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Old 20-11-2019, 20:56   #1
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TITANIUM CATARMARAN

Betts | Titanium Catarmaran
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Old 20-11-2019, 21:26   #2
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Re: TITANIUM CATARMARAN

Be interested in the design background and specs. Really interested
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Old 20-11-2019, 21:33   #3
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Re: TITANIUM CATARMARAN

Way more money than sense I am thinking but someone has to take his money.
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Old 21-11-2019, 00:07   #4
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Re: TITANIUM CATARMARAN

I bet that will be fun when they contact an insurance agency to bind them. “ you did what? No one has one so how do the actuarials deal with a brand new type of cat with no previous research available?
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Old 21-11-2019, 01:03   #5
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Re: TITANIUM CATARMARAN

They can build that but still not punctuate "hulls" properly?
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Old 21-11-2019, 01:34   #6
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Re: TITANIUM CATARMARAN

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They can build that but still not punctuate "hulls" properly?
Really? Iíve met many marine service providers who might not have passed any of my English grammar exams, but could fix a diesel blindfolded! We have somebody building a patio who, Iím sure, couldnít make proper use of a semi-colon; he builds great patios though.

Respectfully,
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Old 21-11-2019, 03:13   #7
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Re: TITANIUM CATARMARAN

Interesting, doesn't look to be very long.

The difficulty of using ali for catamarans is making them big enough to enable the thinnest sheet to be used. The reason you don't often see ali cats under 50ft.

So looking at this project the use of Titanium seems odd. Although stronger, Titanium is about 1.5 times the density of ali, so achieving a weight benefit and maintaining a minimum skin thickness will be even more difficult.

Wonder who the designer is?
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Old 21-11-2019, 05:32   #8
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Re: TITANIUM CATARMARAN

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Interesting, doesn't look to be very long.

The difficulty of using ali for catamarans is making them big enough to enable the thinnest sheet to be used. The reason you don't often see ali cats under 50ft.

So looking at this project the use of Titanium seems odd. Although stronger, Titanium is about 1.5 times the density of ali, so achieving a weight benefit and maintaining a minimum skin thickness will be even more difficult.

Wonder who the designer is?

This from the website: C3/Marek 50' Catamaran https://sailboatdata.com/designer/nelson-marek
I've emailed to see what else they could share with the group.
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Old 21-11-2019, 06:49   #9
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Re: TITANIUM CATARMARAN

Man that would be a lot of back purging with all those welds.....
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Old 21-11-2019, 08:43   #10
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Re: TITANIUM CATARMARAN

Whatís back purging?
I ask as Iím wondering how you could submerge weld a hull?
Titanium is notoriously difficult to weld.
https://www.millerwelds.com/resource...ding-practices
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Old 21-11-2019, 08:55   #11
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Re: TITANIUM CATARMARAN

Look like Carbon fiber for the transom, gudgeons and rudder. Any idea why? I understand the deck and rudder, but transom and gudgeons seems like an odd choice when you are welding the rest of the hull.

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Old 21-11-2019, 09:00   #12
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Re: TITANIUM CATARMARAN

The molten puddle needs to be shielded from the atmosphere. Titanium is usually welded in a chamber that is vacuum evacuated then backfilled with inert gas usually argon but could include helium. Outside of a chamber the TIG torch provides the inert gas blanket but the backside (we usually like 100% penetration, right?) of the joint needs to be shielded.
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Old 21-11-2019, 13:14   #13
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Re: TITANIUM CATARMARAN

I’ve always wondered what you do when you dent a Ti hull - rather hard to fix, and not very pretty filled on an unpainted hull.

Not a big fan of composite decks on a metal hull - much prefer monocoque.
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Old 21-11-2019, 13:19   #14
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Re: TITANIUM CATARMARAN

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The molten puddle needs to be shielded from the atmosphere. Titanium is usually welded in a chamber that is vacuum evacuated then backfilled with inert gas usually argon but could include helium. Outside of a chamber the TIG torch provides the inert gas blanket but the backside (we usually like 100% penetration, right?) of the joint needs to be shielded.
yes but perhaps a grind down the back and then back weld , perhaps some sort of purge set up ,, like a half pipe ( plastic ) taped down the back ???,, crazy notion all together ,
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Old 21-11-2019, 13:23   #15
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Re: TITANIUM CATARMARAN

Really pretty easy to create the purge zone. Plastic bags work great, of course taped away from the heat zone. Flow argon into the bag through a diffuser and have at it. Just remember to not over pressurize the back purge area or the molten material will soon meet the tungsten!
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