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Originally Posted by Kapitan
First of all tear drop shape was pioneered by the K3 the first november class submarine, the K3 rendered the nautilus obsolete if you go by paper v paper side of things, it out classed nautilus it dived deeper was faster and carried more weapons and had alot more space inside.
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Kapitan that is a common miss understanding. You see there are two post Type XXI hull designs, the teardrop and the cigar. Teardrop designs are based on the USS Albacore while the Cigar is based on the November (which is derived from pre-WWI Holland boats). Here is a great photo where you can compare the differences.
That is an Alfa on the left and a November on the Right. See how the November is bullet shaped on the bow and uniform along the hull- that is a cigar shaped hull. The Alfa on the other hand is not uniform along the hull (for the most part) it is tapering from the fin to the ends of the hull.
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I only know of about 3 navies who maintain non tear drop hull submarines, egypt (romeo improved) china (romeo improved, golf II) tiawan (whiskey)
Note the world status of these countries.
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Taiwan dosn't have a Whiskey, I think you ment a Tench class GUPPY.
North Korea also has some Romeo/Mings kicking about.
Pakistan has a few Damphine' but they may have been retired by now.
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Originally Posted by msxyz
Noise in a hull generated by flowing water depends on the bow shape and from apertures in the flooded parts of the hull, both of which contributes to create vortexes. Classic WW2 submarines like the type VII or IX had myriads of slots in the outer skin to allow water passage and reduce diving time by quickly flooding the space below the deck and avoid bubbles of gas to be trapped between the skin and the hull. In a later type XXI (or in a similar post war submarine) the number of slots was reduced and their placement and shape became extremely important.
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Those are called "Limber Holes" even today submarines have them- especially Russian submarines although the Los Angles class has a few near VLS tubes. Today they have doors that close once the hull spaces are filled to reduce flow noise.