Questions tagged [naval-engineering]

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2answers
35 views

What is up with the spaced rudders on the SMX-31/Barracuda?

You can see it in the video here for the Barracuda: https://youtu.be/_NZKyvQVRd0?t=124 And here's a pic of the SMX-31: http://www.hisutton.com/images/Fr_SMX-31_cutaway.jpg What are the advantages ...
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1answer
23 views

How are circular portholes mapped onto cylindrical hulls?

When portholes are put into a cylindrical hull, such as of a submarine or an airplane fuselage, is the glass window curved to match the curvature of the cylinder? And if so, is the porthole wrapped ...
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2answers
220 views

How can I calculate the buoyant force on an object without knowing in advance the amount of water displaced?

Suppose I know the mass and volume of an object, as well as its exact shape and density distribution as a function of space (x,y,z). Without submerging it to determine the amount of water displaced, ...
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3answers
2k views

X and Cross-from rudders in underwater control

What are the advantages of using X-form rudders in comparsion to Cross-form rudders? Why some submarines, torpedos and underwater autonomous vehicles use X-stern control? X-stern picture Cross-form
2
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1answer
90 views

Name of a keel between the bilge keel and the main keel

I'm working on a seaplane and find myself doubting about the specific nautical term for a keel placed between the bilge keel and the main keel. This might be a bit academic in nature since I have a ...
2
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1answer
271 views

Hydrofoil for skeg-hung rudder with forward centre-of-effort

I am trying to see how much I can reduce the torque on a rudder post by changing the foil shape. I think I need a rudder with a centre-of-effort further ahead than average but I don't know what rudder ...
1
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1answer
89 views

Would a Flettner rotor make sense for an ocean cruising trawler?

A Flettner rotor can be used to provide propulsion for ship from the wind. Would it make sense to fit a Flettner rotor to a full displacement expedition trawler in the 55-70 foot class like a ...
1
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1answer
480 views

Do submarines really have cranks for closing leaks?

It's common in submarine movies that when suffering some kind of shock (like a near miss by a torpedo or falling deep into a trench), water will start bursting into the cabin and the crew will run ...
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2answers
133 views

Do ships powered by nuclear reactors use water for shielding?

On a different Stack, I encountered an answer that was making a comparison to nuclear powered naval ships. It was stated that the physical shielding being used was various kinds of metals. This seems.....
22
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2answers
4k 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 ...