Japan Military News, Reports, Data, etc.

Re: JMSDF Akizuki Class DDG (19DD AEGIS-like)

Jura said:

it seems the 25DD, "successor" of 19DD, will have the radar arrays just on the main mast (and not four of them foreship and the other four atop the hangar as on 19DD);

I saw it in the document: Key Figures from the MoD FY2013 Budget Request by James Simpson on Sep 7, 2012

the caption: The proposed new class, 25DD, is reportedly an improvement of the 19DD-class

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Well, I would say the picture is either not showing the other APARs on the back of the main mast, or it is incomplete. They will need the other APARs facing in those other direction to give a full 3D space coverage.


As it stands, like the Takanami was an improvement over the Murasami, the 25DDH looks vey much like the 19DDH with probably just some improvements. Almost like a Flight II Akizuki. The problem with this, even though the 25DD in that pictures looks a lot like the same hull form as the 19DD, they are stating it is a 5,000 ton displacement, which is significantly smaller than the 19DD, Akizuki. I believe that either that figure of 5,000 tons is off, or the picture is not a final representation of the vessel at this point.

Re: JMSDF Akizuki Class DDG (19DD AEGIS-like)

Hi!
1. Well, on the 19DD in order to protect the FCS-3A radar its antennas are installed (in pairs) foreship and in the stern, BUT if the foremast was taken out together with one pair of radars (hit by a "light" anti-ship missile, let's say), then please tell me what would the other pair be good for ...
2. As for the 25DD and its schematic picture, I found some description entering "25dd" into google.jp but don't know any Japanese :-(

Re: JMSDF Akizuki Class DDG (19DD AEGIS-like)

Jura said:

BUT if the foremast was taken out together with one pair of radars (hit by a "light" anti-ship missile, let's say), then please tell me what would the other pair be good for ...

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Battle damage is apt to occur in war. The systems are usually designed to try and isolate the various subsystems from one another so that taking down one does not effect the others.

This effort can be undone depending on the amount of battle damage.

So, if one pair of those sensors was taken out, the desired result based on their isolating them electornically and physically, would be for the other three locations to continue working and for the ship to continue having that level of coverage.

In this regard, actually the 19DD is a very good design because the forwad and aft facing sensors are seperated by a long distance physically so a hit to one area is not likely to damage the other.

Clearly, those PARs are not redundant (ie. they do not have two sets in different places facing the same direction), but power systems can be redundant (another reason for multiple engine rooms) so if the electricity (power) can be maintained, and if the damage is not too extensive, then the ship can continue to fight with the sensors that are operating.

If that happened, then a wise captain would compensate by ensuring that his remaining sensors were always facing the major threat axis, and would use either other ships, or aircraft to comepnsate with their sensors for what he had lost. This is where cooperatvie engagement capabilities through data links comes in very handy too.

Re: JMSDF Akizuki Class DDG (19DD AEGIS-like)

Jeff: Thanks for the answer to my previous post! I missed a ship could turn

Re: JMSDF Akizuki Class DDG (19DD AEGIS-like)

Jura said:

Jeff: Thanks for the answer to my previous post! I missed a ship could turn

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No problem, you are welcome.

It will be intereting to see what the 26DD actuially turns out to be.

I am also interested in the proposed (but as yet not approved) 26DDH aircraft carrier they are proposing. it looks like one htat is going to be purpose built for fixed wing aircraft if they fund it.

Re: JMSDF Akizuki Class DDG (19DD AEGIS-like)

Hi, I'd like to ask by how much the performance (in terms of the range and resolution) would be reduced if one (two; three) of the four octagonal-shaped panels of a multifunction radar were shut down; I'm sorry if this is a FAQ, thanks!

johnboy said:

The larger and much more important point is what will the Japanese build after the Hyugas?

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Now we know...they just launched the first Hyuga follow-on.

JS Izumo, DDH-183 (1st 22DDH) Launch video:


Big ship, and here's some nice pics of the launch which I took from the video.

I've toured my usual round of military forums and everyone is talking about this ship, it's beautiful.

Now starting a google search with japanese keywords to see if there are nice pics around

paintgun said:

I've toured my usual round of military forums and everyone is talking about this ship, it's beautiful.

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To get a better feel for just how big the new 22DDH, Izumo, DDH-183, really is, I thought I would compare it directly to the Wasp Class LHD of the US Navy. So, here is a port side view of the USS Bataan, LHD-5, the fifth US Navy Wasp Class, and from the same perspective on the port side, the view of the newly launched JMSDF Izumo, DDH-183.

The Wasp is 30 feet longer, it is about 10 feet taller, but it's beam is actually 3-4 feet less, although it's flight deck is a good 15-20 feet wider.


As you can see, the new Japanese vessel is a very large ship. Even at 30,000 tons full load, which is 3,000 tons larger than they admit to, I believe if fully outfitted with aircraft and fuel, it will be closer to 35,000 tons.

Nice comparison Jeff. Do you know the dimensions of the Hangar deck? Thanks!