{"id":18297665,"date":"2026-08-30T23:28:41","date_gmt":"2026-08-30T21:28:41","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/bell-x-5-first-variable-sweep-wing-flight\/"},"modified":"2026-10-02T23:02:54","modified_gmt":"2026-10-02T21:02:54","slug":"bell-x-5-first-variable-sweep-wing-flight","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/bell-x-5-first-variable-sweep-wing-flight\/","title":{"rendered":"Bell X-5: The First Wing to Sweep in Flight"},"content":{"rendered":"\r\n<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 .15s,color 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The Bell X-5 was the first aeroplane in the world that could change the sweep of its wings while it was flying.<\/p>\r\n<p class=\"wp-block-paragraph\">It proved that variable-geometry wings worked. It also very nearly refused to come out of a spin, and it killed one of its pilots.<\/p>\r\n\r\n<div style=\"background:#f5f5f5;padding:20px;margin:24px 0;border-radius:6px\"><p style=\"margin:0 0 10px;font-weight:700;font-size:17px\">Quick Facts<\/p><table style=\"width:100%;border-collapse:collapse;font-size:15px\"><tr><td style=\"padding:4px 12px 4px 0;color:#555;white-space:nowrap\"><strong>Aircraft<\/strong><\/td><td style=\"padding:4px 0\">Bell X-5<\/td><\/tr><tr><td style=\"padding:4px 12px 4px 0;color:#555;white-space:nowrap\"><strong>Claim to fame<\/strong><\/td><td style=\"padding:4px 0\">First aircraft to vary wing sweep in flight<\/td><\/tr><tr><td style=\"padding:4px 12px 4px 0;color:#555;white-space:nowrap\"><strong>Sweep positions<\/strong><\/td><td style=\"padding:4px 0\">20, 40 and 60 degrees<\/td><\/tr><tr><td style=\"padding:4px 12px 4px 0;color:#555;white-space:nowrap\"><strong>Inspired by<\/strong><\/td><td style=\"padding:4px 0\">The captured Messerschmitt P.1101<\/td><\/tr><tr><td style=\"padding:4px 12px 4px 0;color:#555;white-space:nowrap\"><strong>First flight<\/strong><\/td><td style=\"padding:4px 0\">20 June 1951 (Jean &ldquo;Skip&rdquo; Ziegler)<\/td><\/tr><tr><td style=\"padding:4px 12px 4px 0;color:#555;white-space:nowrap\"><strong>Engine<\/strong><\/td><td style=\"padding:4px 0\">One Allison J35 turbojet<\/td><\/tr><tr><td style=\"padding:4px 12px 4px 0;color:#555;white-space:nowrap\"><strong>Built<\/strong><\/td><td style=\"padding:4px 0\">Two<\/td><\/tr><tr><td style=\"padding:4px 12px 4px 0;color:#555;white-space:nowrap\"><strong>Legacy<\/strong><\/td><td style=\"padding:4px 0\">Paved the way for the F-111, F-14, Tornado and B-1<\/td><\/tr><\/table><\/div>\r\n<h2 style=\"padding-top:22px\">A German idea, finished in America<\/h2>\r\n<p class=\"wp-block-paragraph\">The X-5 traced its origins to a captured German design, the Messerschmitt P.1101, which could have its wing sweep reset &mdash; but only on the ground, with the aircraft parked. Bell&rsquo;s engineers, led by Robert Woods, took the idea further: they built a jet whose wings could sweep back and forth between 20, 40 and 60 degrees while airborne. To keep the aircraft balanced as the sweep changed, the entire wing assembly slid forward and back on rails.<\/p>\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/08\/bell-x-5-sweep-positions.jpg\" alt=\"Bell X-5 wing sweep positions\" style=\"width:100%;height:auto;max-width:100%;display:block;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The X-5 shown at different wing-sweep angles. Changing sweep in flight shifted the balance of the aircraft, so the whole wing slid along rails to compensate. Photo: NASA \/ Wikimedia Commons<\/figcaption><\/figure>\r\n<p class=\"wp-block-paragraph\">Bell test pilot Jean &ldquo;Skip&rdquo; Ziegler first flew the X-5 on 20 June 1951. The variable-sweep concept worked beautifully: swept forward for slow flight and landing, swept back for speed, exactly as intended.<\/p>\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/YMDW9sj0qpw\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<h2 style=\"padding-top:22px\">A vicious streak<\/h2>\r\n<p class=\"wp-block-paragraph\">The trouble was not the sweeping wing but the rest of the aeroplane. A flawed tail layout gave the X-5 a nasty, sometimes unrecoverable spin, especially with the wings swept fully back to 60 degrees. The pilots who flew it never quite trusted it.<\/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\"><em>&ldquo;The X-5 was not a comfortable airplane to fly. It was a terrible airplane in a spin. It took a long time to get that airplane out of a spin.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>A. Scott Crossfield<\/strong> &mdash; NACA research pilot<\/div><\/div>\r\n<p class=\"wp-block-paragraph\">Fellow NACA pilot Stanley Butchart put the flying technique more bluntly.<\/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\"><em>&ldquo;You just had to know that and stay away from it.