Aztec Ship Designs 1918-1920

[Jefgte]

Length to Beam Ratio: 12.69 : 1

From Rocky:

Note also the very high length to beam ratio...

Yes, You are over the rules.
=> Length to Beam Ratio: 12 : 1

[TacCovert4]

Fixed the L-B issue.  Also fixed Rocky's mention of too many things centerline.  Added a second AA gun and moved them to the main deck at the break, torpedoes behind with the midships raised main mount between them.

Future plans for this class could include AA Destroyer, among other things.  Functionally the other 'pseudo fletcher' option has the same L-B issue, but it's a minor fiddle with dimensions to fix that and nothing else need change on that design as a potential candidate.


DD-D, Aztec Destroyer laid down 1918

Displacement:
   1,500 t light; 1,567 t standard; 1,804 t normal; 1,993 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (391.62 ft / 387.14 ft) x 32.32 ft x (12.31 / 13.16 ft)
   (119.37 m / 118.00 m) x 9.85 m  x (3.75 / 4.01 m)

Armament:
      10 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 150 per gun
     Quick firing guns in deck mounts, 1918 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     1 x Twin mount on centreline, aft deck forward
      1 raised mount aft
      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, forward deck aft
      8 - 0.47" / 12.0 mm 70.0 cal guns - 0.07lbs / 0.03kg shells, 3,000 per gun
     Machine guns in deck mounts, 1918 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 346 lbs / 157 kg

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

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 35,353 shp / 26,373 Kw = 32.60 kts
   Range 5,000nm at 14.00 kts
   Bunker at max displacement = 426 tons

Complement:
   137 - 179

Cost:
   £0.413 million / $1.650 million

Distribution of weights at normal displacement:
   Armament: 59 tons, 3.3 %
      - Guns: 59 tons, 3.3 %
   Armour: 11 tons, 0.6 %
      - Armament: 11 tons, 0.6 %
   Machinery: 964 tons, 53.4 %
   Hull, fittings & equipment: 411 tons, 22.8 %
   Fuel, ammunition & stores: 304 tons, 16.9 %
   Miscellaneous weights: 55 tons, 3.0 %
      - Hull above water: 3 tons
      - On freeboard deck: 24 tons
      - Above deck: 28 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     405 lbs / 183 Kg = 13.3 x 3.9 " / 100 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.26
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 11.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.40
   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): 0.410 / 0.424
   Length to Beam Ratio: 11.98 : 1
   'Natural speed' for length: 19.68 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 %,  16.73 ft / 5.10 m,  16.73 ft / 5.10 m
      - Forward deck:   30.00 %,  16.73 ft / 5.10 m,  16.73 ft / 5.10 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:      12.63 ft / 3.85 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 183.1 %
      - Above water (accommodation/working, high = better): 132.7 %
   Waterplane Area: 7,748 Square feet or 720 Square metres
   Displacement factor (Displacement / loading): 65 %
   Structure weight / hull surface area: 31 lbs/sq ft or 151 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.01
      - Overall: 0.53
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

24t - 2x3x 21in HW TT on Centerline

6t - 1912 FC

Trials Speed 33.5kts

[TacCovert4]

His Majesty, Ali, Sultan of Aztecs, has issued a requirement for a Royal Yacht for the purposes of conveying their majesties, diplomats, and other vital non-combat interests in times of peace and war.  This project will be a ship of the highest quality, with numerous stringent requirements for the yards that normally produce fleet tenders for the Royal Aztec Navy.  The first proposal, from Veracruz Shipbuilding and based on a design from a Japanese Naval Architect, is as follows:

Aztec Empire Imperial Yatch laid down 1918

Displacement:
    5,991 t light; 6,205 t standard; 8,271 t normal; 9,924 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
    (510.00 ft / 510.00 ft) x 51.00 ft x (21.00 / 24.25 ft)
    (155.45 m / 155.45 m) x 15.54 m  x (6.40 / 7.39 m)

