{"id":2559,"date":"2015-03-21T13:12:11","date_gmt":"2015-03-21T13:12:11","guid":{"rendered":"http:\/\/www.migflug.com\/jetflights\/?p=2559"},"modified":"2026-09-04T09:47:49","modified_gmt":"2026-09-04T07:47:49","slug":"how-g-force-works","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/how-g-force-works\/","title":{"rendered":"How G-Force works"},"content":{"rendered":"<iframe loading=\"lazy\" hcb-fetch-image-from=\"https:\/\/youtu.be\/6-AP4z47EeE\" title=\"F18 - Flight Baptism - Are you with me Steve?\" width=\"1080\" height=\"810\" src=\"https:\/\/www.youtube.com\/embed\/6-AP4z47EeE?feature=oembed\"  allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\r\n<p align=\"left\">Watching films like\u00a0<a title=\"Our favorite military aviation films!\" href=\"https:\/\/www.migflug.com\/afterburner\/our-favorite-military-aviation-films.html\"><em>Top Gun <\/em>or\u00a0<em>Operation: Red Flag<\/em><\/a>\u00a0the\u00a0appeal of being a fighter jet pilot, is easily seen, but would the famous actor Tom Cruise have made a real fighter pilot, let alone\u00a0you or me? The cockpit of a fighter plane is a very restricted and highly hostile environment.<\/p>\r\n<iframe loading=\"lazy\" hcb-fetch-image-from=\"https:\/\/youtu.be\/mRAl-deRBOI\" title=\"How G-Suits Work to Keep Pilots Alive (And Why They are Getting Upgraded Again)\" width=\"1080\" height=\"608\" src=\"https:\/\/www.youtube.com\/embed\/mRAl-deRBOI?feature=oembed\"  allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\r\n\r\nDue\u00a0to the high altitudes at which they may fly there is little naturally available oxygen and the outside temperature is very low.\u00a0It's about 40 to 60 degrees below zero celsius. The movement of the plane can result in severe motion sickness, and the forces produced\u00a0on to the body by one of the most advanced aerobatic aircraft in the world is very dangerous and literally crushing.\r\n\r\n<iframe loading=\"lazy\" hcb-fetch-image-from=\"https:\/\/youtu.be\/mRAl-deRBOI\" title=\"How G-Suits Work to Keep Pilots Alive (And Why They are Getting Upgraded Again)\" width=\"1080\" height=\"608\" src=\"https:\/\/www.youtube.com\/embed\/mRAl-deRBOI?feature=oembed\"  allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\r\n\r\nG-force is an instant killer. In fact, the effects of g-force was, as long ago as the Second World War, causing the death of pilots who either lost consciousness or were unable to quickly bail\u00a0out of their planes.\r\n\r\n<a href=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2015\/03\/g-force-at-work.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-2657\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2015\/03\/g-force-at-work.jpg\" alt=\"g-force at work\" width=\"500\" height=\"387\" srcset=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2015\/03\/g-force-at-work.jpg 500w, https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2015\/03\/g-force-at-work-300x232.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/a>The 'g' in g-force refers to the word 'gravity', the force currently allowing you to simply sit down and read this article, and while the force has little to do with gravity, it provides an easily \u00a0understandable measurement of what g-force really is - essentially acceleration. Most people think of acceleration as an increase in speed.\r\n\r\nThis is how the word is generally used when thinking about cars and motorbikes, but in purely scientific terms acceleration is a change in velocity (change in speed and\/or direction). It's weird to think that a car that is slowing down or braking\u00a0or turning a corner is really and truly\u00a0accelerating if the word was used in its scientific sense.\r\n\r\nWe measure the force we feel as we accelerate in multiples of gravity - g's. The force you feel under the influence of gravity is 1g. Put simply, if you were to weigh 80kg (average weight of a man) then at 1g\u00a0you will still weigh 80kg. That's why, on the moon, you weigh less than when on earth, because there isn't gravity. In most people's day-to-day life they may feel a very small\u00a0'\u00a0g\u00a0' force when accelerating hard, cornering or braking in a car, but that's nothing when comparing to the average 6g during an aerobatic manoeuvre.\u00a0In an\u00a0Extra 300 stunt plane, Zeron and I experienced 6.5<em>g<\/em>, with quite a fast onset, but only for a few seconds. If we were to go out and play with the big boys in their <a href=\"https:\/\/migflug.com\/aircraft\/f-16-fighting-falcon\">F-16s<\/a> we would have to endure over 9<em>g<\/em>\u00a0for as long as ten or twenty seconds.