{"id":980831,"date":"2026-05-18T11:21:34","date_gmt":"2026-05-18T09:21:34","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/the-ye-150-the-mach-2-65-soviet-interceptor-that-was-cancelled\/"},"modified":"2026-05-18T11:21:41","modified_gmt":"2026-05-18T09:21:41","slug":"the-ye-150-the-mach-2-65-soviet-interceptor-that-was-cancelled","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/the-ye-150-the-mach-2-65-soviet-interceptor-that-was-cancelled\/","title":{"rendered":"The Ye-150 \u2014 The Mach 2.65 Soviet Interceptor That Was Cancelled"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n<p>In the late 1950s, the Soviet Air Defence Forces had a problem. The American B-58 Hustler had just entered service. The B-70 Valkyrie was on the drawing board. Both could cruise at Mach 2 or above, both could carry nuclear weapons, and both could outrun anything the PVO Strany had in its inventory. Mikoyan-Gurevich was asked, in March 1959, to design an interceptor that could climb to 22,000 metres, hold position there, and engage hostile bombers at velocities the world had not yet flown.<\/p><p>The answer was the Ye-150. On 8 July 1960, with senior test pilot Aleksandr Fedotov at the controls, the prototype lifted off Akhtubinsk. By 1961 it had reached 2,890 km\/h \u2014 Mach 2.65 \u2014 at 22,500 metres. It was the fastest, highest-flying single-engined fighter the Soviet Union had ever built. Most aviation enthusiasts have never heard of it. There is a reason for that.<\/p>\n\n<div style=\"background:#f5f5f5;border-radius:8px;padding:18px 22px;margin:20px 0 28px;border-left:4px solid #5C91FF\"><div style=\"font-weight:700;color:#333;margin-bottom:10px;font-size:15px;letter-spacing:0.3px\">QUICK FACTS<\/div><table style=\"border-collapse:collapse;width:100%;font-size:15px;line-height:1.5\"><tr><td style=\"padding:6px 12px 6px 0;color:#555;font-weight:600;white-space:nowrap;vertical-align:top\">Aircraft<\/td><td style=\"padding:6px 0\">Mikoyan-Gurevich Ye-150 (and derivatives Ye-152, Ye-152A, Ye-152M)<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;color:#555;font-weight:600;white-space:nowrap;vertical-align:top\">Programme<\/td><td style=\"padding:6px 0\">Soviet single-engined Mach 2.65 interceptor (1959\u20131965)<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;color:#555;font-weight:600;white-space:nowrap;vertical-align:top\">First flight<\/td><td style=\"padding:6px 0\">8 July 1960 (Ye-150 prototype)<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;color:#555;font-weight:600;white-space:nowrap;vertical-align:top\">Top speed (Ye-152M)<\/td><td style=\"padding:6px 0\">Mach 2.65 \u2014 approximately 2,890 km\/h (1,795 mph)<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;color:#555;font-weight:600;white-space:nowrap;vertical-align:top\">Service ceiling<\/td><td style=\"padding:6px 0\">22,500 m (73,800 ft)<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;color:#555;font-weight:600;white-space:nowrap;vertical-align:top\">Powerplant<\/td><td style=\"padding:6px 0\">Single Tumansky R-15-300 afterburning turbojet, 22,500 kgf<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;color:#555;font-weight:600;white-space:nowrap;vertical-align:top\">Lead designer<\/td><td style=\"padding:6px 0\">Mikhail Iosifovich Gurevich<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;color:#555;font-weight:600;white-space:nowrap;vertical-align:top\">Outcome<\/td><td style=\"padding:6px 0\">Cancelled \u2014 programme rolled into the twin-engined Ye-155 (future MiG-25 Foxbat)<\/td><\/tr><\/table><\/div>\n\n<h2 style=\"padding-top:22px\">Designing Mach 2.5<\/h2><p>The Ye-150 was Mikhail Gurevich&#8217;s last major aircraft design \u2014 Gurevich himself was 67 when the prototype flew, and he retired in 1964. The design problem was severe. At Mach 2.65 the leading edges of an aircraft heat to roughly 220 \u00b0C from skin friction alone. Aluminium softens beyond 150 \u00b0C; the structure has to be made of either steel or titanium, neither of which the Soviet Union could fabricate at the scale required for a production fighter in 1960. Gurevich split the difference. The Ye-150 used a primarily aluminium airframe but with steel structural members at the leading edges, the engine intake, and the rear fuselage where heat soak from the engine was most severe.<\/p><p>The engine was the single biggest challenge. The Tumansky R-15-300 was a brand-new high-temperature afterburning turbojet developed specifically for the Ye-150. It produced 22,500 kilograms of thrust in afterburner \u2014 more than any other Soviet engine of the era \u2014 but had a service life of only about 50 hours between overhauls when it first entered test. The engine eventually became reliable. But not in time to save the Ye-150 programme.