Aztec Ships 1915-1917

[TacCovert4]

After much hand-wringing, the Naval Ministry has concluded that the need for smaller vessels in quantity outweighs the need for 'Frigate' cruisers in the short term.  Two revised proposals for a Frigate for the 1917 budget cycle are put forward.  Principle in difference is the speed/range and secondary armament, most other things being generally equal.  A hard 'cap' of 9000 tons light displacement was put in place due to budgetary restrictions, obviously by scaling the design up to 10,000t it could be 'improved', but this is seen as an endless cycle and larger cruisers are seen as something that could be built with 28cm guns as 'light battlecruisers'.

First Proposal, with a 100mm secondary battery.

Atlatl, Aztec Frigate laid down 1917

Displacement:
   8,996 t light; 9,355 t standard; 10,466 t normal; 11,355 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (584.61 ft / 580.71 ft) x 62.47 ft x (18.70 / 19.94 ft)
   (178.19 m / 177.00 m) x 19.04 m  x (5.70 / 6.08 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, 1917 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
     Quick firing guns in deck mounts, 1917 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, 1917 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, 2,500 per gun
     Machine guns in deck mounts, 1917 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   426.51 ft / 130.00 m   16.40 ft / 5.00 m
   Ends:   1.57" / 40 mm   154.20 ft / 47.00 m   9.84 ft / 3.00 m
     Main Belt covers 113 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.94" / 100 mm   1.97" / 50 mm      3.94" / 100 mm
   2nd:   1.57" / 40 mm   0.79" / 20 mm            -

   - Armoured deck - single deck:
   For and Aft decks: 1.18" / 30 mm
   Forecastle: 0.79" / 20 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 1.97" / 50 mm, Aft 1.97" / 50 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 79,452 shp / 59,272 Kw = 31.00 kts
   Range 7,900nm at 14.00 kts
   Bunker at max displacement = 2,000 tons

Complement:
   516 - 672

Cost:
   £1.628 million / $6.512 million

Distribution of weights at normal displacement:
   Armament: 410 tons, 3.9 %
      - Guns: 410 tons, 3.9 %
   Armour: 1,906 tons, 18.2 %
      - Belts: 1,207 tons, 11.5 %
      - Armament: 132 tons, 1.3 %
      - Armour Deck: 527 tons, 5.0 %
      - Conning Towers: 41 tons, 0.4 %
   Machinery: 2,912 tons, 27.8 %
   Hull, fittings & equipment: 3,607 tons, 34.5 %
   Fuel, ammunition & stores: 1,470 tons, 14.0 %
   Miscellaneous weights: 161 tons, 1.5 %
      - Hull above water: 61 tons
      - On freeboard deck: 30 tons
      - Above deck: 70 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     10,948 lbs / 4,966 Kg = 61.5 x 7.1 " / 180 mm shells or 1.5 torpedoes
   Stability (Unstable if below 1.00): 1.15
   Metacentric height 3.2 ft / 1.0 m
   Roll period: 14.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.40
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.540 / 0.549
   Length to Beam Ratio: 9.30 : 1
   'Natural speed' for length: 24.10 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 68
   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 %,  22.15 ft / 6.75 m,  21.33 ft / 6.50 m
      - Forward deck:   30.00 %,  21.33 ft / 6.50 m,  16.73 ft / 5.10 m
      - Aft deck:   35.00 %,  16.73 ft / 5.10 m,  16.73 ft / 5.10 m
      - Quarter deck:   15.00 %,  16.73 ft / 5.10 m,  16.73 ft / 5.10 m
      - Average freeboard:      18.41 ft / 5.61 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 106.5 %
      - Above water (accommodation/working, high = better): 164.7 %
   Waterplane Area: 25,080 Square feet or 2,330 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 101 lbs/sq ft or 493 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.14
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform



25t - Long Range Radio
41t - Fire Control (1908)
25t - Night Listening Devices (1904)
60t - Electric T&E for main battery
10t - Additional Damage Control Equipment

[TacCovert4]

Second proposal, with a 130mm secondary battery that is 2 guns lighter, so 3 guns per side instead of 4.  Ship is .5kt slower as well.

