Oct 10, 2012, 03:01 PM Registered User United States, IL Joined Apr 2012 1,385 Posts Question What do the numbers mean? Say 2204 1480kv or 2203 1750kv. What is the first number? The second?
 Oct 10, 2012, 03:03 PM Registered User Commerce Township, MI Joined Aug 2001 4,363 Posts 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
Oct 10, 2012, 07:21 PM
Registered User
Chattanooga, Tennessee, United States
Joined May 2003
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Quote:
 Originally Posted by 3flyguy3 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.
Oct 10, 2012, 08:20 PM
Registered User
United States, IL
Joined Apr 2012
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Quote:
 Originally Posted by Dr Kiwi 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?
 Oct 11, 2012, 03:18 AM Registered User Letchworth, Great Britain (UK) Joined Jul 2004 11,437 Posts 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.
 Oct 11, 2012, 07:53 AM Registered User United States, IL Joined Apr 2012 1,385 Posts Thanks. Makes sense.