[Alberg30] Sally Ship

[Amy & David Swanson]

Hi -

I wraote a paper for a history a couple of years ago about a 17th century
Swedish warship called the Vasa, which sank on its maiden voyage.  The ship
was top heavy, and when the first gust of wind hit her, over she went.

Anway, one interesting thing I learned was that the standard test for
stability back then was to have 100 men run back and fourth across theship
three times.  The test was cancelled after one round on the Vasa because it
appeared it would capsize.  I am amazed to hear that modern warships undergo
testing thesame way.

The ship was raised in the 1950's, and articles appear occasionally in
National Geographic & Wooden Boat about her.

David Swanson
Strayaway Child
Alberg 30 #229
----- Original Message -----
From: "Robert Kirk" <isobar at cablespeed.com>
To: "Alberg 30 public list" <public-list at alberg30.org>
Sent: Sunday, June 08, 2003 8:47 PM
Subject: Re: [Alberg30] Sally Ship


> George Dinwiddie wrote:
> >>As I recall, the period was 13 seconds which translated to the old girl
> >>still having pretty good stability. The longer (slower) the period, the
> >>more unstable a given ship is for its size. (Obviously, if it doesn't
> >>come back up the period is infinite. But that's another problem.)
> >
> >Thirteen seconds seems pretty fast for running across a destroyer deck
and
> >back.
>
> No problem; my old destroyer's maximum beam was 13 yards, so there was
> plenty of time to get across. The worst problem was trying to get a
hundred
> sailors to run across the narrow space in the bow, stern and midships
> without elbowing each other in the ribs or knocking their friends down,
> accidently. I did mention "Chinese fire drill."
>
>
> >>I wonder what an Alberg's period is? Much shorter, of course. Maybe at
> >>the next raftup we can have a contest. The shortest period boat has the
> >>least weight aloft.
> >
> >I've never timed it, but that's one of my first responses when
> >aground.  Running from shroud to shroud and leaning out can rock the boat
> >enough to lift the keel off the bottom.  If the engine is in reverse at
> >the time, you can back off.
>
> A proper martinet of a skipper would have his wife do the running back and
> forth while he did the supervising.
>
> Bob Kirk
> Isobar #181
>
>
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