Understanding KV in a Brushless Motor

[7jsm7]

good video

[John23gr]

You spent the first third saying....nothing! And then started talking about Nitro motors.

Really bad - learn your stuff, and learn how to pass it on.

Sorry, but you take your risk of criticism when you air on Youtube.

[PERIZ99]

Great info...

[skateboardtechdeck]

is 7200 kv high for a 1/16.

[nitroplanes]

@skateboardtechdeck It depends on what your going to be using the RC for, with the 7200 it will be really fast.

[kojakos86]

thanks alot i wanted to know what motor id put to my turnigy car60a been in the hobby for a few month and had never though of learning about Kv. took me 5 second to fall on your video and another 5 second to understand haha.

Thanks alot good vid

[nitroplanes]

@kojakos86 Glad to hear that the video helped.

[rogue277]

Crappiest explanation ever.

[iminlovewithdiana]

Wouldnt if you get a higher voltage battery for a lower kv it will become the same power as a higher kv and it won't be as hot?

[VirusOfCyrus]

REALLY WISH YOU COULD PUT SOME SIMPLE EXAMPLES UP FOR RC BUGGIES/TRUCKS/TRUGGIES FOR 1/10 & 1/8 SIZE MODELS, I KNOW MOST PEOPLE WANT TO KNOW WHATS BEST FOR THOSE SIZE CARS, ESPECIALLY WHEN THEY WANT TO UPGRADE THEIR STANDARD CARS.

PLZ HELP US OUT WITH THAT, THANKS.

[nishidn]

i got 1000kv brushless outrunner motor, how many amp ESC should i use?

[bryanandrew369]

teach us about props!!!! for nitro and electric

[ThatBlueRabbit]

Wait, He sais the higher kv the less torque...... I have a 3500 Kv motor for my aerobatic plane? And its a monster! Both motor and plane. My plane is huge!!. I thought less kv bigger plane???

[rpm303]

Volts x Motor kv =motor RPM with out load

4s battery 14.8v X motor kv 3500 = 51800 rpm, no load

3s battery 12.6v X motor kv 2100 =26460 rpm, no load

Now prop choice will determine amperage draw You want to use a prop that wont exceed the manufacturers motor maximum

current draw(Max amp draw)

Always test your set up with a in line amp meter.

knowing your system amp draw will also help to ensure that you have the correct

esc and the correct C rating on your batteries for the best performance

[Shadigun88]

if i want to make my drift star's tire to move faster, do i need to get a high kv for speed or low kv for torpue, and what number of teeth of pinion gear do u request?

[noobslayer009]

These beginners guides are just fantastic keep em coming!!

[Paganiproductions]

so if you have a 1000 kv motor it will make 1000 rpm per volt

[Mostlyfun]

Thanks good info

[gluino]

I'm looking for an explanation of what an ESC actually does when I give 75% throttle stick or whatever. Does it give the equivalent of 75% the voltage of the lipo packs or what?

[420choky]

nice bench

[jackonejr]

I always thought KV = KiloVolts

[cuzncuzn]

@jackonejr

1,000 volts? Wouldn't that be a screamin' bird! :-)

[whatthehell440]

Good video tony where it educates some, unlike BH "Pete" every thing is perfect all the time Pullshit, all what BH "Pete" Cares about is stealling people money.

[tante0leen]

good job!

[alishanmao]

@PMRfly Just wanted to appreciate few of his good points.

[jauchiu]

Nice explanation. It is really hard to explain electronics.

[xToXiicxT3RRoRx]

So the higher the kv the more power it has?

[antsp1]

@xToXiicxT3RRoRx

No

[matticous10]

Helpful vid, thanks. One question though, what would anyone class as high KV and low KV?? Cheers.

[kGCryTeK]

could you get a low kv motor and give it a big prop for speed

[zip187]

@kGCryTeK make sure u have a good esc tho wih a high amp ratings as the larger the prop the more amps u pul :D

[itchyliabdo]

got my rc plane in the post from nitroplanes today,, YEAH!!!! ordered from usa to ireland. no prob, was just over a week waiting

thanks nitroplanes

[zip187]

@itchyliabdo what was postage like i live in uk?

[itchyliabdo]

@zip187,, shipping cost was 72$,, and the plane was 79$ xD

joys of living in ireland,, no good hobby shops,,loads if u like been robbed,,

hope this helped

[youronlycow]

What is torque? I know speed but torque? Someone reply please, thanks!

[sajtoscsoda]

@youronlycow torque roll is your motor's rolling effect. When you are hovering your RC plane it is going to slowly roll if you are not imputing any aileron... that is why helicopters are having tailrotors.

[sajtoscsoda]

@youronlycow simply torque is the acceleration...

