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Author Topic: Ohio Replacement Submarine  (Read 22095 times)

Offline Triton

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Ohio Replacement Submarine
« on: December 20, 2013, 09:26:14 pm »
Artist's impression of Ohio Replacement Submarine (formerly the SSBN-X Future Follow-on Submarine) released on Sept. 6, 2012.

Ohio Replacement submarine details November 1, 2012.

Source:
http://www.navsea.navy.mil/HomePagePictures/Forms/DispForm.aspx?ID=131
http://news.usni.org/2012/11/01/ohio-class-replacement-details
« Last Edit: December 20, 2013, 09:31:50 pm by Triton »

Offline F-14D

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Re: Ohio Replacement Submarine
« Reply #1 on: December 20, 2013, 10:22:50 pm »
...and here's an artist's impression of UK's follow-on to the Vanguard SSBNs, to be devloped in parallel. 

Source:http://news.usni.org/2013/12/18/u-k-mod-releases-first-images-royal-navys-new-boomers

Offline Triton

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Re: Ohio Replacement Submarine
« Reply #2 on: December 21, 2013, 11:57:07 am »
Workers stand pose for a photo in the four-tube “quad-pack”. (U.S. Navy photo courtesy of General Dynamics Electric Boat/Released)

Source:
http://science.dodlive.mil/2012/10/10/the-next-generation-in-submarines/

Offline Triton

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« Last Edit: December 21, 2013, 12:41:02 pm by Triton »

Offline Brickmuppet

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Re: Ohio Replacement Submarine
« Reply #4 on: December 21, 2013, 12:44:56 pm »
What is the point of the "quad-pack"? In surface vessels it means four smaller missiles (like ESSM or the abortive POLAR) could be fitted in a standard launch tube. I thought perhaps they were looking at something a few inches shorter and narrower than the cancelled Midgetman for 64 non-MIRVed missiles. However, Triton's pic shows the quad pack consists of 4 full sized tubes...is this a swappable module or what?

Offline TomS

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Re: Ohio Replacement Submarine
« Reply #5 on: December 21, 2013, 01:10:28 pm »
Not swappable, exactly, but mass producable.  Building the missile compartment separately and then dropping it into the sub is a lot easier than building it in place.  Quad tubes because that fits both USN and RN plans. The RN replacement SSBN will have either 8 or 12 tubes (sources vary); the USN wants 16 tubes  By designing a 4-tube module, you can put 2 or 3 in the British boats and 4 in the US subs.

Offline NilsD

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Re: Ohio Replacement Submarine
« Reply #6 on: December 21, 2013, 04:24:54 pm »
Why is the replacement design significantly larger than Ohio while having only 2/3 the missile complement?

Offline Triton

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Re: Ohio Replacement Submarine
« Reply #7 on: December 21, 2013, 05:30:01 pm »

Offline Triton

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Re: Ohio Replacement Submarine
« Reply #8 on: December 21, 2013, 05:31:06 pm »

Offline sferrin

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Re: Ohio Replacement Submarine
« Reply #9 on: December 21, 2013, 06:43:37 pm »
Why is the replacement design significantly larger than Ohio while having only 2/3 the missile complement?

Strange that way.  Supposedly the UK's Vanguard replacement will also be larger than it's predecessor.  Then there's the Russian Borei at 24,000 tons with 16 missiles.   
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Offline Rhinocrates

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Re: Ohio Replacement Submarine
« Reply #10 on: December 21, 2013, 08:00:26 pm »
Crew accommodations and facilities perhaps, which would help endurance?  The Astute class are the RN's first to dispense with hot bunking, which would increase volume - they are significantly larger than the Trafalgars.  The enormous Typhoons even have swimming pools.

Maybe some future-proofing...
« Last Edit: December 21, 2013, 08:02:08 pm by Rhinocrates »
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Offline TomS

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Re: Ohio Replacement Submarine
« Reply #11 on: December 21, 2013, 08:06:46 pm »
Electric drive can be bulky.  Also, many measures to improve quieting require volume inside the pressure hull.

