{"id":29615409,"date":"2026-10-26T10:29:31","date_gmt":"2026-10-26T09:29:31","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/turbojet-vs-turbofan-vs-turboprop-turboshaft-bypass-ratio-explained\/"},"modified":"2026-10-26T10:29:50","modified_gmt":"2026-10-26T09:29:50","slug":"turbojet-vs-turbofan-vs-turboprop-turboshaft-bypass-ratio-explained","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/es\/turbojet-vs-turbofan-vs-turboprop-turboshaft-bypass-ratio-explained\/","title":{"rendered":"Turbojet vs Turbofan vs Turboprop: How Jet Engines Differ"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n<!-- mfsh:top -->\r\n\r\n<style>\r\n.mfsh-trigger{display:inline-flex;align-items:center;gap:10px;height:44px;padding:0 18px;margin:0 0 26px;border:2px solid 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A regional airliner with two big propellers. A widebody whose engine intakes are so wide you could almost stand up inside them. And, if you are lucky, a slim two-seat jet trainer with a hot, narrow tailpipe and no visible fan at all.<\/p>\r\n\r\n<p>Underneath, all three run on the same basic machine: a gas turbine. Air is squeezed, burned with kerosene and expanded through a turbine that keeps the whole thing spinning. What makes a turbojet, a turbofan, a turboprop and a turboshaft so different is not how they make energy. It is how they spend it.<\/p>\r\n\r\n<p>That single decision, how much of the core&rsquo;s power is turned into a fast, hot jet and how much is handed to a fan, a propeller or a rotor, shapes everything from fuel bills to engine noise to whether an aircraft can go supersonic. Here is turbojet vs turbofan vs turboprop, explained, and why every aircraft ends up where it does.<\/p>\r\n\r\n\r\n<div style=\"background:#f4f6f9;border:1px solid #e2e7ee;padding:18px 22px;margin:22px 0 26px\"><p style=\"margin:0 0 8px;font-weight:700;color:#0d1117\">Quick Facts<\/p><ul style=\"margin:0;padding-left:18px\"><li style=\"margin:4px 0\"><strong>Common core:<\/strong> Compressor, combustor and turbine (the gas generator)<\/li><li style=\"margin:4px 0\"><strong>Turbojet:<\/strong> All air passes through the core; bypass ratio zero. Example: GE J79 (F-4 Phantom II)<\/li><li style=\"margin:4px 0\"><strong>Low-bypass turbofan:<\/strong> Fighter engines; Eurojet EJ200 (Eurofighter Typhoon) 0.4:1<\/li><li style=\"margin:4px 0\"><strong>Medium-bypass turbofan:<\/strong> Ivchenko AI-25TL (Aero L-39 Albatros) 2:1<\/li><li style=\"margin:4px 0\"><strong>High-bypass turbofan:<\/strong> Airliners; GE9X about 10:1, PW1000G 12.5:1<\/li><li style=\"margin:4px 0\"><strong>Turboprop:<\/strong> Propeller gives about 90% of thrust; rarely flown above Mach 0.6 to 0.7<\/li><li style=\"margin:4px 0\"><strong>Turboshaft:<\/strong> All power to a shaft; GE T700 in the UH-60 Black Hawk<\/li><li style=\"margin:4px 0\"><strong>Key idea:<\/strong> Moving a lot of air a little beats moving a little air a lot<\/li><\/ul><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">One core, four ways to spend it<\/h2>\r\n\r\n<p>Every one of these engines is built around a gas generator: compressor, combustor and turbine, the &ldquo;suck, squeeze, bang, blow&rdquo; sequence covered in our explainer <a href=\"https:\/\/migflug.com\/afterburner\/how-does-a-jet-engine-work\/\">How Does a Jet Engine Work?<\/a> The turbine takes just enough energy from the hot gas to drive the compressor. What remains is the engine&rsquo;s budget.<\/p>\r\n\r\n<p>A <strong>turbojet<\/strong> spends the whole budget on one thing: blasting its exhaust out of the nozzle as fast as possible. A <strong>turbofan<\/strong> adds extra turbine stages to drive a ducted fan at the front, and part of the air goes around the core instead of through it. A <strong>turboprop<\/strong> pushes the idea much further, extracting almost all the remaining energy through a gearbox to turn a propeller. A <strong>turboshaft<\/strong> goes all the way and sends its power down a shaft, usually to a helicopter rotor.