Aztec Ships 1938

[TacCovert4]

Starting things off, we're over halfway through building Sovereign of the Seas....so time to lay down the next ship in the progression.  A bit larger, more heavily armored with emphasis on deck for plunging fire and now very anticipated larger and larger bombs.  Deep torpedo protection.  And in a departure for Aztec Battleships, the end belts and decks are markedly thicker, enough to outright repel destroyer and quite a lot of cruisers guns entirely, which will keep hits to these areas from degrading performance.

Relentless, Aztec Battleship laid down 1938

Displacement:
   60,690 t light; 63,896 t standard; 68,546 t normal; 72,267 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (928.19 ft / 918.64 ft) x 121.39 ft x (35.27 / 36.81 ft)
   (282.91 m / 280.00 m) x 37.00 m  x (10.75 / 11.22 m)

Armament:
      8 - 17.72" / 450 mm 45.0 cal guns - 2,804.10lbs / 1,271.92kg shells, 110 per gun
     Breech loading guns in turret on barbette mounts, 1938 Model
     2 x 4-gun mounts on centreline, forward evenly spread
      1 raised mount
      24 - 4.72" / 120 mm 55.0 cal guns - 56.91lbs / 25.81kg shells, 500 per gun
     Dual purpose guns in deck and hoist mounts, 1938 Model
     8 x Twin mounts on sides, aft evenly spread
      4 raised mounts
     4 x Twin mounts on centreline, aft evenly spread
      2 double raised mounts
      1 hull mount in casemate- Limited use in heavy seas
      32 - 1.57" / 40.0 mm 50.0 cal guns - 2.07lbs / 0.94kg shells, 2,000 per gun
     Anti-air guns in deck and hoist mounts, 1938 Model
     8 x 4 row quad mounts on sides, aft evenly spread
      4 raised mounts
      40 - 0.79" / 20.0 mm 50.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun
     Anti-air guns in deck mounts, 1938 Model
     20 x Single mounts on sides, evenly spread
      Weight of broadside 23,875 lbs / 10,830 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   15.7" / 400 mm   597.11 ft / 182.00 m   16.40 ft / 5.00 m
   Ends:   4.72" / 120 mm   321.49 ft / 97.99 m   16.40 ft / 5.00 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -10.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      3.94" / 100 mm   597.11 ft / 182.00 m   34.32 ft / 10.46 m
   Beam between torpedo bulkheads 98.43 ft / 30.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   17.7" / 450 mm   9.84" / 250 mm      15.7" / 400 mm
   3rd:   3.15" / 80 mm   2.76" / 70 mm      3.15" / 80 mm
   4th:   0.98" / 25 mm   0.98" / 25 mm      0.98" / 25 mm

   - Armoured deck - multiple decks:
   For and Aft decks: 7.87" / 200 mm
   Forecastle: 1.77" / 45 mm  Quarter deck: 3.15" / 80 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric cruising motors plus geared drives, 4 shafts, 184,047 shp / 137,299 Kw = 30.00 kts
   Range 10,000nm at 16.00 kts
   Bunker at max displacement = 8,370 tons

Complement:
   2,117 - 2,753

Cost:
   £28.689 million / $114.757 million

Distribution of weights at normal displacement:
   Armament: 4,659 tons, 6.8 %
      - Guns: 4,659 tons, 6.8 %
   Armour: 25,245 tons, 36.8 %
      - Belts: 7,511 tons, 11.0 %
      - Torpedo bulkhead: 2,985 tons, 4.4 %
      - Armament: 3,937 tons, 5.7 %
      - Armour Deck: 10,812 tons, 15.8 %
   Machinery: 5,040 tons, 7.4 %
   Hull, fittings & equipment: 23,330 tons, 34.0 %
   Fuel, ammunition & stores: 7,856 tons, 11.5 %
   Miscellaneous weights: 2,417 tons, 3.5 %
      - Hull below water: 1,465 tons
      - Hull above water: 433 tons
      - On freeboard deck: 60 tons
      - Above deck: 459 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     108,428 lbs / 49,182 Kg = 39.0 x 17.7 " / 450 mm shells or 21.5 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 8.1 ft / 2.5 m
   Roll period: 17.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.56
   Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and small transom stern
   Block coefficient (normal/deep): 0.610 / 0.616
   Length to Beam Ratio: 7.57 : 1
   'Natural speed' for length: 32.71 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 64
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  26.25 ft / 8.00 m,  22.97 ft / 7.00 m
      - Forward deck:   30.00 %,  22.97 ft / 7.00 m,  21.33 ft / 6.50 m
      - Aft deck:   35.00 %,  21.33 ft / 6.50 m,  19.69 ft / 6.00 m
      - Quarter deck:   15.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      21.63 ft / 6.59 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 71.7 %
      - Above water (accommodation/working, high = better): 161.5 %
   Waterplane Area: 84,420 Square feet or 7,843 Square metres
   Displacement factor (Displacement / loading): 116 %
   Structure weight / hull surface area: 229 lbs/sq ft or 1,119 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - Longitudinal: 1.02
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform


1265 - Electric Drives
200t - Additional Pumps and DC Gear
467t - 1930 FC
100t - Additional FC Equipment (Fire Control Center)
100t - NF Devices x 4 (space for radar)
25t - LR Radio
200t - Flag Facilities
10t - 2 x Catapult
50t - 2 x Armed Floatplane Aft

Decks are:  45mm Decapping/Initiating, 140mm Main, 15mm Splinter

[TacCovert4]

Next, there are 3 of the Battle Class escort carriers.  With the expectation of both potential convoys in wartime and a slow wing of the battle line to escort, there's need for a few more escort carrier types.  The Battle Mk2 is slightly larger than the original, slightly better protected, and with a bit more AA (2 more twin 90mm DP mounts).  The odd-number 29 aircraft air group allows for some role expansion for its air group without avoiding the core competencies of scouting for the battle line, CAP, and finishing off crippled ships with small-group TB strikes.

Battle Mk2, Aztec Escort Carrier laid down 1938

Displacement:
   9,311 t light; 9,664 t standard; 10,559 t normal; 11,276 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (557.74 ft / 557.74 ft) x 62.34 ft x (19.69 / 20.73 ft)
   (170.00 m / 170.00 m) x 19.00 m  x (6.00 / 6.32 m)

Armament:
      12 - 3.54" / 90.0 mm 55.0 cal guns - 24.01lbs / 10.89kg shells, 400 per gun
     Dual purpose guns in deck mounts, 1938 Model
     4 x Twin mounts on sides, evenly spread
      2 raised mounts
     2 x Single mounts on sides amidships
      2 double raised mounts
      16 - 1.57" / 40.0 mm 50.0 cal guns - 2.07lbs / 0.94kg shells, 4,000 per gun
     Anti-air guns in deck and hoist mounts, 1938 Model
     4 x 4 row quad mounts on sides, evenly spread
      16 - 0.79" / 20.0 mm 55.0 cal guns - 0.26lbs / 0.12kg shells, 1,500 per gun
     Anti-air guns in deck mounts, 1938 Model
     16 x Single mounts on sides, evenly spread
      Weight of broadside 325 lbs / 148 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Ends:   Unarmoured

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.18" / 30 mm   362.53 ft / 110.50 m   17.95 ft / 5.47 m
   Beam between torpedo bulkheads 45.93 ft / 14.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.18" / 30 mm   1.18" / 30 mm            -
   2nd:   0.79" / 20 mm   0.79" / 20 mm      0.79" / 20 mm

   - Box over machinery & magazines:
   2.36" / 60 mm

   - Conning towers: Forward 1.57" / 40 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 46,838 shp / 34,941 Kw = 27.00 kts
   Range 8,400nm at 14.00 kts
   Bunker at max displacement = 1,612 tons

Complement:
   520 - 677

Cost:
   £2.976 million / $11.903 million

Distribution of weights at normal displacement:
   Armament: 76 tons, 0.7 %
      - Guns: 76 tons, 0.7 %
   Armour: 902 tons, 8.5 %
      - Torpedo bulkhead: 284 tons, 2.7 %
      - Armament: 59 tons, 0.6 %
      - Armour Deck: 542 tons, 5.1 %
      - Conning Tower: 16 tons, 0.2 %
   Machinery: 1,283 tons, 12.1 %
   Hull, fittings & equipment: 4,032 tons, 38.2 %
   Fuel, ammunition & stores: 1,248 tons, 11.8 %
   Miscellaneous weights: 3,018 tons, 28.6 %
      - Hull below water: 1,428 tons
      - Hull above water: 1,477 tons
      - On freeboard deck: 45 tons
      - Above deck: 68 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     23,197 lbs / 10,522 Kg = 1,042.9 x 3.5 " / 90 mm shells or 3.3 torpedoes
   Stability (Unstable if below 1.00): 1.22
   Metacentric height 3.6 ft / 1.1 m
   Roll period: 13.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.07
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.540 / 0.548
   Length to Beam Ratio: 8.95 : 1
   'Natural speed' for length: 23.62 kts
   Power going to wave formation at top speed: 51 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Forward deck:   30.00 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Aft deck:   35.00 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Quarter deck:   15.00 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Average freeboard:      29.53 ft / 9.00 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 99.5 %
      - Above water (accommodation/working, high = better): 260.0 %
   Waterplane Area: 24,038 Square feet or 2,233 Square metres
   Displacement factor (Displacement / loading): 158 %
   Structure weight / hull surface area: 84 lbs/sq ft or 412 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 3.99
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

8t - 1930 FC
25t - NF Devices
10t - Additional SR Radio
25t - LR Radio

20t - 4 x Catapult in Deck
25t - Firefighting Equipment

100t - Firefighting Equipment in Hangar

50t - Additional DC Equipment

2755t - 29 x Aircraft 1933+
(Standard Mix:  16F 13 TB/S)

[TacCovert4]

And finally, in the vein of Destroyers, a new class of large DD leader will be looked at.  A lesson from the Mayan war, perhaps the wrong lesson, that Destroyers get chewed up in a fight quickly and need very hard-hitting guns, results in a design using the new 155mm/55cal DP gun, in it's single barrel configuration.  While the destroyer might be suitable only for the Caribbean Theater with its relatively short ranges, she is built to hit as hard as possible against surface ships, with her AA ability being considered moderate due to her weaker secondary AA and the slower RoF of the 155mm gun when compared to the 90 or 120.  To fit that much main gun onto a DD, a full 4 of them, plus torpedoes, accessories, and the necessary speed to hit 50%.....this ship is deficient in ASW, and AA, but built as a leader vessel made to take out enemy destroyers at range and quickly, with enough bulk to take a hit or two from standard destroyer weapons without any particularly ill effects.

N-Class, Aztec Destroyer laid down 1938

Displacement:
    2,500 t light; 2,707 t standard; 2,902 t normal; 3,057 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
    (440.24 ft / 433.07 ft) x 40.19 ft x (11.05 / 11.50 ft)
    (134.18 m / 132.00 m) x 12.25 m  x (3.37 / 3.51 m)

Armament:
      4 - 6.10" / 155 mm 55.0 cal guns - 122.64lbs / 55.63kg shells, 500 per gun
      Dual purpose guns in deck and hoist mounts, 1938 Model
      4 x Single mounts on centreline ends, evenly spread
        2 raised mounts - superfiring
      4 - 1.57" / 40.0 mm 55.0 cal guns - 2.11lbs / 0.96kg shells, 2,000 per gun
      Anti-air guns in deck mounts, 1938 Model
      1 x Twin mount on centreline amidships (forward deck)
      1 x Twin mount layout not set
        1 raised mount
      16 - 0.79" / 20.0 mm 55.0 cal guns - 0.26lbs / 0.12kg shells, 1,500 per gun
      Anti-air guns in deck mounts, 1938 Model
      16 x Single mounts on side ends, evenly spread
      Weight of broadside 503 lbs / 228 kg

Armour:
  - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    0.47" / 12 mm    0.39" / 10 mm        0.47" / 12 mm

  - Conning towers: Forward 0.47" / 12 mm, Aft 0.00" / 0 mm

Machinery:
    Oil fired boilers, steam turbines,
    Geared drive, 2 shafts, 60,224 shp / 44,927 Kw = 34.20 kts
    Range 3,800nm at 14.00 kts
    Bunker at max displacement = 350 tons

