{"id":31773937,"date":"2026-11-08T11:04:09","date_gmt":"2026-11-08T10:04:09","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/multi-engine-rating-vmc-minimum-control-speed-critical-engine-explained\/"},"modified":"2026-11-08T11:13:42","modified_gmt":"2026-11-08T10:13:42","slug":"multi-engine-rating-vmc-minimum-control-speed-critical-engine-explained","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/fr\/multi-engine-rating-vmc-minimum-control-speed-critical-engine-explained\/","title":{"rendered":"Multi-Engine Rating and VMC: Why a Twin Can Bite on One Engine"},"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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Lose one, keep flying on the other. That is the reason many pilots give for wanting a multi-engine rating, and it is only half true. On a typical light twin, losing one engine costs you half your power, and according to the FAA&rsquo;s Airplane Flying Handbook that reduces climb performance by 80 to 90 percent, sometimes more.<\/p>\r\n\r\n<p>The other half of the problem is worse. The good engine is now pulling from one side of the aircraft only, and it wants to swing the nose towards the dead one. Below a certain airspeed, the rudder simply cannot stop it. That airspeed has a name, a red line on the airspeed indicator and a starring role in every multi-engine checkride: V<sub>MC<\/sub>.<\/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>What it is:<\/strong> A multiengine class rating, required to fly aeroplanes with more than one engine<\/li><li style=\"margin:4px 0\"><strong>Key speed:<\/strong> V<sub>MC<\/sub>: minimum control speed with the critical engine inoperative (red radial line)<\/li><li style=\"margin:4px 0\"><strong>Blue line:<\/strong> V<sub>YSE<\/sub>: best rate of climb with one engine inoperative<\/li><li style=\"margin:4px 0\"><strong>Certification limit:<\/strong> Straight flight with no more than 5&deg; of bank; turn stopped within 20&deg; of heading<\/li><li style=\"margin:4px 0\"><strong>Critical engine:<\/strong> Left engine on twins with clockwise-turning propellers; none on counter-rotating designs such as the Seminole and Seneca<\/li><li style=\"margin:4px 0\"><strong>Cost of one engine:<\/strong> Half the power, 80 to 90 percent of the climb performance (FAA)<\/li><li style=\"margin:4px 0\"><strong>Checkride task:<\/strong> Engine inoperative, loss of directional control demonstration (V<sub>MC<\/sub> demo)<\/li><\/ul><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">What a multi-engine rating actually is<\/h2>\r\n\r\n<p>In FAA terms, flying a light twin requires a multiengine class rating on top of a pilot certificate. Much of the training revolves around one scenario: what to do, and how fast, when an engine quits. Most schools teach it in purpose-built trainers such as the Piper PA-44 Seminole, which Wikipedia notes is used primarily for multi-engine flight training, or the larger Piper PA-34 Seneca.<\/p>\r\n\r\n<p>On the practical test, the candidate has to fly an &ldquo;engine inoperative, loss of directional control demonstration&rdquo;, which the FAA handbook says is often referred to as a V<sub>MC<\/sub> demonstration. Understanding what V<sub>MC<\/sub> means, and what moves it, is the core of the rating.<\/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 performance and systems redundancy of a multiengine airplane is a safety advantage only to a trained and proficient pilot.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>FAA Airplane Flying Handbook<\/strong> &mdash; Chapter on transition to multiengine airplanes<\/div><\/div><\/div>\r\n\r\n\r\n<p>The handbook lists three major accident factors when flying on one engine at low altitude and low airspeed, such as just after take-off: loss of directional control, loss of performance and loss of flying speed. It adds that all three have equal potential to be lethal.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">V<sub>MC<\/sub>: the speed where the rudder runs out<\/h2>\r\n\r\n<p>V<sub>MC<\/sub> is the minimum control speed with the critical engine inoperative. In certification, it is the sea-level calibrated airspeed at which a test pilot, after the critical engine is suddenly made inoperative, can keep control and then hold straight flight at the same speed with no more than 5&deg; of bank.<\/p>\r\n\r\n<p>Under the small-aeroplane certification rules described in the handbook, the pilot must stop the resulting turn within 20&deg; of the original heading using maximum rudder and no more than 5&deg; of bank. Crucially, there is no requirement that the aircraft can climb at V<sub>MC<\/sub>. It is a control speed, not a performance speed.