Armament:
      8 - 5.12" / 130 mm 45.0 cal guns - 67.62lbs / 30.67kg shells, 150 per gun
      Quick firing guns in deck and hoist mounts, 1918 Model
      4 x Twin mounts on centreline, evenly spread
        2 raised mounts
      4 - 2.76" / 70.0 mm 45.0 cal guns - 10.56lbs / 4.79kg shells, 150 per gun
      Anti-air guns in deck mounts, 1918 Model
      4 x Single mounts on sides, evenly spread
      Weight of broadside 583 lbs / 265 kg

Armour:
   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    1.00" / 25 mm          -            1.00" / 25 mm

Machinery:
    Oil fired boilers, steam turbines,
    Electric motors, 2 shafts, 35,169 shp / 26,236 Kw = 26.00 kts
    Range 10,000nm at 18.00 kts
    Bunker at max displacement = 3,719 tons

Complement:
    433 - 563

Cost:
    £0.882 million / $3.527 million

Distribution of weights at normal displacement:
    Armament: 125 tons, 1.5 %
       - Guns: 125 tons, 1.5 %
    Armour: 12 tons, 0.1 %
       - Armament: 12 tons, 0.1 %
    Machinery: 1,269 tons, 15.3 %
    Hull, fittings & equipment: 3,085 tons, 37.3 %
    Fuel, ammunition & stores: 2,280 tons, 27.6 %
    Miscellaneous weights: 1,500 tons, 18.1 %
       - Hull below water: 400 tons
       - Hull above water: 1,000 tons
       - On freeboard deck: 50 tons
       - Above deck: 50 tons

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      10,495 lbs / 4,761 Kg = 156.6 x 5.1 " / 130 mm shells or 1.8 torpedoes
    Stability (Unstable if below 1.00): 1.04
    Metacentric height 2.0 ft / 0.6 m
    Roll period: 15.2 seconds
    Steadiness    - As gun platform (Average = 50 %): 93 %
            - Recoil effect (Restricted arc if above 1.00): 0.31
    Seaboat quality  (Average = 1.00): 1.32

Hull form characteristics:
    Hull has raised forecastle, raised quarterdeck ,
      a normal bow and a cruiser stern
    Block coefficient (normal/deep): 0.530 / 0.551
    Length to Beam Ratio: 10.00 : 1
    'Natural speed' for length: 22.58 kts
    Power going to wave formation at top speed: 50 %
    Trim (Max stability = 0, Max steadiness = 100): 70
    Bow angle (Positive = bow angles forward): 0.00 degrees
    Stern overhang: 0.00 ft / 0.00 m
    Freeboard (% = length of deck as a percentage of waterline length):
                Fore end,     Aft end
       - Forecastle:    20.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
       - Forward deck:    30.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
       - Aft deck:    35.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
       - Quarter deck:    15.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
       - Average freeboard:        16.10 ft / 4.91 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 75.0 %
        - Above water (accommodation/working, high = better): 109.7 %
    Waterplane Area: 17,816 Square feet or 1,655 Square metres
    Displacement factor (Displacement / loading): 181 %
    Structure weight / hull surface area: 106 lbs/sq ft or 520 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 1.33
        - Longitudinal: 1.68
        - Overall: 1.36
    Excellent machinery, storage, compartmentation space
    Adequate accommodation and workspace room
    Ship has slow, easy roll, a good, steady gun platform
    Good seaboat, rides out heavy weather easily

[The Rock Doctor]

Looks rather heavily armed for a yacht.

[TacCovert4]

Looks rather heavily armed for a yacht.

Well, have you met our neighbors?  1 we've been locked in war with since time immemorial.  The other we just fought a rather costly war with.  Protecting the Royal Personage is sort of important.  You will note that the ship doesn't have armor, and that compared to its peer cruiser it is slower and substantially less heavily armed.  It's armed enough to fend off an attack on it, not to be useful as a combatant in a fight.

[TacCovert4]

The second, a different design, from Tampico Yards:

Royal Sovereign, Aztec Empire Imperial Yacht laid down 1918

Displacement:
   5,301 t light; 5,533 t standard; 8,256 t normal; 10,435 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (492.03 ft / 488.85 ft) x 54.13 ft x (20.60 / 24.81 ft)
   (149.97 m / 149.00 m) x 16.50 m  x (6.28 / 7.56 m)

Armament:
      8 - 5.12" / 130 mm 45.0 cal guns - 67.61lbs / 30.67kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1918 Model
     4 x Twin mounts on centreline ends, evenly spread
      1 raised mount aft - superfiring
      3 - 2.76" / 70.0 mm 45.0 cal guns - 10.55lbs / 4.79kg shells, 300 per gun
     Anti-air guns in deck mounts, 1918 Model
     4 x Single mounts on centreline, evenly spread
      16 - 0.47" / 12.0 mm 70.0 cal guns - 0.06lbs / 0.03kg shells, 2,500 per gun
     Machine guns in deck mounts, 1918 Model
     8 x Single mounts on sides, aft evenly spread
      Weight of broadside 573 lbs / 260 kg

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 41,952 shp / 31,297 Kw = 27.00 kts
   Range 10,000nm at 20.00 kts
   Bunker at max displacement = 4,902 tons

Complement:
   432 - 562

Cost:
   £0.902 million / $3.608 million

Distribution of weights at normal displacement:
   Armament: 124 tons, 1.5 %
      - Guns: 124 tons, 1.5 %
   Machinery: 1,513 tons, 18.3 %
   Hull, fittings & equipment: 2,186 tons, 26.5 %
   Fuel, ammunition & stores: 2,955 tons, 35.8 %
   Miscellaneous weights: 1,478 tons, 17.9 %
      - Hull below water: 500 tons
      - Hull above water: 800 tons
      - On freeboard deck: 75 tons
      - Above deck: 103 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     10,509 lbs / 4,767 Kg = 156.8 x 5.1 " / 130 mm shells or 1.7 torpedoes
   Stability (Unstable if below 1.00): 1.32
   Metacentric height 3.3 ft / 1.0 m
   Roll period: 12.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - 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): 0.530 / 0.556
   Length to Beam Ratio: 9.03 : 1
   'Natural speed' for length: 22.11 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 66
   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 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Forward deck:   30.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 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:      13.94 ft / 4.25 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 83.5 %
      - Above water (accommodation/working, high = better): 108.9 %
   Waterplane Area: 18,126 Square feet or 1,684 Square metres
   Displacement factor (Displacement / loading): 165 %
   Structure weight / hull surface area: 80 lbs/sq ft or 390 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.14
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

368t BW - Electric Drives
132t BW - Additional Firefighting Equipment and DC Pumps
100t AW - Royal Quarters and Offices
100t AW - Guard Quarters (50 Personnel
100t AW - Royal Staff Quarters (50 Personnel
100t AW - 20 Bed Hospital with 2 Surgical Suites
400t AW - Royal Multipurpose Space
50t AD - Main and Alternate LR Wireless
13t AD - 1912 FC
40t AD - Royal Observation Platform (Flying Bridge)
25t OD - Crane for Royal Conveyance (amidships-aft of main superstructure, atop vehicle bay)
50t OD - Bay for Royal Conveyance (vehicle bay)

[TacCovert4]

And an alternate design from Tampico Yards, note the primarily aft armament for defense, which also maximizes the space forward for royal quarters despite the slightly smaller size.

Royal Sovereign, Aztec Empire Imperial Yacht laid down 1918

Displacement:
   5,294 t light; 5,510 t standard; 8,236 t normal; 10,416 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (492.03 ft / 488.85 ft) x 55.77 ft x (19.95 / 24.03 ft)
   (149.97 m / 149.00 m) x 17.00 m  x (6.08 / 7.33 m)

Armament:
      6 - 5.12" / 130 mm 45.0 cal guns - 67.61lbs / 30.67kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1918 Model
     3 x Twin mounts on centreline ends, majority aft
      1 raised mount aft - superfiring
      3 - 2.76" / 70.0 mm 45.0 cal guns - 10.55lbs / 4.79kg shells, 300 per gun
     Anti-air guns in deck mounts, 1918 Model
     4 x Single mounts on centreline, evenly spread
      16 - 0.47" / 12.0 mm 70.0 cal guns - 0.06lbs / 0.03kg shells, 2,500 per gun
     Machine guns in deck mounts, 1918 Model
     8 x Single mounts on sides, aft evenly spread
      Weight of broadside 438 lbs / 199 kg

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 42,070 shp / 31,384 Kw = 27.00 kts
   Range 10,000nm at 20.00 kts
   Bunker at max displacement = 4,906 tons

Complement:
   431 - 561

Cost:
   £0.877 million / $3.507 million

Distribution of weights at normal displacement:
   Armament: 95 tons, 1.2 %
      - Guns: 95 tons, 1.2 %
   Machinery: 1,518 tons, 18.4 %
   Hull, fittings & equipment: 2,206 tons, 26.8 %
   Fuel, ammunition & stores: 2,942 tons, 35.7 %
   Miscellaneous weights: 1,475 tons, 17.9 %
      - Hull below water: 500 tons
      - Hull above water: 800 tons
      - On freeboard deck: 75 tons
      - Above deck: 100 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     10,967 lbs / 4,975 Kg = 163.6 x 5.1 " / 130 mm shells or 1.7 torpedoes
   Stability (Unstable if below 1.00): 1.37
   Metacentric height 3.6 ft / 1.1 m
   Roll period: 12.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.10
   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): 0.530 / 0.556
   Length to Beam Ratio: 8.76 : 1
   'Natural speed' for length: 22.11 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 66
   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 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Forward deck:   30.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 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:      13.94 ft / 4.25 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 82.4 %
      - Above water (accommodation/working, high = better): 112.5 %
   Waterplane Area: 18,676 Square feet or 1,735 Square metres
   Displacement factor (Displacement / loading): 168 %
   Structure weight / hull surface area: 80 lbs/sq ft or 389 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.10
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

368t BW - Electric Drives
132t BW - Additional Firefighting Equipment and DC Pumps
100t AW - Royal Quarters and Offices
100t AW - Guard Quarters (50 Personnel
100t AW - Royal Staff Quarters (50 Personnel
100t AW - 20 Bed Hospital with 2 Surgical Suites
400t AW - Royal Multipurpose Space
50t AD - Main and Alternate LR Wireless
10t AD - 1912 FC
40t AD - Royal Observation Platform (Flying Bridge)
25t OD - Crane for Royal Conveyance (amidships-aft of main superstructure, atop vehicle bay)
50t OD - Bay for Royal Conveyance (vehicle bay)

[The Rock Doctor]

I feel like the sultan might like the seakeeping of the first and the stability of the second.

The fittings make sense, including the royal conveyance.

Is the final order being paid as a warship or an aux?

[TacCovert4]

I feel like the sultan might like the seakeeping of the first and the stability of the second.

The fittings make sense, including the royal conveyance.

Is the final order being paid as a warship or an aux?

Pacific Rim Shipbuilding in Acapulco has yet to produce their bid, it'll be a bit different.  Well, somewhat different, probably smaller.

And yeah, I figured a hangar big enough to fit about 3 staff cars or touring cars, and a crane and fittings capable of transferring them to the pier, would be sort of 'useful' for a royal yacht.

