r/Warships

Opinion on the utility of super-cavitating underwater ammunition?

Opinion on the utility of super-cavitating underwater ammunition?

Image credit: Nammo

Relatively few options have been available especially defensively for underwater attacks on surface ships. Even if you say saw/heard a torpedo coming, you had best hoped you could outrun it as you had limited options to hitting it. With underwater and especially semi-submersible drones this could be a bigger issue than ever before

But maybe super-cavitating ammunition is a solution?

The USN already has one in service in the 30x173mm Mk 258 Mod 1 as seen in the graphic above, primarily in to my knowledge use for minesweeping, there’s theoretical usage even discussed by Nammo themselves which could include close range torpedo and submarine defense.

One of the big issues with this type of method would be that you would of course need to hit an underwater contact, which usually one doesn’t have a perfect position for. The other is that even the best performing projectiles can’t go that far underwater which would mean a pretty short ranged defense.

The bigger the projectile the longer ranged so if one had say a 5” (127mm) version it would have a massively higher effective underwater range and a meaningful explosive charge though you’d be giving up as good in-air performance.

But what do y’all think?

Could this be useful in a defensive role for surface ships? Or is it only good for mine clearing realistically?

u/JMHSrowing — 2 days ago

Navio de desembarque Dixmunde da marinha francesa no porto de Ponta Delgada, Açores.

u/jcnazza — 2 days ago

IJN Akagi Aircraft Carrier Plans

There was a request for some plans of the IJN Akagi - this is what I found in my files for you. Hopefully it's helpful!

NS

u/NavyShooter_NS — 3 days ago
▲ 53 r/Warships+3 crossposts

Looking for IJN Akagi hull lines / body plans

Hi everyone,

I am looking for the hull frames / body lines plan for the Japanese aircraft carrier Akagi, but I've hit a dead end with the usual sources.

Here is what I have already tried:

Miyukikai: They have completely stopped selling their drawings and have no plans to reopen.

Kagero (Super Drawings in 3D): I have the book, but it does not contain the complete hull lines

Yuzuru Hiraga Digital Archive: The original blueprints are either incomplete, too distorted, or difficult to properly align for an accurate reconstruction.

Does anyone happen to have scans of the old Miyukikai plans, or perhaps the hull lines from the out-of-print Polish A.J. Press monographs or Japanese Gakken books?

Any help or point in the right direction would be greatly appreciated. Thank you!

u/NetworkCharacter9800 — 5 days ago
▲ 70 r/Warships+1 crossposts

FF(X) Design Revisited (solution to the VLS cell placement)

The FF(X) Flight I is starting at basically a slightly up-gunned NSC Legend Class Coast Guard Cutter, with a towed sonar added in place of the boat launch. Flight II is based on a design put forth by HII in some of their promotional videos. Flights III and IV are based on a 48' modular hull plug added between the engine and bridge section of the hull. This plug gives the Frigate enough space to add Mrk 70 containers without compromising Helo operations or losing dual hangers. The final flight also incorporates upgrades to more powerful sensors. Like the F-18 hornet and super hornet design, flights III and IV may look similar on the outside but will be quite different underneath the skin, which by Flight IV will be at least level 2 survivable, if not level 3. The production of these ships will be based on the modular and multi-shipyard built, mandated by the current administration. So I pose this question: is this a path the FF(X) should undergo to max out the design and create a formidable warship?

u/Possible_Average_688 — 7 days ago

Cancellation of type 83 for CCV's

I am massively disappointed in this decision and the overall shrinking of the naval fleet. The Royal Navy and military budget in general, is collapsing in front of our eyes.

I wonder what form the common combat vessels will take. Will it be a large drone mothership or a command vessel, or potentially just a Type 26, with less emphasis on ASW and the mission bay converted into a drone control hub; to coordinate larger drones.

What are everyone's thoughts?

reddit.com
u/Haunting-Piano3370 — 8 days ago

Seeking literature on battleship armor schemes

Hello Sub,

I am currently working on a paper and I'm looking for detailed literature about the armor schemes of battleships. While you can find brief mentions of this in almost any non-fiction book on the subject, I am searching for information regarding the underlying design philosophies, the specific function of individual armor plates, and how impact and incidence angles play a role in design.

In short, I am looking for a work that goes really deep into the technical aspects of armor protection. Can anyone recommend anything?

German-language sources would be ideal, but English-language texts are also welcome.

reddit.com
u/Resqusto — 7 days ago
▲ 6 r/Warships+1 crossposts

Could a beehive, cargo, or cluster shell be useful in anti-submarine/UUV warfare in the modern era?