\u00a0All objects exert a gravitational force over one another and this force is unique because it can act over very large distances. On and near the planet Earth, the gravitational force of our planet is so great due to Earth\u2019s large mass that all other gravitational forces are essentially\u00a0negligible. This force has been calculated to be approximately 9.82 m\/s2, and is often called \u2018g\u2019, as you likely recall from high school physics class. It is important to note that in accordance with Newton\u2019s Second Law of Motion,\u00a0<strong>F = ma<\/strong>, gravitational force is intimately tied to an object\u2019s mass and varies in direct proportion to this value. For example, gravity on the moon (a much less massive object than earth) is only 1.62 m\/s2. When the lift of an aircraft is greater than the force of gravity, controlled flight becomes possible as the Wright Brothers demonstrated to the world in 1903. Gravitational force is the reason why objects drop to the surface of the earth, and is also the force that an aircraft\u2019s airfoils must contend with to create\u00a0lift. When the lift of an aircraft is greater than the force of gravity, controlled flight becomes possible as the Wright Brothers demonstrated to the world in 1903. On a normal flight, at take off the g force is around 0.4g.\r\n\r\n\r\n\r\nSome terms are -\r\n\r\n<strong>Grey-out<\/strong> \u2014 Loss of peripheral vision (also referred to as tunnel vision) with loss of colour perception, and no loss of consciousness, The pilot can still hear, feel, and think. Recovery time two to three seconds after release of positive G force.\r\n\r\n<strong>Blackout<\/strong> \u2014 Complete loss of eyesight, no loss of consciousness. Pilot can hear, feel, and think. Recovery time two to three seconds after release of positive G force.\r\n\r\n<strong>L.O.C.<\/strong> \u2014 Loss of consciousness. The subject cannot hear, feel, think, or function. Frequently accompanied by seizure activity and\/or loss of bladder and bowel control. Recovery does not occur on the average for 15 to 20 seconds after the G force is terminated. The time required to return to consciousness may vary from nine to 20 seconds, and the subject does not re- turn to normal function for several minutes. Very dangerous.\r\n\r\n<strong>+ G<\/strong> \u2014 Positive G forces exerted through the vertical axis of the body. The effect of positive G loading (\u00b1 G is a function of the G load, the time exposed to the G load, and the rate at which the G load is produced.\r\n\r\n\r\n\r\n[CSSBUTTON target=\"https:\/\/www.migflug.com\/jet-fluege\/flugzeuge\/l-39-albatros.html\" color=\"#F22F2C\"]Want to experience some Gs yourself?[\/CSSBUTTON]\r\n\r\n&nbsp;\r\n\r\nAdditional Readings -\r\n<ul>\r\n\t<li><a title=\"Our favorite military aviation films!\" href=\"https:\/\/www.migflug.com\/afterburner\/our-favorite-military-aviation-films.html\">Our Favourite Aviation Films<\/a><\/li>\r\n\t<li><a title=\"MiG-25, The Original Soviet Rat Rod\" href=\"https:\/\/www.migflug.com\/afterburner\/mig-25-the-original-soviet-rat-rod.html\">The MiG-25<\/a><\/li>\r\n\t<li><a title=\"What exactly is a fighter jock?\" href=\"https:\/\/www.migflug.com\/afterburner\/what-exactly-is-a-fighter-jock.html\">What it's like to be a pilot<\/a><\/li>\r\n<\/ul>\r\nAuthor - Jake Meilak\r\n\r\n&nbsp;\r\n\r\n&nbsp;\r\n\r\n&nbsp;\r\n\r\n&nbsp;\n\n<!-- mf-faq -->\n\n<div class=\"mf-faq-block\"><style>.mf-faq-block{margin:34px 0}.mf-faq-item:not([open]) .mf-faq-answer{display:none !important}.mf-faq-block h2.mf-faq-h{padding-top:22px;margin-bottom:14px}.mf-faq-item{border:1px solid #e2e8f5;border-radius:8px;margin:0 0 10px;background:#fff}.mf-faq-item summary{list-style:none;cursor:pointer;padding:15px 50px 15px 18px;font-weight:600;color:#1a1a1a;position:relative;line-height:1.45;user-select:none}.mf-faq-item summary::-webkit-details-marker{display:none}.mf-faq-item summary::after{content:\"+\";position:absolute;right:18px;top:50%;transform:translateY(-50%);font-size:1.5em;font-weight:400;color:#5C91FF;line-height:1}.mf-faq-item[open] summary::after{content:\"\\2013\"}.mf-faq-item[open] summary{border-bottom:1px solid #eef1f8}.mf-faq-item summary:hover{background:#f5f8ff}.mf-faq-answer{padding:14px 18px;color:#333;line-height:1.6}.mf-faq-answer 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At rest you feel 1g, equal to your normal weight. Although the term references gravity, it actually measures acceleration, any change in speed or direction. Earth's gravitational acceleration is about 9.82 metres per second squared. Read about <a href=\"https:\/\/migflug.com\/afterburner\/what-pulling-9g-does-to-your-body-fighter-jet-g-forces-physiology\/\">what 9G does to your body<\/a>.