[Alberg30] Re: [Alberg30]movable staysail stay

[Richard Wagner]

I'm not an engineer, but if you look at heavy truck chassis's, there are no
welds. Everything including suspension parts are bolted on. The heat from
welding can change the characteristics and strength of the metal if not
properly done by expert welders.

Richard Wagner

> -----Original Message-----
> From: public-list-admin at alberg30.org
> [mailto:public-list-admin at alberg30.org]On Behalf Of chrishardy
> Sent: Friday, January 18, 2002 6:12 PM
> To: public-list at alberg30.org
> Subject: Re: [Alberg30] Re: [Alberg30]movable staysail stay
>
>
> I think that may be a good solution. When welding on the mast I think it
> is important to think about stress generated by the welding process. I'm
> not an engineer but I know that if you girdle the mast with a plate you
> set up "stress risers" at the welds or at the area where the added plate
> stops in the case of a riveted plate. You can demonstrate the stress by
> taking four strips of wood or plastic two about 1" wide 1/4" thick and
> 1' and two 6" long,  take a single strip and try to break it with your
> hands, now take a similar strip and double it with two other pieces half
> as long and try to break the single piece where the two backing pcs come
> together you will find that the piece is very easy to snap at the joint
> where the two backing pieces come together.
>   I would also worry about corrosion behind the welded plates in the
> dead space. I think I'm going to rivet mine on. Or just weld a small
> doubler right around the hole for the sleeve I don't usually worry about
> stuff like this but I'm reluctant to fool around with my old heavy A-30
> mast without thinking it through  first. I imagine to replace it would
> be tough....
>
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