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


what does that mean?????????????????????????????????????????????? ??

It is RPM/volt. So a 1100 kv motor turns (or tries to!) 11,000 rpm with 10volts.

Mike

volts X kv = rpms a motor should turn.

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.

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.

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.........

What prop were you using with the 1100 kv motor?

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

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.