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/general-electric-j79-turbojet-sectioned-deutsches-museum.jpg\" alt=\"Sectioned General Electric J79-11A turbojet showing its axial compressor blades and combustion section at the Deutsches Museum\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">A sectioned General Electric J79 turbojet at the Deutsches Museum in Munich. In a turbojet every bit of intake air passes through the compressor, combustor and turbine. Photo: Wilfredor \/ Wikimedia Commons, CC0<\/figcaption><\/figure>\r\n\r\n\r\n<p>The turbojet came first. The General Electric J79, the engine that powered the <a href=\"https:\/\/migflug.com\/aircraft\/f-4-phantom-ii\/\">F-4 Phantom II<\/a> and the <a href=\"https:\/\/migflug.com\/aircraft\/b-58-hustler\/\">B-58 Hustler<\/a>, is a classic example: every gram of air that enters the intake passes through the combustor and leaves through the nozzle at enormous speed. It is simple, compact and very good at high supersonic speed. At ordinary airliner speeds, it wastes a startling amount of fuel.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">The aha: why fast exhaust is wasteful<\/h2>\r\n\r\n<p>A jet engine makes thrust by speeding air up. But any air that leaves the nozzle faster than the aircraft is flying also leaves behind a wake of wasted kinetic energy. The faster the jet relative to the aircraft, the more energy goes into that wake rather than into pushing the aeroplane along.<\/p>\r\n\r\n<p>Engineers call this propulsive efficiency, and the classic Froude formula makes it brutally simple: efficiency equals 2 divided by (1 plus jet speed over flight speed). If the exhaust leaves at twice the aircraft&rsquo;s speed, propulsive efficiency is about 67 percent. If it leaves at three times the speed, it falls to 50 percent. Make the jet barely faster than the aircraft and efficiency approaches 100 percent, although you then need a huge mass of air to make useful thrust.<\/p>\r\n\r\n<p>That is the whole secret of the turbofan, and of the propeller before it. Accelerating a large mass of air a little is more efficient than accelerating a small mass of air a lot. Frank Whittle saw it early: his March 1936 British patent already described the principle of what we now call a turbofan, for aircraft flying at around 500 mph.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0 8px\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/L24Wf0VlTE0\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p style=\"font-size:13px;color:#777;text-align:center;font-style:italic;margin:0 0 24px\">Animagraffs&rsquo; animated cutaway shows how air flows through the fan, core and bypass duct of a modern turbofan.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Bypass ratio: from 0.3 to more than 12<\/h2>\r\n\r\n<p>The number that describes how far an engine leans towards the &ldquo;lots of air, gently&rdquo; side is the bypass ratio: the mass of air that goes around the core divided by the mass that goes through it. A bypass ratio of 6 means six kilograms of air flow through the fan duct for every kilogram that is burned in the core.<\/p>\r\n\r\n<p>The first production turbofan, the Rolls-Royce Conway, had a bypass ratio of only about 0.3. Airliner engines of the 1960s such as the Pratt &amp; Whitney JT8D and the Rolls-Royce Spey were closer to 1. Then came the high-bypass revolution: the General Electric TF39, built for the <a href=\"https:\/\/migflug.com\/aircraft\/c-5-galaxy\/\">C-5 Galaxy<\/a>, became the first production high-bypass turbofan, and big fans spread quickly to widebody airliners.<\/p>\r\n\r\n<p>Today&rsquo;s numbers are striking. GE quotes an approximate 10:1 bypass ratio for the GE9X on the Boeing 777X, with a fan more than 11 feet (134.5 inches) across, wider than the fuselage of a Boeing 737. The geared Pratt &amp; Whitney PW1000G, in service since 2016, reaches 12.5:1. On these engines the fan produces the vast majority of the thrust, and the core&rsquo;s main job is simply to drive it.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #1565c0;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><div><em>&ldquo;The jet engines powering virtually all passenger jets are called high-bypass turbofans. That&rsquo;s because the vast majority of the thrust comes from the fan at the front of the engine.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Ted Ingling<\/strong> &mdash; General manager of the GE9X engine program, in a GE Reports interview, January 2020<\/div><\/div><\/div>\r\n\r\n\r\n<p>There is a bonus. Jet noise comes mostly from fast exhaust tearing into still air, so slower bypass air makes a high-bypass turbofan far quieter than a turbojet of the same thrust. Bigger is not automatically better, though: a larger fan adds weight and drag and has to fit under the wing with enough ground clearance.