Questions tagged [ships]

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Which type of aircraft carrier is more cost-effective and more reliable in the long run? [closed]

All of the >100,000 tonnes US aircraft carriers are nuclear-powered. On the other hand, all Chinese and British aircraft carriers are conventional powered. Which type of aircraft carrier is more ...
1 vote
4 answers
664 views

Ship Stability And Overturning Moment

Here a ship that is tilted due an external force . the buoyancy and weight force will create an overturning couple that will rotate the ship in the clockwise direction. Now, the moment equation was ...
0 votes
2 answers
166 views

Power requirements for a 50,000 TEU container ship

I understand that this may be incredibly vague, but based on current container ships, does anyone have an idea of how much power a 50,000 TEU (TwentyFoot Equivalent Unit) container ship might require? ...
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4 answers
116 views

Why aren't there many ships with transom bows?

Transom basically is a flat aft, usually vertical. It reinforces the structure, adds deck area, and because that the flat part is above the waterline, no fluid dynamic is hurt. The extra deck area is ...
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0 answers
80 views

Does somebody know what this piece of equipment is?

I got this equipment from a sailor, I have no idea what this is. Does anyone know?
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-1 votes
1 answer
120 views

How much longer could Titanic have remained afloat if it had gotten rid of its anchor and chain right after hitting the iceberg?

I am wondering how much longer the RMS Titanic could have remained afloat if the crew had allowed the ship's anchor and anchor chain to fall to the bottom of the ocean immediately after the ship had ...
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0 votes
1 answer
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Ship Longtitudinal Centre of Gravity Position

This question is designed to get help from someone (with some important important questions), so that I can get an understanding on why I cannot quite get the correct answer for this question ...
2 votes
2 answers
102 views

How are ships stacked ontop of other ships?

As shown at this skeptics SE post, there are ships that carry other ships as cargo, etc... My question: how are the ships stacked onto the flat bed ship? Is there some kind of specialized crane that ...
3 votes
2 answers
294 views

Disposition of the generators on the shipwrecked Costa Concordia

Recently I have been reading about the shipwreck of the Costa Concordia, unfortunately what I read is not online, so I have no links, but it raised a lot of questions. A rock hit by the ship tore a 50-...
2 votes
1 answer
88 views

Computation of the moment of restoring forces for a floating vessel

Some slides associated to the book Handbook of Marine Craft Hydrodynamics and Motion Control (2021 edition) are provided by the author of the book here. At page 12 of the slides for Chapter 4, the ...
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2 votes
0 answers
67 views

How to move a stuck 400m cargo ship? [closed]

I am definitely not the captain of the Evergreen what is currently stuck in the Suez Canal: https://www.google.com/search?q=Evergreen+Suez+Canal But from an engineering point of view, what would be ...
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3 votes
4 answers
919 views

Why one big cargo ship is more efficient than 10 or 100 smaller ships?

Given the fact that small container ships are easier to manufacture than big container ships.. then why is it considered better to build bigger ships instead of many smaller ships? And to see why ...
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1 vote
0 answers
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Maneuverability calculation of a catamaran ship with azimuth thruster?

In a competition about ship prototype performance, my team decided to make a small catamaran ship with azimuth thrusters. This competition was originally about speed contest but due to COVID-19 it was ...
2 votes
2 answers
664 views

Why are Chinese aircraft carriers conventionally powered? [closed]

China has nuclear-powered submarines, which means China is able to manufacture portable nuclear power-plants. Then, why is the latest Chinese aircraft carrier Shandong conventionally powered?
10 votes
5 answers
1k views

Can a riverboat tack upriver?

Note: This question originally appeared on the Physics site (see here) and was closed for being off-topic. Whoops! If ships at sea can tack in a zigzaggy pattern by converting backwards force from the ...
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2 votes
2 answers
226 views

Longtitudinal Centre of Gravity for Ship Cargo

I did a Civil Engineering course some years ago and this question from my textbook, I have found what seems impossible to get the correct answer of 46.2 m for. By putting this question up I am hoping ...
1 vote
1 answer
535 views

Auxiliary engines on cargo vessels, what types are used for what purpose?

On large cargo ships (dry bulk carriers, or tankers) there are main and auxiliary engines. Auxiliary engines can be internal or external combustion (generators vs boilers) and generate electricity to ...
2 votes
1 answer
2k views

What are the 'poles' off the side off this aircraft carrier's flight deck?

Looking at a model of the HMS Ark Royal I found myself intrigued by the prominent 'poles' lining the flight deck. Some investigation on Google reveals that they can apparently be lowered to lay ...
-1 votes
1 answer
75 views

Describe the replacement flow of water at the stern of a large ship

What is the flow path of water immediately at the stern of a large, deep draft ship (like a container ship 250+m long for example)? Does it fill in the area displaced by the hull from all sides ...
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1 vote
0 answers
181 views

How to find Ship Transverse Metacentic Height

I did a Civil Engineering course some years ago and from my textbook I had this question. I found that a very interesting question, but unfortunately I haven't been able to find a solution to this. I ...
1 vote
2 answers
617 views

Why not build container ships from plastic?

This may sound crazy but bear with me. I was thinking about why cargo ships are built from such heavy material as steel, while smaller boats are often made of plastics. I know cargo ships carry a lot ...
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2 votes
0 answers
80 views

Regarding the ITTC Guidelines for Ship CFD applications

I was reading through the ITTC – Recommended Procedures and Guidelines - Practical Guidelines for Ship CFD Applications (https://ittc.info/media/4196/75-03-02-03.pdf) document and this little thing ...
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1 vote
1 answer
1k views

Why don't modern warships still use cannons?

This question is about a technical aspect of naval warfare, and I think that this site is the closest fit. History would have been my next guess. In the TV show “The Last Ship” the protagonists have ...
1 vote
3 answers
504 views

Why are aircraft carriers so expensive to build? [closed]

The aircraft carrier USS Nimitz cost \$4.5bn. The cruise ship Allure of the Seas cost \$1.2bn. Why is the difference so huge?
user avatar
2 votes
2 answers
976 views

Thrust generated by a ship

While reading about airplane engines on the internet, it is common to find figures of their thrust, in kilo Newton. However, in the case of ships and naval vessels, when talking about the engine, the ...
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4 votes
0 answers
116 views

How does a cable-laying ship retrieve a partly-laid cable?

I was reading an article in the press this week about a project to lay an undersea cable across the Tasman Sea. The ship had had to return to port for repairs and return to complete the job later. ...
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9 votes
1 answer
841 views

What kind of ship is this?

I've recently been on Rügen and I have seen this: Does anybody have an idea what this is? (To give Google a chance: A ship with four "towers" made out of steel on it. They looks a bit like high-...
4 votes
1 answer
709 views

How to design a reinforced concrete ship keel?

I am building a small ship (or very large sailboat) that will have a concrete ballast at the base of the keel. I am looking to increase the weight of the concrete (lb/ft3), but I also want to maximize ...
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24 votes
2 answers
6k views

Why would you launch a large ship by dropping it sideways?

I'm referring to the process shown in this video: https://youtu.be/Quyr5R1Rbfw?t=20 Or this image from Wikipedia: In it, a large warship is launched into the water by essentially dropping it ...
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