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Re:Micro Scisky: A 32-bit Open-Source Brushed Flight Controller by frik on Monday November 20, 2017 @08:17AM (#15739658)
brushed = old tech = coal (which wears down and require replacement)

brushless = new tech, no maintainance

Brushes wear down and require replacement, brushless DC motors using power electronic devices have displaced brushed motors from many applications. https://en.wikipedia.org/wiki/Brushed_DC_electric_motor

Re:Micro Scisky: A 32-bit Open-Source Brushed Flight Controller by flexd on Monday November 20, 2017 @08:33AM (#15739747)
In my experience the brushed motors used for that size either break quickly with crashes, or just stop to work within 4-6 hours (max!) of flight time. The brushless motors are much more solid and less likely to fail. I have broken many of those too, but they last a lot longer.