{"id":18853348,"date":"2026-09-01T11:15:20","date_gmt":"2026-09-01T09:15:20","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/ground-effect-explained-induced-drag-landing-float\/"},"modified":"2026-09-04T08:43:23","modified_gmt":"2026-09-04T06:43:23","slug":"ground-effect-explained-induced-drag-landing-float","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/ground-effect-explained-induced-drag-landing-float\/","title":{"rendered":"Ground Effect: The Cushion of Air That Isn&rsquo;t Really There"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n<!-- mfsh:top -->\n\n<style>\n.mfsh-trigger{display:inline-flex;align-items:center;gap:10px;height:44px;padding:0 18px;margin:0 0 26px;border:2px solid #0F1720;background:#fff;color:#0F1720;font-family:inherit;font-size:14px;font-weight:700;line-height:1;letter-spacing:0;text-transform:none;cursor:pointer;box-shadow:none;transition:background 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The aeroplane is descending toward the runway, the flare begins, and somewhere in the last few feet the whole machine seems to change its mind about landing. It floats. It sits there, refusing to settle, eating runway.<\/p><p>The usual explanation is that a cushion of air has built up between the wing and the ground.<\/p><p>The FAA, in its own handbook, says that cushion does not exist.<\/p>\r\n<div style=\"background:#f5f5f5;padding:20px 22px;margin:26px 0;border-left:4px solid #5C91FF\"><p style=\"margin:0 0 10px;font-weight:700;font-size:17px;color:#222\">Quick Facts<\/p><table style=\"width:100%;border-collapse:collapse;font-size:15px;line-height:1.6\"><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>Where it starts<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">Within roughly one wingspan of the surface<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>Induced drag reduction at one wingspan<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">1.4%, which is to say almost nothing<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>At one quarter of a wingspan<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">23.5%<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>At one tenth of a wingspan<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">47.6%, close to half the induced drag gone<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>The real mechanism<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">The surface restricts the vertical component of airflow, weakening the wingtip vortices and reducing induced angle of attack<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>Entering ground effect<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">A nose-down change in pitching moment<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>Leaving ground effect<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">A nose-up change, with reduced stability<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>The instrument trap<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">Local static pressure rises, so airspeed and altitude can read low<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>Wing position<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">Low-wing aircraft receive the strongest effect<\/td><\/tr><\/table><\/div>\r\n<h2 style=\"padding-top:22px\">The numbers are steeper than most pilots think<\/h2><p>Ground effect is usually described as beginning within one wingspan of the surface, and that is correct as far as it goes. What the description hides is how brutally non-linear it is.<\/p>\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;When the wing is at a height equal to its span, the reduction in induced drag is only 1.4 percent. However, when the wing is at a height equal to one-fourth its span, the reduction in induced drag is 23.5 percent and, when the wing is at a height equal to one-tenth its span, the reduction in induced drag is 47.6 percent.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Federal Aviation Administration<\/strong> &mdash; Pilot&rsquo;s Handbook of Aeronautical Knowledge, FAA-H-8083-25C, 2023, Chapter 5<\/div><\/div><\/div>\r\n<p>At a full wingspan above the runway you have gained 1.4 per cent. Essentially nothing. The benefit arrives almost entirely in the last fraction of a wingspan, which for a light single means the final ten or fifteen feet and for a widebody means something rather more substantial.<\/p><p>Treat those three figures as the classic values rather than physical constants. The FAA&rsquo;s own two handbooks round them differently, one giving 23.5 and 47.6 per cent while the other says about 25 and about 50. Modern design texts using different approximations disagree further out from the ground. The shape of the curve is not in dispute; the third decimal place is.<\/p>\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\/embraer-praetor-500-short-final-ground-effect.jpg\" alt=\"Embraer Praetor 500 on short final approaching the runway\" 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 Embraer Praetor 500 on short final. The useful part of ground effect arrives in the last fraction of a wingspan, not gradually across the approach. Photo: Wikimedia Commons<\/figcaption><\/figure>\r\n<h2 style=\"padding-top:22px\">What is actually happening<\/h2><p>The cushion image is intuitive and wrong. Nothing is being compressed underneath the wing.<\/p><p>What the ground does is interfere with the three-dimensional flow pattern around the aircraft. The vertical component of airflow is restricted by the surface, which alters upwash, downwash and the wingtip vortices. Weaken the vortices and you reduce the induced angle of attack, and with it the induced drag. The wing behaves, in the classic formulation, as though it had a greater aspect ratio than it really has.<\/p><p>Same wing, same speed, less drag. That is the whole phenomenon.<\/p>\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\/GHQvAQiIcoE\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n<p>Rod Machado connects induced drag and ground effect above, which is the right order to learn them in.<\/p><h2 style=\"padding-top:22px\">Why it kills people on takeoff, not on landing<\/h2><p>The float is an annoyance. Excess speed at the flare, reduced drag, no power-off deceleration, and the aeroplane declines to stop flying. You use more runway than you meant to.<\/p><p>The takeoff case is the one that fills accident reports, because ground effect lets an aircraft fly before it is capable of flying.<\/p>\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;Pilots are often lulled into a sense of false security by the apparent cushion of air under the wings that initially assists in the transition from an approach descent to a climb. This cushion of air, however, is imaginary. The apparent increase in airplane performance is, in fact, due to a reduction in induced drag in the ground effect area. It is borrowed performance that is repaid when the airplane climbs out of the ground effect area.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Federal Aviation Administration<\/strong> &mdash; Airplane Flying Handbook, FAA-H-8083-3C, 2021, Chapter 9<\/div><\/div><\/div>\r\n<p>Borrowed performance repaid is exactly right. With half the induced drag gone, an aircraft can become airborne well below the speed at which it can actually climb. It rises a few feet, leaves ground effect, meets the drag it had been excused from, and settles back onto the runway or into whatever is beyond it. The FAA warns specifically about the combination of high gross weight, high density altitude and high temperature.<\/p><p>On 23 February 2017 a Beechcraft A36TC took off from Stevensville, Montana. The NTSB calculated the takeoff weight at 4,053 lb against a certificated maximum of 3,833 lb, with an 8.5-knot tailwind gusting to 11, on a runway sloping uphill at nearly two per cent. A witness saw the aircraft reach about fifty feet before a steep descending right turn into terrain. The probable cause was the decision to take off with a tailwind on an upsloping runway in an overweight aeroplane, which left it with insufficient energy to climb out of ground effect.<\/p>\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\/JP25m4SIrJI\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n<h2 style=\"padding-top:22px\">The two details that catch people out<\/h2><p><strong>It changes pitch, and in opposite directions.<\/strong> Entering ground effect produces a nose-down change in pitching moment, because reduced downwash at the tail requires more up elevator to trim. Leaving it produces a nose-up change and a reduction in stability. The handbooks look contradictory until you notice they are describing opposite events.<\/p>\r\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;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;For the conventional airplane configuration, encountering ground effect will produce a nose-down change in pitching moment.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Hugh H. Hurt Jr<\/strong> &mdash; Aerodynamics for Naval Aviators, NAVWEPS 00-80T-80, revised January 1965<\/div><\/div><\/div>\r\n<p><strong>It lies to your instruments.<\/strong> Ground effect usually increases local pressure at the static source, which makes the airspeed indicator and altimeter read low, and often drives the vertical speed indicator to show a descent. An aircraft can therefore be airborne at an indicated airspeed below what should be required, which is a genuinely unhelpful thing to discover at fifty feet with a hill ahead.<\/p>\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\/boeing-747-400-touchdown-tyre-smoke-sfo.jpg\" alt=\"Boeing 747-400 touching down with tyre smoke at San Francisco\" 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 747-400 at the moment of touchdown. On a widebody with a span approaching 200 ft, the ground-effect region is correspondingly deep. Photo: Wikimedia Commons<\/figcaption><\/figure>\r\n<p>Scale matters here. A twin-aisle airliner spans around 200 feet, so it is meaningfully in ground effect from a height where a light aircraft would notice nothing at all. Low-wing aircraft get the strongest effect, and the benefit is greatest over smooth, level, hard surfaces in calm air. Over grass, rough ground or water, expect considerably less.<\/p><h2 style=\"padding-top:22px\">Building an aircraft that never leaves it<\/h2><p>If the effect halves induced drag, the obvious question is why not stay in it permanently. The Soviet Union asked exactly that.<\/p>\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\/lun-class-ekranoplan-md-160-derbent.jpg\" alt=\"Lun-class ekranoplan MD-160 ashore at Derbent\" 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\">The Lun-class MD-160 at Derbent, where it was hauled ashore in December 2021. It remains the only ground-effect vehicle ever operationally deployed as a warship. Photo: Wikimedia Commons<\/figcaption><\/figure>\r\n<p>The Lun-class MD-160 carried six anti-ship missiles on the back of a 73-metre hull with a 44-metre span, entered service with the Caspian Flotilla in the late 1980s, and served as the only ground-effect vehicle ever fielded as a warship. Sources differ on its exact displacement and service date, which is characteristic of the whole programme.<\/p>\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\/yVdH_dYlVB8\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n<p>The economics never closed. A craft optimised to fly at five to ten metres cannot climb over weather, cannot use an airport, cannot easily be certificated as either ship or aircraft, and handles badly in the sea states where you would most want it. The International Maritime Organization eventually wrote guidelines splitting them into three types, the strictest of which must be physically incapable of exceeding the vertical extent of ground effect.<\/p><p>We have covered the ekranoplans in detail separately. The relevant point here is that the physics is real enough to build an aircraft around, and awkward enough that almost nobody has.<\/p><h2 style=\"padding-top:22px\">What to take away<\/h2><p>Ground effect is not a cushion and it is not free lift. It is a temporary reduction in induced drag that arrives in the last fraction of a wingspan and disappears just as abruptly.<\/p><p>On landing that buys you a float you did not ask for. On takeoff it can lend you flight you have not earned, and it always asks for the loan back at the least convenient moment.<\/p><p>The FAA&rsquo;s own word for it is the honest one: borrowed.<\/p>\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>\n\n\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>What is ground effect?<\/summary><div class=\"a\">The reduction in induced drag that occurs when a wing flies close to the surface, within roughly one wingspan. It is what makes an aircraft float in the flare instead of settling onto the runway.<\/div><\/details><details><summary>Is ground effect a cushion of air under the wing?<\/summary><div class=\"a\">No, and the FAA says so directly in its own handbook. The real mechanism is that the surface restricts the vertical component of airflow, which weakens the wingtip vortices and reduces the induced angle of attack. Nothing is being compressed underneath the aircraft.<\/div><\/details><details><summary>How strong is ground effect at different heights?<\/summary><div class=\"a\">It is brutally non-linear. At a height equal to the wingspan the induced drag reduction is only 1.4 percent, which is nothing. At one quarter of the span it is 23.5 percent, and at one tenth of the span it is 47.6 percent &mdash; close to half the induced drag gone.<\/div><\/details><details><summary>How does ground effect change the way an aircraft handles?<\/summary><div class=\"a\">Entering ground effect produces a nose-down change in pitching moment; leaving it produces a nose-up change with reduced stability. Low-wing aircraft experience the strongest effect.<\/div><\/details><details><summary>Can ground effect fool the instruments?<\/summary><div class=\"a\">Yes, and this is the trap. Local static pressure rises near the surface, so airspeed and altitude can both read low at exactly the moment a pilot is relying on them.<\/div><\/details><\/div><\/section>\n\n\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is ground effect?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The reduction in induced drag that occurs when a wing flies close to the surface, within roughly one wingspan. It is what makes an aircraft float in the flare instead of settling onto the runway.\"}},{\"@type\":\"Question\",\"name\":\"Is ground effect a cushion of air under the wing?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, and the FAA says so directly in its own handbook. The real mechanism is that the surface restricts the vertical component of airflow, which weakens the wingtip vortices and reduces the induced angle of attack. Nothing is being compressed underneath the aircraft.\"}},{\"@type\":\"Question\",\"name\":\"How strong is ground effect at different heights?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It is brutally non-linear. At a height equal to the wingspan the induced drag reduction is only 1.4 percent, which is nothing. At one quarter of the span it is 23.5 percent, and at one tenth of the span it is 47.6 percent \u2014 close to half the induced drag gone.\"}},{\"@type\":\"Question\",\"name\":\"How does ground effect change the way an aircraft handles?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Entering ground effect produces a nose-down change in pitching moment; leaving it produces a nose-up change with reduced stability. Low-wing aircraft experience the strongest effect.\"}},{\"@type\":\"Question\",\"name\":\"Can ground effect fool the instruments?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, and this is the trap. Local static pressure rises near the surface, so airspeed and altitude can both read low at exactly the moment a pilot is relying on them.\"}}]}<\/script><p><em>Sources: FAA Pilot&rsquo;s Handbook of Aeronautical Knowledge FAA-H-8083-25C; FAA Airplane Flying Handbook FAA-H-8083-3C; Hurt, Aerodynamics for Naval Aviators, NAVWEPS 00-80T-80; Wieselsberger, NACA Technical Memorandum 77 (1922); Raymer, Aircraft Design: A Conceptual Approach; NTSB WPR17LA064; IMO MSC.1\/Circ.1592; SKYbrary.<\/em><\/p>\n<!-- mfsh:bottom -->\n\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>\n\n<!-- \/mfsh:bottom -->\n\r\n<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\/caspian-sea-monster-ekranoplan\/\">The Caspian Sea Monster That Spooked the CIA<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/wake-turbulence-wingtip-vortices-separation-explained\/\">Wake Turbulence: The Invisible Tornado Behind Every Airliner<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/winglets-richard-whitcomb-nasa-wingtip-vortex-fuel-saving\/\">The Bent Wingtips That Save Billions in Fuel<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Why aircraft float on landing and can get airborne before they are able to climb. The real mechanism behind ground effect, the numbers, and why the FAA calls the cushion imaginary.<\/p>\n","protected":false},"author":27,"featured_media":18852762,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665],"tags":[],"class_list":["post-18853348","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 v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ground Effect: The Air Cushion That Is Not There | MiGFlug<\/title>\n<meta name=\"description\" content=\"Why aircraft float on landing and can lift off before they can climb. 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