Old 17th January 2010, 01:21 AM   #1
eric b 125
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Default Can someone please explain to me

the relationship b/w sail size, wind speed, and fin size? I'm trying to learn about fins and their function (aside from the obvious lateral movement of the board) like tail lift and drag. I know there's a lot of information as far as this goes, i'm just looking for the basics. thank you so much for your help!

Eric
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Old 17th January 2010, 02:33 AM   #2
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As a guide the relationship between Sail and fin size is


Times 5 add 3 !!!!

So for a 7 metre sail;;;; x 5 gives 35cm Adding 3 gives 38cm

7 metre sail (starting point) fin 38cm..
Works pretty much all disciplines !!! AS A GUIDE !!!!


Faster you go ; smaller the fin needed.. If you are going like stink on 7 metre on nice flat water you would get away with much smaller fin than marginal powered 7 metre >>

If you experience control probs;board trying to lift windward rail try smaller fin. If your mates are going upwind better than you ;try a bigger fin !!!

Experiment til you feel comfortable.
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Old 17th January 2010, 07:51 PM   #3
Lessacher
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There should be a difference between big boards and smaller boards.
Upright fins. 15° . Rake 30° fins. and Weedfins with 45°.
125-140liters with 7m˛-8,5m˛ 36-38cm Slalom or Freeride fin.
Rake 30° 32cm is 39cm long -
Weedfin 45° 32cm is 45cm long.

105liters-125liters Slalom 30cm-33cmRake or Freeride fin.
Rake30° 28cm is 35cm long
7-8,5m˛
Weedfins 45° 28cm is 39cm long

80liters -105liters 27-33cm Slalom or Freeride fin.
6,5-7,5m˛
Rake 30° 25cm is 28cm long
Weedfin 45° 24cm is 34cm long.
There I work doubleasymm.fins can I use the fins 2-3cm shorter. Carbon or G10?
Carbon shorter than G10. So you can see,many points.
At first: No spin out and fast. A Rake 30° fin in 22cm made with Thomas Döblin
50 knots topspeed GPS. Wolfgang

Last edited by Lessacher; 17th January 2010 at 07:56 PM.
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