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akio.kanemoto · 28-01-2011, 14:23

Quote:

Originally Posted by thinwater

Is this a multihull? Is there a crash tank? Even in the skinniest cats I've owned, if there wasn't a crash tank a long-armed youth or a child could always get there. Sometimes I would extend the handle of a wrench. Make a large threaded backing plate and all they have to do is hold it in place while you catch a thread. Much simpler.

You said something about hex heads; I wouldn't. I would use plentiful antisieze and NO dissimilar metals. But I understand your point.

No, it's a monohull, no crash tank, here's a pic - deceptively spacious in there, but beyond the original fitting there, there is another 10cm, then no access - because it's solid - yet the deck continues above.

You'll also notice that the tie rods/plates angle forward, the the forestay from above pull backwards... which effectively means that the resultant load becomes a shear load on the deck pulling directly backwards.. so I don't think any of the load currently gets transferred to the hull.

I believe they did this so they could plate the forestay as far forward as possible to allow a larger sail (racing boat)..

I will be moving the forestay fitting backwards about 20cm such that the angle of pull from the forestay itself is aligned slightly behind the chainplate fitting. This way those plates will be the roughly the same angle as the forestay itself.

**capngeo** · 28-01-2011, 14:50

Quote:

Originally Posted by Bergovoy

i like these nuts, they are found on cheaper pressed wood furniture as that particle board has the same strength as foam.. heheheh

but, i dont understand the drawing/sketch... how is the core material removed and why? seems you remove it then glass it back in, then drill/core out soem holes for these T nuts?

I guess it is a bit misleading when I look at it.... The gray area was hogged out of the core then filled with low density filler and epoxy (like cabosil)... this was done to spread the load more effectively to the skin (the diagram was drawn for a Boston Whaler project.... they are nothing but foam inside!) Hogging out the foam core was easily completed using a bent welding rod through one of the future bolt holes. The red was high density filler (Milled fibers) and epoxy resin encapsulating the T nut.

I have some actual photos of the work if I can find them, I'll post them up

ETA: On this repair, a cleat had pulled out. The chronology of the photos is backwards, but I think you'd get the gist of what I'm talking about. Repair of the damaged skin made the removal of core easy... On others I just used a bent rod through the holes as mentioned above

delmarrey · 28-01-2011, 15:12

Quote:

Originally Posted by akio.kanemoto

Wow! Thank you for all your replies.

Many great suggestions in there!

In terms of tapping/threading epoxy - I might be able to do this for the first 4" or so to a depth of 2.5" or so, but thereafter, the maximum depth that I could sink the fastener would be about 1"... so not really possible to get to 10X the fastener diameter elsewhere..

As for tee-nuts from McMaster - I would kill to have a McMaster in Australia - but unfortunately all we have is something like a Home Depot and that's about it.. nothing more exotic than nylocs sold there.

McMaster-Carr

Quote:

Shipping orders outside the United States

We can ship our products throughout the world using air and ocean transportation services. We evaluate international orders from all new customers to determine whether we can accept them.

Read: McMaster-Carr Help

akio.kanemoto · 28-01-2011, 15:19

Quote:

Originally Posted by delmarrey

McMaster-Carr

Read: McMaster-Carr Help

Been there, tried that - it's a lie. They do not ship overseas (well at least to Australia) - I ordered several things online a while back, entered my card details etc etc.. and received this reply from them:

"Due to the ever-increasing complexity of U.S. Export regulations, McMaster-Carr has decided to only accept orders from a few, long-established customers of ours overseas. We cannot accept your order, and regret any inconvenience this causes you.
Your order has been cancelled."

All lies and extremely disappointing. But bottom line is - no McMaster access in Australia.