NationStates Jolt Archive

Any and all imput will be much appreciated. This is only the design phase and the initial design as you see below WILL be updated as time goes on and the design begins to take shape into what the actual Credonia Class SD will be. This is in no way shape or form the final version. Much needs to be added to the basic framework set forth here.

Credonia Class Super Dreadnought

Displacement
1,151,949 tons light; 1,184,095 tons standard; 1,276,915 tons normal; 1,351,171 tons full load

Dimensions
Length overall / water x beam x draught
2,011.95 ft / 1,998.00 ft x 324.42 ft x 102.45 ft (normal load)
613.24 m / 608.99 m x 98.88 m x 31.23 m

Armament
10 - 25.00" / 635 mm guns (6 mounts), 7,812.50lbs / 3,543.69kg shells
Breech loading guns in turrets (on barbettes)on centreline, evenly spread, 6 raised mounts

16 - 5.00" / 127 mm guns (8x2 guns), 62.50lbs / 28.35kg shells
Dual purpose guns in deck mounts with hoists on side, all amidships, 4 raised mounts - superfiring

20 - 1.10" / 27.9 mm guns (5x4 guns), 0.67lbs / 0.30kg shells
Anti-aircraft guns in deck mounts on side, all amidships, all raised mounts - superfiring

34 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells
Anti-aircraft guns in deck mounts on side, all amidships, all raised mounts - superfiring

8 - 10.00" / 254 mm guns in single mounts, 500.00lbs / 226.80kg shells
Muzzle loading guns in deck mounts on side, all amidships, all raised mounts - superfiring; Weight of broadside 83,147 lbs / 37,715 kg; Shells per gun, main battery: 142

30 - 25.0" / 635 mm submerged torpedo tubes

Armour
- Belts
Main : Width- 12.2"; Length- 379.63 ft; Height- 15.09 ft

Ends: Unarmoured

Main Belt covers 29 % of normal length

- Torpedo Bulkhead
Width- 4.00"; Length- 379.63 ft; Height- 24.54 ft

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: Face- 18.0"; Other gunhouse- 9.50"; Barbette/hoist-17.3" / 439 mm

2nd: Face- 2.00"; Other gunhouse- 2.00"; Barbette/hoist- 2.00" / 51 mm

3rd: Face- 0.50"

- Armour deck: 5.58", Conning tower: 15.00"

Machinery
4 Nuclear Power Reactors,
4 drive shafts
Range- Unlimited, restricted to crew endurance
Bunker at max displacement = 167,076 tons

Complement
18,991 - 24,690

Cost
$1,564.672 million

Distribution of weights at normal displacement
Armament: 10,393 tons, 0.8 %

Armour: 72,910 tons, 5.7 %
- Belts: 4,686 tons, 0.4 %
- Torpedo bulkhead: 1,379 tons, 0.1 %
- Armament: 10,696 tons, 0.8 %
- Armour Deck: 52,345 tons, 4.1 %
- Conning Tower: 3,804 tons, 0.3 %

Machinery: 7,032 tons, 0.6 %
Hull, fittings & equipment: 1,061,559 tons, 83.1 %
Fuel, ammunition & stores: 124,967 tons, 9.8 %
Miscellaneous weights: 54 tons, 0.0 %

Overall survivability and seakeeping ability
Survivability (Non-critical penetrating hits needed to sink ship): 9,888,471 lbs= 1,265.7 x 25.0 " / 635 mm shells or 8,130.3 torpedoes

Stability (Unstable if below 1.00): 1.65
Metacentric height 67.3 ft / 20.5 m
Roll period: 16.6 seconds

Steadiness
- As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.02

Seaboat quality (Average = 1.00): 0.71

Hull form characteristics
Hull has a flush deck
Block coefficient: 0.673
Length to Beam Ratio: 6.16 : 1
'Natural speed' for length: 44.70 kts
Power going to wave formation at top speed: 20 %
Trim (Max stability = 0, Max steadiness = 100): 74
Bow angle (Positive = bow angles forward): 17.00 degrees
Stern overhang: 4.40 ft / 1.34 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.22 ft / 9.52 m
- Forecastle (21 %): 20.83 ft / 6.35 m
- Mid (50 %): 20.01 ft / 6.10 m
- Quarterdeck (22 %): 20.83 ft / 6.35 m
- Stern: 21.33 ft / 6.50 m
- Average freeboard: 21.52 ft / 6.56 m

