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Teacake said..SP said..Captain Fin Tom . You're young use google

Yeah they are nice!
Would you agree with mac? A dolphin fin would do it?
I might try dads 9' fiber dolphin today, see how I go.
Tom.
Yeah, my rule of thumb is all fins need a wide base, it where the drive comes from.
After that, rolled rails and square tails get a D style noseriding fin. The Jai lee captainfin is what I have in my 10ftr, it has a bit of curve but is still very upright so it pivots and has lots of drag.
For boards with edge in the back 1/3rd, I reckon a dolphin style is to go. They have rails that want to turn or break out of the wave so once again a wide base and others have said a fair bit of area in the tip to hold it in.
Having said that fins are a bit of a lottery and what one person likes another doesn't and what works in one board doesn't work in another.
And finally don't be scared of big fins. Big single fin are great cause the extra depth is all extra hold.