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fin size for 9.0m
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w8n4wind



Joined: 12 Nov 2008
Posts: 270
Location: canada

PostPosted: Mon Apr 08, 2013 8:21 pm    Post subject: fin size for 9.0m Reply with quote

i just picked up an older v8 9m, i had bought it mainly for using on an equipe in kinda subplaning/railing type winds, but have found its working pretty well on my kona 11 5.(aka exocet curve) for blasting around. although i am finding i am feeling a bit under finned with the stock 30cm.
so, as ive never used a sail that size before, what would be an appropriate size fin to get for that sail/board combo ?

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LeeD



Joined: 12 Jun 2008
Posts: 970

PostPosted: Mon Apr 08, 2013 8:50 pm    Post subject: Reply with quote

Fin size is determined not only by length, but by area, square inches, and type of board, sizing, your sizing, your desire to head upwind, your desire to be comfy in 17 mph winds, bottom shape of your board, and direction you need to sail.
If your stock 30 does it all for you, it's just fine.
If you have a standard box, not thru deck, don't go longer than 34, or 12", but you can go much wider, like a longboard surfing fin (those made by Naish for SUP surfing have tons of surface area).
Best to measure the width OFO (one foot off the tail) and try not to exceed it by more than a couple of mm's.
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joethewindsufa



Joined: 10 Oct 2010
Posts: 171
Location: Montréal

PostPosted: Mon Apr 08, 2013 9:02 pm    Post subject: Reply with quote

welcome to my pain Sad

believe these boards both have A/US fin boxes
same as my Fanatic Ultra CAT
my CAT has a decent 30 cm fin, but i am told one cannot go much bigger
with this type of fin box - still used on wave boards today

my fin seems to do fine with a 10-oh sail, but would prefer bigger fin
on my shortboard with power box, i use a 48 cm fin with sails 8.x

i guess as long as we do not push too hard on the fin we are okay
what did they do back in the day ??
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zirtaeb



Joined: 03 Jul 2009
Posts: 2315

PostPosted: Mon Apr 08, 2013 10:15 pm    Post subject: Reply with quote

"back in the day"...
Fins were too small for big fellas.
A daggerboard was added.
Mast track was way forwards, or could be moved way forwards, to increase waterline resistance to sideways drift.
And while they COULD plane, planing wasn't the main consideration.
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kmf



Joined: 02 Apr 2001
Posts: 315

PostPosted: Mon Apr 08, 2013 11:54 pm    Post subject: Reply with quote

If you like the board simply take out the stock "A" box and epoxy in what ever style that you like....Tuttle....Power....whatever.

I did that to a Starboard 103 that I purchased. It cost about the same amount of $ to have Gary at Cascade Sailboards in Mosier put in a power box, (I have a bunch of large PB fins), as it would have to purchase a quality "A" box fin. And when he was done, I could not tell that there had been a repair to the board. A win win.

KMF
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beaglebuddy



Joined: 10 Feb 2012
Posts: 668

PostPosted: Tue Apr 09, 2013 3:35 am    Post subject: Reply with quote

I believe the Kona has a powerbox, the new ones do for sure. My windsup has a powerbox, wish it had a tuttle box, can't believe how easy fins rip out if you just tap something on the bottom.
Incidentally I picked up my cracked in half windsup from the ding guy today, two stringers and $200 but it looks exactly like new. I will post some pictures.
I asked him about putting a tuttle box on another board and he said $120, but things are expensive here in Hawaii, probably cheaper almost anywhere else. So it's probably a $200 job, $120 labor and $70 for a tuttle box wrapped in divinycell if you really want it done right.
Some old guy was sailing around really powered up last summer in very light wind, I was checking out his sail size and he said his secret weapon was his fin, it was a giant black Drake carbon fin, square on the bottom and very wide, like a big hatchet.
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joethewindsufa



Joined: 10 Oct 2010
Posts: 171
Location: Montréal

PostPosted: Tue Apr 09, 2013 4:15 am    Post subject: Reply with quote

on my CAT the OFO/one foot off is about 35 cm
so, how well would a BIG fin run on a board with these dimensions ?
the KONA is probably wider, but probably not the Equipe

and so, i have made NO changes to my CAT - that cost less than the $200 fin box change
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d0uglass



Joined: 28 May 2004
Posts: 1053
Location: Bonita Springs, Florida

PostPosted: Tue Apr 09, 2013 11:34 am    Post subject: Reply with quote

Yeah, it's annoying that the Kona 11'5" came with a US box, since it would be such a great lightwind freeride machine if you could pop a 46 cm fin in it.

Short of doing major surgery on your board to change the fin box, I think your best bet would be a 40 cm pointer fin. That's usually the largest size that they make for US box. (Because any longer than 40 cm would be too likely to tear out the box.) Do a little searching and I reckon you can find one online.

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w8n4wind



Joined: 12 Nov 2008
Posts: 270
Location: canada

PostPosted: Tue Apr 09, 2013 8:23 pm    Post subject: Reply with quote

just quickly looking, it seems like a-box fins over 30cm are pretty rare anymore.
ya, i do wish it had come with a power box, as i have quite a few of those fins, maybe some major surgery will need to be done.. Confused

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zirtaeb



Joined: 03 Jul 2009
Posts: 2315

PostPosted: Tue Apr 09, 2013 8:29 pm    Post subject: Reply with quote

There's a reason that few A box fins are longer than 30cm.
Naish makes a really huge area, slightly swept, old style course racing fin for their SUP line. It's got the most possible area for a 10" fin.
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