Aztec Ships and Refits, 1914-1915

[snip]

Way to narrow for a proper TDS. Drop it and add other armor or make her faster.

[TacCovert4]

Eh, it's not the best.  But a retaining bulkhead at 1.6m depth is better than nothing.   And if the ship is bulged during a mid life rebuild, the bulkhead is already there.

[TacCovert4]

But in the interest of having some TDS.....fiddled a bit more.

CL-2, Aztec Light Cruiser laid down 1915

Displacement:
   8,996 t light; 9,357 t standard; 10,575 t normal; 11,549 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (590.49 ft / 580.71 ft) x 59.81 ft x (19.03 / 20.42 ft)
   (179.98 m / 177.00 m) x 18.23 m  x (5.80 / 6.22 m)

Armament:
      8 - 7.09" / 180 mm 50.0 cal guns - 188.39lbs / 85.45kg shells, 140 per gun
     Breech loading guns in deck and hoist mounts, 1915 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      8 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 200 per gun
     Quick firing guns in deck mounts, 1915 Model
     8 x Single mounts on sides, evenly spread
      2 - 2.76" / 70.0 mm 50.0 cal guns - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1915 Model
     2 x Single mounts on centreline, evenly spread
      2 raised mounts
      8 - 0.31" / 8.0 mm 70.0 cal guns - 0.02lbs / 0.01kg shells, 1,500 per gun
     Machine guns in deck mounts, 1915 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 1,788 lbs / 811 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.94" / 100 mm   524.93 ft / 160.00 m   9.84 ft / 3.00 m
   Ends:   1.97" / 50 mm     55.77 ft / 17.00 m   9.84 ft / 3.00 m
     Main Belt covers 139 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.18" / 30 mm   442.91 ft / 135.00 m   17.36 ft / 5.29 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   1.97" / 50 mm      4.72" / 120 mm
   2nd:   2.56" / 65 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 1.97" / 50 mm
   Forecastle: 0.00" / 0 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 2.76" / 70 mm, Aft 2.76" / 70 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 70,145 shp / 52,329 Kw = 30.00 kts
   Range 8,000nm at 14.00 kts
   Bunker at max displacement = 2,192 tons

Complement:
   520 - 677

Cost:
   £1.250 million / $5.001 million

Distribution of weights at normal displacement:
   Armament: 496 tons, 4.7 %
      - Guns: 496 tons, 4.7 %
   Armour: 2,166 tons, 20.5 %
      - Belts: 836 tons, 7.9 %
      - Torpedo bulkhead: 336 tons, 3.2 %
      - Armament: 154 tons, 1.5 %
      - Armour Deck: 784 tons, 7.4 %
      - Conning Towers: 57 tons, 0.5 %
   Machinery: 2,657 tons, 25.1 %
   Hull, fittings & equipment: 3,511 tons, 33.2 %
   Fuel, ammunition & stores: 1,579 tons, 14.9 %
   Miscellaneous weights: 165 tons, 1.6 %
      - On freeboard deck: 88 tons
      - Above deck: 77 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     13,588 lbs / 6,163 Kg = 76.4 x 7.1 " / 180 mm shells or 2.0 torpedoes
   Stability (Unstable if below 1.00): 1.23
   Metacentric height 3.4 ft / 1.0 m
   Roll period: 13.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 57 %
         - Recoil effect (Restricted arc if above 1.00): 0.42
   Seaboat quality  (Average = 1.00): 1.14

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.560 / 0.570
   Length to Beam Ratio: 9.71 : 1
   'Natural speed' for length: 24.10 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  24.28 ft / 7.40 m,  23.62 ft / 7.20 m
      - Forward deck:   30.00 %,  23.62 ft / 7.20 m,  23.62 ft / 7.20 m
      - Aft deck:   35.00 %,  15.09 ft / 4.60 m,  15.09 ft / 4.60 m
      - Quarter deck:   15.00 %,  15.09 ft / 4.60 m,  15.09 ft / 4.60 m
      - Average freeboard:      19.41 ft / 5.92 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 126.4 %
      - Above water (accommodation/working, high = better): 170.5 %
   Waterplane Area: 24,468 Square feet or 2,273 Square metres
   Displacement factor (Displacement / loading): 114 %
   Structure weight / hull surface area: 100 lbs/sq ft or 488 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.20
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room


18t - 2x3 x 21in Torpedoes on sides
25t - Long Range Radio
52t - Fire Control (1910)
70t - Builder's Reserve

[Jefgte]

TDS on a 9000t cruiser is luxury.