Atlatl, Aztec Frigate laid down 1917

Displacement:
   8,998 t light; 9,376 t standard; 10,505 t normal; 11,407 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (595.15 ft / 591.54 ft) x 62.01 ft x (18.70 / 19.95 ft)
   (181.40 m / 180.30 m) x 18.90 m  x (5.70 / 6.08 m)

Armament:
      8 - 7.09" / 180 mm 50.0 cal guns - 188.38lbs / 85.45kg shells, 140 per gun
     Breech loading guns in deck and hoist mounts, 1917 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      6 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck mounts, 1917 Model
     6 x Single mounts on sides, evenly spread
      2 - 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
     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, 2,500 per gun
     Machine guns in deck mounts, 1917 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 1,955 lbs / 887 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.94" / 100 mm   426.51 ft / 130.00 m   16.40 ft / 5.00 m
   Ends:   1.77" / 45 mm   164.04 ft / 50.00 m   16.40 ft / 5.00 m
     0.98 ft / 0.30 m Unarmoured ends
     Main Belt covers 111 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.94" / 100 mm   1.97" / 50 mm      3.94" / 100 mm
   2nd:   1.57" / 40 mm   0.79" / 20 mm            -

   - Armoured deck - single deck:
   For and Aft decks: 1.38" / 35 mm
   Forecastle: 0.79" / 20 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 1.97" / 50 mm, Aft 1.97" / 50 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 73,580 shp / 54,891 Kw = 30.50 kts
   Range 8,000nm at 14.00 kts
   Bunker at max displacement = 2,031 tons

Complement:
   518 - 674

Cost:
   £1.589 million / $6.356 million

Distribution of weights at normal displacement:
   Armament: 440 tons, 4.2 %
      - Guns: 440 tons, 4.2 %
   Armour: 2,077 tons, 19.8 %
      - Belts: 1,295 tons, 12.3 %
      - Armament: 125 tons, 1.2 %
      - Armour Deck: 616 tons, 5.9 %
      - Conning Towers: 41 tons, 0.4 %
   Machinery: 2,697 tons, 25.7 %
   Hull, fittings & equipment: 3,601 tons, 34.3 %
   Fuel, ammunition & stores: 1,507 tons, 14.3 %
   Miscellaneous weights: 183 tons, 1.7 %
      - Hull above water: 65 tons
      - On freeboard deck: 58 tons
      - Above deck: 60 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     12,088 lbs / 5,483 Kg = 67.9 x 7.1 " / 180 mm shells or 1.6 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 3.1 ft / 1.0 m
   Roll period: 14.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.43
   Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.536 / 0.546
   Length to Beam Ratio: 9.54 : 1
   'Natural speed' for length: 24.32 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 68
   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 %,  20.51 ft / 6.25 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:   35.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Quarter deck:   15.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Average freeboard:      17.62 ft / 5.37 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 100.4 %
      - Above water (accommodation/working, high = better): 159.4 %
   Waterplane Area: 25,265 Square feet or 2,347 Square metres
   Displacement factor (Displacement / loading): 112 %
   Structure weight / hull surface area: 101 lbs/sq ft or 495 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.04
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform


18t - 2x3 x 21in Torpedoes on sides
25t - Long Range Radio
45t - Fire Control (1910)
25t - Night Listening Devices (1904)
60t - Electric T&E for main battery
10t - Additional Damage Control Equipment

[TacCovert4]

Proposal 3.  Like Proposal 2, but using the twin deck and hoist mounts in development (proposal 2 is using the single deck mounts in development for later DDs)  Attains a 4 gun secondary broadside by placing the third twin mount in a superfiring Q position over and slightly ahead of the torpedo tubes (proposals 2 and 3 have torpedoes, proposal 1 really doesn't have space for them and the half-knot of speed has to cost something).

