{"id":1751,"date":"2013-02-01T20:21:18","date_gmt":"2013-02-01T19:21:18","guid":{"rendered":"http:\/\/svarthaletracing.se\/?p=1751"},"modified":"2013-02-01T20:21:18","modified_gmt":"2013-02-01T19:21:18","slug":"dragkraft-och-hastighet","status":"publish","type":"post","link":"https:\/\/svarthaletracing.se\/?p=1751","title":{"rendered":"Dragkraft och hastighet"},"content":{"rendered":"<p>Det finns en helt fantastisk rapport kallad <em>Sea-level performance tests of a 22-inch-diameter pulse-jet engine at various simulated ram pressures<\/em> att ladda ner fr\u00e5n NASAs hemsida; <a href=\"http:\/\/ntrs.nasa.gov\/search.jsp?R=19930093597\" target=\"_blank\">L\u00e4nk<\/a>.<\/p>\n<p><a href=\"http:\/\/svarthaletracing.se\/wp-content\/uploads\/2013\/02\/nacatitle.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1752\" title=\"nacatitle\" src=\"http:\/\/svarthaletracing.se\/wp-content\/uploads\/2013\/02\/nacatitle-382x480.png\" alt=\"\" width=\"382\" height=\"480\" srcset=\"https:\/\/svarthaletracing.se\/wp-content\/uploads\/2013\/02\/nacatitle-382x480.png 382w, https:\/\/svarthaletracing.se\/wp-content\/uploads\/2013\/02\/nacatitle.png 699w\" sizes=\"auto, (max-width: 382px) 100vw, 382px\" \/><\/a><\/p>\n<p>N\u00e5gon g\u00e5ng under eller efter andra v\u00e4rldskrigets slut s\u00e5 kom amerikanerna \u00f6ver en av tyskarnas V1:or. Antagligen var det inte s\u00e5 sv\u00e5rt eftersom de slagit ner lite h\u00e4r och var (m\u00e5nga tr\u00e4ffade inte alls det t\u00e4nka m\u00e5let). De byggde en replika av denna och utf\u00f6rde en rad avancerade tester. Antagligen var de intresserade av att nyttja tekniken sj\u00e4lva.<\/p>\n<p>Deras motor var en aning st\u00f6rre och gav ungef\u00e4r 220-230 kg dragkraft vid stillest\u00e5nd. H\u00e4r nedanf\u00f6r ser man ett utdrag ur rapporten d\u00e4r man ser att dragkraften \u00f6kar rej\u00e4lt vid riktigt h\u00f6ga hastigheter.<\/p>\n<p><a href=\"http:\/\/svarthaletracing.se\/wp-content\/uploads\/2013\/02\/naca.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1753\" title=\"naca\" src=\"http:\/\/svarthaletracing.se\/wp-content\/uploads\/2013\/02\/naca.png\" alt=\"\" width=\"747\" height=\"425\" srcset=\"https:\/\/svarthaletracing.se\/wp-content\/uploads\/2013\/02\/naca.png 747w, https:\/\/svarthaletracing.se\/wp-content\/uploads\/2013\/02\/naca-640x364.png 640w\" sizes=\"auto, (max-width: 747px) 100vw, 747px\" \/><\/a><\/p>\n<p>Vi \u00f6vers\u00e4tter till m\u00e5tt som vi f\u00f6rst\u00e5r:<\/p>\n<p><a href=\"http:\/\/svarthaletracing.se\/wp-content\/uploads\/2013\/02\/dragkraftHastighet.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1754\" title=\"dragkraftHastighet\" src=\"http:\/\/svarthaletracing.se\/wp-content\/uploads\/2013\/02\/dragkraftHastighet-626x480.png\" alt=\"\" width=\"626\" height=\"480\" srcset=\"https:\/\/svarthaletracing.se\/wp-content\/uploads\/2013\/02\/dragkraftHastighet-626x480.png 626w, https:\/\/svarthaletracing.se\/wp-content\/uploads\/2013\/02\/dragkraftHastighet.png 681w\" sizes=\"auto, (max-width: 626px) 100vw, 626px\" \/><\/a><\/p>\n<p>En rej\u00e4l \u00f6kning!<br \/>\nV\u00e4rt att notera \u00e4r att det \u00e4r v\u00e4ldigt h\u00f6ga hastigheter det handlar om i grafen ovan, men om man genar lite och approximerar \u00f6kningen vid 150 knyck till 10-15% s\u00e5 har vi i alla fall minst 20kg till att leka med.<\/p>\n<p>V\u00e4ldans praktiskt med \u00f6kande dragkraft vid \u00f6kande hastighet och luftmotst\u00e5nd. Som tur \u00e4r s\u00e5 \u00f6kar luftmotst\u00e5ndet snabbare&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Det finns en helt fantastisk rapport kallad Sea-level performance tests of a 22-inch-diameter pulse-jet engine at various simulated ram pressures att ladda ner fr\u00e5n NASAs hemsida; L\u00e4nk. N\u00e5gon g\u00e5ng under eller efter andra v\u00e4rldskrigets slut s\u00e5 kom amerikanerna \u00f6ver en &hellip; <a href=\"https:\/\/svarthaletracing.se\/?p=1751\">Forts\u00e4tt l\u00e4sa <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,4],"tags":[],"class_list":["post-1751","post","type-post","status-publish","format-standard","hentry","category-faktarutorguider","category-jetskotern"],"_links":{"self":[{"href":"https:\/\/svarthaletracing.se\/index.php?rest_route=\/wp\/v2\/posts\/1751","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/svarthaletracing.se\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/svarthaletracing.se\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/svarthaletracing.se\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/svarthaletracing.se\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1751"}],"version-history":[{"count":3,"href":"https:\/\/svarthaletracing.se\/index.php?rest_route=\/wp\/v2\/posts\/1751\/revisions"}],"predecessor-version":[{"id":1757,"href":"https:\/\/svarthaletracing.se\/index.php?rest_route=\/wp\/v2\/posts\/1751\/revisions\/1757"}],"wp:attachment":[{"href":"https:\/\/svarthaletracing.se\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1751"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/svarthaletracing.se\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1751"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/svarthaletracing.se\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1751"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}