{"id":9903,"date":"2011-03-27T16:56:27","date_gmt":"2011-03-27T15:56:27","guid":{"rendered":"http:\/\/blogs.bl0rg.net\/imaginos\/?p=9903"},"modified":"2011-03-27T16:57:37","modified_gmt":"2011-03-27T15:57:37","slug":"murphys-rule","status":"publish","type":"post","link":"https:\/\/blogs.bl0rg.net\/imaginos\/2011\/03\/27\/murphys-rule\/","title":{"rendered":"Murphy&rsquo;s rule"},"content":{"rendered":"<blockquote>\n<p style=\"text-align: justify;\">Firing <em>any<\/em> firearm (from small arms to artillery) into the air at an elevation of 50\u00b0-90\u00b0 reduces its range to 80% normal.<\/p>\n<\/blockquote>\n<p style=\"text-align: right;\"><span style=\"text-decoration: underline;\">GURPS Low-Tech<\/span>, derni\u00e8re \u00e9dition<\/p>\n<p style=\"text-align: justify;\">M\u00eame si je comprends et admets la n\u00e9cessit\u00e9 de simplifier les choses pour une utilisation r\u00f4ludique, cette r\u00e8gle appliqu\u00e9e telle quelle permet au tireur d\u00e9chargeant son arme droit en l&rsquo;air d&rsquo;atteindre des distances faramineuses&#8230;<\/p>\n<p style=\"text-align: justify;\">La mod\u00e9lisation d&rsquo;une telle trajectoire \u00e9tait pourtant (de mon temps, en tous cas) du niveau d&rsquo;une simple terminale scientifique&#8230;<\/p>\n<p style=\"text-align: justify;\">La port\u00e9e horizontale est sauf erreur de ma part (c&rsquo;est <strong><em>loin<\/em><\/strong>, tout \u00e7a&#8230;) \u00e9gale \u00e0 Vo\u00b2.sin2\u03b1\/g, donc sa variation en fonction de l&rsquo;angle de tir (\u03b1) est fonction d&rsquo;un rapport de sinus, si l&rsquo;on admet que l&rsquo;inclinaison de l&rsquo;arme ne modifie pas la vitesse initiale du projectile, la gravit\u00e9 restant la m\u00eame&#8230;<\/p>\n<p style=\"text-align: justify;\">Quant \u00e0 la fl\u00e8che, elle vaut Vo\u00b2.sin\u00b2\u03b1\/2g.<br \/>\nDonc, sauf erreur de ma part, dans le meilleur des cas elle ne sera que de 50 % de la port\u00e9e horizontale maximum (obtenue avec un angle de tir de 45\u00b0). On est bien loin des 80 % annonc\u00e9s&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Firing any firearm (from small arms to artillery) into the air at an elevation of 50\u00b0-90\u00b0 reduces its range to 80% normal. GURPS Low-Tech, derni\u00e8re \u00e9dition M\u00eame si je comprends et admets la n\u00e9cessit\u00e9 de simplifier les choses pour une &hellip; <a href=\"https:\/\/blogs.bl0rg.net\/imaginos\/2011\/03\/27\/murphys-rule\/\">Continuer la lecture <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,6,15,34],"tags":[90],"_links":{"self":[{"href":"https:\/\/blogs.bl0rg.net\/imaginos\/wp-json\/wp\/v2\/posts\/9903"}],"collection":[{"href":"https:\/\/blogs.bl0rg.net\/imaginos\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.bl0rg.net\/imaginos\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.bl0rg.net\/imaginos\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.bl0rg.net\/imaginos\/wp-json\/wp\/v2\/comments?post=9903"}],"version-history":[{"count":3,"href":"https:\/\/blogs.bl0rg.net\/imaginos\/wp-json\/wp\/v2\/posts\/9903\/revisions"}],"predecessor-version":[{"id":9905,"href":"https:\/\/blogs.bl0rg.net\/imaginos\/wp-json\/wp\/v2\/posts\/9903\/revisions\/9905"}],"wp:attachment":[{"href":"https:\/\/blogs.bl0rg.net\/imaginos\/wp-json\/wp\/v2\/media?parent=9903"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.bl0rg.net\/imaginos\/wp-json\/wp\/v2\/categories?post=9903"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.bl0rg.net\/imaginos\/wp-json\/wp\/v2\/tags?post=9903"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}