{"id":18480135,"date":"2026-08-31T11:13:08","date_gmt":"2026-08-31T09:13:08","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/lockheed-xv-4-hummingbird-vtol-ejector-augmenter\/"},"modified":"2026-08-31T11:13:30","modified_gmt":"2026-08-31T09:13:30","slug":"lockheed-xv-4-hummingbird-vtol-ejector-augmenter","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/de\/lockheed-xv-4-hummingbird-vtol-ejector-augmenter\/","title":{"rendered":"Lockheed XV-4 Hummingbird: The VTOL That Barely Lifted"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n\r\n\r\n<p>In the early 1960s, a boxy little jet rose slowly off the ground at a Lockheed test site in Georgia, hung in the air, and set down again. On the face of it, the Lockheed XV-4 Hummingbird had done the impossible-looking thing: vertical take-off on ordinary jet engines. In reality it was clawing its way into the air with almost nothing to spare &mdash; and the clever idea at its heart never delivered what its designers promised.<\/p><p>The Hummingbird is one of aviation&rsquo;s great &ldquo;free lunch&rdquo; stories: a physics trick that looked like a way to get lift for nothing, and quietly refused to work.<\/p>\r\n<div style=\"background:#f5f5f5;padding:20px 24px;margin:24px 0;border-radius:8px;font-size:15px;line-height:1.7\"><strong style=\"font-size:17px\">Kurzinfo<\/strong><br><strong>Flugzeug:<\/strong> Lockheed XV-4 Hummingbird (originally VZ-10)<br><strong>Operator:<\/strong> US Army research programme, built by Lockheed-Georgia<br><strong>Idea:<\/strong> &ldquo;Ejector augmenter&rdquo; VTOL &mdash; jet exhaust dragging in extra air to multiply lift<br><strong>Reality:<\/strong> Thrust-to-weight of just 1.04 &mdash; it could barely lift itself<br><strong>Gebaut:<\/strong> Two aircraft; both crashed (XV-4A in 1964, fatally; XV-4B in 1969)<br><strong>Ergebnis:<\/strong> Concept judged not competitive; programme abandoned<\/div>\r\n<h2 style=\"padding-top:22px\">The free-lunch idea<\/h2>\r\n<p>Lockheed had been studying jet ejectors since the mid-1950s, and in 1961 won a US Army contract to build two research aircraft to prove the concept. The idea was elegant. Instead of pointing the engine exhaust straight down &mdash; brute-force lift that burns enormous fuel &mdash; you feed it through carefully shaped ejector ducts inside the fuselage. The fast jet exhaust drags in a much larger mass of ambient air, and the mixed flow, in theory, produces far more lift than the raw exhaust alone.<\/p><p>The Hummingbird carried two Pratt &amp; Whitney JT12 turbojets along its flanks. Diverter valves could send their exhaust aft for normal flight, or down through the ejector chambers in the belly for hovering. The design target was a thrust augmentation of 1.4 &mdash; a 40 percent free boost. That was the whole point of the aircraft.<\/p>\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\/PK94Q0Wmjik\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=436159162  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:YK-0.d00f\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/08\/xv4a-ames-wind-tunnel.jpg\" alt=\"XV-4A Hummingbird in the NASA Ames wind tunnel\" 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 XV-4A Hummingbird under test in NASA&rsquo;s Ames 40-by-80-foot wind tunnel. Photo: NASA \/ Wikimedia Commons.<\/figcaption><\/figure>\r\n<h2 style=\"padding-top:22px\">The number that killed it: 1.04<\/h2>\r\n<p>The physics did not cooperate. When the real aircraft was tested, the ejector augmentation came out far below the promise &mdash; and the numbers were brutal. After installation losses, the Hummingbird managed a thrust-to-weight ratio of just 1.04. In other words, it could lift its own weight and almost nothing else. There was no margin for fuel, payload, or error.<\/p><p>That marginal lift did not just make the aircraft useless as a vehicle; it crippled the research programme itself, because there was no spare performance to explore.<\/p>\r\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;border-radius:0 8px 8px 0;font-size:16px;line-height:1.7\"><em>&ldquo;During the flight test program, the actual vertical thrust realized was only about 93 percent of that predicted, and consequently the aircraft, the XV-4A, had a marginal lift capability.