attaching parabolic stringers

ive looked and looked and couldnt find anything in the threads about it…

how do you attach stringers and/or high density foam to the rails of a blank?

what type of glue/resin is used to attach them?

im asking this because im shaping a 6’8’’ stringerless fish, and i wanted to put

some h80 or h60 divinycell rails on it. i have a LOT of the divinycell and so i

thought it would be a good application for it

Thanks

CTO

I’ve done 4 “parabolics” now. I glued all of them up with polyurethane glue (Gorilla Glue or Elmer’s). As long as you’re careful and don’t get it on the deck or bottom, it doesn’t show up too much after shaping. You can tape up your edges if you like but just being careful applying the glue worked for me. Do a search for “Drewtang.” He’s probably done more than anyone on here using high density foam rails (at least that post their stuff that I’ve seen) and has some really good looking boards.

My technique is to use the cutoffs to aid in clamping, using bar clamps to put it all together. Sorry, not a very good explanation, pictures would explain better!

Here’s an attached photo showing the glueup (sort of). A bit of the tail didn’t hold real well so I put the rail cut offs back on and reglued and clamped that section. Just gives you an idea of the clamping process.

ive looked and looked and couldnt find anything in the threads about it…

there is tons of info on this in the archives…look again

thanks surfthis, ive tried the same method you used and i think i might have over tightened the clamps so the rails came out kind of lumpy looking…

and i think i might need to clean up my outlines too

Best piece of advice I got from Sway’s (in the archives) was to only cut one side of your outline, use offcut to clamp (a la surfthis) wait to dry and then repeat for other side. sounds like twicw as much work but makes the glue up a lot easier and cleaner. Craftee is right, there is tons of this in the archives.

From this:

To this:

15 stringers & 6 high-density foam bands.

The Genius… who else?

If you use a heat guy on the divinycell you will be able to bend it around much tighter corners. Just put the rail in place, start bending in and heating the hard to bend places, and then let it cool in place.

thanks for all the help, ill post some pics of the board once its done

CTO

That can only be one ‘‘Genius’’ and I think I know the one…

More and bigger pics! Looks like he’s outdone himself, just what I’d expect from the old master.