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Old Oct 10, 2012, 03:01 PM
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3flyguy3's Avatar
United States, IL
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Question
What do the numbers mean?

Say 2204 1480kv or 2203 1750kv. What is the first number? The second?
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Old Oct 10, 2012, 03:03 PM
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Ken Myers's Avatar
Commerce Township, MI
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This part of the article Electric Power Basics should help with this:

http://www.theampeer.org/e-basics/e-basics.htm#MOTORS

The whole article starts here:

http://www.theampeer.org/e-basics/e-basics.htm
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Old Oct 10, 2012, 07:21 PM
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Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
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Quote:
Originally Posted by 3flyguy3 View Post
Say 2204 1480kv or 2203 1750kv. What is the first number? The second?
The first motor has a stator of 22mm diameter, 4mm stator depth and a Kv (RPM per Volt) of 1480Kv... maybe weighs ~23g.

The second motor is slightly smaller (maybe ~18g): 22mm stator diameter, but only 3mm stator depth... 1750Kv, so, at the same voltage, it will have to spin a smaller prop than the lower Kv 1480Kv motor.
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Old Oct 10, 2012, 08:20 PM
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United States, IL
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Quote:
Originally Posted by Dr Kiwi View Post
The first motor has a stator of 22mm diameter, 4mm stator depth and a Kv (RPM per Volt) of 1480Kv... maybe weighs ~23g.

The second motor is slightly smaller (maybe ~18g): 22mm stator diameter, but only 3mm stator depth... 1750Kv, so, at the same voltage, it will have to spin a smaller prop than the lower Kv 1480Kv motor.
Why does it have to spin a smaller prop?
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Old Oct 11, 2012, 03:18 AM
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Letchworth, Great Britain (UK)
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The prop size, and how fast you try to spin it, determines the power output: The motor's kv number tells you how many rpm it'll try tp spin at for every volt you put in, so for the same voltage the higher kv number will spin the prop faster and, thus, consume and produce more power. If the motors are rated for the same maximum power, a prop that's right for the lower kv motor might overload the higher kv motor and cause it to burn out.
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Old Oct 11, 2012, 07:53 AM
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Thanks. Makes sense.
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