There are a few things that strike me as odd abut the Icetank design, and I must attribute it to looks. Namely, the rounded off edges of the heat sink could be easily eliminated with very little loss of performance, since they aren’t within the air flow path of the fan. Also, placement of the copper fins should be near the edge of the fan, not in the middle, because that is where the air velocity leaving the fan is greatest, and where having a higher thermal conductivity material would be most beneficial.
