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[soulvoid]

Anyone doing them? I kind of like singlefins (or atleast being able to set it up as a single fin, 2+1, etc.) however I'm worried about it killing all the flex in the tail, even if I don't attach it through to the deck. Also I'm worried about the point load in front of the box.

Any thought? Anyone done two boards of similar shape with and without a FU box, is so could you tell the difference?

[Jarrod]

Well, I can't show you the destination, but I can show you the path.   Besides, the fun is in the figuring out.


In order to keep the flex in the tail, you don't want to tie the deck and bottom skins together.   You also have to mount the box so it has enough strength to resist the heavy forces that are put on a singlefin.  There are lots of different solutions to this issue, none of them wrong, all right to some degree. 

For the record, I have tied the bottom and deck together with boxes, and it does affect the flex considerably.

[soulvoid]

For the record, I have tied the bottom and deck together with boxes, and it does affect the flex considerably.

I'd try to avoid that anyway. Thinking high density foam around the boxes plus a plate or something embedded in the core for the box to be connected to instead of the deck. Time will tell...

[dougirwin13]

There's always spackle 

You know my sig on Sways?  Well I did find a use - when you WANT something to delam

You don't want the box to bond to the deck?  A nice liberal coat of spackle seems to do the trick nicely!

[surfer_dave]

Doug, are you kidding or did you really smear spackle in your finbox cavity?

If you did, you are creating a moving part right?

[paul cannon]

doug are you sure you know what spackel is
it is not pollyfilla if that what you are thinking
i though it was the wall fillers that are commonly available
but its not
spackle is a titanium white superlightweight filler
when you pick up a 1 liter container it feels empty
you can paint it almost within an hour
and its goes on smooth as butter
it absords the epoxy somewhat
and will not delam as you think

[dougirwin13]

I know that polyfiller isn't spackle

According to my mates at Bunnings true "spackle" isn't available in Aus.

However, they say that Bostik "kwikset lightweight filler" is the same stuff.  It's titanium white (I swear it glows white in the dark) and the container feels nearly empty.  They may be wrong but I have a feeling they know what they are on about.

And no, I didn't coat my entire finbox in it

If you have something bonded to the bottom and you find, after shaping the core, that it's going to fit snug against the deck you think "Eeek! I dont want the deck and bottom tied togethor!".  That's the situation where I coated the bit that was going to contact the deck with "spackle".

In other words, where I want a "delam"

[surfer_dave]

Doug, that is out of the box thinking man... I dig it..

[dougirwin13]

Thanks man 

The other thing I thought of was a bit of silicon spray.

[soulvoid]

Thanks man 

The other thing I thought of was a bit of silicon spray.

I wouldn't go anywhere closer than three blocks from something you want to stick and hold up with silicon spray. The stuff spreads everywhere when you spray it.

[dougirwin13]

Kind of why I avoided it.  Would have had to mask off everything else... Like made a tent around it.

Didn't fancy that so I spackled

[Bernhardt]

We've done quite a few

We used to insert 1" wide strips of our woven bamboo oriented vertically every couple of inches perpendicular to the box centerline overlapping the edge of the box by and inch or so. This is done with a hot knife slicing into the foam prior to placing on the bottom skin. We then route out the box as usual and insert. We use PU glue to set them when we bag  on the skin.

Just recently we realized that our particular method already has built in support for any boxes expecially FU or Ofishl single fin boxes. If you know how we make our blanks using panels of flat lowes/home depot foam sheets you'll get it..

I've had lots of failures using proboxes with out support so I still insert high density corecel plugs to insert the probox bases into. I even use the glass filler that Larry showed us now to improve the bind and reduce the exotherm.