Final order is anticipated as an Auxiliary rather than a warship, It'll have the new vogue superstructure that's been put on the newest capital ships, but the ship isn't a warship.  Hence armaments are being strictly kept under the limit, and in part that's resulted in all of the 130mm armed variants coming with no armor whatsoever, not even splinter-proof shields for the guns, though they do have lightweight weather structures that can be assembled to cover the breech area and basically fair over the ugly part of the gun for aesthetic purposes when not in use (which is anticipated as ALL the time).  The more extensive AA/close defense suite is seen as being important, the main battery is what each yard is deeming sufficient to protect the royal personage.  High cruising speed with long range to keep voyages short in time duration at the expense of fuel.....a luxury a monarch would endulge.  The top speed is relatively high, but that's for power generation to make sure that even on partial power she maintains a relatively stout speed.  The seakeeping isn't as a concern as it would be for a cruiser, as the top speed is like the gun batteries.....present but only for emergency use.  On the cruising speed of 20kts, the one with 'barely' sufficient seakeeping is still bombing around with 1.50 seakeeping.

[TacCovert4]

And from Pacific Rim Shipbuilding:

Royal Sovereign, Aztec Empire Imperial Yacht laid down 1918

Displacement:
   4,822 t light; 5,010 t standard; 7,613 t normal; 9,695 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (492.17 ft / 488.85 ft) x 55.77 ft x (18.44 / 22.34 ft)
   (150.01 m / 149.00 m) x 17.00 m  x (5.62 / 6.81 m)

Armament:
      8 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1918 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      3 - 2.76" / 70.0 mm 45.0 cal guns - 10.55lbs / 4.79kg shells, 300 per gun
     Anti-air guns in deck mounts, 1918 Model
     4 x Single mounts on centreline, evenly spread
      16 - 0.47" / 12.0 mm 70.0 cal guns - 0.06lbs / 0.03kg shells, 2,500 per gun
     Machine guns in deck mounts, 1918 Model
     8 x Single mounts on sides, aft evenly spread
      Weight of broadside 291 lbs / 132 kg

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 40,122 shp / 29,931 Kw = 27.00 kts
   Range 10,000nm at 20.00 kts
   Bunker at max displacement = 4,685 tons

Complement:
   406 - 529

Cost:
   £0.803 million / $3.210 million

Distribution of weights at normal displacement:
   Armament: 71 tons, 0.9 %
      - Guns: 71 tons, 0.9 %
   Machinery: 1,447 tons, 19.0 %
   Hull, fittings & equipment: 2,121 tons, 27.9 %
   Fuel, ammunition & stores: 2,790 tons, 36.7 %
   Miscellaneous weights: 1,183 tons, 15.5 %
      - Hull below water: 411 tons
      - Hull above water: 620 tons
      - On freeboard deck: 75 tons
      - Above deck: 77 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     11,214 lbs / 5,086 Kg = 367.5 x 3.9 " / 100 mm shells or 1.8 torpedoes
   Stability (Unstable if below 1.00): 1.46
   Metacentric height 4.0 ft / 1.2 m
   Roll period: 11.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.07
   Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.530 / 0.557
   Length to Beam Ratio: 8.76 : 1
   'Natural speed' for length: 22.11 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 63
   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 %,  18.86 ft / 5.75 m,  18.37 ft / 5.60 m
      - Forward deck:   30.00 %,  18.37 ft / 5.60 m,  18.37 ft / 5.60 m
      - Aft deck:   35.00 %,  10.17 ft / 3.10 m,  10.17 ft / 3.10 m
      - Quarter deck:   15.00 %,  10.17 ft / 3.10 m,  10.17 ft / 3.10 m
      - Average freeboard:      14.31 ft / 4.36 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 80.9 %
      - Above water (accommodation/working, high = better): 122.3 %
   Waterplane Area: 18,676 Square feet or 1,735 Square metres
   Displacement factor (Displacement / loading): 175 %
   Structure weight / hull surface area: 77 lbs/sq ft or 378 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.07
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

361t BW - Electric Drives
50t BW - Additional Firefighting Equipment and DC Pumps
100t AW - Royal Quarters and Offices
120t AW - Royal Staff/Guard Spaces (60 Persons)
400t AW - Royal Multipurpose Space
50t AD - Main and Alternate LR Wireless
7t AD - 1912 FC
20t AD - Royal Observation Platform (Flying Bridge)
25t OD - Crane for Royal Conveyance (amidships-aft of main superstructure, atop vehicle bay)
50t OD - Bay for Royal Conveyance (vehicle bay)

[Kaiser Kirk]

Interesting,
I haven't even considered a Royal yacht.
I think I had a vague idea that one of the capital
ships with a flag bridge would be used if needed
for transport for diplomatic purposes or a tour. 
Perhaps I should indulge in a yacht as well.