Survivability (Non-critical penetrating hits needed to sink ship):
     13,588 lbs / 6,163 Kg = 76.4 x 7.1 " / 180 mm shells or 2.0 torpedoes

Test the SS without TDS & have a look on the torpedoes survivability.

Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

... Is a better choice for a cruiser.

[Jefgte]

... Armour: 2,166 tons, 20.5 %
      - Belts: 836 tons, 7.9 %
      - Torpedo bulkhead: 336 tons, 3.2 %
      - Armament: 154 tons, 1.5 %
      - Armour Deck: 784 tons, 7.4 %
      - Conning Towers: 57 tons, 0.5 %...

With 336t, you could build 8 x 40t MTBA

[Jefgte]

Testing your CL-2 with nearly the same characs
...without TDS => 1.9 Torpedo hits (it was 2)
=> 336t are free  ;)

CL-2, Aztec CL-2-1915 laid down 1915

Displacement:
   8 660 t light; 9 016 t standard; 10 312 t normal; 11 349 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (588,91 ft / 582,35 ft) x 64,73 ft x (19,15 / 20,54 ft)
   (179,50 m / 177,50 m) x 19,73 m  x (5,84 / 6,26 m)

Armament:
      8 - 7,09" / 180 mm 50,0 cal guns - 188,39lbs / 85,45kg shells, 140 per gun
     Breech loading guns in turret on barbette mounts, 1915 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      8 - 3,94" / 100 mm 50,0 cal guns - 32,30lbs / 14,65kg shells, 200 per gun
     Breech loading guns in deck mounts, 1915 Model
     8 x Single mounts on sides, evenly spread
      2 - 2,76" / 70,0 mm 50,0 cal guns - 11,09lbs / 5,03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1915 Model
     8 x Single mounts on sides, evenly spread
      8 - 0,31" / 8,0 mm 70,0 cal guns - 0,02lbs / 0,01kg shells, 1 500 per gun
     Machine guns in deck mounts, 1915 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 1 788 lbs / 811 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3,94" / 100 mm   433,07 ft / 132,00 m   9,84 ft / 3,00 m
   Ends:   1,97" / 50 mm   147,64 ft / 45,00 m   9,84 ft / 3,00 m
     1,64 ft / 0,50 m Unarmoured ends
     Main Belt covers 114 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   4,72" / 120 mm   1,97" / 50 mm      4,72" / 120 mm
   2nd:   2,56" / 65 mm         -               -
   3rd:   0,39" / 10 mm         -               -
   4th:   0,39" / 10 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 1,97" / 50 mm
   Forecastle: 1,18" / 30 mm  Quarter deck: 1,18" / 30 mm

   - Conning towers: Forward 2,76" / 70 mm, Aft 2,76" / 70 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 58 864 shp / 43 912 Kw = 30,00 kts
   Range 8 000nm at 14,00 kts
   Bunker at max displacement = 2 333 tons

Complement:
   511 - 665

Cost:
   £1,146 million / $4,585 million

Distribution of weights at normal displacement:
   Armament: 428 tons, 4,2 %
      - Guns: 428 tons, 4,2 %
   Armour: 2 126 tons, 20,6 %
      - Belts: 788 tons, 7,6 %
      - Armament: 396 tons, 3,8 %
      - Armour Deck: 885 tons, 8,6 %
      - Conning Towers: 56 tons, 0,5 %
   Machinery: 2 230 tons, 21,6 %
   Hull, fittings & equipment: 3 711 tons, 36,0 %
   Fuel, ammunition & stores: 1 652 tons, 16,0 %
   Miscellaneous weights: 165 tons, 1,6 %
      - On freeboard deck: 88 tons
      - Above deck: 77 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
    13 878 lbs / 6 295 Kg = 78,0 x 7,1 " / 180 mm shells or 1,9 torpedoes
   Stability (Unstable if below 1.00): 1,09
   Metacentric height 3,1 ft / 0,9 m
   Roll period: 15,5 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0,39
   Seaboat quality  (Average = 1.00): 1,04