<\/p>\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=344255226  fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/b\/b5\/Mikoyan_Ye-152M_E-166_%2810141647444%29.jpg\/1280px-Mikoyan_Ye-152M_E-166_%2810141647444%29.jpg?utm_source=commons.wikimedia.org&#038;utm_campaign=imageinfo&#038;utm_content=thumbnail\" alt=\"Mikoyan-Gurevich Ye-152M\" 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 Mikoyan-Gurevich Ye-152M, an enlarged Ye-150 derivative. The aircraft set three official world speed records in 1962, including a closed-circuit speed of 2,401 km\/h. Photo: Wikimedia Commons<\/figcaption><\/figure>\n\n<h2 style=\"padding-top:22px\">The automated interceptor concept<\/h2><p>The Ye-150 was designed to be flown, in combat, almost entirely under ground control. The Soviet PVO Strany operated a comprehensive air defence radar network \u2014 the largest in the world by the early 1960s \u2014 and Gurevich&#8217;s design assumption was that the pilot would take off, climb under ground-directed vectoring, accelerate to Mach 2.65, fire a single long-range air-to-air missile under autopilot guidance, and return to base with very little manual intervention. The pilot was essentially a system manager, not a fighter pilot in the conventional sense.<\/p><p>The aircraft carried two Kaliningrad K-9 air-to-air missiles \u2014 at the time the most ambitious Soviet AAM, with a range of 35 kilometres and a semi-active radar homing seeker. The K-9 was developed in parallel with the Ye-150 and was as troubled. Together, the airframe, engine, and weapon were an extraordinary technological gamble: three high-risk technologies dependent on each other for the system to work at all.<\/p>\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=320335277  fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/5\/56\/Air-to-air_right_side_view_of_a_Soviet_MiG-25_Foxbat_interceptor_aircraft.jpg\/1280px-Air-to-air_right_side_view_of_a_Soviet_MiG-25_Foxbat_interceptor_aircraft.jpg?utm_source=commons.wikimedia.org&#038;utm_campaign=imageinfo&#038;utm_content=thumbnail\" alt=\"Mikoyan-Gurevich MiG-25\" 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 MiG-25 Foxbat \u2014 the direct technological successor of the Ye-150. The lessons of the single-engined prototype were applied to a twin-engined production aircraft. Photo: USAF \/ Wikimedia Commons<\/figcaption><\/figure>\n\n<h2 style=\"padding-top:22px\">Why it was cancelled<\/h2><p>By 1962, the Ye-150 family had achieved most of its design targets. The Ye-152M set three official world records: an absolute speed record of 2,681 km\/h, a closed-100-km-circuit record of 2,401 km\/h, and an altitude-with-load record of 22,670 metres. The aircraft worked. It would have entered service as the world&#8217;s first Mach 2.65 single-engined interceptor.<\/p><p>Then in 1963 the United States cancelled the XB-70 Valkyrie. The Soviet threat hierarchy reshuffled almost overnight. The new top priority was no longer Mach 3 bombers \u2014 it was reconnaissance aircraft like the U-2 and SR-71, and low-flying cruise missiles. The Soviet Air Defence Forces decided they needed a twin-engined, longer-ranged interceptor instead of a single-engined point-defence Mach 2.65 specialist. Mikoyan was instructed to develop the Ye-155 \u2014 a twin-engined design based on the same R-15 powerplant \u2014 and the Ye-150 programme was wound down.<\/p><p>The Ye-155 became the MiG-25 Foxbat, which entered service in 1970 and became one of the iconic aircraft of the Cold War. The Foxbat&#8217;s steel airframe, its R-15 engines, its short-life high-temperature construction philosophy, its automated ground-controlled interception doctrine \u2014 all of these came directly from the Ye-150. The single-engined prototype died so the twin-engined production aircraft could live.<\/p>\n\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\"><a href=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/8\/87\/Coat_of_arms_of_the_Soviet_Union_%281946-1956%29.svg\/200px-Coat_of_arms_of_the_Soviet_Union_%281946-1956%29.svg.png\" target=\"_blank\" style=\"flex-shrink:0\"><img data-opt-id=2044880956  data-opt-src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/8\/87\/Coat_of_arms_of_the_Soviet_Union_%281946-1956%29.svg\/200px-Coat_of_arms_of_the_Soviet_Union_%281946-1956%29.svg.png\"  decoding=\"async\" src=\"data:image/svg+xml,%3Csvg%20viewBox%3D%220%200%20100%%20100%%22%20width%3D%22100%%22%20height%3D%22100%%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Crect%20width%3D%22100%%22%20height%3D%22100%%22%20fill%3D%22transparent%22%2F%3E%3C%2Fsvg%3E\" alt=\"Yefim Gordon\" style=\"width:96px;height:96px;border-radius:50%;object-fit:cover;object-position:center;display:block;border:2px solid #ddd\"><\/a><div><em>&ldquo;Without the Ye-150 there would have been no MiG-25. Every major engineering decision Gurevich made between 1959 and 1962 was repeated, with modification, in the Foxbat. The fact that the Ye-150 never entered service should not obscure that it was one of the most consequential prototype programmes in Soviet aviation history.