Moving centre fin forward to make board loose

> 10 years ago
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wheels
wheels
WA
204 posts
WA, 204 posts
12 Jun 2013 8:29pm
Just wondering if it is always the case that if you move the centre fin forward it will make any board looser, as it seemed to do the opposite on a mates boards the other day.
Is it better to get a smaller fin rather than moving the fin all the way forward?
Anyone want to share what difference the fin position has made on their boards.
Thanks
DavidJohn
DavidJohn
VIC
17570 posts
VIC, 17570 posts
12 Jun 2013 10:45pm
I've never known a board that when you move the fin forward it makes the board stiffer.. What type of board does your mate have?

btw a smaller fin should also make the board looser but you might also get more yawing and a decrease in stability.

DJ
Leroy13
Leroy13
VIC
1174 posts
VIC, 1174 posts
13 Jun 2013 12:22am
Sorry to spoil the debate but basic physics decrees that if you move the same fin further up the centre box then it will become looser. Any one that tells you any different must be a graduate of Hogwarts school of Magic as the only way it will stiffen it up is with the Cruciatous curse.(I did hear a rumour that Volcom is possibly a muggle venture by Voldemort???) THe only possible explanation is that the resultant looseness made your mate alter his stance, definitely possible on a shorter style SUP. The best way to answer your question about smaller fins is to try and borrow one off someone and try. Fin technology is a very personal and suprisingly complicated art. There are people like Teatree, Lacey and Wazza to mention a few in QLD that are geniuses at different combinations and their capabilities. In WA it would be worth talking to Hilly, Greenroom and Sameh again just to name few. Good luck with it all!!!!!!
colas
colas
5379 posts
5379 posts
15 Jun 2013 12:20am
Actually, what could happen is that the board could become "too" loose. On fast waves, with a fin very far forward, your board may start turning faster than expected while your body hasn't leant enough into the turn, making you "straigthen out", kind of "understeer". This is often called "squirelling".

In other words, fin forward => always looser. but you need to have the technique to handle the looseness at speed. But I don't know if this was your experience.
waxer
waxer
SA
247 posts
SA, 247 posts
15 Jun 2013 10:49am
Does his fin set up look like this?

cel23
cel23
QLD
175 posts
QLD, 175 posts
15 Jun 2013 1:56pm
leroy is spot on!
glennc
glennc
NSW
144 posts
NSW, 144 posts
15 Jun 2013 7:36pm
I,v seen some boards with really long central fin boxes.
If your back fin is pushed to far forward and come into alignment with your thruster fins this could have a stiffening effect.
CMC
CMC
QLD
3954 posts
CMC CMC
QLD, 3954 posts
15 Jun 2013 8:30pm
Whether a fin forward or back makes it looser or stiffer depends if it is set up as a single fin or tri fin set up.

On a tri fin moving it forwards brings it more into line with the side fins meaning it is easier to pivot. Back spreads the cluster and creates more drive.

I'm not that convinced on a single fin moving it forward makes it looser as it can change the way the rail reacts with the fin and changes the sweet spot to turn. That's my opinion and experience anyway.
cripple
cripple
WA
21 posts
WA, 21 posts
17 Jun 2013 3:00pm
cel23 said..

leroy is spot on!


cel23 said..

leroy is spot on!


The fins are bad but check out the VPL
cripple
cripple
WA
21 posts
WA, 21 posts
17 Jun 2013 3:01pm
waxer said..

Does his fin set up look like this?



Sorry wrong thread, try again

The fins are bad but check out the VPL
Leroy13
Leroy13
VIC
1174 posts
VIC, 1174 posts
17 Jun 2013 5:10pm
cripple said..


waxer said..

Does his fin set up look like this?



Sorry wrong thread, try again

The fins are bad but check out the VPL


Ha, I think I've spotted the problem ---- continuous LOLLING

I actually had them inside out once without noticing, surely that just a setup??? Thanks Matt 18 for spotting it!
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