tomo, coke tap filled with resin, glued in (only the resin), drilled, tapped, milled for the bolt to sit flush.
salu2
uzzi
you can get hex head cap screws and actually mold them into the cap
then uscrew them when they cure
just make sure you use some silicon or something so it relaeases on the thread
i still prefer goretex though
they are hassle free and again the board is at constant equal pressure
Pete,
I always respect engineering expertise, and you’re exactly correct that all eps will (try to) expand when heated.
It can be contained, however, by a structure of sufficient strength.
Almost all our boards are clear and very bright white, oweing to the low resin content. They are reflective enough
that solar heating is not an issue. We’ve done all kinds of torture testing, but painting one black and leaving it out in
the sun would force things, and probably melt the core.
I don’t encourage anyone to thermally abuse their Coil, largely because it’s unnecessary fatigue on the structure.
But I do tell them not to worry about leaving the board in a car for a while, or letting it sit out on the beach, or taking
it on an airplane, etc.
Yep, a breathing vent will allow air out during loads and soak up air when relaxed… interesting what this does to the ride…
I do 'em screwthread in resin plug myself.
“Good to post that pic of the blown-up board, too.”
Hi Mike -
That’s not one of mine. Good on you guys in Florida that are so far ahead of everybody else.
I pinched the pic from The Board Lady site. In my opinion Eva Hollman is a reputable authority on the subject and has lots of stuff about this topic on her site. Note that some of the examples, including the one I posted, are of big name brands that do not install vents because they don’t think they’re needed…
http://www.boardlady.com/bottombubble.htm
http://www.boardlady.com/heatdamage.htm
"And speaking of vent plugs: opening yours whenever you are off the water is the single most effective thing you can do to prolong the life of your board. Leaving it closed will cause the EPS foam core to expand and contract at least once a day. You take any substance, no matter how stout, and you push and pull it continually, at least 365 times a year, and it will fail. Guaranteed!
It’s not that much, you say? I just measured my Trusty Old 9’-4": typical summer day, near sea level, early morning, cool 60 degrees, it was 4 15/16" thick. Then the day warmed to 89 degrees, a thermal low developed, and the board expanded to 5 3/16". That is a whopping 1/4" change, or 5%!!
Get into a routine, where you tighten the vent screw just before you put on your harness, or some such thing, and it will become second nature, and you will not forget. But DO IT!" (From The Board Lady site “Care and Maintenance” section)