Another one has let the smoke out

[coolhandcountry]

Well I had alot of smoke come from under the body today. :013:
It really had me worried. I was thinking my limns.:002: I took a couple pics of it. On the truck and off. Do you think it is a bad esc? :032: :005:





Now for the job of dealing with getting it fixed or just get a new one. :mad:1 :mad:1 :007: :007: :002: :002:

[squeeforever]

Did you change anything from before?

[Nick]

I'm well nervous, just orderd my 2nd one after last smoked, I'm so scared it might happend again. Spent every last penny getting a new one. :(

[Serum]

Are those wires on your motor unisolated Leroy?

[squeeforever]

It sure appears that way.....

[coolhandcountry]

but they don't touch so it is good. I didn't change a thing. I want that long in my play sessioin either. gee The bk is not looking good.

[BrianG]

Wow, that sucks. Too bad you can't stuff the smoke back in! :)

Seriously, I always worry about that happening to mine. That's why I get an ESC that will handle at least 50% more current than the motor requires. I took the shrink off my BK 12020 and noticed the FETs are stacked with a layer of PCB in between. Each layer had heatsink grease, but the layers were not closely mated, so the heat on the lowest level is the highest and is the most at risk of thermaling. The little heatsink they do have is only on the very top level.

I think some of the problem with these ESCs (BKs in particular) is the fact they make them as small as possible so the heat is too concentrated, even with a heatsink. I wouldn't mind a bigger unit if they would increase the reliability. Or, even a 2-part ESC; one part for the "brains" and current sensing which would keep the processor and other related components cooler, and another part for the high current output FETs that use larger TO-220 (tab style) devices individually heatsinked so the heat is properly dissipated and replacement is much easier for the normal person. Plus, a 2-part design would isolate the "smoking" part.

[coolhandcountry]

Does any one have a suggestion on a new esc? I was thinking the 125b quark. The mgm 24160 looks nice to. It may be a find esc for the 2250 to. :D

[BrianG]

I haven't run my Quark 125B yet, but I am much more impressed with the construction and implementation. There are a ton of programming options too, one of which you can set how aggressive the throttle is, since the most current is drawn on takeoff. Stopping power can be set too, which is another high current operation. There is even a battery setting where you set if you have normal or high-perf batteries, presumably so the ESC reduces the current spikes to help protect the batteries (which would therefore help protect the ESC as well I would think). Pretty nice.

[Nick]

Quark looks very durable. It is probably the next one I will consider, that or an MGM.

Seems BK are having a few 9920s pop lately.

[Sylvester]

i am scared about my 9920 now! Sorry what happened to you leroy! Im getting a quark 125b if i fry this 9920!

[MetalMan]

There goes another one... Just make sure you let us know how long it takes for BK to service it!

I'd go with the Quark 125. They have offices that can do repairs in Southern California, so you don't even have to send anything overseas! Besides that, I haven't heard of one smoking yet.

[coolhandcountry]

Yeah but long time ago i did hear of bks smoking either. The quark is so new it kind of has me worried to get it. I ordered up a 24160 mgm. I figure i can put the 2250 on it later. :D

It is going to head back to mikes tomorrow. So not sure when mike will send it back to them.

[Romster]

just wondering which BK smoked up the BK 12020 or the BK 9920?

[coolhandcountry]

The one in the pics is a 9920. I have a 36120 as well. I think this is #3 I have let the smoke out of. One is in germany now getting fixed.