{"id":2137370,"date":"2026-06-16T18:50:00","date_gmt":"2026-06-16T16:50:00","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/?p=2137370"},"modified":"2026-07-07T21:26:22","modified_gmt":"2026-07-07T19:26:22","slug":"convair-nb-36h-nuclear-reactor-bomber-cold-war","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/it\/convair-nb-36h-nuclear-reactor-bomber-cold-war\/","title":{"rendered":"The B-36 That Flew With a Live Nuclear Reactor"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n\n<p>Between 1955 and 1957, a B-36 bomber the size of a building flew over Texas and New Mexico with a live nuclear reactor humming in its belly. It was escorted everywhere by a planeload of armed Marines, ready to parachute down and seal off the area if it ever crashed.<\/p>\n\n<p>The Convair NB-36H \"Crusader\" was America's boldest, strangest Cold War experiment: an attempt to find out whether an aircraft could one day be powered by atomic energy and stay aloft for weeks. The reactor it carried never actually drove the propellers &mdash; but it proved the U.S. was deadly serious about nuclear flight.<\/p>\n<div style=\"background:#f5f5f5;border-radius:8px;padding:18px 22px;margin:24px 0\"><p style=\"margin:0 0 10px;font-weight:700;color:#333;font-size:15px\">Quick Facts<\/p><ul style=\"margin:0;padding-left:18px;line-height:1.75\"><li><strong>Aircraft:<\/strong> Convair NB-36H \"Crusader\" (modified B-36 Peacemaker)<\/li><li><strong>Reactor:<\/strong> a small air-cooled reactor (~1 megawatt) that ran in flight<\/li><li><strong>Powered the engines?<\/strong> No \u2014 it was a shielding and feasibility test<\/li><li><strong>Flights:<\/strong> 47 test flights, 1955&ndash;1957<\/li><li><strong>Crew protection:<\/strong> a lead-and-rubber shielded cockpit capsule<\/li><li><strong>Successor:<\/strong> the Convair X-6, cancelled in 1961<\/li><\/ul><\/div>\n<h2 style=\"padding-top:22px\">A Reactor With Wings<\/h2>\n\n<p>The dream was intoxicating: an engine that never runs out of fuel. A nuclear-powered bomber could, in theory, loiter near an enemy for days. To test the idea, Convair gutted a B-36 damaged by a tornado and rebuilt the nose as a 12-tonne shielded crew capsule of lead and leaded glass. Behind the crew sat the reactor, lowered into the bomb bay for each flight and removed afterward.<\/p>\n\n<h2 style=\"padding-top:22px\">Why It Never Powered the Plane<\/h2>\n\n<p>The NB-36H's reactor generated heat and radiation, but it was never connected to the engines. The point was to learn whether a crew could be shielded from an airborne reactor and whether the aircraft could be operated safely. The answers were sobering: the shielding needed was enormously heavy, and a crash could scatter radioactive material across the landscape &mdash; which is why those Marines flew along on every mission.<\/p>\n\n<p>The Soviets ran their own parallel experiment, the Tu-95LAL, with the same conclusion. Both superpowers eventually accepted that the weight and danger made nuclear-powered flight impractical, and the dream &mdash; along with the Convair X-6 that was meant to follow &mdash; was abandoned.<\/p>\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\/9Jt924xjaJo\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\n<p>The documentary above explains just how far both superpowers went chasing the atomic airplane.<\/p>\n\n<p><em>Sources: National Museum of the U.S. Air Force; Convair\/General Dynamics records; Real Engineering.<\/em><\/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;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><h2 class=\"mf-faq-h\">Related Questions<\/h2><details class=\"mf-faq-item\"><summary>Did a plane ever fly with a nuclear reactor on board?<\/summary><div class=\"mf-faq-answer\"><p>Yes. The Convair NB-36H, a modified B-36 Peacemaker bomber, carried a small operating nuclear reactor on 47 test flights between 1955 and 1957. The reactor ran in flight, though it did not actually power the aircraft's engines.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>What was the Convair NB-36H?<\/summary><div class=\"mf-faq-answer\"><p>The NB-36H Crusader was a modified B-36 bomber built to test whether nuclear-powered flight was feasible. It carried a small air-cooled reactor of about 1 megawatt and a heavily shielded crew capsule, flying 47 times to study reactor operation and radiation in the air.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>Did the nuclear reactor power the NB-36H?<\/summary><div class=\"mf-faq-answer\"><p>No. The roughly 1-megawatt reactor ran during flight but never drove the engines \u2014 it was purely a shielding and feasibility test. The aircraft still flew on its conventional piston and jet engines while engineers studied how to protect a crew from an airborne reactor.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>How was the NB-36H crew protected from radiation?<\/summary><div class=\"mf-faq-answer\"><p>The crew sat in a special cockpit capsule shielded with lead and rubber, designed to protect them from the reactor's radiation during flight. Studying this shielding was one of the main purposes of the entire test programme.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>Why was the nuclear aircraft program cancelled?<\/summary><div class=\"mf-faq-answer\"><p>The follow-on Convair X-6, meant to actually fly on nuclear power, was cancelled in 1961. The dangers of a reactor crash, the immense shielding weight, and the rise of intercontinental ballistic missiles made the nuclear-powered bomber unnecessary and impractical.<\/p><\/div><\/details><\/div>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Did a plane ever fly with a nuclear reactor on board?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The Convair NB-36H, a modified B-36 Peacemaker bomber, carried a small operating nuclear reactor on 47 test flights between 1955 and 1957. The reactor ran in flight, though it did not actually power the aircraft's engines.\"}},{\"@type\":\"Question\",\"name\":\"What was the Convair NB-36H?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The NB-36H Crusader was a modified B-36 bomber built to test whether nuclear-powered flight was feasible. 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The dangers of a reactor crash, the immense shielding weight, and the rise of intercontinental ballistic missiles made the nuclear-powered bomber unnecessary and impractical.\"}}]}<\/script><!-- \/mf-faq -->\n\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\">The Tu-95LAL: The Soviet Bomber Powered by a Nuclear Reactor<\/p><p style=\"margin:4px 0\">The Pilots of Chernobyl: Flying Helicopters Over an Open Nuclear Reactor<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The Convair NB-36H flew 47 times in the 1950s with an operating nuclear reactor aboard \u2014 America\u2019s wild Cold War bid for an atomic-powered bomber.<\/p>","protected":false},"author":27,"featured_media":2137069,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[666,664],"tags":[],"class_list":["post-2137370","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 v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The B-36 That Flew With a Live Nuclear Reactor<\/title>\n<meta name=\"description\" content=\"The Convair NB-36H flew with an operating nuclear reactor aboard in the 1950s \u2014 America\u2019s Cold War experiment in nuclear-powered flight.\" \/>\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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