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0 8px\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/UsY5g3iV1rg\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p style=\"font-size:13px;color:#777;text-align:center;font-style:italic;margin:0 0 24px\">GE Aerospace footage of the GE9X&rsquo;s first flight on 13 March 2018, under the wing of GE&rsquo;s Boeing 747 flying testbed at Victorville, California.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Why fighters stay skinny<\/h2>\r\n\r\n<p>If big fans are so efficient, why do fighters not use them? Because a fighter needs something an airliner does not: lots of thrust from a small frontal area, and the ability to keep pushing at supersonic speed. A high-bypass engine&rsquo;s thrust falls away as speed rises, while its fat nacelle would add drag the fighter cannot afford.<\/p>\r\n\r\n<p>Most modern fighter engines are therefore low-bypass turbofans. The Eurojet EJ200 in the <a href=\"https:\/\/migflug.com\/aircraft\/eurofighter-typhoon\/\">Eurofighter Typhoon<\/a> has a bypass ratio of 0.4:1 and produces about 13,500 lbf dry and 20,000 lbf with afterburner, according to partner MTU Aero Engines. Its bypass and core flows mix before the afterburner, where extra fuel is burned for take-off and combat. Fighter fans also have several stages, and some engines, such as the GE F404, use variable inlet guide vanes to protect against the <a href=\"https:\/\/migflug.com\/afterburner\/compressor-stall-jet-engine-surge-explained\/\">compressor stall<\/a>.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/eurojet-ej200-low-bypass-turbofan-afterburner-ila-berlin.jpg\" alt=\"View into the afterburner section of a Eurojet EJ200 low-bypass turbofan for the Eurofighter Typhoon at ILA Berlin 2016\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">Looking into the afterburner of a Eurojet EJ200, the low-bypass turbofan of the Eurofighter Typhoon, at ILA Berlin 2016. Bypass and core air mix before this section. Photo: Julian Herzog \/ Wikimedia Commons, CC BY 4.0<\/figcaption><\/figure>\r\n\r\n\r\n<p>The small bypass still pays its way. The cooler bypass air makes cruise more economical than a pure turbojet and helps keep the afterburner section cool. On a modern engine, a <a href=\"https:\/\/migflug.com\/afterburner\/fadec-full-authority-digital-engine-control-explained\/\">FADEC<\/a> computer juggles fuel flow, nozzle area and guide vanes so the pilot can slam the throttle without worrying about any of it.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #d32f2f;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><div><em>&ldquo;Many modern fighter planes actually use low bypass ratio turbofans equipped with afterburners. They can then cruise efficiently but still have high thrust when dogfighting.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>NASA Glenn Research Center<\/strong> &mdash; Beginner&rsquo;s Guide to Aeronautics, &ldquo;Turbofan Engine&rdquo;<\/div><\/div><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">The L-39: a turbofan in a trainer<\/h2>\r\n\r\n<p>Between those two extremes sits an engine that thousands of pilots learned on. When the <a href=\"https:\/\/migflug.com\/aircraft\/l-39-albatros\/\">Aero L-39 Albatros<\/a> made its first flight on 4 November 1968, it became the first trainer aircraft in the world to be powered by a turbofan. Its engine, the Ivchenko AI-25TL, is a medium-bypass turbofan with a bypass ratio of 2:1 and a rated thrust of 16.87 kN (3,790 lb).<\/p>\r\n\r\n<p>The AI-25 family was originally designed for the Yakovlev Yak-40 tri-jet airliner, and the uprated AI-25TL was developed for the L-39. For a trainer, the choice made sense. A turbofan is more economical than a turbojet at the subsonic speeds where a trainer spends its life, and the engine helped make the L-39 an economical jet for the many air forces that bought it.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/ivchenko-ai-25tl-turbofan-l-39-engine-szolnok.jpg\" alt=\"Ivchenko AI-25TL medium-bypass turbofan engine of the Aero L-39 Albatros on display at the Hungarian Aviation Museum in Szolnok\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">An Ivchenko AI-25TL turbofan, the engine of the Aero L-39 Albatros, on display at the Hungarian Aviation Museum in Szolnok. Note the fan at the front of the core. Photo: VargaA \/ Wikimedia Commons, CC BY-SA 4.0<\/figcaption><\/figure>\r\n\r\n\r\n<p>With no afterburner and a modest bypass flow, the L-39 sounds nothing like a fighter at full reheat. The test run below shows a turbofan for the L-39 running on its own, outside the airframe.