Questions on heat

[Serum]

I would use a 7812 voltage regulator (to220 housing). and use the two fans parralel.

The fan i used is a 30X30mm fan.

It was a perfect fit though. make it so, it blows over the heatsink, not sucking.. pressure cools better than vacuum.

[Dafni]

to220 housing? Can you please explain this?

Can you post a pic of this regulator?

How about wireing in paralel, using the 14 cells, and add a suitable resistor??

Eitehr way, you solder it to the input wires of the ESC, right?

I have a fan on my brush Maxx, and I use a separate 9V dry cell:o

Will get back to you on this tomorrow.

Thanks so far guys, especially you, Serum. Nice talking to you.

DAF

[Serum]

That's okay Dafni!

TO220 is a type of housing for transistors and fetts.

Look here for detailed instructions.

You can use the power that comes from the 14 cells. So it is the best, to connect it to the side of the esc. (when you plug the batteries in, it directly powers the fans as well)

[Dafni]

Great! Watch out for my modded Warrior. I can see the picture clear in my mind. Should turn out nice and clean. Let's see.

I had a close look at it yesterday, and I think it's do-able for me. I will order the needed stuff today.

[Dafni]

Okay, here's my fan mod.
I did one with regulator, and one with just a resistor. Both work well, but for reasons of "clean-ness" I'll stay with the resistor.



The airflow is not hindered. The outflow goes thru the end of the heatshrink, where the cables and caps are, and thru some holes I made.

Please tell me what you think.

[Serum]

That background is quite impressive.. ;)

It is clean, no doubt. It's cleaner than with the regulator. I see what you mean.

did you glued them on?

[Dafni]

The fans are held in place by this 3 screws you can see on the upper edge. Fortunately 3mm screws fit nicely between the fins of the heatsink, they kinda cut their own thread.
A nice feat, I think. No glue or messy stuff involfed, and you can remove it (almost) without a trace.

Ja, the Periodic Table of the Elements has something to it:D

On the subject of heat, what would be too hot? I ran a 6 cell pack geared 21/84 and the motor temp after the pack was drained was 151 F. I dropped to a 19 tooth pinion and the motor temp was 115 F. What temps max should I be trying to stay under in my Stampede with the Feigao 8s?

[RC-Monster Mike]

Neither of those temps are too hot. Keep things below 180 or so and you won't have any trouble. 115F is cool! 151F is no problem at all.

[Dafni]

Mike, I usually end up with my 9L at 190°F, geared 16/72 :eek:

Another thing, much more worrying: My 9918 with the dual fans stays nice and cool on the upper side, but I noticed it gets hot on the underside. It is mounted on some velcro (plus zip ties, of course) and sits on a sheet of alu.
Yesterday, it was a really hot day, it thermaled!! Temps on the heatsink barely above 100°F, but it was hot underneath.

What can I do there? Any ideas?

Another small fan underneath it? Maybe one of those small fans made to fit a PCI opening on the back of your computer would work there, one like this. Or maybe moving the fans you have now from the top to the side to blow air over the top and bottom would do the trick? I never thought to check the underside of the ESC, I'll be checking mine next run after I replace a broken camber link. Maybe this time my Pede has learned now that the curb is always gonna win.:D

[RC-Monster Mike]

Perhaps a few air holes in the aluminum it sits on could help as well. You are a special case, Daf! I have yet to thermal a warrior, and I have run 14 cells on an 8l with 45+mph gearing on a race track in the summer! I usually mount a single fan over the heaytsink(fan is a bit wider than the controller, so it blows air around the whole controller).

[T2693]

What's a fan setup run, cost wise? Installation difficulty?

[RC-Monster Mike]

A fan is less than $10. Easy to install as well. remind me and I will get one in your package.

[T2693]

You the Man! Thanks!:D