{"id":531692,"date":"2026-04-27T01:09:47","date_gmt":"2026-04-26T23:09:47","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/nasas-scissors-plane-the-ad-1-oblique-wing\/"},"modified":"2026-04-27T01:09:56","modified_gmt":"2026-04-26T23:09:56","slug":"nasas-scissors-plane-the-ad-1-oblique-wing","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/nasas-scissors-plane-the-ad-1-oblique-wing\/","title":{"rendered":"NASA&#8217;s Scissors Plane: The AD-1 Oblique Wing"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n\nWhat if, instead of sweeping both wings back like a normal variable-geometry fighter, you pivoted the entire wing on a single central hinge \u2014 so one side pointed forward and the other pointed back? The result would look like a pair of scissors in flight, deeply asymmetric, and fundamentally wrong to every instinct a pilot possesses. NASA built it anyway, flew it 79 times, and the test pilot said it handled like a shopping cart with a bad wheel.\n\nThe AD-1 \u2014 Ames-Dryden 1 \u2014 is the wildest X-plane most people have never heard of. It was designed to test a theory by legendary aerodynamicist R.T. Jones that an oblique (skewed) wing could dramatically reduce drag at transonic speeds while maintaining excellent low-speed performance. The theory was sound. The flying experience was memorable for all the wrong reasons.\n\n\n<div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:18px 22px;margin:18px 0 28px;border-radius:0 8px 8px 0\">\n<p style=\"margin:0 0 10px;font-weight:700;color:#333;font-size:17px\">Quick Facts<\/p>\n<ul style=\"margin:0;padding-left:20px;color:#444;line-height:1.8\">\n<li><strong>Full name:<\/strong> Ames-Dryden 1 (AD-1)<\/li>\n<li><strong>Operator:<\/strong> NASA Dryden Flight Research Center<\/li>\n<li><strong>First flight:<\/strong> December 21, 1979<\/li>\n<li><strong>Last flight:<\/strong> August 7, 1982<\/li>\n<li><strong>Total flights:<\/strong> 79<\/li>\n<li><strong>Wing sweep range:<\/strong> 0\u00b0 (straight) to 60\u00b0 oblique<\/li>\n<li><strong>Engines:<\/strong> 2\u00d7 Microturbo TRS-18 turbojets (220 lbs thrust each)<\/li>\n<li><strong>Max speed:<\/strong> ~322 km\/h (200 mph) \u2014 intentionally slow test aircraft<\/li>\n<li><strong>Designer:<\/strong> Burt Rutan (Ames Industrial Corporation)<\/li>\n<li><strong>Theoretical basis:<\/strong> R.T. Jones oblique wing theory (NASA Ames)<\/li>\n<\/ul>\n<\/div>\n\n\n<h2 style=\"padding-top:22px\">The Theory Behind the Madness<\/h2>\n\nR.T. Jones was one of the most brilliant aerodynamicists of the 20th century \u2014 a self-taught mathematician who joined NACA (NASA&#8217;s predecessor) and made fundamental contributions to supersonic wing theory. In the 1950s, he proposed that an oblique wing \u2014 a single wing that pivots asymmetrically around a central point \u2014 could achieve lower wave drag at transonic and supersonic speeds than conventional swept wings.\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=155093801  fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/f\/f3\/AD-1_in_flight.jpg\/960px-AD-1_in_flight.jpg\" alt=\"NASA AD-1 oblique wing aircraft in flight with wing swept\" style=\"max-width:100%;height:auto;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The NASA AD-1 with its wing swept to approximately 60 degrees \u2014 one wing points forward, the other back. It flew 79 times and the pilot compared its handling to a shopping cart. NASA<\/figcaption><\/figure>\n\n\nThe physics are counterintuitive but real. A conventional swept-wing aircraft must sweep both wings equally, which creates structural and aerodynamic compromises. The wing root carries enormous bending loads, the tips generate less lift than they would at zero sweep, and the aircraft&#8217;s performance in one configuration (high speed) comes at the cost of performance in another (low speed, takeoff, landing).\n\nAn oblique wing sidesteps these compromises. By pivoting on a central bearing, the wing maintains a constant span regardless of sweep angle. One wing moves forward (increasing its effective span) while the other moves back (reducing drag). The structural loads are carried in tension and compression through a single spar, rather than in bending \u2014 a far more efficient arrangement. Jones calculated that an oblique-wing transport aircraft could carry the same payload as a conventional design with 25% less fuel.