Brushless Cooling.
 

I have recently REVIVED my brushless E-Maxx. I am running a C40 with Hacker controller.

I used to have a computer fan (Thermaltake Smart Fan II 80mm) straped on with zip ties:D but i had an accident or IT had an accident and fliped over, lol, and IT forgot to remind me to put on the body shell on it, so the fan broke.

I have just started running it and the motors are getting too hot ( i used to be able to hold my tounge on it for 3 seconds but now, a mere 2).

I was really hopeing that you guys had better ideas on cooling the brushless and the controller. better fans or placement of fans, heatsinks????

Just out of curiosity has anyone ever run or seen a watercooled brushless, if so, is it practical?

thank you for your consideration,

Mark

I seen a water cooled brushless boat. What temp does your tongue tell it is running. I heard of the finger method never the tongue. That is a new one. If it is not running over 170. You in good shape. 170 is warm to the human touch. Hot water out faucet is about 110-120.

Which C40 is it? I hope it is a "L"...

how would you check the temperature?
the motor and controller and batteries all get hot.

OHHH my bad its a C50...

You can get a infared temp guage for 25-30 bucks. May not be perfect but is easier than the finger or tongue. Just point and shoot. Bam you have the temp.

:L: Reminds me: ever checked with your tongue if a batt is full??

I like doing the 9v best.

ever tried 7 cell ultra metal 3000's??? ther the best :D

Mark, do you know about Mikes heatsink/clamp? Will this fit your motor? If it is a regular 36mm diameter motor it will fit.
This wonderfull thingy allows you to mount a fan directly to it. 2mm screws just grab nicely inbetween the fins.

As for the ESC, a fan never hurts. I like them directly on the heatsink.

Here's some of my stuff. Most people here have already seen this pics. Anyway, just to give you an idea
On a Warrior
Top view of my truck
Another view

I like the dual fan mod for the Warrior. Mine gets pretty hot out here in the AZ heat. Time to look for some micro fans! How did you secure them to the ESC?

I've never heard of using your tongue to check the temp I will let you guys try it first.:D
Dafni, those fans look nice!! Do you put your tongue on them to check the temp.:eek:

Thank you,
Promod

No, I keep it in my mouth. Don't like the taste of RC's :L: Plus, I have an IR temp thing.

The fans are haeld to the ESC by 3mm screws. They just fit between the heatsink-fins. (Much in the same way as 2mm screws would fit on Mikes heatsink)

Hey daf

How well do those 3mm screws hold on the heat sink ?. Have you had any crashes yet ?.

Crashes?? Yeah, plenty. No issues with the fans.
If you take the proper lenght, they hook up nice. In the shown case, I glued two fans together, and used 3 screws. I can actually pull hard on them. It works fine.

I've alway's had my doubt's about fan's on motor's. I tend to think 1 side is cooled while the other is still hot. Is this true? Or doesn't it matter much? And do those 4 fan's suck up allot of power? I run a 5 volt fan on my hacker comp which keep's it cold but I also want the c-50 cooler and may get 2 fan's for them as well. Right now I use 2 540-can heat sink hold down by ty rip's(don't you just LOVE ty tip's) but I don't know if it really bring's the temp down.

http://groups.msn.com/sneeck101/shoe...to&PhotoID=193

The fans on my motor give me more than 10 degrees celsius advantage. Even more, I think.

It only cools one side of the motor, but heat is conductive. Some smart guy once told me: Daf, if you heat a piece of metal on one end, it gets hot on the other, too.

Getting rid of heat is a good idea, but it's even better to choose a setup that's not too "close on the border".

I prolly should get a temp gun first, but i'm a bit low on fund's right now. But if you drive your truck very hard, like constant speed run's, you will eventually get the motor to overheat. allthough I don't usually drive like that, I want to be on the safe side.

Actually, I CAN run my truck very hard. Even on big tracks it wont get in the dangerous temp regime with proper gearing.

Yes but are you getting allot of speed?

Speed? I can't complain.
I gear my Revo for 35mph or 40mph on 14 cells. And that's plenty for me.

