"Hi, it might be of interest to you that on Tiki 38 - similar size and weight Wharram - the rear “netting” beam is specified as 140mm diameter aluminium or wooden beam - and it is not a construction beam.
pretty much the same size as…"
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Kris's Discussions
supplementary beams: which material?
7 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 Monika Matis Oct 24.
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?
13 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 Oct 19.
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"So, after using the stuff a bit:
the 409 works great at a filler for repairs, but to prevent it from dripping on non horizontal area you need to add a lot which results it in being quite weak in the end. Good for non-structural things, but not…"
"Yeah, this is how the beams are build in my pahi42 too. I realized now that there was an update to the building plans, and I looked at the old ones.
But I think the old method is still used for the lighter front beam and is probably sufficient for…"
"My box to beam fastening but gives idea of beam constuction."
"I built my Pahi 42 beams as per plans (I-bean style) - used x3 18mm marineply centre pieces laminated with Resorcenol and x3 top and bottoms hardwood (Balou) planks strengthed with triangle hard Merantie pieces between top/bottom and centre…"
"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…"
"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…"
"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…"
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
"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."
"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…"
"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."
"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…"
"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…"
"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…"
"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"
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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