fin position to stop spinout

fin position to stop spinout

Post by Gavin de Jon » Tue, 27 Mar 2001 21:55:50


Hi everyone,

I have a question about spinout.  I was in Maui on my windsurfing
vacation just a short while ago and encountered this little problem.  I
was sailing on a 85l wave board with my 5.3 Zone and found that the
board would spinout frequently.  The board would sail great when I
downrigged to my 4.5 Zone.  I realize that the fin was probably a little
too small for the sail but am wondering if you move the fin to the
furthest forward position in it's track will it help reduce this
tendancy? (or if you move it furthest back in it's track?)  I'm just
trying to delay the rerigging down to a smaller sail while I'm having a
blastin' time out there.  My friend and I were discussing it and we had
differing opinions.  I was thinking that if the fin is further back it
has a it has a longer lever arm from the mast base and is not directly
under my back foot.  My friend thought that moving it forward gets it
away from the turbulent flow near the tail of the board making it more
effective.  Which one of us it right?

Thanks in advance.

Gavin

 
 
 

fin position to stop spinout

Post by Mike » Wed, 28 Mar 2001 01:37:13

It seems to vary from board to board, probably depending on board tail
configuration, fin, etc. Try each extreme to see whether it makes any
discernable difference. But if you're spinning out frequently, moving the
fin may not have enough effect to help significantly.

Next steps/other options:
1. A 5.3 can be just too much sail for a lead foot (like mine) and a small
board. I'd think a 5.3 wouldn't bother an 85l board, but sail design and
tuning, board geometry, and rider error (including trying to have too much
fun) can affect that.
2. Is the fin flawless and rock-solid in the box? If not, its performance
range will be severely reduced.
3. Mast track position may make more difference than the fin position. Try
both extremes, then fine tune.
4. Downhaul more and/or tighten the outhaul more to lock the draft (and COE)
further forward to lighten the fin's load.
5. Throw on a slotted fin and fuhgeddaboutspinout. If slots are good enough
for Robby, they're good enough for you and me. The little potential top end
speed loss will go unnoticed on a wave board anyway; its real speed limit is
its rocker.
6. Rent a Gorge Animal Bonzer next time, and raise heck if they don't have
any. I spun out several times per reach at Maui when on anything else,
simply because I was trying to sail everything else like I sail Bonzers, and
they weren't up to the challenge at my borderline-expert skill level.

Mike \m/



Quote:
> Hi everyone,

> I have a question about spinout.  I was in Maui on my windsurfing
> vacation just a short while ago and encountered this little problem.  I
> was sailing on a 85l wave board with my 5.3 Zone and found that the
> board would spinout frequently.  The board would sail great when I
> downrigged to my 4.5 Zone.  I realize that the fin was probably a little
> too small for the sail but am wondering if you move the fin to the
> furthest forward position in it's track will it help reduce this
> tendancy? (or if you move it furthest back in it's track?)  I'm just
> trying to delay the rerigging down to a smaller sail while I'm having a
> blastin' time out there.  My friend and I were discussing it and we had
> differing opinions.  I was thinking that if the fin is further back it
> has a it has a longer lever arm from the mast base and is not directly
> under my back foot.  My friend thought that moving it forward gets it
> away from the turbulent flow near the tail of the board making it more
> effective.  Which one of us it right?

> Thanks in advance.

> Gavin


 
 
 

fin position to stop spinout

Post by Endo » Wed, 28 Mar 2001 13:41:02

Good question! I wish I had a good answer.

I always thought that moving the fin forward would be worse since if
you're feet stay in the same strap position (same lever length) but
the fin moves forward so you can more easily "overpower" the fin if
you're not careful.

But don't take my word for it (I'm just a beginner). Probably a fin
guru like Bill Kline will have a better answer.

Endo

On Mon, 26 Mar 2001 12:55:50 GMT, Gavin de Jong

Quote:

>Hi everyone,

>I have a question about spinout.  I was in Maui on my windsurfing
>vacation just a short while ago and encountered this little problem.  I
>was sailing on a 85l wave board with my 5.3 Zone and found that the
>board would spinout frequently.  The board would sail great when I
>downrigged to my 4.5 Zone.  I realize that the fin was probably a little
>too small for the sail but am wondering if you move the fin to the
>furthest forward position in it's track will it help reduce this
>tendancy? (or if you move it furthest back in it's track?)  I'm just
>trying to delay the rerigging down to a smaller sail while I'm having a
>blastin' time out there.  My friend and I were discussing it and we had
>differing opinions.  I was thinking that if the fin is further back it
>has a it has a longer lever arm from the mast base and is not directly
>under my back foot.  My friend thought that moving it forward gets it
>away from the turbulent flow near the tail of the board making it more
>effective.  Which one of us it right?

>Thanks in advance.

>Gavin


 
 
 

fin position to stop spinout

Post by Bill Kli » Wed, 28 Mar 2001 15:34:28

If you spin out a lot

You have one or all the below problems

1. The fin is bad
2. The fin is too loose in the box
3.  The fin is too small
4. THe fin is bad
5. The fin is bad

Sometimes you can minimize spinout by making absolutely certain that at least
the leading edge of the fin is into the cavity of the rear footstrap, downhaul
your sail more, rid eover the fin a bit more as opposed to against it.
Bill Kline
Gorge Sport USA
Curtis Performance Fins, Orca Fins, Orca Kite Fins
Hood River, OR USA

ph/541 387 2649  fax/541 386 1715

 
 
 

fin position to stop spinout

Post by shin » Fri, 30 Mar 2001 04:01:36

Moving the mast base aft will increase the "down" pressure on the tail --
minimizing spinout.  Probably why you had problems with a big sail and not
with a small one - mast forward vs back..  That is the fix on the water.
The right fin for the right conditions is the future solution.

Shine

Quote:

> Hi everyone,

> I have a question about spinout.  I was in Maui on my windsurfing
> vacation just a short while ago and encountered this little problem.  I
> was sailing on a 85l wave board with my 5.3 Zone and found that the
> board would spinout frequently.  The board would sail great when I
> downrigged to my 4.5 Zone.  I realize that the fin was probably a little
> too small for the sail but am wondering if you move the fin to the
> furthest forward position in it's track will it help reduce this
> tendancy? (or if you move it furthest back in it's track?)  I'm just
> trying to delay the rerigging down to a smaller sail while I'm having a
> blastin' time out there.  My friend and I were discussing it and we had
> differing opinions.  I was thinking that if the fin is further back it
> has a it has a longer lever arm from the mast base and is not directly
> under my back foot.  My friend thought that moving it forward gets it
> away from the turbulent flow near the tail of the board making it more
> effective.  Which one of us it right?

> Thanks in advance.

> Gavin