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another505

Junior Member
Registered Member
I am surprised that they plan to install NSM over an actual VLS. I suppose NSM is a lot smaller but it is so unnecessary as a frigate.

Now its a coastal monitor at best. Good for somali pirates. But not even good for Iranian or Yemen.

It would help relieve some minor duties off the Burkes but as many other said, its an even more overcost LCS
 

CMP

Captain
Registered Member
A lot of people on USNI forum say the Legend class was designed from the get go with space provisioned for a small VLS module and surplus power to accommodate more powerful weapon systems and sensors.

A future Flight II could end up close to HII Patrol Frigate 4921 design proposal.
Instead of trusting what they say, just observe what they ultimately do.
 

Lethe

Captain
Continuing recent discussion from 004 CVN thread re: Soviet influence on DDG-51 hull form.

One could do a lot worse than draw inspiration from Soviet hullforms. TsAGI was a world-class institution. DDG-51's hullform was inspired by study of Soviet combatant hullforms and USN will apparently be building those ships until the heat death of the universe, so PLAN is in good company here.

[.....]

From Norman Friedman's U.S. Destroyers, Revised Edition, page 421, regarding the development of DDG-51:

"The new destroyer incorporated a 'seakeeping' hull based on American observations of Soviet practice. Earlier U.S. destroyer hull forms had been intended primarily to achieve high speed in calm water, but after World War II many American officers noted unhappily that foreign ships, both allied and Soviet, seemed to do better in rough weather. The new hull form was inspired by U.S. Navy studies of Soviet warship design. It had a wide transom flared on the sides and a V- (rather than the usual U-) form forward. The ship had a wider waterplane forward, harder bilges, and the point at which the keel began to rise was farther aft than usual. Extensive flare put volume higher rather than lower. This combination moved the center of flotation aft while the center of gravity stayed forward as in more conventional hulls. It was attractive because so many U.S. officers had seen Soviet warships that seemed to be better seakeepers than their own ships. It was widely accepted that the more flared hull would be more survivable, since waterplane area would increase quickly as the ship sank into the water. An incidental virtue not widely noted at the time was that a flared hull would have a reduced radar signature, since its sides would not form corner reflectors where they met the water. The new hull form, which also reflected U.S. ideas current from the early 1960s, was put together by the David Taylor model basin (NSRDC, the Naval Ship Research and Development Center)."

Thanks for the quote, I was under impression that DDG-51 was a revised Spruance with modified bow for better seakeeping. USNI does not mention any Soviet influence in this design change though :)
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Some brief research turns up some interesting articles in Proceedings, such as
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, which appears to be derived from
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study published in Naval Engineers Journal by the same authors. Excerpt from the former:

For example, model tests have shown that a Soviet-style large-waterplane-area-type hull form provides better seakeeping than a typical U. S. Navy-style hull form [...] If U. S. frigates had been designed with a seakeeping-type hull form, similar to the one currently being considered for the new Arleigh Burke-class destroyer, and if they had fin stabilizers, their seakeeping and combat system performance would have been substantially improved.

At this point, it seems uncontroversial that DDG-51 hull form was refined in ways that resembled existing Soviet practice. The question is just how direct that relationship was. Was it a case of "blind" convergent evolution, or a more directed process that originated, at least in part, from U.S. observations of comparative seakeeping qualities of U.S. and Soviet combatants? There is some ambiguity in the language, but Friedman seems to be suggesting the latter, particularly with this line: "The new hull form was inspired by U.S. Navy studies of Soviet warship design."

In that context, the biographical notes for the authors of the above-linked Proceedings article are rather interesting, linking authors specialising in comparative analysis of U.S. and Soviet designs (J.W. Kehoe) with authors directly implicated in refining DDG-51 hull form (E.N. Comstock). Chasing the reference list from the NEJ study may well prove rewarding.
 
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Broccoli

Senior Member
Speaking of which, Big Bun CG on Weibo made a comparison CG between the cancelled Constellation FFG and the planned Legend-mod FFL (the latter of which is based on illustrations released by SECNAV).

Certainly doesn't look like the Legend-mod FFL can be equipped with VLS cells in meaningful capacity, unless either the ship was lengthened, and/or the superstructure was heavily modified (which doesn't seem likely/possible).

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Legend is more like a really big OPV rather than proper frigate.
 

daifo

Major
Registered Member
People are looking at the technical weapon loadout but might be missing the intent of these new ships. Being heavy on surface warfare, I think these ships could be use to blockade or threaten blockade of a certain country's ship in areas that are relatively safe for us naval ships. Think atlantic and eastern pacific.
 

SlothmanAllen

Senior Member
Registered Member
I’ve been wondering if “hulls in the water” is really the key phrase here?

I know a lot of people are focusing on armament, defensive systems, sensors, potential role, but what if the real point is to get a bunch of shipyards putting hulls in the water?

The US shipbuilding industry is really struggling, and maybe this is viewed as one way to expand producing capacity for future designs?

The Legend class is relatively cheap and provides a minimally viable product. The real goal may be to contract it out to several yards and have them each producing 2+ per year. Though not a large ship, the legend class is still several thousand tons.

Contracted out and stably produced over a couple blocks in large volume it could be a way to strengthen the shipbuilding industrial base as a whole?

The US shipbuilding industry may need to learn how to walk before it can run to a certain extent. The Constellation might be the right ship, but maybe it is too much of a gold plated design for the industry to handle in its current state.

Anyway, that is just my random speculation.
 
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