New heatsink idea.

[thecrusader]

Originally Posted by nativepaul

To get decent flow though a duct the inlet, its area has to be at least the same swept area of the fan blases.

The outside circle is the same diameter as the inlet diameter paul. I see where your going with those fins. It'snot going to take me very long to machine this, so we'll see what happens. I think at some point I will de case the controller and try to figure out some sort of "clamshell" sink.

[nativepaul]

Outlet/inlet in this instance it doesnt realy matter, all the air that passes through the fan has to be either sucked or blown through the slots in the side/s.



In this pic if the purple has les area than the blue then you would probably be better off spacing your fan off from the heatsink like the red sketch and alow the fan to blow air over the heatsink as opposed to the green sketch which is what I belive you meant, flowing air through the channels.

I would use thermal epoxy to attach the heatsink to the case.

[zeropointbug]

That doesn't matter as much as you think, ALL heatsinks have a back pressure, you want 'some' restriction, as to increase air velocity.

But yes, in that pic, the outlet is too small, plus the fin design is not efficient, will not work very well.

The best design for a small add-on heatsink is RC-Monster. IMO