Questions tagged [ships]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
3
votes
2answers
143 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
1answer
68 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 ...
2
votes
0answers
65 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 ...
2
votes
4answers
268 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 ...
1
vote
0answers
44 views

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 ...
3
votes
2answers
632 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
5answers
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 ...
2
votes
1answer
84 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
1answer
79 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
1answer
1k 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
1answer
57 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 ...
1
vote
0answers
126 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
2answers
273 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 ...
2
votes
0answers
58 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 ...
1
vote
1answer
736 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
3answers
345 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?
2
votes
2answers
619 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 ...
4
votes
0answers
110 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. ...
9
votes
1answer
824 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
1answer
635 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 ...
24
votes
2answers
5k 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 ...