<\/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\/11\/multiengine-airspeed-indicator-vmc-red-line-vyse-blue-line-faa.jpg\" alt=\"An airspeed indicator for a light twin showing a red radial line for VMC near 80 knots and a blue radial line for VYSE near 100 knots\" 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\">Airspeed indicator markings for a multiengine aeroplane: the red radial line marks V<sub>MC<\/sub>, the blue radial line marks V<sub>YSE<\/sub>. FAA Airplane Flying Handbook, Figure 12-1 \/ public domain<\/figcaption><\/figure>\r\n\r\n\r\n<p>That is why the airspeed indicator of a light twin carries two extra marks. The red radial line is V<sub>MC<\/sub>. The blue radial line is V<sub>YSE<\/sub>, the best rate-of-climb speed with one engine inoperative, the speed you want if an engine fails after take-off. There is also V<sub>SSE<\/sub>, the safe intentional one-engine-inoperative speed, the minimum at which an instructor may deliberately shut down or simulate failure of the critical engine.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Why one engine is more critical than the other<\/h2>\r\n\r\n<p>On most twins, both propellers turn clockwise as seen from the pilot&rsquo;s seat. At positive angles of attack, the descending blade of each propeller produces more thrust than the ascending blade, the familiar P-factor. On the right engine, that descending blade sits farther from the aircraft&rsquo;s centre of gravity, so it has a longer lever arm.<\/p>\r\n\r\n<p>If the left engine fails, the right engine&rsquo;s thrust acts on that longer arm and produces the bigger yawing moment. That makes the left engine the critical engine: the one whose failure has the most adverse effect on directional control. Published V<sub>MC<\/sub> is measured with that engine out.<\/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\/VcEg39NmxY4\" 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\">Flight instructor Martin Pauly explains V<sub>MC<\/sub> and the minimum control speed demonstration in multi-engine training.<\/p>\r\n\r\n<p>Designers have a neat fix. The Seminole and Seneca both use a right-hand engine that turns the opposite way, a counter-rotating arrangement that Wikipedia says eliminates the critical engine. With counter-rotating propellers, the FAA handbook notes, the asymmetric thrust is the same whichever engine fails. The <a href=\"https:\/\/migflug.com\/aircraft\/p-38-lightning\/\">P-38 Lightning<\/a> fighter of the Second World War also had counter-rotating propellers, turning outward at the top of the arc.<\/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\/11\/piper-pa-44-seminole-counter-rotating-trainer-vh-tay.jpg\" alt=\"A Piper PA-44-180 Seminole of the Australian Airline Pilot Academy taxiing at Wagga Wagga Airport\" 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 Piper PA-44-180 Seminole of the Australian Airline Pilot Academy at Wagga Wagga. The Seminole&rsquo;s counter-rotating right engine removes the critical engine. Photo: Bidgee \/ CC BY-SA 3.0 AU<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">The number on the dial is not the number in the sky<\/h2>\r\n\r\n<p>The red line is a single figure, but the handbook stresses that real V<sub>MC<\/sub> changes with conditions. The published value is determined under a precise, deliberately unfavourable set of conditions: maximum available take-off power on the operating engine, the critical engine&rsquo;s propeller windmilling in the take-off position unless an autofeather system is fitted, the most unfavourable weight and the aft-most centre of gravity, landing gear up, flaps and cowl flaps in the take-off position, trimmed for take-off, out of ground effect and with up to 5&deg; of bank towards the operating engine.<\/p>\r\n\r\n<p>Each of those factors moves V<sub>MC<\/sub>. More power on the good engine raises it. A windmilling propeller adds drag on the dead side and raises it; feathering the propeller removes most of that drag. An aft centre of gravity shortens the rudder&rsquo;s lever arm and raises it. Retracting the gear raises it, because extended gear aids directional stability. Counter-intuitively, V<sub>MC<\/sub> also increases as weight is reduced.<\/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;The multiengine pilot must understand that VMC is not a fixed airspeed under all conditions.