As noted, improved crew accommodations also seem likely.

Offline markfward

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Re: Ohio Replacement Submarine
« Reply #12 on: December 21, 2013, 09:43:13 pm »
Not putting up with hot-bunks, accepting mixed sex crews, etc.


The New Navy costs money, don't you know.


Nothings' for free.




Offline RP1

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Re: Ohio Replacement Submarine
« Reply #13 on: December 22, 2013, 03:49:01 am »
Hi,


If I'm interpreting the "quad-pack" properly, it's to ease production issues - the integration of large diameter hull penetrations is always problematic and the missile tubes particularly. I think they used a lot of forged components but this new concept is supposed to make the structural integration a lot easier. [EDIT: Which TomS basically covered.]


Regarding hull size, remember that in the RN no small part of the growth from T- to A-boat was an increase in the diameter of the reactor compartment. Given what remained in the redacted documents released regarding successor it seems likely that PWR-3 will see a further increase in hull diameter to improve safety.


Of course, submarines have more that one dimension, so things like improved accommodation will increase volume, but sometimes that can be "filling in" space that has become available for other reasons. No matter how large they get, they're always the same density overall...


RP1


PS: IIRC Typhoon doesn't have a swimming pool, only a sauna. Roughing it in the Red Banner Northern Fleet! :D
« Last Edit: December 22, 2013, 03:54:38 am by RP1 »
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Offline RP1

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Re: Ohio Replacement Submarine
« Reply #14 on: December 22, 2013, 07:44:36 am »
My mistake:


I thought it was really a plunge pool for the sauna, though ;-) I'd never seem moving images of it, only stills.


RP1


PS: My word there is a *lot* of room on those boats.
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Offline Triton

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Re: Ohio Replacement Submarine
« Reply #15 on: December 22, 2013, 11:37:36 am »
Is the reduction of missile tubes from 24 in the Ohio-class SSBN to 16 in the Ohio Replacement Submarine the result of the New START treaty between the United States and the Russian Federation? Is it possible to retrofit the Ohio Replacement Submarine with additional missile tubes if the New START treaty expires in 2021? Can this possibility explain the 20,810 long tons (submerged) displacement of the Ohio Replacement Submarine? Also what about the Type 096 (Tang- class) SSBN of the People's Liberation Army Navy that is expected to have 24 missile tubes?

Model of Type 096 (Tang- class) SSBN.

Source:
http://en.wikipedia.org/wiki/Type_096_submarine
« Last Edit: December 22, 2013, 11:43:53 am by Triton »

Offline bobbymike

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Re: Ohio Replacement Submarine
« Reply #16 on: December 22, 2013, 12:17:54 pm »
Is the reduction of missile tubes from 24 in the Ohio-class SSBN to 16 in the Ohio Replacement Submarine the result of the New START treaty between the United States and the Russian Federation? Is it possible to retrofit the Ohio Replacement Submarine with additional missile tubes if the New START treaty expires in 2021? Can this possibility explain the 20,810 long tons (submerged) displacement of the Ohio Replacement Submarine? Also what about the Type 096 (Tang- class) SSBN of the People's Liberation Army Navy that is expected to have 24 missile tubes?

Model of Type 096 (Tang- class) SSBN.

Source:
http://en.wikipedia.org/wiki/Type_096_submarine

Sorry to be slightly off topic but.............. As the first Ohio replacement (Neptune Class?) won't be built til after New Start expires which means the US has no desire to have any surge capability in place to deploy more missile tubes. My pessimistic prediction is that we will stop at about 5 SSBN(X)s, never replace our ICBM's nor ever build a new nuke warhead. We will reduce to 'minimum' deterrent levels of 300 or so warheads on those five subs with 80 missiles. Yes I am that pessimistic. 
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Offline GTX

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Re: Ohio Replacement Submarine
« Reply #17 on: December 22, 2013, 12:31:40 pm »
Yes I am that pessimistic.