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0 8px\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/Le1p6R-D8hc\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p style=\"font-size:13px;color:#777;text-align:center;font-style:italic;margin:0 0 24px\">A turbofan engine for the L-39 Albatros on a test run, filmed by the engine-overhaul channel AgentJayZ.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Turboprops: the short-haul champions<\/h2>\r\n\r\n<p>A propeller is, in effect, a huge, unducted fan. Turboprops are often described as having bypass ratios of around 50 to 100, and only about 10 percent of a turboprop&rsquo;s thrust comes from its exhaust. Almost everything the core produces goes through a reduction gearbox to turn the propeller at a much lower speed than the turbine.<\/p>\r\n\r\n<p>That gives superb efficiency at low speed, which is why turboprops dominate short regional routes, where a jet&rsquo;s higher cruising speed saves only a few minutes. Their weakness is the propeller tip. As flight speed rises, the blade tips approach the speed of sound and efficiency collapses, so turboprops rarely fly faster than about Mach 0.6 to 0.7. The <a href=\"https:\/\/migflug.com\/aircraft\/tu-95-bear\/\">Tu-95 Bear<\/a> with its contra-rotating propellers is the famous exception.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/europrop-tp400-turboprop-raf-a400m-atlas.jpg\" alt=\"Two Europrop TP400 turboprop engines with eight-bladed propellers under the wing of the first Royal Air Force Airbus A400M Atlas at RAF Brize Norton\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">Europrop TP400 turboprops under the wing of ZM400, the first RAF Airbus A400M Atlas, at RAF Brize Norton. A gearbox turns each propeller far slower than the turbine. Photo: Sharron Floyd, RAF Brize Norton \/ Open Government Licence v2<\/figcaption><\/figure>\r\n\r\n\r\n<p>At the big end of the scale sits the Europrop TP400 on the <a href=\"https:\/\/migflug.com\/aircraft\/a400m-atlas\/\">Airbus A400M Atlas<\/a>, rated at about 11,000 shaft horsepower and the most powerful turboprop in service with a single propeller. The <a href=\"https:\/\/migflug.com\/air-forces\/united-kingdom-royal-air-force\/\">Royal Air Force<\/a> flies the type as the Atlas; the photo above shows its first example at RAF Brize Norton.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Turboshafts: all shaft, no thrust<\/h2>\r\n\r\n<p>Remove the propeller, keep the gearbox and power turbine, and you have a turboshaft. The exhaust provides essentially no useful thrust. All the work goes down a shaft, which in a helicopter drives the main and tail rotors. The <a href=\"https:\/\/migflug.com\/aircraft\/uh-60-black-hawk\/\">UH-60 Black Hawk<\/a> uses two General Electric T700 turboshafts. The same core architecture runs auxiliary power units, ships and even the M1 Abrams tank.<\/p>\r\n\r\n<p>The families are closer than they look. The first experimental high-bypass turbofan, the Avco Lycoming PLF1A-2 of 1962, was derived from a T55 helicopter turboshaft. And the F135 in the <a href=\"https:\/\/migflug.com\/aircraft\/f-35-lightning-ii\/\">F-35B<\/a> switches partly into turboshaft mode in hover, sending about 29,000 horsepower forward through a shaft to drive its lift fan.<\/p>\r\n\r\n<p>So the next time you board, look at the engine. A propeller means a short hop and a thrifty operator. A giant fan means the engine is quietly moving ten times more air around its core than through it. And a narrow, glowing tailpipe means someone chose speed over economy. It is the same gas turbine every time. Only the budget changes.<\/p>\r\n\r\n\r\n\r\n<p><em>Sources: NASA Glenn Research Center (Beginner&rsquo;s Guide to Aeronautics), GE Aerospace, GE Reports, MTU Aero Engines, LeteckeMotory.cz, MiGFlug, Wikipedia (Turbofan; Turboprop; Turboshaft; Propulsive efficiency; Ivchenko AI-25; Aero L-39 Albatros)<\/em><\/p>\r\n<!