Navies are inherently needing to be as efficient as possible, especially in terms of weapon systems which are always not only expensive and heavy but also manpower and maintenance intensive. This does bring up the question; could the medium caliber guns of modern ships be made more useful in the modern era, maybe even in the underwater realm?

Source: NavWeaps

There already is a 127mm (5") cargo/cluster shell in existence as seen above, the submunitions are dual-purpose shaped charge type, so that they can penetrate an amount of armor. But it also makes them like a miniature Hedgehog launcher. Could, if the right fuzing, something like this not be used to engage at least fairly shallow underwater drones if not full sized modern submarines?

Source: fas.org

If not something like that, then for specifically more shallow water, smaller target work, then maybe beehive type round only with the difference using larger and super-cavitating sub-projectiles. This would be even cheaper, which could be quite useful in the world of drones while also being a bit less controversial in terms of use against other types of targets than a cluster shell. Potentially it's low time of flight and immediate usability could make it part of layered torpedo defense.

Any of these could at least be able to be greatly useful against surface targets as well and maybe some aerial targets with the right fuzing, but when it comes to underwater targets the question seems like it would be one of fire control. Naval guns while supremely accurate cannot shoot what can't be seen.

And, what not only is something I don't know but presume is classified, is if data to locate underwater targets precisely enough to shoot at them with a gun is feasible in the modern age. Underwater stealth has been seen as a key feature since the late second world war after all.

But what do you all think?

Could shells like this be useful in the underwater domain in the modern era, at least defensively if not offensively?

reddit.com
u/JMHSrowing — 8 days ago

Am I watching a Type 23 and a Type 45 enter Norfolk?

It’s just after 6AM on Sunday the 28th and I’m sitting in the balcony of my hotel in Virginia Beach ship watching. For the last half hour I’ve been following what I’m pretty sure are British Type 45 and Type 23 destroyers going northward and inbound to Norfolk. Unfortunately, my crappy cellphone camera can’t get a useful picture of them.

Anyone know if a British contingent is expected for the 4th/250th? Anyone reading this in the future happen to see them docked somewhere in the Chesapeake?

reddit.com
u/vonHindenburg — 8 days ago

What do you think is the optimal medium defensive gun caliber in the age of drones?

In the day and age of drones, not only kamikaze drones but also now large drones who can carry their own ordnance, it seems like cheap defensive guns of both the CIWS variety and those slightly less advanced are paramount. Few other options are as economical per target and yet can offer the needed range, as well as be mounted on nearly anything that floats.

But I think a serious question is what caliber to choose?

The 20mm and 25mm have long been naval staples, they allow for a very large magazine and high rates of fire. But they also seriously limit fuzing options and are limited in their effective range. On the flip side 25mm is the lower limit now for a proximity fuse round, and a rotary cannon shooting those would shred nearly anything.

30mm options are becoming more popular as there’s become more and better proximity and times airburst ammunition for them. Platforms still retain high rates of fire and magazine capacities after all.

The 40mm either in terms of BAE’s evolution of the famous Bofors or things like newer CTA RapidFIRE which the French are mounting on some ships. It offers far superior range and payload, though at way reduced rate of fire and ammunition capacity compared to smaller offerings.

Personally I think that the 35x228mm is probably a good middle ground. It has a much higher power than even 30mm options in terms of both payload and range while also in autocannons which have firing rates upto 1000rpm. Its shape with a relatively long projectile and a bottlenecked cartridge makes it more efficient in all regards than the old Bofors 40mm cartridges that are designed more like 19th century ammunition too.

But what do y’all think?

reddit.com
u/JMHSrowing — 11 days ago
▲ 9 r/Warships+1 crossposts

Future of the Eurocorvette (EPC/MMPC)

The project of the "Eurocorvette" - initially European Patrol Corvette (EPC), now Multi Modular Patrol Corvette (MMPC) - is a joint effort by a number of European nations, managed by OCCAR, as part of the Permanent Structured Cooperation (PESCO) initiative among EU member states:

The project started in 2019 and has drawn over $250m funding of the EU until 2029, plus over $150m expected to be contributed by national budgets. It aims to produce two prototype ships of up to 110m length and around 3,000 tons of displacement by 2030, in two configurations:

  • "Long Range Multipurpose" (LRM), which will have an OPV role (for France).
  • "Full Combat Multipurpose" (FCM), which will be a more heavily armed corvette (for Italy).

Like many multinational projects, the MMPC is progressing slowly, to the point of questioning its future.

What is the opinion of the community on the prospects of the project?

Could it, if it proceeds, lead to a commercially successful design, capable of producing a few dozen units until 2050?

reddit.com
u/PNS21 — 9 days ago