Custom (very) Quark esc heatsink...

[zeropointbug]

It's not that longer fins don't work as 'well' as shorter fins. If you want to look at it another way, from heat source, one side of fin, and temp measurement other side, it will lower the longer the fin. Longer fins will work better, only marginally better though. Heatsink design really is tricky, now there are fancy heatsinks (for CPU's) with a bunch of heatpipes and large amounts of fins. Heatpipes, if you don't know what they are, have distilled water, or alcohol under very low pressure, which vaporizes at a very low temp, which you know phase change takes alot of energy. Also, unlike a solid piece of metal (such as copper), heatpipes thermal resistance decreases as length is increased.

For this heatsink, it's good that the fins are of decent length, for one: to catch air, and two: inside the fins, there is a certain amount turbulence which spreads around the heat energy down the length of the fins.

I am thinking of mounting it in front of the transmission right behind the front shock tower. If not enough room, other side of chassis, where it will still get enough airflow.

I just did a little experiment with a 600 watt heatgun, with a low speed fan. With the heatgun of the heat spreader for almost 1 minute, with the fan running (rated 19cfm), after this period, the heatspreader was quite warm, I would guesstimate it was 45C (113F), and VERY quickly cooled down to room temp within 15 seconds.

Not convinced yet? :032: :005: