Aztec Ship Designs 1918-1920

[TacCovert4]

Fixed the errors.  In fixing the errors I wound up gaining some more comp, so I added a half-knot of speed and made a few more adjustments.

Azteca, Aztec Battleship laid down 1919

Displacement:
   63,624 t light; 66,764 t standard; 71,136 t normal; 74,633 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (819.51 ft / 816.93 ft) x 131.23 ft (Bulges 144.36 ft) x (32.48 / 33.97 ft)
   (249.79 m / 249.00 m) x 40.00 m (Bulges 44.00 m)  x (9.90 / 10.35 m)

Armament:
      18 - 14.17" / 360 mm 45.0 cal guns - 1,435.69lbs / 651.22kg shells, 100 per gun
     Breech loading guns in turret on barbette mounts, 1919 Model
     4 x 3-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     2 x 3-gun mounts on centreline, evenly spread
      32 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1919 Model
     16 x Twin mounts on sides, evenly spread
      6 raised mounts
      12 - 2.76" / 70.0 mm 50.0 cal guns - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1919 Model
     12 x Single mounts on centreline, evenly spread
      12 raised mounts
      60 - 0.47" / 12.0 mm 70.0 cal guns - 0.07lbs / 0.03kg shells, 3,000 per gun
     Machine guns in deck mounts, 1919 Model
     30 x Twin mounts on sides, evenly spread
      Weight of broadside 28,250 lbs / 12,814 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   15.7" / 400 mm   531.00 ft / 161.85 m   19.69 ft / 6.00 m
   Ends:   5.91" / 150 mm   285.89 ft / 87.14 m   19.69 ft / 6.00 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      3.94" / 100 mm   531.00 ft / 161.85 m   36.09 ft / 11.00 m
   Beam between torpedo bulkheads 98.43 ft / 30.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   15.7" / 400 mm   5.91" / 150 mm      15.7" / 400 mm
   2nd:   3.94" / 100 mm   2.76" / 70 mm      3.94" / 100 mm

   - Armoured deck - multiple decks:
   For and Aft decks: 5.51" / 140 mm
   Forecastle: 3.15" / 80 mm  Quarter deck: 4.72" / 120 mm

   - Conning towers: Forward 15.75" / 400 mm, Aft 15.75" / 400 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 160,115 shp / 119,446 Kw = 27.50 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 7,870 tons

Complement:
   2,177 - 2,831

Cost:
   £12.397 million / $49.589 million

Distribution of weights at normal displacement:
   Armament: 5,928 tons, 8.3 %
      - Guns: 5,928 tons, 8.3 %
   Armour: 26,822 tons, 37.7 %
      - Belts: 8,498 tons, 11.9 %
      - Torpedo bulkhead: 2,792 tons, 3.9 %
      - Armament: 6,365 tons, 8.9 %
      - Armour Deck: 8,002 tons, 11.2 %
      - Conning Towers: 1,165 tons, 1.6 %
   Machinery: 5,686 tons, 8.0 %
   Hull, fittings & equipment: 22,651 tons, 31.8 %
   Fuel, ammunition & stores: 7,512 tons, 10.6 %
   Miscellaneous weights: 2,538 tons, 3.6 %
      - Hull below water: 1,571 tons
      - Hull above water: 300 tons
      - On freeboard deck: 192 tons
      - Above deck: 475 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     111,001 lbs / 50,349 Kg = 78.0 x 14.2 " / 360 mm shells or 23.9 torpedoes
   Stability (Unstable if below 1.00): 1.23
   Metacentric height 10.9 ft / 3.3 m
   Roll period: 18.3 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): 0.650 / 0.652
   Length to Beam Ratio: 5.66 : 1
   'Natural speed' for length: 28.58 kts
   Power going to wave formation at top speed: 51 %
   Trim (Max stability = 0, Max steadiness = 100): 66
   Bow angle (Positive = bow angles forward): 5.00 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,  26.25 ft / 8.00 m
      - Forward deck:   30.00 %,  26.25 ft / 8.00 m,  22.97 ft / 7.00 m
      - Aft deck:   35.00 %,  22.97 ft / 7.00 m,  22.97 ft / 7.00 m
      - Quarter deck:   15.00 %,  22.97 ft / 7.00 m,  22.97 ft / 7.00 m
      - Average freeboard:      24.38 ft / 7.43 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 84.4 %
      - Above water (accommodation/working, high = better): 170.5 %
   Waterplane Area: 82,128 Square feet or 7,630 Square metres
   Displacement factor (Displacement / loading): 108 %
   Structure weight / hull surface area: 234 lbs/sq ft or 1,140 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.11
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