Atlatl, Aztec Frigate laid down 1917

Displacement:
   8,998 t light; 9,376 t standard; 10,505 t normal; 11,407 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (595.15 ft / 591.54 ft) x 62.01 ft x (18.70 / 19.95 ft)
   (181.40 m / 180.30 m) x 18.90 m  x (5.70 / 6.08 m)

Armament:
      8 - 7.09" / 180 mm 50.0 cal guns - 188.38lbs / 85.45kg shells, 140 per gun
     Breech loading guns in deck and hoist mounts, 1917 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      6 - 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
     2 x Twin mounts on sides, forward deck aft
     1 x Twin mount on centreline, aft deck forward
      1 raised mount
      2 - 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
     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, 2,500 per gun
     Machine guns in deck mounts, 1917 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 1,955 lbs / 887 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.94" / 100 mm   426.51 ft / 130.00 m   16.40 ft / 5.00 m
   Ends:   1.57" / 40 mm   164.04 ft / 50.00 m   14.11 ft / 4.30 m
     0.98 ft / 0.30 m Unarmoured ends
     Main Belt covers 111 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.94" / 100 mm   1.97" / 50 mm      3.94" / 100 mm
   2nd:   1.57" / 40 mm   0.79" / 20 mm      1.57" / 40 mm

   - Armoured deck - single deck:
   For and Aft decks: 1.18" / 30 mm
   Forecastle: 0.79" / 20 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 1.97" / 50 mm, Aft 1.97" / 50 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 73,580 shp / 54,891 Kw = 30.50 kts
   Range 8,000nm at 14.00 kts
   Bunker at max displacement = 2,031 tons

Complement:
   518 - 674

Cost:
   £1.630 million / $6.519 million

Distribution of weights at normal displacement:
   Armament: 461 tons, 4.4 %
      - Guns: 461 tons, 4.4 %
   Armour: 1,943 tons, 18.5 %
      - Belts: 1,254 tons, 11.9 %
      - Armament: 109 tons, 1.0 %
      - Armour Deck: 540 tons, 5.1 %
      - Conning Towers: 41 tons, 0.4 %
   Machinery: 2,697 tons, 25.7 %
   Hull, fittings & equipment: 3,714 tons, 35.4 %
   Fuel, ammunition & stores: 1,507 tons, 14.3 %
   Miscellaneous weights: 183 tons, 1.7 %
      - Hull above water: 65 tons
      - On freeboard deck: 58 tons
      - Above deck: 60 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     11,536 lbs / 5,233 Kg = 64.8 x 7.1 " / 180 mm shells or 1.5 torpedoes
   Stability (Unstable if below 1.00): 1.12
   Metacentric height 3.0 ft / 0.9 m
   Roll period: 15.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.50
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.536 / 0.546
   Length to Beam Ratio: 9.54 : 1
   'Natural speed' for length: 24.32 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 68
   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 %,  20.51 ft / 6.25 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:   35.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Quarter deck:   15.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Average freeboard:      17.62 ft / 5.37 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 102.2 %
      - Above water (accommodation/working, high = better): 159.4 %
   Waterplane Area: 25,265 Square feet or 2,347 Square metres
   Displacement factor (Displacement / loading): 111 %
   Structure weight / hull surface area: 104 lbs/sq ft or 508 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.06
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform


18t - 2x3 x 21in Torpedoes on sides
25t - Long Range Radio
45t - Fire Control (1910)
25t - Night Listening Devices (1904)
60t - Electric T&E for main battery
10t - Additional Damage Control Equipment

[TacCovert4]

Proposal 4.  The only one with Electric Drive.  Uses the same arrangement of a pair of side-mounted twin 130s and a superfiring twin 130 to give a secondary broadside of 4 guns.  Only this variant has the superfiring gun in the X position as the electric drive needs delete the X 180mm turret.  This design technically 'matches' information about a Roman cruiser being put forward in this general class with 6 x 'guns greater than 140mm but not a battlecruiser'.  Also given up are the electric motors and gearing (15t per mount) for powered traverse and elevation on the main battery.  Something not seen as a problem at ranges exceeding 10km, but could be somewhat problematic at closer ranges where there may be multiple threats or fast-maneuvering threats that could otherwise be serviced with a 180mm gun in a powered mount.  Effective gains for the loss of 1 turret and .5m of armor belt are the damage control benefits of turboelectric propulsion, the rapid acceleration and deceleration capabilities, and 900nm of range due to fuel efficiency.

