THURSDAY, SEPTEMBER 17, 2015 8:31:54 PM
DENMARK, flag Jesper Schmidt
Jesper Schmidt

Daggerboard falling half down planning in choppy conditions

Hi I have now experienced on my 2. board, which is only 12 month old that Daggerboard goes half way Down in choppy planning conditions . The 2 silicone Gaskets under the board suddenly  cant hold  the pressure from the daggerboard.

It happend many times for me under the Worlds in Holland, and i ended up having to rent another board. By asking other sailers I know this is a general issue with the construction , and it is very unpleasant when you go full speed downwind and suddenly the Board turns up into the Wind... On my last board i ended up changing the gasket, but that is a lot of Work. Anyone knows how to fix this problem..  It do not looks like There is a sollution from the supplier just around the corner :-)


TUESDAY, SEPTEMBER 22, 2015 6:30:38 PM Reply: #1 
USA, flag Dan Weiss
Dan Weiss

Hi Jesper, I understand this was an issue for you and a few others at the Worlds.  

Without modification or installation of any foam shims, most of the centerboard cassettes (the white, plastic plates that screw down into the deck) that hold the centerboard have oval screw holes.  If yours does, then try to unscrew the four screws a bit and push the plates closer together.  This should increase the pressure on the centerboard and help it stay up.  

I understand the problem may start with the plate design itself. There is a slot running above that hole into which the centerboard pivot plug which forms the axis of rotation.  That slot seems to cause flexibility and/or may allow the pivot plug to become loose.  I also understand changes to the manufactured cassette may be made.

As an alternative, perhaps you might glue a ring of thin, EVA foam around the hole in each side of the cassette, between the cassette and the centerboard.  This might increase the friction enough.

I hope this helps.  Please let me know what steps you took and any success or results.  You can email me directly @ dwus484@comcast.net and/also post directly to the forum to help others.  I'll reach out to Joachim to see what changes he might have found successful, and to push this forward on the manufacturing side.

Great job at the worlds, too!  

-Dan


TUESDAY, SEPTEMBER 22, 2015 7:38:50 PM Reply: #2 
DENMARK, flag Jesper Schmidt
Jesper Schmidt

Hi Dan , thanks for your reply.

 

Yes it is a problem in high Wind and choppy condition only, and unfortunately this is also where you least wants to experience this issue.. :-(.. Last year on my old board I changed the silicone gasket, and that worked for some time.. The problem is when the board is slammin up and Down in the waves.. I will proberbly buy a new board Again, but it is a lottery whether you get a board were this issue occurs or not and difficult to get a new board on warranty for this issue. I would say aprox 25% of the people I talked to have experienced the problem, so I really think the supplier shoud find root course and sollution for this

s issue..Thanks for your constructive ideas.  Again maybe I expect to much ,if i expect the supplier to find a sollution...


TUESDAY, SEPTEMBER 22, 2015 10:31:36 PM Reply: #3 
USA, flag Dan Weiss
Dan Weiss

Bouncing the centerboard might be solved in part by gluing foam underneath the aft end of the centerboard well, directly under the deck. Most boards already include a foam block, but hours of pounding certainly will compress the block and impair the block's ability to dampen the bounce back down.  Just a thought.


THURSDAY, SEPTEMBER 24, 2015 5:03:59 PM Reply: #4 
DENMARK, flag Jesper Schmidt
Jesper Schmidt

Hi Dan can you explain the sollution with a foam block.

Should it be glued at the back end of the centerboard ?

I was thinking about putting an elastic between the mast base and the handle on the daggerboard, but unfortunately the elastic is in the way when you stand on the board.

 


WEDNESDAY, SEPTEMBER 30, 2015 2:10:30 PM Reply: #5 
USA, flag Dan Weiss
Dan Weiss

Im not entirely certain the best place for the foam block, but you might see one attached to the underside of the deck.  If not, I suggest simply trying different locations that make the most sense.

This is NOT strictly class legal for racing, but represents a simple thing that might help temporarily until you can fit a replacement centerboard well.


SUNDAY, OCTOBER 4, 2015 2:48:59 PM Reply: #6 
DENMARK, flag Jesper Schmidt
Jesper Schmidt

Honestly I do not care whether it is class legal.. If the supplier can not provide a sollution then I have no problem surfing with a homemmade sollution, and honestly nobody would protest if there is no advantage for the surfer..  But it is an issue when you charter boards.

 

 


TUESDAY, OCTOBER 6, 2015 6:25:54 AM Reply: #7 
USA, flag Dan Weiss
Dan Weiss

I understand how you feel. I've already communicated with the manufacturer about this. There are several solutions at the factory level. I'll stay on top of the issue as far as the Kona Windsurfing Association is concerned and as a Kona sailor myself. 


MONDAY, FEBRUARY 15, 2016 10:32:09 AM Reply: #8 
AUSTRALIA, flag KennyK
Male icon

I Have the same problem.
My board is only about 6 months old at a guess.


MONDAY, FEBRUARY 15, 2016 10:32:10 AM Reply: #9 
AUSTRALIA, flag KennyK
Male icon

I Have the same problem.
My board is only about 6 months old at a guess.


FRIDAY, FEBRUARY 26, 2016 6:10:43 PM Reply: #10 
DENMARK, flag Jesper Schmidt
Jesper Schmidt

Hi Kenny it is a general problem with the Construction. It is 2.board , and I have had 2 boards where I have the problem..You can change the gaskets , I did that on my first board, but it is very time consuming since you have to remove all old glue first, and no garanty it will Work...  It is really annoying since it only happening in extreme conditions , when you go full power in strong Wind and the board hits the waves continuesly..Unfortuntely when it then happens the board turns up in the Wind immidietly and you loose the planning and in competitioon a lot of surefers  will pass you...I am thinking about buing a new board Again, but since there is no guarantys it will Work on new board it is a lottery..


MONDAY, APRIL 4, 2016 8:13:29 PM Reply: #11 
USA, flag Dan Weiss
Dan Weiss

Hi KennyK,  Do you plan to race in one-design Kona One events predominantly?  Is your new Kona one that you anticipate racing in European or World Championships?  

Please read the thread completely if you've not done so.  Easy and inexpensive modification can be made easily with the understanding that those changes are not class legal.  

My efforts to find a better solution on the manufacturing side might be more efficiently made on the class rules side.


MONDAY, APRIL 4, 2016 8:19:03 PM Reply: #12 
USA, flag Dan Weiss
Dan Weiss

KennyK, one more thing.  You can adjust the tension of the centerboard well by moving the two plates more tightly together.  Simply loosen the four screws, press the plates together and screw tight again in the new position.  Of course, this will increase the amount of effort necessary to move the centerboard, but you can spray dry lubricant (like Sailquik McLube) onto the board when extended.  Moving the board up and down will cause the coating to rub off onto the gasket.

I didn't mention this to Jesper as I know he is aware of this adjustment.


WEDNESDAY, APRIL 20, 2016 9:49:28 PM Reply: #13 
DENMARK, flag Jesper Schmidt
Jesper Schmidt

Hi Dan I have tried also with pressing the plates together but honestly it really do not work.  I have also tried to put tape behind the gaskets etc..To the worlds in Holland I had to rent a board in the end...Kenny the only way to solve it is buing new gaskets, it is a Hell of a job to change due to they are glued and you have to remove old glue. And I can not guaranty it would work, and for how long time..I did it on my first board and it worked for approx 4 month..If you buy a new board it is difficult to test before you are out there in waves and hard wind....I really hope supplier will come up with a solution on this issue with construction..