I am doing a science experience prooving giant ships can float

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Discussion Overview

The discussion revolves around the physics of why large ships, specifically ultra large crude carriers, can float and remain stable in water. Participants explore ideas for simple home experiments to demonstrate these principles, as well as relevant formulas related to stability and buoyancy.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant seeks guidance on proving the floating and stability of large ships through simple experiments and formulas.
  • Another participant suggests that comparing the dimensions of the ship to the weight of water could be a basic approach, though they acknowledge it may seem obvious.
  • A participant raises the question of stability, noting the importance of the center of gravity (CG) and center of buoyancy (CB) in preventing capsizing.
  • It is mentioned that for ships of normal proportions, the CG is often above the CB, and if the CG is above the metacenter, stability issues may arise.
  • One suggestion includes building miniature ships of various sizes to observe their behavior in a wave tank, highlighting that larger ships are generally more stable than smaller ones.
  • A participant recommends familiarizing oneself with buoyancy and Archimedes' principle as a foundational concept.
  • Discussion includes the relevance of Reynolds number in understanding turbulence and its effects on ship stability.

Areas of Agreement / Disagreement

Participants express various viewpoints on the principles of buoyancy and stability, but there is no consensus on a specific experimental approach or the best way to demonstrate these concepts.

Contextual Notes

Some assumptions about the definitions of stability and buoyancy are not explicitly stated, and the discussion does not resolve the complexities of longitudinal stability versus lateral stability.

duskwood100
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I am trying to prove why ultra large crude carriers and other kinds of ships can float, and why they are stable in water?

The experiments need to be simple and doable at home. I also could use some formula for stability and dead weight and so on. Could someone please help me, maybe point me in the right direction :smile:

I have basic background in maritime apprentice motorman. I am doing this however as a physics experiment.
 
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duskwood100 said:
I am trying to prove why ultra large crude carriers and other kinds of ships can float, and why they are stable in water?

The experiments need to be simple and doable at home. I also could use some formula for stability and dead weight and so on. Could someone please help me, maybe point me in the right direction :smile:

I have basic background in maritime apprentice motorman. I am doing this however as a physics experiment.

No one's going to say anything?!
 
I guess that floating small models in your bathtub is not what you want?
 
With respect to proving the ships float, I was going to suggest simply taking the dimensions of the ship LxWxH and comparing the weight of water to the published weight of the ship - but that also seemed a bit obvious and a bit crude, so perhaps that's also not what was wanted?
 
Presumably the question relates more to stability in the water, why do they not turn turtle? Given the low density of the VLCC payload, that seems a reasonable question.

Afaik, for lateral stability the answer revolves around the center of gravity vs the center of bouyancy of the ship. If the CG gets too close to or even above the CB, bad things can happen. Longitudinal stability is another question, suggestions from more knowledgeable contributers will be needed.
 
As a first attempt, I suggest you familiarize yourself with buoyancy and Archimedes principle.
 
ty 4 all the help
 
For ships of normal proportions, the CG is often located above the CB. When the CG is located above a point called the metacenter, bad things can happen.
 
I think the gist of your experiment is that a larger ship is more stable than a smaller ship, right?

Well, you could build miniature ships of all different sizes and put them in a wave tank and see how they move. Those freight shipping liners are huge, so they aren't really affected by waves. Well, they can still tip over on some bad occasions.

On the science side, you can read up on Reynolds number and see what it says about turbulence which could make for a bumpy ride.
 

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