1421t - Electric Drives
600t - 1918 FC
25t - LR Wireless
50t - NF Devices x 2
100t - Flag Facilities
192t - Electric T&E for Secondary Battery
150t - Additional Damage Control Equipment

[TacCovert4]

There's also this slightly smaller version:

Azteca, Aztec Battleship laid down 1919

Displacement:
   57,079 t light; 60,079 t standard; 64,146 t normal; 67,400 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (819.67 ft / 816.93 ft) x 131.23 ft x (32.22 / 33.60 ft)
   (249.83 m / 249.00 m) x 40.00 m  x (9.82 / 10.24 m)

Armament:
      18 - 14.17" / 360 mm 45.0 cal guns - 1,435.69lbs / 651.22kg shells, 100 per gun
     Breech loading guns in turret on barbette mounts, 1919 Model
     4 x 3-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     2 x 3-gun mounts on centreline, evenly spread
      32 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1919 Model
     16 x Twin mounts on sides, evenly spread
      6 raised mounts
      12 - 2.76" / 70.0 mm 50.0 cal guns - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1919 Model
     12 x Single mounts on centreline, evenly spread
      12 raised mounts
      60 - 0.47" / 12.0 mm 70.0 cal guns - 0.07lbs / 0.03kg shells, 3,000 per gun
     Machine guns in deck mounts, 1919 Model
     30 x Twin mounts on sides, evenly spread
      Weight of broadside 28,250 lbs / 12,814 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   15.7" / 400 mm   531.00 ft / 161.85 m   16.40 ft / 5.00 m
   Ends:   5.91" / 150 mm   285.89 ft / 87.14 m   16.40 ft / 5.00 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      3.54" / 90 mm   531.00 ft / 161.85 m   31.50 ft / 9.60 m
   Beam between torpedo bulkheads 98.43 ft / 30.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   15.7" / 400 mm   5.91" / 150 mm      15.7" / 400 mm
   2nd:   3.15" / 80 mm   1.57" / 40 mm      3.15" / 80 mm

   - Armoured deck - multiple decks:
   For and Aft decks: 5.51" / 140 mm
   Forecastle: 2.76" / 70 mm  Quarter deck: 4.72" / 120 mm

   - Conning towers: Forward 7.87" / 200 mm, Aft 7.87" / 200 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 137,350 shp / 102,463 Kw = 27.00 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 7,321 tons

Complement:
   2,014 - 2,619

Cost:
   £11.650 million / $46.602 million

Distribution of weights at normal displacement:
   Armament: 5,928 tons, 9.2 %
      - Guns: 5,928 tons, 9.2 %
   Armour: 23,605 tons, 36.8 %
      - Belts: 7,071 tons, 11.0 %
      - Torpedo bulkhead: 2,193 tons, 3.4 %
      - Armament: 5,850 tons, 9.1 %
      - Armour Deck: 7,949 tons, 12.4 %
      - Conning Towers: 544 tons, 0.8 %
   Machinery: 4,877 tons, 7.6 %
   Hull, fittings & equipment: 20,494 tons, 31.9 %
   Fuel, ammunition & stores: 7,067 tons, 11.0 %
   Miscellaneous weights: 2,175 tons, 3.4 %
      - Hull below water: 1,400 tons
      - Hull above water: 300 tons
      - Above deck: 475 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     92,899 lbs / 42,138 Kg = 65.3 x 14.2 " / 360 mm shells or 17.8 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 9.9 ft / 3.0 m
   Roll period: 17.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.47
   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): 0.650 / 0.655
   Length to Beam Ratio: 6.23 : 1
   'Natural speed' for length: 28.58 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 66
   Bow angle (Positive = bow angles forward): 5.00 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 %,  31.30 ft / 9.54 m,  25.62 ft / 7.81 m
      - Forward deck:   30.00 %,  25.62 ft / 7.81 m,  19.91 ft / 6.07 m
      - Aft deck:   35.00 %,  19.91 ft / 6.07 m,  19.91 ft / 6.07 m
      - Quarter deck:   15.00 %,  19.91 ft / 6.07 m,  19.91 ft / 6.07 m
      - Average freeboard:      22.37 ft / 6.82 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 87.5 %
      - Above water (accommodation/working, high = better): 164.9 %
   Waterplane Area: 82,128 Square feet or 7,630 Square metres
   Displacement factor (Displacement / loading): 105 %
   Structure weight / hull surface area: 223 lbs/sq ft or 1,091 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.01
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

