Parthian vessels 1916 onwards

[Kaiser Kirk]

This is another take on a 'Flight Deck Cruiser',
the previous was 8x180, and I was able to eek 6x 255 out of that,
but felt that being able to field 8x 230mm would be a good intermediate
choice.

This should be able to range out in front of the fleet and provide scout and fighter services
to the cruiser screen, while being dangerous to virtually all ships that might be able to
catch it, and being able to survive encounters at night or in bad weather.

It is very tempting to drop the speed 1 knot and free up 300 tons.
That could fit more belt/deck armor, or maybe a TDS.
But my cruisers are generally over 29 knots, and the Zemaka ACs are even faster.


Avio  Aristabara, Parthian Fighter Carrier laid down 1925

Displacement:
   14,000 t light; 14,722 t standard; 15,836 t normal; 16,728 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (590.12 ft / 583.99 ft) x 72.18 ft x (26.25 / 27.36 ft)
   (179.87 m / 178.00 m) x 22.00 m  x (8.00 / 8.34 m)

Armament:
      8 - 9.06" / 230 mm 44.0 cal guns - 392.42lbs / 178.00kg shells, 160 per gun
     Breech loading guns in turret on barbette mounts, 1925 Model
     1 x 4-gun mount on centreline, forward deck forward
     1 x 4-gun mount on centreline, forward deck aft
      16 - 4.72" / 120 mm 43.0 cal guns - 55.12lbs / 25.00kg shells, 200 per gun
     Quick firing guns in casemate mounts, 1925 Model
     16 x Single mounts on sides, evenly spread
      16 hull mounts in casemates- Limited use in heavy seas
      12 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Anti-air guns in deck mounts, 1925 Model
     12 x Single mounts on sides, aft evenly spread
      8 - 0.59" / 15.0 mm 60.0 cal guns - 0.11lbs / 0.05kg shells, 3,000 per gun
     Machine guns in deck mounts, 1925 Model
     2 x 2 row quad mounts on sides amidships
      2 double raised mounts
      Weight of broadside 4,101 lbs / 1,860 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.54" / 90 mm   379.59 ft / 115.70 m   10.73 ft / 3.27 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length
     Main Belt inclined -12.00 degrees (positive = in)

   - Hull void:
      0.00" / 0 mm     0.00 ft / 0.00 m   0.00 ft / 0.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5.31" / 135 mm   2.95" / 75 mm      3.54" / 90 mm
   2nd:   0.31" / 8 mm   0.31" / 8 mm      0.31" / 8 mm
   3rd:   0.31" / 8 mm         -               -
   4th:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 1.97" / 50 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 1.97" / 50 mm

   - Conning towers: Forward 1.38" / 35 mm, Aft 1.38" / 35 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 77,985 shp / 58,177 Kw = 29.00 kts
   Range 7,220nm at 14.00 kts
   Bunker at max displacement = 2,007 tons

