Whats at the aft deck?

[Bulkhead]

http://img217.imageshack.us/img217/8545/sh4img5112007141913203zn5.jpg

Hi, I am just wondering, does anyone knows what the two bumps on the aft deck is? This is a Sargo class for those who didnt know...:hmm:

[seafarer]

I think they are bulges to cover the mufflers. The Salmon class had something similar, and I know it was to cover larger wartime mufflers.

P.S.
Yup, mufflers - look at the 10th picture here (http://www.navsource.org/archives/08/08190.htm). The diesel mufflers were mounted on top of the pressure hull, under the outer hull casing (there's a pic at the linked site of one of the boats with exposed mufflers during a refit)

[Bulkhead]

Nice, thanks:)

I noticed that there were 4 of them at the pic, and in my pic from the game there is only two but they are longer.

Speaking diesel-exhaust: Is the closing valve-thing when diving in the same casing? is that the reason for the big size?

[mookiemookie]

I would imagine so as those holes in the side under the humps are the engine exhaust valves. If you want to read about a diesel boat engineman's recollections of what happened when the dive alarm was sounded, here it is: http://www.olgoat.com/substuff/mik35.htm

[seafarer]

Nice, thanks:)

I noticed that there were 4 of them at the pic, and in my pic from the game there is only two but they are longer.

Speaking diesel-exhaust: Is the closing valve-thing when diving in the same casing? is that the reason for the big size?

If you mean the main induction inlet, that opened up in the conning tower fairwater, aft end (induction pipe was about 16-inches in diameter). The induction valves were in the pressure hull, at the top of the engine rooms. The big 16" pipe was under the casing, snaking along the pressure hull and up into the fairwater, where it would be protected from spray and waves. Exhaust could be closer to the water line, since it was outgoing gases under pressure, and had backflow preventer valves to stop water from getting in.

P.S. you can see some idea of the induction piping in the first pic here (http://www.navsource.org/archives/08/08426.htm)

[Ducimus]

Just incase anyone was wondering, the little "doors" under the aft AA gun (aka cigertte deck as i recall) on conning towers, is where the main induction is.

[seafarer]

A picture (last one, bottom of page) of the exposed mufflers on the USS Plunger (http://www.rddesigns.com/subs/179.html). The big pipe running forward would actually be the induction pipe, running from the conning tower back to the pressure hull over each engine room.

[Bulkhead]

Ok, so if i got this right the mufflers itself was flooded. The pipe went all the way up to the conning tower and back to the aft deck where the end pipe was...?!