Complement:
    196 - 256

Cost:
    £1.965 million / $7.861 million

Distribution of weights at normal displacement:
    Armament: 173 tons, 6.0 %
      - Guns: 173 tons, 6.0 %
    Armour: 15 tons, 0.5 %
      - Armament: 13 tons, 0.4 %
      - Conning Tower: 2 tons, 0.1 %
    Machinery: 1,452 tons, 50.0 %
    Hull, fittings & equipment: 793 tons, 27.3 %
    Fuel, ammunition & stores: 401 tons, 13.8 %
    Miscellaneous weights: 67 tons, 2.3 %
      - Hull below water: 5 tons
      - Hull above water: 9 tons
      - On freeboard deck: 20 tons
      - Above deck: 33 tons

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      779 lbs / 353 Kg = 6.9 x 6.1 " / 155 mm shells or 0.4 torpedoes
    Stability (Unstable if below 1.00): 1.16
    Metacentric height 1.7 ft / 0.5 m
    Roll period: 13.0 seconds
    Steadiness    - As gun platform (Average = 50 %): 60 %
            - Recoil effect (Restricted arc if above 1.00): 0.67
    Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
    Hull has a flush deck,
      a normal bow and a cruiser stern
    Block coefficient (normal/deep): 0.528 / 0.534
    Length to Beam Ratio: 10.78 : 1
    'Natural speed' for length: 20.81 kts
    Power going to wave formation at top speed: 66 %
    Trim (Max stability = 0, Max steadiness = 100): 60
    Bow angle (Positive = bow angles forward): 20.00 degrees
    Stern overhang: 0.00 ft / 0.00 m
    Freeboard (% = length of deck as a percentage of waterline length):
                Fore end,    Aft end
      - Forecastle:    20.00 %,  19.69 ft / 6.00 m,  18.04 ft / 5.50 m
      - Forward deck:    30.00 %,  18.04 ft / 5.50 m,  17.55 ft / 5.35 m
      - Aft deck:    35.00 %,  17.55 ft / 5.35 m,  17.06 ft / 5.20 m
      - Quarter deck:    15.00 %,  17.06 ft / 5.20 m,  17.06 ft / 5.20 m
      - Average freeboard:        17.70 ft / 5.39 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 184.0 %
        - Above water (accommodation/working, high = better): 202.8 %
    Waterplane Area: 11,902 Square feet or 1,106 Square metres
    Displacement factor (Displacement / loading): 74 %
    Structure weight / hull surface area: 41 lbs/sq ft or 198 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0.50
        - Longitudinal: 1.45
        - Overall: 0.55
    Cramped machinery, storage, compartmentation space
    Excellent accommodation and workspace room

17t - 1918 FC

5t - Basic Hydrophones

20t - 1x5x21in HW TT Centerline

25t - NF Devices

[Kaiser Kirk]

6" guns on Destroyer hulls historically didn't fare so well for reasons Springsharp does not cover well.
Likewise 6" DP. ! One of the reasons I give many of my "innovative" designs a rest between the 1st of class and the rest.

I am strongly considering the 'Whirlwind' 8x435 30knt solely because you keep churning these out. I really prefer my 26 knot version, but there comes a point an Admiralty wants an 'equivalent' to the biggest baddest thing out there.


The Battle class has many of the 'short length' issues of many of the Parthian carriers. It's very similar to an updated Bazdari carrier.

[TacCovert4]

6" guns on Destroyer hulls historically didn't fare so well for reasons Springsharp does not cover well.
Likewise 6" DP. ! One of the reasons I give many of my "innovative" designs a rest between the 1st of class and the rest.

I am strongly considering the 'Whirlwind' 8x435 30knt solely because you keep churning these out. I really prefer my 26 knot version, but there comes a point an Admiralty wants an 'equivalent' to the biggest baddest thing out there.


The Battle class has many of the 'short length' issues of many of the Parthian carriers. It's very similar to an updated Bazdari carrier.

Looking at the SS for the DD, I've got a few edits I've got to make.  And yes, I concur that on the whole 6in guns don't work on DD hulls.  I figure this one tranche of DDs will be it for the 6in gun experiment on a DD hull, but it does make sense within the Aztec meta to build a 4 ship class of them to discover the losses in fire volume are not made up for with fire weight. 

I worked on several BB ideas, most of them trying to integrate a dual DP battery of 155s in 2 gun and 3 gun arrangements with 120 or 90mm guns, but ultimately settled on just pushing the number of 120s up even more as the 155s either didn't fit, cut the AA capacity (which by 1938 we know we need) too much, or in the best variant left me with an 8 gun 155 broadside, and 90mm surface mounts which would be a lot of expose ammunition high in the ship and make no sense on a BB.

Yeah, my escort carriers will have trouble later on.  As I've already developed out my aircraft, I can see that they'll wind up like the historical escort carriers with air groups that can't always take advantage of the absolute pinnacle of combat aircraft.  The Catapults and the sheer power of the Corsair mean they'll likely be able to operate them as pure fighters (not with bombs or rockets), but they'll be severely limited in their other aircraft options (likely just a mix of Corsair and Sea Wolf, like the historic escort carriers ran pretty much purely FM2 Wildcats and Avengers).  Of course they're in existence not to launch airstrikes, but to carry fighters to protect the slower battleships, and a few TBs to work over cripples or maybe slow down a fast BB enough that a pair of slow BBs can catch it and kill it.  In that vein, they're perfectly adequate for purpose.

[TacCovert4]

The first 'big' ship using the new 155mm/55 DP gun.  A modification of the venerable Lake-type, the Gulf class is more optimized for fighting smaller ships in a screening function, and at least in theory has a ferocious AAA suite with main and secondary DP batteries.

