Quark 125B / Sky Technologies

[BrianG]

cadima, you are right; inside the Qaurk there are two thermal pads (about 0.5mm thick) which secures the FETs to the case and also transfers heat to the case. It's not perfect but it works ok. The best connection is direct obviously, but I'm thinking Quark wanted a way to firmly secure the innards to the case (and transfer heat) while allowing them to be removed for any repair work. Thermal epoxy works better by far than these pads, but it considered permanent. No taking it apart after that. Using epoxy would void the warranty.

After a while of track use, one or two people have seen the pads slowly get dusty and eventually seperate from the case. Obviously, this is not good for heat dissipation, but usually happens after the warranty is over. If this happens before the warranty period is up (90 days IIRC), I would send it back to Quark for repair. If out of warranty, you can do the mod if you think you can do it.

On my Revo, I did the mod since it was out of warranty anyway. On my buggy, I didn't touch the insides in case something happens. After a while, I'll probably do the epoxy mod to that one as well.

BTW: If you use normal CPU "goop", which is NOT adhesive, you'll have to find a way to somehow clamp the ESC down so it doesn't move around at all. Any movement will slowly render the goop less effective.