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Bob, I've had them out in beachbreaks from dribbler to head high on a glass paipo and a surfboard and it's the same experience of lots of drive for little effort. Standard surfboard fins try to be good at everything but this one is just for getting down the line with the least effort.
The posts on this set are 12 x 3 mm but I'm doing 6 mm round posts for the next ones. You'd think the posts would create a lot of drag. but they don't.

I'm enjoying how these fins ride. You don't have to design them like a Wing added onto a plane but more like an individual entity, it is its own craft. The central area is like a foiled fin but the angled sides are thinner and designed to provide a Newtonian hydrodynamic effect.
They're very stable but I think I can improve them with a few small changes.

More testing today on my DIY paipo. Lots of good things about the new fin design but there's always more to discover.
New fins to come...