1231t - Electric Drives
600t - 1918 FC
25t - LR Wireless
50t - NF Devices x 2
100t - Flag Facilities
169t - Additional Subdivision and Pumps

[TacCovert4]

And then there's This little guy......note that the secondary batteries have electric powered Traverse and Elevation due to their armor protection being somewhat stout to move by hand.

Azteca, Aztec Battleship laid down 1919

Displacement:
   70,889 t light; 74,438 t standard; 79,040 t normal; 82,721 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (819.51 ft / 816.93 ft) x 131.23 ft (Bulges 144.36 ft) x (36.09 / 37.66 ft)
   (249.79 m / 249.00 m) x 40.00 m (Bulges 44.00 m)  x (11.00 / 11.48 m)

Armament:
      18 - 14.17" / 360 mm 45.0 cal guns - 1,435.69lbs / 651.22kg shells, 100 per gun
     Breech loading guns in turret on barbette mounts, 1919 Model
     4 x 3-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     2 x 3-gun mounts on centreline, evenly spread
      32 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1919 Model
     16 x Twin mounts on sides, evenly spread
      6 raised mounts
      12 - 2.76" / 70.0 mm 50.0 cal guns - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1919 Model
     12 x Single mounts on centreline, evenly spread
      12 raised mounts
      60 - 0.47" / 12.0 mm 70.0 cal guns - 0.07lbs / 0.03kg shells, 3,000 per gun
     Machine guns in deck mounts, 1919 Model
     30 x Twin mounts on sides, evenly spread
      16 - 7.09" / 180 mm 50.0 cal guns - 188.39lbs / 85.45kg shells, 150 per gun
     Breech loading guns in casemate mounts, 1919 Model
     16 x Single mounts on sides, evenly spread
      16 hull mounts in casemates- Limited use in heavy seas
      Weight of broadside 31,265 lbs / 14,181 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   15.7" / 400 mm   531.00 ft / 161.85 m   18.04 ft / 5.50 m
   Ends:   7.09" / 180 mm   285.89 ft / 87.14 m   18.04 ft / 5.50 m
   Upper:   11.8" / 300 mm   531.00 ft / 161.85 m   16.40 ft / 5.00 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      4.72" / 120 mm   531.00 ft / 161.85 m   31.50 ft / 9.60 m
   Beam between torpedo bulkheads 98.43 ft / 30.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   15.7" / 400 mm   5.91" / 150 mm      15.7" / 400 mm
   2nd:   3.94" / 100 mm   1.97" / 50 mm      3.94" / 100 mm
   5th:   11.8" / 300 mm   6.69" / 170 mm            -

   - Armoured deck - multiple decks:
   For and Aft decks: 6.69" / 170 mm
   Forecastle: 3.15" / 80 mm  Quarter deck: 5.12" / 130 mm

   - Conning towers: Forward 15.75" / 400 mm, Aft 15.75" / 400 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 157,472 shp / 117,474 Kw = 27.00 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 8,283 tons

