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minimum tail width
Seems my 48cm is too wide for Shark Bay so a new 42cm board is being contemplated.

So how narrow can you go at the fin, before sucking air onto the fin becomes a problem!

Most boxes are set in about 9cm from the back, but I think width at the front of the fin would need to be more than that, as it's easier for air to travel sideways than backwards.
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Or... let us know if a problem, so we can tweak! 😅