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 Post subject: Magnum Wing Alloy
PostPosted: Fri Dec 30, 2005 6:00 am 
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Joined: Fri Jul 15, 2005 10:43 am
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Location: St. Louis, MO
Does anyone know the aluminum alloy used in the magnum wing frame? I want to weld in some extra bracing to strengthen them and would like to use the same alloy.

Thanks,

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'84 H16
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 Post subject:
PostPosted: Fri Dec 30, 2005 6:43 am 
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Joined: Mon Jul 14, 2003 7:11 pm
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Location: Detroit, MI
Most marine extrusions are 6061, but Matt M. would know for sure (I think he's on vacation this week - no e-mail responses).

Welding Al is very tricky - the metal will lose a significant portion of its strength in the heat affected zone if you're not careful, especially if it's the 6061-T6 version.

There's an Alcoa spec sheet on it here.


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 Post subject:
PostPosted: Fri Dec 30, 2005 6:59 am 
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Location: Clinton Lake Lawrence, KS
Has to be 6061-T6 and Matt is 100% correct as far as additional welding. Find some one that is a reputable aluminum welder (with lots of experience) and they can advise you of the chances of sucess in welding additional pieces. My father (87 year old retired A&P and airframe mechanic) commented he has never seen any better joints than those on our Magnum wings and they have been rode hard long before they became our property last year. I'd suggest you try them first, you may be suprised at how tremendously stout they are.

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 Post subject: Magnum Wing Bracing
PostPosted: Fri Dec 30, 2005 1:43 pm 
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Joined: Sat Jun 21, 2003 7:14 pm
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Location: West MI
I purchased used Magnum Wings last summer and didn't get them on the boat. :roll: If the welds and end caps are good & tight you should be good to go. The only thing I plan on doing for additional bracing is to get the SX Wing bracing. (Ordered last summer but the dealer still hasn't gotten them from Hobie for me yet :( ). IMHO the bracing will remove any front to rear movement of the wings, prolonging the end cap to frame rivits.

Matt M has stated to me that it is un-necessary to brace the Magnum wings, but as I will be sailing in large waves on Lake Michigan I like things bullet proof.

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DVL 1989 H-18 Worlds Boat, Magnum Wings & Spinnaker

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 Post subject:
PostPosted: Tue Jan 03, 2006 9:02 am 
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Thanks for the info guys. I want to add the bracing between the two loegs on each end of the wings to make a triangle. It seems that the smalles diameter leg supports the most weight. And it is the only member in compression. By adding the extra piece of metal, it would help with those loads. I am not too worried about the fore and aft movement.

And yes, I have access to some very good Al welders at work.

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Nick

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'84 H16
'82 H18 Magnum
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 Post subject:
PostPosted: Fri Jan 06, 2006 8:21 am 
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Location: Clinton Lake Lawrence, KS
Image

Nick,

My Mag wings don't have this tube between the upper and lower. Is this what you were thinking about doing?

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 Post subject:
PostPosted: Fri Jan 06, 2006 12:19 pm 
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Exactly... but I may rethink the sail modifications :)

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Nick

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'84 H16
'82 H18 Magnum
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 Post subject:
PostPosted: Fri Jan 06, 2006 12:53 pm 
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Location: Clinton Lake Lawrence, KS
Ironically, this Sunburst color is exactly what I purchased as our racing sail. We're working on numerous batten pocket repairs. I hope this color is not a bad omen! These poor folks from Texas were hit by a squall with 50 mph winds. :shock:

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 Post subject: Wing Modifications
PostPosted: Sat Jan 07, 2006 8:09 am 
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Joined: Sat Jun 21, 2003 7:14 pm
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Location: West MI
8) Nice, Never did that to a sail, maybe I will try to do that as an excuse to get a new one.

I noticed that the SX Wings in the picture did not have the recomended "struts" that go from the rear main wing supports to the hulls to reduce the for-aft movement of the wings. I do know that the SX wings are rivited together while the Magnum Wings are welded.

Although I haven't studied a SX wing, (as an engineer) I am at a loss as to why a aluminum support runs between the short tube and the main one on a SX wing? IMHO Stress force is up where the wings bolt to the crossbars, the force is down on the outer point of the hull where the wing is pinned.

Perhaps Matt M can answer that one. :?:

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DVL 1989 H-18 Worlds Boat, Magnum Wings & Spinnaker

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 Post subject: Re: Wing Modifications
PostPosted: Sun Jan 08, 2006 5:45 pm 
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DVL wrote:
I noticed that the SX Wings in the picture did not have the recomended "struts" that go from the rear main wing supports to the hulls to reduce the for-aft movement of the wings.


The wings in the picture look like Magnum wings to me. SX wings are longer towards the stern than Magnum's.


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 Post subject:
PostPosted: Sun Jan 08, 2006 7:35 pm 
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Location: Clinton Lake Lawrence, KS
They are definitely Magnum wings, there is no extension, of the seat, fore or aft of the front and rear crossbars. The other tip off is the LARGE diameter tubing.

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 Post subject:
PostPosted: Mon Jan 09, 2006 6:42 am 
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Joined: Fri Jul 15, 2005 10:43 am
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Location: St. Louis, MO
You add the bracing to form a triangle. Same idea with roof trusses.

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Nick

Current Boat
In the market
Previous boats owned
'74 Pearson 30
'84 H16
'82 H18 Magnum
St. Louis, MO


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