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Tri Fin winter project bored...err board 101
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U2U2U2



Joined: 06 Jul 2001
Posts: 5467
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Sun Feb 01, 2009 10:36 am    Post subject: Tri Fin winter project bored...err board 101 Reply with quote

The 1st photo is a Witchcraft Tri Fin, 2nd is a Tabou freestyle that has been modified , a set of surfboard thrusters in FCS base.

The FCS base is the easiest to install, a US or mini tuttle could be done as well.
The black Tabou fins are what came with the kit so cost concious and can be replaced by a higher quality fin, like True Ames.

The tri fins are suposted to offer upwind capabilities and sharp turning, they are not fast and said to require 24/7 attention.. intense.

The modifications are fairly straight forward, well seems, with the FCS system dropping into a hole you cut, and exoxy in. There are guides on where to place the thrusters.

I'm thinking about a allrounder as the candidate and about 100L, and probably have to consider it expendable.

Cost would vary, kit about 150, but all thats really needed are the FCS boxes and fins, everything else is available on line.

Appreciate ANY thoughts on the ramifications here .

Had problems with the site, but got the photos on, & question is I'm thinking about making the mod on a board ?

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Last edited by U2U2U2 on Sun Feb 01, 2009 2:13 pm; edited 2 times in total
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U2U2U2



Joined: 06 Jul 2001
Posts: 5467
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Sun Feb 01, 2009 1:34 pm    Post subject: Reply with quote


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U2U2U2



Joined: 06 Jul 2001
Posts: 5467
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Sun Feb 01, 2009 1:37 pm    Post subject: Reply with quote


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4Boards....May the fours be with you

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http://4boards.co.uk/
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isobars



Joined: 12 Dec 1999
Posts: 20084

PostPosted: Sun Feb 01, 2009 5:07 pm    Post subject: Re: Tri Fin winter project bored...err board 101 Reply with quote

Tabou~R2 wrote:
Appreciate ANY thoughts on the ramifications here .

Had problems with the site


The siteís flat busted. Itís been bad for weeks to months, but itís outright broken today.

Back to WSing Ö

I wrote this before you posted the pictures of the grove of trees youíre planning on your boards Wink but much of it still applies Ö or not Ö so here goes anyway [plus some updates related to big side fins].

I'd be quite surprised if simply bolting on extra fins would make a board do anything its hull was not designed to do, or do anything a bigger or different main fin couldn't do. I'd expect some subtle differences, if the extra fins were big (not just thrusters), but even then nothing significant unless maybe when WAY up on one rail so far a center fin would be out of the water. Even then the hull still provides traction/tracking/lift, as I'm often told my fin -- my ONLY fin -- is out of the water when slashing and in some jibes, yet all I feel is continued smooth tracking. [I plan to focus particularly hard on some of the wave-face cutbacks we see Kauli making in his twin-fin Cabo Verde video, to try to see how far off the mark my favorites are.]

I have many boards from the same shaper, with a wide variety of configurations. They include hulls channeled to focus the waterflow to thrusters, thrusters without the channels, removable thrusters, no thrusters, a variety of vees and tail kicks and rocker lines and tail widths and snub noses and square tails and tail thicknesses and ad nauseum ... but without looking down at my board mid-jibe or mid-maneuver or mid-reach, I'd be hard pressed to guess which board I was riding at the moment. The shaper likes to bash and slash and carve and twist and shout and jump and jibe in harsh terrain, so all his various boards behave very similarly within a general size range. I can switch boards, add or remove thrusters, move the fin and/or mast foot fore or aft, add pads, change colors, adjust my footstraps, change fin size, switch from port to starboard, and change underwear, but by far the most perceptible performance change comes from changing the main/center fin.

THAT I can feel without looking. Thickness, twist, flex, slots/no slots, planform, brand, finish, mounting rigidity ... every change matters, even though they're all wave/B&J fins of roughly similar sizes. People razz Bill Kline about his fin schtick, but even I have become a believer in his mantra: performance is 1/3 hull, 1/3 rider, and 1/3 fin. And for one rider, that bolls down to 1/2 hull and 1/2 fin. Take it step farther and eliminate hull changes and it's arguably all about the fin, and I think -- no guarantees here, just think -- that thrusters merely ADD performance decimal points, not SHIFT them, until handling challenges reach their limits. Full-sized side fins, especially on a hull designed with them in mind, can probably make a significant difference, but even that is not consistently shown in the very thorough Boardseeker twin-fin discussion.

I don't understand the "24/7 attention" comment, and have never perceived thrusters to slow me down in harsh terrain, where their extra tracking ability pays off with less attention to spinout. [3 big fins, however, surely must cost some speed, if thatís a factor in your objectives.]

OTOH, if the key words in your post are "bored" and "expendable", what the hell?

And, of course, I could be all wet. You may achieve wonders with your board. Let us know how it turns out, but watch out for the placebo effect.

Where's LeeD when we need his broad hardware experience?

Mike \m/
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U2U2U2



Joined: 06 Jul 2001
Posts: 5467
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Sun Feb 01, 2009 5:17 pm    Post subject: Reply with quote

thanks yea the site was really bad this am.

icesoobarRRs

couple points you made may be the most releverant, if it wasn't designed for those trees, then ....

if I find the right board to butcher up, going to have a go

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U2U2U2



Joined: 06 Jul 2001
Posts: 5467
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Mon Feb 02, 2009 7:12 pm    Post subject: Reply with quote

kind of disappointed that reply's are like hens teeth here,

NASA rocket science no, may work, not work , are you out of your fOcking mind Dude ?

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Wind-NC.com



Joined: 30 May 2007
Posts: 979
Location: Formerly Cape Hatteras, now Burlington, VT!

PostPosted: Mon Feb 02, 2009 8:14 pm    Post subject: Reply with quote

I could see a surfboard thruster setup working on a lightwind wave board. 100 liter schlog board, for use with a 4.7-5.5 in 8-20 knots or so. I'm talking three tiny surfboard fins, not 2+1. It probably wouldn't plane that well, but in light wind, who cares? And if the wave faces are glassy, sideoff conditions I bet it would work sweet!

Chop might present an issue in higher winds...

The idea of planing without a wave face might also present an issue...
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U2U2U2



Joined: 06 Jul 2001
Posts: 5467
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Mon Feb 02, 2009 8:43 pm    Post subject: Reply with quote

thanks Andy,
Try to bring it to Avon

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jingebritsen



Joined: 21 Aug 2002
Posts: 3347

PostPosted: Tue Feb 03, 2009 5:08 am    Post subject: Reply with quote

Wouldn't extra fin on any board lead to it slowing down? The old lift to drag thing comes to my mind. I see lots of folks going too slow to plane thru jibes partially because they have those gi-normous weeders down here in FL. The surface areas on some weed fins is way too big. If you are on very very large waves with a very fast break, maybe more fin would help? Mike made some good points. Gotta have speed and glide to do what we do.
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scooper



Joined: 28 May 1987
Posts: 537
Location: Massachusettes

PostPosted: Tue Feb 03, 2009 7:48 am    Post subject: Reply with quote

I love my RealWind 85 liter board with 8" flexi top wave fin and thrusters! I agree that the difference between sailing it with and without the thrusters is subtle. I certainly don't notice any loss of speed. Sometimes I wish I did. For me, when really powered up (35 or 40 mph and up) this board is scary fast. It feels like there is almost nothing left in the water. That's when I feel that the thrusters give me a slight edge at holding it together.

I'd love to try that board that has the 3 white fins, not thrusters. It could be the ultimate upwind machine for shallow water. Or it could suck.



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