FS13 doublers needed?

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Ben Coombs
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FS13 doublers needed?

Post by Ben Coombs » Wed May 13, 2020 2:49 pm

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
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cape man
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Re: FS13 doublers needed?

Post by cape man » Wed May 13, 2020 3:54 pm

How thick is the deck? How much do you weigh (yeah.. that's personal, I know 8) )? Are you installing cleats on top of the stringers and bulk heads? I would at least butt block the sole panels together.
The world always seems brighter when you've just made something that wasn't there before - Neil Gaiman

Ben Coombs
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Re: FS13 doublers needed?

Post by Ben Coombs » Wed May 13, 2020 4:50 pm

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

Dougster
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Re: FS13 doublers needed?

Post by Dougster » Thu May 14, 2020 10:11 am

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

Ben Coombs
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Re: FS13 doublers needed?

Post by Ben Coombs » Thu May 14, 2020 1:54 pm

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

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gonandkarl
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Re: FS13 doublers needed?

Post by gonandkarl » Fri May 15, 2020 3:06 am

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
All pictures of Micro Petrel AD14 and FS13 :

http://gallery.bateau2.com/index.php?cat=87433

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Re: FS13 doublers needed?

Post by Dougster » Fri May 15, 2020 9:37 am

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

Dougster

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Re: FS13 doublers needed?

Post by Dougster » Sat May 16, 2020 9:05 am

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

Dougster

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