-- mfsh:bottom -->\r\n\r\n<button type=\"button\" class=\"mfsh-trigger mfsh-bottom\" data-mfsh-placement=\"bottom\" aria-haspopup=\"dialog\"><svg><use href=\"#mfsh-i-share\"\/><\/svg>Share this story<\/button>\r\n\r\n<!-- \/mfsh:bottom -->\r\n\r\n\r\n<style>.mfq{margin:34px 0 8px}.mfq h2{font:26px\/1.3 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117;padding-top:22px;margin:0 0 6px}.mfq .qa details{border-top:1px solid #5C91FF;margin:0;padding:0}.mfq .qa details:last-of-type{border-bottom:1px solid #e2e7ee}.mfq .qa summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;font:18px\/1.7 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117}.mfq .qa summary::-webkit-details-marker{display:none}.mfq .qa summary::after{content:\"+\";font:24px Helvetica,sans-serif;color:#3568e0;flex:0 0 auto}.mfq .qa details[open] summary::after{content:\"\\2013\"}.mfq .qa details:hover summary{color:#3568e0}.mfq .qa .a{font:16px\/1.7 \"Gilroy regular\",Helvetica,Arial,sans-serif;color:#454e5e;padding:0 26px 24px}.mfq .qa .a a{color:#3568e0}@media(max-width:680px){.mfq .qa summary{padding:18px 14px;font-size:17px}.mfq .qa .a{padding:0 14px 20px}}<\/style>\r\n\r\n\r\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>What is the difference between a turbojet and a turbofan?<\/summary><div class=\"a\">In a turbojet, all the air entering the intake passes through the compressor, combustor and turbine and leaves as a fast, hot jet. A turbofan uses extra turbine stages to drive a fan, and part of the air bypasses the core. Moving more air more slowly makes the turbofan quieter and much more fuel efficient at subsonic speeds.<\/div><\/details><details><summary>What is the bypass ratio of a jet engine?<\/summary><div class=\"a\">The bypass ratio is the mass of air flowing around the engine core divided by the mass flowing through it. A turbojet has a ratio of zero, fighter engines such as the Eurojet EJ200 about 0.4:1, the L-39&rsquo;s Ivchenko AI-25TL 2:1, and modern airliner engines such as the GE9X about 10:1 or more.<\/div><\/details><details><summary>Why do airliners use high-bypass turbofans?<\/summary><div class=\"a\">Airliners use high-bypass turbofans because accelerating a large mass of air a little is more efficient than accelerating a small mass of air a lot. The slower exhaust wastes less energy, which cuts fuel burn, and it is much quieter. On engines like the GE9X, the fan produces the vast majority of the thrust.<\/div><\/details><details><summary>Why do fighter jets use low-bypass turbofans?<\/summary><div class=\"a\">Fighter jets need high thrust from a small frontal area and must keep accelerating at supersonic speed, where a big fan would add drag and lose thrust. Low-bypass turbofans such as the Eurofighter Typhoon&rsquo;s EJ200, with a 0.4:1 bypass ratio, combine reasonable cruise economy with an afterburner for take-off and combat.<\/div><\/details><details><summary>Why are turboprops used on short routes?<\/summary><div class=\"a\">Turboprops are very efficient at lower speeds because the propeller moves a huge mass of air gently, giving bypass ratios of around 50 to 100. On short regional routes a jet saves only minutes. Propellers lose efficiency as their tips approach the speed of sound, so turboprops rarely fly faster than about Mach 0.6 to 0.7.<\/div><\/details><details><summary>What is a turboshaft engine?<\/summary><div class=\"a\">A turboshaft is a gas turbine that delivers almost all its power through a shaft instead of jet thrust. It is used mainly in helicopters to drive the rotors, as in the two General Electric T700 engines of the UH-60 Black Hawk, and also in auxiliary power units, ships and tanks such as the M1 Abrams.<\/div><\/details><details><summary>What engine does the L-39 Albatros have?<\/summary><div class=\"a\">The Aero L-39 Albatros is powered by a single Ivchenko AI-25TL turbofan with a bypass ratio of 2:1 and 16.87 kN (3,790 lb) of thrust. When the L-39 first flew on 4 November 1968, it became the first trainer aircraft in the world to be powered by a turbofan engine.<\/div><\/details><details><summary>Can I fly in an L-39?<\/summary><div class=\"a\">Yes. MiGFlug has operated the L-39 Albatros since 2004 and offers flights in Florida and California, near Sydney in Australia, in Tauranga in New Zealand, and in Switzerland, Czechia and the Italian Alps. The passenger sits in the raised rear seat with a panoramic view through the bubble canopy. See the <a href=\"https:\/\/migflug.com\/l-39-albatros\/\">L-39 flight<\/a> page for details.