Gulf-Class, Aztec Frigate laid down 1938

Displacement:
   11,639 t light; 12,330 t standard; 13,579 t normal; 14,578 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (647.17 ft / 639.76 ft) x 70.54 ft x (19.69 / 20.81 ft)
   (197.26 m / 195.00 m) x 21.50 m  x (6.00 / 6.34 m)

Armament:
      12 - 6.10" / 155 mm 55.0 cal guns - 147.20lbs / 66.77kg shells, 300 per gun
     Dual purpose guns in turret on barbette mounts, 1938 Model
     4 x 3-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      12 - 3.54" / 90.0 mm 55.0 cal guns - 24.01lbs / 10.89kg shells, 400 per gun
     Dual purpose guns in deck mounts, 1938 Model
     6 x Twin mounts on sides, evenly spread
      16 - 1.57" / 40.0 mm 50.0 cal guns - 2.07lbs / 0.94kg shells, 3,000 per gun
     Anti-air guns in deck and hoist mounts, 1938 Model
     2 x 4 row quad mounts on sides, forward deck aft
      2 raised mounts
     2 x 4 row quad mounts on centreline ends, evenly spread
      2 double raised mounts
      20 - 0.79" / 20.0 mm 55.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun
     Anti-air guns in deck mounts, 1938 Model
     20 x Single mounts on sides, evenly spread
      Weight of broadside 2,093 lbs / 949 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.72" / 120 mm   435.04 ft / 132.60 m   13.12 ft / 4.00 m
   Ends:   1.97" / 50 mm   204.69 ft / 62.39 m   11.48 ft / 3.50 m
     Main Belt covers 105 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.18" / 30 mm   435.04 ft / 132.60 m   17.81 ft / 5.43 m
   Beam between torpedo bulkheads 54.13 ft / 16.50 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5.51" / 140 mm   2.99" / 76 mm      4.72" / 120 mm
   2nd:   2.76" / 70 mm   1.57" / 40 mm            -
   3rd:   0.79" / 20 mm   0.79" / 20 mm      0.79" / 20 mm
   4th:   0.59" / 15 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.95" / 75 mm
   Forecastle: 1.18" / 30 mm  Quarter deck: 1.57" / 40 mm

   - Conning towers: Forward 3.15" / 80 mm, Aft 3.15" / 80 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 81,607 shp / 60,878 Kw = 30.25 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 2,249 tons

Complement:
   628 - 817

Cost:
   £5.144 million / $20.578 million

Distribution of weights at normal displacement:
   Armament: 621 tons, 4.6 %
      - Guns: 621 tons, 4.6 %
   Armour: 3,792 tons, 27.9 %
      - Belts: 1,283 tons, 9.4 %
      - Torpedo bulkhead: 339 tons, 2.5 %
      - Armament: 531 tons, 3.9 %
      - Armour Deck: 1,562 tons, 11.5 %
      - Conning Towers: 77 tons, 0.6 %
   Machinery: 2,235 tons, 16.5 %
   Hull, fittings & equipment: 4,755 tons, 35.0 %
   Fuel, ammunition & stores: 1,940 tons, 14.3 %
   Miscellaneous weights: 237 tons, 1.7 %
      - Hull above water: 31 tons
      - On freeboard deck: 100 tons
      - Above deck: 106 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     22,614 lbs / 10,257 Kg = 199.0 x 6.1 " / 155 mm shells or 3.8 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 3.6 ft / 1.1 m
   Roll period: 15.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.35
   Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.535 / 0.543
   Length to Beam Ratio: 9.07 : 1
   'Natural speed' for length: 25.29 kts
   Power going to wave formation at top speed: 53 %
   Trim (Max stability = 0, Max steadiness = 100): 66
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   18.00 %,  20.34 ft / 6.20 m,  20.34 ft / 6.20 m
      - Forward deck:   30.00 %,  20.34 ft / 6.20 m,  18.04 ft / 5.50 m
      - Aft deck:   38.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Quarter deck:   14.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Average freeboard:      18.80 ft / 5.73 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 90.8 %
      - Above water (accommodation/working, high = better): 174.7 %
   Waterplane Area: 31,055 Square feet or 2,885 Square metres
   Displacement factor (Displacement / loading): 131 %
   Structure weight / hull surface area: 115 lbs/sq ft or 559 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.02
      - Longitudinal: 1.00
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

40t - 2 x 5 x 21in HW TT on sides aft
60t - 2 x Catapult and 2 x Armed floatplane

25t - LR Wireless
50t - NF Devices x 2
62t - 1918 FC

[TacCovert4]

A couple of minor edits to the Relentless.....mostly to clean up a few odds and ends.

Relentless, Aztec Battleship laid down 1938

Displacement:
   60,573 t light; 63,774 t standard; 68,291 t normal; 71,905 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (928.19 ft / 918.64 ft) x 121.39 ft x (35.14 / 36.67 ft)
   (282.91 m / 280.00 m) x 37.00 m  x (10.71 / 11.18 m)

Armament:
      8 - 17.72" / 450 mm 45.0 cal guns - 2,804.10lbs / 1,271.92kg shells, 110 per gun
     Breech loading guns in turret on barbette mounts, 1938 Model
     2 x 4-gun mounts on centreline, forward evenly spread
      1 raised mount
      24 - 4.72" / 120 mm 55.0 cal guns - 56.90lbs / 25.81kg shells, 500 per gun
     Dual purpose guns in deck and hoist mounts, 1938 Model
     8 x Twin mounts on sides, aft evenly spread
      4 raised mounts
     4 x Twin mounts on centreline, aft evenly spread
      2 double raised mounts
      1 hull mount in casemate- Limited use in heavy seas
      32 - 1.57" / 40.0 mm 50.0 cal guns - 2.07lbs / 0.94kg shells, 2,000 per gun
     Anti-air guns in deck and hoist mounts, 1938 Model
     8 x 4 row quad mounts on sides, aft evenly spread
      4 raised mounts
      40 - 0.79" / 20.0 mm 50.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun
     Anti-air guns in deck mounts, 1938 Model
     20 x Single mounts on sides, evenly spread
      Weight of broadside 23,875 lbs / 10,830 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   15.7" / 400 mm   597.11 ft / 182.00 m   16.40 ft / 5.00 m
   Ends:   4.72" / 120 mm   321.49 ft / 97.99 m   16.40 ft / 5.00 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -10.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      3.94" / 100 mm   597.11 ft / 182.00 m   34.32 ft / 10.46 m
   Beam between torpedo bulkheads 98.43 ft / 30.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   17.7" / 450 mm   9.84" / 250 mm      15.7" / 400 mm
   3rd:   3.15" / 80 mm   2.76" / 70 mm      3.15" / 80 mm
   4th:   0.98" / 25 mm   0.98" / 25 mm      0.98" / 25 mm