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and large transom stern
   Block coefficient (normal/deep): 0,500 / 0,513
   Length to Beam Ratio: 9,00 : 1
   'Natural speed' for length: 27,77 kts
   Power going to wave formation at top speed: 54 %
   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:   17,50 %,  24,50 ft / 7,47 m,  22,60 ft / 6,89 m
      - Forward deck:   35,00 %,  22,60 ft / 6,89 m,  20,00 ft / 6,10 m
      - Aft deck:   30,00 %,  12,00 ft / 3,66 m,  12,00 ft / 3,66 m
      - Quarter deck:   17,50 %,  12,00 ft / 3,66 m,  12,00 ft / 3,66 m
      - Average freeboard:      17,24 ft / 5,26 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 86,3 %
      - Above water (accommodation/working, high = better): 164,3 %
   Waterplane Area: 26 119 Square feet or 2 426 Square metres
   Displacement factor (Displacement / loading): 123 %
   Structure weight / hull surface area: 105 lbs/sq ft or 512 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,99
      - Longitudinal: 1,09
      - Overall: 1,00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[TacCovert4]

After much review of designs for the new cruiser, the concept was refined into a "Frigate" cruiser for general purpose operations using the most modern equipment and weaponry in the Aztec inventory.  Armor protection was upgraded, as well as range, and reserve tonnage for a planned refit with 130mm secondary guns is included.

Sultan Ali, Aztec Battlecruiser laid down 1917

Displacement:
   26,301 t light; 27,410 t standard; 29,796 t normal; 31,705 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (753.78 ft / 748.03 ft) x 88.58 ft x (29.53 / 31.00 ft)
   (229.75 m / 228.00 m) x 27.00 m  x (9.00 / 9.45 m)

Armament:
      8 - 11.02" / 280 mm 50.0 cal guns - 709.07lbs / 321.63kg shells, 120 per gun
     Breech loading guns in turret on barbette mounts, 1917 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      16 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1917 Model
     8 x Twin mounts on sides, evenly spread
      4 - 2.76" / 70.0 mm 50.0 cal guns - 11.08lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1917 Model
     4 x Single mounts on centreline, evenly spread
      2 raised mounts
      24 - 0.47" / 12.0 mm 60.0 cal guns - 0.06lbs / 0.03kg shells, 1,500 per gun
     Machine guns in deck mounts, 1917 Model
     12 x Twin mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 6,854 lbs / 3,109 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   9.84" / 250 mm   492.13 ft / 150.00 m   16.40 ft / 5.00 m
   Ends:   1.97" / 50 mm   246.06 ft / 75.00 m   16.40 ft / 5.00 m
     9.84 ft / 3.00 m Unarmoured ends
     Main Belt covers 101 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.57" / 40 mm   492.13 ft / 150.00 m   32.81 ft / 10.00 m
   Beam between torpedo bulkheads 72.18 ft / 22.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   10.2" / 260 mm   6.30" / 160 mm      10.2" / 260 mm
   2nd:   4.72" / 120 mm   3.15" / 80 mm      4.72" / 120 mm

   - Protected deck - multiple decks:
   For and Aft decks: 3.94" / 100 mm
   Forecastle: 0.00" / 0 mm  Quarter deck: 2.95" / 75 mm

   - Conning towers: Forward 4.72" / 120 mm, Aft 4.72" / 120 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 121,183 shp / 90,402 Kw = 30.00 kts
   Range 9,000nm at 14.00 kts
   Bunker at max displacement = 4,295 tons