{Oops, didn't copy/paste report.  Well, overall this was my least favorite anyway.....so there's that}

[TacCovert4]

The Sultanate has also issued a requirement for a DD-Leader to be laid down in 1918 once the current light cruiser program has been concluded.  This is due to lessons learned during the Caicos War, specifically the battles of Grand Turk and Ironclad Bay, where the generally lighter Destroyers of the Sultanate and MTBs were relatively efficient against capital ships when operating in squadrons or wings, but not capable of standing up to the heavier destroyers of the Republic on a one for one basis.  At Grand Turk, the presence of two 'scout cruisers' was instrumental in functioning as 'covering fire' for the DDs and MTBs, but the SC-1 class is considered to be wholly unsuited to this role in the post-war assessment due to their relatively weak armament when compared with even modern Roman DDs and their relatively light protective deck armor scheme making them unable to survive hits either, which was well proven.

The requirements are as follows:

Speed sufficient to keep up with destroyer formations
Armament of no fewer than 8 of the new 130/50 guns in development
Protection sufficient to shield armament and vital spaces from destroyer-grade firepower

Acapulco Heavy Industries has put out the following proposal:

SC-6, Aztec Scout Cruiser laid down 1918

Displacement:
   5,998 t light; 6,211 t standard; 6,864 t normal; 7,387 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (513.80 ft / 508.53 ft) x 47.90 ft x (19.03 / 20.14 ft)
   (156.61 m / 155.00 m) x 14.60 m  x (5.80 / 6.14 m)

Armament:
      10 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 180 per gun
     Quick firing guns in deck and hoist mounts, 1918 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     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, 1918 Model
     2 x Single mounts on sides, aft deck forward
      2 raised mounts
      16 - 0.31" / 8.0 mm 70.0 cal guns - 0.02lbs / 0.01kg shells, 2,500 per gun
     Machine guns in deck mounts, 1918 Model
     8 x Twin mounts on sides, evenly spread
      Weight of broadside 732 lbs / 332 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm   1.18" / 30 mm      1.97" / 50 mm

   - Box over machinery & magazines:
   1.57" / 40 mm

   - Conning towers: Forward 1.97" / 50 mm, Aft 1.97" / 50 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 76,157 shp / 56,813 Kw = 32.50 kts
   Range 6,200nm at 14.00 kts
   Bunker at max displacement = 1,176 tons

Complement:
   376 - 490

Cost:
   £1.342 million / $5.369 million

Distribution of weights at normal displacement:
   Armament: 184 tons, 2.7 %
      - Guns: 184 tons, 2.7 %
   Armour: 847 tons, 12.3 %
      - Armament: 49 tons, 0.7 %
      - Armour Deck: 767 tons, 11.2 %
      - Conning Towers: 31 tons, 0.4 %
   Machinery: 2,747 tons, 40.0 %
   Hull, fittings & equipment: 2,122 tons, 30.9 %
   Fuel, ammunition & stores: 866 tons, 12.6 %
   Miscellaneous weights: 98 tons, 1.4 %
      - Hull above water: 20 tons
      - On freeboard deck: 18 tons
      - Above deck: 60 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,611 lbs / 1,638 Kg = 53.9 x 5.1 " / 130 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 1.9 ft / 0.6 m
   Roll period: 14.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 67 %
         - Recoil effect (Restricted arc if above 1.00): 0.50
   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): 0.518 / 0.527
   Length to Beam Ratio: 10.62 : 1
   'Natural speed' for length: 22.55 kts
   Power going to wave formation at top speed: 61 %
   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:   20.00 %,  19.69 ft / 6.00 m,  18.70 ft / 5.70 m
      - Forward deck:   30.00 %,  18.70 ft / 5.70 m,  17.72 ft / 5.40 m
      - Aft deck:   35.00 %,  17.72 ft / 5.40 m,  16.40 ft / 5.00 m
      - Quarter deck:   15.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Average freeboard:      17.71 ft / 5.40 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 140.4 %
      - Above water (accommodation/working, high = better): 147.1 %
   Waterplane Area: 16,505 Square feet or 1,533 Square metres
   Displacement factor (Displacement / loading): 96 %
   Structure weight / hull surface area: 76 lbs/sq ft or 370 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 1.46
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room

