Feb 25, 2012, 12:56 AM Registered User Joined Feb 2012 150 Posts Discussion Multicopter Motor Guide 101 Hello! I've been doing a lot of research on building a quad. Read a lot of the beginner threads here. I'm still confused regarding motor selection. I was hoping some of you could give a brief guide to selecting and comparing one of the most important decisions. What you should know before selecting your motors... What exactly is the KV rating? How do you match a prop for a particular motor? How does the weight of the motor come into consideration? What to look for regarding max RPM and Working current? Any recommendations on inexpensive motors. Thanks!
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 Feb 25, 2012, 01:18 AM Registered User Joined Jan 2012 77 Posts KV rating is the RPM per Volt so a 1000KV motor will rotate at 11,100 RPM at 11.1V will have to wait for answers from those with experience for the rest of the questions
 Feb 25, 2012, 04:22 AM Registered User Australia, NSW, Glen Innes Joined Sep 2011 112 Posts Here's a useful resource for comparing motor/ battery/ ESC /prop combinations : http://www.ecalc.ch/xcoptercalc_e.htm Happy flying P
 Feb 25, 2012, 10:50 AM Registered User Joined Feb 2012 150 Posts So, higher KV is not necessarily better for a quad? Is their a rule of thumb high or lower KV for acrobatic, or as a stable camera platform, how does the KV selection effect your prop choice? High KV with a smaller prop equals lower KV with a larger prop?
 Feb 25, 2012, 11:18 AM Registered User Joined Apr 2010 1,429 Posts "I've been doing a lot of research on building a quad. How do you match a prop for a particular motor?" What is the projected weight of your quad ? 200g, 1000g or more ?
Feb 25, 2012, 11:34 AM
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Quote:
 Originally Posted by disneytoy What you should know before selecting your motors... weight of EVERYTHING you plan to fly What exactly is the KV rating? rpm of motor at a given voltage How do you match a prop for a particular motor? by the amp draw with the prop selected How does the weight of the motor come into consideration? the lighter the less you have to carry? What to look for regarding max RPM and Working current? whatever you like as long as you know what you are doing Any recommendations on inexpensive motors. loads but this has been said so many time the thread is flooded with setup info Thanks!
no worries

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