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Old Sep 28, 2012, 05:40 AM
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United States, CA, Marina
Joined Feb 2009
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Originally Posted by Herb View Post
When it starts pulling a lot more amps than expected it's a sign that the magnets are done.

Also, usually the esc is the first to go right after the motor demagnetizes.

A very rough rule of thumbs is about 8 Watts per motor gram.

So for reliable operation at 3000W you need a 350g motor or so (although some motors are better than others ). Esp. in the summer ... Dont' expect a 180g $17 motor to last more than one flight at 3000W ...

There are many quality motors out there, Neu, Het, Leopard, HKY, some Turnigy SK3 edf inrunners, the JePe chinese edf inrunners, and a few more open endbells chinese inrunners like Tenshock, and a few others. Plus of course high end stuff like Plettenberg and Schuebeler.

To make a long story short, if you are aiming at 3000W or so, your motor should be > 300g at least.
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