I have found a way to easily and succesfully cool hub motors

[ebikedelight]

If both heatsinks are being bonded to something with uniform heating, and the thermal resistance of the bond is the same between the two, the thinner backed heatsink would be the highest performance, as it has less Rth induced delta-T through the aluminum itself.

Get both and try both if you care enough.

Thanks..this is what I assumed would be the case , but when it comes to thermal heat dissipation , sometimes common sense doesnt align with real results.

 

[Kyle201]

So obviously copper has a higher thermal conductivity. Doing some reading on heatsinks, a lot of people are saying how copper absorbs heat quickly, but releases it slowly, where aluminum is somewhat the opposite and can release heat better. Would there be any benefit to using a thin copper shim at the base of an aluminum heatsink? You can get them in different thicknesses, like 0.4mm - 1mm or so. Thinner better? Any point in trying that even? I guess there would have to be two thermal adhesive bonds instead of one in this case, which might cancel out any benefit?