[Public-list] Mast support beam

[Roger L. Kingsland]

Don,

First, thanks for the reference on exhaust systems.  Second, do you know
where I can find the Stewart Walker comments on mast rake?

Thanks,

Roger

Roger L. Kingsland, AIA
Managing Partner
Kingsland Scott Bauer Associates (KSBA)
N40° 27' 49"  W79° 57' 59"
3441 Butler Street
Pittsburgh, PA 15201
www.ksba.com

1(412) 252-1500 X101 - Office & Voice Mail
1(412) 779-5101 - Mobile (no voice mail)
1(412) 252-1510 - Fax


----- Original Message ----- 
From: "Don Campbell" <dk.campbell at sympatico.ca>
To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
Sent: Monday, May 03, 2004 9:23 AM
Subject: Re: [Public-list] Mast support beam


> In fact this will change the rake on the mast and you might want to read
some of
> Stuart Walker's comments on rake with respect to upwind performance in
race
> boats. I also think he has some good comments on how tight to have rigging
when
> sailiing. On Deck stepped masts, tight rigging only exacerbates driving
the mast
> through the deck amd since the Alberg 30 hull is as strong as it is, this
point
> at the base of the mast takes much of the downward force that the strong
hull
> can translate from the ends. Sailing World did a story of Aussie 2,  the
> America's Cup boat, when she broke up off San Francisco and they figured
there
> was a force of more than 500,000 lbs  upwards on the ends of that hull
when she
> broke in two. Be warned that you can generate very large forces with tight
> rigging because of the leverage effects of the length of the hull.
>     I don't think I would wait until the next time the boat is in a yard
to fix
> this deck/beam repair to avoid it  being  the weather that might bring
things
> to  deck level or below with a crash! Schedule the trip to the yard for
the near
> future.
> Don Campbell
>
> Mike Lehman wrote:
>
> > It may alter the sailing characteristics a small amount. It will have an
> > effect on the length of the shrouds. In particular, the headstay may be
too
> > long and the backstay too short.
> >
> > Mike Lehman
> > "Gilleleje" #505
> >
> > ~~~_/)_/) ~_/) ~~
> >
> > ----Original Message Follows----
> > From: "Peter Amos" <p.a.amos at tesco.net>
> > Reply-To: Alberg 30 Public List -- open to all
<public-list at alberg30.org>
> > To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
> > Subject: Re: [Public-list] Mast support beam
> > Date: Mon, 3 May 2004 13:21:30 +0100
> >
> > Mike,thanks for that.Next time Tait Tait is in a Florida yard I shall
unstep
> > the mast and do some reinforcing.Im wondering if repositioning the mast
step
> > forward an inch in addition to moving the mast forward as far as the
slots
> > allow would cause any problems.
> > Peter Amos
> >
> > _______________________________________________
> > Public-list mailing list
> > Public-list at alberg30.org
> > http://alberg30.org/mailman/listinfo/public-list
> >
> > _________________________________________________________________
> > Mother's Day is May 9. Make it special with great ideas from the
Mother's
> > Day Guide! http://special.msn.com/network/04mothersday.armx
> >
> > _______________________________________________
> > Public-list mailing list
> > Public-list at alberg30.org
> > http://alberg30.org/mailman/listinfo/public-list
>
> _______________________________________________
> Public-list mailing list
> Public-list at alberg30.org
> http://alberg30.org/mailman/listinfo/public-list
>
>



 1083607972.0