Some may find this an optimistic scenario...

Offline sferrin

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Re: Ohio Replacement Submarine
« Reply #18 on: December 22, 2013, 12:44:32 pm »
Yes I am that pessimistic.


Some may find this an optimistic scenario...

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Offline Rhinocrates

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Re: Ohio Replacement Submarine
« Reply #19 on: December 22, 2013, 12:45:30 pm »


PS: My word there is a *lot* of room on those boats.

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Offline Triton

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Re: Ohio Replacement Submarine
« Reply #20 on: December 22, 2013, 07:47:08 pm »
Was the decision to use the UGM-133 Trident II with a Life Extension, also known as the Trident D5LE, in the Ohio Replacement Submarine and Successor principally a political decision? Should the United States Navy have developed a new SLBM for the Ohio Replacement Submarine?

Offline TomS

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Re: Ohio Replacement Submarine
« Reply #21 on: December 22, 2013, 07:55:51 pm »
I'd say it was primarily an economic decision -- no one wants to fund a clear sheet SLBM when there,s no pressing requirement for one.  The current missiles seem to have enough payload capacity for realistic future scenarios.

Offline Triton

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Re: Ohio Replacement Submarine
« Reply #22 on: February 03, 2015, 05:07:01 pm »
Navy Budgeting $10 Billion for Ohio Replacement Program Over Next Five Years
By: Sam LaGrone
February 3, 2015 4:58 PM • Updated: February 3, 2015 5:33 PM

Source:
http://news.usni.org/2015/02/03/%EF%BB%BFnavy-budgeting-10-billion-ohio-replacement-program-next-five-years


Quote
PENTAGON – Continued work on the Ohio replacement nuclear ballistic missile submarine (SSBN) will cost the U.S. Navy about $10 billion over the next five years as part of budgeting in the Navy’s Future Years Defense Plan (FYDP), a senior service budget official told reporters on Monday.

“This FYDP plan funds both the advanced procurement [for ORP] at about $5 billion and [research and development] of about $5 billion,” said Rear Adm. William Lescher, the Department of the Navy’s (DoN) deputy assistant secretary of the Navy for budget in a late afternoon briefing to reporters.

The total includes $1.4 billion in the Fiscal Year 2016 request in the Department of the Navy’s R&D budget line, according to the Navy’s budget documents.

Those funds – over five years – are split between a $3.18 billion budget line for the research and development for the development of the submarine, $1.8 billion for nuclear technology development and $5.66 billion for long lead items from the Navy’s shipbuilding account, according to Navy budget documents.

The single largest line item is an anticipated $2.77 billion shipbuilding expenditure in Fiscal Year 2019.

ORP – an estimated $100 billion program to replace the service’s 14 nuclear ballistic missile submarines (SSBN) – is the Navy’s number one priority and the service has raised concerns without additional relief, the new class of 12 boomers could take funds away from other shipbuilding programs in the service’s shipbuilding account (SCN).

“They will get built,” Lescher said.
“[But there’s] very much a concern the impact of the broader shipbuilding approach absent the relief that we think is required to do this.”

The Navy thinks it will need the relief to preserve the rest of the shipbuilding budget when the first ORP boomer starts construction in FY 2021.

“The new construction SCN averages about $15 billion per year and these boats per year – past the lead boat – will be about $10 billion per year. So it requires two-thirds of the SCN absent relief, Lescher said.
“The department’s strong view is when the construction cost with the first boat in ’21 – particularly when it gets to a boat every year from 2026 to 2035 – that additional topline relief is required. “

In 2013, the former Navy director of undersea warfare Rear Adm. Richard Breckenridge said the relief needed could be more than half the cost of the program.

“$60 billion over 15 years is what we need,” Breckenridge said before the House Armed Services Seapower and Projection Forces Subcommittee.

To that end, Congress has established a fund for a seabased nuclear deterrent but has yet to deposit any money in the account.