Ship tends to be wet forward

Ship space, strength and comments
Space - Hull below water (magazines/engines, low = better): 10.9 %
- Above water (accommodation/working, high = better): 103.9 %

Waterplane Area: 507,073 Square feet or 47,109 Square metres
Displacement factor (Displacement / loading): 750 %
Structure weight / hull surface area: 1,726 lbs/sq ft or 8,429 Kg/sq metre

Hull strength (Relative)
Cross-sectional: 4.75
Longitudinal: 2.71
Overall: 3.12

Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

wow, thats quite a lot of bit of info, did you finally find a program for all this or is this or is this just straight out calculation. If the former please share the wealth, lol, if the latter congrats the hard work you put into it shows quite well.

I only have two things that have raiseda few questions.
1) Six mounts for 10 guns? are you mounting single 25" guns? in one or two of those turrets?

2) 27.9mm guns seems like a bad logistical choice, with 30mm having a higher velocity, better punch, and cheaper to come by. Now you may use that caliber all the time, which would remove this concern as its what you have onhand, but int he world sense that seems an odd choice.

OOC: First of all, the beam is slightly too light. I'd up it by about half (to around 150 or so). The biggest problem though is that draft is much too deep. I'd drop that by about half.

Another thing is that complement is much too high. I think a complement of about 7,000 including air crew (if you're going to have an aircraft complement) would be good for that ship. There's no mention of aircraft in the ship and many of the better SDs have aircraft.

You have way too many gun types and no listing for missiles. You're going to need to put some VLS tubes in there, some SAMs need to go in there. I like your use of 25 inch guns, though I'd prefer using one type of turret (triples or doubles) instead of having triples and doubles. I am not a fan of quad turrets, but some SDs use them.

OOC: Thanks guys. I'll make changes accordingly, soon.

Also, Mekugi, for learning purposes, I decided to use a program to get me started with the basic framework for my Dreadnought. The program is called springsharp. You can get it from http://www.springsharp.com. Its pretty nifty but you'll have to make quite a few adjustments to the designs that you produce with it. You'll see if you download it. Its freeware.

Another SD? They're being whisked out now!!

What's that, four? five? SD's released this month? Is there an arms race or something?

Anyways, I like it. Just the main problems I see with it have been mentioned.

Other than what has otherwise been mentioned before hand, it's a very good ship. Well Done.

Design Flaw Update #1
Major problems addressed


Credonia Class Super Dreadnought (SDN)

Displacement
1,831,693 tons light; 1,880,286 tons standard; 2,019,194 tons normal; 2,130,320 tons full load

Dimensions
Length overall / water x beam x draught
3,173.39 ft / 3,159.45 ft x 324.42 ft x 102.45 ft (normal load)
967.25 m / 963.00 m x 98.88 m x 31.23 m

Armament
10 - 27.00" / 686 mm guns in single mounts, 9,841.50lbs / 4,464.03kg shells
Breech loading guns in turrets (on barbettes) on centreline, evenly spread, all raised mounts

16 - 5.00" / 127 mm guns (8x2 guns), 62.50lbs / 28.35kg shells
Dual purpose guns in deck mounts with hoists on side, all amidships, 4 raised mounts - superfiring

20 - 1.18" / 30.0 mm guns (5x4 guns), 0.82lbs / 0.37kg shells
Anti-aircraft guns in deck mounts on side, all amidships, all raised mounts - superfiring

34 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells
Anti-aircraft guns in deck mounts on side, all amidships, all raised mounts - superfiring

8 - 10.00" / 254 mm guns in single mounts, 500.00lbs / 226.80kg shells
Muzzle loading guns in deck mounts on side, all amidships, all raised mounts - superfiring; Weight of broadside 83,147 lbs / 37,715 kg; Shells per gun, main battery: 142

