If we had 4 identically shaped 8’-6" x 29" x 4 1/8" boards, which one would be less likely to break or buckle?
NOTE: I haven’t decided yet if I’ll go with 1 pound or 1.5 pound EPS.
BOARD #1: No stringer and glassed w/ 6 + 6 + 4 deck and 6 + 6 bottom. (All E cloth and wrapped around the rails.)
BOARD #2: Same as above but with a wood stringer.
BOARD #3: Same as #1 with no stringer but run 3" wide carbon tape from nose to tail on both sides. (See Infinity below)
BOARD #4: Similar to #1 but replace one layer of 6 oz E on the bottom with one layer of 1/2" Vectornet wrapped around the rails and replace the other layer of 6 oz E with 4 oz E. (See Kings below)
Thanks.
Any advice on making this board as light and strong as possible will be appreciated.
The picture I saw on Kings website appears to show his boards as stringerless. As for construction,I’m sure some of the pro’s on this site could better answer this, but the last “big board” I built was 1.5# w/ 6+6+4 top & 6 +4 bottom, but I have a 1/4" basswood stringer & layer of Innegra on the bottom as well & used epoxy. Haven’t broken it yet(though I did blow out one future box when I landed on it after a fall). I don’t know enough about the vector net, but it seems like it wouldn’t add that much strength. I also don’t think that a 3" strip of carbon on the bottom is strong enough when a wave pile drives that log into the bottom after a fall.
Good luck with whatever you decide. Post some pic’s when you build.
Evrythings that increase skin flexural stiffness increase local buckling skin stiffness. Evrythings that increase overall stiffness reduce local buckling forces and increase flexural fatigue strengh. Stiffeners are more effective at max load place, farthest of neutral fiber in flexion. But my last work show me that you must not forget “l’effort tranchant” (i can’t traduce with my phone) because breaking are mostly 3point flex with max flexural stress at same place as max effort tranchant.
If you want ultimate strengh by weight go with composite sandwich skin on 1lb foam. More board have volume more strengh by weight advantage increase with this tech.
Thanks but using a composite sandwich skin means that I’d have to vacuum bag, correct? I should have mentioned it before but I don’t want to bag this board. This board will be hand layed up. However, to minimize weight a bit I was going to use the “Dwight Method” where I’ll wet out the cloth on a flat table first.
What schedule would you recommend for a hand layed up board with 1 or 1.5 pound EPS? Another question is how much weight will I save by going with 1 pound?
Magentawave - Yes I did vacuum bag my board. You are correct that the innegra is more work to wet out (which is one of the reasons that I Vac.bagged it). Also, the innegra was not the outermost layer; i put one of the 6oz. over it.
With hand lay up no weight gain because you have to use more glass on 1lb foam. Vac bag foam or wood skin is easy to do end by far effective for strengh, then you hand lam over. On 1.5 EPS go with 6+4 under and 6+6+stand up patch for deck. Seal foam with époxy micro slurry and lam over.
Someone told me they can get me Innegra for about the same cost as 6 oz E, but I kinda blew it off because of the wet out issues I read about. Did you wet out the Innegra on a flat table first or on the board?
Does Innegra come in different weights like E and S do? What weight did you use?
It’s been a couple years since I built that board, but yes it comes in different weights & also different weaves. Best to talk with the Innegra rep. (or check out the website)f to determine which you need.
As for cost, it’s not as cheap as regular cloth. As a rule of thumb, it’s about half the cost of carbon (& the rep joked with me that it’s the “white” carbon).
I’m happy that you are open minded. However, when I see a kook paddle out on a barge sup it kinda freaks me out so I understand the sentiment. Of course I’m wary when a kook paddles out on a regular surfboard too. For what it’s worth… I abide by the same respectful rules with sup surfing as I’ve done the last 40+ years with regular surfing. That means I NEVER surf crowds, I NEVER cut anyone off, and I don’t hog the waves. And even if I wanted to hog waves (and I don’t), I couldn’t because the length of my board dictates that I be closer inside than longboarders.
IF you are open minded enough to get into it… I have to warn you that it’ll be one of the most challenging athletic things you’ve ever done (seriously!). The rewards are that you’ll end up in better physical shape than you’ve ever been in your life, you’ll catch 10 to 20 times more waves per session (without being a dick), and you’ll feel the same awesome stoke you felt when you were a grom.
I like what the Paddle Woo podcast guy does when he experiences negativity in the water… He offers them $100 CASH if they can stand on his sup for just 30 seconds. Only 30 seconds! He’s had lots of takers but has never had to pay because no one can do it. They always paddle away with a newfound respect for how difficult and challenging high-performance sup surfing is though.
You should see what Pat Rawson is shaping for guys like Mo Freitas. They are scaled up from high-performance short boards and are only 6’-10" to 7’-6" x 23" wide x 3 3/4" thick. I mention that because lots of small high performance sups have stringers, so no, but sorry, I don’t understand what you are saying.
Magentawave- I like the way you explained that. Health issues no longer allow me to do regular surfing (knees,shoulder,etc) but I’m finding a way to get waves. Isn’t that our goal?
I try to follow the same rules that you abide by, but sometimes I run into d**khead surfers that are gonna hate SUP’s just because. It’s the same fight that went on years ago between the skiers & the snowboarders. Hopefully, it will eventaully mellow on the water, like it has on the mountain. There’s no denying that some SUP ers are rude wave hogs, unfortunately a few bad apples ruin it for everyone.
I hope you still post your build here on the site. There are still some open minded people that want to see it.
my statements are very basic. You added a whole bunch of stuff that I did not say. those are your words not mine. I do not like SUP in the line up. period.
Lets start with the fact that you need to decide what foam you want to use. I would never never use 1 pound foam. You ask question and then come back as some sort of expert when you don’t like the reply… Swaylocks is fun because everyone wants to re-invent the wheel… If you came to me with a 1.5 pound EPS SUP that was 4.5 inches thick I would say 6x6 bottom and 6x6 top…or we could go a little lighter and do 6-4…
you"ve never cut any one off ??? really?..ya man…I bet you have some beach front property in Palm Desert for sale too… funny funny…funny. Got a 3 day weekend going surfing hard core…see you on the flip side…Stingray