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>FAA Airplane Flying Handbook<\/strong> &mdash; On the engine inoperative, loss of directional control demonstration<\/div><\/div><\/div>\r\n\r\n\r\n<p>Bank angle is the most sensitive of all. Banking towards the good engine lets a component of lift help the rudder. According to the handbook, tests have shown V<sub>MC<\/sub> may rise by more than 3 knots for every degree of bank less than 5&deg;. Fly wings-level with a failed engine and the real minimum control speed can sit well above the red line.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">When V<sub>MC<\/sub> meets the stall<\/h2>\r\n\r\n<p>Altitude adds a twist. With normally aspirated engines, V<sub>MC<\/sub> is highest at take-off power at sea level and falls as the aircraft climbs, because the good engine produces less power in thinner air. Turbocharged engines hold take-off power, and so V<sub>MC<\/sub>, up to their critical altitude. The indicated stall speed, meanwhile, stays roughly where it is. At some altitude the two meet.<\/p>\r\n\r\n<p>That is the dangerous corner of the envelope. The handbook warns that if the stall arrives at or before V<sub>MC<\/sub>, the departure from controlled flight may be sudden, with strong yaw and roll towards inverted and a spin entry. No multi-engine aeroplane is approved for spins, and their recovery characteristics are generally very poor.<\/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\/11\/piper-pa-34-seneca-iii-flight-training-ec-iim.jpg\" alt=\"A Piper PA-34-220T Seneca III twin of Flight Training Europe on approach with gear extended\" 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 Piper PA-34-220T Seneca III of Flight Training Europe. Like the Seminole, the Seneca uses counter-rotating engines and is widely used for multi-engine training. Photo: Curimedia \/ CC BY 2.0<\/figcaption><\/figure>\r\n\r\n\r\n<p>Hence the rules for training. The handbook says pilots should never demonstrate V<sub>MC<\/sub> with an engine cut from high power and never intentionally fail an engine below V<sub>SSE<\/sub>. The demonstration is flown high, planned so it can be completed at least 3,000 feet above ground, and at the first sign of uncontrollable yaw or a stall, the recovery is to retard the operating engine&rsquo;s throttle enough to stop the yaw while lowering the nose.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Flying the failure: zero sideslip<\/h2>\r\n\r\n<p>Once control is assured, the goal is performance. A twin flying on one engine climbs best at zero sideslip, which for a typical light twin the handbook puts at about 2&deg; of bank towards the operating engine, with the slip ball displaced one-third to one-half towards the operating engine. More bank than that adds drag and eats the little climb you have left.<\/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\/yxX-S3NXytI\" 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\">The AOPA Air Safety Institute&rsquo;s Taming the Twin introduction to multiengine aeroplanes.<\/p>\r\n\r\n<p>The airline world solved the same problem with bigger numbers and stricter rules, as Afterburner explained in <a href=\"https:\/\/migflug.com\/afterburner\/etops-explained-engines-turn-or-passengers-swim\/\">Engines Turn or Passengers Swim<\/a>. Burt Rutan attacked it from another angle with an aircraft deliberately built asymmetric: <a href=\"https:\/\/migflug.com\/afterburner\/rutan-boomerang-asymmetric-twin-engine-out-safety\/\">The Rutan Boomerang: Built Lopsided on Purpose<\/a>.<\/p>\r\n\r\n<p>The multi-engine rating is not hard because twins are hard to fly. With both engines running, they are often easier. It is hard because the one moment that matters arrives without warning, close to the ground, at low speed. Keep the speed above the red line, fly the blue line, and a second engine really does become what it promises to be.<\/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\/KV5HGh0QJfQ\" 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 V<sub>MC<\/sub> demonstration flown in a Diamond DA42 twin trainer.<\/p>\r\n\r\n\r\n\r\n<p><em>Sources: FAA Airplane Flying Handbook (Transition to Multiengine Airplanes), Wikipedia (Critical engine; Piper PA-44 Seminole; Piper PA-34 Seneca), AOPA Air Safety Institute<\/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 VMC in a multi-engine aircraft?<\/summary><div class=\"a\">VMC is the minimum control speed with the critical engine inoperative. In certification it is the speed at which, after the critical engine suddenly fails, the pilot can keep control and hold straight flight with no more than 5 degrees of bank. It is marked with a red radial line on most airspeed indicators of light twins.<\/div><\/details><details><summary>What is the critical engine on a twin-engine aircraft?