Fin Position

Fin Position

Post by Matthew E. Trynis » Thu, 19 May 1994 07:54:36


Hi Folks,
   Here's an "easy" question: how do I decide where to position the
fin on my Samba? There's lots of room to move it fore/aft

Thanks in advance,
Jim Virgo

 
 
 

Fin Position

Post by Jaime Corde » Fri, 20 May 1994 07:39:36



Quote:
>Hi Folks,
>   Here's an "easy" question: how do I decide where to position the
>fin on my Samba? There's lots of room to move it fore/aft

>Thanks in advance,
>Jim Virgo

1) If you're not planing, it's less critical. Forward makes it
   turn easier, backward makes it track better. If you're using
   your daggerboard, then the effect is even more muted.

2) If you're planing, then try to align the leading edge of the
   fin with the back***of the back strap (assumes you are
   in the footstraps, assumes you have a fin whose leading edge
   goes straight down). Again, more forward makes it turn easier,
   more backward makes it easier to go in a straight line, but
   the adjustments are quite small: an inch is a large adjustment.

   If you have a swept back or curved fin, try to approximate
   what would be the leading edge.

   From the initial position, experiment a little forward and back.
   Best placement depends on how much of the board is out of the
   water, sailing style(speed vs manuever) etc.

Good luck,

Jaime
--
--------------------------------------------------------------------------------
Jaime Cordera

<.signature under construction>

 
 
 

Fin Position

Post by Wayne Berthiau » Fri, 20 May 1994 21:22:53


Quote:
(Matthew E. Tryniski) writes:
> Hi Folks,
>    Here's an "easy" question: how do I decide where to position the
> fin on my Samba? There's lots of room to move it fore/aft

> Thanks in advance,
> Jim Virgo

        Windsurfing magazine once had an article on fin placement. Basically, it
recommended that the leading edge of the fin be located as close to the
rear foot
as possible. However, sail position should have an effect on this as the fin
should counter the center of effort in the sail. Damn! It can get rather
complicated....

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"One man can make a difference and every man should try." -unknown
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Fin Position

Post by jeremy polla » Sun, 22 May 1994 02:52:46


Quote:


> (Matthew E. Tryniski) writes:
> >    Here's an "easy" question: how do I decide where to position the
> > fin on my Samba? There's lots of room to move it fore/aft
>    Windsurfing magazine once had an article on fin placement. Basically,
> it recommended that the leading edge of the fin be located as close to
> the rear foot as possible. However, sail position should have an effect
> on this as the fin should counter the center of effort in the sail.
> Damn! It can get rather complicated....

jim (& hi wayne!)

first, i suggest you fix your email address (direct response bounces).

second: after this gets 'discussed' among those who choose to post, maybe
someone (jim?0 will assemble a composite answer for one of the faqs that
are currently being solicited?

third: my $.02:
forward, for better upwind performance... aft, for better maneuvering.
(look at skegs in gorge videos; there, as river current 'automatically'
brings one upwind, for better control, skegs generally set aft.)  imho,
all the way forward also seems to improve leading edge water flow in old
style (slot) boxes, and so may offer more resistance to spin-outs.  some
suggest setting leading edge of fin even with rear footstrap too; that is
certainly a good (best?) place to start.

jeremy