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bigblue 4th August 2009 02:49 PM

Weed fin for Isonic 101
Hi Guys
I have a favorite spot here in Sweden where the water is very flat even i high wind, perfect for some Isonic blasting. But at some wind angles it gets so much weed in the water, sailing with out spinning out is almost impossible.

So I need a weed fin to my iSonic 101 which I use with North S-type 7.8 and 6.6. I weigh 75 kilos. I've been looking at the Lessacher Chamäleon but need advice on fin length. Would 28 cm be the right one?

bigblue 6th August 2009 05:18 PM

I have ordered the 28 cm which should be perfect with the 6,6 sail. I will try it on with the bigger sail as well an let you know how it turns ut.

Roger 7th August 2009 01:11 AM

Hi bigblue,
You might be better (faster...shed more weeds) on the iSonic 101 with the Lessacher
Duo vs the Chamäleon.
I have not tried the Chamäleon but I do have a set of Dou weeds (28/32/36/40) and they are really wonderful on the iSonic boards.
28 should be very good with your 6.6 and maybe the 7.8.
Buying a 28 and 32 cm Lessacher Duo's would pretty much cover all conditions you are likely to sail on the iS 101.
Hope this helps,

Lessacher 10th August 2009 02:58 AM

Roger wrote that what I think. Thank you. The weedfins are rake 45°, I worked
for the Speeder rake 30°. Very fast, weed is not perfect,but better than the most
The 22cm made with Thomas Döblin 49,99 knots topspeed. 93 km/h. We dream from
100 km/h. He used the fin the first time. For 101 liter is 28cm,rake30° big enough.

willy 10th August 2009 09:16 AM

Hi guys, I am looking for a smaller fin for my IS 101 2009 for speed other than the stock Drake one, and now i see that there is one called Lesacher, could realy a 28cm fin manage an IS 101 liter with 45.4cm tail wide and with 6.6 or 7.8 sail? Can someone clarify us all that? Isn't such a fin too small?

Roger 10th August 2009 11:07 AM

Hi Willy.
You would need to get a Lessacher Design Duo 28 (or if you don't have weeds, try the 30 deg/ LE Rake Speed Fin).
These are not your normal fins.
They feature Wolfgang's "assymetrical foils".
There is a convex (positive) foil at the top on one side and a concave (negative) foil
on the other side, and then about half way down the foil the covex/conve foils are reversed to the other side. On a weed fin, this means that any weed that lands on the LE of the fin and is symmetrical (balanced on both sides and the kind that really sticks and causes spinout problems) the asymmetrical foil causes them to "flap" on the concave foil and come off easily.
Something about this "asymmetrical foil" system prevents alot of spinout found with purely symmetrical foils.
The guys are really going fast on them, and I will back up Wolfgang's claims on the weed fins as that's been my experience. Try a 9 m2 + formula sail on a 40 CM Lessacher Formula Duo Weed and it will make a believer of you.
The 28 cm is only too small if you "jump on it" too soon, before the water gets going by fast enough.
Otherwise, 28 cm on a slalom board can be very fast, and spinout free.
Only way to really see how good they are is to buy one.
For weeds.... get the 45 deg LE Duo 28.
For Speed.... get the 30 deg. LE speed fin 28
Suffice to say they pretty much do not spin out and they are very fast (check the number of GPS Speedsurfing sailors using them in Holland and elsewhere.
Hope this helps,

steveC 12th August 2009 01:22 AM

I've got a Lessacher Carbon Duo Weed 28s, which is a bit more svelte in outline, as it offers somewhat less area overall. Although I have been using it on a Mike's Lab, the board is of a similar volume, and I'm the same weight as you. I use this fin up to a 7.1 with complete confidence, without any spinout or crabbing, and it jibes so well. It could be that the larger standard Duo Weed 28 would work quite well with a 7.8, as Roger has recommended.

I also have a 24cm Chamaleon that I've used with the 7.1, and while it had excellent drive, free of spinout and crabbing on reaches, it didn't like to be driven hard into jibes and would tend to break loose if suddenly pushed too much. But to be fair, it's a very small fin for such a large sail, and I'm sure that a larger size would most likely solve the problem.

No doubt, whether you go with the Duo Weed or Chamaleon, I think that Lessacher is offering premier weed fins like no one else out there. You're clearly on the right track.

bigblue 12th August 2009 01:54 AM

Thanks Steve. I just got the fin today. Hope to try it out with in the next days. When I tried to fit the fin in the box of my Isonic, it only slid in halfways, and when pulling it out a tiny crack in the gelcoat was the result. Will this let water into the board itself or are there additional layers preventing water from entering the core?

Roger 12th August 2009 11:16 AM

Hi big blue,
Get out your file and some abrasive cloth as well as a bar of soap and "fit" your new fin
into the iSonic finbox.
As far as the tiny crack in the gelcoat, the finbox cassette extends at leas 1/2" in all directions from the actual fin cavity so you should have no worries about anything leaking around the fin box.
The finbox cassette is glassed into the rest of the bottom of the board and is glassed to the deck as well.
A little white touch up paint or nail polish the right shade of white and the area around your fin box will look as good as new.
Hope this helps,

bigblue 12th August 2009 11:54 PM

Phew. OK, at least I know how to spend the evening :-). Thanks for your tip on how to get a perfect fin fit.

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