[badgolf1]

excellent..we...i need stuff like this...ILL BUY MORE PARTS

[dishizo]

Great Vid, Love the work station you are at....am building one for myself right now :)

[raykiii]

Toni, good job. how about a beginner's corner on the nitro site to post all of these together for easy reference, and more as they grow.

[alishanmao]

Great video tony, it would be better if you talked about a bit more on matching the motor kv with ESC Amps and batteries mAh burst rates etc. thats what confuses people more

[blue2456]

@alishanmao heres the answer:

All motors, even at the same kv, different companies motors can draw different amounts of amps.

a 1/18th motor does not draw many amps. 25 amp is fine for almost every one.

1/10th on the other hand, anything under 3000kv you can use a 35 amp. 3000kv to about 4500kv is a 60 amp 4500 to 6000 is an 80 to 100 amp and above that requires 120+ amp esc.

For 1/8th 150 amps is good for most of the motors. 200 or more on 2000kv

Make sure you read your motor specs!!!!!

[blue2456]

to add: General kv chart

Micro size: 4000 low 160000 high

1/18th: 3000 low 7800 high

1/10th: 2000 low 6000 high

1/8th: 1050 low 2000 high

1/5th: 700 low 900 high

low is best for crawling and high power situations

medium is best for off road racing

high is best for on road racing

Also, lower kv draw less amps, requiring a less amp esc and longer runtimes with less heat.

[alishanmao]

@blue2456 the last sentence is much more helping to those people who are confused with what ESC to use with what KV motor. its true, for instance if we wanna fly an RC plane longer we go lower KV motor, lower Amp ESC that can handle a 4S for instance and get a real good long flight time suitable for FPV long range flights. we can also use higher Amp ESC to handle bigger batteries and we will have less heat, more flight time.

[LTF85199]

Finally a useful video

[XHELIBIGT]

Ya I know haha :) thxxxx!!!

[XHELIBIGT]

@gooniac33 yes that is very well possible :) but one again I wanted to keep it simple :) I gotta defend myself lol

[gooniac33]

@XHELIBIGT I did give you props! Just had to give you a hard time too!

[adampope64]

guys, this is just like a car, a Large low Cylinder motor (2.5 LT 4 cycl) is going to produce more torque the a 1.8LT 4cycl. yet the 1.8 might produce a lot more horsepower.

[gooniac33]

That was pretty simple and I think it cleared things up for most people! However I need to throw in another curve ball. You can get speed out of a low KV motor if you do it the right way. I took a Monster Power 32 motor and put it on the Parkzone T-28 and made it into a Reno Racer type of an airplane. It is only a 770kv motor which according to your explanation wouldn't work in this application. But it did. Because I used a high pitch prop. a 12X12 was my prop of choice. well over 100mph on 4s.

[XHELIBIGT]

Yes I will go into watts in another video. Remember I want to keep it simple guys. Also look at the title it says understanding kv. I want to keep each video to the point so I don't loose ppl

[optimistONE]

Simple and informative. Thank you.  Reposting this on my FB site.

[antsp1]

The problem is that you cannot choose a motor by KV alone. Watts is (for me) an easier to understand metric for choosing a motor for a given plane.

When I am picking out a motor I usually look at watts, KV, and size.

In that order.

[nishbrown]

Look at my horse. My horse is amazing.

[mailtopravit]

How many kv considered low, high, medium?

[MMX3SE]

@mailtopravit depends on motor size and applications.Micro motors can go up to 100000kv and industurial motor can go down to 10kv

[TheRCPlanes]

I don't like this video. My head was spinning in circles during some parts.

[metallicaboy360]

thanks :D 

[ronhawker]

Ok, maybe I can ask some leading questions I have had on electric motors and fitting them to planes. The first thing I came across when I was researching this was the watt rule of how many watts by weight of plane. Now that made sense because that was power. I cannot however relate to saying a "40" size plane. Having not flown nitro in over 30 that means very little in relation to a plane I need a motor for. Watts do. 16oz plane - 45-50 watts. Now relate that to KV and props.

[jrm769]

i lost him after the "KV" part :/

[RoelandDNL]

Thanks, that was helpless (no.. Quite informative).. What was that prop? Rotating both ways?

[MinfangDuan]

whats with the crap quality

[TheRcfighterpilot]

@MinfangDuan its brand new give it a second to clean up

[gruzergrub5000]

@MinfangDuan if they barely posted it and you see it in lousy quality, its because youtube is still processing the video.

[flyingchimp99]

@MinfangDuan vids that have been just uploaded have bad quality while youtube procceses them........you were one of the first to watch so youtube was still procesing it giving it 240 resolution