{"id":1073983,"date":"2026-05-22T11:33:19","date_gmt":"2026-05-22T09:33:19","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/pzl-m-15-belphegor-jet-biplane-crop-duster-soviet-bloc\/"},"modified":"2026-05-22T15:46:26","modified_gmt":"2026-05-22T13:46:26","slug":"pzl-m-15-belphegor-jet-biplane-crop-duster-soviet-bloc","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/pzl-m-15-belphegor-jet-biplane-crop-duster-soviet-bloc\/","title":{"rendered":"The PZL M-15 Belphegor: A Jet-Powered Biplane Named After a Demon"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n\n<p>In 1973, a Polish state-owned aircraft factory rolled out one of the strangest production aircraft ever built. Two wings, stacked biplane-style. A 14,500-pound-thrust jet engine on the back. Two enormous pesticide tanks slung between the wings like a chemical airliner\u2019s underwing fuel pylons. A double-tail boom. A control surface arrangement that defied easy explanation. And in the cockpit, a single pilot wondering \u2014 quite possibly out loud \u2014 whether his career had taken a wrong turn somewhere.<\/p>\n\n<p>The aircraft was the PZL M-15. Its name in factory documentation was simply &#8220;M-15.&#8221; The pilots who flew it called it the <em>Belphegor<\/em> \u2014 after the demon of laziness and sloth from medieval Christian demonology. They meant it as an insult. The aircraft was loud, slow, dangerous, expensive, and uniquely unsuited to the agricultural mission it was built for. And yet \u2014 somehow \u2014 Soviet planners ordered 175 of them and put them into production.<\/p>\n\n\n<div style=\"background:#f0f0f0;padding:18px 22px;margin:24px 0;border-radius:8px;font-size:14px;line-height:1.6\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Quick Facts<\/p><p style=\"margin:4px 0\"><strong>Aircraft:<\/strong> PZL M-15 Belphegor<\/p><p style=\"margin:4px 0\"><strong>Configuration:<\/strong> Single-engine, single-seat, jet-powered, twin-tail-boom biplane agricultural aircraft<\/p><p style=\"margin:4px 0\"><strong>Engine:<\/strong> Ivchenko AI-25 turbofan, 14,500 lbf (the same engine used on the L-39 Albatros and Yak-40 airliner)<\/p><p style=\"margin:4px 0\"><strong>First flight:<\/strong> 20 May 1973<\/p><p style=\"margin:4px 0\"><strong>Designer:<\/strong> WSK PZL-Mielec, Poland (with Soviet design bureau input)<\/p><p style=\"margin:4px 0\"><strong>Total built:<\/strong> 175 production aircraft plus prototypes<\/p><p style=\"margin:4px 0\"><strong>Pesticide capacity:<\/strong> 2,200 kg in two underwing tanks<\/p><p style=\"margin:4px 0\"><strong>Cruise speed:<\/strong> Approximately 200 km\/h \u2014 slower than the biplane crop duster it was meant to replace<\/p><p style=\"margin:4px 0\"><strong>In service:<\/strong> Soviet Union (Aeroflot agricultural division), Bulgaria, Hungary<\/p><p style=\"margin:4px 0\"><strong>Why it failed:<\/strong> Wrong engine choice, wrong configuration, wrong economics \u2014 produced one aircraft for every 25 the older An-2 biplane it was meant to replace did better<\/p><p style=\"margin:4px 0\"><strong>Holds the record for:<\/strong> Only jet-powered biplane ever to enter mass production<\/p><\/div>\n\n\n<h2 style=\"padding-top:22px\">Why the Soviet Union wanted a jet crop duster<\/h2>\n\n<p>To understand the PZL M-15, you have to understand the Antonov An-2. The An-2 \u2014 affectionately nicknamed the <em>Kukuruznik<\/em> (&#8220;corn-duster&#8221;) \u2014 was an enormous single-engine biplane the Soviet Union and its satellites had been mass-producing since 1947. It was an extraordinary aircraft: it could carry 12 passengers or a tonne of cargo, take off from a 200-metre dirt strip, land at 50 km\/h, and operate in temperatures from -50\u00b0C Siberian winter to +50\u00b0C Central Asian summer. By the early 1970s, more than 18,000 An-2s had been built. The Soviet agricultural fleet alone had several thousand.<\/p>\n\n<p>The problem was that the An-2 was a biplane with a piston engine, and the Soviet aviation industry of the 1970s was supposed to be modernising. The strategic decision was made \u2014 at high political level \u2014 that the An-2\u2019s agricultural successor would be a jet. The reasoning sounded plausible on paper: a jet would cruise faster, climb higher, cover more fields per day, carry a heavier pesticide load, and demonstrate the Soviet bloc\u2019s industrial sophistication to the world.<\/p>\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=1464381298  fetchpriority=\"high\" decoding=\"async\" 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\/05\/fix-1073983-0-pzl-m-15-belphegor.jpg\" alt=\"PZL M-15 Belphegor\" 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\">A PZL M-15 Belphegor \u2014 the only jet-powered biplane ever to enter mass production. Two wings, two booms, a turbofan, two underwing pesticide tanks, and a unique nickname courtesy of the pilots who flew it. (Wikimedia Commons)<\/figcaption><\/figure>\n\n\n<h2 style=\"padding-top:22px\">Why it became a biplane<\/h2>\n\n<p>The biplane configuration was not whimsy. It came from a careful engineering calculation that turned out to be wrong. Soviet agronomists wanted a wide spray pattern, which meant a large wing area. They also wanted slow flight speed \u2014 typical crop dusting happens at 130-160 km\/h, where the pesticide cloud has time to settle on the crop instead of blowing past it. Combine large wing area with low speed and you get a wing loading the engineers thought could not be achieved with a single monoplane wing big enough for the AI-25 jet exhaust.