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Old 20th April 2009, 06:29 PM   #1
carlosgp5
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Default weed fin

Hi Roger and All,
Sorry for my ignorance, but what´s a weed fin?
Cheers
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Old 21st April 2009, 01:03 AM   #2
Lessacher
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Vertical is 0°. Speedfins between15°-30° (rake) The angle between vertical and
bottum of the board is 90°. The half is 45°,thats the best rake for fins for shallow
water, or weedfins. They have no problem to come over things who swim on the water,
or grow in the water. A Weedfin rake 45° is 32cm vertical deep,but 45cm long
(diagonal.) When you need for 130l and 8m² a fin with 40cm, is the 32cm Weedfin
not so deep. Good for shallow water . Weedfins have a easy handling downwind.
Please look: www.designlessacher.com. Wolfgang
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Old 28th April 2009, 03:48 AM   #3
Crash
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Can confirm a great all round fin the 40cm. I use nothing else now on my Apollo and 160 in all weather, even used it with a 7 meter on the 160 when it was really blowing still in control.
Crash
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Old 28th April 2009, 11:56 AM   #4
Roger
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Hi carlosgp5,
Wolfgang and Crash have given you some good information here.
What makes a weed fin different from the speed fins and vertical
race fins that Wolfgang mentions is the leading edge angle.
Take a look at the Lessacher Design website and his Duo weed fins
in particular
http://www.designlessacher.com/Websi...mula_Weed.html
As you can see the leading edge angle is swept back at 45 degrees or more.
What this does for you as the sailor is it allows any weeds that would catch and
collect on the leading edge of a more vertical (< 45 deg.) to be flushed off the leading
edge but the water flow.
Wolfgang's assymetical foils give the additional weed shedding feature that any weed that lands and sticks on the leading edge won't stay as the foil allows one end of the weed strand to "flap" slightly on the more concave side of the foil and be flushed off.
Additional benefits of a 45 deg. or greater leading edge angle occur if you run into some floating or submerged objects (turtles, fish, logs, trash bags). or if you run into a shallow area .
The angle of the fin will slow your board more slowly and actually tends to "lift" the back of the board.
This is a real safety feature if you sail in shallow areas with changing tides and sandbars.
A slow trip over the front of the board, on a weed fin, vs an hard slam over the front on a vertical fin
will almost always be much easier on the sailor, the rig, and the board.
Hope this helps,

Last edited by Roger; 29th April 2009 at 08:21 AM.
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Old 29th April 2009, 12:19 AM   #5
carlosgp5
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Thanks a lot for your answers... really new knowledge to me...
Cheers
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Old 2nd May 2009, 12:35 PM   #6
Lessacher
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A 32cm Weedfin is ( with rake45°) is 45cm long. Reduce 15% of 45cm and thats the result ,what you can take for a upright fin. Thats between 37-38cm. Thats what I think
over upwind. What do you think Roger? Good windsurfing to you: Wolfgang
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Old 4th May 2009, 04:50 AM   #7
rmz
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Quote:
Originally Posted by Lessacher View Post
Vertical is 0°. Speedfins between15°-30° (rake) The angle between vertical and
bottum of the board is 90°. The half is 45°,thats the best rake for fins for shallow
water, or weedfins. They have no problem to come over things who swim on the water,
or grow in the water. A Weedfin rake 45° is 32cm vertical deep,but 45cm long
(diagonal.) When you need for 130l and 8m² a fin with 40cm, is the 32cm Weedfin
not so deep. Good for shallow water . Weedfins have a easy handling downwind.
Please look: www.designlessacher.com. Wolfgang
Hello!
I have a question to wolfgang
I had a 32cm Lessacher Chamäleon in may hand for my SB go 155 (Drake 52cm) 6.5-8.0 sail but i think maybe 32cm is to short for 8.0 is 36-40cm right size for my kit?

Are Chamäleon the right weedfin for my board?

/Per
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Old 4th May 2009, 08:28 AM   #8
Roger
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Hi rmz,
I'm pretty sure Wolfgang will respond here.
My guess is that you would be better on your 8.0 m2 rig with a 36 cm Duo Cut or Formula Duo.
If you plan to get larger rigs (than 8.0 m2) then perhaps the 40 cm Formula Duo would be better still.
I have the 32 cm Duo, the 36 cm Duo and the 40 cm Formula Duo and use them all the time. They are really my favorite fins for any kind of weed or shallow water conditions.
Hope this helps,
R
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Old 5th May 2009, 11:52 AM   #9
Lessacher
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Thank you Roger! Hallo Per. I think how Roger. 36cm Duo Weedfin is better. She is worked for early planing and wide boards. 100% carbon. Wolfgang
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Old 5th May 2009, 10:04 PM   #10
rmz
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Thank you Roger and Wolfgang!

/Per
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