25t - LR Radio
25t - Night Listening Devices (1908)
20t - 1908 FC (includes allowance for upgrades)
10t - Additional Damage Control Equipment
18t - 2x3x21in TT on sides

[The Rock Doctor]

The double-raised mount should be a twin, yes?

[TacCovert4]

The double-raised mount should be a twin, yes?

Yes.  Typo, that was working on a lot of designs at once. 

[The Rock Doctor]

No worries.  I've got a spreadsheet to track my 1916 armored cruiser candidates.

[TacCovert4]

No worries.  I've got a spreadsheet to track my 1916 armored cruiser candidates.

Yeah, I finally decided on my 1916 cruiser.  But the 1917 'Frigate' and 1918 'Corvette' programs are currently in limbo.  I have an alternate for the Corvette (scout cruiser) with the same armament but a more traditional armored deck and belt arrangement at a loss of a half-knot of speed.

Take a look at the 'Frigate' proposals farther up, that's for a 'cruising cruiser' rather than a 'scouting and screening vessel/DD leader'.  Having precisely 5 cruisers in service and all of them relatively small is painful and has to be rectified.  Doubly so when you consider than 2 of them are both slow and severely underarmed for anything other than fighting destroyers or MTBs, and the other three are 'fast enough' and make pretty good commerce raiders (surprisingly effective actually as they weren't designed for it) but they have less firepower than most DESTROYERS half their size.

[TacCovert4]

In a complete departure from its original plans for heavily armed and armored battleships to supplement the Implacable class, the Navy Ministry has been ordered to design a 'light battlecruiser unit'.  Budgetary concerns, along with the Sultan's direct concerns about attempting to go 'toe to toe' with the Roman Republic's Navy in battleship building have weighed heavily in this decision to explore other options and directions for the fleet.  The Sultan has 'grave concerns' about attempting to catch up to the Roman fleet's current crop of battleships only to be outclassed by those built in response and placed in an Ironclad Bay situation again where Aztec fleet units are too slow, too small, and too few to withstand the larger fleets that Rome can push out of its larger industrial strength.

BC1916, Aztec Battlecruiser laid down 1916

Displacement:
   21,093 t light; 21,937 t standard; 24,095 t normal; 25,821 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (733.37 ft / 725.07 ft) x 75.46 ft x (26.57 / 28.11 ft)
   (223.53 m / 221.00 m) x 23.00 m  x (8.10 / 8.57 m)

