# Questions tagged [submarines]

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### Calculate the max speed at which a submarine rises/dives + acceleration

I'm trying to figure out how I would calculate the rate at which a submarine (or any object) ascends or descends in seawater given a certain buoyancy or change in buoyancy. For example, if my ...
49 views

### Calculate volume of compressed air tank given several variables

For context, I've started drafting an idea for a submarine simulator game, and I want to make as realistic as possible; but this obviously requires doing a lot of math that I'm unfamiliar with. I've ...
127 views

### Why does the Titan not descend attached to a surface-attached "leash"?

Wouldnt such a design prevent loss of contact?
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6k views

### What did all those valves do in a U-Boat?

I was visiting the Museum of Science and Industry in Chicago (highly recommended) and I took the tour of the complete U-Boat (U-505) that they have housed there. It's extremely well-preserved inside ...
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### Glide Ratio of an unpowered "sub"

Flying gliders can have glide ratios (ratio of horizontal distance vs vertical distance) around 50 or 60. How would that change when the fluid density changes, in particular under water. Could a ...
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### Calculate thickness of a 1 square meter window made of acrylic in a submarine to endure 100meters

This question would have two parts: 1 - How to calculate thickness of a 1 square meter window made of acrylic in a submarine to endure 100meters of deepness in salt water? I don't remember the ...
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346 views

### What are the factors determining position of forward dive planes on a submarine?

This question is restricted to nuclear submarines. The forward horizontal dive planes of nuclear submarines may be located either on the hull in front of the sail (as for seen in this cutaway of an ...
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### How do center of gravity varies in submarine between surface and submerged?

I'm interesting in static* roll stability of submarines. I'm always tempted to compare submerged submarine to blimps and other bigger airships. For airships, roll stability is assured by a pendulum ...
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1 vote
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### Is there a submarine that uses fewer than 4 rudders?

This question is restricted to post-WWII submarines designed to have a greater speed while submerged and to cruise underwater (unlike WWII U-boats). As highlighted in this question, there is no need ...
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510 views

### What is the optimal building material for a submarine pressure hull?

I have a difficult and interesting design project to work on and I am trying to get my hands on some ballpark figures from people who know engineering a little better. Help is appreciated! I am ...
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689 views

### Why did the Soviet Alfa-class submarines have a titanium hull?

My limited knowledge in engineering tells me: Titanium is expensive, stronger and heavier than aluminium, lighter and weaker than high yield steel. The most significant advantage of titanium is the ...
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### X-form and cross-form rudders in underwater control

What are the advantages of using X-form rudders in comparison to cross-form rudders? Why do some submarines, torpedos and underwater autonomous vehicles use X-stern control? X-stern: Cross-form:
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