{"id":2323000,"date":"2026-06-19T17:12:07","date_gmt":"2026-06-19T15:12:07","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/hughes-xh-17-flying-crane-largest-rotor-tip-jet\/"},"modified":"2026-09-04T09:29:25","modified_gmt":"2026-09-04T07:29:25","slug":"hughes-xh-17-flying-crane-le-plus-grand-jet-a-bout-de-rotor","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/fr\/hughes-xh-17-flying-crane-largest-rotor-tip-jet\/","title":{"rendered":"L&#039;h\u00e9licopt\u00e8re dot\u00e9 du plus grand rotor jamais construit"},"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 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Above them sits a single rotor so vast that each of its two blades weighs as much as a small car and is wide enough to walk along. And it was spun not by gears, but by jets of fire burning at the very tips of the blades.<\/p>\r\n<p>This was the Hughes XH-17 \u2014 one of the strangest flying machines ever built, and the holder of a record that still stands more than seventy years later.<\/p>\r\n\r\n<div style=\"background: #f4f6f9; border: 1px solid #e2e8f0; border-radius: 8px; padding: 18px 22px; margin: 24px 0; font-size: 15px; line-height: 1.7;\">\r\n<p style=\"margin: 0 0 8px; font-weight: bold; color: #1565c0;\">Quick Facts<\/p>\r\n<ul style=\"margin: 0; padding-left: 18px;\">\r\n<li><strong>Aircraft:<\/strong> Hughes XH-17 \u201cFlying Crane\u201d \u2014 an experimental heavy-lift research helicopter<\/li>\r\n<li><strong>Rotor:<\/strong> two blades, 134 ft (41 m) across \u2014 still the largest rotor ever flown<\/li>\r\n<li><strong>Drive:<\/strong> no main gearbox \u2014 two GE J35 turbojets fed compressed air up the hollow blades to burning tip-jets that spun the rotor<\/li>\r\n<li><strong>First flight:<\/strong> October 23, 1952, at Culver City, California<\/li>\r\n<li><strong>The catch:<\/strong> hugely inefficient \u2014 range about 40 miles. Only one was ever built<\/li>\r\n<\/ul>\r\n<\/div>\r\n\r\n<h2 style=\"padding-top: 22px;\">A Rotor You Could Almost Stand On<\/h2>\r\n<p>The XH-17\u2019s two-blade rotor measured 134 feet from tip to tip \u2014 wider than the wingspan of many airliners \u2014 and no helicopter before or since has flown with a larger one. Each blade weighed around 5,000 pounds, was roughly six feet wide and a foot thick. The whole contraption grossed more than 50,000 pounds, and was famously cobbled together from the parts bin of post-war aviation, borrowing wheels, tanks and pieces from bombers and transports.<\/p>\r\n<h2 style=\"padding-top: 22px;\">Driven by Fire at the Tips<\/h2>\r\n<p>The cleverest, maddest part was how it turned that enormous rotor. A conventional helicopter uses a heavy gearbox to drive the rotor from the hub, which creates torque that has to be cancelled by a tail rotor. The XH-17 did away with all that. Two General Electric J35 turbojets sat in the fuselage and pumped compressed air up through the hollow blades to the tips, where fuel was injected and ignited. The rotor was, in effect, dragged around by small jet engines at its own wingtips.<\/p>\r\n<p>Because the drive force was applied at the tips rather than the hub, there was almost no torque to fight \u2014 so the giant needed only a tiny tail rotor. On paper, it was elegant.<\/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\/obNlc-3NxEE\" allowfullscreen=\"allowfullscreen\" data-no-lazy=\"1\"><\/iframe><\/div>\r\n\r\n<h2 style=\"padding-top: 22px;\">Why It Never Caught On<\/h2>\r\n<p>In practice, tip-jets are spectacularly thirsty and almost unbelievably loud \u2014 the XH-17 could reportedly be heard from miles away. That inefficiency was fatal: the prototype could fly barely 40 miles before running dry. Combined with its cumbersome size, that doomed any hope of a production heavy-lifter. Just one XH-17 was ever built, and a planned larger follow-on, the XH-28, was cancelled.<\/p>\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin: 0 0 24px;\"><img decoding=\"async\" class=\"skip-lazy\" style=\"display: block; width: 100%!important; max-width: 100%!important; height: auto!important; border-radius: 6px;\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/06\/hughes-xh-17-flying-crane.jpg\" alt=\"The Hughes XH-17 helicopter\" data-no-lazy=\"1\" \/>\r\n<figcaption style=\"font-size: 13px; color: #777; text-align: center; margin-top: 6px; font-style: italic;\">The XH-17 stood on tall, spindly landing gear so it could straddle and lift bulky cargo - the \u201cflying crane\u201d idea in metal. (Photo: Wikimedia Commons)<\/figcaption>\r\n<\/figure>\r\n\r\n<p>And yet the idea behind it never died. The notion of a dedicated \u201csky crane\u201d built purely to haul heavy, awkward loads lived on in later, more practical machines. The XH-17 was a glorious dead end \u2014 but it pointed the way.<\/p>\r\n\r\n<div style=\"display: flex; justify-content: center; margin: 2em 0;\">\r\n<blockquote class=\"instagram-media\" style=\"background: #FFF; border: 0; border-radius: 3px; box-shadow: 0 0 1px 0 rgba(0,0,0,0.5),0 1px 10px 0 rgba(0,0,0,0.15); margin: 1px; max-width: 540px; min-width: 326px; padding: 0; width: 99%;\" data-instgrm-permalink=\"https:\/\/www.instagram.com\/reel\/DZGmYtjqZP6\/\" data-instgrm-version=\"14\"><a href=\"https:\/\/www.instagram.com\/reel\/DZGmYtjqZP6\/\" target=\"_blank\" rel=\"noopener\">View this post on Instagram<\/a><\/blockquote>\r\n<script async src=\"\/\/www.instagram.com\/embed.js\"><\/script><\/div>\r\n\r\n<p style=\"font-size: 13px; color: #777; font-style: italic;\">Sources: Smithsonian Magazine; Simple Flying; Old Machine Press; Wikipedia.