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20-11-2019, 19:56
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#1
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Registered User
Join Date: Jun 2014
Posts: 135
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TITANIUM CATARMARAN
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20-11-2019, 20:26
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#2
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Marine Service Provider
Join Date: Dec 2006
Location: Brisbane Australia
Boat: Multihulls - cats and Tris
Posts: 4,859
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Re: TITANIUM CATARMARAN
Be interested in the design background and specs. Really interested
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20-11-2019, 20:33
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#3
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Registered User
Join Date: Jun 2016
Location: Australia
Boat: Milkraft 60 ex trawler
Posts: 4,653
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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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20-11-2019, 23:07
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#4
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Registered User
Join Date: Mar 2015
Location: San Francisco Bay area
Boat: Condor Trimaran 30 foot
Posts: 1,501
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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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21-11-2019, 00:03
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#5
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Registered User
Join Date: Mar 2018
Location: New Zealand
Boat: 50’ Bavaria
Posts: 1,809
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Re: TITANIUM CATARMARAN
They can build that but still not punctuate "hulls" properly?
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21-11-2019, 00:34
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#6
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Registered User
Join Date: Apr 2013
Location: Md
Boat: 2013 FP Lipari 41
Posts: 1,298
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Re: TITANIUM CATARMARAN
Quote:
Originally Posted by Tillsbury
They can build that but still not punctuate "hulls" properly?
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Really? I’ve 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, I’m sure, couldn’t make proper use of a semi-colon; he builds great patios though.
Respectfully,
__________________
LeeV
Lipari 41
s/v AMERICAN HONEY
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21-11-2019, 02:13
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#7
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Registered User
Join Date: May 2014
Boat: Shuttleworth Advantage
Posts: 2,246
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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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21-11-2019, 04:32
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#8
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Registered User
Join Date: Apr 2013
Location: Md
Boat: 2013 FP Lipari 41
Posts: 1,298
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Re: TITANIUM CATARMARAN
Quote:
Originally Posted by Tupaia
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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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.
__________________
LeeV
Lipari 41
s/v AMERICAN HONEY
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21-11-2019, 05:49
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#9
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Registered User
Join Date: Jun 2009
Location: Skippack, PA
Boat: Lagoon L42
Posts: 162
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Re: TITANIUM CATARMARAN
Man that would be a lot of back purging with all those welds.....
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21-11-2019, 07:43
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#10
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Re: TITANIUM CATARMARAN
What’s back purging?
I ask as I’m 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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21-11-2019, 07:55
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#11
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Registered User
Join Date: Mar 2010
Location: Annapolis MD
Boat: Building a Max Cruise 44 hybrid electric cat
Posts: 3,194
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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.
Matt
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21-11-2019, 08:00
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#12
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Registered User
Join Date: Jun 2009
Location: Skippack, PA
Boat: Lagoon L42
Posts: 162
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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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21-11-2019, 12:14
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#13
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Registered User
Join Date: Apr 2019
Posts: 1,355
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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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21-11-2019, 12:19
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#14
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Registered User
Join Date: May 2017
Location: Scotland
Posts: 873
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Re: TITANIUM CATARMARAN
Quote:
Originally Posted by RoadRacer
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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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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21-11-2019, 12:23
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#15
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Registered User
Join Date: Jun 2009
Location: Skippack, PA
Boat: Lagoon L42
Posts: 162
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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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