5.25.2010




greenough velo template + mirandon split-tail  = 5'1" arc-swallowtail quad :)

11 comments:

Oldhack said...

the velo template was only wide in order to flex and bend into the correct shape. A foam, static version will have very little to do with making anything work even remotely close to a velo, but it is a pretty curve nonetheless.

M.CARO said...

Please see next post for a more detailed image of the outline and geometry...

M.CARO said...

The bottom contours are pretty much the same as my "regular' quad fish -- single concave to spiral vee.

In answer to the "sacrilege" comment, there's actually a lot of geometry involved which defines the arctail and split tail area.

With infinite respect to George Greenough, it's common knowledge that he used a trash can lid to template the arctail of his Velos. In homage to him I've also used this method in the past to template the arctails on my hulls.

For this 5'1" Arc-Swallowtail, I wanted to find what might be the closest thing to "sacred geometry" in this design. So I first built the foundation dimensions of the tail with an equilateral triangle which defines the width of the tail at its widest point. Since all sides of this equiangular triangle are equal in length, this length also defines the radius of the circle which transcribes the arctail. The length of the equilateral triangle (and the radius of the circle) is 12".

The foam removed for the swallowtail is an isosceles triangle whose vertex is one half the angle of the equilateral or equiangular triangle, one half of 60º, which is 30º. The length of the base of this isosceles triangle is one half its height, in this case 4" wide and 8" deep.

There is a relationship between the numbers here: 1, 2, 4, 8...

These relationships are proportions which can be used to scale the design up or down depending on the length of the board.

Is this "doing my own thing?"

John said...

I second the radical comment! Doing your own thing is making boards you like for you to ride. From wild and weird electrical impulses in the brain to paper to foam and fiberglass. Go Manny!

Now as for the size, could you make it a little bigger so I can ride it? Maybe 5'4"+???

Surfy Surfy! said...

Cool board. I want one.

wailakihawk said...

Just give up already, move to the woods and live in a van with your dog. JEEEZ!

wailakihawk said...

Kidding of course, I want one too. Variety is the spice of life, not one board is the same, even if made by a machine...

"Looking at the bottom, what do I see
I see the bottom staring back at me
You have to be part animal part machine" - Henry Rollins

Greg Lantz said...

the people with negative things to say, always say it anonymously. if you wouldn't say it to someone's face, then don't say it at all. and if you can't say it with just a screen name attached on the internet... well then that is just pathetic.

oldhack said...

that wasnt a negative comment, just an informed one because i think the greenough name and ideals are being tossed around pretty carelessly as of late.

greg.lantz said...

sorry. oldhack i wasn't referencing you. just some other posts on the blog from folks without screen names.

Thurman said...

This is fantastic!