   - Armoured deck - multiple decks:
   For and Aft decks: 7.87" / 200 mm
   Forecastle: 1.77" / 45 mm  Quarter deck: 3.15" / 80 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric cruising motors plus geared drives, 4 shafts, 197,286 shp / 147,175 Kw = 30.00 kts
   Range 10,000nm at 16.00 kts
   Bunker at max displacement = 8,130 tons

Complement:
   2,111 - 2,745

Cost:
   £28.952 million / $115.809 million

Distribution of weights at normal displacement:
   Armament: 4,659 tons, 6.8 %
      - Guns: 4,659 tons, 6.8 %
   Armour: 24,967 tons, 36.6 %
      - Belts: 7,497 tons, 11.0 %
      - Torpedo bulkhead: 2,985 tons, 4.4 %
      - Armament: 3,937 tons, 5.8 %
      - Armour Deck: 10,548 tons, 15.4 %
   Machinery: 5,402 tons, 7.9 %
   Hull, fittings & equipment: 23,128 tons, 33.9 %
   Fuel, ammunition & stores: 7,718 tons, 11.3 %
   Miscellaneous weights: 2,417 tons, 3.5 %
      - Hull below water: 1,465 tons
      - Hull above water: 433 tons
      - On freeboard deck: 60 tons
      - Above deck: 459 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     103,228 lbs / 46,824 Kg = 37.1 x 17.7 " / 450 mm shells or 20.2 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 8.0 ft / 2.5 m
   Roll period: 18.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.57
   Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.610 / 0.615
   Length to Beam Ratio: 7.57 : 1
   'Natural speed' for length: 30.31 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 65
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  26.25 ft / 8.00 m,  22.97 ft / 7.00 m
      - Forward deck:   30.00 %,  22.97 ft / 7.00 m,  21.33 ft / 6.50 m
      - Aft deck:   35.00 %,  21.33 ft / 6.50 m,  19.69 ft / 6.00 m
      - Quarter deck:   15.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      21.63 ft / 6.59 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 74.0 %
      - Above water (accommodation/working, high = better): 157.9 %
   Waterplane Area: 82,324 Square feet or 7,648 Square metres
   Displacement factor (Displacement / loading): 114 %
   Structure weight / hull surface area: 229 lbs/sq ft or 1,120 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - Longitudinal: 1.01
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform


1265 - Electric Drives
200t - Additional Pumps and DC Gear
467t - 1930 FC
100t - Additional FC Equipment (Fire Control Center)
100t - NF Devices x 4 (space for radar)
25t - LR Radio
200t - Flag Facilities
10t - 2 x Catapult
50t - 2 x Armed Floatplane Aft

Decks are:  45mm Decapping/Initiating, 140mm Main, 15mm Splinter

[TacCovert4]

And a shift on the N-class.  Iteration after Iteration showed that it's just not reasonable to have 4 x 155/55s on a DD hull without sacrificing significantly.  A small ASW capability is added, as well as a fully capable AA suite and even a bridge expansion for a Squadron Commander and a couple of his personnel.  Lost is the aft superfiring 155 mount.

N-Class, Aztec Destroyer laid down 1938

Displacement:
   2,500 t light; 2,666 t standard; 2,859 t normal; 3,013 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (436.95 ft / 429.79 ft) x 39.76 ft x (11.05 / 11.51 ft)
   (133.18 m / 131.00 m) x 12.12 m  x (3.37 / 3.51 m)

Armament:
      3 - 6.10" / 155 mm 55.0 cal guns - 147.69lbs / 66.99kg shells, 350 per gun
     Dual purpose guns in deck and hoist mounts, 1938 Model
     3 x Single mounts on centreline ends, majority forward
      1 raised mount - superfiring
      8 - 1.57" / 40.0 mm 55.0 cal guns - 2.12lbs / 0.96kg shells, 2,000 per gun
     Anti-air guns in deck and hoist mounts, 1938 Model
     2 x 4 row quad mounts on centreline, evenly spread
      1 raised mount
      16 - 0.79" / 20.0 mm 55.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun
     Anti-air guns in deck mounts, 1938 Model
     16 x Single mounts on side ends, evenly spread
      Weight of broadside 464 lbs / 211 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.59" / 15 mm      0.59" / 15 mm
   2nd:   0.59" / 15 mm   0.59" / 15 mm      4.53" / 115 mm

   - Box over magazines:
   0.79" / 20 mm

   - Conning towers: Forward 0.79" / 20 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 59,850 shp / 44,648 Kw = 34.19 kts
   Range 3,800nm at 14.00 kts
   Bunker at max displacement = 346 tons

Complement:
   195 - 254

Cost:
   £1.890 million / $7.560 million

Distribution of weights at normal displacement:
   Armament: 136 tons, 4.8 %
      - Guns: 136 tons, 4.8 %
   Armour: 45 tons, 1.6 %
      - Armament: 23 tons, 0.8 %
      - Armour Deck: 19 tons, 0.6 %
      - Conning Tower: 3 tons, 0.1 %
   Machinery: 1,444 tons, 50.5 %
   Hull, fittings & equipment: 790 tons, 27.6 %
   Fuel, ammunition & stores: 359 tons, 12.6 %
   Miscellaneous weights: 84 tons, 2.9 %
      - Hull below water: 5 tons
      - Hull above water: 7 tons
      - On freeboard deck: 30 tons
      - Above deck: 42 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     787 lbs / 357 Kg = 6.9 x 6.1 " / 155 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 1.7 ft / 0.5 m
   Roll period: 12.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.60
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.530 / 0.536
   Length to Beam Ratio: 10.81 : 1
   'Natural speed' for length: 20.73 kts
   Power going to wave formation at top speed: 66 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  19.69 ft / 6.00 m,  18.04 ft / 5.50 m
      - Forward deck:   30.00 %,  18.04 ft / 5.50 m,  17.06 ft / 5.20 m
      - Aft deck:   35.00 %,  17.06 ft / 5.20 m,  17.06 ft / 5.20 m
      - Quarter deck:   15.00 %,  17.06 ft / 5.20 m,  17.06 ft / 5.20 m
      - Average freeboard:      17.54 ft / 5.35 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 180.8 %
      - Above water (accommodation/working, high = better): 197.7 %
   Waterplane Area: 11,706 Square feet or 1,088 Square metres
   Displacement factor (Displacement / loading): 74 %
   Structure weight / hull surface area: 40 lbs/sq ft or 196 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.46
      - Overall: 0.55
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room

14t - 1918 FC

5t - Basic Hydrophones

20t - 1x5x21in HW TT Centerline
10t - Depth Charges

25t - NF Devices
10t - Squadron Command Bridge Expansion

[Jefgte]

You can reduce the engines to 50% to improve seakeeping or misc weight...

