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Old 04 August 2016, 01:13   #11
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Quote:
Originally Posted by idsebby View Post
Should have explained my wooden floor was made of fiber glassed layered 1in marine ply.
Sounds like a nice solid floor idsebby..far more robust than my quicksilver wooden floor..

however IMO the subject is stringer strength and not floor strength. I can only imagine the join between the floor panels is the weak link ..and that is why the stringers are there.?

Perhaps more useful for beratís issue .. is to add the thickness..and sizing of the aluminium stringers that you had made ?

They form the main structural part for the longitudinal strength of a SIB ? I appreciate the tubes at correct pressure provide a good part of that strength..but I am under the impression the stringers are of a shape .. which is pushed onto the edges of the boards by the tubes. Properly assembled ...there is no movement whatsoever between floor and tubes..due to the carefully designed shape of those original stringers. Movement of the floor in heavy seas.. could cause accelerated wear on the tube surface..

Use to weak a material for stringers and if they snap (at that weak point on the floor joins)..could very well puncture tubes at sea.

I confess ..although Im a great DIY person .. a couple of hundred pounds for a main component in a SIB is nothing to me .. I spent more replacing my broken mobile phone last month.

Just my opinion..and is a valid as anyones . ..but I felt it worth mentioning what could happen if the stringers broke out in heavy weather.
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Old 04 August 2016, 02:48   #12
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Is your keel at full pressure. This is what keeps the floor in place as it pushes it up agains the other tubes. Most of the time the keel leaks in these and causes the floor boards to jostle. There was some one on here a couple months ago that was giving away a floor but they posted it in the rib side of things.
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Old 04 August 2016, 02:52   #13
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Didn't know how to post the url from my phone so here is the post.
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Old 05 August 2016, 00:11   #14
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Thanks guys for all advices and worst case scenario. I cant take that risk of broken stinger went through the tubes. I ride the boat sometimes more than choppy water like 4~5 bofor. That sounds like terrible.
I dont want to be a guy DIY things on the boats because I should be in the water in that times, i work too much
I cant find proper or original stingers in my country, so I decided to add these aluminium pipes.
Here is my stingers, i dont know if you can see the fractures
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Old 05 August 2016, 02:13   #15
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Quote:
Originally Posted by berat View Post
. I ride the boat sometimes more than choppy water like 4~5 bofor.
You too will be fully aware of the pounding the floor takes in rough weather berat .. Im also certain you will have the experience to know the strength of material to repair the boat...more than some folks who may just use SIBs occasionally for recreational use on good weather days

I cant see the fracture marks in the small photo.. but I would take Fenlander’s advice and try to repair them enough to keep them in position in the boat. While Im fully aware the pressure keel also helps keep the floor in position.. the stringers IMO are very important for that purpose..and is why they have the profile they have.

If the stringers are wooden.. and I couldn’t get replacement ones .. I would fill the fracture cracks with waterproof wood glue.. clamping everything tight shut until set .. then perhaps protect the area with a thin sheet of Aluminium attached to the outside at the fracture points..(similar to the ends I see already on the stringers.) This will be for tube protection only..if the stringers start to splinter again. Then replace the stringers in the boat. The stringers are obviously still weak so they are now only there to stop floor movement against the tubes.

The main strength of the floor joins will now have to come from your home made stringers attached to the floor as per your idea with the ali pipes that you have. Perhaps I would use stout 2” x 2” wood battons if available as they may be easier to secure to the floor than your pipe ? However .. whatever you use for the DIY stringers.. there is plenty room in the floor to add more than one each side..assuming you think its required. Over engineered or too many stringers will do no harm.. but under engineered stringers may bust in those seas you know and work in

Good luck with the repair..I think you have things well thought out for the materials you have easy access to
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Old 05 August 2016, 03:22   #16
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When I bought my boat i had a similar problem, the boat didn't come with any stringers. After taking advice from guys here on the form i decided against having timber stringers made and after emailing a lot of marine shops managed to track down a set of stringers.

I got mine from:

South Eastern Marine Services Ltd
Incorporating SEMS Aerosafe.
25 Olympic Business Centre
Paycocke Road
Basildon
Essex
SS14 3EX
Tel 01268 534427
Fax 01268 281009
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Old 05 August 2016, 11:11   #17
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By the looks of those stringers the easiest and quickest thing to do would be to find aluminum flat bar about 4 to 5 mil thick. Then screw and glue it on to the stringer. This will give you the extra support and keep the wood from splintering. Obviously counter sink the screws. After this you could wrap the whole thing in hypalon or a cheaper strong fabrics to keep it from splintering into the tube. By the time those crack enough to splinter into the tube the boat would be folded in half, And well you probably will be in the drink.
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Old 05 August 2016, 13:29   #18
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I agree with gurnard I carnt see the cracks but wood is a living material and will dry and crack, funnily enough I was looking on YouTube at a master boat builder in USA refurbishing a wooden fishing boat he was doing exactly what gurnard's suggesting and glued the timber up, those stringers are very robustly built as I see them so a good rub down repair as said and varnish should sort them out make sure the boat is inflated properly to support the stringers.
If they were mine I would support them at each end and try some weight in the middle to see if they crack or cracks open up to test there strength.
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Old 16 September 2016, 03:05   #19
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Thanks guys. I didnt post for a long time. I m depressed becuse of my floor is seperated two times and i dont use my boat too much, i dont trust it clearly.
I m thinking (actually dreaming) to replace the the floor with a rigid bottom if it is worth to what it costs. There is too many used fiberglasss bottoms without tubes in my country and if i can find compatible one with a resaonable price gonna work on it.
In other way its floor will be reassembled or changed and i keep in my mind your valuable ideas and comments.
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Old 24 September 2016, 05:36   #20
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Just put a solid piece of marine ply on top of it. Make it one whole part.
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