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>How many Gs can a fighter pilot experience?<\/summary><div class=\"mf-faq-answer\"><p>Fighter pilots can endure very high G-loads. A typical aerobatic manoeuvre pulls around 6g, while an F-16 dogfight can sustain over 9g for ten to twenty seconds. By comparison, a normal airliner take-off is only about 0.4g, showing how extreme fighter G-forces really are.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>What are greyout, blackout and G-LOC?<\/summary><div class=\"mf-faq-answer\"><p>These are stages of G-force effects on the body. Greyout is loss of peripheral vision and colour while still conscious. Blackout is complete loss of sight, again without losing consciousness. G-LOC, G-induced loss of consciousness, is a full blackout often accompanied by seizures, and is extremely dangerous in flight.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>Why is G-force dangerous for pilots?<\/summary><div class=\"mf-faq-answer\"><p>High sustained G-force pulls blood away from the brain, starving it of oxygen and causing vision loss or unconsciousness. It has killed pilots since World War II when they blacked out or could not bail out in time. Pilots counter it with G-suits and straining techniques that keep blood in the upper body.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>What does the 'g' in g-force stand for?<\/summary><div class=\"mf-faq-answer\"><p>The \"g\" in g-force stands for gravity. It is used as a convenient unit: 1g equals the force you feel from Earth's gravity at rest. The measure describes acceleration in general, so even a turning or braking vehicle is \"accelerating\" and producing G-forces in the scientific sense.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>What is G-LOC?<\/summary><div class=\"mf-faq-answer\"><p>G-LOC stands for G-induced loss of consciousness. It occurs when sustained high G-forces drain blood from the brain, causing temporary unconsciousness, often with seizure activity. It is a leading danger in high-performance flight, which is why pilots train in centrifuges and wear G-suits.<\/p><\/div><\/details><\/div>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is G-force?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"G-force is a measure of acceleration expressed in multiples of Earth's gravity. At rest you feel 1g, equal to your normal weight. Although the term references gravity, it actually measures acceleration, any change in speed or direction. Earth's gravitational acceleration is about 9.82 metres per second squared. 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It is a leading danger in high-performance flight, which is why pilots train in centrifuges and wear G-suits.\"}}]}<\/script><!-- \/mf-faq -->\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","protected":false},"excerpt":{"rendered":"<p>Watching films like\u00a0Top Gun or\u00a0Operation: Red Flag\u00a0the\u00a0appeal of being a fighter jet pilot, is easily seen, but would the famous actor Tom Cruise have made a real fighter pilot, let alone\u00a0you or me? The cockpit of a fighter plane is a very restricted and highly hostile environment. Due\u00a0to the high altitudes at which they may [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":647581,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[5,7,667,664],"tags":[73,74,243,255,434,439,478,611],"class_list":["post-2559","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fighter-flights","category-fighter-jets","category-inside-migflug","category-military-aviation","tag-avgeeks","tag-aviation","tag-g-force","tag-gravity","tag-physics","tag-planes","tag-science","tag-wwii"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How G-Force Works - Effects on Fighter Jet Pilots<\/title>\n<meta name=\"description\" content=\"Learn how G-force affects fighter jet pilots, from grey-out and blackout to G-LOC. 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