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\">From the official XV-4 flight-test evaluation (NASA \/ US Army)<\/div><\/div>\r\n<h2 style=\"padding-top:22px\">Two aircraft, two crashes<\/h2>\r\n<p>The first XV-4A flew conventionally in July 1962, made its first free hover in May 1963, and completed the tricky transition between vertical and forward flight that November. Then, on 10 June 1964, it crashed, killing its pilot.<\/p><p>Lockheed did not give up. It rebuilt the surviving airframe as the XV-4B, throwing out the ejector trick entirely and fitting six small General Electric J85 engines &mdash; four of them pointing straight down as dedicated lift jets, the honest brute-force approach. That aircraft crashed too, in Georgia in 1969; this time the pilot, Harlan Quamme, ejected safely. With both machines gone, the programme was abandoned.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=1851081422  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:aNO7.d010\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/08\/xv4-scale-model-smithsonian.jpg\" alt=\"Scale model of the Lockheed XV-4A\" 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\">A scale model of the XV-4A, showing the boxy fuselage that housed the ejector-augmenter ducts. Model: Smithsonian \/ Wikimedia Commons.<\/figcaption><\/figure>\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;border-radius:0 8px 8px 0;font-size:16px;line-height:1.7\"><em>&ldquo;The feasibility of the augmented jet ejector concept was demonstrated; however, this concept was not considered to be competitive with other concepts for attaining a VTOL capability.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\">From the official XV-4 flight-test evaluation (NASA \/ US Army)<\/div><\/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\/nsgKc01VnJk\" 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\">The idea that would not die<\/h2>\r\n<p>The strange thing is that the ejector-augmenter concept kept seducing engineers for years afterward. Its most famous descendant, the Rockwell XFV-12A, chased the same free-lunch lift a decade later and did even worse, managing an augmentation of barely 1.1 &mdash; so little that it never flew freely at all.<\/p><p>In the end it was the honest approaches that won: direct-lift jets and, above all, the vectored thrust of the Harrier. The Hummingbird is a reminder that in aviation, when a design promises something for nothing, the something usually turns out to be the aircraft itself.<\/p>\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\/O1n-MR82rF4\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p style=\"font-style:italic;color:#777;font-size:14px\">Sources: GlobalSecurity.org (XV-4 flight-test evaluation); Wikipedia; NASA Ames; autoevolution.<\/p>\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\">\u00c4hnliche Beitr\u00e4ge<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/de\/rockwell-xfv-12-vtol-fighter-that-couldnt-hover\/\">The Rockwell XFV-12: The VTOL Fighter That Couldn&rsquo;t Hover<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/de\/lockheed-xfv-1-salmon-tailsitter-vtol-fighter\/\">The Lockheed XFV-1 Salmon: The Navy&rsquo;s Tail-Sitter<\/a><\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>In the early 1960s, a boxy little jet rose slowly off the ground at a Lockheed test site in Georgia, hung in the air, and set down again. On the face of it, the Lockheed XV-4 Hummingbird had done the impossible-looking thing: vertical take-off on ordinary jet engines. In reality it was clawing its way [&hellip;]<\/p>\n","protected":false},"author":23,"featured_media":18479324,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[666,664],"tags":[],"class_list":["post-18480135","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 v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Lockheed XV-4 Hummingbird: The VTOL That Barely Lifted<\/title>\n<meta name=\"description\" content=\"The Lockheed XV-4 Hummingbird tried to hover on an ejector-augmenter trick that promised free lift. 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