Complement:
   1,133 - 1,474

Cost:
   £4.099 million / $16.395 million

Distribution of weights at normal displacement:
   Armament: 1,429 tons, 4.8 %
      - Guns: 1,429 tons, 4.8 %
   Armour: 9,490 tons, 31.8 %
      - Belts: 3,612 tons, 12.1 %
      - Torpedo bulkhead: 941 tons, 3.2 %
      - Armament: 1,683 tons, 5.6 %
      - Armour Deck: 3,059 tons, 10.3 %
      - Conning Towers: 196 tons, 0.7 %
   Machinery: 4,442 tons, 14.9 %
   Hull, fittings & equipment: 9,506 tons, 31.9 %
   Fuel, ammunition & stores: 3,495 tons, 11.7 %
   Miscellaneous weights: 1,434 tons, 4.8 %
      - Hull below water: 1,111 tons
      - On freeboard deck: 80 tons
      - Above deck: 243 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     39,546 lbs / 17,938 Kg = 59.0 x 11.0 " / 280 mm shells or 5.9 torpedoes
   Stability (Unstable if below 1.00): 1.18
   Metacentric height 5.6 ft / 1.7 m
   Roll period: 15.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 55 %
         - Recoil effect (Restricted arc if above 1.00): 0.39
   Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.533 / 0.540
   Length to Beam Ratio: 8.44 : 1
   'Natural speed' for length: 27.35 kts
   Power going to wave formation at top speed: 51 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 12.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   15.43 %,  27.07 ft / 8.25 m,  23.62 ft / 7.20 m
      - Forward deck:   30.00 %,  23.62 ft / 7.20 m,  18.04 ft / 5.50 m
      - Aft deck:   39.14 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Quarter deck:   15.43 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Average freeboard:      19.95 ft / 6.08 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 91.9 %
      - Above water (accommodation/working, high = better): 147.3 %
   Waterplane Area: 45,515 Square feet or 4,228 Square metres
   Displacement factor (Displacement / loading): 112 %
   Structure weight / hull surface area: 152 lbs/sq ft or 744 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.02
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room

Decks:  Main - 75mm w 25mm splinter, Quarter - 60mm main w 15mm splinter

1111t below water - Electric Drives

50t - Flag Bridge
143t - 1905 Fire Direction
25t - Nightfighting equipment
25t - LR Radio

80t - Builder's Reserve

[TacCovert4]

Atlatl, Aztec Frigate laid down 1915

Displacement:
   8,989 t light; 9,357 t standard; 10,890 t normal; 12,116 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (590.03 ft / 585.63 ft) x 61.84 ft x (19.49 / 21.20 ft)
   (179.84 m / 178.50 m) x 18.85 m  x (5.94 / 6.46 m)

Armament:
      8 - 7.09" / 180 mm 50.0 cal guns - 188.39lbs / 85.45kg shells, 140 per gun
     Breech loading guns in deck and hoist mounts, 1915 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      8 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 200 per gun
     Quick firing guns in deck mounts, 1915 Model
     8 x Single mounts on sides, evenly spread
      2 - 2.76" / 70.0 mm 50.0 cal guns - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1915 Model
     2 x Single mounts on centreline, evenly spread
      2 raised mounts
      8 - 0.31" / 8.0 mm 70.0 cal guns - 0.02lbs / 0.01kg shells, 1,500 per gun
     Machine guns in deck mounts, 1915 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 1,788 lbs / 811 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.33" / 110 mm   393.70 ft / 120.00 m   9.84 ft / 3.00 m
   Ends:   2.36" / 60 mm   187.01 ft / 57.00 m   9.84 ft / 3.00 m
     4.92 ft / 1.50 m Unarmoured ends
     Main Belt covers 103 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   4.72" / 120 mm   2.36" / 60 mm      4.72" / 120 mm
   2nd:   1.97" / 50 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 1.97" / 50 mm
   Forecastle: 0.79" / 20 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,
   Direct drive, 4 shafts, 70,791 shp / 52,810 Kw = 30.00 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 2,759 tons

Complement:
   532 - 692

Cost:
   £1.255 million / $5.020 million

Distribution of weights at normal displacement:
   Armament: 496 tons, 4.6 %
      - Guns: 496 tons, 4.6 %
   Armour: 1,927 tons, 17.7 %
      - Belts: 849 tons, 7.8 %
      - Armament: 176 tons, 1.6 %
      - Armour Deck: 835 tons, 7.7 %
      - Conning Towers: 67 tons, 0.6 %
   Machinery: 2,681 tons, 24.6 %
   Hull, fittings & equipment: 3,643 tons, 33.5 %
   Fuel, ammunition & stores: 1,900 tons, 17.5 %
   Miscellaneous weights: 242 tons, 2.2 %
      - Hull above water: 20 tons
      - On freeboard deck: 120 tons
      - Above deck: 102 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     14,125 lbs / 6,407 Kg = 79.4 x 7.1 " / 180 mm shells or 1.7 torpedoes
   Stability (Unstable if below 1.00): 1.23
   Metacentric height 3.6 ft / 1.1 m
   Roll period: 13.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 58 %
         - Recoil effect (Restricted arc if above 1.00): 0.37
   Seaboat quality  (Average = 1.00): 1.15

