{"id":17437909,"date":"2026-08-28T10:49:33","date_gmt":"2026-08-28T08:49:33","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/north-american-yf-93-penetration-fighter\/"},"modified":"2026-08-28T11:06:16","modified_gmt":"2026-08-28T09:06:16","slug":"north-american-yf-93-penetration-fighter","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/north-american-yf-93-penetration-fighter\/","title":{"rendered":"North American YF-93: The Sabre&#8217;s Forgotten Long-Range Cousin"},"content":{"rendered":"\r\n<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Look quickly and you might call it a Sabre. Look again and the differences pile up: a fatter fuselage, twin-wheel landing gear, cannon in the nose, and &mdash; strangest of all &mdash; no air intake at the front. This was the North American YF-93, a fighter built to fly halfway across a continent and still win a dogfight at the far end.<\/p>\r\n<p class=\"wp-block-paragraph\">It should have been a star. The U.S. Air Force ordered 118 of them. Instead, the production contract was killed before the prototype had even flown, and only two YF-93As were ever built. Both ended their days not as fighters but as flying laboratories.<\/p>\r\n<p class=\"wp-block-paragraph\">The YF-93 is the story of a very good aircraft overtaken by a very fast bomber.<\/p>\r\n\r\n<div style=\"background:#f5f5f5;padding:20px;border-radius:8px;margin:24px 0\"><p style=\"margin:0 0 10px;font-weight:700;font-size:18px\">Quick Facts<\/p><ul style=\"margin:0;padding-left:20px;line-height:1.8\"><li><strong>Origin:<\/strong> a heavily revised <a href=\"https:\/\/migflug.com\/aircraft\/f-86-sabre\/\">F-86 Sabre<\/a>, first designated F-86C<\/li><li><strong>Role:<\/strong> long-range penetration \/ escort fighter<\/li><li><strong>Engine:<\/strong> one Pratt &amp; Whitney J48 (a licence-built Rolls-Royce Tay), ~8,750 lb thrust with afterburner<\/li><li><strong>First flight:<\/strong> 24 January 1950, test pilot George Welch<\/li><li><strong>Built:<\/strong> two prototypes (48-317, 48-318); 118 production aircraft ordered then cancelled in 1949<\/li><li><strong>Claim to fame:<\/strong> the first aircraft to fly with flush NACA air intakes<\/li><\/ul><\/div>\r\n<h2 style=\"padding-top:22px\">A Sabre stretched for range<\/h2>\r\n<p class=\"wp-block-paragraph\">The problem the YF-93 was built to solve was as old as strategic bombing itself: bombers deep in enemy airspace need fighter escort, and early jets simply could not carry enough fuel to get there and back. In 1946 the USAAF asked for a &ldquo;penetration fighter&rdquo; with a combat radius of at least 900 miles that could still out-fight anything it met.<\/p>\r\n<p class=\"wp-block-paragraph\">North American&rsquo;s answer, project NA-157, kept the Sabre&rsquo;s swept wing and tail but changed almost everything else. A bigger Pratt &amp; Whitney J48 engine replaced the Sabre&rsquo;s J47, the fuselage grew wider and longer to swallow 1,580 gallons of fuel, and the landing gear was beefed up with twin main wheels. A search radar was planned for the nose &mdash; which is why the air intakes migrated to the sides of the fuselage.<\/p>\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=470655359  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:nuMX.cfda\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/08\/north-american-yf-93-lakebed.jpg\" alt=\"North American YF-93A on the lakebed\" 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 YF-93A on the dry lakebed at Edwards. The bulkier fuselage and side intakes set it apart from the Sabre it was based on.<\/figcaption><\/figure>\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\/hcPCdQIqW2E\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p class=\"wp-block-paragraph\">The first prototype took the boldest step of all: instead of conventional scoops, it wore flush NACA-designed intakes let into the fuselage sides, in the hope of cutting drag. The second aircraft was fitted with ordinary scoops, setting up a neat head-to-head experiment.<\/p>\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=1446239639  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:nuMX.cfda\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/08\/north-american-yf-93-cutaway.jpg\" alt=\"North American YF-93A cutaway drawing\" 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 cutaway of the YF-93A. The enlarged fuselage was essentially one big fuel tank wrapped around a J48 engine.