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Teaching my kids to windsurf question
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U2U2U2



Joined: 06 Jul 2001
Posts: 3056
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Sun Sep 15, 2013 3:04 pm    Post subject: Reply with quote

the installation is fairly easy, using my method.

Not so sure what size fin is best, the largest seemed to much for me, but somewhere in size is a ideal. This a fun and original for me project, with 3 drive and a center fin.

For me it worked better as a single, but never tried it as a tri fin, just four

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outhaul



Joined: 27 Sep 2011
Posts: 180

PostPosted: Sun Sep 15, 2013 9:21 pm    Post subject: Reply with quote

U2U2U2 wrote:
the installation is fairly easy, using my method.


What's your method?
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U2U2U2



Joined: 06 Jul 2001
Posts: 3056
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Mon Sep 16, 2013 10:01 am    Post subject: Reply with quote

this has a ProBox surf box, can accept up to about 15cm fin. Router a hole and remove the gust to the bottom underside, fill with 8lb POUR Foam, re-router to correct depth, a jig from ProBox and router blade works brilliant for depth and the dimensions. Line hole with carbon(best) or fiberglass sheet

insert epoxy, box itself then and fill with epoxy, fin box is held in place with the jig, untill set. Once cured, remove jig and finish the box flush to the deck, I add a layer of fiberglass over the top to tie into the existing deck.

finish by sanding, and paint if desired.

will look for the ProBox instructions ....... go down to the grey line
PROBOX install and tab across

http://www.proboxhawaii.com/pages/installation.html

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http://www.k4fins.com/fins.html
http://4boards.co.uk/
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outhaul



Joined: 27 Sep 2011
Posts: 180

PostPosted: Mon Sep 16, 2013 2:25 pm    Post subject: Reply with quote

U2U2U2 wrote:
this has a ProBox surf box, can accept up to about 15cm fin. Router a hole and remove the gust to the bottom underside, fill with 8lb POUR Foam, re-router to correct depth, a jig from ProBox and router blade works brilliant for depth and the dimensions. Line hole with carbon(best) or fiberglass sheet

insert epoxy, box itself then and fill with epoxy, fin box is held in place with the jig, untill set. Once cured, remove jig and finish the box flush to the deck, I add a layer of fiberglass over the top to tie into the existing deck.

finish by sanding, and paint if desired.

will look for the ProBox instructions ....... go down to the grey line
PROBOX install and tab across

http://www.proboxhawaii.com/pages/installation.html



How did you determine the fore-aft location of the center fin box?
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U2U2U2



Joined: 06 Jul 2001
Posts: 3056
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Mon Sep 16, 2013 2:35 pm    Post subject: Reply with quote

I asked a couple of "experts"
they go to the end of the mast track for the front, I went about 3" more towards the rear

middle or behind the mast track should be a good placement, the nice thing on the ProBox is you can fill the box, if not in use with a blank, thats lightweight

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http://www.k4fins.com/fins.html
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LUCARO



Joined: 07 Dec 1997
Posts: 215

PostPosted: Mon Sep 16, 2013 5:16 pm    Post subject: Reply with quote

Hey U2

Perhaps you can answer a question I have had for a while.

What is the effect of the center fin on "plane"ability? In reasonable non-nuking conditions will boards that are center finned still plane?

Cheers

Roland
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U2U2U2



Joined: 06 Jul 2001
Posts: 3056
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Mon Sep 16, 2013 6:04 pm    Post subject: Reply with quote

sorry don't have the answer. This board did feel like it wanted to go, but I only played with it during obvious lighter winds.

Giving some thought: some of the other board characteristics may be more influential than the center board on planning, provided its a reasonable size.

even more thought: I think it should plan, but really wonder about its reaction when trying to turn........??

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http://www.k4fins.com/fins.html
http://4boards.co.uk/
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LUCARO



Joined: 07 Dec 1997
Posts: 215

PostPosted: Mon Sep 16, 2013 10:36 pm    Post subject: Reply with quote

If you learn more, let me know. I have messed around a little on my kids board with a big center fin and it did not seem close to getting on a plane.

I have wondered if a small fin like what is on your board would have a chance...
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Sailboarder



Joined: 10 Apr 2011
Posts: 412

PostPosted: Tue Sep 17, 2013 6:42 am    Post subject: Reply with quote

The fin is really to give a chance for the kids to stay upwind and to be able to tack in lower winds.

The board dynamics are way different for kids and for adults too. My little girl was so small when she started that she wasn't even able to uphaul while keeping the board crosswing. The board was sitting so high in the water that it offered no lateral resistance, apart from the backfin.

I've seen other kids planing for short moments with the center fin. They looked overfinned though. As an heavy adult, with a larger sail I doubt I could plane with a centerfin. I would need to be way forward of the straps to hold the sail in proper position to prevent the board from going upwind. If possible, the technique would be quite different anyway.
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