{"id":10880,"date":"2020-09-05T07:24:16","date_gmt":"2020-09-05T07:24:16","guid":{"rendered":"https:\/\/dronenodes.com\/?p=10880"},"modified":"2023-07-18T18:43:57","modified_gmt":"2023-07-18T18:43:57","slug":"quadcopter-motor-propeller-rotation","status":"publish","type":"post","link":"https:\/\/dronenodes.com\/quadcopter-motor-propeller-rotation\/","title":{"rendered":"Understanding Quadcopter Motor and Propeller Rotation"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">QUADCOPTER MOTOR DIRECTION<\/h2>\n\n\n\n<p>There are 2 directions of propeller rotation: \u201cProps-out\u201d and \u201cProps-in\u201d. Both have their pros and cons. The traditional direction is \u201cProps-in\u201d and it\u2019s the default for all modern firmware. It\u2019s also a standard for all multicopters.<\/p>\n\n\n<style>.kb-row-layout-id_5225c5-d8 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id_5225c5-d8 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id_5225c5-d8 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-sm, 1.5rem);grid-template-columns:repeat(2, minmax(0, 1fr));}.kb-row-layout-id_5225c5-d8 > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id_5225c5-d8 > .kt-row-column-wrap{grid-template-columns:repeat(2, minmax(0, 1fr));}}@media all and (max-width: 767px){.kb-row-layout-id_5225c5-d8 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id_5225c5-d8 alignnone wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column_c71856-84 > .kt-inside-inner-col,.kadence-column_c71856-84 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_c71856-84 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_c71856-84 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_c71856-84 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_c71856-84 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_c71856-84{position:relative;}@media all and (max-width: 1024px){.kadence-column_c71856-84 > .kt-inside-inner-col{flex-direction:column;}}@media all and (max-width: 767px){.kadence-column_c71856-84 > .kt-inside-inner-col{flex-direction:column;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column_c71856-84\"><div class=\"kt-inside-inner-col\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Props-in-configuration.png\"><img decoding=\"async\" loading=\"lazy\" width=\"481\" height=\"346\" src=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Props-in-configuration.png\" alt=\"Props-in configuration\" class=\"wp-image-11036\" srcset=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Props-in-configuration.png 481w, https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Props-in-configuration-300x216.png 300w\" sizes=\"(max-width: 481px) 100vw, 481px\" \/><\/a><figcaption class=\"wp-element-caption\">Props-in configuration<\/figcaption><\/figure><\/div><\/div><\/div>\n\n\n<style>.kadence-column_b286d7-d8 > .kt-inside-inner-col,.kadence-column_b286d7-d8 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_b286d7-d8 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_b286d7-d8 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_b286d7-d8 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_b286d7-d8 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_b286d7-d8{position:relative;}@media all and (max-width: 1024px){.kadence-column_b286d7-d8 > .kt-inside-inner-col{flex-direction:column;}}@media all and (max-width: 767px){.kadence-column_b286d7-d8 > .kt-inside-inner-col{flex-direction:column;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column_b286d7-d8\"><div class=\"kt-inside-inner-col\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Props-out-configuration.png\"><img decoding=\"async\" loading=\"lazy\" width=\"478\" height=\"347\" src=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Props-out-configuration.png\" alt=\"Props-out configuration\" class=\"wp-image-11037\" srcset=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Props-out-configuration.png 478w, https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Props-out-configuration-300x218.png 300w\" sizes=\"(max-width: 478px) 100vw, 478px\" \/><\/a><figcaption class=\"wp-element-caption\">Props-out configuration<\/figcaption><\/figure><\/div><\/div><\/div>\n\n<\/div><\/div>\n\n\n<p>\u201cProps-out\u201d configuration with most pros for 3\u201d quadcopters and smaller, at least when you\u2019re focusing on notable flight characteristics. This becomes quite obvious when you\u2019re making a sharp turn;<\/p>\n\n\n\n<p>\u201cProps-in\u201d rotation configuration, sharp turn causes a sudden dip and lift just like in a dull 90\u00b0 turn due to the turbulence during the yaw rotation. Some earlier whoop crafts all had this issue, until a solution was found: a reverse (\u201cProps-out\u201d) rotation.