so i want to make a SUP board that can support two people paddling not just one on the nose hanging out and me paddling.
intended use of the SUP board would be strictly for cursing and touring
ON FLAT DAYS don’t worry guys i ain’t gonna be in the line up. NOT with
this monster board
so person A weights 95 lb
person B weights 160 lb (these numbers are rounded up just in case)
I am planning on making the boards dimensions 12’x32"x3.5"
Now here’s the why do you have to do that ? sounds like a waste of time !!
i would like to make it out of wood( if possible) i will also do foam if
it is cheaper. On paper so far i have kiln dried white wood that
weights in about 8lb for 2x4x8 (its spruce or fir reason is because of
price). now my idea is to hallow out the beams like chambers to reduce
the weight to around 3 lb per beam. and if everything goes to plan it
should weight around 80 lb for the entire SUP board(just the wood and
glue, this is an estimate off the sketch i drew up). of course i am
going to make one of the beams this weekend to truly see if i can indeed
hallow out the wood and still make it stable enough to support the
weight and strain of its passengers.
but my real question is
do these dimensions(12’x32"x3.5-4") sound correct to hold up 2 people that in total, weighing around 240lb(maximum) ?
Is there a formula to find out the volume of the SUP Board ?
What would be the maximum the Board can weight in order to still carry its passengers and float correctly ?
would i have to make any bottom contours towards the nose to make it
more stable for the person up front or can i make it a flat bottom and
just change the positioning of the people ?
For good glide you really can't go too big. Getting the thing on and off the car might be your main limiting factor. With the estimated wooden board weight of 80 lbs, it probably wouldn't hurt to go bigger - at least thicker than what you have spec'd out. The rails can be completely full for maximum flotation. Maybe handles at each end for a two-person carry?
For easier synchronization of paddling strokes, you might consider a set of double blade paddles... The person in front sets the pace and the person in back follows.
A pivoting/steerable rudder might be worth a look.
If you are ever around Morro Bay you could try one I have that supports the sort of weight you're talking about.
80 pounds? Did I read that right? Is that before or after glassing?
80 pounds and 3.5" thick. Did I read that right. Two people... you might need a little more than 3.5 thick.......more like 5-6"
I'm new to "Flat Water SUP". My machine shaped 1.5# EPS Foam 12'6" is glassed with 6oz cloth. All my new SUP friends tell me how heavy my boards is. I can paddle for 40 min and then carry the board 100 yards to the car with one hand. And then lift it onto the car with no help. Never been on a scale....not 80 pounds.
80 pounds would need a boat ramp and a massive trailer and..and and and....and.....
...it's not my design but my SUP is a paddle board not a big surfboard...the nose looks like a canoe or kayak.....
Infinity in Dana Point has been making tandems in the 18-21 foot range, 1/2 lb eps, about 30 lbs. Lot’s of carbon tape needed. Blanks are custom, and all hand shaped. Steerable rudder or fore and aft finboxes. 14’ is the standard for a single person flat water, so forget 12’ for a tandem. Stay with foam, you might as well build a boat if you’re thinking wood cause you’re going to need a trailer and launching ramp. May even need to be registered as a boat with life jackets, etc. These are really dorky to paddle and steer; maybe they need a seat for a guy to beat on a drum to syncro like Viking ships. If you need quality time with someone paddling, save yourself a lot of time, money, and headaches and get a 2 person kayak at Costco for $400.
“Maybe they need a seat for a guy to beat on a drum to syncro like Viking ships” LOL yeah i guess your right i, i would perfer a tandem SUP board instead of a kayak or canoe. I have found foam blanks for a tandem board.
I'm on the wrong side of 200 and sometimes paddle with my 70 LB dog aboard. Between my girlfriend and myself we have a 12' Laird Surftech and a homemade board of similar dimensions: 12' X 31" X 22 1/2" N X 20" T X 5" TH
I've paddled both boards with the dog on each and they both seem to support the weight. I'm not doing any kind of competitive paddling - just flat water cruising. As already mentioned, bigger might well be better.
Ken Ebert at Segway has tons (literally?) of foam and machine cutting capabilities. You could download the design program to design one yourself or contact him and ask if he has any stock tandem SUP designs on file that wouldn't be a copy of someone else's proprietary design. I think he has some standard designs that would basically be a close tolerance blank after cutting. Anything would be better than having to completely handshape a rectangular sled-cut blank in the larger sizes. He's a nice guy and it wouldn't hurt to give it a shot if you live in Southern Cal.
Segway can cut 18-21’, but this is the only APS machine I’ve heard of with extensions that long. Hand shaping 1/2 lb foam in that size takes some skill as well as specialized racks, weights, etc. But if the time, patience, and money is there go for it. Here’s a link with photos of the blank and finished boards. The 21 footer is actually for a 4 person SUP, the 18 foot is a tandem. http://infinitysup.blogspot.com/2011/04/21-ft-sup-blank.html
hey thanks for the link, segway might be my choice for the blanks their home page seems to have alot of tandem sup blanks. i am starting to look farward to this build, its just the glassinng part might take some effort. maybe a two person job.
i just want to say thanks for everyones input and advice/help you guys have been very helpful appreciate it. ill let you know how the build turn out and keep you up to date with it. thanks for everything guys
They are scans from an old book but I can't remember which one. A quick thumb-through a couple didn't reveal the pics so I'll keep looking and let you know.
I have another that has been posted before in other threads of Duke, another guy and two ladies - all on one board. Duke is shown using a double blade paddle with a tether attached to the front of the board (boat?) It's a frame grab from an old Hawaiian travel film.