Custom (very) Quark esc heatsink...

[zeropointbug]

Originally Posted by BrianG

Yeah, material does matter. I can see copper having better results with longer fins while aluminum having better results with shorter but more numerous fins...

It wouldn't make much of any difference using copper fins rather than aluminum fins. I've seen this lot's with CPU heatsinks, copper version of the very same one, was only 2-3 C lower temps than aluminum one. The most important part is the heatspreader, which SHOULD be copper, as that is where the highest heat density is, right?