Aztec Ship Designs 1918-1920

TacCovert4 · April 10, 2021, 07:22:17 PM

When working on designs for a proposed 1500t cruiser, the designer of the 'surprising' SC-1 class has an epiphany. His Scout Cruiser had proven to be unsuccessful as a fleet scout or even as a fleet screening vessel. However, its small size, high speed, and long range had all been excellent traits for commerce raiding. Looking at turbines even now coming into service, a proposal for a follow on class is put forth. The major difference being that the follow on ship has more speed, more operational range, and more firepower than the SC-1 class.....but on 1500 tons:

Hammerhead, Aztec Destroyer-ish? laid down 1918

Displacement:
   1,500 t light; 1,562 t standard; 1,905 t normal; 2,180 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (391.10 ft / 387.14 ft) x 32.48 ft x (12.58 / 13.80 ft)
   (119.21 m / 118.00 m) x 9.90 m x (3.83 / 4.21 m)

Armament:
6 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 200 per gun
     Quick firing guns in deck mounts, 1918 Model
     3 x Twin mounts on centreline ends, majority aft
      1 raised mount aft - superfiring
1 - 2.76" / 70.0 mm 50.0 cal gun - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air gun in deck mount, 1918 Model
     1 x Single mount on centreline, forward deck centre
      1 raised mount
4 - 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 Single mounts on sides, evenly spread
Weight of broadside 205 lbs / 93 kg

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 34,129 shp / 25,460 Kw = 32.00 kts
   Range 7,100nm at 14.00 kts
   Bunker at max displacement = 617 tons

Complement:
   143 - 187

Cost:
   £0.410 million / $1.641 million

Distribution of weights at normal displacement:
   Armament: 35 tons, 1.8 %
     - Guns: 35 tons, 1.8 %
   Machinery: 1,010 tons, 53.0 %
   Hull, fittings & equipment: 401 tons, 21.0 %
   Fuel, ammunition & stores: 405 tons, 21.3 %
   Miscellaneous weights: 55 tons, 2.9 %
     - Hull above water: 4 tons
     - On freeboard deck: 24 tons
     - Above deck: 27 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     458 lbs / 208 Kg = 15.0 x 3.9 " / 100 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.38
   Metacentric height 1.6 ft / 0.5 m
   Roll period: 10.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.19
   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): 0.422 / 0.440
   Length to Beam Ratio: 11.92 : 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 %, 14.76 ft / 4.50 m, 13.78 ft / 4.20 m
     - Forward deck:   30.00 %, 13.78 ft / 4.20 m, 13.12 ft / 4.00 m
     - Aft deck:   35.00 %, 13.12 ft / 4.00 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:      12.37 ft / 3.77 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 177.6 %
      - Above water (accommodation/working, high = better): 129.5 %
   Waterplane Area: 7,849 Square feet or 729 Square metres
   Displacement factor (Displacement / loading): 73 %
   Structure weight / hull surface area: 29 lbs/sq ft or 143 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.89
      - Overall: 0.52
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

4t - 1912 FC

25t - LR Radio

24t - 2 x 3 x 18in TT on Centerline, 2 x Reload Salvo

2t - Crew Comfort Improvements

Note: At 'lone operational cruise' of 10kts, range is 14,700nm

The Rock Doctor · April 10, 2021, 07:50:57 PM

This could be a nuisance.

A small thing, but I'm thinking a couple more machine guns on each side. Good for threatening or covering specific parts of a target while it's being boarded.

TacCovert4 · April 10, 2021, 08:13:15 PM

Quote from: The Rock Doctor on April 10, 2021, 07:50:57 PM
This could be a nuisance.

A small thing, but I'm thinking a couple more machine guns on each side. Good for threatening or covering specific parts of a target while it's being boarded.

Good point. I can probably add at least 2 if not 4 ore 12mm mg, or drop down to 8mm mg and increase the number.