[The Rock Doctor]

I figure there's an old stately thing in service for the Union.  I'll play with a replacement sometime.

[TacCovert4]

Interesting,
I haven't even considered a Royal yacht.
I think I had a vague idea that one of the capital
ships with a flag bridge would be used if needed
for transport for diplomatic purposes or a tour. 
Perhaps I should indulge in a yacht as well.

Not really an 'indulgence' for the RAN.  Using Sultan Ali, the battlecruiser, as the yacht for Sultan Ali the 8th would be an indulgence.  The 'royal yacht' thing is really an outshoot of how the Caicos war ended.  The Sultan, as well as diplomatic staff, was shuffled to Bermuda on at the time the biggest and fastest....and only.....long range ships of the Navy.  Which happened to be SC-1 class scout cruisers, little 3000t affairs with accommodations that would be austere on a good day.  Even now, a few years out, to take a cruiser or battlecruiser or battleship off out of operational rotation to function as a consular ship or royal yacht would mean that the RAN would have to completely shuffle an entire fleet's readiness and maintenance schedules.

In this instance, the RAN would kill to have enough cruisers in the 8-12,000t range to take on the rolls of 'show the flag' and 'consular ship' and 'royal yacht'.  But it's not anticipated that there will be adequate numbers until at least the late 20s.  And if there will need to be at least one ship in the interim to handle the role, then why not use the under-utilized commercial yards to build ships for the purpose that have all the fancy things that would be nice to have on such a vessel but aren't functional on a cruiser.  Since it is an RAN vessel, and let's be honest the Sultan is a bit of a Warrior King, it's got to have a 'cruiser' look.  And as the Sultanate has both near enemies and near-rivals that were enemies only a couple of years ago, armament isn't entirely for show, though it is glossed over compared to its peer-era cruisers (hence 100mm and 130mm guns rather than the standard 150mm guns on proper cruisers in this class, or the 180s being put on the new cruisers).

The speed is more a function of the cruising speeds desired, and the potential need to evade enemy (Mayan) warships.  The high cruise and long range requirement makes this ship extremely efficient as a liner.  And has the ability to cross the Atlantic in record time, or the Pacific in 2 weeks, which is very useful for consular work, or for a monarch who wants to get to the outlying colonies for a visit or to a conference.

[Kaiser Kirk]

Particularly after the Roman war, I get the Aztec fleet can't afford to divert major units, that will change as you rebuild, but will take time.

The fast courier across the Atlantic is the same role the Parthian Royal Road has,  and we have one for Atlantic command, and one Pacific Command,
but the Royal Road is not meant for VIPs

It's mainly one of those fun things of seeing the differing needs and viewpoints different strategic considerations cause.

[TacCovert4]

Quite.

And on the subject of building up, the Eagle class has been a nice successful class of light cruiser.  The Weapon class looks like it too will be a nice successful class of Frigate (or General Purpose, heavy, cruiser).  The issue, however, lies in the fact that the larger cruisers eat greatly into the budget at a time where thoughts need to be seriously put towards the 1919 building of fast battleships or an improved class of battlecruisers.  With that in mind, a 6000t cruiser is in the cards as it's more cost effective.  However, the 150mm guns are an older design, and the 180s are considered to be desirable for both their longer effective range and their better performance in cruiser on cruiser combat.  A 100mm secondary can be shoehorned in for anti-DD work in conjunction with the 180mm guns. 