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Yefim Gordon<\/strong> &mdash; Soviet aviation historian, from his 2006 monograph on the Ye-152 family<\/div><\/div><\/div>\n\n<h2 style=\"padding-top:22px\">The aircraft you have never seen<\/h2><p>Two Ye-150-family airframes survive. The Ye-152M is on outdoor static display at the Central Air Force Museum at Monino, near Moscow \u2014 visible to anyone who makes the difficult trip to the museum but unknown to almost everyone else. The Ye-152 prototype was scrapped in 1965. No Ye-150 prototype survives \u2014 both originals were used to destruction in flight testing.<\/p><p>For three years in the early 1960s, the fastest single-engined fighter in the world wore Soviet stars on a hidden test range outside Akhtubinsk. The aircraft set world records. The aircraft was then quietly cancelled, parted out, and folded into the production line of a different aircraft. The Foxbat got the fame. The Ye-150 got the engineering bills.<\/p><p><em>Sources: Central Air Force Museum (Monino), Yefim Gordon &#8220;Mikoyan Ye-152 \/ Ye-152A \/ Ye-152M&#8221; (Midland Publishing 2006), Hush-Kit Aviation World, Aviation Week archives.<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>In the early 1960s, Mikoyan built a single-engined interceptor that could reach Mach 2.65 at 22,500 metres. It worked. It set world records. Then it was cancelled \u2014 and everything it learned was rolled into the MiG-25 Foxbat.<\/p>\n","protected":false},"author":23,"featured_media":980835,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"Mikoyan Ye-150: The Mach 2.65 Soviet Interceptor Cancelled Too Soon","_yoast_wpseo_metadesc":"The Mikoyan Ye-150 was a Mach 2.65 single-engined interceptor that flew in 1960 and set three world speed records \u2014 then was rolled into the MiG-25 Foxbat programme.","_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","editor_notices":[],"footnotes":""},"categories":[666,664],"tags":[],"class_list":["post-980831","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 v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mikoyan Ye-150: The Mach 2.65 Soviet Interceptor Cancelled Too Soon<\/title>\n<meta name=\"description\" content=\"The Mikoyan Ye-150 was a Mach 2.65 single-engined interceptor that flew in 1960 and set three world speed records \u2014 then was rolled into the MiG-25 Foxbat programme.\" \/>\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\/the-ye-150-the-mach-2-65-soviet-interceptor-that-was-cancelled\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mikoyan Ye-150: The Mach 2.65 Soviet Interceptor Cancelled Too Soon\" \/>\n<meta property=\"og:description\" content=\"The Mikoyan Ye-150 was a Mach 2.65 single-engined interceptor that flew in 1960 and set three world speed records \u2014 then was rolled into the MiG-25 Foxbat programme.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/migflug.com\/jetflights\/the-ye-150-the-mach-2-65-soviet-interceptor-that-was-cancelled\/\" \/>\n<meta property=\"og:site_name\" content=\"MiGFlug.com Blog\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-18T09:21:34+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-18T09:21:41+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:B6EX.bd13\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/05\/mikoyan-ye-152m-soviet-mach2-interceptor.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"853\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Max Gr\u00fcnwald\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Max Gr\u00fcnwald\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/the-ye-150-the-mach-2-65-soviet-interceptor-that-was-cancelled\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/the-ye-150-the-mach-2-65-soviet-interceptor-that-was-cancelled\\\/\"},\"author\":{\"name\":\"Max Gr\u00fcnwald\",\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/#\\\/schema\\\/person\\\/e08e79cb0e942ed72190e62d1a936af6\"},\"headline\":\"The Ye-150 \u2014 The Mach 2.65 Soviet Interceptor That Was Cancelled\",\"datePublished\":\"2026-05-18T09:21:34+00:00\",\"dateModified\":\"2026-05-18T09:21:41+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/the-ye-150-the-mach-2-65-soviet-interceptor-that-was-cancelled\\\/\"},\"wordCount\":1001,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/the-ye-150-the-mach-2-65-soviet-interceptor-that-was-cancelled\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\/\\/migflug.com\\/jetflights\\/wp-content\\/uploads\\/sites\\/4\\/2026\\/05\\/mikoyan-ye-152m-soviet-mach2-interceptor.jpg\",\"articleSection\":[\"History &amp; 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