an off-topic discussion, but I noticed a comment on the video that mentioned Jeff Head had passed. Is that the same @Jeff Head we have here?YouTuber Jive Turkey does his Sub Brief on the Yuan here. Its a cool summary if you want to know more about the class in half an hour but some details need to be pointed out.
Wuchang is not a "core" navy shipyard because of its location deep within China to hide it from the frontline. There are tons of shipyards made along the river Yangtze because it is an important waterway for China, and Wuchang started its business making river boats. It just so happens to be there because that's how the business started in 1934.
It's pronounced Yu-an and not like "yawn" here.
Jiangnan Shipyard did not start on that island. They started within what is now Shanghai suburbs, and moved out of their old location after the turn of the century to their current location.
Chinese wiki has 18 subs, not 15.
Song has three sail types. The first one and only one of its kind, has the stepped sail. The second, which accounted for the next four, has the straight sail but both the front root and the back root of the sail has a curve or web on it. The third, which accounted for the last nine subs, has the straight forward and back edge of the sail.
What he describes here as "039C" is most striking because its not the "039C" the Internet thinks with the A26 style sail. Rather he describes it as coming out in 2017 and lacking a spherical sensor seen in the 039B sail. This spherical sensor you cannot see unless you are looking down on the sub on top of the sail. He describes this submarine as possibly or speculatively using lithium ion batteries.
I think he missed that part while the earliest Yuans have the square cornered sails like the Kilo, the next Yuans soon after have curved corners on the sails but still have straight edges from the top to the root. Then finally what you see as the "039B" has the top corners even more curved, along with curved or webbed roots in the front and rear of the sail.
I do think that all the Yuans have been retrofitted to the "B" sail, mainly because the absence of recent pictures of subs with the earlier sail.
Also confirms that all 039A and AG has been converted from their flank sonars to the long linear frequency one.
If lithium batteries are used, I would guess it is lithium iron phosphate battery (LFP). It is safe and mature technology, and China has a big production capacity meaning experience. It is already about 170 WH/Kg today. Going for Li-ion is suicidal IMO."He describes this submarine as possibly or speculatively using lithium ion batteries"
I've read the same rumor here and there
The big question is that when we talk about lithium batteries we can be talking about batteries with a density of 200-260 watt hours / kilo (example: the batteries of Tesla cars) ...
Or on the other hand we may be talking about safer batteries suitable for a Submarine and about 100 Watt hours / kilo, which I suspect could be the case for the last three Japanese submarines or not, it is difficult to know; but the question of the safety or rather dangerousness of higher density Lithium batteries is a real problem in a submarine
But within two years, in 2023, there will be 200 Watt-hour/kg sodium batteries.
This is incredible, and could be a revolution in the diesel-electric submarine.
I don't know
The amazing thing about this story is that Captain Nemo's Submarine dreamed up by Jules Verne ... carried ...