<\/figcaption><\/figure>\r\n<h2 style=\"padding-top:22px\">Killed by the B-47<\/h2>\r\n<p class=\"wp-block-paragraph\">In June 1948 the Air Force backed its favourite with an order for 118 production aircraft, and the design was redesignated YF-93A. Then, in February 1949, the whole thing collapsed. The budget for 1949 was slashed, priority went to interceptors and bombers &mdash; and the new Boeing B-47 Stratojet was so fast that planners decided it would not need a fighter escort at all.<\/p>\r\n<p class=\"wp-block-paragraph\">The two prototypes were finished anyway, purely to compete in a fly-off against the Lockheed XF-90 and McDonnell XF-88. On 15 August 1950 the board declared the XF-88 the winner &mdash; but it was a victory over an already-doomed idea.<\/p>\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;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;McDonnell&rsquo;s victory was rather hollow, since no penetration fighters were ever actually manufactured or placed in service because the development of long-range, high-speed jet bombers such as the B-47 and the B-52 eliminated any real need for penetration fighters.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Joe Baugher<\/strong> &mdash; aviation historian<\/div><\/div><\/div>\r\n\r\n<div style=\"display:flex;justify-content:center;margin:2em 0\"><blockquote class=\"reddit-embed-bq\" data-embed-height=\"500\"><a href=\"https:\/\/www.reddit.com\/r\/WeirdWings\/comments\/v03gnb\/north_american_yf93_originally_the_f86c_a_long\/\">North American YF-93 on r\/WeirdWings<\/a><\/blockquote><script async src=\"https:\/\/embed.reddit.com\/widgets.js\" charset=\"utf-8\"><\/script><\/div>\r\n<h2 style=\"padding-top:22px\">A second life for science<\/h2>\r\n<p class=\"wp-block-paragraph\">Both YF-93As were handed to NACA&rsquo;s Ames Laboratory at Moffett Field, where the flush-versus-scoop intake question was finally settled &mdash; and not in the exotic option&rsquo;s favour.<\/p>\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #1565c0;padding:20px 22px;margin:18px 0 24px;border-radius:0 8px 8px 0;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;The standard scoop intakes were actually a better design for high-speed flight than the flush intakes.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>NACA Ames comparison tests<\/strong> &mdash; as documented by historian Joe Baugher<\/div><\/div><\/div>\r\n<p class=\"wp-block-paragraph\">Fitted later with F-86D-style tailpipes, the two aircraft flew on as NACA test and chase planes well into the mid-1950s, quietly supporting the development of the Century Series fighters &mdash; the F-101 through F-106 &mdash; before being scrapped. The escort fighter that never was had helped bring a whole generation of interceptors into being.<\/p>\r\n\r\n<div style=\"display:flex;justify-content:center;margin:2em 0\"><blockquote class=\"reddit-embed-bq\" data-embed-height=\"500\"><a href=\"https:\/\/www.reddit.com\/r\/FighterJets\/comments\/1hchevo\/\">North American YF-93 on r\/FighterJets<\/a><\/blockquote><script async src=\"https:\/\/embed.reddit.com\/widgets.js\" charset=\"utf-8\"><\/script><\/div>\r\n<p class=\"wp-block-paragraph\"><em>Sources: Joe Baugher, joebaugher.com; Wikipedia; Vintage Aviation News; NACA records.<\/em><\/p>\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\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/north-american-yf-107-ultra-sabre-cancelled-1957\/\">North American YF-107 Ultra Sabre: The Best Fighter America Never Bought<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/republic-xf-91-thunderceptor-backwards-wings\/\">Republic XF-91 Thunderceptor: The Fighter With Backwards Wings<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Look quickly and you might call it a Sabre. Look again and the differences pile up: a fatter fuselage, twin-wheel landing gear, cannon in the nose, and &mdash; strangest of all &mdash; no air intake at the front. This was the North American YF-93, a fighter built to fly halfway across a continent and still [&hellip;]<\/p>\n","protected":false},"author":23,"featured_media":17437411,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[666,664],"tags":[],"class_list":["post-17437909","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>North American YF-93: The Sabre&#039;s Lost Cousin | MiGFlug<\/title>\n<meta name=\"description\" content=\"The North American YF-93 was a long-range Sabre derivative; 118 were ordered then cancelled, leaving two prototypes to fly for NACA.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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