<\/summary><div class=\"a\">The critical engine is the engine whose failure has the most adverse effect on directional control. On twins whose propellers both turn clockwise as seen from the pilot&rsquo;s seat, it is the left engine, because P-factor gives the right engine&rsquo;s thrust a longer lever arm. Counter-rotating designs such as the Piper Seminole have no critical engine.<\/div><\/details><details><summary>What do the red and blue lines on a twin airspeed indicator mean?<\/summary><div class=\"a\">On a light twin, the red radial line marks VMC, the minimum control speed with the critical engine inoperative. The blue radial line marks VYSE, the best rate-of-climb speed with one engine inoperative. Above the single-engine ceiling, VYSE gives the minimum rate of sink.<\/div><\/details><details><summary>What makes VMC higher or lower?<\/summary><div class=\"a\">According to the FAA Airplane Flying Handbook, VMC rises with more power on the operating engine, a windmilling propeller, an aft centre of gravity, lower weight, retracted landing gear and less bank toward the operating engine. It falls with altitude on normally aspirated engines. Tests showed VMC can rise more than 3 knots per degree of bank below 5 degrees.<\/div><\/details><details><summary>Why is a VMC demonstration dangerous?<\/summary><div class=\"a\">At higher altitudes VMC drops toward the stall speed. If the aircraft stalls at or before VMC with asymmetric power, the FAA warns the departure from controlled flight can be sudden, with a spin entry. No multi-engine aeroplane is approved for spins, so the demonstration is flown high and recovered by reducing power and lowering the nose.<\/div><\/details><details><summary>How much performance does a twin lose with one engine out?<\/summary><div class=\"a\">Losing one engine on a light twin removes 50 percent of the power, but the FAA Airplane Flying Handbook says it reduces climb performance by 80 to 90 percent, sometimes more. The remaining thrust is also asymmetric, which creates the directional control problem that VMC describes.<\/div><\/details><details><summary>Which aircraft are used for multi-engine training?<\/summary><div class=\"a\">Common multi-engine trainers include the Piper PA-44 Seminole and the Piper PA-34 Seneca. Both use a counter-rotating right engine, which removes the critical engine and makes the aircraft more controllable with either engine out. Diamond DA42 twins are also used for training and VMC demonstrations.<\/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 VMC in a multi-engine aircraft?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"VMC is the minimum control speed with the critical engine inoperative. In certification it is the speed at which, after the critical engine suddenly fails, the pilot can keep control and hold straight flight with no more than 5 degrees of bank. It is marked with a red radial line on most airspeed indicators of light twins.\"}},{\"@type\":\"Question\",\"name\":\"What is the critical engine on a twin-engine aircraft?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The critical engine is the engine whose failure has the most adverse effect on directional control. 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Diamond DA42 twins are also used for training and VMC demonstrations.\"}}]}<\/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\/rutan-boomerang-asymmetric-twin-engine-out-safety\/\">The Rutan Boomerang: Built Lopsided on Purpose<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/etops-explained-engines-turn-or-passengers-swim\/\">Engines Turn or Passengers Swim<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/hour-building-cost-1250-hours-atp-cfi-time-building\/\">Hour Building to the ATP: What 1,250 Flight Hours Cost<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/tailwheel-endorsement-taildragger-61-31-i-ground-loop-explained\/\">Tailwheel Endorsement: What It Takes to Fly a Taildragger<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>A multi-engine rating centres on VMC, the minimum control speed with the critical engine out. What the red line means and what moves it.<\/p>","protected":false},"author":23,"featured_media":31773817,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665],"tags":[],"class_list":["post-31773937","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 v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Multi-Engine Rating and VMC Explained | MiGFlug<\/title>\n<meta name=\"description\" content=\"Multi-engine rating explained: what VMC means, why the left engine is critical, what the red and blue lines mark and why one engine out can bite.\" \/>\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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