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Old 27-12-2006, 22:13   #1
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Hello : new aluminum cat buider need help?

Hello everyone :new in this forum and looking to meet someone building in aluminum in the u.s.or anyone that with sugestions and ideas in methods,design etc....i'm new at boat building but i'm a builder /designer of houses /buildings with experience in wood steel and concrete having built trailers,machinery,toys ... i'm looking at building 50 by 25 sailing catamaran in aluminumand everything is basically new to me but so far i've drawn the basic plan and came to the decision to use 5086 1/4 inch for hulls and strutural areas and 3/16 for the rest.the frame for now will be 6061 but no sizes yet....i was looking to build in asia because there aluminum is less than 2 dollars a poud versus 2.80 here and labor cheaper but because i only will hire a welder the risks with bad material ,security are not worth the few dollars if any i'll save.... i've read a lot of posts here and in other forums and have learned a lot...please if you have any comment or sugestion or idea it will be apreciated....thank you Korvello

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Old 27-12-2006, 22:44   #2
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Welcome aboard Kovello. There is quite a bit of info here on aluminum boats. Here is a starting place:
Canadian boatbuilder -- aluminum?
Take a look around and feel free to ask away.

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Old 28-12-2006, 00:17   #3
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Aloha Korvello,
Welcome aboard!! I'm a fiberglass monohull guy but wish you well in your extremely big project. Lots of information here on this forum. Dive right in.
Kind Regards,
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Old 28-12-2006, 00:34   #4
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G'day Korvello, you've come over to visit this site I see.

Welcome, and I hope you have some better result's here.

"Money can't buy you happiness but it can buy you a yacht large enough to pull up right alongside it"...............David Lee Roth
Long Distance Motorboat Cruising It Is Possible on a Small Budget
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Old 28-12-2006, 01:01   #5
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Welcome aboard korvello

The main problem that I've seen in alum. consted boats is stress areas. Right in corners where the boats twist, is where cracks seem to form, usually right next to a weld. Stanchons welded to a deck is a common place. And some places along where the deck meets the hull.

Personally, If I were to build with alum. I'd do a strong frame with rounded corners where ever possible.

One thing you have to remember, alum. shrinks after a weld. When one welds the hull skin to a frame, it should only be skip welded. A solid weld will suck the skin in all the way down the frame and it'll show on the out side.

I'd recommend crawling around inside a few alum. boats, young and old, to see the do's and don't's about construction. You'll see what happens with different procedures.

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Old 28-12-2006, 09:14   #6
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Have a small aluminum catamaran center consul fishing boat (28'). Have had corrosion on the through hull pipe for the deck wash down, was not flushing it with fresh water when hauled out, it leaked. The second was not thoroughly washing out the bilge with fresh water, accumulated salt led to corrosion/pitting that I weld filled. Originally bought aluminum with the perception that I would have rough handling due lack of ramp and haul out instead launching of a beach. It is rougher but not significant would now go glass.
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Old 28-12-2006, 21:04   #7
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Hi : tank you guys as always wise ideas ...indeed i've found great info thru this and other forums ...about price does anyone has rough numbers of what can cost a 50 foot cat to build without going too fancy or know of someone that has built one ...K

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