Sport Today

by **Bill Kli** » Tue, 18 Apr 2000 04:00:00

Hello All,

I had received a note on this problem last week. I responded, supecting there
may be a box problem. It looks like some answers have been posted.

Starboard does use some of our designs on their boards, all are available to
the public. One concern that came up was the paint on some of our fins. Some of
the Starboard Fins are painted yellow. We have had this discontinued because
the mill thickness of the paint was messing up the foils, in some case creating
spinout. the problem can be corrected with some seroius wetsanding.

The Current high aspect CR-15 used on some 2000 boards does have a thin red
strip down the rear. That should not effect the performance as the fins are
sanded smoothly.

T
Gorge Sport USA
Curtis Performance Fins, Orca Fins
Hood River, OR USA

ph/541 387 2649 fax/541 386 1715

by **Ken Nelso** » Wed, 19 Apr 2000 04:00:00

So, is this a problem that the average GO owner (someone like me with limited
high-wind skills) should be concerned about? The yellow is way cool...

Can the paint be stripped chemically as opposed to sanding?

Finally, can you give us any details about the new shallow fin that's available for
the GO?

Thanks

ken

Quote:

> Hello All,

> I had received a note on this problem last week. I responded, supecting there
> may be a box problem. It looks like some answers have been posted.

> Starboard does use some of our designs on their boards, all are available to
> the public. One concern that came up was the paint on some of our fins. Some of
> the Starboard Fins are painted yellow. We have had this discontinued because
> the mill thickness of the paint was messing up the foils, in some case creating
> spinout. the problem can be corrected with some seroius wetsanding.

> The Current high aspect CR-15 used on some 2000 boards does have a thin red
> strip down the rear. That should not effect the performance as the fins are
> sanded smoothly.

> T
> Gorge Sport USA
> Curtis Performance Fins, Orca Fins
> Hood River, OR USA

> ph/541 387 2649 fax/541 386 1715

by **Roger Jacks** » Wed, 19 Apr 2000 04:00:00

Ken :

Quote:

> So, is this a problem that the average GO owner (someone like me with
> limited high-wind skills) should be concerned about? The yellow is way
>cool...

You will not change the color of the fin.
The ideas is to change the finish, and smooth out any ripples
or ridges occuring due to thicker/thinner coating thickness
on the fin. The idea is NOT to take all of the coating off the
fin.
The shiny yellow finish, does not "wet" out well, and this can
help to initiate boundary layer separation which can lead to
spin out.
Spin out can occur at both high and low speeds. It occurs because
the fin is being "loaded" too heavily for the speed you are going.
At low speeds, it feels like the fin just "let's go" but it hooks
back up as soon as you relieve the pressure.
High speed spin out is far more noticeable as when the fin lets
loose, the board turns (which makes the problem even worse) and
you cannot regain your intended direction with out either slowing
down, or pulling the fin back under you to a shallower attack angle.
Then the flow will reattach to the fin and you can resume your
original course.

Quote:

> Can the paint be stripped chemically as opposed to sanding?

I will let Bill answer this for sure, but I'm 99% sure that any
chemical *** capable of removing the paint (polyurethane
I'd guess) would also probably damage the fin materials.

Quote:

> Finally, can you give us any details about the new shallow fin that's
>available for the GO?

I did a test and a brief report on the DC (Drake/Curtis) 33 cm short
span/wide chord fin on a 2000 GO board last weekend.
I sailed it in marginal to early planing conditions(6 knots-8 knots)
with a 9.5 Sailworks Retro. It feels somewhat different than
the larger 54 cm fin, but seemed almost as early to plane, equally fast
overall, with pretty good (not as good as the 54 cm CR, but
significantly better than a weed fin) upwind capability.
Overall, if you sail in shallow water, this fin will make things
safer without a huge performance penalty.
The fin I have is one of the origianl DC 33's and Bill said they
had made some improvements to it as I recall.
If it will handle a 9.5 Retro set at full draft for early planing
and handle it upwind, any smaller sail should be no problem.
later, Roger
--
sailquik US 7011
Sailworks/Starboard/F2/MPB/System B/True
Ames/Chinook/Kokatat/Da Kine

Sent via Deja.com http://SportToday.org/
Before you buy.

by **Ken Nelso** » Wed, 19 Apr 2000 04:00:00

Thanks, Roger!