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.540 / 0.552
   Length to Beam Ratio: 9.47 : 1
   'Natural speed' for length: 24.20 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 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 %,  24.93 ft / 7.60 m,  23.29 ft / 7.10 m
      - Forward deck:   30.00 %,  23.29 ft / 7.10 m,  17.39 ft / 5.30 m
      - Aft deck:   35.00 %,  17.39 ft / 5.30 m,  17.39 ft / 5.30 m
      - Quarter deck:   15.00 %,  17.39 ft / 5.30 m,  17.39 ft / 5.30 m
      - Average freeboard:      19.59 ft / 5.97 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 95.2 %
      - Above water (accommodation/working, high = better): 168.1 %
   Waterplane Area: 25,040 Square feet or 2,326 Square metres
   Displacement factor (Displacement / loading): 119 %
   Structure weight / hull surface area: 101 lbs/sq ft or 495 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.22
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room


18t - 2x3 x 21in Torpedoes on sides
25t - Long Range Radio
52t - Fire Control (1910)
20t - Builder's Reserve
25t - Night Listening Devices (1904)
100t - Electric T&E for main battery
20t - Additional Damage Control Equipment

[TacCovert4]

With the burgeoning war causing some major shifts within Aztec construction plans, the new MTB-B type has a lot of appeal.  Of course, range of the MTB-B is so short that it cannot be adequately used in fleet support.  Therefore a combat-rated tender will be needed if squadrons of these are to be deployed into action.  Utilizing a 'herringbone' arrangement of the boats to maximize fitment in a small space, two lightweight and relatively inexpensive cruiser designs have been put forth with the purpose of rapid production and maximum utilization of available resources while still providing self-defense self-escorting capabilities:

Loggerhead, Aztec MTB Tender laid down 1915

Displacement:
   2,511 t light; 2,601 t standard; 2,870 t normal; 3,085 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (390.61 ft / 387.14 ft) x 39.37 ft x (11.81 / 12.51 ft)
   (119.06 m / 118.00 m) x 12.00 m  x (3.60 / 3.81 m)

Armament:
      8 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 200 per gun
     Quick firing guns in deck mounts, 1915 Model
     3 x Twin mounts on centreline, forward evenly spread
      2 raised mounts
     1 x Twin mount on centreline, forward deck centre
      1 double raised mount
      2 - 2.76" / 70.0 mm 50.0 cal guns - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1915 Model
     2 x Single mounts on centreline, aft evenly spread
      2 raised mounts
      16 - 0.31" / 8.0 mm 70.0 cal guns - 0.02lbs / 0.01kg shells, 2,000 per gun
     Machine guns in deck mounts, 1915 Model
     8 x Twin mounts on sides, evenly spread
      Weight of broadside 281 lbs / 127 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.38" / 35 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 1.57" / 40 mm
   Forecastle: 0.79" / 20 mm  Quarter deck: 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, 24,219 shp / 18,067 Kw = 27.00 kts
   Range 5,400nm at 12.00 kts
   Bunker at max displacement = 485 tons

Complement:
   195 - 254

Cost:
   £0.337 million / $1.349 million

Distribution of weights at normal displacement:
   Armament: 50 tons, 1.8 %
      - Guns: 50 tons, 1.8 %
   Armour: 306 tons, 10.7 %
      - Armament: 13 tons, 0.4 %
      - Armour Deck: 289 tons, 10.1 %
      - Conning Tower: 4 tons, 0.1 %
   Machinery: 917 tons, 32.0 %
   Hull, fittings & equipment: 861 tons, 30.0 %
   Fuel, ammunition & stores: 359 tons, 12.5 %
   Miscellaneous weights: 375 tons, 13.1 %
      - Hull below water: 32 tons
      - Hull above water: 40 tons
      - On freeboard deck: 245 tons
      - Above deck: 58 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,717 lbs / 1,232 Kg = 89.0 x 3.9 " / 100 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.22
   Metacentric height 1.8 ft / 0.5 m
   Roll period: 12.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 53 %
         - Recoil effect (Restricted arc if above 1.00): 0.15
   Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.558 / 0.566
   Length to Beam Ratio: 9.83 : 1
   'Natural speed' for length: 19.68 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 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,  16.40 ft / 5.00 m
      - Aft deck:   35.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Quarter deck:   15.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      13.83 ft / 4.22 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 112.4 %
      - Above water (accommodation/working, high = better): 138.7 %
   Waterplane Area: 10,717 Square feet or 996 Square metres
   Displacement factor (Displacement / loading): 108 %
   Structure weight / hull surface area: 52 lbs/sq ft or 255 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.87
      - Longitudinal: 1.21
      - Overall: 0.90
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room