Armament:
      6 - 11.02" / 280 mm 50.0 cal guns - 709.07lbs / 321.63kg shells, 110 per gun
     Breech loading guns in turret on barbette mounts, 1916 Model
     3 x Twin mounts on centreline ends, majority forward
      1 raised mount - superfiring
      12 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1916 Model
     6 x Twin mounts on sides, evenly spread
      4 - 2.76" / 70.0 mm 50.0 cal guns - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1916 Model
     4 x Single mounts on centreline, evenly spread
      4 raised mounts
      16 - 0.31" / 8.0 mm 60.0 cal guns - 0.02lbs / 0.01kg shells, 2,000 per gun
     Machine guns in deck mounts, 1916 Model
     8 x Twin mounts on sides, evenly spread
      Weight of broadside 5,151 lbs / 2,336 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   6.69" / 170 mm   557.74 ft / 170.00 m   16.40 ft / 5.00 m
   Ends:   1.97" / 50 mm   164.04 ft / 50.00 m   16.40 ft / 5.00 m
     3.28 ft / 1.00 m Unarmoured ends
     Main Belt covers 118 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.18" / 30 mm   492.13 ft / 150.00 m   26.25 ft / 8.00 m
   Beam between torpedo bulkheads 65.62 ft / 20.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   6.69" / 170 mm   2.76" / 70 mm      6.69" / 170 mm
   2nd:   1.97" / 50 mm   0.98" / 25 mm      1.97" / 50 mm

   - Armoured deck - single deck:
   For and Aft decks: 2.36" / 60 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 1.57" / 40 mm

   - Conning towers: Forward 3.94" / 100 mm, Aft 3.94" / 100 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 139,349 shp / 103,954 Kw = 32.00 kts
   Range 8,900nm at 14.00 kts
   Bunker at max displacement = 3,884 tons

Complement:
   966 - 1,257

Cost:
   £3.272 million / $13.087 million

Distribution of weights at normal displacement:
   Armament: 1,074 tons, 4.5 %
      - Guns: 1,074 tons, 4.5 %
   Armour: 5,700 tons, 23.7 %
      - Belts: 2,659 tons, 11.0 %
      - Torpedo bulkhead: 564 tons, 2.3 %
      - Armament: 723 tons, 3.0 %
      - Armour Deck: 1,611 tons, 6.7 %
      - Conning Towers: 142 tons, 0.6 %
   Machinery: 5,192 tons, 21.5 %
   Hull, fittings & equipment: 7,660 tons, 31.8 %
   Fuel, ammunition & stores: 3,002 tons, 12.5 %
   Miscellaneous weights: 1,467 tons, 6.1 %
      - Hull below water: 1,298 tons
      - Hull above water: 70 tons
      - Above deck: 99 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     26,647 lbs / 12,087 Kg = 39.8 x 11.0 " / 280 mm shells or 3.2 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 4.6 ft / 1.4 m
   Roll period: 14.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 53 %
         - Recoil effect (Restricted arc if above 1.00): 0.50
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.580 / 0.588
   Length to Beam Ratio: 9.61 : 1
   'Natural speed' for length: 26.93 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 52
   Bow angle (Positive = bow angles forward): 12.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   15.43 %,  23.62 ft / 7.20 m,  22.97 ft / 7.00 m
      - Forward deck:   30.00 %,  22.97 ft / 7.00 m,  19.69 ft / 6.00 m
      - Aft deck:   39.14 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Quarter deck:   15.43 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      20.72 ft / 6.32 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 111.0 %
      - Above water (accommodation/working, high = better): 158.0 %
   Waterplane Area: 39,274 Square feet or 3,649 Square metres
   Displacement factor (Displacement / loading): 106 %
   Structure weight / hull surface area: 136 lbs/sq ft or 662 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.04
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room



1298t  - Electric Drives

109t - 1908 FC
25t - NF Devices
25t - LR Radio

20t - Additional DC Equipment

[TacCovert4]

The Emergency 1914 GTB-Z program was considered a success.  However, concerns were brought up that the 1914 program GTBs focused too heavily on gun firepower and torpedo mounts at the expense of speed.  Accepting that 500t GTBs are unlikely to fare well in direct action against 1000t or 1500t screening destroyers, a new speed-focused GTB design is put forth for 1916.  Gun Armament has been downgraded to 70mm guns from 100mm guns, giving high rates of fire for fighting other torpedocraft while accepting the reduced capability against destroyers.  Torpedo armament is reduced by one, but places two tubes in forward-firing positions to allow for direct-fire of its primary armament against capital ships instead of the turn-broadside fire of the previous class.