A lot of compromise is in this design of course. For 1918 getting a ship to this level of cruising performance on that tonnage is going to be problematic. Plus, as a nod to the commerce warfare aspect, I've opted for the 18in torpedo but in quantity, rather than the heavyweight 21in torpedo I could do. 18in should be sufficient for putting down a ship, or making attacks on commercial shipping or fleet trains.

The Rock Doctor · April 10, 2021, 08:22:25 PM

Yeah, the torpedo selection makes sense to me. The average civilian freighter will not do well eating even a single 18", so fewer 21" would be overkill.

TacCovert4 · April 11, 2021, 06:25:58 AM

Revised per Rocky's Suggestion. Double the number of 12mm MGs, in single rather than twin mounts to give more points of fire for covering ships being boarded.

Hammerhead, Aztec Destroyer-ish? laid down 1918

Displacement:
   1,500 t light; 1,562 t standard; 1,905 t normal; 2,180 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (391.10 ft / 387.14 ft) x 32.48 ft x (12.58 / 13.80 ft)
   (119.21 m / 118.00 m) x 9.90 m x (3.83 / 4.21 m)

Armament:
6 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 200 per gun
     Quick firing guns in deck mounts, 1918 Model
     3 x Twin mounts on centreline ends, majority aft
      1 raised mount aft - superfiring
1 - 2.76" / 70.0 mm 50.0 cal gun - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air gun in deck mount, 1918 Model
     1 x Single mount on centreline, forward deck centre
      1 raised mount
8 - 0.47" / 12.0 mm 70.0 cal guns - 0.07lbs / 0.03kg shells, 2,000 per gun
     Machine guns in deck mounts, 1918 Model
     8 x Single mounts on sides, evenly spread
Weight of broadside 205 lbs / 93 kg

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 34,129 shp / 25,460 Kw = 32.00 kts
   Range 7,100nm at 14.00 kts
   Bunker at max displacement = 617 tons

Complement:
   143 - 187

Cost:
   £0.410 million / $1.641 million

Distribution of weights at normal displacement:
   Armament: 35 tons, 1.8 %
     - Guns: 35 tons, 1.8 %
   Machinery: 1,010 tons, 53.0 %
   Hull, fittings & equipment: 400 tons, 21.0 %
   Fuel, ammunition & stores: 405 tons, 21.3 %
   Miscellaneous weights: 55 tons, 2.9 %
     - Hull above water: 4 tons
     - On freeboard deck: 24 tons
     - Above deck: 27 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     458 lbs / 208 Kg = 15.0 x 3.9 " / 100 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.38
   Metacentric height 1.6 ft / 0.5 m
   Roll period: 10.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.19
   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): 0.422 / 0.440
   Length to Beam Ratio: 11.92 : 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 %, 14.76 ft / 4.50 m, 13.78 ft / 4.20 m
     - Forward deck:   30.00 %, 13.78 ft / 4.20 m, 13.12 ft / 4.00 m
     - Aft deck:   35.00 %, 13.12 ft / 4.00 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:      12.37 ft / 3.77 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 177.6 %
      - Above water (accommodation/working, high = better): 129.5 %
   Waterplane Area: 7,849 Square feet or 729 Square metres
   Displacement factor (Displacement / loading): 73 %
   Structure weight / hull surface area: 29 lbs/sq ft or 143 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.89
      - Overall: 0.52
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

4t - 1912 FC

25t - LR Radio

24t - 2 x 3 x 18in TT on Centerline, 2 x Reload Salvo

2t - Crew Comfort Improvements

Note: At 'lone operational cruise' of 10kts, range is 14,700nm

TacCovert4 · April 11, 2021, 06:32:47 AM

Naturally with a 6 x 100mm design, there's a competing 130mm gunned variant. The 130 being the 'new' primary gun for secondary batteries and destroyers due to its heavier punch and 3km longer visually confirmable (FC) range. The downside is that ammunition capacity is half that of the smaller gunned variant and rate of fire is going to be half or slightly less than half.

