{"id":22327166,"date":"2026-09-14T17:25:30","date_gmt":"2026-09-14T15:25:30","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/how-does-an-aircraft-fly-four-forces-lift-explained\/"},"modified":"2026-09-14T17:30:57","modified_gmt":"2026-09-14T15:30:57","slug":"how-does-an-aircraft-fly-four-forces-lift-explained","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/es\/how-does-an-aircraft-fly-four-forces-lift-explained\/","title":{"rendered":"How Does an Aircraft Fly? Lift, Weight, Thrust and Drag"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n\r\n<p>Almost everyone who has been told how a wing works has been told something wrong.<\/p>\r\n\r\n<p>The explanation goes like this: the top of the wing is curved and the bottom is flat, so air going over the top has further to travel, so it must go faster to meet up with the air underneath, and faster air has lower pressure, so the wing is sucked upwards. It appears in textbooks, museum displays and a great many flight-training courses.<\/p>\r\n\r\n<p>NASA has a page dedicated to explaining why it is wrong. The page is called \u201cIncorrect Lift Theory\u201d.<\/p>\r\n\r\n\r\n<div style=\"background:#f5f5f5;padding:20px 22px;margin:24px 0\"><p style=\"margin:0 0 10px;font-weight:700;font-size:17px;color:#1a1a1a\">Quick Facts<\/p><p style=\"margin:5px 0;font-size:15px;line-height:1.6\"><strong>The four forces:<\/strong> Lift, weight, thrust and drag<\/p><p style=\"margin:5px 0;font-size:15px;line-height:1.6\"><strong>Lift:<\/strong> Acts perpendicular to the direction of flight, through the centre of pressure<\/p><p style=\"margin:5px 0;font-size:15px;line-height:1.6\"><strong>Weight:<\/strong> Acts toward the centre of the Earth, through the centre of gravity<\/p><p style=\"margin:5px 0;font-size:15px;line-height:1.6\"><strong>Drag:<\/strong> Always directly opposed to the direction of flight<\/p><p style=\"margin:5px 0;font-size:15px;line-height:1.6\"><strong>Balanced forces:<\/strong> Constant velocity. Unbalanced forces produce acceleration toward the largest one<\/p><p style=\"margin:5px 0;font-size:15px;line-height:1.6\"><strong>What actually makes lift:<\/strong> Turning the airflow. The wing deflects air downward and gets pushed up in return<\/p><p style=\"margin:5px 0;font-size:15px;line-height:1.6\"><strong>Angle of attack:<\/strong> Lift varies almost linearly with it up to around 10 degrees, then the flow begins to separate<\/p><p style=\"margin:5px 0;font-size:15px;line-height:1.6\"><strong>Thin airfoil theory:<\/strong> Lift coefficient is approximately 2\u03c0 multiplied by the angle of attack in radians<\/p><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">The four forces<\/h2>\r\n\r\n<p>Start with the simple part, which is genuinely simple. Four forces act on an aircraft in flight.<\/p>\r\n\r\n<p><strong>Weight<\/strong> pulls toward the centre of the Earth and acts through the centre of gravity. <strong>Lift<\/strong> acts perpendicular to the direction of flight, through the centre of pressure. <strong>Drag<\/strong> acts directly against the direction of flight, also through the centre of pressure. <strong>Thrust<\/strong> acts in whatever direction the engines are pointed.<\/p>\r\n\r\n<p>If they balance, the aircraft continues at constant velocity. If they do not, it accelerates in the direction of the largest force. That is Newton\u2019s second law and there is nothing mysterious about it.<\/p>\r\n\r\n<p>Note one thing that trips people up: lift is defined relative to the flight path, not to the ground. In a steep turn, lift is not pointing upward. That is precisely why aircraft descend in turns unless the pilot does something about 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\/09\/airliner-wing-wind-tunnel-test-model.jpg\" alt=\"A model of an airliner wing used for wind tunnel testing\" 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 wing model in a wind tunnel. Predicting exactly where a wing stops making lift is, in NASA\u2019s words, very difficult mathematically, so engineers measure it. Photo: Wikimedia Commons, CC BY-SA 3.0.<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Why the equal transit story fails<\/h2>\r\n\r\n<p>NASA gives three separate reasons, and any one of them is fatal.<\/p>\r\n\r\n<p><strong>Symmetric wings make lift.<\/strong> A flat plate makes lift. A paper aeroplane has no curvature at all. If the upper surface having a longer path were the mechanism, none of these could work. Some modern low-drag airfoils actually have a <em>longer bottom<\/em> surface. And aircraft fly inverted, which under the equal-transit story should press them into the ground.<\/p>\r\n\r\n<p><strong>The premise is made up.<\/strong> There is no physical reason why two air molecules that separate at the leading edge must arrive at the trailing edge together. NASA calls it a non-physical assumption. Cambridge University filmed the experiment: pulses of smoke released upstream of a wing show that the air going over the top arrives at the trailing edge <em>first<\/em>, well ahead of the air underneath.<\/p>\r\n\r\n<p><strong>The numbers do not work.<\/strong> Even if you accept the premise, it gives the wrong answer.