Programs in the Navy’s long-range outlook have already been affected by the anticipated costs of ORP.

An anticipated Flight IV of the Arleigh Burke-class destroyer (DDG-51) – that would have replaced the Ticonderoga-class cruiser’s (CG-47) air defense commander role – was deemed unaffordable during the Ohio replacement period.

The class of 12 ORP boats will displace more than 20,000-tons and be the largest submarines the U.S. has ever constructed. The boomers will each field 16 Trident II D5 submarine launched ballistic missiles to replace the 14 existing Ohio-class boats.

Offline sferrin

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Re: Ohio Replacement Submarine
« Reply #23 on: February 03, 2015, 07:16:26 pm »
"The class of 12 ORP boats will displace more than 20,000-tons and be the largest submarines the U.S. has ever constructed. The boomers will each field 16 Trident II D5 submarine launched ballistic missiles to replace the 14 existing Ohio-class boats."

Cut the loadout by 50% and it's still bigger?  Huh?
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Offline bobbymike

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Re: Ohio Replacement Submarine
« Reply #24 on: February 03, 2015, 08:12:18 pm »
"The class of 12 ORP boats will displace more than 20,000-tons and be the largest submarines the U.S. has ever constructed. The boomers will each field 16 Trident II D5 submarine launched ballistic missiles to replace the 14 existing Ohio-class boats."

Cut the loadout by 50% and it's still bigger?  Huh?

33% but confusing to reduce the number of missile tubes when the current fleet of 14 w/24 missiles fits nicely with New START numbers. SSNBs would give you the easiest most effective warhead upload capability IMHO.

Does it need a larger reactor as it is supposed to last 44 years or the life of the boat without refueling? Would this be advanced silencing techniques?
« Last Edit: February 03, 2015, 10:53:57 pm by bobbymike »
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Offline Moose

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Re: Ohio Replacement Submarine
« Reply #25 on: February 03, 2015, 10:03:16 pm »
The electric drive is the single largest contributor to the extra size, but there are lots of things contributing to it. For example ORP will have a big upgrade in living conditions, with particular attention to accommodating mixed-gender crews, and that requires space.

Offline Triton

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Re: Ohio Replacement Submarine
« Reply #26 on: February 03, 2015, 10:16:25 pm »
Will there also be an SSGN replacement?

Offline bobbymike

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Re: Ohio Replacement Submarine
« Reply #27 on: February 03, 2015, 11:01:22 pm »
Will there also be an SSGN replacement?

Don't think so I read somewhere future Virginias will carry many more SLCM than the one's today in the VPMs and the entire fleet of Virginia's will 'match' the current SSGN's (I put match in quotes to suspend my disbelief this will happen).

http://news.usni.org/2013/11/04/navy-selects-virginia-payload-module-design-concept
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Offline covert_shores

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Re: Ohio Replacement Submarine
« Reply #28 on: February 04, 2015, 01:55:15 am »
The electric drive is the single largest contributor to the extra size, but there are lots of things contributing to it. For example ORP will have a big upgrade in living conditions, with particular attention to accommodating mixed-gender crews, and that requires space.
interesting.

I thought that electric drive (in the context of nuclear boats) would be more compact since it's what's used in small nuclear subs which cannot fit a steam plant, e.g. Losharik, NR-1...
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Offline PaulMM (Overscan)

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Re: Ohio Replacement Submarine
« Reply #29 on: February 05, 2015, 12:01:35 pm »
Removed a pointless digression on diversity in the Navy.
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Offline sferrin

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Re: Ohio Replacement Submarine
« Reply #30 on: February 05, 2015, 12:07:35 pm »
The electric drive is the single largest contributor to the extra size, but there are lots of things contributing to it. For example ORP will have a big upgrade in living conditions, with particular attention to accommodating mixed-gender crews, and that requires space.
interesting.

