Boat Builder Central - Builder Forums

Howdy all.

I asked a question in an old thread about the FS13 but didn’t get any luck with answers... I know there aren’t many of these being built. Or so not seems.

At any rate since time has passed my questions have changed.

At this point I am waiting on the foam to arrive and finishing up cleats for the deck. The plans call for a doubler under the middle compartment. The plans say that the doubler is for adding the handrail—for bolting it down. Mine will have no bar added and will be used as a SUP only. I have also removed the transom and slanted the aft 10” of deck towards the water (pics below).

Do I need the doubler for standing strength? Without it, will I dent the deck with a hard footfall? Since it’s only a paddeboard, I’ll likely walk around more for balance and trim. Do I need more than one doubler? Or none? The foam will be 2lb.

My thought is to take the two cut pieces of doubler and add one in the middle and one in the section aft. It won’t be enough for mounting hardware, but could be enough for standing?

Whatcha think?
Thanks
Ben

How thick is the deck? How much do you weigh (yeah.. that's personal, I know )? Are you installing cleats on top of the stringers and bulk heads? I would at least butt block the sole panels together.

I’m a little shy of 200. Thanks for asking.

I’m using 5mm ply. It’s not marine ply, just exterior rated. All the stringers will have cleats, and the forward bulkhead. The new stern will have extra bracing too, although no one will stand there, it’s just for ease of getting back aboard after a swim (intended or not).

The deck will have a butt joint and I’ll likely cover the deck in cloth too. A large portion of the deck will have SUP foam on it as well, which may help distribute weight (prob not by much).

Thanks

I built the SK14. It looks to me like you didn't use foam? The foam may be structural, and without it you may need a thicker sole. Maybe dry fit it and walk around on it? Still, I think w/o foam you'd need the doubler. My SK14 with foam is rock solid on and off the double section.

Dougster

Thanks Dougster.

I’m waiting for foam to arrive. But not adding cleats until I decide on my plan.

What thickness ply is the deck on your 14?

B

Hi,
I have built the FS13 and found out that with my weight 120 KG it is advisable to stand on the doubler which I installed exactly according to the plan and I built SS threads sticking up in the corner of the doubler to attach the handhold. The deck is suitable to walk on when it is floating and I also used thin plywood for it. I put cleats on all sides of the frames and then I put foam all in between. When I step on the deck on the water forward of the doubler I have the feeling it moves a bit under my weight, but so far it was always OK. I would definitely not step on the deck outside the doubler area while it is lying on land like the beach. My advise is what you suggested yourself to put the 2 doublers behind each other towards the stern and then you should be fine and in addition you should use cleats where the deck and doublers have additional support besides the support the frames give. Let us see pictures how you carry on building your FS13. It is true that not many FS13 are built, but I know all of the non builders like to see pictures of it being built.
Greetings from Karl ( Austria )
PS.: Look in my bateau gallery and my FS13

I believe my sole is 3/8" ply. I'll check later to be sure and correct if I'm wrong.

Dougster

No, I was wrong. I used 1/4" for the sole.

Dougster

You’ll fine without doublers if not installing anything which needs to be secured with screws, I use 5mm triplay and feels fine (I mean solid) when I step into the boat in areas where there’s no doubler below

A double thickness where the plans show it weighs very little and cost nothing. Look at the nesting: if you don't use that plywood, you must throw it away.
When I was younger, lighter and nimble, I walked very lightly around a boat deck and like Esonario, could have used an FS13 as a SUP without a doubler, Today, I am more than 200 lbs and not very agile and would need a doubler.

PS: For those who do not have the plans, the doubler is a double thickness of the sole in the middle compartment. Sorry, it's not proper English but that's the name I came up with.

It's actually triple thickness! Two 4mm glued together below the sole and then the sole above...

Hi all.
I started my fs13 back in April, got the foam in (I did not enjoy the foam) and then had to put it aside for while. Now I’m back, doubler in where the plans say, plus another behind it. Mine has the transom removed and Is solely a SUP.

I’m about to glue the floor/deck down, anyone use west six10 for that? How much regular epoxy did it take?

It looks so nice with the foam covered up.

Thanks!

Ben,

My wife and I do a lot of SUPing and a lot of SUP fishing and I have considered building my own sup. I like your adaptation of the FS13 and am very interested to hear how it paddles once complete.

On the Six10, here's a cheesy caulking caclulator: http://www.csgnetwork.com/caulkusagecal ... &length=36. Looks like a 1/4"X1/4" bead will get you almost 25' per tube.


Nice work and good luck!