Quote:

> Ken :
> > So, is this a problem that the average GO owner (someone like me with
> > limited high-wind skills) should be concerned about? The yellow is way
> >cool...
> You will not change the color of the fin.
> The ideas is to change the finish, and smooth out any ripples
> or ridges occuring due to thicker/thinner coating thickness
> on the fin. The idea is NOT to take all of the coating off the
> fin.
> The shiny yellow finish, does not "wet" out well, and this can
> help to initiate boundary layer separation which can lead to
> spin out.
> Spin out can occur at both high and low speeds. It occurs because
> the fin is being "loaded" too heavily for the speed you are going.
> At low speeds, it feels like the fin just "let's go" but it hooks
> back up as soon as you relieve the pressure.
> High speed spin out is far more noticeable as when the fin lets
> loose, the board turns (which makes the problem even worse) and
> you cannot regain your intended direction with out either slowing
> down, or pulling the fin back under you to a shallower attack angle.
> Then the flow will reattach to the fin and you can resume your
> original course.

> > Can the paint be stripped chemically as opposed to sanding?
> I will let Bill answer this for sure, but I'm 99% sure that any
> chemical *** capable of removing the paint (polyurethane
> I'd guess) would also probably damage the fin materials.

> > Finally, can you give us any details about the new shallow fin that's
> >available for the GO?
> I did a test and a brief report on the DC (Drake/Curtis) 33 cm short
> span/wide chord fin on a 2000 GO board last weekend.
> I sailed it in marginal to early planing conditions(6 knots-8 knots)
> with a 9.5 Sailworks Retro. It feels somewhat different than
> the larger 54 cm fin, but seemed almost as early to plane, equally fast
> overall, with pretty good (not as good as the 54 cm CR, but
> significantly better than a weed fin) upwind capability.
> Overall, if you sail in shallow water, this fin will make things
> safer without a huge performance penalty.
> The fin I have is one of the origianl DC 33's and Bill said they
> had made some improvements to it as I recall.
> If it will handle a 9.5 Retro set at full draft for early planing
> and handle it upwind, any smaller sail should be no problem.
> later, Roger
> --
> sailquik US 7011
> Sailworks/Starboard/F2/MPB/System B/True
> Ames/Chinook/Kokatat/Da Kine

> Sent via Deja.com http://SportToday.org/
> Before you buy.

by **Bill Kli** » Tue, 25 Apr 2000 04:00:00

Hello.

Yellow is way cool., buy the real problem is that too many fins are designed
like T-shirts... to look cool.

Paint on fins is basically not very smart, Tale a look at fins with paint
stripes. Run your fingernail across the fin, you will often feel the paint
line..NOT GOOD!

A fin the water loves will always perform best. The water does not like paint
lines or the application of paint after molding. If paint is used, that mill
thickness effects fin performance if it is not considered in design.

As the previous comment suggested, the key is to break surface tension by
wetsanding. A scotchbrite 3m pad works great also.

The Drake Curtis 33 (Go Fin) is now available. Check www.gsport.com for
further information. This fin works well on conventional and wide boards, is
available in Tuttle, Power and Trimm box configurations.

Gorge Sport USA
Curtis Performance Fins, Orca Fins
Hood River, OR USA

ph/541 387 2649 fax/541 386 1715

Sport Today

Fin fit on GO, from Gorge Sport USA (Curtis Fins)

Fin fit on GO, from Gorge Sport USA (Curtis Fins)

Fin fit on GO, from Gorge Sport USA (Curtis Fins)

Fin fit on GO, from Gorge Sport USA (Curtis Fins)

Fin fit on GO, from Gorge Sport USA (Curtis Fins)

Fin fit on GO, from Gorge Sport USA (Curtis Fins)