Complement:
   2,356 - 3,064

Cost:
   £13.267 million / $53.067 million

Distribution of weights at normal displacement:
   Armament: 6,419 tons, 8.1 %
      - Guns: 6,419 tons, 8.1 %
   Armour: 33,389 tons, 42.2 %
      - Belts: 12,558 tons, 15.9 %
      - Torpedo bulkhead: 2,924 tons, 3.7 %
      - Armament: 7,127 tons, 9.0 %
      - Armour Deck: 9,532 tons, 12.1 %
      - Conning Towers: 1,250 tons, 1.6 %
   Machinery: 5,592 tons, 7.1 %
   Hull, fittings & equipment: 22,916 tons, 29.0 %
   Fuel, ammunition & stores: 8,150 tons, 10.3 %
   Miscellaneous weights: 2,573 tons, 3.3 %
      - Hull below water: 1,400 tons
      - Hull above water: 486 tons
      - On freeboard deck: 192 tons
      - Above deck: 495 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     130,021 lbs / 58,977 Kg = 91.3 x 14.2 " / 360 mm shells or 28.5 torpedoes
   Stability (Unstable if below 1.00): 1.24
   Metacentric height 11.1 ft / 3.4 m
   Roll period: 18.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.37
   Seaboat quality  (Average = 1.00): 1.19

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.650 / 0.652
   Length to Beam Ratio: 5.66 : 1
   'Natural speed' for length: 28.58 kts
   Power going to wave formation at top speed: 51 %
   Trim (Max stability = 0, Max steadiness = 100): 59
   Bow angle (Positive = bow angles forward): 5.00 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,  26.25 ft / 8.00 m
      - Forward deck:   30.00 %,  26.25 ft / 8.00 m,  24.61 ft / 7.50 m
      - Aft deck:   35.00 %,  24.61 ft / 7.50 m,  24.61 ft / 7.50 m
      - Quarter deck:   15.00 %,  24.61 ft / 7.50 m,  24.61 ft / 7.50 m
      - Average freeboard:      25.44 ft / 7.76 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 78.4 %
      - Above water (accommodation/working, high = better): 165.9 %
   Waterplane Area: 82,128 Square feet or 7,630 Square metres
   Displacement factor (Displacement / loading): 107 %
   Structure weight / hull surface area: 232 lbs/sq ft or 1,134 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.24
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

1231t - Electric Drives
642t - 1918 FC
25t - LR Wireless
50t - NF Devices x 2
100t - Flag Facilities
169t - Additional Subdivision and Pumps
160t - Electric T&E for 180mm Battery
192t - Electric T&E for 130mm Battery

[Desertfox]

Needs more guns. Only 18 on 70k? Pathetic...

You can just sail it into Havana and park it there. Dare the Roman fleet to come get it.

[Jefgte]

Needs more guns. Only 18 on 70k?

The shielding is particularly excessive => 42%
I think the ship is not well balanced.
Arming - speed - protection.

With 70BP, I could build 2,3 or 4 BB with 30x360mm... & a better strategical & tactical use.

[TacCovert4]

There is a bit of "could we" not "should we " at play.

[The Rock Doctor]

There is a bit of "could we" not "should we " at play.

Thanks to those scientists at Jurassic Park focusing on the "Could we", we have a whole franchise to enjoy.

[TacCovert4]

Oh quite.  And yes, that last design was just ridiculous.  I mean a 12in upper belt?  That's basically protection against 340s at combat ranges for the entire hull. 

[TacCovert4]

Inspired by the Vilnius Union's various attempts to find the 'ideal' destroyer.  This is a potential, aka projected, early 1920s fleet destroyer, primarily for operations in the Caribbean.  Of note is that the number of gun mounts have been reduced from 5 on the D class to 4, eliminating the always iffy Q turret.  However, guns have increased from 5 to 8 through the use of the smaller twin 100mm gun instead of the single 130mm gun.  ASW 'for but not with' is the same in anticipation of ASW kit being properly available soon.  Also the torpedo armament has been increased from a pair of treble launchers to a pair of quad launchers, giving it a weighty 8 torpedo broadside.  Range has also increased.  Primarily the increases have come at the expense of the change to the guns, though 100mm is a fast loading round with plenty of range for most anticipated battle situations, and maybe it is getting the most hits in rather than the first big hits, that matters in the small craft engagement?


