Fin area vs wetted surface area.

[Retropete]

Read this on Real watersports website:
"Your fins are 50% of the wetted surface when you’re up and planning. When you look at the entire board and look at how “small” the fins are, it’s easy to convince yourself that it couldn’t matter that much, right? But when your board is up and planning, the fins make up 50% of the wetted surface of the surfboard/fin combo."

 

[retodd]

Well there's 6 or 8 sides of fin in the water most of the time , how much of the tail is in the water at any given time ?

Who much u weigh and how much volume is your board .

Good equation for the math people

 

[Luddite]

Read this on Real watersports website:
"Your fins are 50% of the wetted surface when you’re up and planning. When you look at the entire board and look at how “small” the fins are, it’s easy to convince yourself that it couldn’t matter that much, right? But when your board is up and planning, the fins make up 50% of the wetted surface of the surfboard/fin combo."

It's less than 50% most of the time surely?

 

[need 4 speed]

Agreed(for the first time) that number sounds a bit high to me
I'd say 30% max