{"id":5907941,"date":"2026-07-17T11:49:24","date_gmt":"2026-07-17T09:49:24","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/?p=5907941"},"modified":"2026-09-04T09:15:25","modified_gmt":"2026-09-04T07:15:25","slug":"le-chasseur-a-decollage-et-atterrissage-vertical-rockwell-xfv-12-incapable-de-faire-du-surplace","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/fr\/rockwell-xfv-12-vtol-fighter-that-couldnt-hover\/","title":{"rendered":"Le chasseur VTOL qui ne pouvait pas d\u00e9coller tout seul"},"content":{"rendered":"<p><style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n<!-- mfsh:top -->\n\n<style>\n.mfsh-trigger{display:inline-flex;align-items:center;gap:10px;height:44px;padding:0 18px;margin:0 0 26px;border:2px solid #0F1720;background:#fff;color:#0F1720;font-family:inherit;font-size:14px;font-weight:700;line-height:1;letter-spacing:0;text-transform:none;cursor:pointer;box-shadow:none;transition:background 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The US Navy wanted it badly. Rockwell promised it could be done.<\/p>\r\n<p>There was just one problem. When they finally hung it from a test rig and told it to lift off, the most advanced VTOL fighter America ever designed could not even pick itself up off the ground.<\/p>\r\n\r\n<div style=\"background: #f5f5f5; padding: 20px; border-radius: 8px; margin: 24px 0;\">\r\n<p style=\"margin: 0 0 10px; font-weight: bold; font-size: 15px; letter-spacing: .03em; color: #111;\">QUICK FACTS<\/p>\r\n<table style=\"border-collapse: collapse; font-size: 15px; line-height: 1.5;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 6px 12px 6px 0; font-weight: 600; color: #333; vertical-align: top; white-space: nowrap;\">Role<\/td>\r\n<td style=\"padding: 6px 0; color: #444;\">Supersonic V\/STOL fighter prototype<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 6px 12px 6px 0; font-weight: 600; color: #333; vertical-align: top; white-space: nowrap;\">First flight<\/td>\r\n<td style=\"padding: 6px 0; color: #444;\">None \u2014 tethered hover tests only (1978)<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 6px 12px 6px 0; font-weight: 600; color: #333; vertical-align: top; white-space: nowrap;\">Powerplant<\/td>\r\n<td style=\"padding: 6px 0; color: #444;\">1 \u00d7 Pratt &amp; Whitney F401 turbofan, ~30,000 lbf<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 6px 12px 6px 0; font-weight: 600; color: #333; vertical-align: top; white-space: nowrap;\">Concept<\/td>\r\n<td style=\"padding: 6px 0; color: #444;\">\"Thrust-augmented wing\" \u2014 exhaust ducted through wing and canards<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 6px 12px 6px 0; font-weight: 600; color: #333; vertical-align: top; white-space: nowrap;\">Number built<\/td>\r\n<td style=\"padding: 6px 0; color: #444;\">1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 6px 12px 6px 0; font-weight: 600; color: #333; vertical-align: top; white-space: nowrap;\">Fate<\/td>\r\n<td style=\"padding: 6px 0; color: #444;\">Cancelled 1981; could lift only ~75% of its own weight<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\n\r\n<h2 style=\"padding-top: 22px;\">The clever idea<\/h2>\r\n<p>The XFV-12 came from a 1972 Navy competition for a supersonic jump-jet to fly from small \"Sea Control Ships.\" Rockwell\u2019s answer was ingenious. To save money it borrowed a nose from the A-4 Skyhawk and intakes from the F-4 Phantom, and wrapped them around a single big Pratt &amp; Whitney turbofan.<\/p>\r\n<p>The magic was in the wing. For vertical lift, the engine\u2019s exhaust would be sealed off from the tail and ducted instead into the wing and a pair of enormous canards, blasting downward through nozzles that opened like venetian blinds. As the fast exhaust rushed through, it would drag huge volumes of surrounding air along with it \u2014 \"augmenting\" the thrust, in theory multiplying it enough to heave the jet skyward.<\/p>\r\n\r\n<div style=\"position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; margin: 24px 0;\"><iframe class=\"skip-lazy\" style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0; border-radius: 8px;\" src=\"https:\/\/www.youtube.com\/embed\/A-76SrGsfPM\" allowfullscreen=\"allowfullscreen\" data-no-lazy=\"1\"><\/iframe><\/div>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin: 0 0 24px;\"><img decoding=\"async\" class=\"skip-lazy\" style=\"max-width: 100%; height: auto; border-radius: 6px;\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/07\/rockwell-xfv-12-concept-1974.jpg\" alt=\"XFV-12 concept, 1974\" data-no-lazy=\"1\" \/>\r\n<figcaption style=\"font-size: 13px; color: #777; text-align: center; margin-top: 6px; font-style: italic;\">How it was supposed to look: a 1974 Rockwell drawing of the XFV-12 hovering beside a ship. It never performed this feat. Image: Wikimedia Commons<\/figcaption>\r\n<\/figure>\r\n\r\n<h2 style=\"padding-top: 22px;\">When theory met the test rig<\/h2>\r\n<p>Laboratory tests had predicted the wing would augment thrust by around 55%. But scaling the concept up to a real aircraft wrecked the maths. The long, convoluted ducting bled away power, and the augmentation collapsed \u2014 to just 19% at the wing, and a feeble 6% at the canard.