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Old 02-01-2010, 12:52   #16
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Originally Posted by IslandHopper
By the way, these are steel not alloy...
Steel I could accept. The Eiffel Tower is steel constructed, although riveted. Welding of mild steel needs no other treatment except for corrosion protection. These would be great on a steel boat! Painting would be a chore unless taken down and spray painted.
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Old 03-01-2010, 21:11   #17
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Wow, this post has longer legs than I imagined. The more feedback the better. Thanks for the input.

To recap the most recent comments:

The owner has not mentioned wind noise, I'll ask him about it

It only took the owner and a pro a day to weld all the joints so it wasn't a long process.

Strength of welds; I'll ask him, he's a PHD and a real hands on guy so I'm sure he's addressed this somehow, I'll ask.

My main question, that some have already commented on, is whether it will pay an aerodynamic penalty verses a standard elliptical mast section. Some say definitely yes! Any one else care to comment?
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Old 04-01-2010, 05:21   #18
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Island Hopper, Do you have any contact details for the owner of this yacht?
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Old 04-01-2010, 16:15   #19
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Island Hopper, Do you have any contact details for the owner of this yacht?
Sorry, no.....
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Old 04-01-2010, 18:30   #20
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In welding aluminum it is all about the alloy , a heat treated alloy(6061 with a t6 heat treat) will lose much of it strength when welded A strain treated alloy(5053 ) will keep most of its strength when welded
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Old 04-01-2010, 19:31   #21
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A couple of weeks ago I seen this type of mast on a cat. I think they may have gone with the ARC or something. It was at that time.

Why use such a complicated and difficult to build thing if one can have much less hassle (and turbulence!) from and extrusion?

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Old 04-01-2010, 19:38   #22
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In welding aluminum it is all about the alloy , a heat treated alloy(6061 with a t6 heat treat) will lose much of it strength when welded A strain treated alloy(5053 ) will keep most of its strength when welded
Is 5053 used in marine environ?

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Old 04-01-2010, 20:22   #23
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Is 5053 used in marine environ?

b.
Well my memory is not so good but yes 5023 and 5051 with h111 strain hardness is used in the marine industry, fuel tanks and such 6061 T6 considered aircraft alloy cost less and is more readly available but is heat treated but stronger in a non welded state
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Old 05-01-2010, 00:32   #24
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The 5000 series aluminums are more noble (less corrosive) and that's the reason they were developed.
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Old 05-01-2010, 04:54   #25
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I got a 16 metre 235mm x 154mm aluminium section delivered to my door for $2500Au. I can't see the sense in doing all that cutting and welding to build the truss type.
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Old 05-01-2010, 20:40   #26
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With a conduit in it it sure makes running wires easy. Remind me of lighting trusses.
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Old 05-01-2010, 22:18   #27
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I'm surprised its cheaper, thats a lot of work.

However, if noise/turbulence is your main concern, you could probably skin it with something like heat shrink dacron or polyester, skin-on-frame aircraft/kayak stylee.

Not sure if you'd then be best to proof/paint it or leave it breathable, but I guess you'd need something to confer UV resistance.

Dope? Latex paint? Bitumen paint? linseed oil? waxed finish?
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Old 06-01-2010, 11:23   #28
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Do you have any photos of your mast , i haven't seen any in the file you have?
Is it also aluminium type?
Thanks
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Old 06-01-2010, 11:31   #29
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Once upon a time there was a boat named 'Tea Cup' anchored - I think permanently - in the ICW, by Galveston, TX. Teacup had a mast as described - I think the owner converted an old land-based antenna mast - I had always heard that it was a bad choice due to turbulance it would cause - who knows?... This was in the 1980s, I believe Teacup perished somehow before ever going anywhere....

Fair, non-turbulent winds to all!

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Old 08-01-2010, 19:01   #30
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Do you have any photos of your mast , i haven't seen any in the file you have?
Is it also aluminium type?
Thanks
Yes, it's just your usual aluminium mast section. I got it from here: Whale Spars index frame page it's the 235 section.

It is actually visible in one photo:

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