boat Under Water
 

What is the best way,To Raise a 50' Wooden Boat.
It is sitting in 15' of water. This boat has a concrete keel &
the weight is around 40 tons. The Keel will be removed,
after it's out of the water. It was added in the late 70's
I forgot that it is a 1967 Navy Boat. The only thing,
above water is the radio antenna.

"Mikel Warehime" wrote in news:rIJbd.8026
:

What is the best way,To Raise a 50' Wooden Boat.
It is sitting in 15' of water. This boat has a concrete keel &
the weight is around 40 tons. The Keel will be removed,
after it's out of the water. It was added in the late 70's
I forgot that it is a 1967 Navy Boat. The only thing,
above water is the radio antenna.




The problem is both that it is wood and it is heavy. If you simply seal
the hull and pump air in or fill the hull with inflatable bags you will
most probably 'pop the top' i.e. the deck and superstructure will break
away from the hull. This can be alleviated by placing support straps
under the hull and keel with inflatable bags attached on each end. Then
as air is introduced into the hull the outside bags are also inflated,
balancing the forces. All in all not an easy or cheap thing. I once did
this with a steel hulled 40' riverboat. The trick is to evenly apply the
air at the same time and rate inside and outside and sise to side to
avoid 'popping, as well as capsizing

The second alternative is to bring in a barge mounted crane and sling.
ALso not cheap. That boat better be worth a pretty penny 'cause that's
what it will cost to recover it.
g'Luk

--
MonteP
"Against stupidity, the very gods themselves contend in vain." -
Friedrich von Schiller
"Ignorant voracity -- a wingless vulture -- can soar only into the depths
of ignominy." Patrick O'Brian
-=The answer is simple...send pretzels to the Whitehouse!=-

On Fri, 15 Oct 2004 06:00:55 GMT, "Mikel Warehime"
wrote:

What is the best way,To Raise a 50' Wooden Boat.
It is sitting in 15' of water. This boat has a concrete keel &
the weight is around 40 tons. The Keel will be removed,
after it's out of the water. It was added in the late 70's
I forgot that it is a 1967 Navy Boat. The only thing,
above water is the radio antenna.


[thinking out loud]

40 tons of lift - say 50 tonnes of water displacement.
50 thousand kilograms is 50 million ccs
that's a volume of a box dimensioned
4 meters X 4 meters X 3 meters

that's eight bags of 2 X 2 X 1.6 meters
Eight BIG canvas bags, with plastic liners.
And four ten ton webbing straps.
And some bottles of air.

And a tug.

Sounds like all kinds of fun!

Brian W

Is dynamite (and a boom and barge to catch and hold the debris) an option?

Brian Whatcott wrote:

On Fri, 15 Oct 2004 06:00:55 GMT, "Mikel Warehime"
wrote:

What is the best way,To Raise a 50' Wooden Boat.
It is sitting in 15' of water. This boat has a concrete keel &
the weight is around 40 tons. The Keel will be removed,
after it's out of the water. It was added in the late 70's
I forgot that it is a 1967 Navy Boat. The only thing,
above water is the radio antenna.


[thinking out loud]

40 tons of lift - say 50 tonnes of water displacement.
50 thousand kilograms is 50 million ccs
that's a volume of a box dimensioned
4 meters X 4 meters X 3 meters

that's eight bags of 2 X 2 X 1.6 meters
Eight BIG canvas bags, with plastic liners.
And four ten ton webbing straps.
And some bottles of air.

And a tug.

Sounds like all kinds of fun!

Brian W

Creative thinking.
Outta the box....
I like that in a person!

Brian W

On Sat, 16 Oct 2004 02:07:03 GMT, Jim Conlin
wrote:

Is dynamite (and a boom and barge to catch and hold the debris) an option?

Brian Whatcott wrote:

On Fri, 15 Oct 2004 06:00:55 GMT, "Mikel Warehime"
wrote:

What is the best way,To Raise a 50' Wooden Boat.
It is sitting in 15' of water. This boat has a concrete keel &
the weight is around 40 tons. The Keel will be removed,
after it's out of the water. It was added in the late 70's
I forgot that it is a 1967 Navy Boat. The only thing,
above water is the radio antenna.


[thinking out loud]

40 tons of lift - say 50 tonnes of water displacement.
50 thousand kilograms is 50 million ccs
that's a volume of a box dimensioned
4 meters X 4 meters X 3 meters

that's eight bags of 2 X 2 X 1.6 meters
Eight BIG canvas bags, with plastic liners.
And four ten ton webbing straps.
And some bottles of air.

And a tug.

Sounds like all kinds of fun!

Brian W

Hi

"James" wrote in message ...
But a lot depends on why she is sunk.
If she has large hole (or holes) the problems are different to if she sunk
slowly due to heavy rains over a long period of neglect.
If the hull is sound and you beach her, you will have to pump her out as the
tide goes down... or the water inside will very possably damage her.
If she is somewhere non tidal.. thats a different set of prodlems
More data is required!

The safest way its to get your hands on one or two barges, the concept
is that you get wires around the hull and tigh these as tight you can
onto each barge each side the sunken vessel, then you flood the barges
as much you can tigh the wires again and bail out the water of the
barges.
You say the weight is round 40 tonn ,but I guess this is lower
submerged ,still as what James say it is about the final step ------
to be sure that when you can't lift more by bailing out water from the
barges, that the deck is above water, as if not you must plan to have
the sunken hul free from the sea bed so you can move it to more
shallow water and redo the process untill enough of the deck is above
water. You se even it is 40 tonn you don't need more than 40 cubic
meters to lift that and you soon reach this volume . Then where most
make the mistake, is not preparing for the final lift, as quite often
just a feet or so is what is needed ----- that case be prepared to
stop the leaks ,build a temp. wall and have plenty of pumps.

Hi
Forgot to add, that if there are tide you use that ofcaurse, as beside
filling up the barges with water you do that on low tide, acturly with
enough tide you don't even need to flood the barges, just tigh the
wires at low water, wait for the high water to make the barges lift
the hull and move the whole fleet to lower water and then redo the
process untill just the deck is above water or you can make som temp
walls to make the hull itself lift it's own weight ,usealy at that
time you bail out 5 buckets to get one bucket out untill you found all
leaks .