30 - 25.0" / 635 mm submerged torpedo tubes

Armour
- Belts
Main : Width- 12.2"; Length- 379.63 ft; Height- 15.09 ft

Ends: Unarmoured

Main Belt covers 29 % of normal length

- Torpedo Bulkhead
Width- 4.00"; Length- 379.63 ft; Height- 24.54 ft

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: Face- 18.0"; Other gunhouse- 9.50"; Barbette/hoist-17.3" / 439 mm

2nd: Face- 2.00"; Other gunhouse- 2.00"; Barbette/hoist- 2.00" / 51 mm

3rd: Face- 0.50"

- Armour deck: 5.58", Conning tower: 15.00"

Machinery
4 Nuclear Power Reactors,
2 drive shafts
Range- Unlimited, restricted to crew endurance
Bunker at max displacement = 167,076 tons

Complement
8,000

Estimated Cost to Build
$238 Billion

Distribution of weights at normal displacement
Armament: 12,930 tons, 0.6 %

Armour: 106,595 tons, 5.3 %
- Belts: 4,753 tons, 0.2 %
- Torpedo bulkhead: 1,379 tons, 0.1 %
- Armament: 12,526 tons, 0.6 %
- Armour Deck: 82,774 tons, 4.1 %
- Conning Tower: 5,163 tons, 0.3 %

Machinery: 9,930 tons, 0.5 %
Hull, fittings & equipment: 1,702,184 tons, 84.3 %
Fuel, ammunition & stores: 187,501 tons, 9.3 %
Miscellaneous weights: 54 tons, 0.0 %

Hull form characteristics
Hull has a flush deck
Block coefficient: 0.673
Length to Beam Ratio: 9.74 : 1
'Natural speed' for length: 56.21 kts
Power going to wave formation at top speed: 10 %
Trim (Max stability = 0, Max steadiness = 100): 79
Bow angle (Positive = bow angles forward): 17.00 degrees
Stern overhang: 4.40 ft / 1.34 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.22 ft / 9.52 m
- Forecastle (21 %): 20.83 ft / 6.35 m
- Mid (50 %): 20.01 ft / 6.10 m
- Quarterdeck (22 %): 20.83 ft / 6.35 m
- Stern: 21.33 ft / 6.50 m
- Average freeboard: 21.52 ft / 6.56 m

Ship tends to be wet forward

Ship space, strength and comments
Space - Hull below water (magazines/engines, low = better): 9.2 %
- Above water (accommodation/working, high = better): 116.5 %

Waterplane Area: 801,838 Square feet or 74,493 Square metres
Displacement factor (Displacement / loading): 878 %
Structure weight / hull surface area: 1,751 lbs/sq ft or 8,548 Kg/sq metre

Hull strength (Relative)
Cross-sectional: 4.92
Longitudinal: 1.10
Overall: 1.60

OOC: Good to see there are some improvements. However, that cost to build is ridiculously low. It would cost about $3 billion for a new build of an Iowa-class battleship modernised to 2008-09 requirements. A ship of that size and complexity, not to mention weapons mounts, would cost much closer to $200 billion.

Updated to show realistic cost value (dont ask me why i made it only $2 billion..wasnt paying attention i suppose).

More Updates to Come

Additional gun armaments (SAM, AA)
Missile armaments (VLS tubes)
Aircraft
Electronics systems (radar, jamming, etc.)

Looks good Credonia! This will challenge my Couragous-Class SD :)

Looks good Credonia! This will challenge my Couragous-Class SD :)

I don't wanna hijack the thread but could you give me a link to your SD Space Union?

Major Problems Addressed

Looking good!

I don't wanna hijack the thread but could you give me a link to your SD Space Union

We would be more than happy to, but this was a joint-project with Praetonia and they have the most updated specs with them. They said they would put it up but I think they may have forgetton. I'll TG them again. It should be up in a while. Sorry :(

Prae's probably very busy with school. He goes to a rather intensive school.

OOC: Credonia, this is an incredibly impressive design for which you must certainly be congratulated. I am sorry that our collaboration was soured by my actions, but it seems as if you will produce an even better design in any case. Best wishes on the Credonia-class!

A number of minor adjustments to the guns and some much needed additions have been made to the design: VLS Systems, Countermeasures, and Sensors.

