?Does a submarine shrink when it dives.?

Question

When a submarine dives does it shrink like a cartesian diver? I know what forces are involved but does the tensile strength and design prevent any shrinkage? Are the effects insignificant or are any changes measurable and have to be taken account of in the design?

Answer 1

yes they do shrink. they are designed so that this will not interfere with operations, but most of that info is classified. The changes are measurable. if you were to tie a line (clothesline-style) from side to side inside the ship, there will be a noticeable slack in the line when the ship reaches a certain depth.

Answer 2

Yes... and No!
Submarines are made of two hulls (at the minimum). They are both (usually) made of steel.
The inside one contains the crew, and the pressure inside is increased slightly as the sub goes deeper, but never above ~2Bars (1 atmosphere = 1 Bar ~= 1kg/cm²).
The outside hull receives the FULL pressure of the water. At -10m, 2bars (1 atmosphere + 10m of water = 2 bars). At -20, 3 bars. At -200m, 21 bars, at -500m, 51 bars etc...
At these kind of pressures, the hardest steel starts "crushing", and the hull (although elastic), "bends" inwards, like if you compress a balloon. But, because it is "elastic" (the elasticity of steel), when the sub goes back to the surface, it takes back its shape. So, well, yes, they shrink!
If going lower than the safety limit, however, it is permanently deformed! I have seen some subs seriously damaged after a deep dive...

Answer 3

not in the true sense as in shrinking a jumper in the wash no it does not .however my late dad (c.p.o./e.r.a. ) told my big bro that he showed new submariners the effects of pressure on the hull,by putting a length of string tight across the engine room.before they dived..as the sub went deeper the pressure on the hulls (inner and outer) would cause the string to sag .this was the result of pressure.so no subs don't shrink in the true sense..hope this helps ..this was in the late 50s early 60s.don't know about the modern sub..maybe a submariner out there can help..

Answer 4

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Answer 5

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Answer 6

Guadalcanal, just the name stirs emotion. Guadalcanal, the site of the first American amphibious counter-offensive against the Japanese in the Second World War. Guadalcanal, the then unheard of island where the Americans (along with the Australians at Kokoda in Papua New Guinea) destroyed the myth of Japanese invincibility in the Pacific. Guadalcanal, where the advancing Japanese war machine ground to a screeching halt! Of 36,000 Japanese troops to go ashore on what they came to call "Shih Shima" or "Death Island" only 13,000 were eventually evacuated. After Guadalcanal the Japanese made no more advances in the Pacific, period! Although the American Navy suffered what is considered to be their greatest ever 'blue water defeat' in the campaign for Guadalcanal, (in the Battle of Savo Island) they constantly thwarted the Japanese efforts to destroy Henderson Field (the airfield taken from the Japanese at the beginning of the campaign and the key to overall supremacy in the South Pacific) and re-supply their increasingly isolated troops fighting the US First Marine Division on that then god forsaken island. As Napoleon once remarked, "Between a battle lost and a battle won, the distance is immense, and there stand empires." While the US victory at Midway may have shut the door on the Japanese, it was the eventual American supremacy at Guadalcanal that firmly locked it. No matter which way you look at it, Guadalcanal was no less than a major tuning point in World War Two!

The conflict started started off with a classic case of 'losing' a crucial naval battle (the Battle of Savo Island, August 1942), but at the same time winning a decisive strategic victory by protecting the vital invasion transports lying off Guadalcanal and Tulagi. Overall there were seven major fleet battles (between the USN and the IJN) in less than four months that made up the greater naval campaign for Guadalcanal. In chronological order they were; The Battle of Savo Island, The Battle of the Eastern Solomon's, The Battle of Cape Esperance, the Battle of Santa Cruz, The First (naval) Battle of Guadalcanal, The Second (naval) Battle of Guadalcanal and the Battle of Tassafaronga. Overall these battles contributed to an incredible loss of life and ships on both sides!

On the night of 12th/13th November 1942, (in what was to become known as the First Battle of Guadalcanal) the USS Atlanta was heading a cruiser column behind a van of destroyers patrolling off Guadalcanal over what was soon to become known as 'Iron Bottom Sound'. At about 2am the Atlanta fired what is believed to have been the very first shots at the advancing Japanese column. Under the command of Vice Admiral Hiroake Abe aboard the battleship Hiei, the column had just made an high speed run towards Guadalcanal from an earlier fleet rendezvous off the northern Shortland Islands near Bouganville. The USS Atlanta was also the flagship of Rear Admiral Norman Scott, and as the two antagonists met she was caught in the glare of Japanese searchlights, to which she promptly replied with a salvo of five inch shells from her main guns. This was immediately returned by a withering hail of fire from Japanese gunners.

Answer 7

eh? way over my head that one.

Answer 8

What is skycat on?

Answer 9

theoritically that's right.

Answer 10

yes, they do