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Old Nov 05, 2012, 12:14 AM
Skylar is offline
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我爱飞行 . . . I love flying
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South Africa, GP, Pretoria
Joined Jul 2003
424 Posts
Originally Posted by crashawk View Post
most people around here can't use formulas, it's easier to remember what the max watts recomended by the manufacturer is, and most have a max wattage, not max amps since if they rated it at x amps for say, 2 cells someone would try to run it at the same amps on 4 cells and very quickly burn it up. it's all in the watts. lol.

either way you look at it though, I still recomend a meter if you are going to experiment. a good way to measure the temp of the stator is a good idea too if you are really going to push it.

Hi Jason

I'm sure it works for you if you are guided by Watts. That is a safe method and there's nothing wrong with that. But... there are some of us who like to push our motors and how do we know what the limit for a motor is? We go by the amps, since amps determines the heat generated in a motor - not Watts! As stated before, the other determining factor is Rm (motor resistance). Finding (or winding) a motor with low Rm is of utmost importance. That is what drives the guys on this forum:

These days I often run my motors at double the specified "max Wattage" by using more cells, but staying within the amps limit. Obviously, it often means using a different motor with lower Kv, depending on the cell-count and prop size I want to use.

When I started learning about electric motors, I was also stuck in the "Watts-way of thinking". But fortunately some motor manufacturers stated max amps (not max Watts). That got me thinking and then I finally started understanding how a motor really works. So give it time -You'll come around (hopefully).

Have fun
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