tri fin speed board

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Created by

keef > 9 months ago, 20 Jan 2010

icesurf

QLD

113 posts

22 Jan 2010 11:30am

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sailquik said...

But believe me, when it is really windy and you are 130 off the wind it is usually pretty big following chop on the fast part of the course and it hammers like hell. I have been on the bank watching guys go past with their fins more than half out of the water as they go over the troughs!

And, amazingly, very few spinouts happen even in these conditions with top quality speed fins.

Today I used my 43cm speed board, 5.7m KA sail, 20 KA assy fin.
The course was super rough with incoming tide & wind being super broad.

With a wind gust of 25-30 knots I approach the course through heavy chop, board & sail felt great with heaps of control as I started to bare away picked up speed, the Fin started to move sideways before total spin out, tried to recover to no avail....splash and missed the gust of the day.

As you guys have lots of experience the KA speed fins is there limit to how broad you can go?

Michael

oldee

VIC

14 posts

22 Jan 2010 1:29pm

Just a word to Wolfgang here.
Hope that you have a signed contract with Select for manufacture of your fins.
Your work should put you in the Hall of Fame with Jim Drake, not with your fins ripped off you.
Who would have thought that a speed fin and a weed fin could be the same?

I am thinking of the Swiss Swoard extreme snowboard which had a manufacture difficulty.
It is now finally made Nidecker and costs much less.

Lessacher

89 posts

22 Jan 2010 3:23pm

Jim Drake is for me one of the biggest piece of my life. In August 40 years only fun on the water. I am only a little piece from him, for me is it only fun.I am 68
years old or young.To work with factories,thats not my idea, you give your good
name. I try to find things over fins and the way is good. Wolfgang

keef

NSW

2016 posts

25 Jan 2010 11:03am

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Lessacher said...

I worked in 39 years 155boards for Windsurfing. Only for myself. Only some boards
for Lechner. The last years make I only in front broken boards shorter. 2m long
no problem. I tried from one to five fins all it. I am a friend from concaves at the
bottum. The last years no time for boards, only fins.
What should a fin can do? Speed and no spin out. So I worked only asymm.fins
so how they do it in Sandy Point. Only for one way. Leewards flat. That was okay
later leewards a concave from the thickest point of profile to the end,2mm deep.
That was faster and no spin out. So there were 2fins. A right and a left.
There I are windsurfing in Netherland Srand Host, was it it always the same. In
front fast and back slowlier. Over 4km 20m in front, the first.
So I said , 10m in front, thats the half, but i am the first. So I worked the
concaves diagonal. A concave left and one right do not work. Diagonal works it good. The half concave for in front works leeward, the other works on the way back. 40cm fin, 20cm concave from the base to the middle, on the other side
from the middle to the tip. What happend? The concave for the way back
reduce the vacuum on the other side so good, that there was no difference.
Not 10m in front, 20m. Thats all. Cut out at the base? Helps to start very big
sails, witout to get spin out. Thats only for the first meters where you have not enough speed. Select asked me for Prototypes, they got some, they said to thick,
I said no, but now they work the Weedfins with cut out. They are the first who
wake up. Wolfgang

wolfgang those fins look awsome was that a team effort or are they your own design, i reshaped an old wave slot fins down too 21cm, i took measurements off my venom26 but made the foil thicker it 's amazing how quick the fin recovers, the best speed so far is 31.5 and never span out, not saying it didnt try too, but it does have a slight hum at the 30 mark maybe a slight concave mite sort it out

sailquik

VIC

6166 posts

25 Jan 2010 11:19am

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icesurf said...

And, amazingly, very few spinouts happen even in these conditions with top quality speed fins.

Absolutely not. The broader the better as long as you have the speed.

I have only ever experience a similar thing when I have backed off to try to slow down at top speed in the real rough at the end of the course (very broad I guess). While on the gas I have never felt anything like this.

Were you up to 35+ at the time?

icesurf

QLD

113 posts

25 Jan 2010 12:57pm

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sailquik said...

icesurf said...

And, amazingly, very few spinouts happen even in these conditions with top quality speed fins.

Hi Andrew,
Thanks for the info.

As the course was quite rough entered on a reach at 30 knots,
then started to broad reach, went to 32.7 knots before letting go.
Acceleration was too slow for the wind strength.

Spoke to AMAC & quite sure we know the cause.
A while back the Fin hit the sand bar and there was few nasty knicks in the tip area. The knicks where not a problem, just didn't look nice.
So other day I filled the knicks with epoxy & sanded back the the bottom part of the Fin, I didn't bring the Fin back to its original finish.
So Now I'm applying another clear coat & repolishing.

Lessacher

89 posts

25 Jan 2010 5:38pm

Hallo Kleef! I designed and worked all it alone, at first prototypes in G 10 and
than the moulds for the carbon fins. Carbon fins only in 100% carbon and for
high speed sometimes a little ceramic in. All it is worked by hand, no computer
or big machines. 3 factories can work my fins. I get some Euro licence.
I work sometimes out such G10 fins new prototypes. My Duo Weedfins work I
in 24 28 32 cm , The 40cm worked I 2-3cm wider. On Saturday saw I in
Düsseldorf the weedfins from Select, ecactly my outline and cut out, not in G10.
They are in glass, black and polyester? Made in India. May be that I buy a 40cm
work concaves in and than I have a new Prototype for my 40cm Duo Wedfin.
I buy my own Wave Weedfins from one of the 3 factories, work Twinserfins for
Weed between 12-16cm. In winter they buy no fins, so have I to wait. Or I work
they in carbon. Wolfgang

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