Complement:
   705 - 917

Cost:
   £3.782 million / $15.129 million

Distribution of weights at normal displacement:
   Armament: 957 tons, 6.0 %
      - Guns: 957 tons, 6.0 %
   Armour: 1,967 tons, 12.4 %
      - Belts: 604 tons, 3.8 %
      - Armament: 340 tons, 2.1 %
      - Armour Deck: 986 tons, 6.2 %
      - Conning Towers: 37 tons, 0.2 %
   Machinery: 2,532 tons, 16.0 %
   Hull, fittings & equipment: 6,253 tons, 39.5 %
   Fuel, ammunition & stores: 1,836 tons, 11.6 %
   Miscellaneous weights: 2,290 tons, 14.5 %
      - Hull below water: 1,121 tons
      - Hull void weights: 110 tons
      - Hull above water: 828 tons
      - On freeboard deck: 60 tons
      - Above deck: 171 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     26,287 lbs / 11,924 Kg = 70.8 x 9.1 " / 230 mm shells or 2.4 torpedoes
   Stability (Unstable if below 1.00): 1.17
   Metacentric height 4.1 ft / 1.2 m
   Roll period: 15.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.79
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has rise aft of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.501 / 0.508
   Length to Beam Ratio: 8.09 : 1
   'Natural speed' for length: 24.17 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 13.00 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 %,  26.57 ft / 8.10 m,  24.11 ft / 7.35 m
      - Forward deck:   30.00 %,  24.11 ft / 7.35 m,  21.65 ft / 6.60 m
      - Aft deck:   35.00 %,  39.70 ft / 12.10 m,  39.70 ft / 12.10 m
      - Quarter deck:   15.00 %,  39.70 ft / 12.10 m,  39.70 ft / 12.10 m
      - Average freeboard:      31.73 ft / 9.67 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 84.9 %
      - Above water (accommodation/working, high = better): 242.6 %
   Waterplane Area: 28,110 Square feet or 2,612 Square metres
   Displacement factor (Displacement / loading): 129 %
   Structure weight / hull surface area: 123 lbs/sq ft or 602 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.84
      - Longitudinal: 4.73
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Aristabara = spear bearer

For the first vessel, a 16 plane troop, at a planned 75% servicibility
would take 20 aircraft.  Of these, 2 x Fighter Lances, and 2x Scout Lances will be initially embarked. One spare per lance would be embarked.   If fighter launch rates promise to get more than 8 fighters into combat, the number of scouts can be reduced.

Gun Deck : 6.6m
Single  Hanger : +5.5 = 12.1m
Aircraft : 20 x 80t = 1600t
Needed Waterplane = 1300 m2  x2 for Flight deck cruiser penalty : 2600


A and C turrets are on the same level, but widely spaced. The bow curves up to much for dead on forward fire. However, on broadside or at long and moderate ranges, the barrel elevation necessary will allow both to bear directly forward

The "Fore" and "Aft" Cons are really twin islands sited on either side of the forward edge of the flight deck, which cantilevers out over C turret.
A flying bridge arching over the flight deck connects them
for an H shape.

The 230L44 gun can engage enemy vessels at all ranges, and can easily penetrate cruisers at a number of ranges, while potent against enemy armored cruisers met at night.

Capable of sustained 4-gun ladders, the two turrets are widely spaced, but not superimposed. So "C" can not fire dead ahead at short ranges, but must elevate over "A".

The guns are viewed as useful in bad weather, or night, or if the planes are out of commision, or if they have already been launched.

Casements mounted along the ships side provide destroyer defense.

57mm guns arae mounted in sponsons along the edge of the flight deck

Quad15mm are mounted high up the con towers, on the seaward side.

The main belt covers from +1.6 to - 1.6 and is outsloped 12 degrees outboard.

3.2/cos(12) = 3.271 = 3.27

Flight Deck : The main flight deck takes 89m (292ft) with a cantilevered forward section overhanging 'C' turret. For the USN, a clear flight deck of at least 234ft was desired.

Misc Wt
Resv :110

AD
96t FC
25t LR Radio
0t SR Radio
10t SR radio - dedicated A/C control
25t Hulesmeyer device
25t Night fighting searchlights and gear

OD

10t  x2  catapults
50t  x2 elevators 25t. One aft, one at rear of Cats

HAW
800t  10x Fixed Wheel Aircraft
14t Additional Fire Suppression
14t CO2 Air Compressor AC

HBW
800t +10x Fixed Wheel Aircraft
178t  Torpedo Nets
15t    Enhanced Hydro
70t  Additional AVGAS in doublewall tanks (60/10)
30t  Additional Munitions
14t  Additional Fire Suppresion
14t  Additional pumps

12.10m Flight Deck
  6.60m   Weather Deck / Hanger Deck
  4.10m   Battery Deck (Casements)
  1.60m   Armor Deck, Top Main belt.
- 0.90m 
            -1.6m  Bottom main belt
- 3.40m
- 6.90m  Engineering
-7.68m   Doublebottom.

