{"id":3215775,"date":"2026-06-30T17:01:31","date_gmt":"2026-06-30T15:01:31","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/martin-xb-51-three-engine-jet-bomber\/"},"modified":"2026-07-01T09:47:59","modified_gmt":"2026-07-01T07:47:59","slug":"martin-xb-51-three-engine-jet-bomber","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/martin-xb-51-three-engine-jet-bomber\/","title":{"rendered":"The Three-Engine Jet That America Forgot"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style><p>Count the engines. Most jets have two, or four. The Martin XB-51 had three &mdash; two slung under the nose in pods, and a third buried in the tail, breathing through an intake at the base of the fin. It is one of the strangest combat aircraft the United States ever flew, and almost nobody remembers it.<\/p><p>First flown in 1949, the XB-51 was a riot of clever engineering: a wing whose angle the pilot could change in flight, a bomb bay that rotated like a revolver cylinder, and a tandem &ldquo;bicycle&rdquo; undercarriage. It was fast, it was advanced &mdash; and it was beaten by a plainer British design.<\/p>\n<div style=\"background:#f0f4ff;border:1px solid #d6e0ff;border-radius:8px;padding:16px 20px;margin:22px 0\"><p style=\"margin:0 0 8px;font-weight:700;color:#1a1a1a\">Quick Facts<\/p><table style=\"border-collapse:collapse;font-size:15px\"><tr><td style=\"padding:6px 14px 6px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Type<\/strong><\/td><td style=\"padding:6px 0;color:#222\">Prototype jet attack\/bomber (USA)<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>First flight<\/strong><\/td><td style=\"padding:6px 0;color:#222\">28 October 1949<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Power<\/strong><\/td><td style=\"padding:6px 0;color:#222\">Three General Electric J47 turbojets (two forward pods, one in the tail)<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Quirks<\/strong><\/td><td style=\"padding:6px 0;color:#222\">First variable-incidence wing on a bomber; rotating bomb bay; bicycle landing gear<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Built<\/strong><\/td><td style=\"padding:6px 0;color:#222\">Two prototypes, both lost in crashes<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Fate<\/strong><\/td><td style=\"padding:6px 0;color:#222\">Lost the USAF competition to the English Electric Canberra (Martin B-57)<\/td><\/tr><\/table><\/div>\n<h2 style=\"padding-top:22px\">A flying box of clever ideas<\/h2><p>The three J47s gave the XB-51 genuine speed &mdash; well over 600 mph down low. The headline trick was the wing: its angle of incidence could be adjusted in flight, so the fuselage could sit level on the runway while the wing still met the air at the perfect angle for takeoff and landing. It was the first variable-incidence wing fitted to a bomber.<\/p><p>Then there was the bomb bay. Instead of conventional doors, the XB-51 used a rotating bay &mdash; a Martin trademark &mdash; that could be loaded on the ground and swung up into the fuselage, slashing turnaround time. To leave room for it, the aircraft rode on a bicycle undercarriage, with tandem main wheels and little outriggers near the wingtips.<\/p>\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=1467104591  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:0e0_.b970\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/06\/martin-xb-51-prototype-1.jpg\" alt=\"The Martin XB-51\" style=\"display:block;width:100%;height:auto;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The XB-51&rsquo;s unusual layout: two engine pods under the forward fuselage and a third engine in the tail. Photo: U.S. Air Force \/ Wikimedia Commons.<\/figcaption><\/figure>\n<h2 style=\"padding-top:22px\">Beaten by the boring one<\/h2><p>The U.S. Air Force ran a competition for a new tactical bomber, and on paper the XB-51 looked the winner: faster, flashier, more advanced. But a tactical bomber has to reach its targets and loiter, and the XB-51&rsquo;s endurance and range fell short. That was decisive. The contest went to the English Electric Canberra, a conventional, twin-engine British design that did the unglamorous job better.<\/p><p>The twist of the knife: the Canberra was adopted by the USAF and built under licence by Martin itself, as the B-57. The company&rsquo;s exotic tri-jet lost to a foreign aircraft that Martin then put on its own production line &mdash; and the B-57 even inherited the XB-51&rsquo;s rotary bomb bay.<\/p><h2 style=\"padding-top:22px\">Two airframes, two crashes, no survivors<\/h2><p>Only two XB-51s were built, and both were lost. The second prototype crashed during low-level aerobatics in May 1952, killing its pilot. The first crashed on takeoff in March 1956 &mdash; while flying to a film shoot, where it had been cast as a fictional jet called the &ldquo;Gilbert XF-120&rdquo; in the movie <em>Toward the Unknown<\/em>. Neither aircraft survives. The XB-51 exists today only in photographs and a few feet of Hollywood film.