DD-F, Aztec Destroyer laid down 1920

Displacement:
   1,500 t light; 1,582 t standard; 1,826 t normal; 2,021 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (392.53 ft / 387.96 ft) x 32.28 ft x (12.01 / 12.88 ft)
   (119.64 m / 118.25 m) x 9.84 m  x (3.66 / 3.93 m)

Armament:
      8 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 300 per gun
     Quick firing guns in deck mounts, 1920 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      1 - 2.76" / 70.0 mm 50.0 cal gun - 11.08lbs / 5.03kg shells, 300 per gun
     Anti-air gun in deck mount, 1920 Model
     1 x Single mount on centreline, forward deck aft
      1 raised mount
      8 - 0.47" / 12.0 mm 70.0 cal guns - 0.06lbs / 0.03kg shells, 3,000 per gun
     Machine guns in deck mounts, 1920 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 270 lbs / 122 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm         -               -

   - Conning towers: Forward 0.98" / 25 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 36,280 shp / 27,065 Kw = 32.69 kts
   Range 5,500nm at 14.00 kts
   Bunker at max displacement = 439 tons

Complement:
   139 - 181

Cost:
   £0.484 million / $1.934 million

Distribution of weights at normal displacement:
   Armament: 46 tons, 2.5 %
      - Guns: 46 tons, 2.5 %
   Armour: 12 tons, 0.7 %
      - Armament: 9 tons, 0.5 %
      - Conning Tower: 3 tons, 0.2 %
   Machinery: 981 tons, 53.7 %
   Hull, fittings & equipment: 413 tons, 22.6 %
   Fuel, ammunition & stores: 326 tons, 17.9 %
   Miscellaneous weights: 48 tons, 2.6 %
      - Hull below water: 5 tons
      - Hull above water: 2 tons
      - On freeboard deck: 38 tons
      - Above deck: 3 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     417 lbs / 189 Kg = 13.7 x 3.9 " / 100 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.30
   Metacentric height 1.5 ft / 0.4 m
   Roll period: 11.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 72 %
         - Recoil effect (Restricted arc if above 1.00): 0.30
   Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.425 / 0.439
   Length to Beam Ratio: 12.02 : 1
   'Natural speed' for length: 19.70 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   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:   20.00 %,  17.06 ft / 5.20 m,  17.06 ft / 5.20 m
      - Forward deck:   30.00 %,  17.06 ft / 5.20 m,  17.06 ft / 5.20 m
      - Aft deck:   35.00 %,  8.53 ft / 2.60 m,  8.53 ft / 2.60 m
      - Quarter deck:   15.00 %,  8.53 ft / 2.60 m,  8.53 ft / 2.60 m
      - Average freeboard:      12.80 ft / 3.90 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 183.2 %
      - Above water (accommodation/working, high = better): 133.9 %
   Waterplane Area: 7,836 Square feet or 728 Square metres
   Displacement factor (Displacement / loading): 67 %
   Structure weight / hull surface area: 30 lbs/sq ft or 147 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.99
      - Overall: 0.53
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

32t - 2 x 4 x 21in HW TT on Centerline
6t - 60 x ASW Harpoons and Lockers (planned for refit to other ASW weapons at future date)

5t - 1912 FC
5t - Space Set Aside for Hydrophones

[TacCovert4]

An alternative design.  A dedicated gunboat-torpedoboat Destroyer without ASW capabilities.  But it runs single 130mm guns superfiring over twins fore and aft, with an upgraded AA suite.

DD-D, Aztec Destroyer laid down 1920

Displacement:
   1,500 t light; 1,588 t standard; 1,833 t normal; 2,028 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (393.69 ft / 388.94 ft) x 32.28 ft x (11.81 / 12.68 ft)
   (120.00 m / 118.55 m) x 9.84 m  x (3.60 / 3.86 m)

Armament:
      4 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1920 Model
     2 x Twin mounts on centreline ends, evenly spread
      2 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck mounts, 1920 Model
     2 x Single mounts on centreline ends, evenly spread
      2 raised mounts
      2 - 2.76" / 70.0 mm 50.0 cal guns - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1920 Model
     2 x Single mounts on centreline, evenly spread
      2 raised mounts
      8 - 0.47" / 12.0 mm 70.0 cal guns - 0.07lbs / 0.03kg shells, 3,000 per gun
     Machine guns in deck mounts, 1920 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 449 lbs / 203 kg