[The Rock Doctor]

That's not too bad.  I've been playing with similar ideas but not making them work as well.

[Kaiser Kirk]

In minewarfare the Parthians are comparatively well equipped.
There are 60 of the  regular navy coastal Minesweepers, 64+ of the multi-role aux patrol sloops, and 15 of the new aux coastal minesweepers.
...but 2 minelayers.
Well, some of the old cruisers were fitted as minelayers too.

But in the future I will need to build some minelayers,
the first series focused on base defense, but with a 4400nm+ range to move around easily.
then later I will try to field a handful of very high speed offensive minelayers
for night time work.

Why does it have guns and armor ?
It's Parthian....

ML-3 D, Parthia Fleet Minelayer laid down 1925

Displacement:
   660 t light; 707 t standard; 814 t normal; 899 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (163.42 ft / 160.76 ft) x 32.81 ft (Bulges 39.37 ft) x (9.19 / 10.04 ft)
   (49.81 m / 49.00 m) x 10.00 m (Bulges 12.00 m)  x (2.80 / 3.06 m)

Armament:
      2 - 5.12" / 130 mm 50.0 cal guns - 70.55lbs / 32.00kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1925 Model
     2 x Single mounts on centreline, forward evenly spread
      1 raised mount
      4 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Anti-air guns in deck mounts, 1925 Model
     2 x 2-gun mounts on sides amidships
      16 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 3,000 per gun
     Anti-air guns in deck mounts, 1925 Model
     4 x 2 row quad mounts on side ends, evenly spread
      4 raised mounts
      Weight of broadside 169 lbs / 77 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.31" / 8 mm         -               -
   2nd:   0.31" / 8 mm         -               -
   3rd:   0.31" / 8 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 1.38" / 35 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 1.38" / 35 mm

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

Machinery:
   Coal and oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 2,142 shp / 1,598 Kw = 16.00 kts
   Range 4,800nm at 12.00 kts
   Bunker at max displacement = 192 tons (23% coal)

Complement:
   76 - 99

Cost:
   £0.165 million / $0.660 million

Distribution of weights at normal displacement:
   Armament: 51 tons, 6.2 %
      - Guns: 51 tons, 6.2 %
   Armour: 124 tons, 15.2 %
      - Bulges: 28 tons, 3.4 %
      - Armament: 4 tons, 0.5 %
      - Armour Deck: 89 tons, 11.0 %
      - Conning Tower: 2 tons, 0.3 %
   Machinery: 71 tons, 8.7 %
   Hull, fittings & equipment: 190 tons, 23.4 %
   Fuel, ammunition & stores: 154 tons, 18.9 %
   Miscellaneous weights: 224 tons, 27.5 %
      - Hull below water: 18 tons
      - Bulge void weights: 14 tons
      - Hull above water: 1 tons
      - On freeboard deck: 180 tons
      - Above deck: 11 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,509 lbs / 685 Kg = 22.5 x 5.1 " / 130 mm shells or 1.2 torpedoes
   Stability (Unstable if below 1.00): 1.35
   Metacentric height 1.6 ft / 0.5 m
   Roll period: 13.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.19
   Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.490 / 0.495
   Length to Beam Ratio: 4.08 : 1
   'Natural speed' for length: 12.68 kts
   Power going to wave formation at top speed: 64 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   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 %,  15.09 ft / 4.60 m,  15.09 ft / 4.60 m
      - Forward deck:   30.00 %,  15.09 ft / 4.60 m,  15.09 ft / 4.60 m
      - Aft deck:   35.00 %,  6.89 ft / 2.10 m,  6.89 ft / 2.10 m
      - Quarter deck:   15.00 %,  6.89 ft / 2.10 m,  6.89 ft / 2.10 m
      - Average freeboard:      10.99 ft / 3.35 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 53.8 %
      - Above water (accommodation/working, high = better): 93.2 %
   Waterplane Area: 3,483 Square feet or 324 Square metres
   Displacement factor (Displacement / loading): 124 %
   Structure weight / hull surface area: 39 lbs/sq ft or 191 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.63
      - Longitudinal: 3.54
      - Overall: 0.75
   Caution: Hull subject to strain in open-sea
   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 class features a 1m deep anti-mine bulge on each side, covering the entire side, and meant to provide standoff distance to avoid crushing.