Hammerhead, Aztec Destroyer-ish? laid down 1918

Displacement:
   1,500 t light; 1,564 t standard; 1,907 t normal; 2,182 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (391.10 ft / 387.14 ft) x 32.48 ft x (12.58 / 13.80 ft)
   (119.21 m / 118.00 m) x 9.90 m x (3.83 / 4.21 m)

Armament:
3 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck mounts, 1918 Model
     3 x Single mounts on centreline ends, majority aft
      1 raised mount aft - superfiring
1 - 2.76" / 70.0 mm 50.0 cal gun - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air gun in deck mount, 1918 Model
     1 x Single mount on centreline, forward deck centre
      1 raised mount
8 - 0.47" / 12.0 mm 70.0 cal guns - 0.07lbs / 0.03kg shells, 2,000 per gun
     Machine guns in deck mounts, 1918 Model
     8 x Single mounts on sides, evenly spread
Weight of broadside 225 lbs / 102 kg

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 34,157 shp / 25,481 Kw = 32.00 kts
   Range 7,100nm at 14.00 kts
   Bunker at max displacement = 618 tons

Complement:
   143 - 187

Cost:
   £0.411 million / $1.646 million

Distribution of weights at normal displacement:
   Armament: 44 tons, 2.3 %
     - Guns: 44 tons, 2.3 %
   Machinery: 1,008 tons, 52.9 %
   Hull, fittings & equipment: 389 tons, 20.4 %
   Fuel, ammunition & stores: 407 tons, 21.4 %
   Miscellaneous weights: 58 tons, 3.0 %
     - Hull above water: 7 tons
     - On freeboard deck: 24 tons
     - Above deck: 27 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     449 lbs / 203 Kg = 6.7 x 5.1 " / 130 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.36
   Metacentric height 1.6 ft / 0.5 m
   Roll period: 10.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.21
   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): 0.422 / 0.440
   Length to Beam Ratio: 11.92 : 1
   'Natural speed' for length: 19.68 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   20.00 %, 14.76 ft / 4.50 m, 13.12 ft / 4.00 m
     - Forward deck:   30.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
     - Aft deck:   35.00 %, 13.12 ft / 4.00 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:      12.19 ft / 3.72 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 177.8 %
      - Above water (accommodation/working, high = better): 128.0 %
   Waterplane Area: 7,851 Square feet or 729 Square metres
   Displacement factor (Displacement / loading): 72 %
   Structure weight / hull surface area: 29 lbs/sq ft or 143 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.86
      - Overall: 0.52
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

5t - 1912 FC

25t - LR Radio

24t - 2 x 3 x 18in TT on Centerline, 2 x Reload Salvo

4t - Crew Comfort Improvements

Jefgte · April 11, 2021, 06:55:48 AM

Reserve weight could be useful...

TacCovert4 · April 11, 2021, 07:29:17 AM

Quote from: Jefgte on April 11, 2021, 06:55:48 AM
Reserve weight could be useful...

Well when I consider "crew comfort " options I consider them not as built in systems so much as compartments not already dedicated to normal shipboard operations. So thef crew comfort would basically be an enlisted lounge, or in the case of this ship, probably a stockroom with chocolate and other comfort items since 4t is a bit small for a lounge.

I have one variant of this with twin instead of triple launchers and thus 8 torpedoes instead of 12. Results in 12t or so of crew comfort apace, which could be important for a ship this size expected to operate solo for between 20 and 50 days on the high seas without refueling. Potentially 6 months or more with periodic at sea refueling.

