Tripled planked yacht repair.

[raven mad]

Hi all, I’m not sure if this yacht has been mentioned on this forum before, Maggie, a triple planked nz kauri boat. It suffered leaking from a dodgy flashing job between cabin and deck!
i am going to take her on, as being 100yo o feel it a duty. And she is still pretty.
i haven’t found anything online for triple planking so I’m asking here. A penny for your thoughts.
anyone experienced?

the yacht has dried out, and the bottom paint is cracking off due to shrinkage,

do i I bath her is water and rehydrate or use epoxy coating?

[JamesCaird]

Re: Tripled planked yacht repair.

Raven- You just have to keep cutting back to good wood. Dry is best for epoxy, of course. I just finished rebuilding the stern of a large cold molded boat, (4 layers: 3 diagonal 3/8" then 3/4" fore and aft. all in epoxy. Water had gotten down between layers from screw holes in toe rail and stayed there as everything had been glassed over. The trick is to create "flanges " in each layer where necessary at edges of repair. Not difficult, only tedious. I glue and screw layers together and remove screws next day leaving screws where they connect to stringers or frames. Very strong repair and not difficult to keep fair. Good luck/ JC

[Boatsbgood]

Re: Tripled planked yacht repair.

Forum member JohnB is familiar with a number of vintage Kauri two and threeskin boat restoratons. A PM might be the way to get connected.
Brian

[wizbang 13]

Re: Tripled planked yacht repair.

I think you want to avoid repairing with epoxy if the rest of the vessel is not epoxy.
But I would prolly epoxy the decks to stop this from ever happening again.

[JamesCaird]

Re: Tripled planked yacht repair.

[QUOTE=wizbang 13;6763354]I think you want to avoid repairing with epoxy if the rest of the vessel is not epoxy.
Why is that, Wiz? Based on my own experience, I do not agree. / Cheers/ JC

[Peerie Maa]

Re: Tripled planked yacht repair.

I think you want to avoid repairing with epoxy if the rest of the vessel is not epoxy.

Why is that, Wiz? Based on my own experience, I do not agree. / Cheers/ JC

I suspect that Bruce is OK with gluing components, like laminated frames or cabin joinery. But cold moulding three lams of veneer into a patch in a triple planked hull that is not hot or cold moulded would be a bad idea.

[Slacko]

Re: Tripled planked yacht repair.

My understanding of one method if repairing this is that each plank is scarfed with epoxy, so that it is not glued to the adjacent planks.
There is some tool sharpening in your future to achieve this.

[Larks]

Re: Tripled planked yacht repair.

How were the original three layers fastened? Any glue of any sort between them? Resorcinol?. The only triple layer construction that I’ve sailed and worked on was built with each layer epoxy glued to the one below it and the hull sheathed.

It may be useful to know a bit more about the boat - particularly her age, length, design and builder (if known). Your frames seem quite widely spaced.

BTW, if she’s nice and dry you may consider sheathing her once repaired rather than hydrating the hull now - a lot of benefits for the effort, including easier maintenance and longevity..... I’ve just done so with my Huon Pine strip planked hull.

[Peerie Maa]

Re: Tripled planked yacht repair.

How were the original three layers fastened? Any glue of any sort between them? Resorcinol?. The only triple layer construction that I’ve sailed and worked on was built with each layer epoxy glued to the one below it and the hull sheathed.

It may be useful to know a bit more about the boat - particularly her age, length, design and builder (if known). Your frames seem quite widely spaced.

BTW, if she’s nice and dry you may consider sheathing her once repaired rather than hydrating the hull now - a lot of benefits for the effort, including easier maintenance and longevity..... I’ve just done so with my Huon Pine strip planked hull.

If this was glued,

the glue has failed. But there are no fastening holes visible.
She could be a basket case.

[Slacko]

Re: Tripled planked yacht repair.

This is the old school NZ way, reputed to have been brought from Scotland by Robert Logan when he came to NZ.
I'm happy to be corrected on my understanding of construction, but no frames, no glue
The first layer of planks are attached to the stringers, centreline and beam shelf.
The second and third layers are attached to the first layer.
There was sometimes a layer of felt between the planks.

[raven mad]

Re: Tripled planked yacht repair.

She is 100 years old. I’m not sure of exact length. Maybe 32’
there seem to be copper nails. I don’t think it’s a basket case, being in the water for 100 years is pretty good pedigree.
No?
prob more a lake And river sailer than ocean.

I should have clarified: that I a, wondering if coating the whole hull is fibreglass is wise? Ive read mixed opinions. And I need more mixed options!

what ratio of mixed opinions do I use?
does it depend on climate?
wind speed and hot air direction?

ok but seriously, all Input is very valuable to me and I totally appreciate it.

Many thanx

[raven mad]

Re: Tripled planked yacht repair.

This is the old school NZ way, reputed to have been brought from Scotland by Robert Logan when he came to NZ.
I'm happy to be corrected on my understanding of construction, but no frames, no glue
The first layer of planks are attached to the stringers, centreline and beam shelf.
The second and third layers are attached to the first layer.
There was sometimes a layer of felt between the planks.

this seems to be the way.
Im surprised by its construction. Big gaps in Boards. As in 2-3mm
im confused by shrinkage and how repainting hull will go.
is it normal to paint hull dry?
there doesn’t seem to be any paint in gaps meaning it was expanded when painted.

[Peerie Maa]

Re: Tripled planked yacht repair.

This is the old school NZ way, reputed to have been brought from Scotland by Robert Logan when he came to NZ.
I'm happy to be corrected on my understanding of construction, but no frames, no glue
The first layer of planks are attached to the stringers, centreline and beam shelf.
The second and third layers are attached to the first layer.
There was sometimes a layer of felt between the planks.

Thin calico or silk set in shellac was the normal waterproofing between the skins. Hard to make it water tight without.

[Peerie Maa]

Re: Tripled planked yacht repair.

She is 100 years old. I’m not sure of exact length. Maybe 32’
there seem to be copper nails. I don’t think it’s a basket case, being in the water for 100 years is pretty good pedigree.
No?

Many thanx

No. Some boats are dead after 30 years, some after 50. Being an antique is not a measure of boat quality.
As she is copper fastened, you can repair her, if you cut back the plank ends properly. You must avoid having plank buts in a straight line, stagger them, or cut them at an angle, and ensure that you put plenty of fastenings in both but ends into the inner veneers.
The biggest issue is finding a suitable squidgy filler to go in-between all those seams as she takes up.
Paint sticks to dry wood much better than to wet.

[Paul G.]

Re: Tripled planked yacht repair.

Not all boats are worth saving and it really does depend on how much $$ you have. Best advice I can offer is to get a good wooden boatbuilder with real experience to have a look and assess the situation. It will be the best couple of hundred bucks you will ever spend. I am familiar with 3 skin boats and they are not too difficult to repair but you must understand what you are up for, riveted or not, calico or felt, this boat is way past a tickle up and a quick coat of paint. Your boat is 99% likely to be glued, on solely riveted boats they usually have either one or two inner diagonals and one fore and aft on the outer layer, so the glue in yours (most likely resorcinol) has failed or is failing. You may be up for a whole new skin over the top of the existing as it looks pretty rough.

As a sidenote, they often built diagonal boats like out of shorts to save money on the full length planking, not that its all bad but it means that it may have been built on a tight budget and all that entails.