<\/p>\n\n\n\n<p>Except for the aerodynamic benefits in (3\u201c to sub-3\u201c) smaller crafts, it\u2019s a good idea to set the \u201cProps-out\u201d direction for the FPV camera. There\u2019s a smaller chance of damage and getting dirty during the crash. That is because the propellers rotate away from the camera so the dust, mud, grass, leaves, etc. are being discarded away from it, in the direction of a craft rim.<\/p>\n\n\n\n<p>\u201cProps-out\u201d configuration is also great for indoor flying- in case you hit the wall, the craft will bounce back due to the propeller rotation direction. If you decide to fly in the woods, leaves and branches won\u2019t be sucked in and that won\u2019t cause you to crash.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/quadcopter-motor-directions.jpg\"><img decoding=\"async\" loading=\"lazy\" width=\"847\" height=\"563\" src=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/quadcopter-motor-directions.jpg\" alt=\"quadcopter motor directions\" class=\"wp-image-11052\" srcset=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/quadcopter-motor-directions.jpg 847w, https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/quadcopter-motor-directions-300x199.jpg 300w, https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/quadcopter-motor-directions-768x510.jpg 768w\" sizes=\"(max-width: 847px) 100vw, 847px\" \/><\/a><\/figure><\/div>\n\n\n<p>\u201cProps-in\u201d would do exactly that &#8211; draw all branches and leaves in the radius of the propeller. That means it won\u2019t be very easy to get out of the sticky situation &#8211; if even possible. While racing, catching a turn flag or a gate top bar with your drone is less likely to happen. It will just bounce off and keep flying without any trouble.<\/p>\n\n\n\n<p>\u201cProps-out\u201d configuration, in theory, can be a bit more efficient when compared to traditional \u201cProps-in\u201d one. Propellers rotating in opposite direction change the position of thrust centre inwards (to the centre of the craft). That\u2019s why the turbulence is not as strong on the back of the quadcopter.<\/p>\n\n\n\n<p>Considering the quadcopter, when flying in a straight line, always has the front a bit lower when compared to the back of the craft, front propellers don\u2019t create turbulence for the back propellers- because they\u2019re placed lower than the back ones. When hovering, both configurations are identical and you won\u2019t know the difference.<\/p>\n\n\n<style>.kb-row-layout-id_485ec8-9f > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id_485ec8-9f > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id_485ec8-9f > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-sm, 1.5rem);grid-template-columns:repeat(2, minmax(0, 1fr));}.kb-row-layout-id_485ec8-9f > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id_485ec8-9f > .kt-row-column-wrap{grid-template-columns:repeat(2, minmax(0, 1fr));}}@media all and (max-width: 767px){.kb-row-layout-id_485ec8-9f > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id_485ec8-9f alignnone wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column_690ce9-69 > .kt-inside-inner-col{display:flex;}.kadence-column_690ce9-69 > .kt-inside-inner-col,.kadence-column_690ce9-69 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_690ce9-69 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_690ce9-69 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column_690ce9-69 > .kt-inside-inner-col > .aligncenter{width:100%;}.kt-row-column-wrap > .kadence-column_690ce9-69{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column_690ce9-69{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column_690ce9-69 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column_690ce9-69 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_690ce9-69{position:relative;}@media all and (max-width: 1024px){.kadence-column_690ce9-69 > .kt-inside-inner-col{flex-direction:column;}}@media all and (max-width: 767px){.kadence-column_690ce9-69 > .kt-inside-inner-col{flex-direction:column;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column_690ce9-69\"><div class=\"kt-inside-inner-col\">\n<p>Cons of \u201cProps-out\u201d configuration are quite obvious when dealing with bigger crafts (over 4\u201d)- high amount of dust and particles in the air will access the middle of the craft\u2019s sides, especially if you have \u201ctrue X\u201d frame on your hands. This can damage the USB port and other connectors placed in the middle part of the frame. A good solution for this is USB (and other connectors) plugs that protect ports from the dust.