Thought I knew aboit surfboard design then I ran across this term on the CI website. Says the Gen 2 Signle Fin uses one.
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What is a "spiral vee"?
- Thread starter luvtosurf77
- Start date
Just an optical illusion of a double concave where the template and rocker blend to make it seem the concave max depth goes like an arc, heading the direction of water flow.
Just having the tail rocker, the V in the board gets flat out the tail, so double concaves take on a wierd, surreal look with a wide, curvy, template.
Just having the tail rocker, the V in the board gets flat out the tail, so double concaves take on a wierd, surreal look with a wide, curvy, template.
looked to me like it was a double concave, but the center was higher than the outsides, like a vee is...
Upside down, the stringer is ALWAYS higher than the rails, as you first have to start with V, then put in the two concaves.
In all surfboards, all sailboards, all kiteboards, and all wakeboards.
There is no reason to keep the stringer flat with the rails, and introduce concave, because you might as well go full rail to rail SINGLE concave!
In all surfboards, all sailboards, all kiteboards, and all wakeboards.
There is no reason to keep the stringer flat with the rails, and introduce concave, because you might as well go full rail to rail SINGLE concave!
and I thought it was a just another yuppy word for something irrelevant. <img src="/forum/images/graemlins/shrug.gif" alt="" /> gee I learn something new every day..
Methinks we are all saying the same thing <img src="/forum/images/graemlins/grin.gif" alt="" /> <img src="/forum/images/graemlins/grin.gif" alt="" />
I DO like Roys summation the best tho!
I DO like Roys summation the best tho!
http://www.ksusa.org/Forum/viewtopic.php?t=858
more here about Spiral Vee than most anywhere else.
Dont step on the daisys!
more here about Spiral Vee than most anywhere else.
Dont step on the daisys!
I don't think any of them really got it. People are all hung up on the concaves, which need not be there. Spiral Vee was introduced by Terry Fitzgerald in 74, it is a hull design specific for single fins.
Start with a flat bottom. Then, in front of the fin, introduce spiral vee (something like 1/8" to 1/4" deep). The Vee peaks in front of the fin and flattens going fore and aft.
The purpose is smoothing the rail line. The rocker goes from pretty flat in front of the fin to substantially more curved behind the fin. The spiral Vee softens this transition, so the curve in rocker at the rail is more gradual.
http://www.surfresearch.com.au/1976o1201mct_classic_backdoor12_40.html
Start with a flat bottom. Then, in front of the fin, introduce spiral vee (something like 1/8" to 1/4" deep). The Vee peaks in front of the fin and flattens going fore and aft.
The purpose is smoothing the rail line. The rocker goes from pretty flat in front of the fin to substantially more curved behind the fin. The spiral Vee softens this transition, so the curve in rocker at the rail is more gradual.
http://www.surfresearch.com.au/1976o1201mct_classic_backdoor12_40.html
I think I understand. So spiral vee is a vee that starts in front of the fins then gradually becomes less pronounced towards the tail?
The Vee exists at the point of transition from flat bottom to curved tail. The hull is increasingly flat going forward and backward from the peak of the Vee, which is under the back foot (or just in front of the fin).
Jim Phillips tried to explain how the spiral got in the name once on Swaylocks, but I didn't follow. I'll have to track him down at the factory when I'm in SD later this month. There's some angle by which you look at it and see a spiral...I think.
Jim Phillips tried to explain how the spiral got in the name once on Swaylocks, but I didn't follow. I'll have to track him down at the factory when I'm in SD later this month. There's some angle by which you look at it and see a spiral...I think.
so basically we could all be shaping these hardcore "spiral vee's" into our tails just by smoothing out the rocker and transition from vee to flat? <img src="/forum/images/graemlins/grin.gif" alt="" />
From flat to V to almost flat again, with the tail rocker.
It's the OPTICAL ILLUSION thing going on, looking from several angles, you will see it.
It's the OPTICAL ILLUSION thing going on, looking from several angles, you will see it.
I don't think too many think of spiral vee as hardcore. It is, in most incarnations, only subtly different from dead flat.
On a singlefin, you have no rail fin. The shape of the rail has a much bigger impact on performance than it does on a board with rail fins. The rail thickness, amount of curvature from the fin forward, how far forward you carry a hard rail, the rocker from the fin forward, and the bottom contour, all come into play.
LeeD, weren't you done shaping by the time Spiral Vee was introduced in 1974 ? <img src="/forum/images/graemlins/shrug.gif" alt="" />
On a singlefin, you have no rail fin. The shape of the rail has a much bigger impact on performance than it does on a board with rail fins. The rail thickness, amount of curvature from the fin forward, how far forward you carry a hard rail, the rocker from the fin forward, and the bottom contour, all come into play.
LeeD, weren't you done shaping by the time Spiral Vee was introduced in 1974 ? <img src="/forum/images/graemlins/shrug.gif" alt="" />
I think my production years were from '73 to '78.
Meaning I started Jan. '73 still making boards out of my garage.
The factory moved from Wawona St. to 3rd and Underwood when I was still recovering from the tib/fib.
Not saying I shaped good boards, but one week, I actually shaped 3 a day for 5 days straight, which also meant 5 straight daze of bike riding from 45th/Santiago to the factory, no mean feat. <img src="/forum/images/graemlins/grin.gif" alt="" /> <img src="/forum/images/graemlins/grin.gif" alt="" />
Meaning I started Jan. '73 still making boards out of my garage.
The factory moved from Wawona St. to 3rd and Underwood when I was still recovering from the tib/fib.
Not saying I shaped good boards, but one week, I actually shaped 3 a day for 5 days straight, which also meant 5 straight daze of bike riding from 45th/Santiago to the factory, no mean feat. <img src="/forum/images/graemlins/grin.gif" alt="" /> <img src="/forum/images/graemlins/grin.gif" alt="" />