TacCovert4 · April 16, 2021, 06:42:23 PM

With the Norse coming out of a long-term period of isolationism, the Sultanate's engineers and planners see an opportunity to exploit the turbulent balance of power with new capital ship designs. One Engineer, a transplant by the name of Tillman, proposes that the Sultanate aim for the most powerful ships it can build:

Raptorus Rex, Aztec Battleship laid down 1919

Displacement:
   43,976 t light; 46,484 t standard; 49,335 t normal; 51,615 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (752.08 ft / 748.03 ft) x 118.11 ft x (27.92 / 29.05 ft)
   (229.23 m / 228.00 m) x 36.00 m x (8.51 / 8.85 m)

Armament:
15 - 14.17" / 360 mm 45.0 cal guns - 1,435.69lbs / 651.22kg shells, 110 per gun
     Breech loading guns in turret on barbette mounts, 1919 Model
     5 x 3-gun mounts on centreline, evenly spread
      2 raised mounts
24 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1919 Model
     12 x Twin mounts on sides, evenly spread
      4 raised mounts
8 - 2.76" / 70.0 mm 50.0 cal guns - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1919 Model
     8 x Single mounts on centreline, evenly spread
      4 raised mounts
32 - 0.47" / 12.0 mm 70.0 cal guns - 0.07lbs / 0.03kg shells, 1,500 per gun
     Machine guns in deck mounts, 1919 Model
     16 x Single mounts on sides, evenly spread
Weight of broadside 23,329 lbs / 10,582 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.8" / 350 mm   557.74 ft / 170.00 m   16.40 ft / 5.00 m
   Ends:   3.15" / 80 mm   118.11 ft / 36.00 m   16.40 ft / 5.00 m
     72.18 ft / 22.00 m Unarmoured ends
     Main Belt covers 115 % of normal length

- Torpedo Bulkhead - Additional damage containing bulkheads:
      1.57" / 40 mm   557.74 ft / 170.00 m   27.13 ft / 8.27 m
   Beam between torpedo bulkheads 98.43 ft / 30.00 m

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   13.8" / 350 mm   4.72" / 120 mm      13.8" / 350 mm
   2nd:   2.76" / 70 mm   1.18" / 30 mm      2.76" / 70 mm

- Armoured deck - multiple decks:
   For and Aft decks: 5.12" / 130 mm
   Forecastle: 0.00" / 0 mm Quarter deck: 3.54" / 90 mm

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

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 106,274 shp / 79,280 Kw = 26.00 kts
   Range 8,000nm at 14.00 kts
   Bunker at max displacement = 5,131 tons

Complement:
   1,654 - 2,151

Cost:
   £9.298 million / $37.193 million

Distribution of weights at normal displacement:
   Armament: 4,889 tons, 9.9 %
     - Guns: 4,889 tons, 9.9 %
   Armour: 17,098 tons, 34.7 %
     - Belts: 5,643 tons, 11.4 %
     - Torpedo bulkhead: 882 tons, 1.8 %
     - Armament: 4,176 tons, 8.5 %
     - Armour Deck: 6,123 tons, 12.4 %
     - Conning Towers: 274 tons, 0.6 %
   Machinery: 3,774 tons, 7.6 %
   Hull, fittings & equipment: 16,623 tons, 33.7 %
   Fuel, ammunition & stores: 5,359 tons, 10.9 %
   Miscellaneous weights: 1,592 tons, 3.2 %
     - Hull below water: 953 tons
     - Hull above water: 359 tons
     - Above deck: 280 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     71,722 lbs / 32,533 Kg = 50.4 x 14.2 " / 360 mm shells or 11.4 torpedoes
   Stability (Unstable if below 1.00): 1.15
   Metacentric height 8.3 ft / 2.5 m
   Roll period: 17.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.60
   Seaboat quality (Average = 1.00): 1.06

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.700 / 0.704
   Length to Beam Ratio: 6.33 : 1
   'Natural speed' for length: 27.35 kts
   Power going to wave formation at top speed: 50 %
   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:   15.40 %, 22.97 ft / 7.00 m, 22.97 ft / 7.00 m
     - Forward deck:   30.00 %, 22.97 ft / 7.00 m, 21.33 ft / 6.50 m
     - Aft deck:   39.20 %, 21.33 ft / 6.50 m, 19.69 ft / 6.00 m
     - Quarter deck:   15.40 %, 19.69 ft / 6.00 m, 19.69 ft / 6.00 m
     - Average freeboard:      21.25 ft / 6.48 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): 173.0 %
   Waterplane Area: 70,814 Square feet or 6,579 Square metres
   Displacement factor (Displacement / loading): 105 %
   Structure weight / hull surface area: 212 lbs/sq ft or 1,034 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

