gang den affyres, virker spildt og dyrt. Omkostningerne holdes dog nede ved at fremstille raketter i serieproduktion. De bygges p\u00e5 samleb\u00e5nd \u2013 lidt ligesom dyre biler.<\/p>\n

Engangsraketter kan ogs\u00e5 blive meget p\u00e5lidelige. Hvis en raket svigter under opsendelsen, er det ret nemt at finde ud af, hvad der gik galt, og rette fejlen.<\/p>\n

Den anden tilgang g\u00e5r ud p\u00e5 at bygge et genanvendeligt l\u00f8ftefart\u00f8j. Indtil nu har det eneste, der har v\u00e6ret i brug, v\u00e6ret den amerikanske rumf\u00e6rge.<\/p>\n

De fleste dele af rumf\u00e6rgen er konstrueret til at kunne flyve op til 100 gange. Rumf\u00e6rgens fastbr\u00e6ndstofraketter kan ogs\u00e5 genbruges, hvis det er n\u00f8dvendigt. Det er kun den eksterne br\u00e6ndstoftank, der kasseres hver gang.<\/p>\n

Shuttle-rumf\u00e6rgen er imidlertid meget dyr at bygge og at flyve med. Det skyldes hovedsageligt, at den er konstrueret til at medbringe op til syv bes\u00e6tningsmedlemmer. Den skal desuden kunne modst\u00e5 den ekstreme varme ved genindtr\u00e6kningen i atmosf\u00e6ren og lande p\u00e5 en landingsbane. Der er ikke planer om andre genanvendelige l\u00f8ftefart\u00f8jer, selvom unders\u00f8gelserne af s\u00e5danne fart\u00f8jer forts\u00e6tter.<\/p>\n

ESA vil n\u00f8je unders\u00f8ge begge tilgange, s\u00e5 der p\u00e5 sigt kan tr\u00e6ffes en beslutning om, hvordan Ariane 5 skal erstattes.<\/p>","protected":false},"excerpt":{"rendered":"

Every time Europe\u2019s Ariane 5 lifts off from Kourou, its rocket stages fall into the ocean or burn up in the atmosphere. Launchers such as Ariane 5 are said to […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2000\/08\/atmospheric_re-entry_demonstrator_-_artist_s_impression2\/17866009-3-eng-GB\/Atmospheric_Re-entry_Demonstrator_-_artist_s_impression.jpg","esa_banner_description":"Atmospheric Re-entry Demonstrator - artist's impression","esa_banner_credit":"ESA - D.Ducros","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2000\/08\/Atmospheric_Re-entry_Demonstrator_-_artist_s_impression2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[10,41,40],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-841","post","type-post","status-publish","format-standard","hentry","category-learn","category-rockets-technology","category-technology","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/841","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=841"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/841\/revisions"}],"predecessor-version":[{"id":1984,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/841\/revisions\/1984"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=841"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=841"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=841"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=841"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=841"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=841"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=841"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=841"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=841"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=841"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}