<\/p><p>It is the classic cautionary tale of aviation: the cleverest aircraft does not win. The reliable one does &mdash; and gets the production contract, while the genius ends up as a movie prop and a footnote.<\/p><p style=\"font-size:13px;color:#777;font-style:italic;margin-top:18px\">Sources: Wikipedia; Flight Journal; Defense Media Network.<\/p><!-- mf-faq -->\n\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}.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;color:#5C91FF}.mf-faq-item[open] summary::after{content:\"\\2013\"}.mf-faq-answer{padding:14px 18px;color:#333;line-height:1.6}.mf-faq-answer p{margin:0}<\/style><h2 class=\"mf-faq-h\">Related Questions<\/h2><details class=\"mf-faq-item\"><summary>What was the Martin XB-51?<\/summary><div class=\"mf-faq-answer\"><p>The Martin XB-51 was an American prototype jet attack-bomber that first flew in 1949. It was notable for its three jet engines, a variable-incidence wing, and a rotating bomb bay. Only two were built, and neither entered production.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>Why did the XB-51 have three engines?<\/summary><div class=\"mf-faq-answer\"><p>Two General Electric J47 engines were mounted in pods under the forward fuselage and a third in the tail. The three-engine layout gave the aircraft high speed at low altitude, which suited its intended ground-attack role.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>Why was the XB-51 cancelled?<\/summary><div class=\"mf-faq-answer\"><p>In a U.S. Air Force fly-off, the XB-51 lost to the English Electric Canberra. Although faster, the XB-51 had shorter endurance and range, which was decisive for a tactical bomber. The Canberra was adopted and built by Martin as the B-57.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>What is a variable-incidence wing?<\/summary><div class=\"mf-faq-answer\"><p>A variable-incidence wing can have its angle relative to the fuselage changed in flight. On the XB-51 this let the fuselage stay level on the runway while the wing met the air at the optimal angle for takeoff and landing. It was the first such wing on a bomber.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>How many XB-51s were built?<\/summary><div class=\"mf-faq-answer\"><p>Only two prototypes were built. Both were lost in crashes \\u2014 one during low-level aerobatics in 1952 and the other on takeoff in 1956.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>Did any XB-51 survive?<\/summary><div class=\"mf-faq-answer\"><p>No. Both prototypes were destroyed in accidents, so no XB-51 exists today. The aircraft survives only in photographs and in footage from the 1956 film Toward the Unknown, in which it appeared as a fictional jet.<\/p><\/div><\/details><\/div>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What was the Martin XB-51?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Martin XB-51 was an American prototype jet attack-bomber that first flew in 1949. It was notable for its three jet engines, a variable-incidence wing, and a rotating bomb bay. Only two were built, and neither entered production.\"}},{\"@type\":\"Question\",\"name\":\"Why did the XB-51 have three engines?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Two General Electric J47 engines were mounted in pods under the forward fuselage and a third in the tail. 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The aircraft survives only in photographs and in footage from the 1956 film Toward the Unknown, in which it appeared as a fictional jet.\"}}]}<\/script><!-- \/mf-faq -->\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\/jetflights\/north-american-b-45-tornado-first-jet-bomber\/\">B-45 Tornado: America\u2019s First Jet Bomber<\/a><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Count the engines. Most jets have two, or four. The Martin XB-51 had three &mdash; two slung under the nose in pods, and a third buried in the tail, breathing through an intake at the base of the fin. It is one of the strangest combat aircraft the United States ever flew, and almost nobody [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":3215698,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[664],"tags":[],"class_list":["post-3215775","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-military-aviation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Three-Engine Jet That America Forgot | MiGFlug.com Blog<\/title>\n<meta name=\"description\" content=\"Count the engines. Most jets have two, or four. 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