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If I have a tanker built about 1937, single shaft and a depth of 10.5 meter. I want to rebuild it as mothership for landingcrafts (as done by British too) And I want to cut the depth to 6 to 7 meters. Can I cut in the steel of the hull? like cut a part off. I know you can make the ship lighter and it will raise, but when I add tanks and LCTs it won't help. Also did Americans done this with shipship into lakers? Is it possible?

You can, though carving off the top isn't the way to go.
The easiest way would be to reduce the mass of cargo carried.

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Source Materiel is always welcome.

Yea Indeed. A problem I got in mind. If she not carried any oil (whish will be quite some) she will carry tanks, soldiers, weapons and LCTs you'll get around the same king of heavy weight

Not necessarily. The ship I work on can carry 35000 mt oil. That works out to some 540 M1s. However, even if we discount the gun and all the gear necessary to get them on board park and them hubcab to hubcab you can only fit ~130. That works out to about 8450 mt.
You could double that by installing an extra deck, but that still only comes to 20000 mt (I'm including ~3000mt for the deck)

In short you're going to run out of space much sooner than buoyancy. This will have the added benefit of reducing the ship's draught considerably.
Of course this only works out like this for my ship, but the general idea result will be the same no matter what ship you use.

_________________
“Close” only counts with horseshoes, hand grenades, and tactical nuclear weapons.
That which does not kill me has made a grave tactical error

Worklist

Source Materiel is always welcome.

Ah Okay. Well Thank-you for answering!! Now I can make the drawings!

You could use the bits you cut off to widen it..

It will only destroy the hull, designed properties. and the structural integrity.

And it will also be cheaper to build a new ship.

let's say... you could scrap the ship, melt the metal, make new plates of it, build an new ship of it....that would be easier then what you describe.

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Drawings are credited with J.Scholtens
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Unless you resort to bulges

_________________
“Close” only counts with horseshoes, hand grenades, and tactical nuclear weapons.
That which does not kill me has made a grave tactical error

Worklist

Source Materiel is always welcome.

true. but still.... removing plating from 'somewhere' and then reshaping it to fit elsewhere...... not impossible, but not the thing I would do.

_________________
Drawings are credited with J.Scholtens
I ask of you to prove me wrong. Not say I am wrong, but prove it, because then I will have learned something new.
Shipbucket Wiki admin