6" guns on Destroyer hulls historically didn't fare so well for reasons Springsharp does not cover well.
Likewise 6" DP. ! 

I agree with Kaiser.

[TacCovert4]

You can reduce the engines to 50% to improve seakeeping or misc weight...

6" guns on Destroyer hulls historically didn't fare so well for reasons Springsharp does not cover well.
Likewise 6" DP. ! 

I agree with Kaiser.

Oh I agree as well.  This is a deliberate overreach by the RAN to have division leaders with serious punching power.  They'll discover that it's just not worth it and shift back to a more reasonable 5 or 6 120mm guns.

[TacCovert4]

A ship to supplement the ice-capable cruiser pair already in service:

Ice, Aztec Icebreaker-Corvette laid down 1938

Displacement:
   6,281 t light; 6,562 t standard; 7,086 t normal; 7,504 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (380.61 ft / 374.02 ft) x 65.62 ft x (18.04 / 18.89 ft)
   (116.01 m / 114.00 m) x 20.00 m  x (5.50 / 5.76 m)

Armament:
      4 - 6.10" / 155 mm 55.0 cal guns - 147.16lbs / 66.75kg shells, 150 per gun
     Dual purpose guns in deck and hoist mounts, 1938 Model
     2 x 2-gun mounts on centreline ends, evenly spread
      8 - 3.54" / 90.0 mm 55.0 cal guns - 24.01lbs / 10.89kg shells, 500 per gun
     Dual purpose guns in deck mounts, 1938 Model
     4 x Twin mounts on sides, evenly spread
      16 - 1.57" / 40.0 mm 50.0 cal guns - 2.07lbs / 0.94kg shells, 2,000 per gun
     Anti-air guns in deck mounts, 1938 Model
     8 x Twin mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 814 lbs / 369 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.94" / 100 mm   280.51 ft / 85.50 m   9.71 ft / 2.96 m
   Ends:   1.97" / 50 mm     93.47 ft / 28.49 m   9.71 ft / 2.96 m
     Main Belt covers 115 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.97" / 50 mm   280.51 ft / 85.50 m   16.67 ft / 5.08 m
   Beam between torpedo bulkheads 45.93 ft / 14.00 m

   - Hull void:
      0.00" / 0 mm     0.00 ft / 0.00 m   0.00 ft / 0.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.15" / 80 mm   1.57" / 40 mm      3.15" / 80 mm
   2nd:   2.36" / 60 mm   0.59" / 15 mm            -
   3rd:   0.59" / 15 mm   0.59" / 15 mm            -

   - Armoured deck - single deck:
   For and Aft decks: 1.97" / 50 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 3.15" / 80 mm, Aft 0.00" / 0 mm

Machinery:
   Diesel Internal combustion generators,
   Electric motors, 2 shafts, 40,700 shp / 30,362 Kw = 26.00 kts
   Range 6,000nm at 14.00 kts
   Bunker at max displacement = 942 tons

Complement:
   385 - 501

Cost:
   £2.515 million / $10.062 million

Distribution of weights at normal displacement:
   Armament: 215 tons, 3.0 %
      - Guns: 215 tons, 3.0 %
   Armour: 1,571 tons, 22.2 %
      - Belts: 525 tons, 7.4 %
      - Torpedo bulkhead: 341 tons, 4.8 %
      - Armament: 79 tons, 1.1 %
      - Armour Deck: 602 tons, 8.5 %
      - Conning Tower: 25 tons, 0.4 %
   Machinery: 1,114 tons, 15.7 %
   Hull, fittings & equipment: 2,248 tons, 31.7 %
   Fuel, ammunition & stores: 804 tons, 11.4 %
   Miscellaneous weights: 1,132 tons, 16.0 %
      - Hull below water: 700 tons
      - Hull void weights: 100 tons
      - Hull above water: 151 tons
      - On freeboard deck: 120 tons
      - Above deck: 61 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     13,489 lbs / 6,119 Kg = 118.7 x 6.1 " / 155 mm shells or 2.7 torpedoes
   Stability (Unstable if below 1.00): 1.33
   Metacentric height 4.4 ft / 1.3 m
   Roll period: 13.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 72 %
         - Recoil effect (Restricted arc if above 1.00): 0.15
   Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.560 / 0.566
   Length to Beam Ratio: 5.70 : 1
   'Natural speed' for length: 19.34 kts
   Power going to wave formation at top speed: 66 %
   Trim (Max stability = 0, Max steadiness = 100): 67
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   15.00 %,  24.61 ft / 7.50 m,  23.79 ft / 7.25 m
      - Forward deck:   30.00 %,  23.79 ft / 7.25 m,  21.33 ft / 6.50 m
      - Aft deck:   45.00 %,  21.33 ft / 6.50 m,  19.69 ft / 6.00 m
      - Quarter deck:   10.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      21.58 ft / 6.58 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 107.5 %
      - Above water (accommodation/working, high = better): 182.4 %
   Waterplane Area: 17,289 Square feet or 1,606 Square metres
   Displacement factor (Displacement / loading): 126 %
   Structure weight / hull surface area: 91 lbs/sq ft or 444 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 3.01
      - Overall: 1.02
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

BW
391t - Diesel Engines
279t - Electric Drives
30t - Additional Pumps

AW
100t - Enlarged Sick Bay and Berthing for Rescues
30t - Additional DC Equipment
15t - Dive Lockers

OD
60t - 2 x 15t Launch
40t - Aft Crane and Towing Equipment
20t - Minesweeping Equipment

AD
25t - NF Devices
25t - LR Radio

FC - 22t

Crash Void - 100t

Range at Cruise is 12,075nm

[TacCovert4]

Spent more time on the Gulf-type.  I can't get down to Byzance's size of cruiser for this similar concept without the tech that won't hit this turn.  But I can have a fairly robust ship. 