1103t - Electric Drives
489t - 1912 FC
25t - LR Radio
25t - Night Fighting Devices
100t - Builder's Reserve

Decks:
Main: 100mm w/30mm Splinter
Q: 70mm w/20mm Splinter
End Belt covers QD/Steering-Propulsion Gear

eltf177 · April 17, 2021, 09:34:26 AM

Miscellaneous weight does not balance.

TacCovert4 · April 17, 2021, 10:22:47 AM

Ahh, didn't update the notes on below waterline tonnage to reflect the change down in speed.

TacCovert4 · April 21, 2021, 07:45:47 AM

With 1918 being the first year in which the new 1500t classes can be laid down, proposals are made for a 'fleet destroyer'. Given the Aztec fleet arrangements, the large destroyers in the navy are principally used as DD leaders and tasked with fighting against enemy scouting or screening destroyers and screening the fleet from torpedo boats. Secondarily they are to be a backstop force in the large 'torpedo attack' squadrons that the fleet runs (mixed GTBs and MTBs). While they 'may' be multi-role, it's not a design requirement, and current submarine tech is such that there is not any significant ASW kit available in the RAN anyway.

The first, a multi-role design:

DD-D, Aztec Destroyer laid down 1918

Displacement:
   1,500 t light; 1,579 t standard; 1,816 t normal; 2,006 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (391.53 ft / 387.14 ft) x 30.51 ft x (12.43 / 13.33 ft)
   (119.34 m / 118.00 m) x 9.30 m x (3.79 / 4.06 m)

Armament:
5 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck mounts, 1918 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     1 x Single mount on centreline, aft deck forward
1 - 2.76" / 70.0 mm 50.0 cal gun - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air gun in deck mount, 1918 Model
     1 x Single mount on centreline, forward deck aft
      1 raised mount
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 366 lbs / 166 kg

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

- Conning towers: Forward 1.18" / 30 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 36,232 shp / 27,029 Kw = 32.72 kts
   Range 4,980nm at 14.00 kts
   Bunker at max displacement = 427 tons

Complement:
   138 - 180

Cost:
   £0.418 million / $1.672 million

Distribution of weights at normal displacement:
   Armament: 71 tons, 3.9 %
     - Guns: 71 tons, 3.9 %
   Armour: 19 tons, 1.1 %
     - Armament: 15 tons, 0.8 %
     - Conning Tower: 4 tons, 0.2 %
   Machinery: 977 tons, 53.8 %
   Hull, fittings & equipment: 386 tons, 21.3 %
   Fuel, ammunition & stores: 316 tons, 17.4 %
   Miscellaneous weights: 46 tons, 2.5 %
     - Hull below water: 5 tons
     - Hull above water: 5 tons
     - On freeboard deck: 32 tons
     - Above deck: 4 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     377 lbs / 171 Kg = 5.6 x 5.1 " / 130 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.24
   Metacentric height 1.3 ft / 0.4 m
   Roll period: 11.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.47
   Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.433 / 0.446
   Length to Beam Ratio: 12.69 : 1
   'Natural speed' for length: 19.68 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   20.00 %, 16.40 ft / 5.00 m, 16.40 ft / 5.00 m
     - Forward deck:   30.00 %, 16.40 ft / 5.00 m, 16.40 ft / 5.00 m
     - Aft deck:   35.00 %, 8.20 ft / 2.50 m, 8.20 ft / 2.50 m
     - Quarter deck:   15.00 %, 8.20 ft / 2.50 m, 8.20 ft / 2.50 m
     - Average freeboard:      12.30 ft / 3.75 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 185.7 %
      - Above water (accommodation/working, high = better): 123.0 %
   Waterplane Area: 7,433 Square feet or 691 Square metres
   Displacement factor (Displacement / loading): 63 %
   Structure weight / hull surface area: 30 lbs/sq ft or 147 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.99
      - Overall: 0.53
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

