I was going to mention the fact that the fins are continous throughout, in both designs, but I'm not completely sure what to make of it.
You mention a 1 1/4 center on the 5x10, and a 1" center on the cube. I understand the meaning: 1" from center of tube, to the center of the next tube.
What puzzles me is why these fins would be continous throughout the whole cube (if in fact they are): wouldn't that limit the dispersion of the heat from the tubes?
By extension, wouldn't the 5x10 benefit from a saw cut into the fins, between the tubes?
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