Credonia Class Super Dreadnought (SDN)

Displacement
1,831,693 tons light; 1,880,286 tons standard; 2,019,194 tons normal; 2,130,320 tons full load

Dimensions
Length overall / water x beam x draught
3,173.39 ft / 3,159.45 ft x 324.42 ft x 102.45 ft (normal load)
967.25 m / 963.00 m x 98.88 m x 31.23 m

Armament
10 x 27.00" / 686 mm guns in single mounts
Breech loading guns in turrets (on barbettes) on centreline, evenly spread, all raised mounts

16 x 5.00" / 127 mm guns (8x2 guns)
Dual purpose guns in deck mounts with hoists on side, evenly spread, all raised mounts - superfiring

20 x 20 mm Mk 15 Phalanx CIWS gun batteries
Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts - superfiring

34 x 0.79" / 20.0 mm guns in single mounts
Evenly spread, all raised mounts - superfiring

8 x 16.00" Mk 7 50-Caliber Gun
Evenly spread, all raised mounts - superfiring

148 x Mk 41 VLS, Tomahawk Cruise Missiles
Mounted aft

20 x Mk 29 GMLS, RIM-7 Sea Sparrow Missiles
Mounted aft

20 x Mk 141 Harpoon launcher, Harpoon Missiles
Deck mounts on side, evenly spread

32 x Mk 41 VLS, LGM-56C Nuclear Ballistic Missiles
Mounted aft

30 x 25.0" / 635 mm submerged torpedo tubes

Aircraft

Vehicles

Armour
- Belts
Main : Width- 12.2"; Length- 379.63 ft; Height- 15.09 ft

Ends: Width- 12.2"; Length- 379.63 ft; Height- 15.09 ft

- Torpedo Bulkhead
Width- 4.00"; Length- 379.63 ft; Height- 24.54 ft

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: Face- 18.0"; Other gunhouse- 9.50"; Barbette/hoist-17.3" / 439 mm

2nd: Face- 2.00"; Other gunhouse- 2.00"; Barbette/hoist- 2.00" / 51 mm

3rd: Face- 0.50"

- Armour deck: 5.58", Conning tower: 15.00"

Countermeasures- Radar
AN/WLR-1H(v)
AN/ULQ-16(v)2
AN/SRS-1A(v) Combat RF
AN/SLQ-32 ESM

Sensors- Radar
AN/SPS-55 Surface Search
AN/SPY-1 Radar
VT-1 SODAR

Sensors- Sonar
AN/SQQ-89

Communications
AN/WSC-6(v)

Command
AN/USQ-119E(v)

Intelligence
AN/ULQ-20 BGPHES

Machinery
8 Nuclear Power Reactors,
Range- Unlimited, restricted to crew endurance
Bunker at max displacement = 167,076 tons

Crew Complement
10,500

Hull form characteristics
Hull has a flush deck
Block coefficient: 0.673
Length to Beam Ratio: 9.74 : 1
'Natural speed' for length: 56.21 kts
Power going to wave formation at top speed: 10 %
Trim (Max stability = 0, Max steadiness = 100): 79
Bow angle (Positive = bow angles forward): 17.00 degrees
Stern overhang: 4.40 ft / 1.34 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.22 ft / 9.52 m
- Forecastle (21 %): 20.83 ft / 6.35 m
- Mid (50 %): 20.01 ft / 6.10 m
- Quarterdeck (22 %): 20.83 ft / 6.35 m
- Stern: 21.33 ft / 6.50 m
- Average freeboard: 21.52 ft / 6.56 m

Ship space and strength
Space - Hull below water (magazines/engines, low = better): 9.2 %
- Above water (accommodation/working, high = better): 116.5 %

Waterplane Area: 801,838 Square feet or 74,493 Square metres
Displacement factor (Displacement / loading): 878 %
Structure weight / hull surface area: 1,751 lbs/sq ft or 8,548 Kg/sq metre

Hull strength (Relative)
Cross-sectional: 4.92
Longitudinal: 1.10
Overall: 1.60

Estimated Cost to Build
$258 Billion

*tag*

OOC: Credonia, this is an incredibly impressive design for which you must certainly be congratulated. I am sorry that our collaboration was soured by my actions, but it seems as if you will produce an even better design in any case. Best wishes on the Credonia-class!


OOC: Wow..I didnt realize my ship would turn out to be this good, let alone expect to get praise for it. Thanks. Its kinda funny becaue this is my first self-custom built navy vessel and well, It has potential to rival the Doujin, something I wasnt aiming for. This was more of like a project to get me used to designing such ships so that in the future I could build one as powerful as if not more powerful and larger than the Doujin. I pulled up some old D.C. specs and I realize that it is only larger than the Credonia class by some 19 meters. Im ecstatic that ive been able to create such a vessel capable of challenging one of NS' naval beasts. Who woulda thought?

bump

OOC: Wow..I didnt realize my ship would turn out to be this good, let alone expect to get praise for it.

That what I said about mine.

But it is a very impressive design, it does rival the Doujin Class, but there aren't many of those around now... shame.

bump

Would you be interested in a very accurate/high ROF CIWS system with a viturally endless supply of ammo and a velocity of over 5000fps?

TG me for details.

It's not really a CIWS yet! with a few tweaks, modification and other stuff you'd have all the stuff listed above

An amazing job you have done, I have to call that the best design I have ever heard.

Would you be interested in a very accurate/high ROF CIWS system with a viturally endless supply of ammo and a velocity of over 5000fps?

TG me for details.

It's not really a CIWS yet! with a few tweaks, modification and other stuff you'd have all the stuff listed above

TG me the details if you could. I could possibly use it on a smaller Dreadnought since i think im going to start designing and selling them. Thanks for the offer.

Credonia Class Super Dreadnought (SDN)

Displacement
1,831,693 tons light; 1,880,286 tons standard; 2,019,194 tons normal; 2,130,320 tons full load

Dimensions
Length overall / water x beam x draught
3,173.39 ft / 3,159.45 ft x 324.42 ft x 102.45 ft (normal load)
967.25 m / 963.00 m x 98.88 m x 31.23 m

Armament
10 x 27.00" / 686 mm guns in single mounts
Breech loading guns in turrets (on barbettes) on centreline, evenly spread, all raised mounts

16 x 5.00" / 127 mm guns (8x2 guns)
Dual purpose guns in deck mounts with hoists on side, evenly spread, all raised mounts - superfiring

20 x 20 mm Mk 15 Phalanx CIWS gun batteries
Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts - superfiring

34 x 0.79" / 20.0 mm guns in single mounts
Evenly spread, all raised mounts - superfiring

8 x 16.00" Mk 7 50-Caliber Gun
Evenly spread, all raised mounts - superfiring

148 x Mk 41 VLS, Tomahawk Cruise Missiles
Mounted aft

20 x Mk 29 GMLS, RIM-7 Sea Sparrow Missiles
Mounted aft

20 x Mk 141 Harpoon launcher, Harpoon Missiles
Deck mounts on side, evenly spread

32 x Mk 41 VLS, LGM-56C Nuclear Ballistic Missiles
Mounted aft

30 x 25.0" / 635 mm submerged torpedo tubes

Aircraft
120 F/A-18 Hornet
35 P-3C Orion
20 SH-60 Seahawk
50 AV-8B Harrier

Vehicles
20 LCAC
20 RIB

Armour
- Belts
Main : Width- 12.2"; Length- 379.63 ft; Height- 15.09 ft

Ends: Width- 12.2"; Length- 379.63 ft; Height- 15.09 ft

- Torpedo Bulkhead
Width- 4.00"; Length- 379.63 ft; Height- 24.54 ft

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: Face- 18.0"; Other gunhouse- 9.50"; Barbette/hoist-17.3" / 439 mm

2nd: Face- 2.00"; Other gunhouse- 2.00"; Barbette/hoist- 2.00" / 51 mm

3rd: Face- 0.50"

- Armour deck: 5.58", Conning tower: 15.00"

Countermeasures- Radar
AN/WLR-1H(v)
AN/ULQ-16(v)2
AN/SRS-1A(v) Combat RF
AN/SLQ-32 ESM