Gulf-Class, Aztec Frigate laid down 1938

Displacement:
   10,881 t light; 11,556 t standard; 12,759 t normal; 13,722 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (627.48 ft / 620.08 ft) x 71.36 ft x (18.86 / 19.97 ft)
   (191.26 m / 189.00 m) x 21.75 m  x (5.75 / 6.09 m)

Armament:
      12 - 6.10" / 155 mm 55.0 cal guns - 147.20lbs / 66.77kg shells, 300 per gun
     Dual purpose guns in turret on barbette mounts, 1938 Model
     4 x 3-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      12 - 3.54" / 90.0 mm 55.0 cal guns - 24.01lbs / 10.89kg shells, 400 per gun
     Dual purpose guns in deck mounts, 1938 Model
     6 x Twin mounts on sides, evenly spread
      16 - 1.57" / 40.0 mm 50.0 cal guns - 2.07lbs / 0.94kg shells, 3,000 per gun
     Anti-air guns in deck and hoist mounts, 1938 Model
     2 x 4 row quad mounts on sides, forward deck aft
      2 raised mounts
     2 x 4 row quad mounts on centreline ends, evenly spread
      2 double raised mounts
      20 - 0.79" / 20.0 mm 55.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun
     Anti-air guns in deck mounts, 1938 Model
     20 x Single mounts on sides, evenly spread
      Weight of broadside 2,093 lbs / 949 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.72" / 120 mm   421.65 ft / 128.52 m   13.12 ft / 4.00 m
   Ends:   1.77" / 45 mm   198.39 ft / 60.47 m   9.84 ft / 3.00 m
     Main Belt covers 105 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.18" / 30 mm   421.65 ft / 128.52 m   17.13 ft / 5.22 m
   Beam between torpedo bulkheads 54.13 ft / 16.50 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5.51" / 140 mm   2.99" / 76 mm      4.72" / 120 mm
   2nd:   2.76" / 70 mm   1.57" / 40 mm            -
   3rd:   0.79" / 20 mm   0.79" / 20 mm      0.79" / 20 mm
   4th:   0.59" / 15 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.44" / 62 mm
   Forecastle: 1.18" / 30 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 3.15" / 80 mm, Aft 3.15" / 80 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 77,486 shp / 57,804 Kw = 30.00 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 2,166 tons

Complement:
   599 - 780

Cost:
   £4.906 million / $19.624 million

Distribution of weights at normal displacement:
   Armament: 621 tons, 4.9 %
      - Guns: 621 tons, 4.9 %
   Armour: 3,400 tons, 26.6 %
      - Belts: 1,210 tons, 9.5 %
      - Torpedo bulkhead: 316 tons, 2.5 %
      - Armament: 531 tons, 4.2 %
      - Armour Deck: 1,269 tons, 9.9 %
      - Conning Towers: 74 tons, 0.6 %
   Machinery: 2,122 tons, 16.6 %
   Hull, fittings & equipment: 4,502 tons, 35.3 %
   Fuel, ammunition & stores: 1,878 tons, 14.7 %
   Miscellaneous weights: 237 tons, 1.9 %
      - Hull above water: 31 tons
      - On freeboard deck: 100 tons
      - Above deck: 106 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     21,285 lbs / 9,655 Kg = 187.3 x 6.1 " / 155 mm shells or 3.7 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 3.7 ft / 1.1 m
   Roll period: 15.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.34
   Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.535 / 0.543
   Length to Beam Ratio: 8.69 : 1
   'Natural speed' for length: 24.90 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 68
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   18.00 %,  20.34 ft / 6.20 m,  20.34 ft / 6.20 m
      - Forward deck:   30.00 %,  20.34 ft / 6.20 m,  18.04 ft / 5.50 m
      - Aft deck:   38.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Quarter deck:   14.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Average freeboard:      18.80 ft / 5.73 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 93.8 %
      - Above water (accommodation/working, high = better): 179.6 %
   Waterplane Area: 30,450 Square feet or 2,829 Square metres
   Displacement factor (Displacement / loading): 131 %
   Structure weight / hull surface area: 113 lbs/sq ft or 550 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.03
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

40t - 2 x 5 x 21in HW TT on sides aft
60t - 2 x Catapult and 2 x Armed floatplane

25t - LR Wireless
50t - NF Devices x 2
62t - 1918 FC

[TacCovert4]

Looking at 1939, when the new Cruiser tech becomes available.  There have been a lot of 'emergency program' cruisers built over the years, including the Eagles, Towns, etc.  And most of them, are in need of either a major refit, or a replacement.  The Towns and Eagles would both need VERY deep refits, and honestly wouldn't be worth it for the amount of work being put into those hulls, better to use them as is for secondary roles until it's time to scrap the remaining ships of those classes.

Instead, a new 'light corvette' type is in the works, a type to replace all of the older ships with one that combines adequate speed, range, and other capabilities for escort work, with a modern AA suite, modern fire control and even space for the newfangled 'radar' if it's ever turned into something you can mount on a ship this size.