I just came back from a test run, all in the name of science:
On my lawn (not the shortest grass) with 1:18 reduction, plenty of full speed passes, I ended up with 140 degrees farenheit after a full run.
Amazing, IMHO. It's all about efficiency and proper gearing.

Hey guys,

thanks for all the info so far.

i looked at mike's heatsink and i KNOW i found a fourm where the size is located but i cant seem to find it again. The C50 is 43.2 mm diameter, which includes the already built in heatsink. which leads me to my next question

Which is better, a heatsink on the motor or a fan? on my stock emaxx i have heatsinks... i think they are trinity...
and on my 7 cell one i have a gigantic fan.

Dafni, what gearing are you running at the moment?

Thanks so far everyone,
Mark

Fan help's way more.

Dafni,

That sound's great. Going to try and find out what the best set-up for my c-50 is.

Mark, I'm running a 1:18 reduction on this truck. (7XL, stock tires, 14 cells)

1:18 overall = 18/66

17/72 w/ ue 8 spyder's. And I got a set of 40 serie's, not tested them yet.

@sneeck.. Cheyennes!!!??!!

I hear you Sneeck, about the temp difference when you cool it on one side.. BUT.. the material it's cooling (copper with flexible isolation and aluminum) is rather soft, so it can easely withstand a difference in temperature.

Daf, a bit of an idiot question here, but you have the fans on both the motor and controller aimed so that they blow air DOWN onto the surface, correct? I had zero luck a while back trying to make an exhaust fan for my Novak SS in my Pede (stupid thing LOVED to overheat), but I'm guessing ramming air down onto it would be better. :)

I think I'll try this in both my Ofna 9.5 and T2, the 7018 in the T2 likes to run hot anyway.

it needs to blow, not suck.. vacume air can transfer less heat than compressed.

So.......pointed DOWN with the airflow going onto the controller's heat sinks, correct?

Yeah.. Blow.. don't suck...

Rene, no I got a set of velo's w/ bowties. I hope they don't woble to much, or I have to switch to Cheyennes. Like them much better too.

I'll give them a test run when I receive your diff cup.

Dabid, we already talked about this a while ago. Serum's right. If the air is blown on an object, you have more actual contact between air and surface. Thus the heat exchange is better.
If you suck air over it, the air will find the route with the least resistance. Which is not directly ON the surface. (in fact, theoretically, the air molecules that sit on the surface would not move at all)

-dafnerd

So true, so true! ;)

Yeah, I vaguely remember you saying to have them blow down onto the controller heat sinks, but was unsure of what to do with the motor.......d'oh!

I see. I'll let it slide this time :p Good excuse, though :L:

Best advice I've seen on these boards :D

It's all coming from Holland..

Land of the mills, clogs and good advices..

ROFL

I saw this one coming.

Dafni, is that 40mmx40mm fan that you put on you 9920? Looks cool. Im planning to put that on my 9920 (when mike has them in stock) 40mmx40mm is the smallest fan I can find at the moment.

Dafni, is that 40mmx40mm fan that you put on you 9920? Looks cool. Im planning to put that on my 9920 (when mike has them in stock) 40mmx40mm is the smallest fan I can find at the moment.

And 1 more question, I've found a powerful 40mm fan with 11.48cfm and 9200rpm. this is the highest cfm and RPM ive seen so far for a 40mm fan. But the problem is, it has 3 leads (pins). I know that most u use the fans that has only 2 leads, +ve and ground. can I still use this? How can i connect the fan with the rest of the electronics?

This is the fan that im talking about.

http://www.newegg.com/Product/Produc...01#DetailSpecs

Not sure on the 3 pin connector, but it surely can be hooked up. I have some 12 volt, 2 pin fans if you need them.

To demonstrate the cooling effoects of suck vs. blow, think of a hot day. Which side of the fan do you stand on to cool down? The air blowing over you cools much better than standing behind the fan! Same principle.

Thanks mike. Are you refering to the "cfm" when you said about blowing and sucking? I thought the cfm value shows how much air the fan can blow..