Are the 2011 cults closed cell ?? I think I may of read something Years,ago but can t remember , reason for asking is I think I ve put a small crack my mast track .. I think they may of done closed for this year and gone back in 2012 .. any insight? Cheers ... Ps its that really colourful homo looking board if that helps
There was a video in this forum back in 2011 (that I can no longer find) where old mate had one on a table and talked about some different foam being used or some crap... But your prob right cheers ... So its not carbon !! Wtf. How much does yours weight mark?? Mines 7.5kgs minus straps & fins ... 83l quad ...
Mine is the single and they do feel heavy - and particularly heavy at the back. They used the same shape for single and quad, so I strongly suspect that most of the last foot is all d'cell block!
I can't weigh mine right now and RRD's .pdf I have does not specify weight hmmmmm. But mine is a 92 single anyway, so may not help much.
Def all glass though
Why are boards not made of closed cell, all off them.
Does it not perform as well, heavier, cost more?
At some point in most boards life the outside layers are going to crack ( or bung get left out) and it will just end up with water through the whole board.
Has it got a bung? That's the big give away, if it's got a bung, it's open cell, (unless it's a stony custom built for a euro, he was telling me some of them insist on a bung, they just don't understand the significance of closed cell construction) if it hasn't it's probably closed cell, ( some NZ styro techs don't have bungs).
Unfortunately closed cell styrene (extruded, not expanded) is heavier and more expensive. It's designed as insulation underground supporting concrete floors, so it needs to be dense enough for load bearing, and closed cell so that it doesn't absorb water, which would compromise it's insulating qualities.
Closed cell urethane is possible, it's how Stony builds his boards. But that is also a bit heavier and the blank has to be blown very close to the finished shape of the board, as the density varies through the blank, being more dense near the skin. It's just so much easier to have a huge block you can hot wire any shape you like out of.
Decrepit,
My limited knowledge regarding extruded polystyrene is that whilst its closed cell it does off gas and can delam initial layer if gases build up excessively in localised area. Appreciate if someone could elaborate.
Dunno if having a bung is an indicator in this instance. Normally it is, but if RRD did a short run with closed cell cores, Cobra would probably just have whacked in air vent bungs as per usual .... ????
I'd be very interested if RRD did do closed cell for one year, and why / why no longer etc etc
I have a 2011 RRD FSW. I have noticed after it sits in the sun and I open the vent it does not hiss or I see no airbubbles if it is wet around the vent plug. I thought maybe it was leaking but I weigh my boards every month or so if I have used then a lot and it has not put on any weight at all.
So now you have me thinking it could be closed cell????
It weighs 7.3 bone dry with 4 straps so not silly heavy but not super light either. Yes it is biaxial glass no carbon, they used black pigmented resin to give the sanded carbon look. Gives the board a nice soft ride though, no harsh carbon pounding in chop,
I'm convinced that they are , its got the same balance point as the stone boards (other 7kg+ boards have heavier tails, fanatic etc ...) . Same weight per liters , it was around the time companies were experimenting with that pu foam . If you press your ear up to the vent hole it never makes a noise (open cell boards even with minimal water inside do like a sea shell) .. also I'm sure in that vid, a new foam was talked about .. cheers anyway .. ps anyone snapped one ??
Hmm mine doesn't hiss either. You are making me wonder now
I was maybe going to make it a thruster one day.......... but the board is pristine so don't wanna router it just yet!
How about a few drops of water in the bung hole, wait a minute, then turn it upside down and it it runs out it is closed cell. ?
Good idea mark ill try that next time I sail and ill post .. could be awhile though ... If you try it b4 please post ... Thanks
EPS, expanded polystyrene IS closed cell foam,
en.wikipedia.org/wiki/Polystyrene
It's beads of closed cell foam pressed together, the water gets into the spaces between the beads, think of a jar full of glass beads and water, plenty of water gets in there between the beads.
It's lighter than the other kind of SOLID closed cell foam like XPS which is prone to delaminate. One surfboard company makes XPS boards with little breather holes all the way around the board, water WILL not soak into the foam but the gas needs to escape.
On the other hand water soaks into an EPS board like a sponge even though the foam is closed cell.
Some unscrupulous dealers will make claims about using "closed cell EPS foam", insinuating that water cannot soak in.
All recent production boards, excepting perhaps some BIC boards are EPS, styrofoam, same stuff as a beer cooler.
The Open Ocean guy explains it here pretty well.
I suspect the board in question,, is poly urathane not poly styrene .. beagle . Open or closed cell I'm unsure
The only windsurfing boards not EPS styrofoam are custom made (except some BIC boards)
Look into the vent hole of any SUP or recent windsurf board, white Styrofoam beads.
Closed cell like XPS is too tricky for those little asians to make correctly and it's too heavy, they don't care if it's a sponge.
^^^ they only do what they are told and if RRD wanted to try a different core, Cobra would have done it as asked.
I don't see why you can't believe that and keep going on about all mass produced boards being stryo cored. They do try all kinds of funky stuff.
2011 is when RRD went away from carbon and kevlar in the waveboards and went to all biaxial glass, like what Goya had been doing successfully for a couple of years. It is not beyond belief that they also tried a different core material that year.
My 92L RRD of that age is heavier than my 105L Goya which has the exact same construction. So the XPS or PU core may in fact be true. Nobody knows for sure it seems.
R2908: phone RRD 
+39 0564 452304/455786
+39 0564 452304/455786
mine was also black. A bit of poking reveals it to be dust sitting on top of the foam. Tried to dig some core foam out with a screw to no avail.
Scrape it away with a small flat bladed screwdriver and suck it out with a vacuum.
OK WARNING!!!!!
be very careful with this!
If you seal a short plastic tube to the vent hole with some sort of mastic, you can GENTLY blow or suck into the tube. If it's closed cell, you'll only move the air in the tube, if it's open, you'll move the air in the whole board.
The difference should be noticeable.
But blow too hard and you could loose the bottom of your board!
