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Trifin
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mchaco1



Joined: 08 Sep 2010
Posts: 643

PostPosted: Sun Jun 24, 2012 5:18 pm    Post subject: Trifin Reply with quote

I was cleaning up my old boards and looking at my poly board that Ive been waiting to get good enough to use... Its about 90-95L and from the ealry 90's probably. Ive only tried it once with a single fin and I think it was too underpowered that day. I was wondering what effect using the all three fins would have on it, mostly in regards to upwind ability and ease of getting it up out of the water and on a plane. Are the extra little fins going to drag it down or is the extra bite going to help get on a plane?
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isobars



Joined: 12 Dec 1999
Posts: 13808

PostPosted: Sun Jun 24, 2012 6:00 pm    Post subject: Reply with quote

Thrusters (those small side fins) aid maneuverability at the extremes, not planing or pointing/pinching upwind.

Mike \m/
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mchaco1



Joined: 08 Sep 2010
Posts: 643

PostPosted: Sun Jun 24, 2012 7:45 pm    Post subject: Reply with quote

Will they hurt early planing though or just not make any difference
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isobars



Joined: 12 Dec 1999
Posts: 13808

PostPosted: Sun Jun 24, 2012 10:07 pm    Post subject: Reply with quote

I'm no fin theory expert, but I'm pretty well convinced afters scores of thousands of Gorge miles on thrustered boards, then thousands more on the same shapes without the thrusters, that their primary -- essentially only -- effect is on tracking and control when pushed beyond the maneuvering limits of single fins by ordinary sailors with imperfect technique. Pushed to only 90% OR ridden by truly expert sailors, they make minimal difference of any sort. Once I brought my skills up to the ballpark of boards like these, the thrusters became moot most of the time. Their most obvious boosts then, for me, were for superior control at high speed in extremely overpowering conditions in extremely harsh terrain, sticking sideways jump landings deliberately with no spinout, preventing and recovering from spinout when I screwed up, and carrying bigger sails with full control than could other boards of similar volume. Generally speaking, the primary function of thrusters is to boost lateral bite when the board is way up on one rail pulling high g's in rough terrain.

Caveat: I'm talking small thrusters like you probably have, not newer boards with three or four bigger fins. But even then, in my own professional head-to-head comparison of half a dozen thruster boards for a high-performance Gorge gear magazine on a full-nuke day at the Hatchery, the differences among those boards was night and day due to design; thrusters alone do not transform an ordinary hull. Shape still matters very dramatically. Also, my comments apply mostly to one specific brand and style of thrustered board; I never found any other marque that even came close when my lead foot and amateur skills pushed them in any of those performance regimes I mentioned.

For your goal of planing sooner, your path includes bigger sails, bigger fins, far better technique, tons of TOW, and sufficient volume. Sure, hulls designed for earlier planing plane earlier, but around here you don't need to spend $2,000 to plane; the much cheaper path above should suffice, and won't beat you up in the chop.


Last edited by isobars on Sun Jun 24, 2012 10:42 pm; edited 2 times in total
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westender



Joined: 02 Aug 2007
Posts: 610
Location: Portland / Gorge

PostPosted: Sun Jun 24, 2012 10:09 pm    Post subject: Reply with quote

So you're not going to try it to see for yourself ?

Some people spend half the day screwing fins on and off?

?
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mchaco1



Joined: 08 Sep 2010
Posts: 643

PostPosted: Sun Jun 24, 2012 10:42 pm    Post subject: Reply with quote

westender wrote:
So you're not going to try it to see for yourself ?

Some people spend half the day screwing fins on and off?

?

I certainly will, but I have limited room on top of my car and I would have to leave one of my proven boards behind to take this and try it out (and it would have to be on a good high wind day). I just wanted to check and see if the tri fin was worth trying or if it was completely opposite what I wanted. Sounds like its worth trying though.

Im still looking for a van so that I wont have to pick and chose what to take
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isobars



Joined: 12 Dec 1999
Posts: 13808

PostPosted: Mon Jun 25, 2012 12:18 pm    Post subject: Reply with quote

To give you a target, once you get used to 90-something liters, a 6.2 day -- 20 mph average -- is plenty.
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U2U2U2



Joined: 06 Jul 2001
Posts: 3053
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Tue Jun 26, 2012 10:03 am    Post subject: Reply with quote

A 3 fin will go upwind better
You can start closer to the beach. It will have more drag less top speed
BUT their are too many variables on things to make more specialized comments.

IE. the board..size fins..toe in ..fin shape...fin profile...

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noshuzbluz



Joined: 18 May 2000
Posts: 771

PostPosted: Tue Jun 26, 2012 1:45 pm    Post subject: Reply with quote

For you OO riders. If you want to go without the side fins, check with Brian. He will have plugs to fill the void. Basically a base without a fin that work pretty sweet.
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WMP



Joined: 30 May 2000
Posts: 607

PostPosted: Tue Jun 26, 2012 5:35 pm    Post subject: Reply with quote

I went with thrusters installed on my 8.2 OO for many years without taking them off... happy camper. Then I took them off one day and never looked back.... much happier camper now. It's a looser feel without the thrusters, it just works better for my style of sailing.
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