<\/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;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;The lift predicted by the \u201cEqual Transit\u201d theory is much less than the observed lift, because the velocity is too low.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Tom Benson<\/strong> &mdash; NASA Glenn Research Center, \u201cIncorrect Lift Theory\u201d, Beginner\u2019s Guide to Aeronautics<\/div><\/div><\/div>\r\n\r\n\r\n<p>It is worth being precise about what is wrong here, because the correction is often overstated in the other direction. Bernoulli\u2019s principle is not wrong. NASA says so explicitly. Faster-moving air really does have lower pressure. The error is in how the equal-transit story works out the speed.<\/p>\r\n\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\/UqBmdZ-BNig\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<p>The Cambridge smoke-pulse demonstration. Watch where the two pulses are when the upper one reaches the trailing edge.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">What actually happens<\/h2>\r\n\r\n<p>A wing makes lift by turning the air. That is the whole of it.<\/p>\r\n\r\n<p>The wing deflects the oncoming flow downward, and by Newton\u2019s third law the air pushes the wing upward by an equal and opposite amount. The downward-moving air behind a wing is called downwash, and you can see it: it is what makes helicopters kick up dust and what makes the wake behind a large aircraft dangerous.<\/p>\r\n\r\n<p>Crucially, both surfaces do the turning. The underside deflects air downward in the obvious way. But the upper surface also turns the flow downward, by curving it around and back down toward the trailing edge, and on a normal wing at a normal angle the upper surface does <em>more<\/em> of the work than the lower one. Leaving out the upper surface produces the other classic wrong explanation, the one where the wing works like a skipping stone.<\/p>\r\n\r\n<p>Pressure and velocity still matter. The air near the upper surface does move faster and its pressure is lower, and integrating that pressure distribution around the wing gives you the lift. Bernoulli is a perfectly good way to calculate the answer. It just is not the cause. The velocity differences exist <em>because<\/em> the flow is being turned.<\/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;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;In other words, it\u2019s the curvature that creates lift, not the distance.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Professor Holger Babinsky<\/strong> &mdash; Department of Engineering, University of Cambridge, \u201cHow wings really work\u201d, 25 January 2012<\/div><\/div><\/div>\r\n\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\/09\/nasa-piv-pitching-airfoil-dynamic-stall-scaled.jpg\" alt=\"Particle image velocimetry showing the flow over a pitching airfoil\" 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\">Particle image velocimetry over a pitching airfoil at NASA Glenn. Making the invisible visible is most of what aerodynamic research consists of. NASA photograph, public domain.<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Angle of attack does the steering<\/h2>\r\n\r\n<p>If lift comes from turning the flow, then the amount of turning is what controls the lift. That is the angle of attack: the angle between the wing\u2019s chord line and the oncoming air.<\/p>\r\n\r\n<p>Increase it and you turn more air, so you get more lift. The relationship is very nearly a straight line up to around ten degrees, which is why thin airfoil theory can say that the lift coefficient is roughly 2\u03c0 times the angle of attack in radians and be usefully accurate.<\/p>\r\n\r\n<p>Then the flow stops following the upper surface, separates, and the lift collapses. That is the stall, and predicting exactly when it happens is not something anyone can do reliably with equations alone. NASA\u2019s own guidance is that it is very difficult mathematically and that engineers rely on wind tunnels. That is why the photograph above exists.<\/p>\r\n\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\/p4VHMsIuPmk\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<p>A concise summary of the modern explanation, without the equal-transit myth.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">So why does the wrong version survive?<\/h2>\r\n\r\n<p>Because it is memorable, it involves a shape you can draw, and it produces a number that is in roughly the right direction. It gives people the feeling of understanding without requiring them to think about momentum.<\/p>\r\n\r\n<p>Babinsky has described starting lectures by giving the wrong explanation and asking who has heard it, and watching almost every hand in the room go up. That is not a failure of the audience. It is what happens when a tidy story outcompetes an accurate one for a century.<\/p>\r\n\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\/e0l31p6RIaY\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<p>The correct version is not much harder: a wing pushes air down, and the air pushes the wing up. Everything else, the pressure distribution, the curvature, the angle of attack, is detail about <em>how efficiently<\/em> it manages to do that.