13 November 2015
The method and figures described below were inspired by the original rail profile design method found at this link:
This solid green shape was my first attempt at an ellipse-based rail profile. I was not satisfied...
21 November 2015
Ellipse-Based Rail Profile (Refined)
Board Thicknes = 3 inches for this example
* Red rectangle = 3" x 6"
* Large Ellipse (green): Height = 2 x 0.618 x red rectangle height; Length = 2 x ellipse height
* Small Ellipse (purple): Height = 2 x 0.382 x red rectangle
height; Length = 2
x ellipse heightEllipse-Based Rail Profile (Refined)
Board Thicknes = 3 inches for this example
* Red rectangle = 3" x 6"
* Large Ellipse (green): Height = 2 x 0.618 x red rectangle height; Length = 2 x ellipse height
* Align ellipse (horizontal) midlines at 0.382 x red rectangle height (top of blue rectangle). Ellipses are tangential to the left wall of the red rectangle.
Vary ellipse lengths and/or alignment of the ellipse (horizontal) mid-lines at new percentages of rectangle heights, to create different rail profile shapes. Ellipse heights must be adjusted to conform with each new percentage of rectangle height.
Links to the other elliptic surfboard design posts:
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
Elipse-based fin
http://ellipticsurfboard.blogspot.com/2016/03/ellipse-based-surfboard-fin.html
Ellipse-based tail template
http://ellipticsurfboard.blogspot.com/2015/11/ellipse-based-tail-templates.html
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