What is the general rule with regards to the size of a weed fin compard to the size of a Normal fin. I have tried searching this but have come up with conflicting answers.

I have a 31cm Fin and want to get the equivalant weed fin. what size do I need?
Is about 26cm (depth) about correct.

Cheers

May depend on sail size and type of board/use.

Attached is a link to Wolfgang Lessacher's site.

I have a couple of his fins and intend to get a couple more. My JP weedfin still collected floating seagrass on the leading edge and was prone to cavitation when pushing upwind, whereas these don't on either count. They rarely cavitate and are easy to correct if this happens.

http://www.designlessacher.com/Website/Weedfins_Laenge.html
www.designlessacher.com/Website/Uk_Duo_Cut_Weed.html
www.designlessacher.com/Website/Uk_Duo_Cut_Wave_Weed.html

my $0.02

I hate the way Europeans seem to use commas when it should really be a decimal point. As in "1,414 times longer"

That's a long fin.

I remember reading an article in Boards a while back where they blind tested the same boards with different styles and size of fin.

No surprise that everyone really notice the size difference - even a couple od cms seemed to feel very different. What was a surprise was that no one could pick different styles of fins in the same size - even freestyle fins. Just didn't seem to make a noticable difference to upwind performance or early planing.

Don't remember whether they specifically tested a weed fin, but it's food for thought!

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leftfield said...

What is the general rule with regards to the size of a weed fin compard to the size of a Normal fin. I have tried searching this but have come up with conflicting answers.

I have a 31cm Fin and want to get the equivalant weed fin. what size do I need?
Is about 26cm (depth) about correct.

Cheers

ummm i think this would be about right if the weedy is swept at aprox 45deg?
mandurah crew?

I thought the depth had to be about the same for each.
But it is complicated, there's weedys and weedys.

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decrepit said...

I thought the depth had to be about the same for each.
But it is complicated, there's weedys and weedys.

At least it's not just me who is confused by this.
Cheers for everyones help

But who out there uses a weed fin?? What size (depth) is it. and what size board/ sail do you use it with. And is the performance for general messing about OK.

I have a 50 x 245 small slalom (65L) that I am using with a select evo 35 turned in to a 24 weedy (thanks to Elmo) This works for a 5 or 5.8 koncept. I have also used it with a JPslalom III 54 x 235 (84L) but my preferred fin on this board is a JP slalom 42 made in to a 29 weedy (Elmo).
I also have a JP FSW (91L) that I use a 26 Flying objects weedy in (this is a much slimmer fin) it is ok on the ocean with a 5 combat wave and sort of works on my 5.4. I have used it speed sailing with as big as a 6.6 koncept but horrible spin out (despite good speed)

What type of sailing are you doing as there are now weed wave fins available but these are different to speed fins.

Tell us your weight / board / sail / location combo and we can give some more advice.

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lao shi said...



What type of sailing are you doing as there are now weed wave fins available but these are different to speed fins.

Tell us your weight / board / sail / location combo and we can give some more advice.

Cheers for the info.

Hoping to get out in the ocean at Safety bay for the first time using the below combo but want to get a weed fin that works.
Weight: 90kg
Board: JP FSW 109
Fin 31cm
Sail: 5.7m

The JP freeride weedies are well regarded a 31 should see you right for general freeride. If your 5.7 is a wave sail and you want something more turny for waves then maybe the weed wave. Some suggestions on the JP site here http://www.jp-australia.com/2010/index.php?id=411

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lao shi said...

The JP freeride weedies are well regarded a 31 should see you right for general freeride. If your 5.7 is a wave sail and you want something more turny for waves then maybe the weed wave. Some suggestions on the JP site here http://www.jp-australia.com/2010/index.php?id=411

I'm an idiot I didn't see the fin info on the JP site.

Cheers

You need a weeder with more surface area but less span than an upright in general. However,after sailing weeders extensively, I have found that with the biggest sails i.e. 9.6 and 11 you needn't increase the weeder size when rigging up in sail size. I use a 48 cm Hydrotech with both of those sizes and an 8.0. The 8.0 does spin out in chop. Don't base your decisions on the Lessacher fins, either. I am still testing the use of one I purchased last summer. Soon I'll be trying it with a Formula board and the 8.0 V-8. Lessacher recommended a 36 cm fin for sails up to 10. However with my 9.6 I found that although it doesn't spin out, the Lessacher is very slow getting up on a plane when the winds are fluky. In a steady wind, they're great, fast and smooth. However, the board crabs sometimes, again in marginal conditions. The wider hydrotech works better for me in gusty conditions as it planes through the lulls better. If you are using the more upright someweed types of fins, sizing can be different, too.

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TristanF said...

I remember reading an article in Boards a while back where they blind tested the same boards with different styles and size of fin.

No surprise that everyone really notice the size difference - even a couple od cms seemed to feel very different. What was a surprise was that no one could pick different styles of fins in the same size - even freestyle fins. Just didn't seem to make a noticable difference to upwind performance or early planing.

Don't remember whether they specifically tested a weed fin, but it's food for thought!

That article didn't address weeders an isn't pertinent. There is a substantial difference between weeders and other fins. You can plane up much sooner with a weeder than almost every other fin, but your top end speed is diminished noticeably. Your upwind ability is also compromised with a weeder. They can turn almost as well as a swept backed fin, but many designs spin out.

Scratchynuts (Rubby) Howzitgoingthere

www.iwindsurf.com/forums/viewtopic.php?t=19328

Scratchynuts (Rubby) Howzitgoingthere

www.iwindsurf.com/forums/viewtopic.php?t=19328

I can't believe he is such a pest that there was a whole cartoon series about him in the USA, that Mo bloke from one of the WS forums created it I think

Rubbynuts would be a good name for when he changes it again

hey, scrachtyanuts (ruby) you are wanted man. there looking for you if i was you dude i would not post. there are alot of angry windsurfers after you. i think the mob is after ya. Is it true ruby you have cause 1000s of people to not take up windsurfing? they said in iwindsurf you plant worms in all the windsurf forums on the net why my friend?

please come forward and show ya self, be a man