And thus, a design with 5 single 180s, on roughly the tonnage of the Eagle Class, is commissioned for design:

Eagle, Aztec Corvette laid down 1918

Displacement:
   5,995 t light; 6,249 t standard; 7,095 t normal; 7,773 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (491.79 ft / 488.02 ft) x 54.13 ft x (18.08 / 19.40 ft)
   (149.90 m / 148.75 m) x 16.50 m  x (5.51 / 5.91 m)

Armament:
      5 - 7.09" / 180 mm 50.0 cal guns - 188.39lbs / 85.45kg shells, 150 per gun
     Quick firing guns in deck and hoist mounts, 1918 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     1 x Single mount on centreline, forward deck centre
      8 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 200 per gun
     Quick firing guns in deck mounts, 1918 Model
     4 x Twin mounts on sides, aft deck forward
      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 centreline, evenly spread
      2 raised mounts
      16 - 0.47" / 12.0 mm 70.0 cal guns - 0.07lbs / 0.03kg shells, 2,500 per gun
     Machine guns in deck mounts, 1918 Model
     8 x Twin mounts on sides, evenly spread
      Weight of broadside 1,224 lbs / 555 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.95" / 75 mm   360.89 ft / 110.00 m   16.40 ft / 5.00 m
   Ends:   1.26" / 32 mm     82.02 ft / 25.00 m   16.40 ft / 5.00 m
     45.11 ft / 13.75 m Unarmoured ends
     Main Belt covers 114 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.15" / 80 mm   1.26" / 32 mm      2.95" / 75 mm
   2nd:   2.36" / 60 mm   1.26" / 32 mm            -

   - Protected deck - single deck:
   For and Aft decks: 1.26" / 32 mm
   Forecastle: 0.00" / 0 mm  Quarter deck: 1.26" / 32 mm

   - Conning towers: Forward 2.95" / 75 mm, Aft 0.12" / 3 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 58,495 shp / 43,637 Kw = 30.00 kts
   Range 8,000nm at 14.00 kts
   Bunker at max displacement = 1,524 tons

Complement:
   386 - 502

Cost:
   £1.239 million / $4.954 million

Distribution of weights at normal displacement:
   Armament: 323 tons, 4.6 %
      - Guns: 323 tons, 4.6 %
   Armour: 1,284 tons, 18.1 %
      - Belts: 772 tons, 10.9 %
      - Armament: 103 tons, 1.5 %
      - Armour Deck: 384 tons, 5.4 %
      - Conning Towers: 24 tons, 0.3 %
   Machinery: 2,110 tons, 29.7 %
   Hull, fittings & equipment: 2,170 tons, 30.6 %
   Fuel, ammunition & stores: 1,101 tons, 15.5 %
   Miscellaneous weights: 107 tons, 1.5 %
      - Hull above water: 17 tons
      - On freeboard deck: 24 tons
      - Above deck: 66 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6,273 lbs / 2,845 Kg = 35.3 x 7.1 " / 180 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 2.5 ft / 0.8 m
   Roll period: 14.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.49
   Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.520 / 0.531
   Length to Beam Ratio: 9.02 : 1
   'Natural speed' for length: 22.09 kts
   Power going to wave formation at top speed: 60 %
   Trim (Max stability = 0, Max steadiness = 100): 65
   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 %,  21.33 ft / 6.50 m,  19.69 ft / 6.00 m
      - Forward deck:   30.00 %,  19.69 ft / 6.00 m,  18.04 ft / 5.50 m
      - Aft deck:   35.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Quarter deck:   15.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Average freeboard:      18.75 ft / 5.72 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 112.0 %
      - Above water (accommodation/working, high = better): 163.0 %
   Waterplane Area: 17,929 Square feet or 1,666 Square metres
   Displacement factor (Displacement / loading): 106 %
   Structure weight / hull surface area: 80 lbs/sq ft or 393 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.84
      - Longitudinal: 1.51
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

25t - LR Radio
25t - Night Fighting Devices
33t - 1908 FC
24t - 2 x 3 x 21in HW TT on sides

End Belt is Aft over Engineering/Steering Spaces