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Stanley P. Butchart<\/strong> &mdash; NACA research pilot, on the X-5&rsquo;s spin<\/div><\/div>\r\n<p class=\"wp-block-paragraph\">Not everyone could. On 13 October 1953, <a href=\"https:\/\/migflug.com\/air-forces\/united-states-air-force\/\">US Air Force<\/a> Major Raymond Popson entered a spin with the wings at 60 degrees and could not recover. He was killed, and the second of the two X-5s was destroyed.<\/p>\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/08\/bell-x-5-museum.jpg\" alt=\"Bell X-5 at the National Museum of the USAF\" style=\"width:100%;height:auto;max-width:100%;display:block;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The surviving X-5 is preserved at the National Museum of the U.S. Air Force. Its data shaped every swing-wing jet that followed. Photo: U.S. Air Force<\/figcaption><\/figure>\r\n<h2 style=\"padding-top:22px\">The wing that changed everything<\/h2>\r\n<p class=\"wp-block-paragraph\">Despite its dangers, the X-5 did its job. It confirmed the wind-tunnel predictions about variable-geometry wings and gave engineers real flight data on how a swing-wing aircraft behaved. Within two decades that knowledge had produced a whole generation of swing-wing combat aircraft. A young NACA pilot named Neil Armstrong even flew the surviving X-5, years before he flew to the Moon.<\/p>\r\n<p class=\"wp-block-paragraph\">The X-5 was awkward, twitchy and never a weapon. But as a proof of concept, it was one of the most influential research aircraft ever built.<\/p>\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/7Epz041OzAw\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/sU2ts77Dp54\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n\n<style>.mfq{margin:34px 0 8px}.mfq h2{font:26px\/1.3 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117;padding-top:22px;margin:0 0 6px}.mfq .qa details{border-top:1px solid #5C91FF;margin:0;padding:0}.mfq .qa details:last-of-type{border-bottom:1px solid #e2e7ee}.mfq .qa summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;font:18px\/1.7 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117}.mfq .qa summary::-webkit-details-marker{display:none}.mfq .qa summary::after{content:\"+\";font:24px Helvetica,sans-serif;color:#3568e0;flex:0 0 auto}.mfq .qa details[open] summary::after{content:\"\\2013\"}.mfq .qa details:hover summary{color:#3568e0}.mfq .qa .a{font:16px\/1.7 \"Gilroy regular\",Helvetica,Arial,sans-serif;color:#454e5e;padding:0 26px 24px}.mfq .qa .a a{color:#3568e0}@media(max-width:680px){.mfq .qa summary{padding:18px 14px;font-size:17px}.mfq .qa .a{padding:0 14px 20px}}<\/style>\n\n\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>What was the Bell X-5?<\/summary><div class=\"a\">The first aircraft in the world able to change the sweep of its wings while flying. Two were built, and the first flight was on 20 June 1951 with Bell test pilot Jean \"Skip\" Ziegler at the controls.<\/div><\/details><details><summary>How did the Bell X-5 change its wing sweep?<\/summary><div class=\"a\">It could set 20, 40 or 60 degrees in flight. Because changing sweep shifts the aircraft&rsquo;s balance, the entire wing assembly slid forward and back on rails to compensate.<\/div><\/details><details><summary>Where did the idea come from?<\/summary><div class=\"a\">A captured German design, the Messerschmitt P.1101, whose wing sweep could be reset &mdash; but only on the ground with the aircraft parked. Bell&rsquo;s engineers under Robert Woods took the idea further and made it work in flight.<\/div><\/details><details><summary>Was the X-5 dangerous?<\/summary><div class=\"a\">Yes. It had very poor spin characteristics and was extremely reluctant to recover, and one of its pilots was killed. It proved the concept worked and demonstrated exactly how much care variable geometry demanded.<\/div><\/details><details><summary>What did the X-5 lead to?<\/summary><div class=\"a\">Every swing-wing aircraft that followed, including the <a href=\"https:\/\/migflug.com\/aircraft\/f-14-tomcat\/\">F-14 Tomcat<\/a>, the F-111, the <a href=\"https:\/\/migflug.com\/aircraft\/panavia-tornado\/\">Panavia Tornado<\/a> and the B-1.<\/div><\/details><\/div><\/section>\n\n\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What was the Bell X-5?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The first aircraft in the world able to change the sweep of its wings while flying. Two were built, and the first flight was on 20 June 1951 with Bell test pilot Jean \\\"Skip\\\" Ziegler at the controls.\"}},{\"@type\":\"Question\",\"name\":\"How did the Bell X-5 change its wing sweep?