240t - 6 x MTB-Bs and Davits
8t - 1912 FC
25t - LR Radio
25t- Night Fighting Devices
22t - MTB-B Maintenance Tonnage
10t - Additional Damage Control and Firefighting Equipment
5t - Additional Handling Equipment, work lights, night work lights, etc. for MTBs.
40t - Additional Accommodation Spaces

[TacCovert4]

And the second design. Fewer guns but punchier ones with longer combat 'endurance' due to hoists if an overall far slower rate of fire and more difficulty in obtaining long range FC solutions due to insufficient gun numbers.

Loggerhead, Aztec MTB Tender laid down 1915

Displacement:
   2,615 t light; 2,710 t standard; 2,964 t normal; 3,168 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (390.61 ft / 387.14 ft) x 39.37 ft x (12.47 / 13.14 ft)
   (119.06 m / 118.00 m) x 12.00 m  x (3.80 / 4.00 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, 1915 Model
     2 x Twin mounts on centreline, forward evenly spread
      1 raised mount
      2 - 2.76" / 70.0 mm 50.0 cal guns - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1915 Model
     2 x Single mounts on centreline, aft evenly spread
      2 raised mounts
      16 - 0.31" / 8.0 mm 70.0 cal guns - 0.02lbs / 0.01kg shells, 2,000 per gun
     Machine guns in deck mounts, 1915 Model
     8 x Twin mounts on sides, evenly spread
      Weight of broadside 306 lbs / 139 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.57" / 40 mm         -         1.57" / 40 mm

   - Protected deck - single deck:
   For and Aft decks: 1.57" / 40 mm
   Forecastle: 0.79" / 20 mm  Quarter deck: 1.06" / 27 mm

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

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 24,524 shp / 18,295 Kw = 27.00 kts
   Range 5,000nm at 12.00 kts
   Bunker at max displacement = 458 tons

Complement:
   200 - 261

Cost:
   £0.368 million / $1.473 million

Distribution of weights at normal displacement:
   Armament: 90 tons, 3.0 %
      - Guns: 90 tons, 3.0 %
   Armour: 304 tons, 10.3 %
      - Armament: 9 tons, 0.3 %
      - Armour Deck: 288 tons, 9.7 %
      - Conning Tower: 7 tons, 0.2 %
   Machinery: 929 tons, 31.3 %
   Hull, fittings & equipment: 916 tons, 30.9 %
   Fuel, ammunition & stores: 349 tons, 11.8 %
   Miscellaneous weights: 376 tons, 12.7 %
      - Hull below water: 32 tons
      - Hull above water: 40 tons
      - On freeboard deck: 245 tons
      - Above deck: 59 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,564 lbs / 1,163 Kg = 38.2 x 5.1 " / 130 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 1.6 ft / 0.5 m
   Roll period: 13.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 52 %
         - Recoil effect (Restricted arc if above 1.00): 0.28
   Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.546 / 0.554
   Length to Beam Ratio: 9.83 : 1
   'Natural speed' for length: 19.68 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 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,  16.40 ft / 5.00 m
      - Aft deck:   35.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Quarter deck:   15.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      13.83 ft / 4.22 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 114.6 %
      - Above water (accommodation/working, high = better): 133.7 %
   Waterplane Area: 10,597 Square feet or 985 Square metres
   Displacement factor (Displacement / loading): 104 %
   Structure weight / hull surface area: 56 lbs/sq ft or 276 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 1.31
      - Overall: 0.90
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room

240t - 6 x MTB-Bs and Davits
9t - 1912 FC
25t - LR Radio
25t- Night Fighting Devices
22t - MTB-B Maintenance Tonnage
10t - Additional Damage Control and Firefighting Equipment
5t - Additional Handling Equipment, work lights, night work lights, etc. for MTBs.
40t - Additional Accommodation Spaces

[snip]

Nasty customers. I cant help but feel they are a little slow at 27knts. There is also going to be a lot of exposed Things that go Boom with just a protected deck and the MTBs being launchable. IMO, if they are caught they are dead but its going to take some effort to finish the job.