<\/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<!-- mf-faq -->\r\n\r\n\r\n<div class=\"mf-faq-block\"><style>.mf-faq-block{margin:34px 0}.mf-faq-item:not([open]) .mf-faq-answer{display:none !important}.mf-faq-block h2.mf-faq-h{padding-top:22px;margin-bottom:14px}.mf-faq-item{border:1px solid #e2e8f5;border-radius:8px;margin:0 0 10px;background:#fff}.mf-faq-item summary{list-style:none;cursor:pointer;padding:15px 50px 15px 18px;font-weight:600;color:#1a1a1a;position:relative;line-height:1.45;user-select:none}.mf-faq-item summary::-webkit-details-marker{display:none}.mf-faq-item summary::after{content:\"+\";position:absolute;right:18px;top:50%;transform:translateY(-50%);font-size:1.5em;font-weight:400;color:#5C91FF;line-height:1}.mf-faq-item[open] summary::after{content:\"\\2013\"}.mf-faq-item[open] summary{border-bottom:1px solid #eef1f8}.mf-faq-item summary:hover{background:#f5f8ff}.mf-faq-answer{padding:14px 18px;color:#333;line-height:1.6}.mf-faq-answer p{margin:0}<\/style>\r\n<h2 class=\"mf-faq-h\">Related Questions<\/h2>\r\n<details class=\"mf-faq-item\">\r\n<summary>What aircraft had the largest helicopter rotor ever built?<\/summary>\r\n<div class=\"mf-faq-answer\">\r\n<p>The Hughes XH-17 Flying Crane, an experimental American heavy-lift helicopter of the 1950s, had the largest rotor ever flown \u2014 a two-blade rotor 134 feet (41 m) across. No helicopter before or since has flown with a bigger rotor.<\/p>\r\n<\/div>\r\n<\/details><details class=\"mf-faq-item\">\r\n<summary>How big was the XH-17's rotor?<\/summary>\r\n<div class=\"mf-faq-answer\">\r\n<p>Its two-blade rotor spanned 134 feet (41 metres) \u2014 wider than the wingspan of many airliners. It remains the largest helicopter rotor ever to fly.<\/p>\r\n<\/div>\r\n<\/details><details class=\"mf-faq-item\">\r\n<summary>How did the Hughes XH-17 work?<\/summary>\r\n<div class=\"mf-faq-answer\">\r\n<p>Instead of a conventional gearbox, the XH-17 used tip-jets: two General Electric J35 turbojets fed compressed air up through the hollow rotor blades to burners at the blade tips, and the burning jets spun the giant rotor. This avoided the huge gearbox such a rotor would need.<\/p>\r\n<\/div>\r\n<\/details><details class=\"mf-faq-item\">\r\n<summary>Why was the XH-17 never produced?<\/summary>\r\n<div class=\"mf-faq-answer\">\r\n<p>It was hugely inefficient. The tip-jet drive guzzled fuel, giving a range of only about 40 miles, which made it useless for real heavy-lift work. Only one XH-17 was ever built, and it remained a research aircraft.<\/p>\r\n<\/div>\r\n<\/details><details class=\"mf-faq-item\">\r\n<summary>When did the XH-17 first fly?<\/summary>\r\n<div class=\"mf-faq-answer\">\r\n<p>The Hughes XH-17 made its first flight on 23 October 1952 at Culver City, California. It proved that a rotor of unprecedented size could fly, even if the design was too thirsty to be practical.<\/p>\r\n<\/div>\r\n<\/details><\/div>\r\n<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What aircraft had the largest helicopter rotor ever built?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Hughes XH-17 Flying Crane, an experimental American heavy-lift helicopter of the 1950s, had the largest rotor ever flown \u2014 a two-blade rotor 134 feet (41 m) across. No helicopter before or since has flown with a bigger rotor.\"}},{\"@type\":\"Question\",\"name\":\"How big was the XH-17's rotor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Its two-blade rotor spanned 134 feet (41 metres) \u2014 wider than the wingspan of many airliners. 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It proved that a rotor of unprecedented size could fly, even if the design was too thirsty to be practical.\"}}]}<\/script><!-- \/mf-faq -->\r\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\/spruce-goose-hughes-h-4-hercules-only-flight-1947\/\">The Spruce Goose: Hughes\u2019s Giant That Flew Once<\/a><\/p>\r\n<p style=\"margin: 4px 0;\"><a href=\"https:\/\/migflug.com\/afterburner\/when-samsung-owned-the-worlds-largest-helicopter\/\">When Samsung Owned the World\u2019s Largest Helicopter<\/a><\/p>\r\n<\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Share this story Look closely at the photograph: those are two full-size 1950s automobiles, parked comfortably underneath the helicopter. Above them sits a single rotor so vast that each of its two blades weighs as much as a small car and is wide enough to walk along. And it was spun not by gears, but [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":2322913,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665,666],"tags":[],"class_list":["post-2323000","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world","category-history-and-legends"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hughes XH-17: The Biggest Rotor Ever Built<\/title>\n<meta name=\"description\" content=\"The Hughes XH-17 Flying Crane spun the largest rotor in history on jets of fire at the blade tips \u2014 a record standing for over 70 years.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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