Sensors- Radar
AN/SPS-55 Surface Search
AN/SPY-1 Radar
VT-1 SODAR

Sensors- Sonar
AN/SQQ-89

Communications
AN/WSC-6(v)

Command & Control
AN/USQ-119E(v)

Intelligence
AN/ULQ-20 BGPHES

Machinery
8 Nuclear Power Reactors,
Range- Unlimited, restricted to crew endurance
Bunker at max displacement = 167,076 tons

Crew Complement
10,500 crew members; can transport up to 20,00

Hull form characteristics
Hull has a flush deck
Block coefficient: 0.673
Length to Beam Ratio: 9.74 : 1
'Natural speed' for length: 56.21 kts
Power going to wave formation at top speed: 10 %
Trim (Max stability = 0, Max steadiness = 100): 79
Bow angle (Positive = bow angles forward): 17.00 degrees
Stern overhang: 4.40 ft / 1.34 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.22 ft / 9.52 m
- Forecastle (21 %): 20.83 ft / 6.35 m
- Mid (50 %): 20.01 ft / 6.10 m
- Quarterdeck (22 %): 20.83 ft / 6.35 m
- Stern: 21.33 ft / 6.50 m
- Average freeboard: 21.52 ft / 6.56 m

Ship space and strength
Space - Hull below water (magazines/engines, low = better): 9.2 %
- Above water (accommodation/working, high = better): 116.5 %

Waterplane Area: 801,838 Square feet or 74,493 Square metres
Displacement factor (Displacement / loading): 878 %
Structure weight / hull surface area: 1,751 lbs/sq ft or 8,548 Kg/sq metre

Hull strength (Relative)
Cross-sectional: 4.92
Longitudinal: 1.10
Overall: 1.60

Estimated Cost to Build
$260 Billion

oh.. yummy..

Now that you've put VLS tubes and a load of aircraft it's probably now a SND.

(Speaking of aircraft i've gotta put more on mine!)

Great final design.

Whats SND stand for?

Whats SND stand for?
I think he meant SDN which would be Super Dreadnought

I think he meant SDN which would be Super Dreadnought

Yeah I did. That's a bad mistake by me.

Although I've seen nations that have DD+ for destroyers. Does that mean something like it is no ordinary destroyer or something. If so would this apply to mine, Credonia's, Sarzonia's and other nations' Super Dreadnoughts making them SDN+?

Yeah I did. That's a bad mistake by me.

Although I've seen nations that have DD+ for destroyers. Does that mean something like it is no ordinary destroyer or something. If so would this apply to mine, Credonia's, Sarzonia's and other nations' Super Dreadnoughts making them SDN+?
No, the US and most Navys have used the DD sign of Destroyers since before WWI which is why battle ships are signed BB's and cruisers are C (Or CC I forget), a guide missile nuclear powered destroyer would be DDGN and a guide missile cruiser is CG, and the nuclear powered battleships you se around NS are all called BBN, most Super Dreadnoughts would be SDs, not SDN.

Oh right, yeah, okay.
Thanks for clearing that up, I've just seen some nations on NS put a "+" after some of their more custom ships.

But what you said makes sense cuz you've got SSBNs SSNs and a load of other stuff.

Thanks anyway.

Oh right, yeah, okay.
Thanks for clearing that up, I've just seen some nations on NS put a "+" after some of their more custom ships.

But what you said makes sense cuz you've got SSBNs SSNs and a load of other stuff.

Thanks anyway.
I'm glad it made sense, I read my won post and barely understood it! lol

I never figured out my Ballistic Missile Subs and Attack Submarines were called SSBNs and SSNs and I've seen SSGN (Maybe it stands for picket subs or something like that)

Oh and Credonia sorry of hijacking your thread. :D

OOC: SSGN is for guided missile submarine.

OOC: SSGN is for guided missile submarine.
Ah cool, so wouldn't the Los Angeles attack submarines be considered SSGNs cause they carry Tomahawk Cruise missiles and Harpoon Anti-Ship missiles?

The Los Angeles is still considered a SSN, but it might be considered sort of a hybrid since it can fire those missiles. However, it's not called that at all since its mission is still that of an attack submarine.

Ah, ok, cool

-taggage-