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423zero View Drop Down
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    Posted: 18 Sep 18 at 8:43pm
Does anyone know what grade of aluminium you need for masts/booms etc ?
Round type similar to Laser.
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JimC View Drop Down
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Posts: 6660 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 18 Sep 18 at 8:57pm
I believe its specially heat treated, I'm not sure its a standard grade. I have used standard grade alloy for a boom when I was broke though, I used 4 inch and cut lots of holes in the less stressed areas for weight and it lasted for years.



The holes are mostly behind the sleeve for the mainsheet, but you get the idea...

Edited by JimC - 18 Sep 18 at 9:04pm
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423zero View Drop Down
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Posts: 3419 		Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 18 Sep 18 at 9:50pm
I am attempting to set up a supply chain for Minisail owners, contact I have for Aluminium wanted to know what grade, he can get different grades, though he has just supplied what he had in stock and had no complaints.
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Riv View Drop Down
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Posts: 353 		Post Options Post Options   Quote Riv Quote  Post ReplyReply Direct Link To This Post Posted: 19 Sep 18 at 10:13am
Read this thread from sailing anarchy:

http://forums.sailinganarchy.com/index.php?/topic/50081-laser-masts/
Mistral Div II prototype board, Original Windsurfer, Hornet built'74.
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423zero View Drop Down
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Posts: 3419 		Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 19 Sep 18 at 8:22pm
Reccomended grades

Aluminium 5000 series alloys (5083, 5086)
Aluminium 6000 series alloys (6061T5/T6, 6082T5/T6)
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piglet View Drop Down
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Posts: 514 		Post Options Post Options   Quote piglet Quote  Post ReplyReply Direct Link To This Post Posted: 21 Sep 18 at 10:34am
We did this for Laser top sections years ago.
Managed to get some tube through Blackburn metals:
6082 T6 2"x14SWGx6.7m
But it wasn't anodised and the 6.7m length didn't work out for the 3.7m top section.
More hassle than it was worth.

On the other hand I have found many practical applications for busted top sections, including a Miracle boom and squirrel proof dove cot posts.
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