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07.31.2009, 05:45 PM
A fan till help the most, but keep in mind they do go bad from the dirt and dust. And 5v DC fans aren't exactly cheap either. If it were me I'd use a fan. I run a small 25mm fan on my MM running 4s in a crt.5 (Neu 1509 motor). I had to use one even with an external BEC. A MM esc just seems to struggle with heat on 4s without major mods.
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