TB-X, Aztec Torpedo Boat laid down 1916

Displacement:
   500 t light; 515 t standard; 569 t normal; 613 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (289.95 ft / 286.75 ft) x 22.97 ft x (7.38 / 7.75 ft)
   (88.38 m / 87.40 m) x 7.00 m  x (2.25 / 2.36 m)

Armament:
      3 - 2.76" / 70.0 mm 50.0 cal guns - 11.09lbs / 5.03kg shells, 200 per gun
     Quick firing guns in deck mounts, 1916 Model
     3 x Single mounts on centreline ends, majority forward
      1 raised mount - superfiring
      8 - 0.31" / 8.0 mm 70.0 cal guns - 0.02lbs / 0.01kg shells, 2,000 per gun
     Machine guns in deck mounts, 1916 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 33 lbs / 15 kg

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 18,982 shp / 14,161 Kw = 32.25 kts
   Range 2,950nm at 12.00 kts
   Bunker at max displacement = 97 tons

Complement:
   57 - 75

Cost:
   £0.103 million / $0.413 million

Distribution of weights at normal displacement:
   Armament: 7 tons, 1.3 %
      - Guns: 7 tons, 1.3 %
   Machinery: 311 tons, 54.6 %
   Hull, fittings & equipment: 166 tons, 29.1 %
   Fuel, ammunition & stores: 69 tons, 12.2 %
   Miscellaneous weights: 16 tons, 2.8 %
      - On freeboard deck: 15 tons
      - Above deck: 1 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     147 lbs / 67 Kg = 14.1 x 2.8 " / 70 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 0.7 ft / 0.2 m
   Roll period: 11.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.11
   Seaboat quality  (Average = 1.00): 0.79

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.410 / 0.420
   Length to Beam Ratio: 12.49 : 1
   'Natural speed' for length: 16.93 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 76
   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 %,  11.98 ft / 3.65 m,  11.15 ft / 3.40 m
      - Forward deck:   30.00 %,  11.15 ft / 3.40 m,  9.02 ft / 2.75 m
      - Aft deck:   35.00 %,  9.02 ft / 2.75 m,  8.37 ft / 2.55 m
      - Quarter deck:   15.00 %,  8.37 ft / 2.55 m,  8.37 ft / 2.55 m
      - Average freeboard:      9.62 ft / 2.93 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): 127.3 %
   Waterplane Area: 4,078 Square feet or 379 Square metres
   Displacement factor (Displacement / loading): 39 %
   Structure weight / hull surface area: 22 lbs/sq ft or 108 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.17
      - Overall: 0.54
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather


9t 1 x 3 x 533mm TT Centerline behind bridge
6t 2 x 1 x 533mm TT Forward (fixed mount)

1t - 1908 Fire Control

Trials Speed - 35kt

[The Rock Doctor]

This could certainly be an annoying threat in coastal waters.

[TacCovert4]

This could certainly be an annoying threat in coastal waters.

That's pretty much the evolution I'm going for.  The first gen GTBs had 100mm guns and were 'stand-in DDs' because of wartime losses.  This generation of GTB is aiming to maximize the actual advantages of the GTB over the MTB. 

Namely:

-3x range
-FC so that they can launch torpedoes from much further out than the crude arrangements on MTBs
-Seakeeping that can keep them operational in sea states that are beyond those for MTBs (MTBs start having trouble at 3 or 4, these should be good to 5 maybe 6 before they start fighting to keep the ship going)
-FC for the guns, they can sting a DD or pretty generally wreck MTBs in hunter/killer operations
-Oil turbines are quieter than petrol engines for night operations at speed

[TacCovert4]

A view of the Royal Aztec Navy's Capital Ships.  From top to bottom:  Sultan Ali-Class BC, Implacable Class BB, Caribbean Class BC

[TacCovert4]

A view of the RAN's Destroyers.  From top:  Scimitar Class, DD-1 Class (all sunk), GTB-Z class, GMB-A mk 2 and GMB-A Classes.