[Public-list] careening ship

[Roger L Kingsland]

Don,

A quick search reveled this site http://www.litco.com/wood-sizes.htm where
they sell dunnage (love that word) air bags.  A 2 ply, 4' x 8' costs $55
(with filler valve) and holds 40,000 pounds; should be enough.

Roger

----- Original Message ----- 
From: "Roger L Kingsland" <rkingsland101 at ksba.com>
To: <dk.campbell at sympatico.ca>; "Alberg 30 Public List -- open to all"
<public-list at alberg30.org>
Sent: Thursday, January 20, 2005 12:27 PM
Subject: Re: [Public-list] careening ship


> Thanks Don, good stuff.  If I have the hull blasted by others, laying the
> hull over probably wont be that critical.  Even lazy me can operate a
roller
> upside down.
>
> RE laying her over;  with nothing in the boat, the loads aren't
> unmanageable.  I imagine she weighs around 7,500 pounds (no rig, engine,
> tanks, hardware, beer, etc) and guess, because most of the keel load will
be
> carried there, the load on the hull will be less than 4,000 lbs.  One
method
> I thought of is to take a piece of 3/4" plywood and mount it on top of the
> deck holding it down with blocks and clamps at the window openings  (I
have
> removed the toe rail).  I could then fasten say, 16-2x4 blocks on the
> underside of the plywood against the rub rail (I have filled in the hull
to
> deck joint and there is solid epoxy under the rub rail).  This would
create
> 250 pound loads 6" apart at the hull to deck joint, one of the stronger
> areas of the boat.  I could then lower the boat and scribe and cut the
other
> end of the plywood so the entire length bears evenly on the concrete
floor.
> 2x4s fastened to the plywood would keep it from buckling under load and
the
> base could be connected to the 2x10 on which the keel rests to prevent the
> plywood from kicking out.  Lastly, I could reach behind my head with my
left
> hand and scratch my right ear.  All things considered, air bags seem allot
> simpler.
>
> Roger 148
>
>
> ----- Original Message ----- 
> From: "Don Campbell" <dk.campbell at sympatico.ca>
> To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
> Sent: Thursday, January 20, 2005 11:42 AM
> Subject: Re: [Public-list] careening ship
>
>
> > Roger
> >     There are heavy duty, paper covered plastic bags available to the
> trucking
> > industry that may be inflated to about 10 psi that are used  keep a load
> of boxes on
> > skids  in place in a trailer. They are about 5 or 6  feet long when not
> inflated. If
> > you really want to lay a boat over, then you might try these. They are
> about 30"
> > wide not inflated, so the area not inflated is about 1800 inches. If you
> use a
> > figure of 50% available area,  then 900 sq inches per bag, and at 9000
lbs
> that is
> > 10 psi if you only use 1 bag. If you were to use 4 or 5 it should work
> well at 7 or
> > 8 psi in the bags. The paper covering might be a pain to clean up but
> better than
> > the sand pile. I have seen these used by many shippers of fresh produce
> freight from
> > both California and Florida
> >     There is also the option of using  soda-blasting which uses baking
> soda to clean
> > the hull of bottom paint. This does not abraid the hull and may be used
as
> one would
> > with sandblasting equipment, but only uses about 60 - 80 lbs per hour,
> much less
> > weight and volume than sand. You may have seen its use in building
> restoration work,
> > specially after fires. It is very easy to direct the flow of material to
> any surface
> > and takes about 2 hours to do an AL30 hull, which is much less exposure
> for you  to
> > whatever heavy metals are on the hull than any other non-abrasive
removal
> system. As
> > for osmosis,  if there are any blisters, they will probably remain
> unbroken with
> > soda and you may then decide how best to attack whatever you need to in
a
> very
> > localized way. Rolling on a barrier coat and finish coat is not
difficult
> with the
> > boat upright except for the very bottom of the keel. I was able to lift
> the hull on
> > my trailer with the 8  pads,  so avoided that problem.  I have also been
> able to
> > take all the pads off one side of the hull at a time by adjusting the
lean
> of the
> > hull and, for safety, tying the hull to either a large piece of
equipment
> or the
> > wall of a building. Winches make it easy to exert force on the safety
> lines.
> > Don   #528
> >
> >
> >
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> >
> >
>
>
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