<\/div><\/details><\/div><\/section>\r\n\r\n\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is the difference between a turbojet and a turbofan?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"In a turbojet, all the air entering the intake passes through the compressor, combustor and turbine and leaves as a fast, hot jet. A turbofan uses extra turbine stages to drive a fan, and part of the air bypasses the core. Moving more air more slowly makes the turbofan quieter and much more fuel efficient at subsonic speeds.\"}},{\"@type\":\"Question\",\"name\":\"What is the bypass ratio of a jet engine?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The bypass ratio is the mass of air flowing around the engine core divided by the mass flowing through it. A turbojet has a ratio of zero, fighter engines such as the Eurojet EJ200 about 0.4:1, the L-39\u2019s Ivchenko AI-25TL 2:1, and modern airliner engines such as the GE9X about 10:1 or more.\"}},{\"@type\":\"Question\",\"name\":\"Why do airliners use high-bypass turbofans?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Airliners use high-bypass turbofans because accelerating a large mass of air a little is more efficient than accelerating a small mass of air a lot. The slower exhaust wastes less energy, which cuts fuel burn, and it is much quieter. On engines like the GE9X, the fan produces the vast majority of the thrust.\"}},{\"@type\":\"Question\",\"name\":\"Why do fighter jets use low-bypass turbofans?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Fighter jets need high thrust from a small frontal area and must keep accelerating at supersonic speed, where a big fan would add drag and lose thrust. Low-bypass turbofans such as the Eurofighter Typhoon\u2019s EJ200, with a 0.4:1 bypass ratio, combine reasonable cruise economy with an afterburner for take-off and combat.\"}},{\"@type\":\"Question\",\"name\":\"Why are turboprops used on short routes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Turboprops are very efficient at lower speeds because the propeller moves a huge mass of air gently, giving bypass ratios of around 50 to 100. On short regional routes a jet saves only minutes. 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When the L-39 first flew on 4 November 1968, it became the first trainer aircraft in the world to be powered by a turbofan engine.\"}},{\"@type\":\"Question\",\"name\":\"Can I fly in an L-39?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. MiGFlug has operated the L-39 Albatros since 2004 and offers flights in Florida and California, near Sydney in Australia, in Tauranga in New Zealand, and in Switzerland, Czechia and the Italian Alps. The passenger sits in the raised rear seat with a panoramic view through the bubble canopy. See the L-39 flight page for details.\"}}]}<\/script><div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\"><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\/how-does-a-jet-engine-work\/\">How Does a Jet Engine Work?<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/fadec-full-authority-digital-engine-control-explained\/\">FADEC Explained: The Computer That Really Runs a Jet Engine<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/compressor-stall-jet-engine-surge-explained\/\">Compressor Stall: Why a Jet Engine Coughs Fire<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/vickers-viscount-first-turboprop-airliner-history\/\">Vickers Viscount: The World&rsquo;s First Turboprop Airliner<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Turbojet vs turbofan vs turboprop: the same gas turbine core, spent four different ways. Bypass ratio, propulsive efficiency and why fighters, airliners and the L-39 chose differently.<\/p>","protected":false},"author":23,"featured_media":29615118,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665],"tags":[],"class_list":["post-29615409","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Turbojet vs Turbofan vs Turboprop Explained | MiGFlug<\/title>\n<meta name=\"description\" content=\"Turbojet vs turbofan vs turboprop explained: bypass ratio, propulsive efficiency, and why airliners, fighters and the L-39 use different engines.\" \/>\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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