How much should this board weigh?

I’m working with some different laminating methods, and I’m wondering about weight,  I’m almost done with a 7’-8" rounded pin, and I want to know how what I’m doing compares with the industry standard.

So the run down is,

  • US Blanks Red.  7'8" EA
  • 7'-8"
  • 21" wide point
  • 11 1/4" nose
  • 13" tail
  • 2 3/4" thick, and I kept it pretty much as thick as the blank would let me go the whole board.
What would this board weigh if it had say a 6x6-6 lamination?

Thanks

bitchin’.

cabossil don’t bulk but increase noticeably young modulus and hardness. Additif F don’t increase as much hardness, but it permit a blush free resin curing, blush “soften” the surface of resin. Solvent reduce viscosity and they can be use to modify mechanical properties. Oven curing too. Up to 5% of xylene or denature ethanol or methanol can be use to reduce viscosity without big modification of mechanical properties. In some case those modification can be a good thing to adapt the properties to the need, for surfboards durability (ding and snap) it’s more important than fiber… (from sandwich engineering)…

Sorry for my frenglish

not sure, but I’ve been experimenting a bit with it. We know that Add F increases barcol hardness and a lot guys don’t use that. Too much additive (via xylene or alcohol) and yeah you’ll probably reduce strength by stretching the phycial amount of resin applied in x given area on the part. I don’t think you’ll entirely kill it. I shot a test that had 10% alcohol and this stuff still cured fine, took much longer to fully cure though. 5% or less is great for really wet laminator requirements IMO.

Denatured alcohol cleans up my spreader and tools, and I noticed it’s use in viscosity reduction after working with stiffer resin than 2100. Seems to tailor just fine into projects. 

I heard thinning epoxy kills the strength, something like 10% thinner cuts strength my 50%.  something like that

I’ve added 5% alcohol thinner on a KK PH shoot and it was basically water. With add F, watch it run.

"Alcohol Thinner

**A unique blend of alcohols that can be used up to 5% for viscosity reduction."**

 

**http://www.resinresearch.net/id5.html**

** **

tried the balloons, they actually surfaced over the nylon on a test. That was a mess… But this slurry is money, anyway it’s yielding results. The whole hand layup literature on .7 from GM has me interested in bridging the first ply, albeit via a custom epoxy gel slurry–especially for upcoming large boards. But eventually, bagging as many boards as possible you bet.

why not thin the epoxy a bit? Don’t alcohol thinners eventually evaporate?

VÆSKE,

In my humble opinion, skip the cabosil.  It is a thickener, to prevent drips and sags.  Use microbaloons to bulk without adding weight, when dripping isn’t a problem.  

Instead just soak the N-fusion, squeegee off the extra and bag it.  I need to find a super low viscosity epoxy to work with some of the fabrics.  The weave is so tight, it takes forever to soak in at heavier weights.  I either need to use the lower denier stuff, or get a lower viscosity epoxy.  Anybody know a low viscosity epoxy that is water clear?

Thanks Ian.

I’m right about where it should be.  20 days and we can all take it for a test drive.

Ambrose,

I did the drop tests.

Fiberglass and resin standard punctured at 2 feet drop.  The lay-up I’m doing punctures at about 8 feet drop.  Bad part is each layer has to be laminated seperately, and takes about an hour a layer.  Not for production, but if you have the time, and hate patching dings…

1.5# is my latest block, stuff requires a lot of fabric, more resin, similar weights to poly constructions even with really stingy dry layups and blank sealing prep. Infact, I cloned a poly Cordell with 1.5# EPS and followed Graphite Master’s recommendations on schedules and my EPS board came out heavier. 

**Looking forward to 2# EPS. **Made a wakeboard in this density for my nephews to destroy and they still rock this 2#er.

2.25# EPS would be perfect for fabrics IMO, 1.5# + a stiffer resin is great for full carbon (open water/race). I heard under 2# for veneers is great, but I’ve yet to start veneers.

 

EDIT: Also something I’ve been experimenting with is the inital N-Fusion ply against the foam. I’ve been doing hand layups with .7osy plys with an expoy gel slurry blended by adding Cabosil and then thinning w/denatured alcohol–not huge amounts, just enough to achieve the gel–which spreads great into the plys. Stretches the epoxy. I follow up a second ply (minus rail wrap) w/straight epoxy. Did a peel test: basically the same bond against the EPS bead–based on my eyes for what it’s worth. EPS is weak by default, that first atmosphere on the skin is Mad Max Thunderdome, no rules. Two men enter, one man leaves.

Who knows, could be wasting my time. or increasing chances for a delam. But right now, it’s producing slightly lighter boards on shorties…the weight savings on bigger flatwater SUP race stuff are the weight-saving prospects I’m after.

will it dent or shatter first .

the test format

of dropping a steel bearing

from 3, 6, and ten feet

the bearing weight should take

a variety of weights 8 oz.

1 lb ,and 3lb,further increases

in weight incrementally to ten lbs are

optional.Rail tests at 1’ three feet and 

sixfeet dropped on edge onflat concrete

granite cpbblestone on edge and

steel guard rail on edge.*

just a test…

…ambrose…

optional test 

lose board on the point at rincon at hightide

and pick it off the rocks way in the cove.

we used to prefer the Yater glass job.

*simulates lunchmeat running into your rail at full trim

while you paddle over the shoulder at flatrock.

dont mind me …

…Sounds good!

AI M13 surftech 7’6" = 9.6Lbs light weight in my book.

AI M13 poly 7’8" = 11.5 LBS

M10 Gun & 7’10" Poly 19.5W 6x4ozT &6ozB =10.4LBS

Chris Voss Hawaii GunPoly 7’6" 18.5W x 2 3/4thick [img_assist|nid=1045447|title=Step up boards|desc=|link=none|align=left|width=640|height=417] =9.6 LBs

Home made 7’10" Poly 19W 6x4oxT &6ozB=11LBS

Homade damage control gun 7’8" Poly 6x6x4deck & 6x4 bottom 12.5lbs

sometimes ........light boards are over rated........for old guys....like us.

I dumped the super light eps 7-5 and kept the heavy poly board......funny how that works.....

Thanks Mike.

That’s right about where I’m coming in at. 

I got a little carried away with the fabrics.  3 different fabrics, 4 different fibers.  10.2 ounces of fabric on the deck.  8.2 ounces of fabric on the bottom.  I could probably get away with lighter weights.  Or go EPS.

9.5 lbs

Right, 

I’m just checking on my work against others.  I used very little fiberglass, most was other fabrics.

What do similar sized boards weigh?

Completely (well almost) depends on how dry you laminate it.  Most of the weight will be resin.