[TacCovert4]

Nasty customers. I cant help but feel they are a little slow at 27knts. There is also going to be a lot of exposed Things that go Boom with just a protected deck and the MTBs being launchable. IMO, if they are caught they are dead but its going to take some effort to finish the job.

It's a trade off.  I did specify the tonnage for mtb maintenance as below the water,  so hopefully the most explosive things are under the deck. 

As for the speed, it's a trade off due to the need for a relatively low aft fretboard for the mtbs.  And because I dont want to put a lot of funds into an mtb carrier.

[The Rock Doctor]

The second design will have less issue with deck space on account of the fewer, heavier guns.  On the other hand, I'd want a mount aft when fleeing.

In a fleet action, what is the advantage of 12 x MTB-b over the 6 x ~900 t destroyers you could build on similar tonnage to the tenders?

[TacCovert4]

Actually a good question.  And I have some thoughts as to how they could be employed.  In an archipelago setting and prior to reliable aircraft carriers, they've got a lot of use as pickets, ambushers, etc.  Also they can skate over minefields, which can be useful.  And since the cruiser is a useful escort, the cruiser can assist the fleet screen if necessary or screen auxiliaries.  Plus these ships make good 'station ships' in colonies and such, while a DD flotilla doesn't really command the same 'presence' as even a small cruiser. 

The 100mm gunned version has some firepower in the rear arc, just not at the 6 o'clock exactly.  And when DP guns come about, the 70mm AA guns could likely be removed in favor of an all 100mm DP armament, which would make the cruisers decent AA escorts for auxiliaries or other vessels.

[Desertfox]

In the spirit of saving lives and with the likely need to sweep mines post-war, Japan offers the following ship design to the Aztec free of charge.

The guns are just two rifles for use to explode mines and for shooting sharks. Balloon is for looking for mines and survivors.

No 1, Japan/Aztec Rescue Ship laid down 1914

Displacement:
   202 t light; 206 t standard; 225 t normal; 240 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (151.59 ft / 150.00 ft) x 21.00 ft x (5.00 / 5.25 ft)
   (46.20 m / 45.72 m) x 6.40 m  x (1.52 / 1.60 m)

Armament:
      2 - 0.26" / 6.5 mm 45.0 cal guns - 0.01lbs / 0.00kg shells, 30 per gun
     Breech loading guns in deck mounts, 1914 Model
     2 x Single mounts on sides amidships
      Weight of broadside 0 lbs / 0 kg

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 1,173 shp / 875 Kw = 17.00 kts
   Range 2,410nm at 10.00 kts
   Bunker at max displacement = 34 tons

Complement:
   28 - 37

Cost:
   £0.017 million / $0.068 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
      - Guns: 0 tons, 0.0 %
   Machinery: 45 tons, 20.1 %
   Hull, fittings & equipment: 82 tons, 36.3 %
   Fuel, ammunition & stores: 23 tons, 10.3 %
   Miscellaneous weights: 75 tons, 33.3 %
      - Hull below water: 21 tons
      - On freeboard deck: 54 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     437 lbs / 198 Kg = 52,176.3 x 0.3 " / 7 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 0.6 ft / 0.2 m
   Roll period: 11.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   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): 0.500 / 0.508
   Length to Beam Ratio: 7.14 : 1
   'Natural speed' for length: 12.25 kts
   Power going to wave formation at top speed: 60 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   24.00 %,  9.00 ft / 2.74 m,  7.00 ft / 2.13 m
      - Forward deck:   30.00 %,  7.00 ft / 2.13 m,  7.00 ft / 2.13 m
      - Aft deck:   26.00 %,  7.00 ft / 2.13 m,  7.00 ft / 2.13 m
      - Quarter deck:   20.00 %,  7.00 ft / 2.13 m,  7.00 ft / 2.13 m
      - Average freeboard:      7.19 ft / 2.19 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 76.2 %
      - Above water (accommodation/working, high = better): 99.9 %
   Waterplane Area: 2,099 Square feet or 195 Square metres
   Displacement factor (Displacement / loading): 136 %
   Structure weight / hull surface area: 26 lbs/sq ft or 125 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.10
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

25t - LR Wireless
20t - Observation Balloon
9t - Rescue Equipment/Signaling Rockets
10t - Minesweeping Gear
11t - Electric Drive