24t - 2x3x 21in HW TT on Centerline
8t - 80 x ASW Harpoons and Lockers (planned for refit to other ASW weapons at future date)

9t - 1912 FC
5t - Space Set Aside for Hydrophones

TacCovert4 · April 21, 2021, 07:46:55 AM

And the Second, a more single-purpose screening vessel designed to fight destroyers and torpedo boats and contribute against larger vessels with a heavier torpedo armament:

DD-13, Aztec Destroyer laid down 1918

Displacement:
   1,500 t light; 1,566 t standard; 1,803 t normal; 1,993 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (391.71 ft / 387.14 ft) x 30.51 ft x (12.43 / 13.33 ft)
   (119.39 m / 118.00 m) x 9.30 m x (3.79 / 4.06 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
1 - 2.76" / 70.0 mm 50.0 cal gun - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air gun in deck mount, 1918 Model
     1 x Single mount on centreline, forward deck aft
      1 raised mount
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 335 lbs / 152 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.06" / 27 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 35,923 shp / 26,799 Kw = 32.70 kts
   Range 5,000nm at 14.00 kts
   Bunker at max displacement = 427 tons

Complement:
   137 - 179

Cost:
   £0.413 million / $1.650 million

Distribution of weights at normal displacement:
   Armament: 56 tons, 3.1 %
     - Guns: 56 tons, 3.1 %
   Armour: 12 tons, 0.7 %
     - Armament: 12 tons, 0.7 %
   Machinery: 968 tons, 53.7 %
   Hull, fittings & equipment: 396 tons, 22.0 %
   Fuel, ammunition & stores: 303 tons, 16.8 %
   Miscellaneous weights: 67 tons, 3.7 %
     - Hull above water: 3 tons
     - On freeboard deck: 36 tons
     - Above deck: 28 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     375 lbs / 170 Kg = 12.3 x 3.9 " / 100 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 1.2 ft / 0.4 m
   Roll period: 11.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.49
   Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.430 / 0.443
   Length to Beam Ratio: 12.69 : 1
   'Natural speed' for length: 19.68 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   20.00 %, 17.06 ft / 5.20 m, 16.40 ft / 5.00 m
     - Forward deck:   30.00 %, 16.40 ft / 5.00 m, 16.40 ft / 5.00 m
     - Aft deck:   35.00 %, 8.20 ft / 2.50 m, 8.20 ft / 2.50 m
     - Quarter deck:   15.00 %, 8.20 ft / 2.50 m, 8.20 ft / 2.50 m
     - Average freeboard:      12.36 ft / 3.77 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 183.6 %
      - Above water (accommodation/working, high = better): 123.6 %
   Waterplane Area: 7,416 Square feet or 689 Square metres
   Displacement factor (Displacement / loading): 63 %
   Structure weight / hull surface area: 30 lbs/sq ft or 146 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.99
      - Overall: 0.53
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

36t - 3x3x 21in HW TT on Centerline

6t - 1912 FC

The Rock Doctor · April 21, 2021, 09:50:41 AM

I have doubts about six gun mounts and three torpedo carriages all on the centreline.

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

TacCovert4 · April 21, 2021, 10:30:32 AM

Quote from: The Rock Doctor on April 21, 2021, 09:50:41 AM
I have doubts about six gun mounts and three torpedo carriages all on the centreline.

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

Torpedo carriages would be 1 centerline between the midships AA gun and surface gun, both of which are raised mounts to account for the torpedo mount, and a pair on the sides abeam of the aft superstructure/superfiring mount.

When I'm bringing tonnage back up on a design after the range numbers have been fiddled, I have a bad habit of adding length. I'll have to adjust to get the L/B back straight.