Kobuchi's point still stands: it's an interesting method that can be used to build a block (just not this one).
In that perspective, I'll bring up again, the ideal ratio that Cathar spent so much time figuring out, for the White Water design (only):
fin-to-channel
between
1:1.5
and
1:0.75
An air sink would have a ratio around 1:8 (typically).
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