Can someone please explain to me

eric b 125 · 17th January 2010, 01:21 AM

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

17th January 2010, 02:33 AM

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.

Lessacher · 17th January 2010, 07:51 PM

There should be a difference between big boards and smaller boards.
Upright fins. 15° . Rake 30° fins. and Weedfins with 45°.
125-140liters with 7m²-8,5m² 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
7-8,5m²
Weedfins 45° 28cm is 39cm long

80liters -105liters 27-33cm Slalom or Freeride fin.
6,5-7,5m²
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

17th January 2010, 01:21 AM	#1
eric b 125 Member Join Date: Dec 2009 Posts: 55	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

17th January 2010, 07:51 PM	#3
Lessacher Member Join Date: Sep 2006 Posts: 96	There should be a difference between big boards and smaller boards. Upright fins. 15° . Rake 30° fins. and Weedfins with 45°. 125-140liters with 7m²-8,5m² 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 7-8,5m² Weedfins 45° 28cm is 39cm long 80liters -105liters 27-33cm Slalom or Freeride fin. 6,5-7,5m² 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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17th January 2010, 02:33 AM	#2
Unregistered Guest Posts: n/a	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.