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azymuth said..
What do you make of these bubble blasts 1-2m behind the foil?
Yes, what's that? Could be related to the Karman Vortex Streets but the spacing is a lot wider. It seems to be at about the spacing of the chop. Maybe an interaction between the wake and the chop? Von Karman, rated as the #1 aeronautical/fluid dynamics geek of the 20th century, could tell us if it is something new to science, deserving to be named after the discoverer.
Is that the same phenomenon at 20 seconds?
( I've watched it all thru a few times now. 10/10 for artistic merit JJ. )