<\/p>\n\n<p>So WSK PZL-Mielec designed a biplane. The lower wing carried the pesticide tanks. The upper wing carried the fuel. The fuselage was a pod between the two wings, with twin tail booms extending behind the upper wing to clear the jet exhaust. The single AI-25 turbofan mounted above the fuselage, behind the cockpit, exhausting between the booms.<\/p>\n\n<p>It worked, technically. It also created an aircraft that was draggier than the An-2 it replaced, no faster than the An-2, much louder than the An-2, much thirstier than the An-2 (jets burn fuel rapidly at low speed), more expensive to maintain than the An-2, and \u2014 crucially \u2014 less able to operate from short rural strips than the An-2.<\/p>\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #d32f2f;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:\/\/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\/05\/fix-1073983-1-antonov-an-2.jpg\" target=\"_blank\" style=\"flex-shrink:0\"><img data-opt-id=614952144  fetchpriority=\"high\" decoding=\"async\" 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\/05\/fix-1073983-1-antonov-an-2.jpg\" alt=\"Soviet Aeroflot agricultural pilot\" style=\"width:96px;height:96px;border-radius:50%;object-fit:cover;object-position:center;display:block;border:2px solid #ddd\"><\/a><div><em>&ldquo;The M-15 had every disadvantage a crop duster can have. It was noisier. It was thirstier. It carried less than two An-2s for the same cost. The only thing it could do that the An-2 could not was use an asphalt runway efficiently \u2014 and we did not have asphalt runways on collective farms.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Soviet Aeroflot agricultural pilot<\/strong> &mdash; Reported in Polish aviation press, 1985<\/div><\/div><\/div>\n\n\n<h2 style=\"padding-top:22px\">Why the pilots called it Belphegor<\/h2>\n\n<p>The nickname came from the M-15\u2019s appearance and its behaviour. From certain angles, the twin tail booms, the high-mounted engine, and the underwing tanks gave the aircraft a vaguely demonic silhouette \u2014 wings spread, talons extended, head crouched. The howling whine of the AI-25 turbofan at low altitude added a literal demonic soundtrack. And the aircraft\u2019s sluggish handling \u2014 heavy on the controls, sluggish in roll, prone to dropping a wing in a tight pesticide-spraying turn \u2014 earned it the Belphegor name from pilots who associated the demon of sloth with anything that responded reluctantly to control inputs.<\/p>\n\n<p>Soviet agricultural aviation history is full of pilots who refused to fly the M-15 unless ordered. By 1980, the Soviet farm aviation administration had quietly stopped expanding the fleet and was using existing M-15s only on routes where the aircraft\u2019s nominal speed advantage actually mattered (long ferry flights between fields, mostly). Production at WSK PZL-Mielec ended in 1981 after 175 aircraft were built. The line was supposed to make 3,000.<\/p>\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=364708756  data-opt-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\/05\/fix-1073983-2-polish-aviation-museum-scaled.jpg\"  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=\"PZL M-15 at Cracow Aviation Museum\" 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\">A preserved PZL M-15 at the Polish Aviation Museum in Cracow. Roughly 20 M-15 airframes survive worldwide; none are airworthy. (Wikimedia Commons)<\/figcaption><\/figure>\n\n\n<h2 style=\"padding-top:22px\">The economics that should have killed it sooner<\/h2>\n\n<p>Here is the figure that should have ended the M-15 programme before it started: an An-2 cost roughly 65,000 roubles in 1975. An M-15 cost roughly 250,000 roubles \u2014 about four times as much. The M-15 carried about 2.2 tonnes of pesticide. The An-2 carried about 1.4 tonnes. So an M-15 cost 4\u00d7 more and carried 1.5\u00d7 more. The Soviet agricultural ministry could have bought four An-2s for the price of one M-15 and treated four times as much farmland per day. The maths was always going to lose.<\/p>\n\n<p>The 175 M-15s built were operated by Soviet Aeroflot and the Polish, Bulgarian, and Hungarian agricultural aviation services until the early 1990s. The end of the Warsaw Pact and the collapse of state-run collective agriculture finally finished the type off. Most were scrapped. Roughly 20 survive in aviation museums across Eastern Europe, including at Cracow, Mielec, Sofia, and the Polish Aviation Museum at Krak\u00f3w-Czy\u017cyny.