I thought that electric drive (in the context of nuclear boats) would be more compact since it's what's used in small nuclear subs which cannot fit a steam plant, e.g. Losharik, NR-1...

Compare the (nuclear, turbo-electric) Glenard P. Lipscomb SSN to it's nearest peer, the Sturgeon class.

https://en.wikipedia.org/wiki/USS_Glenard_P._Lipscomb_(SSN-685)
http://en.wikipedia.org/wiki/Sturgeon-class_submarine
« Last Edit: July 29, 2016, 10:36:49 am by sferrin »
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Offline Moose

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Re: Ohio Replacement Submarine
« Reply #31 on: February 05, 2015, 04:39:37 pm »
Interesting.

I thought that electric drive (in the context of nuclear boats) would be more compact since it's what's used in small nuclear subs which cannot fit a steam plant, e.g. Losharik, NR-1...
My reply got eaten by the above or by Comcast, sorry.


NR-1 was nuclear-electric because Rickover wanted her to be super-quiet and because it made it easier to power things like the maneuvering thrusters, floodlights, etc.


A Nuclear Electric submarine still has the steam plant, since direct conversion of fission heat to electricity on this scale is not practical at present. The essential difference between a Nuke and a Nuclear electric is that the mechanical drivetrain is replaced by an electrical one. The steam plant turns a big generator, and the propulsor is turned by a big electric motor. The generator and motor alone are quite large given the application, plus you have the various controllers, power cables, driveshafts, etc which all take up space. On top of all that you have the SUBSAFE culture within the Silent Service which tends to overbuild in order to minimize risk of things going wrong hundreds of feet underwater. A shaftless nuclear electric boat could shave off a chunk off that extra size+weight, but the Navy isn't ready to go there yet.

Offline Triton

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Re: Ohio Replacement Submarine
« Reply #32 on: July 29, 2016, 10:27:12 am »
Time to rename this topic to "Columbia-class SSBN"?

"Navy Ohio Replacement Sub Class to Be Named for D.C."
By: Sam LaGrone
July 28, 2016 8:30 PM • Updated: July 29, 2016 7:34 AM

Quote
The Navy’s new planned class of ballistic missile submarines will be named in honor of the District of Columbia, two Navy officials confirmed to USNI News on Thursday.

According to a notification memo to Congress obtained by USNI News, the first ship in the next planned class of Navy nuclear ballistic missile submarines (SSBN(X))– also known as the Ohio replacement program — will be named USS Columbia.

Secretary of the Navy Ray Mabus’ office is not releasing further information until the naming announcement, one Navy official told USNI News.

While the name Columbia for a U.S. ships and aircraft is not new – at least eight U.S. ships, a Space Shuttle and the Apollo 11 command module have all shared the name – it will be the first time the name has been used to commemorate the U.S. capital, the sources told USNI News.

The fleet’s current USS Columbia (SSN-771) – a Los Angeles attack submarine – is named in honor of Columbia, S.C., Columbia, Ill and Columbia, Mo. The submarine is expected to decommission before the first SSBN(X) enters service.

Other ships in the fleet were named after the romantic female personification of the Americas – Columbia.

The Columbia-class is set to replace the current crop of 14 Ohio-class boomers starting with the first acquisition of Columbia in Fiscal Year 2021.

“The Navy’s proposed FY2017 budget requests $773.1 million in advance procurement (AP) funding and $1,091.1 million in research and development funding for the Ohio replacement program,” according to a May Congressional Research Service report.

The new boomers will feature a new life-of-boat reactor, an electric drive and field 16 Trident II D5 ballistic nuclear missiles as one leg of the U.S. strategic nuclear deterrent triad.

According to early estimates, the 12 boat class will cost the Navy about $100 billion and is the service’s number one acquisition priority, a claim Navy leadership has repeated often.

