{"id":4673,"date":"2026-06-12T10:11:01","date_gmt":"2026-06-12T02:11:01","guid":{"rendered":"https:\/\/pithrust.com\/?p=4673"},"modified":"2026-06-12T10:21:19","modified_gmt":"2026-06-12T02:21:19","slug":"drone-motor-kv-rating-explained-how-rpm-per-volt-actually-affects-thrust-efficiency-and-prop-choice","status":"publish","type":"post","link":"https:\/\/pithrust.com\/fr\/drone-motor-kv-rating-explained-how-rpm-per-volt-actually-affects-thrust-efficiency-and-prop-choice\/","title":{"rendered":"Tout ce qu'il faut savoir sur l'indice KV des moteurs de drones : comment le rapport tours par volt influe r\u00e9ellement sur la pouss\u00e9e, le rendement et le choix des h\u00e9lices"},"content":{"rendered":"
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Tout ce qu'il faut savoir sur l'indice KV des moteurs de drones : comment le rapport tours par volt influe r\u00e9ellement sur la pouss\u00e9e, le rendement et le choix des h\u00e9lices<\/h1>\r\n\r\n
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KV is not kilovolts. It's revolutions per minute per volt \u2014 and it affects everything from propeller selection to flight time.<\/figcaption>\r\n <\/figure>\r\n\r\n

A lot of people see \"380KV\" on a motor label and assume it's a power rating \u2014 like a bigger number means a stronger motor. It doesn't work that way. KV is RPM per volt, nothing else<\/strong>. Two motors can share the same KV and produce entirely different thrust because stator size, winding quality, and voltage all tell a bigger part of the story. We make seven brushless motors spanning 300KV to 900KV here at Pi Thrust, and we've tested every one on a static thrust stand. This guide explains what KV actually means, how it interacts with voltage and propeller size, and how to pick the right number for your specific build \u2014 whether you're lifting a LiDAR payload or racing through gates.<\/p>\r\n\r\n \r\n

What KV Actually Means \u2014 It's Not Kilovolts, It's Not Power, and It's Not Quality<\/h2>\r\n\r\n

KV stands for the velocity constant<\/strong> of a brushless motor. Specifically, it tells you how many RPM the motor will spin per volt applied \u2014 with no load (no propeller attached). A 380KV motor<\/strong> spins at 380 RPM for every volt you feed it. Run it at 12S (44.4V nominal), and you get approximately 16,872 RPM unloaded. Run it at 8S (29.6V), and you get about 11,248 RPM.<\/p>\r\n\r\n

That's the key insight most newcomers miss: KV alone doesn't determine speed<\/strong>. The battery voltage does the multiplying. A 380KV motor at 12S spins faster than a 600KV motor at 6S. The KV number only tells you the ratio \u2014 you supply the voltage that determines the actual RPM.<\/p>\r\n\r\n

Three things KV is not:<\/p>\r\n