<\/p>\n<\/div><\/div>\n\n\n<style>.kadence-column_fefcdd-4e > .kt-inside-inner-col,.kadence-column_fefcdd-4e > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_fefcdd-4e > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_fefcdd-4e > .kt-inside-inner-col{flex-direction:column;}.kadence-column_fefcdd-4e > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_fefcdd-4e > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_fefcdd-4e{position:relative;}@media all and (max-width: 1024px){.kadence-column_fefcdd-4e > .kt-inside-inner-col{flex-direction:column;}}@media all and (max-width: 767px){.kadence-column_fefcdd-4e > .kt-inside-inner-col{flex-direction:column;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column_fefcdd-4e\"><div class=\"kt-inside-inner-col\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/props-out-dirt.jpg\"><img decoding=\"async\" loading=\"lazy\" width=\"438\" height=\"463\" src=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/props-out-dirt.jpg\" alt=\"props out dirt\" class=\"wp-image-11042\" srcset=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/props-out-dirt.jpg 438w, https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/props-out-dirt-284x300.jpg 284w\" sizes=\"(max-width: 438px) 100vw, 438px\" \/><\/a><\/figure><\/div><\/div><\/div>\n\n<\/div><\/div>\n\n\n<p>You shouldn\u2019t forget about the Flip-over-after-crash feature. In that case -unlike the \u201cProps-in\u201d config, propellers will rotate in the camera\u2019s direction (at this point the craft is upside-down). Considering the propellers are directly on the ground- dust, dirt, mud, etc will cover the camera lens which can make the flight difficult after you get back into the correct position. In \u201cProps-in\u201d config, that\u2019s not the case. All the mud will be moving away from the frame centre.<\/p>\n\n\n\n<p>To set \u201cProps-out\u201d configuration, you need to reverse the direction of rotation of each motor. You can do that in BLHeli Suite program, in \u201cMotor Direction\u201d function. You\u2019ll set two \u201creversed\u201d motors to \u201cnormal\u201d, and \u201cnormal\u201d to \u201creversed\u201d.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Betaflight-Configurator.png\"><img decoding=\"async\" loading=\"lazy\" width=\"774\" height=\"508\" src=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Betaflight-Configurator.png\" alt=\"Betaflight Configurator\" class=\"wp-image-11046\" srcset=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Betaflight-Configurator.png 774w, https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Betaflight-Configurator-300x197.png 300w, https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Betaflight-Configurator-768x504.png 768w\" sizes=\"(max-width: 774px) 100vw, 774px\" \/><\/a><\/figure><\/div>\n\n<style>.kb-row-layout-id_edef0d-48 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id_edef0d-48 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id_edef0d-48 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-sm, 1.5rem);grid-template-columns:repeat(2, minmax(0, 1fr));}.kb-row-layout-id_edef0d-48 > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id_edef0d-48 > .kt-row-column-wrap{grid-template-columns:repeat(2, minmax(0, 1fr));}}@media all and (max-width: 767px){.kb-row-layout-id_edef0d-48 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id_edef0d-48 alignnone wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column_1f8a73-c6 > .kt-inside-inner-col{display:flex;}.kadence-column_1f8a73-c6 > .kt-inside-inner-col,.kadence-column_1f8a73-c6 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_1f8a73-c6 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_1f8a73-c6 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column_1f8a73-c6 > .kt-inside-inner-col > .aligncenter{width:100%;}.kt-row-column-wrap > .kadence-column_1f8a73-c6{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column_1f8a73-c6{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column_1f8a73-c6 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column_1f8a73-c6 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_1f8a73-c6{position:relative;}@media all and (max-width: 1024px){.kadence-column_1f8a73-c6 > .kt-inside-inner-col{flex-direction:column;}}@media all and (max-width: 767px){.kadence-column_1f8a73-c6 > .kt-inside-inner-col{flex-direction:column;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column_1f8a73-c6\"><div class=\"kt-inside-inner-col\">\n<p>Next, you\u2019ll set all motors to \u201creversed\u201d in Betaflight Configurator. By clicking \u201cSave and reboot\u201d, you save the configuration and activate \u201cProps-out\u201d config.