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Old 19-04-2016, 16:48   #76
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Re: 21th Century Ferrocement Yacht Hull Technology

Originally Posted by DumnMad View Post
One of my favourite ferro boats is Quais Quais. Home-built in the 70's left Vancouver 1980 and returned 2013. One leg from Durban to Nelson with no stops took 4 months at sea. I think they averaged around 3 knots. They were reported lost but turned up at Port Nelson one night a bit lean but otherwise fine.
I remember meeting them in cape town in 89, they were having problems with all their teeth falling out after an extended cruise of the indian ocean!.

seem to remember meeting them again in the pacific quite a few years laterr the boat was a grey Samson FC double ender if I remember correctly,french Canadians,nice people

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Old 19-04-2016, 17:17   #77
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Re: 21th Century Ferrocement Yacht Hull Technology

Originally Posted by Paul J. Nolan View Post
(As for the Hitler reference, I knew it was touchy because of his overwhelming identification with Ultimate Evil, but I couldn't think of a worse idea than starting World War II)
I understood, and I think it's redicilous to compare WWII to boat building ...
Now matter what the idea or plan is

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Old 19-04-2016, 17:18   #78
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Re: 21th Century Ferrocement Yacht Hull Technology

It might be worth looking up the orignial Helsal, she was a very experimental FC craft. Post stressed concrete and she might have also had fine stainless steel wires incorporated into the concrete to reinforce the surface layer above the mesh. She went on to win the sydney hobart.

But to be honest I cant see the benefit of using such an experimental method to build a large boat. The hull is a tiny fraction of the work and cost, so economizing on the hull is not the best way to save money long term.

Building the hull in sections glued together is not a good idea for offshore work IMHO. The biggest benefit of all the modern construction methods is the ability to make the entire hull and deck into a big monocoque structure with no weak points and a minimum of joints. And even on a GRP boat the hull deck joint can be a big source of problems, as can the keel/hull joint. To add extra joints is asking for problems.

On a traditional FC hull, a big source of problems is the way the deck joins the hull, if the deck is made from plywood. Ideally it is heavily glassed over onto the hull to make the joint watertight and strong.

Ive seen a couple of fer -a- lite polyester plastered boats. They seem to have stood up well over the years, and are far lighter than traditional concrete.

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