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Blade mCPX › Brushed motor break in.
05-14-2011 05:34 AM  7 years agoPost 21
Gardner

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Orlando FL, United States

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Problem is that black stuff in the water is your brush material. You may get a marginal boost in performance but your brushes have been reduced in length by 50% or more. Life will be a good bit shorter. There is no free lunch with these very basic motors.

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05-14-2011 08:52 AM  7 years agoPost 22
michael88997

rrElite Veteran

Lewisville,Tx

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But all of this is coming off from normal running so it makes since to me that this carbon would still be worn off but instead of lodging inside the motor it's in the water washed out. Even if it does shorten the life I would rather have more power lol

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05-15-2011 02:13 AM  7 years agoPost 23
GyroFreak

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Orlando Florida ...28N 81W

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So how does this water break in give more power ?

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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05-15-2011 03:39 PM  7 years agoPost 24
michael88997

rrElite Veteran

Lewisville,Tx

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All that carbon that is in the water instead stays in your motor causing friction and power loss, everything I read says it gives more power and longer life... Guess we will find out

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05-16-2011 07:49 PM  7 years agoPost 25
Vader1

rrApprentice

Jackson, NJ

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It's like wet sanding something. Water breaks in the brushes while keeping them cool and removing the waste. Like new brake pads on a car with freshly cut rotors. If you don't break them in slow you can produce lots of heat and ruin your fresh brake job. The 2 surfaces don't match each other yet so they produce lots of unwanted heat. If you break in your brushes under water at a lower voltage it should do a nice job breaking in the brushes. I'm doing my motor at 3 volts. An electric motor that has been broken in under water hardly produces and spark when it is running.

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05-17-2011 12:23 AM  7 years agoPost 26
Gregor99

rrElite Veteran

Western Wa

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I tested this method many years ago and can confirm what Gardner is saying. Brushes and com were nice and smooth but ALOT of the brush material had been removed by the process. Not a big deal, because those old motors had replacable brushes, coms that could be reached by pen oiler for com drops and both bushings were accessible for oiling. On the mCPX, you cannot replace the brushes, you cannot lube the com (without dissassebly) and you cannot lube the upper bushing (again without disassemble). The cap is sealed and even though it looks like there's a spot to add lube, its not getting into the bushing.

I have two motors that I've flown to the point of malfuction. One one of them, I've disassembled the motor, cleaned it out polished the com and the brushes, added some lube (properly) and it will be put back in service when my existing motor dies.

To do the water breakin properly, you would disassemble the motor after breakin, add some com drops and properly lube both bearings.

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04-22-2012 02:43 AM  6 years agoPost 27
Rocka

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Mountain View, CA

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Thanks for the discussion below. I am relatively new to model helicopters, but have burned through four stock motors on the MCPX so far. The symptoms are power loss, erratic servo behavior, and reduced flight time.

Anyway, after reading the thread I tried flushing one of the bad motors w/ WD40 through the mounting hole until carbon slew stopped coming out of the various gaps and openings. After doing that, I have noticed that the current draw at 4.2V and no load went down by a factor of two (2), from roughly .8A to .4A. I have applied the same procedure to the other two bad motors that I have w/ similar results. So far, the typical "bad motor" symptoms appear to be gone. The motor seems to run less noisy during flight compared to before.

Thanks.

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04-22-2012 10:46 AM  6 years agoPost 28
airmanRD

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saugus california U.S.A

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even though the motors are broken in the life on mine were never long due to all the stress and current... i dont think that breaking in such a small motor is going to really make a difference due to the brush size and life of the motor.....that is why you go brushless!

-Ryan

What does not kill you ****s you up mentally

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