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It could set 20, 40 or 60 degrees in flight. Because changing sweep shifts the aircraft\u2019s balance, the entire wing assembly slid forward and back on rails to compensate.\"}},{\"@type\":\"Question\",\"name\":\"Where did the idea come from?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A captured German design, the Messerschmitt P.1101, whose wing sweep could be reset \u2014 but only on the ground with the aircraft parked. Bell\u2019s engineers under Robert Woods took the idea further and made it work in flight.\"}},{\"@type\":\"Question\",\"name\":\"Was the X-5 dangerous?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It had very poor spin characteristics and was extremely reluctant to recover, and one of its pilots was killed. It proved the concept worked and demonstrated exactly how much care variable geometry demanded.\"}},{\"@type\":\"Question\",\"name\":\"What did the X-5 lead to?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Every swing-wing aircraft that followed, including the F-14 Tomcat, the F-111, the Panavia Tornado and the B-1.\"}}]}<\/script><p class=\"wp-block-paragraph\"><em>Sources: NASA Dryden\/Armstrong Fact Sheet; National Museum of the USAF; 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\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/northrop-yb-49-flying-wing-b2-spirit\/\">The Northrop YB-49: The Flying Wing That Died So the B-2 Could Live<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/the-convair-b-58-hustler-first-supersonic-bomber\/\">The Convair B-58 Hustler: First Supersonic Bomber<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Share this story Every swing-wing jet that followed &mdash; the F-14 Tomcat, the F-111, the Tornado, the B-1 &mdash; owes a debt to one small, awkward and rather dangerous research aircraft from the early 1950s. The Bell X-5 was the first aeroplane in the world that could change the sweep of its wings while it [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":18297402,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[666,664],"tags":[],"class_list":["post-18297665","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 v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Bell X-5: The First Wing to Sweep in Flight | MiGFlug<\/title>\n<meta name=\"description\" content=\"The Bell X-5 was the first aircraft to change its wing sweep in flight, proving the swing-wing concept behind the F-14, F-111 and Tornado - and it was deadly.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/migflug.com\/afterburner\/bell-x-5-first-variable-sweep-wing-flight\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bell X-5: The First Wing to Sweep in Flight | MiGFlug\" \/>\n<meta property=\"og:description\" content=\"The Bell X-5 was the first aircraft to change its wing sweep in flight, proving the swing-wing concept behind the F-14, F-111 and Tornado - and it was deadly.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/migflug.com\/afterburner\/bell-x-5-first-variable-sweep-wing-flight\/\" \/>\n<meta property=\"og:site_name\" content=\"Afterburner - MiGFlug&#039;s Magazine\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/MiGFlug\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-30T21:28:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-02T21:02:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/08\/bell-x-5.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"1004\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Connor Kerr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@migflug\" \/>\n<meta name=\"twitter:site\" content=\"@migflug\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Connor Kerr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/migflug.com\\\/afterburner\\\/bell-x-5-first-variable-sweep-wing-flight\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/afterburner\\\/bell-x-5-first-variable-sweep-wing-flight\\\/\"},\"author\":{\"name\":\"Connor Kerr\",\"@id\":\"https:\\\/\\\/migflug.com\\\/afterburner\\\/it\\\/#\\\/schema\\\/person\\\/bc7f2d09b1d7111c45fdb1335b8f2cf9\"},\"headline\":\"Bell X-5: The First Wing to Sweep in Flight\",\"datePublished\":\"2026-08-30T21:28:41+00:00\",\"dateModified\":\"2026-10-02T21:02:54+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/afterburner\\\/bell-x-5-first-variable-sweep-wing-flight\\\/\"},\"wordCount\":791,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/afterburner\\\/it\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/afterburner\\\/bell-x-5-first-variable-sweep-wing-flight\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/migflug.com\\\/afterburner\\\/wp-content\\\/uploads\\\/sites\\\/4\\\/2026\\\/08\\\/bell-x-5.jpg\",\"articleSection\":[\"History &amp; 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