<\/p>\n<\/div><\/div>\n\n\n<style>.kadence-column_ad9c3b-9b > .kt-inside-inner-col,.kadence-column_ad9c3b-9b > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_ad9c3b-9b > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_ad9c3b-9b > .kt-inside-inner-col{flex-direction:column;}.kadence-column_ad9c3b-9b > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_ad9c3b-9b > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_ad9c3b-9b{position:relative;}@media all and (max-width: 1024px){.kadence-column_ad9c3b-9b > .kt-inside-inner-col{flex-direction:column;}}@media all and (max-width: 767px){.kadence-column_ad9c3b-9b > .kt-inside-inner-col{flex-direction:column;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column_ad9c3b-9b\"><div class=\"kt-inside-inner-col\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/motor-direction-reversed-betaflight.png\"><img decoding=\"async\" loading=\"lazy\" width=\"257\" height=\"72\" src=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/motor-direction-reversed-betaflight.png\" alt=\"motor direction reversed betaflight\" class=\"wp-image-11047\"\/><\/a><\/figure><\/div><\/div><\/div>\n\n<\/div><\/div>\n\n\n<p>The only thing what\u2019s left to do is to switch the propellers- you set CCW propellers to CW position and CW to CCW position.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">HOW TO PAIR MOTORS TO PROPS FOR SPEED OR EFFICIENCY?<\/h2>\n\n\n\n<p>In short: by the frame size.<\/p>\n\n\n\n<p>You should always pick the propellers (their diameter) by the frame size-the biggest diameter allowed regarding the frame. The larger surface they cover (without touching the opposite motor propellers), the more efficient they are. That\u2019s because the area not covered by propellers is smaller- efficiency refers to the propeller area (A = \u03c0r2). Even the smallest diameter increase can make a big difference and make the quad more efficient. Next step is choosing motors in regards to propellers.<\/p>\n\n\n\n<p>Choosing the correct motor\/propeller combo isn\u2019t as easy as it seems. What makes it even harder is the fact most manufacturers don\u2019t offer information about all propeller types you can mount totheir motor. That means even more unknown variables in this \u201cmath\u201d of perfect motor\/prop combination. What can help you here is relying on tested motor\/prop combinations (identical or similar ones) or prop\/thrust ratings.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">PROPELLERS<\/h2>\n\n\n\n<p>Generally speaking of propellers: craft agility is conditioned by how fast it can change the thrust- how fast you can change the RPM (number of rotations) of propellers.<\/p>\n\n\n\n<p>It&#8217;s easier to change the acceleration for smaller propellers; bigger ones need more time for that. Too much time accelerating\/decelerating and you won\u2019t be able to fly. That\u2019s why you can see smaller propellers on hexacopters and octocopters in comparison to giant quadcopter propellers.<\/p>\n\n\n\n<p>The propeller pitch is also important here. We measure it in inches and it represents the distance in vertical axis it takes for a propeller to make a full circle while rotating (in ideal conditions). When marking the propeller, for example, number \u201c5145 \u201c: 51 means 5.1\u201d diameter and 4.5\u201d pitch. If you want to fly faster, propeller\u2019s pitch must be more aggressive. If you\u2019re planning to stick to hovering speed (for filming, slow circling\u2026) you\u2019ll want the smallest possible pitch of the propeller.<\/p>\n\n\n\n<p>To conclude: the speed (better say, craft\u2019s purpose) is directly tied to the propeller\u2019s pitch.\u00a0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">MOTORS<\/h2>\n\n\n\n<p>In practice, you pick the motor according to the propeller type. If you mount motor too big, it will be too heavy, and too small one won\u2019t be efficient enough and it will most probably burn.<\/p>\n\n\n\n<p>Smaller propellers require a higher RPM motor; they need to rotate faster to create strong enough thrust to be able to fly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SUMMARY<\/h2>\n\n\n\n<p>All things considered, an efficient craft has optimal motor size with low RPM and large propellers. Acro quad will need smaller, more aggressive propellers, faster motors, and a bit higher voltage for a faster throttle response.