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Old Dec 26, 2005, 05:40 PM
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what does kv stand for


i am going to buy a brushless motor and the one i bought is rated at 1100 kv


what does that mean?????????????????????????????????????????????? ??
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Old Dec 26, 2005, 05:44 PM
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It is RPM/volt. So a 1100 kv motor turns (or tries to!) 11,000 rpm with 10volts.

Mike
Old Dec 26, 2005, 07:38 PM
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volts X kv = rpms a motor should turn.
Old Dec 27, 2005, 09:55 AM
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Kv of 1100 is a fairly "cool" motor - it will be happiest swinging a rather large prop at fairly low rpm with a low current draw (relatively), and will likely be most suitabe for a plane that flies rather slowly. A "hot" motor might have a kv of 5000, and will want to spin much faster, so you'd put that with a small prop in a fast plane - or gear it down to spin a bigger prop more slowly.
Old Dec 27, 2005, 12:53 PM
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Higher KV motors also tend to be able to accept more amps, so sometimes a high KV motor in a GB is a better choice for slow flying planes that require a lot of power, such as 3D planes.
Old Dec 27, 2005, 01:10 PM
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Quote:
Originally Posted by Resurgam
Kv of 1100 is a fairly "cool" motor - it will be happiest swinging a rather large prop at fairly low rpm with a low current draw (relatively), and will likely be most suitabe for a plane that flies rather slowly. A "hot" motor might have a kv of 5000, and will want to spin much faster, so you'd put that with a small prop in a fast plane - or gear it down to spin a bigger prop more slowly.
I have a gws slow stick after i installed the motor it seamed like i had no power well you know what i mean is seemed like the stock motor put out more power than the brushless 1100 kv so i took the motor off and returned it for a 1750 kv motor i am swinging a 10 by 4.7 i can now leap off the ground at full throttle an hover i get around a 35 min flight i am very happy because i spent under 58 dollars ...............

kms KMB 31/21 brushless motor 1750 kv
castle creations THUNDERBIRD 18 esc
apc 10-4.7 prop direct drive
kms 31/21 stick motor mount

here are a few pics of before and after the brushless was installed
you can see the old setup and motor on page 2 0f electric plane talk called brushless motor good for ss.........
Old Dec 27, 2005, 06:02 PM
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What prop were you using with the 1100 kv motor?
Old Dec 27, 2005, 08:50 PM
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Quote:
Originally Posted by Resurgam
What prop were you using with the 1100 kv motor?
i was using the recommended prop 10-4.7 and 9-4.7
Old Dec 28, 2005, 07:41 AM
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Since the 1750 kv motor performs well with a 10x4.7, it sounds like the 1100 kv motor just needed a bigger prop, maybe 12x6 or something - or a higher voltage battery.


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