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supplementary beams: which material?
3 Replies

I need some 3,40m or so supplenentary beams to construct a frame for a bathing ladder and are wondering what people here usually preferr in regards to materials.I have seen all sorts of materials…Continue

Started this discussion. Last reply by Kris yesterday.

Side hull window thickness?
7 Replies

The side windows on my Pahi 42 are not in the best shape... I guess no need for immediate replacement, but sooner or later it will be necessary.They appear to have been made from 10mm (cast?) acrylic…Continue

Started this discussion. Last reply by Kris Sep 23.

Sliding hatches repair?
2 Replies

My Pahi 42 comes with three sliding hatches for the deck pod and the two hulls. I like the design in general as it is easy to open by foot and strong enough to step on as well.But after what I assume…Continue

Started this discussion. Last reply by Kris Sep 11.

Epoxy filler for fillets and bonds, only micro glass beads or also chopped glass fiber?
12 Replies

So it looks like there hasn't really been any discussion on what type of filler for epoxy fillets is best.Looking at…Continue

Started this discussion. Last reply by Kris Sep 13.

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Kris replied to Kris's discussion supplementary beams: which material?
"So I checked again in the original building plans, and apparently the original Pahi 42 plans also laminate planks (18mm, up to 10 layers) of softwood for the main beams. Somehow the Pahi 42 I have didn't follow the original plans in that regard…"
yesterday
Kris replied to Kris's discussion supplementary beams: which material?
"This is also what I gathered from further web-searches. What about epoxy-glueing some regular wood plank together? Like for example 15mm ones in 4-5 layers? I assume the epoxy would penetrate quite deeply into the wood that way and thus hidden rot…"
yesterday
Robert Hughes replied to Kris's discussion supplementary beams: which material?
"In a long solid beam, plywood has half the strength of solid timber.  This is because 50% of the plies are running across or through the beam, not along it, and contribute almost no longitudinal stiffness.  Box or I-beams are a different…"
Wednesday
Kris posted a discussion

supplementary beams: which material?

I need some 3,40m or so supplenentary beams to construct a frame for a bathing ladder and are wondering what people here usually preferr in regards to materials.I have seen all sorts of materials being used, from aluminium bars to laminated plywood strips.On a similar construction that I have seen they used hardwood, but in that length and thinkness it is a bit hard to come by here and also expensive. Let alone transport issues at that length.Fiberglassing regular wood beams seems to be…See More
Sep 28
Kris replied to Kris's discussion Front netting with hinge and ladder? in the group Pahi 42 Owners
"Nice pictures! Yes a bit like the first picture except not with a walkway but a ladder on a hinge between two beams that can be lowered easily."
Sep 27
Andy Best-Dunkley replied to Kris's discussion Front netting with hinge and ladder? in the group Pahi 42 Owners
"OK, I've tried to put a few images of our front "netting" (actually webbing straps sewn together) and our central walkway - maybe this is what you are talking about? The first two photos are from 2019, the last from 2023. We now have…"
Sep 27
Kris replied to Kris's discussion Side hull window thickness?
"This design pressure is a bit mysterious. According to this website, a design pressure of 50 psf should be able to withstand a category 5 hurricane. But 50 psf is just 2.4 kN/m² not 70, like the formula uses."
Sep 23
Kris replied to Kris's discussion Side hull window thickness?
"I crunched the numbers for a hypothetical 200mm x 400mm windows which is pretty close to the actual size I have and the formula gives out 9.7mm acrylic thickness (6.47mm * 1.5 for acrylic). But the design pressure of 70 kN/m^2 that is part of the…"
Sep 23
Kris replied to Kris's discussion Side hull window thickness?
"Ah, found a rather complicated formular to calculate it here: https://www.cruisersforum.com/forums/f55/acrylic-portlight-thickness-267650.html#post3667716 I have to still crunch the numbers for my specific window size, but from a response by…"
Sep 23
Kris replied to Kris's discussion Side hull window thickness?
"I assume it largely boils down to thickness versus total size or rather maximum unsupported span. The eight side hull windows on my Pahi 42 are only like 40 x 20 cm each, making them rather small compared to other boat windows. But how strong is…"
Sep 23
Kris replied to Éric Bouvéron's discussion Solar panel with socket on the back
"I also ended up ordering another type from a German brand. They don't have the connector on the backside, but the price / value seems much better: https://www.offgridtec.com/en/offgridtec-etfe-spr-f-100-v2-120w-flexible-solar-module.html"
Sep 23
Brad Ingram replied to Kris's discussion Side hull window thickness?
"I used 6mm on my 21, and they seem more than adequate. "
Sep 23
Kris replied to Kris's discussion Front netting with hinge and ladder? in the group Pahi 42 Owners
"I took some in person pictures of the Spirit of Gaia ramp design when it was visiting Ponta Delgada last week. The Gaia team also suggested to make reverse on the front. The Gaia also has an interesting gangway in front of the second beam that I…"
Sep 23
Kris replied to Angie Richard's discussion Uneven dirt floor for Wharram build
"I am only renovating not building a Wharram, but I doubt the floor will be an issue for most of the work. I think dust and temperature could be an issue for the larger hull epoxy/fiberglass lamination works, so you might have to come up with a…"
Sep 23
Kris replied to Kris's discussion Side hull window thickness?
"Yes, that I know already, but which thickness is good?"
Sep 17
Ed Thomas replied to Kris's discussion Side hull window thickness?
"Acrylic or Polycarbonate (Plexiglas or Lexan)"
Sep 17

Profile Information

I am:
I own a Wharram
What boat (s) are you building or do you own?
Pahi 42
Country, City, and State?
Azores, Portugal
About me or us?
Just renovating my Wharram.
Looking to?
Exchange ideas about renovating an older Wharram
Website:
http://windswe.pt

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