<\/p>\n\n\n\n<p>The chances of finding all torque curve combinations in RC motors are quite slim. It\u2019s easier to find out the thrust\/prop rating in combination with different prop sizes, which is very helpful when calculating how fast you\u2019ll be able to lift the craft and how long you\u2019ll fly it.<\/p>\n\n\n\n<p>As a rule of thumb, the thrust\/weight ratio should be 2:1 for a standard quadcopter, and 5:1 for acro\/race quadcopter. Only for hovering (edge of availability) is a minimum 1.8:1.<\/p>\n\n\n\n<p>Here&#8217;s an example: we have a craft with 1kg AUW (All Up Weight), the total thrust produced by motors at the full-throttle should be 2 kg (500g of thrust per motor minimum- If talking about a quad).<\/p>\n\n\n\n<p>Pure racers have weight\/thrust ratio over 5:1- it can even reach 8:1 (sometimes even brutal 10:1). Those ratios are useful for sharp turns, insane acceleration, and sharp cornering. We must emphasize the crafts with those rations are terribly difficult to control and you need a lot of practice to be capable of that. If you\u2019re looking for a slow flyer and aerialrecording craft, you\u2019ll want a thrust\/weight ratioof about 3:1 or 4:1. This build allows a super-precise control and leaves enough room for payload (camera, etc) or heavier batteries if you want to extend the flight time.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">CONCLUSION<\/h2>\n\n\n\n<p>In conclusion, to correctly determinate motor efficiency, the starting point is always the frame.<\/p>\n\n\n\n<p><br><strong>Frame size -&gt; Propeller size -&gt; Motor Size (and Kv)<\/strong><\/p>\n\n\n\n<p>Even though a lot of people will do differently, according to their needs, propeller proportion, motor, and motor\u2019s Kv, this handy chart can be a great reference to what combo is best to have depending on the frame size.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>FRAME SIZE<\/strong><\/th><th><strong>PROP SIZE<\/strong><\/th><th><strong>MOTOR SIZE<\/strong><\/th><th><strong>MOTOR KV<\/strong><\/th><\/tr><\/thead><tbody><tr><td>150mm or less<\/td><td>3\u201c or smaller<\/td><td>1306 or smaller<\/td><td>3000Kv or higher<\/td><\/tr><tr><td>180mm<\/td><td>4&#8243;<\/td><td>1806<\/td><td>2600Kv<\/td><\/tr><tr><td>210mm<\/td><td>5&#8243;<\/td><td>2204-2206<\/td><td>2300Kv-2600Kv<\/td><\/tr><tr><td>250mm<\/td><td>6&#8243;<\/td><td>2204-2208<\/td><td>2000Kv-2300Kv<\/td><\/tr><tr><td>350mm<\/td><td>7&#8243;<\/td><td>2208<\/td><td>1600Kv<\/td><\/tr><tr><td>450mm<\/td><td>8&#8243;, 9&#8243;, 10&#8243;,<\/td><td>2212 or bigger<\/td><td>1000Kv or\u00a0lower<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>If you want to be fully precise when calculating efficiency, you can use old but good&nbsp;<a href=\"https:\/\/www.ecalc.ch\/xcoptercalc.php\" target=\"_blank\" rel=\"noreferrer noopener\">online eCalc calculator<\/a>. Not only you\u2019ll be very precise in your calculation, but also you\u2019ll be able to calculate all the details tied to dynamics, flight time, motor load, etc.<\/p>\n\n\n\n<p>You\u2019ll have to pay the membership (only a few dollars) and it expires in a month. You get a lot for this price- you can use all parameters offered. You can even save dozens of dollars by checking if the combination you were planning to get has some shortcomings you didn\u2019t see coming- if the flight time and motor loads are not mathematically correct.\u00a0<\/p>\n\n\n<style>.kt-info-box_18feff-cb .kt-blocks-info-box-link-wrap{border-top:5px solid var(--global-palette7, #eeeeee);border-right:5px solid var(--global-palette7, #eeeeee);border-bottom:5px solid var(--global-palette7, #eeeeee);border-left:5px solid var(--global-palette7, #eeeeee);border-top-left-radius:30px;border-top-right-radius:30px;border-bottom-right-radius:30px;border-bottom-left-radius:30px;background:#ffffff;padding-top:var(--global-kb-spacing-xs, 1rem);padding-right:var(--global-kb-spacing-xs, 1rem);padding-bottom:var(--global-kb-spacing-xs, 1rem);padding-left:var(--global-kb-spacing-xs, 1rem);}.kt-info-box_18feff-cb .kadence-info-box-image-inner-intrisic-container{max-width:100px;}.kt-info-box_18feff-cb .kadence-info-box-image-inner-intrisic-container .kadence-info-box-image-intrisic{padding-bottom:100%;width:200px;height:0px;max-width:100%;}.kt-info-box_18feff-cb .kadence-info-box-icon-container .kt-info-svg-icon, .kt-info-box_18feff-cb .kt-info-svg-icon-flip, .kt-info-box_18feff-cb .kt-blocks-info-box-number{font-size:50px;}.kt-info-box_18feff-cb .kt-blocks-info-box-media{border-radius:200px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;padding-top:20px;padding-right:20px;padding-bottom:20px;padding-left:20px;margin-top:0px;margin-right:20px;margin-bottom:0px;margin-left:0px;}.kt-info-box_18feff-cb .kt-blocks-info-box-media .kadence-info-box-image-intrisic img{border-radius:200px;}.kt-info-box_18feff-cb .kt-infobox-textcontent h3.kt-blocks-info-box-title{padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;margin-top:5px;margin-right:0px;margin-bottom:10px;margin-left:0px;}.kt-info-box_18feff-cb .kt-blocks-info-box-learnmore{background:transparent;border-width:0px 0px 0px 0px;padding-top:4px;padding-right:8px;padding-bottom:4px;padding-left:8px;margin:10px 0px 10px 0px;}@media all and (max-width: 1024px){.kt-info-box_18feff-cb .kt-blocks-info-box-link-wrap{border-top:5px solid var(--global-palette7, #eeeeee);border-right:5px solid var(--global-palette7, #eeeeee);border-bottom:5px solid var(--global-palette7, #eeeeee);border-left:5px solid var(--global-palette7, #eeeeee);}}@media all and (max-width: 767px){.kt-info-box_18feff-cb .kt-blocks-info-box-link-wrap{border-top:5px solid var(--global-palette7, #eeeeee);border-right:5px solid var(--global-palette7, #eeeeee);border-bottom:5px solid var(--global-palette7, #eeeeee);border-left:5px solid var(--global-palette7, #eeeeee);}}<\/style>\n<div class=\"wp-block-kadence-infobox kt-info-box_18feff-cb\"><span class=\"kt-blocks-info-box-link-wrap info-box-link kt-blocks-info-box-media-align-left kt-info-halign-left\"><div class=\"kt-blocks-info-box-media-container\"><div class=\"kt-blocks-info-box-media kt-info-media-animate-none\"><div class=\"kadence-info-box-image-inner-intrisic-container\"><div class=\"kadence-info-box-image-intrisic kt-info-animate-none\"><div class=\"kadence-info-box-image-inner-intrisic\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/04\/davor-kustec-drone-nodes-author.jpg\" alt=\"davor-kustec-drone-nodes-author\" width=\"200\" height=\"200\" class=\"kt-info-box-image wp-image-9591\" srcset=\"https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/04\/davor-kustec-drone-nodes-author.jpg 200w, https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/04\/davor-kustec-drone-nodes-author-150x150.jpg 150w, https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/04\/davor-kustec-drone-nodes-author-65x65.jpg 65w, https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/04\/davor-kustec-drone-nodes-author-100x100.jpg 100w\" sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/div><\/div><\/div><\/div><\/div><div class=\"kt-infobox-textcontent\"><h3 class=\"kt-blocks-info-box-title\"><strong>\u00a0Author:\u00a0<\/strong>Davor Kustec<\/h3><\/div><\/span><\/div>\n","protected":false},"excerpt":{"rendered":"<p>QUADCOPTER MOTOR DIRECTION There are 2 directions of propeller rotation: \u201cProps-out\u201d and \u201cProps-in\u201d. Both have their pros and cons. The&#8230;<\/p>\n","protected":false},"author":6,"featured_media":10981,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[136],"tags":[73],"taxonomy_info":{"category":[{"value":136,"label":"Brushless Motors"}],"post_tag":[{"value":73,"label":"brushless motor"}]},"featured_image_src_large":["https:\/\/dronenodes.com\/wp-content\/uploads\/2020\/09\/Motor-Propeller-Rotation-1024x683.jpg",1024,683,true],"author_info":{"display_name":"DN","author_link":"https:\/\/dronenodes.com\/author\/dronenodes\/"},"comment_info":1,"category_info":[{"term_id":136,"name":"Brushless Motors","slug":"brushless-motors","term_group":0,"term_taxonomy_id":136,"taxonomy":"category","description":"","parent":0,"count":4,"filter":"raw","cat_ID":136,"category_count":4,"category_description":"","cat_name":"Brushless Motors","category_nicename":"brushless-motors","category_parent":0}],"tag_info":[{"term_id":73,"name":"brushless motor","slug":"brushless-motor","term_group":0,"term_taxonomy_id":73,"taxonomy":"post_tag","description":"","parent":0,"count":4,"filter":"raw"}],"_links":{"self":[{"href":"https:\/\/dronenodes.com\/wp-json\/wp\/v2\/posts\/10880"}],"collection":[{"href":"https:\/\/dronenodes.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dronenodes.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dronenodes.com\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/dronenodes.com\/wp-json\/wp\/v2\/comments?post=10880"}],"version-history":[{"count":0,"href":"https:\/\/dronenodes.com\/wp-json\/wp\/v2\/posts\/10880\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dronenodes.com\/wp-json\/wp\/v2\/media\/10981"}],"wp:attachment":[{"href":"https:\/\/dronenodes.com\/wp-json\/wp\/v2\/media?parent=10880"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dronenodes.com\/wp-json\/wp\/v2\/categories?post=10880"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dronenodes.com\/wp-json\/wp\/v2\/tags?post=10880"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}