Offline Triton

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Re: Ohio Replacement Submarine
« Reply #33 on: July 29, 2016, 10:33:49 am »
U.S.S. Columbia (SSBN-822)? The next available number after Block VII of the Virginia-class is 822. With 48 Virginia-class submarines planned, will all members of the Columbia-class be named for United States territories?
« Last Edit: July 29, 2016, 11:08:10 am by Triton »

Offline Moose

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Re: Ohio Replacement Submarine
« Reply #34 on: July 29, 2016, 10:34:54 pm »
Technically the Navy can go a couple routes with the hull numbers, so we just have to wait and see there. As for naming, it's highly unlikely the entire class would be named for territories. For one, there are only 16 territories, only 5 with permanent population. It seems very unlikely that the Navy would name SSBNs after uninhabited territory, for a number of reasons.

For two, Guam and Puerto Rico already have Sealift ships named for them. While not impossible to rename ships or declare a name will be reused while it's still currently in use, it's somewhat unusual.

l'll also point out that DC is not a territory, it's the Federal District. Whether this is a nod to the DC statehood movement or just a nod to the citizens who live and work in DC, I couldn't say. But it's a fine name, to my eyes.
« Last Edit: July 30, 2016, 02:22:09 pm by Moose »

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Re: Ohio Replacement Submarine
« Reply #35 on: August 01, 2016, 03:56:28 am »
Looking outside the park here, you could use COLUMBIA as a jumping-off point for a class named after American virtues and symbols. CONGRESS and PRESIDENT have precedence, maybe slip a REPUBLIC in there. If they weren't already taken, CONSTITUTION, FREEDOM, LIBERTY, and INDEPENDENCE would fit in perfectly.

The scheme gives good names, avoids the political game playing that's bound to result in the USS JAMES BUCHANAN one of these days, and should be completely uncontroversial. I fail to see the downside....

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Re: Ohio Replacement Submarine
« Reply #36 on: August 01, 2016, 04:16:36 am »
.

Well  ::)  why not get corporations to "sponsor" them ?

Columbia, could be sponsor by Columbia Records.

OBVIOUSLY, we could have USS Walmark, USS ExxonMobile, USS Apple, USS Microsoft, USS Google, USS Amazon, etc.......

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Re: Ohio Replacement Submarine
« Reply #41 on: December 14, 2016, 10:59:07 pm »
That rendering appears to show 16 missile tubes. Does the life-of-ship reactor that this new boat class sports contribute to the increased size?

As for naming, why not restart the convention of naming attack submarines after underwater creatures? State names for boomers seem fine, and frankly I'm getting quite tired of seeing vessels named after politicians.
« Last Edit: December 14, 2016, 11:07:31 pm by Steven »
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Re: Ohio Replacement Submarine
« Reply #42 on: December 15, 2016, 07:22:59 am »
That rendering appears to show 16 missile tubes. Does the life-of-ship reactor that this new boat class sports contribute to the increased size?

As for naming, why not restart the convention of naming attack submarines after underwater creatures? State names for boomers seem fine, and frankly I'm getting quite tired of seeing vessels named after politicians.
The reactor and the electric drive contribute a lot of mass and volume, plus there's the regular generational growth contributed by improvements in the crew accommodations and quieting.

Offline marauder2048

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Re: Ohio Replacement Submarine
« Reply #43 on: December 15, 2016, 03:41:26 pm »
That rendering appears to show 16 missile tubes. Does the life-of-ship reactor that this new boat class sports contribute to the increased size?

As for naming, why not restart the convention of naming attack submarines after underwater creatures? State names for boomers seem fine, and frankly I'm getting quite tired of seeing vessels named after politicians.
The reactor and the electric drive contribute a lot of mass and volume, plus there's the regular generational growth contributed by improvements in the crew accommodations and quieting.

My impression was that by going to a larger beam (43 ft. vs. 42. ft) they could potentially accommodate a longer
SLBM in the future e.g. they could replace the through-deck third stage motor with a longer first or second stage
motor.