<\/p>\r\n\r\n<p><em>Sources: NASA Glenn Research Center, Beginner\u2019s Guide to Aeronautics, \u201cIncorrect Lift Theory\u201d, \u201cLift from Flow Turning\u201d, \u201cThe Four Forces\u201d and \u201cInclination Effects on Lift\u201d, by Tom Benson; University of Cambridge, \u201cHow wings really work\u201d, 25 January 2012.<\/em><\/p>\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 are the four forces of flight?<\/summary><div class=\"a\">Lift, weight, thrust and drag. Lift acts perpendicular to the direction of flight, weight toward the centre of the Earth, drag directly against the flight direction, and thrust in the direction the engines point. Balanced forces mean constant velocity.<\/div><\/details><details><summary>How does a wing actually create lift?<\/summary><div class=\"a\">By turning the airflow. The wing deflects air downward and, by Newton\u2019s third law, the air pushes the wing upward. Both the upper and lower surfaces contribute to the turning, and on a conventional wing the upper surface usually does more of it.<\/div><\/details><details><summary>Why is the equal transit time explanation of lift wrong?<\/summary><div class=\"a\">Because there is no physical reason air separating at the leading edge must meet again at the trailing edge, and it does not. Symmetric wings, flat plates and inverted flight all produce lift, which the theory cannot explain, and its predicted lift is far too small.<\/div><\/details><details><summary>Is Bernoulli\u2019s principle wrong then?<\/summary><div class=\"a\">No. NASA states explicitly that the Bernoulli relationship between velocity and pressure is correct. The error in the popular explanation is in how the air\u2019s velocity is worked out, not in the physics linking that velocity to pressure.<\/div><\/details><details><summary>What is angle of attack?<\/summary><div class=\"a\">The angle between the wing\u2019s chord line and the oncoming airflow. It controls how much the wing turns the air and therefore how much lift it makes. Lift rises almost linearly with angle of attack up to around ten degrees.<\/div><\/details><details><summary>What is downwash?<\/summary><div class=\"a\">The downward-moving air behind a wing, produced as the wing turns the flow. It is the visible consequence of the reaction that creates lift, and it is why helicopters raise dust and why wake turbulence behind large aircraft is dangerous.<\/div><\/details><details><summary>Can I experience this myself in a fighter jet?<\/summary><div class=\"a\">Yes. MiGFlug flies civilians in genuine military aircraft including the L-39 Albatros and the MiG-29 Fulcrum, with professional crews, where the relationship between angle of attack and G is rather more obvious than in a classroom. Details at <a href=\"https:\/\/migflug.com\/flights-prices\/\">migflug.com\/flights-prices<\/a>.<\/div><\/details><\/div><\/section>\r\n\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What are the four forces of flight?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Lift, weight, thrust and drag. Lift acts perpendicular to the direction of flight, weight toward the centre of the Earth, drag directly against the flight direction, and thrust in the direction the engines point. Balanced forces mean constant velocity.\"}},{\"@type\":\"Question\",\"name\":\"How does a wing actually create lift?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"By turning the airflow. The wing deflects air downward and, by Newton\u2019s third law, the air pushes the wing upward. Both the upper and lower surfaces contribute to the turning, and on a conventional wing the upper surface usually does more of it.\"}},{\"@type\":\"Question\",\"name\":\"Why is the equal transit time explanation of lift wrong?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Because there is no physical reason air separating at the leading edge must meet again at the trailing edge, and it does not. 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Details at migflug.com\/flights-prices.\"}}]}<\/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\/coffin-corner-aerodynamics-stall-mach-high-altitude\/\">The Corner of the Sky That Kills Both Ways<\/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\/how-does-a-jet-engine-work\/\">How Does a Jet Engine Work?<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Almost everyone has been taught the wrong explanation. NASA has a page devoted to why it is wrong. Here is what actually holds an aeroplane up.<\/p>","protected":false},"author":27,"featured_media":22323942,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665],"tags":[],"class_list":["post-22327166","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 v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How Does an Aircraft Fly? The Four Forces | MiGFlug<\/title>\n<meta name=\"description\" content=\"Almost everyone was taught the wrong explanation of lift. NASA has a page on why it is wrong. 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