PLAN Type 035/039/091/092 Submarine Thread

[delft]

Re: Cavitation

Further on cavitation:
It became a problem in naval architecture with the high speed torpedo boats of around 1900. Cavitation destroyed the tips of the propellers and sometimes the skin of the hull nearby. Later it also became a problem with other fast vessels and even while it not yet damaged the hull sailors with berths near the propellers couldn't sleep from the noise.
Submarines might be troubled when using their diesels but when dived and using there e-motors their was no chance of cavitation. When submarines started using snorkels it also became a problem in tactical situations. The snorkel was invented in the late thirties , one of the Dutch boats that escaped to England in May 1940 was equipped with one, but only when Germany started using them when attacking convoys in the North Atlantic with the use of snorkels did it become a problem. That is more than ten years before the appearance of nuclear powered boats.

 

[Blitzo]

Re: PLAN submarines Thread II

What do you mean? If you're talking about the hexagonal shape, it's just a sticker.... I'm not sure why anyone would even make a negative out of the picture. It's so cluttered to begin with.

 

[duncanidaho]

Re: PLAN submarines Thread II

What do you mean? If you're talking about the hexagonal shape, it's just a sticker.... I'm not sure why anyone would even make a negative out of the picture. It's so cluttered to begin with.

I think, he is talking about the notch on the frontline of the sail, just above the sail planes.

 

[drunkmunky]

Re: PLAN submarines Thread II

That's just another decal.

 

[asif iqbal]

Re: PLAN submarines Thread II

Very rarely do we see pics of submarine launches or construction pics wish we could see more of them

 

[duncanidaho]

Re: PLAN submarines Thread II

That's just another decal.

seems to be

 

[latenlazy]

Re: PLAN submarines Thread II

PLAN's budget is more than plenty to sustain 8 even 12 SSBNs going forward. China's defense spending is also relatively small at less than 2% of GDP. Even if they had under reported we're talking maybe 2.5 % at the most.

Compare that to the height of the cold war when USSR's defense spending was estimated to be over 25% of GDP though no one really knows since it was a closely guarded secret. No wonder they went bankrupt.

I think percentages speak less than hard numbers in this case. The USSR's GDP wasn't particularly big.

 

[kroko]

Re: PLAN submarines Thread II

I think percentages speak less than hard numbers in this case. The USSR's GDP wasn't particularly big.

Yes, it was. It is estimated that by late 80´s, they had betwen 35% to 50% of USA GDP, and spent 25% of that in the military. They built more than 2000 tanks a year. I remember reading in magazines that they had more tanks and SAM than the rest of the world combined.

Regarding submarines, they built around 5 nuclear submarines a year. Thats what someone in russia said years ago.

 

[latenlazy]

Re: PLAN submarines Thread II

Yes, it was. It is estimated that by late 80´s, they had betwen 35% to 50% of USA GDP, and spent 25% of that in the military. They built more than 2000 tanks a year. I remember reading in magazines that they had more tanks and SAM than the rest of the world combined.

Regarding submarines, they built around 5 nuclear submarines a year. Thats what someone in russia said years ago.

Hmmm, yeah I take it back. After actually crunching the numbers, that WAS a lot of money being spent on the military. That said, I think the spirit of my original point stands. We should probably be doing dollar for dollar comparisons (always inflation adjusted of course) as opposed percentage comparisons.

 

[asif iqbal]

Re: PLAN submarines Thread II

Old but still interesting, this technology must have been operational by now

China's CKX5680 Digitally Controlled 7-axis Contour Milling Machine

The Wuhan Heavy Industry Corp. just made a breakthrough in an 863 Project. This is the CKX5680 Digitally Controlled 7-axis Contour Milling machine. This is significant as it is specialised in building ship propellers, like this one, for aircraft carriers and submarines. It is much more precise than 5-axis machines.

Type 039 Song-class submarine with asymmetric seven-bladed skewed propeller to reduce