Motor help?

Old 12-22-2009, 04:18 PM
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Questions?? Motor help?

Hey guys.
I just got into electric for fun and use to nitro, but on to the point I was wondering whats the difference when you see a motor rated 4200kv, 5400kv, etc., etc.??
What exactly does this mean.
Were talking about 1/18 scale here now.
So If I could get some answers on my newbie question that would help greatly.
Thanks
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Old 12-22-2009, 04:25 PM
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Originally Posted by MTclassPro View Post
Hey guys.
I just got into electric for fun and use to nitro, but on to the point I was wondering whats the difference when you see a motor rated 4200kv, 5400kv, etc., etc.??
What exactly does this mean.
Were talking about 1/18 scale here now.
So If I could get some answers on my newbie question that would help greatly.
Thanks
pretty much means the speed at which the motor can spin with zero load. higher kv means more rev per volts
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Old 12-22-2009, 04:32 PM
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I felt like thats what It meant. Thanks buddy, it makes sense now.
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Old 12-22-2009, 04:35 PM
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Originally Posted by NochikenStrips View Post
pretty much means the speed at which the motor can spin with zero load. higher kv means more rev per volts
Correct. But to be more precise the kv ratings is the number of RPMS it spins multiplied by the amount of volts you put into it with no load as mentioned.

So a 5700kv motor on a 2S lipo (7.4v) will be 5,700 x 7.4 = 42,180 rpms spinning freely.

Can do that with any amount of cells and any sized lipo.

Keep in mind that its always more efficient and better to put a larger amount of volts into a lower kv motor. And rule of thumb is to never exceed 60,000 rpms.
So don't think its a good idea to get a 9000kv motor and a 3S lipo because it will blow something up.
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Old 12-22-2009, 04:37 PM
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Originally Posted by Neu_Racer View Post
Correct. But to be more precise the kv ratings is the number of RPMS it spins multiplied by the amount of volts you put into it with no load as mentioned.

So a 5700kv motor on a 2S lipo (7.4v) will be 5,700 x 7.4 = 42,180 rpms spinning freely.

Can do that with any amount of cells and any sized lipo.

Keep in mind that its always more efficient and better to put a larger amount of volts into a lower kv motor. And rule of thumb is to never exceed 60,000 rpms.
So don't think its a good idea to get a 9000kv motor and a 3S lipo because it will blow something up.
ahhh,I see. makes bunch of sense now.
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