[Public-list] Mast support beam

[Roger L. Kingsland]

Gord;

GREAT story, too bad those masts are so darned flimsy!

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: "Gordon Laco" <mainstay at csolve.net>
To: "dk.campbell at sympatico.ca, Alberg 30 Public List -- open to all"
<public-list at alberg30.org>
Sent: Monday, May 03, 2004 10:04 AM
Subject: Re: [Public-list] Mast support beam


> Hi there -
>
> Can't resist telling a story from my early days in the business.  A fellow
> was having a new rig built... I was interested in learning how the old one
> came down so kept asking questions whenever he came in.  After initial
> reluctance, he admitted the following stranger than fiction story.
>
> "I was sailing along and noticed that the shrouds on the low side were
> loose, so I tightened them.  Later, on the other tack the shrouds on the
> other tack which had been tight now seemed loose, so I tightened them.
>
> (here is where it gets good)
>
> "I realized that the pressure of the wind was pushing the rig to one side
or
> the other so I went from one tack to the other tightening the shrouds
after
> each tack trying to make them uniform.  Then the mast broke."
>
> Honest, that's a true story..
>
> Gord
> #426 Surprise
>
>
>
>
>
>
>
>
>
> > 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
> >>
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