Mountain-class, Aztec Corvette laid down 1939

Displacement:
   5,558 t light; 5,891 t standard; 6,551 t normal; 7,078 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (532.10 ft / 524.93 ft) x 54.13 ft x (15.22 / 16.15 ft)
   (162.18 m / 160.00 m) x 16.50 m  x (4.64 / 4.92 m)

Armament:
      8 - 6.10" / 155 mm 55.0 cal guns - 122.64lbs / 55.63kg shells, 250 per gun
     Dual purpose guns in deck and hoist mounts, 1939 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      8 - 3.54" / 90.0 mm 55.0 cal guns - 24.01lbs / 10.89kg shells, 400 per gun
     Dual purpose guns in deck mounts, 1939 Model
     4 x Twin mounts on sides, evenly spread
      8 - 1.57" / 40.0 mm 50.0 cal guns - 2.07lbs / 0.94kg shells, 2,000 per gun
     Anti-air guns in deck and hoist mounts, 1939 Model
     2 x 4 row quad mounts on centreline, evenly spread
      2 double raised mounts
      16 - 0.79" / 20.0 mm 55.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun
     Anti-air guns in deck mounts, 1939 Model
     16 x Single mounts on sides, evenly spread
      Weight of broadside 1,194 lbs / 542 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.15" / 80 mm   356.96 ft / 108.80 m   9.84 ft / 3.00 m
   Ends:   Unarmoured
     Main Belt covers 105 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      0.98" / 25 mm   356.96 ft / 108.80 m   14.83 ft / 4.52 m
   Beam between torpedo bulkheads 45.93 ft / 14.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   4.72" / 120 mm   2.95" / 75 mm      4.33" / 110 mm
   2nd:   2.36" / 60 mm   1.57" / 40 mm            -
   3rd:   0.98" / 25 mm   0.98" / 25 mm      0.98" / 25 mm
   4th:   0.59" / 15 mm         -               -

   - Box over machinery & magazines:
   2.95" / 75 mm

   - Conning towers: Forward 3.15" / 80 mm, Aft 3.15" / 80 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 49,892 shp / 37,219 Kw = 30.00 kts
   Range 8,000nm at 14.00 kts
   Bunker at max displacement = 1,187 tons

Complement:
   363 - 473

Cost:
   £2.974 million / $11.898 million

Distribution of weights at normal displacement:
   Armament: 386 tons, 5.9 %
      - Guns: 386 tons, 5.9 %
   Armour: 1,829 tons, 27.9 %
      - Belts: 454 tons, 6.9 %
      - Torpedo bulkhead: 193 tons, 2.9 %
      - Armament: 185 tons, 2.8 %
      - Armour Deck: 950 tons, 14.5 %
      - Conning Towers: 48 tons, 0.7 %
   Machinery: 1,350 tons, 20.6 %
   Hull, fittings & equipment: 1,810 tons, 27.6 %
   Fuel, ammunition & stores: 992 tons, 15.1 %
   Miscellaneous weights: 184 tons, 2.8 %
      - Hull above water: 20 tons
      - On freeboard deck: 70 tons
      - Above deck: 94 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     7,415 lbs / 3,363 Kg = 65.3 x 6.1 " / 155 mm shells or 1.7 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 2.5 ft / 0.8 m
   Roll period: 14.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.46
   Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and small transom stern
   Block coefficient (normal/deep): 0.530 / 0.540
   Length to Beam Ratio: 9.70 : 1
   'Natural speed' for length: 24.57 kts
   Power going to wave formation at top speed: 56 %
   Trim (Max stability = 0, Max steadiness = 100): 57
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   18.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Forward deck:   30.00 %,  19.69 ft / 6.00 m,  16.40 ft / 5.00 m
      - Aft deck:   38.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Quarter deck:   14.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Average freeboard:      17.49 ft / 5.33 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 102.9 %
      - Above water (accommodation/working, high = better): 179.2 %
   Waterplane Area: 19,939 Square feet or 1,852 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 68 lbs/sq ft or 334 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.73
      - Longitudinal: 0.91
      - Overall: 0.75
   Caution: Hull subject to strain in open-sea
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room

40t - 2 x 5 x 21in HW TT on sides aft
30t - 1 x Catapult and 1 x Armed floatplane

25t - LR Wireless
50t - NF Devices x 2
39t - FC

[Kaiser Kirk]

On the Mountain class.. it's the same tonnage battle I keep fighting with my Boran/Tomyris class frigates,
but a 25mm bulkhead 1.25m inside the hull will stop progressive flooding from leaks from near-misses, but really lacks the depth for more.

I'd also be curious what the rotating weight of one of those gun houses is in a M&H system without any power assist....hmm 114tons. Take Omaha's tinplated 6"/53s twins at 51.8t while the 5.25"DP on KGV was 77t and slow.
So 114 with or without Power Assist, that's likely slow to train. Ironically a turret is only 120t and so would be cheaper than M&H with PA.

Going back quite a ways - on the Gulf class 12x155mm cruiser, does the TDS actually help much?
With a 2.5m depth on either side, and only 30mm, it's not robust, but it's 10% of the armor weight.

Also, 0.5m could be added to the bow and might help that wet forward.

Lastly, dropping to 10,000 gets you 0.9 hull with the final cruiser tech, which might mean minor sacrifices to get down.

[TacCovert4]

On the Mountain class.. it's the same tonnage battle I keep fighting with my Boran/Tomyris class frigates,
but a 25mm bulkhead 1.25m inside the hull will stop progressive flooding from leaks from near-misses, but really lacks the depth for more.

I'd also be curious what the rotating weight of one of those gun houses is in a M&H system without any power assist....hmm 114tons. Take Omaha's tinplated 6"/53s twins at 51.8t while the 5.25"DP on KGV was 77t and slow.
So 114 with or without Power Assist, that's likely slow to train. Ironically a turret is only 120t and so would be cheaper than M&H with PA.

Going back quite a ways - on the Gulf class 12x155mm cruiser, does the TDS actually help much?
With a 2.5m depth on either side, and only 30mm, it's not robust, but it's 10% of the armor weight.

Also, 0.5m could be added to the bow and might help that wet forward.

Lastly, dropping to 10,000 gets you 0.9 hull with the final cruiser tech, which might mean minor sacrifices to get down.

You have some points.  Definitely some issues with weights on stuff.  Hmm, I didn't review the difference on weights as much, probably should have developed the 155 with a twin and triple turret instead of a twin m&h.

I tend to put a TDS on stuff, it might not be strictly necessary, but then it's kind of become the norm.  I'll play around with them some more though.

The Gulf's TDS takes it from 2.8 torpedoes to 3.7.  I think that's actually enough to be the difference between a torpedo hit being 'pull out all the stops to save the ship' and 'we need to take her into port but she can finish the immediate fight'.  Or an air dropped torpedo being something that puts the ship immediately in drydock or something that can be partially repaired at an atoll by a salvage ship and pumped out.