If I spend 140+ on an rc motor it sure as hell won't be brushed.

You got that right!!!

I may have to get a dewalt 820 and run it on 5s lipo with a MMM. See how good it really is...

Anyone know how effecient they are?

You mean aside from the arcing and friction from the brushes? :wink:

I think it has a built in fan... BrianG cryptonite there:lol:

You may be right, but it would be interesting to play with the "best" brushed has to offer, at least for 40 bucks...

BTW, I have the 6x6 maxx rolling now. Check the build thred!

TBH, I'd use a fan if it was built into the motor, kind of like a Pletty. It's the add-on crap I'm dead-set against. Not only does it look retarded and messy, it shouldn't be needed. But if the fan was built-in, I'd see it as a little extra insurance against heat. And I hate heat more than I hate fans.

Yeah, the plett fan is a really nice design. Makes the 1512 motor as capable as a 1515... I would rather not have the fan myself, but it does help alot on brushed motors.

As per that robotwars wiki, about 81% for the old style can

http://www.robowars.org/wikka/DewaltDrivetrain

Thanks, I may have to give it a try then, that rating is not much worse than a feigao!!!

Keep in mind though that efficiency will fall faster if they are run at lower voltage.

What voltage do they run the motors at? 24v?

I believe that it's the official specs they have on that website, which mean 18v. It should run best at 5-6s.

Reading back i noted that i was wrong. I originally though that you wanted to run it on 4s. That said if i was you i would use the mamba max on 4s and run 14.4v dewalt instead of the 18v. They are 820 sized too i believe(only .2oz of difference so they should be).

They are cheaper to start with too.
http://www.robotcombat.com/products/BP396505-21.html

Of course ohm law is ohm law and they should be a bit less efficient but it shouldn't more than 1 or 2% of difference.

some sparks do fly, but these motors handle 24 volts well.
@lincpimp get one. If you want brushed, get the dewalt.

I may still give the dewalt a try, but I think an outrunner will end up in the truck I am building. I have a 2826/12 axi that fits my gearing perfectly...

Ok, so I got a dewalt motor out of an 18v drill. How do I go about removing the pinion? Looks like it is pressed on, but the gear appears to be on as far as the front bearing. I guess I can grind the gear off on each side to release it...

Yeah, just grind off some teeth until the gear falls apart more or less, or grab a pinion-puller to remove it the 'proper' way... :P