I started working on the ellipse-based fin concept in April and May of 2015 as posts in a thread at swaylocks.com.
A NACA 0009 foil profile was used.
FinFoil CAD diagrams and the first CNC shaped protoype of my elliptic fin design below are courtesy of JRandy at swaylocks.com.
Computational Fluid Dynamics figures below for the fin design were created by Hans at swaylocks.com.
http://www.swaylocks.com/comment/512804#comment-512804
Links to the other elliptic surfboard design posts:
Ellipse-based rails
http://ellipticsurfboard.blogspot.com/2015/11/ellipse-based-rail-profile.html
Ellipse-based rocker
http://ellipticsurfboard.blogspot.com/2015/11/ellipse-based-surfboard-rocker_13.html
Ellipse-based planshape
http://ellipticsurfboard.blogspot.com/2015/11/ellipse-based-surfboard-planshape.html
Ellipse-based tail template
http://ellipticsurfboard.blogspot.com/2015/11/ellipse-based-tail-templates.html
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