World's Best Attack Submarines!

[SlyPokerDog]

 

[BrianFromWA]

If money was no object, this isn't a discussion and the Seawolfs (Seawolves?) laugh at your Virginias.

Since it is, Virginias are pretty nice.

 

[SlyPokerDog]

If money was no object, this isn't a discussion and the Seawolfs (Seawolves?) laugh at your Virginias.

Since it is, Virginias are pretty nice.

Clearly the North Korean sub is the best.

 

[SlyPokerDog]

If money was no object, this isn't a discussion and the Seawolfs (Seawolves?) laugh at your Virginias.

Since it is, Virginias are pretty nice.

Oh, you might not have seen this link - View the entire album, 18 images total (8 remaining).

 

[PDXFonz]

Clearly the North Korean sub is the best.

That shit is probably just a boat on the bottom

 

[SlyPokerDog]

That shit is probably just a boat on the bottom

North Korea is best Korea. Their sub is best sub. Don't hate.

 

[barfo]

If money was no object, this isn't a discussion and the Seawolfs (Seawolves?) laugh at your Virginias.

Ah, comparison of penis-shaped objects...

barfo

 

[Charcoal Filtered]

Would love to go back for a few weeks onboard a Seawolf. I would have interest in riding the North Korean sub but want to live to see my kids.

 

[PDXFonz]

So are there actually still minefields in most of the oceans? How come you never hear about a submarine blowing up in a minefield? Or even about the minefields themselves for that matter?

Or do you, and I'm just out of the loop?

Maybe it's just not mine field of expertise.

 

[BrianFromWA]

Clearly the North Korean sub is the best.

I especially enjoy the rust-colored camouflage paint all along the waterline. Truly deceptive. It's like they WANT you to think that the boat's a piece of $#...

 

[jlprk]

In 1962-63 I lived on the Pearl Harbor Channel and took a picture of every large ship passing through. I've told the story here of how I waded in illegally once. I haven't seen the photos for about 30 years, but they're around here somewhere. Probably still classified info. Usually the crews would stand at attention in formation in dress whites. The Kitty Hawk was the largest boat in the Pacific.

I used to ask everyone what the giant tank on top of some submarines was. Theories were, a tank of fuel or provisions, nuclear torpedo or missile, radar, spool of cable for mines or comm, mini-sub, etc. Many years later, diagrams like this captioned them as mini-subs. They're more streamlined now. They used to look like rounded blimps, not fit for underwater travel. Some were almost spherical. Hmm. I still wonder...they could have been anything.

 

[MarAzul]

Funny they just call that a duct around the propeller. Looks like a Kort Nozzle to me or perhaps a Rice Speed nozzle.

 

[BrianFromWA]

The "duct" is a Kort nozzle. It's not (as sometimes postulated) a "shroud".

 

[Denny Crane]

Some of those subs are nuclear. Prepare for a long and agonizing death!

 

[BrianFromWA]

I'll be the first to admit that I don't trust Chinese nuclear-powered boats to maintain all of the regulations that we do. As for the DPRK, they have enough trouble keeping diesel boats afloat.

 

[Denny Crane]

I'll be the first to admit that I don't trust Chinese nuclear-powered boats to maintain all of the regulations that we do. As for the DPRK, they have enough trouble keeping diesel boats afloat.

When the radiation hits the beach in Portland, there'll be one guy with a geiger counter and lots of heat about it.

 

[MarAzul]

The "duct" is a Kort nozzle. It's not (as sometimes postulated) a "shroud".

I am pretty sure you are correct.

 

[SlyPokerDog]

I am pretty sure you are correct.

No pretty sure about it, if BFW says it's a Kort nozzle I believe it.

 

[MarAzul]

No pretty sure about it, if BFW says it's a Kort nozzle I believe it.

If you say so dog.

A little surprising to see this on an attack sub, but I imagine it is there to enable
higher silent running speed. I doubt it facilitates any higher top speed and more bollard pull wouldn't be of much use, that I can think of.

 

[BrianFromWA]

That's just it...I'd expect a Rice Speed nozzle on a trawler or tug, not necessarily something that should never have to pull something bigger than a towed array cable.

I would also surmise that there are acoustic properties involved in the Kort nozzle...

 

[MarAzul]

Well I think there is. The nozzle is a foil section rapped around the prop. This will cause the water to begin to flow prior to meeting the prop. The higher velocity of the water will allow the sub to achieve that much more speed relative to the water meeting the prop before the noisy cavitation begins.

 

[DaLincolnJones]

Well I think there is. The nozzle is a foil section rapped around the prop. This will cause the water to begin to flow prior to meeting the prop. The higher velocity of the water will allow the sub to achieve that much more speed relative to the water meeting the prop before the noisy cavitation begins.

following this line, would it also be quieter at lower speeds as well?

 

[MarAzul]

following this line, would it also be quieter at lower speeds as well?

perhaps, but not all that much in noise reduction I shouldn't think. Although the bollard pull increase may well be useful at the lower speed towing what ever in currents found close in with shallow water.

 

[MarAzul]

Ah! Just thought. Cavitation will occur in shallow water at lower prop rpm than is deep water due to less water pressure in the shallows. This sub is designed to operate in the shallow and the Kort Nossle help keep it silent.