<\/p>\n\n<h2 style=\"padding-top:22px\">The world\u2019s only jet biplane in production<\/h2>\n\n<p>The PZL M-15 remains the only jet-powered biplane ever to enter mass production anywhere in the world. There have been jet biplane prototypes (the Soviet Bartini Beriev VVA-14 came close in a different configuration; various experimental and homebuilt jet biplanes have flown briefly). None of them reached production. The M-15 is, technically, a record holder.<\/p>\n\n<p>It is also a perfect case study in what happens when political prestige overrides aerodynamic and economic common sense. The Soviet aviation industry of the 1970s wanted to demonstrate it could build a modern jet agricultural aircraft because the West could not (and did not want to). It got exactly that \u2014 and an aircraft that nobody loved, nobody chose to fly twice, and nobody could afford to operate properly. The An-2 it was meant to replace is still flying in 2026. The M-15 has been dead for thirty years.<\/p>\n\n<p>If you ever find yourself at the Polish Aviation Museum in Krak\u00f3w, look for it. It sits outside, in the rain, painted blue and white in late Aeroflot agricultural livery. It looks exactly as wrong as you would expect from the only jet biplane ever made. And up close, you can almost hear it whining.<\/p>\n\n\n\n<p><em>Sources: WSK PZL-Mielec company history; Polish Aviation Museum archives; Soviet Aeroflot agricultural division records; Air International magazine retrospective (1995).<\/em><\/p>\n\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\"><a href=\"https:\/\/migflug.com\/jetflights\/antonov-a-40-flying-tank-glider-1942\">The Antonov A-40 \u2014 The Soviets Built a Flying Tank<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/avrocar-vz-9-pentagon-flying-saucer-coanda-vtol-cancelled-1961\">The Avrocar: When the Pentagon Built a Flying Saucer<\/a><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The PZL M-15 Belphegor \u2014 a jet-powered biplane crop duster \u2014 is the only jet biplane ever to enter mass production. Its pilots named it after a demon.<\/p>\n","protected":false},"author":25,"featured_media":1073987,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"pzl m-15 belphegor","_yoast_wpseo_title":"PZL M-15 Belphegor: The Jet Biplane Named After a Demon","_yoast_wpseo_metadesc":"The Polish PZL M-15 Belphegor is the only jet-powered biplane ever mass-produced \u2014 a Soviet agricultural disaster that pilots nicknamed after a demon.","_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","editor_notices":[],"footnotes":""},"categories":[666,664],"tags":[],"class_list":["post-1073983","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>PZL M-15 Belphegor: The Jet Biplane Named After a Demon<\/title>\n<meta name=\"description\" content=\"The Polish PZL M-15 Belphegor is the only jet-powered biplane ever mass-produced \u2014 a Soviet agricultural disaster that pilots nicknamed after a demon.\" \/>\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\/pzl-m-15-belphegor-jet-biplane-crop-duster-soviet-bloc\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PZL M-15 Belphegor: The Jet Biplane Named After a Demon\" \/>\n<meta property=\"og:description\" content=\"The Polish PZL M-15 Belphegor is the only jet-powered biplane ever mass-produced \u2014 a Soviet agricultural disaster that pilots nicknamed after a demon.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/migflug.com\/jetflights\/pzl-m-15-belphegor-jet-biplane-crop-duster-soviet-bloc\/\" \/>\n<meta property=\"og:site_name\" content=\"MiGFlug.com Blog\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-22T09:33:19+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-22T13:46:26+00:00\" \/>\n<meta property=\"og:image\" content=\"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\/05\/pzl-m-15-belphegor-jet-biplane.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"779\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Fortun\u00e9 Leroy\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Fortun\u00e9 Leroy\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/pzl-m-15-belphegor-jet-biplane-crop-duster-soviet-bloc\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/pzl-m-15-belphegor-jet-biplane-crop-duster-soviet-bloc\\\/\"},\"author\":{\"name\":\"Fortun\u00e9 Leroy\",\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/#\\\/schema\\\/person\\\/5c2a0903e94d20f73e438b41e79c51be\"},\"headline\":\"The PZL M-15 Belphegor: A Jet-Powered Biplane Named After a Demon\",\"datePublished\":\"2026-05-22T09:33:19+00:00\",\"dateModified\":\"2026-05-22T13:46:26+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/pzl-m-15-belphegor-jet-biplane-crop-duster-soviet-bloc\\\/\"},\"wordCount\":1363,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/pzl-m-15-belphegor-jet-biplane-crop-duster-soviet-bloc\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\/\\/migflug.com\\/jetflights\\/wp-content\\/uploads\\/sites\\/4\\/2026\\/05\\/pzl-m-15-belphegor-jet-biplane.jpg\",\"articleSection\":[\"History &amp; 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