Go Back   Starboard Forums > Free Forum

Thread Tools Display Modes
Old 17th January 2010, 01:21 AM   #1
eric b 125
Join Date: Dec 2009
Posts: 55
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 b 125 is offline   Reply With Quote
Old 17th January 2010, 02:33 AM   #2
Posts: n/a
Red face

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.
  Reply With Quote
Old 17th January 2010, 07:51 PM   #3
Join Date: Sep 2006
Posts: 97

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
Weedfins 45° 28cm is 39cm long

80liters -105liters 27-33cm Slalom or Freeride fin.
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.
Lessacher is offline   Reply With Quote



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
The Atom, please explain Unregistered Free Forum 1 29th August 2009 04:37 AM

All times are GMT +7. The time now is 01:48 PM.