Offline NeilChapman

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Re: Ohio Replacement Submarine
« Reply #44 on: January 07, 2017, 02:06:46 pm »
That rendering appears to show 16 missile tubes. Does the life-of-ship reactor that this new boat class sports contribute to the increased size?

As for naming, why not restart the convention of naming attack submarines after underwater creatures? State names for boomers seem fine, and frankly I'm getting quite tired of seeing vessels named after politicians.
The reactor and the electric drive contribute a lot of mass and volume, plus there's the regular generational growth contributed by improvements in the crew accommodations and quieting.

Well, the Ford-Class reactors are reportedly smaller, weigh less and require 2/3 the maintenance than Nimitz-Class while electrical power generation is 3x larger.  Expect the Columbia-Class reactor to have many efficiencies over predecessor besides service - to include size.  Recall Virginia-Class reactors are life-of-the-boat @ 33 yrs.   

Interesting article.  Indicates drive is actually smaller...

http://www.public.navy.mil/subfor/underseawarfaremagazine/Issues/Archives/issue_09/power_system.html

"As I mentioned earlier, with mechanical drive 75-80 percent of the useful power produced by the reactor is available exclusively for propulsion. An integrated electric power system, on the other hand, puts power on a common electrical bus and gives the commanding officer operational flexibility in how this energy is distributed to suit the range of payloads, sensors, and propulsion needs for a given tactical situation. An integrated electric power system will allow tomorrow's submarines to make greater use of rechargeable off-hull vehicles, payloads, and sensors to extend the submarines' tactical reach and safeguard operations in high risk and restricted areas."

Emphasis above mine.  What might be integrated into all that space.  All I can find are references to "performance - survivability and acoustics". 

http://nationalinterest.org/feature/beyond-the-ohio-class-inside-americas-next-generation-16270?page=show

"While there have been rumors  that the ORP is larger than its Ohio predecessors because of the size of the electric drive and its permanent magnet motor—despite carrying eight fewer missiles—Lennon said that is not true. The ORP will be larger than the Ohio-class because of the enhanced survivability measures integrated onboard the submarines—the new boats will displace more than 20,800-tons. Indeed, the Navy could have opted to build the boat with twenty or twenty-four missile tubes, but chose not to in order to make sure the United States dispersed its nuclear deterrence. “If you look at the overall length of the ship, the length of the missile compartment is smaller,” Lennon said. “But it’s distributed pretty much equally—the increase—forward and aft. Very little of that has to do with electric drive. It’s really to do with the other capabilities we’ve had to put into the ship in order to meet the mission needs.”

While he could not go into detail, Lennon said those mission needs include performance—including survivability and acoustics. “We’ve had to designate larger volumes in order to put certain features and capabilities into the ship,” he said."

On another note...

UK Dreadnought is also larger then its predecessor and it too has less tubes.  Interesting to note that US/UK shared reactor tech but US reactor has 42 year life and UK is 30 years.






Offline RLBH

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Re: Ohio Replacement Submarine
« Reply #45 on: January 09, 2017, 02:07:01 am »
Interesting to note that US/UK shared reactor tech but US reactor has 42 year life and UK is 30 years.
Design decision based on industrial considerations. UK submarine lifespan, fleet size and build rate are all tied together; we're at minimum fleet size and minimum build rate, which defines the life of the boat. A 42-year core would require a 40% increase in the size of the fleet or the yard standing idle for 12 years out of 42 - funding the former is politically unlikely, the second disastrous for the submarine industry.

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Offline NeilChapman

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Re: Ohio Replacement Submarine
« Reply #48 on: August 09, 2018, 06:37:38 pm »
cross post...

https://news.usni.org/2018/08/08/35632

"General Dynamics Electric Boat and the Navy are evaluating the potential of missile tube welding issues identified by a subcontractor to delay construction of the first Columbia-class submarines, the next block of Virginia-class submarines and for the British Dreadnought-class submarines."


**  Edit: Fixed problem link  **
« Last Edit: August 10, 2018, 05:54:31 am by NeilChapman »

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