<\/p>\r\n\r\n<div style=\"background: #f8f9fa; border-left: 4px solid  #d32f2f; padding: 20px 22px; margin: 18px 0 24px; border-radius: 0 8px 8px 0; font-size: 16px; line-height: 1.7; display: flex; gap: 20px; align-items: flex-start;\">\r\n<div><em>\u201cThe power-to-weight ratio was such that the engine was capable of vertically lifting only 75% of the weight of the aircraft in which it was mounted.\u201d<\/em>\r\n<div style=\"margin-top: 10px; font-size: 14px; color: #555;\"><strong>GlobalSecurity.org<\/strong> \u2014 on the 1978 tethered hover tests<\/div>\r\n<\/div>\r\n<\/div>\r\n\r\n<p>Seventy-five percent is a catastrophic number for a jet whose entire reason to exist was vertical flight. Tethered to its gantry through 1978, the XFV-12 strained and never rose. The program\u2019s own chief engineer chose his words carefully as the anomalies piled up.<\/p>\r\n\r\n<div style=\"background: #f8f9fa; border-left: 4px solid  #1565c0; padding: 20px 22px; margin: 18px 0 24px; border-radius: 0 8px 8px 0; font-size: 16px; line-height: 1.7; display: flex; gap: 20px; align-items: flex-start;\">\r\n<div><em>\u201cThat may have predicted the corner flow for the ejectors and isolated the vertical thrust anomalies.\u201d<\/em>\r\n<div style=\"margin-top: 10px; font-size: 14px; color: #555;\"><strong>Bob Gulcher<\/strong> \u2014 division chief engineer, XFV-12A program<\/div>\r\n<\/div>\r\n<\/div>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin: 0 0 24px;\"><img decoding=\"async\" class=\"skip-lazy\" style=\"max-width: 100%; height: auto; border-radius: 6px;\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/07\/rockwell-xfv-12a-2.jpg\" alt=\"Rockwell XFV-12A\" data-no-lazy=\"1\" \/>\r\n<figcaption style=\"font-size: 13px; color: #777; text-align: center; margin-top: 6px; font-style: italic;\">The single XFV-12A built. It was cancelled in 1981, and America ultimately bought the British-designed Harrier instead. Photo: Wikimedia Commons<\/figcaption>\r\n<\/figure>\r\n\r\n<p>With the numbers refusing to improve and costs climbing, the Navy pulled the plug in 1981. The lesson was expensive but clear: a concept that shines in a wind-tunnel model can betray you completely at full scale. In the end, America\u2019s only successful jump-jet of the era was not home-grown at all \u2014 it was the British Harrier, which simply pointed its engine nozzles down and flew.<\/p>\r\n\r\n<div style=\"position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; margin: 24px 0;\"><iframe class=\"skip-lazy\" style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0; border-radius: 8px;\" src=\"https:\/\/www.youtube.com\/embed\/ZneQVx-Zpfo\" allowfullscreen=\"allowfullscreen\" data-no-lazy=\"1\"><\/iframe><\/div>\r\n\r\n<p><em>Sources: GlobalSecurity.org; NASA Technical Reports; Vintage Aviation News; Wikipedia.<\/em><\/p>\n<!-- mfsh:bottom -->\n\n<button type=\"button\" class=\"mfsh-trigger mfsh-bottom\" data-mfsh-placement=\"bottom\" aria-haspopup=\"dialog\"><svg><use href=\"#mfsh-i-share\"\/><\/svg>Share this story<\/button>\n\n<!-- \/mfsh:bottom -->\n\r\n\r\n<div style=\"background: #f0f4ff; border-left: 4px solid #5C91FF; padding: 16px 20px; margin: 32px 0 8px; border-radius: 0 8px 8px 0;\">\r\n<p style=\"margin: 0 0 8px; font-weight: 600; color: #333;\">Related Posts<\/p>\r\n<p style=\"margin: 4px 0;\"><a href=\"https:\/\/migflug.com\/afterburner\/convair-xfy-pogo-tail-sitter-vtol-fighter-coleman\/\">The Convair XFY Pogo: Fighter That Took Off Standing Up<\/a><\/p>\r\n<p style=\"margin: 4px 0;\"><a href=\"https:\/\/migflug.com\/afterburner\/vfw-vak-191b-vtol-strike-fighter-west-germany\/\">The German Jump Jet That Lost to Math<\/a><\/p>\r\n<\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Le XFV-12 de Rockwell promettait un vol vertical supersonique avec une \u201c aile \u00e0 pouss\u00e9e augment\u00e9e \u201d \u2014 mais sur le banc d&#039;essai, il ne pouvait soulever que 75% de son propre poids.<\/p>","protected":false},"author":27,"featured_media":5907718,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[666,664],"tags":[],"class_list":["post-5907941","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-history-and-legends","category-military-aviation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rockwell XFV-12: The VTOL Fighter That Couldn&#039;t Hover<\/title>\n<meta name=\"description\" content=\"The Rockwell XFV-12 promised a Mach-2 VTOL fighter for the US Navy \u2014 then failed to lift its own weight. 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