\n\n<h2 style=\"padding-top:22px\">Built by Burt Rutan, Flown by NASA<\/h2>\n\nTo test Jones&#8217;s theory in flight, NASA contracted Burt Rutan&#8217;s Ames Industrial Corporation to build a small, inexpensive proof-of-concept aircraft. Rutan \u2014 already famous for his innovative homebuilt designs and later the designer of SpaceShipOne \u2014 created the AD-1 using fibreglass construction and two tiny Microturbo TRS-18 turbojet engines that produced just 220 pounds of thrust each.\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=1928059884  fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/6\/60\/AD-1_at_Ames.jpg\/960px-AD-1_at_Ames.jpg\" alt=\"NASA AD-1 on the ground at NASA Ames\" style=\"max-width:100%;height:auto;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The AD-1 on the ground with wings straight \u2014 in this configuration it flew normally. The wing could pivot up to 60 degrees for high-speed flight. NASA<\/figcaption><\/figure>\n\n\nThe AD-1 was never intended to fly fast. It was a low-speed research platform designed to validate the handling qualities of an oblique wing at various sweep angles. The wing could pivot from 0 degrees (straight, like a normal aircraft) to 60 degrees (dramatically skewed, with one wingtip pointing forward and the other pointing aft).\n\nAt low sweep angles \u2014 up to about 30 degrees \u2014 the AD-1 flew reasonably well. Pilots reported manageable asymmetric tendencies that could be trimmed out. But as sweep increased beyond 45 degrees, the handling deteriorated dramatically. The aircraft developed severe coupling between its axes \u2014 roll inputs produced pitch changes, yaw inputs caused rolls, and the overall feel was described by NASA test pilot Thomas McMurtry as deeply unintuitive.\n\nAt 60 degrees of sweep, the AD-1 was barely controllable. The asymmetric aerodynamic forces generated by the skewed wing created moments that the tiny aircraft&#8217;s flight controls could barely manage. Pilots found themselves constantly fighting the aircraft rather than flying it.\n\n<h2 style=\"padding-top:22px\">Right Theory, Wrong Era<\/h2>\n\nThe AD-1 program ended in 1982 after 79 flights. NASA concluded that the oblique wing theory was aerodynamically valid \u2014 Jones was right about the drag reduction \u2014 but that the handling problems at high sweep angles would require a sophisticated fly-by-wire flight control system to manage. The AD-1, with its simple mechanical controls, simply could not keep up with the aerodynamic forces.\n\nNASA studied oblique-wing concepts for military and transport aircraft throughout the 1980s and 1990s, and Boeing briefly explored an oblique flying wing design for a supersonic transport. None reached hardware. The conventional swept wing, with its well-understood behaviour and decades of engineering refinement, proved impossible to dislodge.\n\nThe AD-1 sits today at the Hiller Aviation Museum in San Carlos, California \u2014 a small, strange aircraft that proved a radical idea was aerodynamically sound, even if the pilots who flew it wished it were not quite so radical. Jones&#8217;s theory remains valid. It is simply waiting for a flight control computer smart enough to make the pilot forget that one wing is pointing the wrong way.\n\n<em style=\"color:#888;font-size:14px\">Sources: NASA Dryden Flight Research Center, NASA Technical Reports, Hiller Aviation Museum<\/em>","protected":false},"excerpt":{"rendered":"<p>What if, instead of sweeping both wings back like a normal variable-geometry fighter, you pivoted the entire wing on a single central hinge \u2014 so one side pointed forward and the other pointed back? The result would look like a pair of scissors in flight, deeply asymmetric, and fundamentally wrong to every instinct a pilot [&hellip;]<\/p>\n","protected":false},"author":26,"featured_media":531696,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","editor_notices":[],"footnotes":""},"categories":[666],"tags":[],"class_list":["post-531692","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-history-and-legends"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>NASA&#039;s Scissors Plane: The AD-1 Oblique Wing | MiGFlug.com Blog<\/title>\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\/jetflights\/nasas-scissors-plane-the-ad-1-oblique-wing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NASA&#039;s Scissors Plane: The AD-1 Oblique Wing | MiGFlug.com Blog\" \/>\n<meta property=\"og:description\" content=\"What if, instead of sweeping both wings back like a normal variable-geometry fighter, you pivoted the entire wing on a single central hinge \u2014 so one side pointed forward and the other pointed back? 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