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 33,354 shp / 24,882 Kw = 32.00 kts
   Range 5,500nm at 14.00 kts
   Bunker at max displacement = 440 tons

Complement:
   139 - 182

Cost:
   £0.515 million / $2.060 million

Distribution of weights at normal displacement:
   Armament: 101 tons, 5.5 %
      - Guns: 101 tons, 5.5 %
   Machinery: 903 tons, 49.3 %
   Hull, fittings & equipment: 454 tons, 24.8 %
   Fuel, ammunition & stores: 333 tons, 18.2 %
   Miscellaneous weights: 42 tons, 2.3 %
      - Hull above water: 5 tons
      - On freeboard deck: 32 tons
      - Above deck: 5 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     424 lbs / 193 Kg = 6.3 x 5.1 " / 130 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.17
   Metacentric height 1.2 ft / 0.4 m
   Roll period: 12.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.79
   Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.433 / 0.446
   Length to Beam Ratio: 12.05 : 1
   'Natural speed' for length: 19.72 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 68
   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:   20.00 %,  17.72 ft / 5.40 m,  17.22 ft / 5.25 m
      - Forward deck:   30.00 %,  17.22 ft / 5.25 m,  17.22 ft / 5.25 m
      - Aft deck:   35.00 %,  8.53 ft / 2.60 m,  8.53 ft / 2.60 m
      - Quarter deck:   15.00 %,  8.53 ft / 2.60 m,  8.53 ft / 2.60 m
      - Average freeboard:      12.92 ft / 3.94 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 179.9 %
      - Above water (accommodation/working, high = better): 135.8 %
   Waterplane Area: 7,900 Square feet or 734 Square metres
   Displacement factor (Displacement / loading): 67 %
   Structure weight / hull surface area: 34 lbs/sq ft or 168 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.08
      - Overall: 0.54
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

32t - 2 x 4 x 21in HW TT on Centerline


10t - 1912 FC

[Kaiser Kirk]

I confess to finding it interesting the gap between our 1920 designs and "Real World" designs interesting.
I wonder how much is how we SS DD's and how much hindsight effects our idea of what's needed.

Still, fun to see the designs.

[TacCovert4]

I confess to finding it interesting the gap between our 1920 designs and "Real World" designs interesting.
I wonder how much is how we SS DD's and how much hindsight effects our idea of what's needed.

Still, fun to see the designs.

Some is probably hindsight inspiring us.   For instance I should be building Clemson's.....but I just did a run of basically fletcher. 

However,  I think that in game things, like subs being a slow burn, have affected the destroyers dynamic.  Nobody post ww1 would have looked at a destroyer without asw.  And the lack of a WNT is affecting the cruiser situation rather drastically.   

[TacCovert4]

In other ways it's driving innovation.   Who builds almost the penultimate example of the ww2 Era all round destroyer...and immediately goes about trying to improve on it....in 1920? 

[Kaiser Kirk]

I think part may be the 'powers' didn't need to expand that much in the 20s.
Most had built plenty of Destroyers for WWI, and didn't need new ones.
Further, what they built was likely the near-minimum, as they wanted many.

Here, we don't have that constraint, so we're rushing towards large destroyers,
valuing the best individual unit within the tech constraints.

but are 2 x 1500 ton DDs "better" than 3x 1000 ton ?  or 4x 750t? 

[Desertfox]

The Fubukis were groundbreaking designs... in 1926. Here I'm planning near equivalents in 1920, and they aren't groundbreaking merely state of the art.

I think a big reason is the rules between destroyers and cruisers mean a 1,500t destroyer is basically as good as a 3,000t cruiser, so you get a lot more bang for your buck. So we are replacing a lot of the historical PCs and LCs with big destroyers. Also destroyers here have proven to be devastatingly effective both against capital ships and in defending capital ships, while cruisers... not so much.

Note that Japan basically built a ton of ~750t destroyers going for quantity over quality, but is now switching to bigger 1,500t ones due to oceanic requirements.