Rsv :14t

AD
6t FC
5t Nightfighting gear

OD
5t Paravanes
25t MSW gear
150t OD Minestowage aft

HABW
1t  CO2 Compressor AC

HBW
18 Turbogenerator


Decks
4.60 : Forecastle  Deck
2.10 : Main Deck
          -.4  lower edge protective deck
-1.4   : Engineering
-2.44 : 1m Double Bottom (blends into bulge)
-2.8 : Keel

[Jefgte]

...then later I will try to field a handful of very high speed offensive minelayers
for night time work.

Use a recent 32kts destroyer:
=> Lighten Weaponry remove some guns & torpedoes to free up tonnage for mines.

[TacCovert4]

...then later I will try to field a handful of very high speed offensive minelayers
for night time work.

Use a recent 32kts destroyer:
=> Lighten Weaponry remove some guns & torpedoes to free up tonnage for mines.

Keeping this in mind.   For either a dd run,  or my remaining eagle class.

[Kaiser Kirk]

I think the DD route may be best,
possibly just refit an old torpedo boat.

I tried a 3000 ton build with light guns and armor,
only managed 400 tons of mines and
fuel for a 48hour 26knot run.

While it would nice to have that utility,
at that cost it's quite a lot for a niche ship

[Kaiser Kirk]

Second effort at Jefgte's DD concept, I took my new Babr class and converted it to a minelayer.
The idea is something that can disrupt the enemy rear areas and create a threat they
have to respond to, tying up resources and complicating supply lines.

Only 70 mines vs. the 300 of the cruiser version, but 1500 vs 3000 tons.
Also lighter armament, no armor....
But much harder to catch, and a higher sustained speed (27 vs 22) over 48hrs.

But spending 6000 (one cruiser) for 4 of these rather than 12000 (2 cruisers) for 2
seems better for the sprawling Parthia.

But it can go 48 hours at 27 knots, or - presuming no breakdowns - 24hours at full speed.

Xwarg (Live Coal), Parthian Corvette Minelayer laid down 1925

Displacement:
   1,500 t light; 1,564 t standard; 1,865 t normal; 2,106 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (392.94 ft / 387.14 ft) x 36.75 ft x (10.93 / 11.88 ft)
   (119.77 m / 118.00 m) x 11.20 m  x (3.33 / 3.62 m)

Armament:
      3 - 4.72" / 120 mm 43.0 cal guns - 55.12lbs / 25.00kg shells, 220 per gun
     Quick firing guns in deck mounts, 1925 Model
     2 x Single mounts on centreline ends, evenly spread
      2 raised mounts
      4 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 350 per gun
     Anti-air guns in deck mounts, 1925 Model
     2 x 2-gun mounts on sides forward
      2 raised mounts
      8 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 2,500 per gun
     Anti-air guns in deck mounts, 1925 Model
     2 x 2 row quad mounts on centreline ends, evenly spread
      2 double raised mounts
      Weight of broadside 193 lbs / 87 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.31" / 8 mm         -               -
   3rd:   0.24" / 6 mm         -               -
   4th:   0.24" / 6 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 33,798 shp / 25,213 Kw = 31.90 kts
   Range 1,286nm at 27.00 kts
   Bunker at max displacement = 542 tons

Complement:
   141 - 184

Cost:
   £0.634 million / $2.536 million

Distribution of weights at normal displacement:
   Armament: 34 tons, 1.8 %
      - Guns: 34 tons, 1.8 %
   Armour: 3 tons, 0.1 %
      - Armament: 3 tons, 0.1 %
   Machinery: 943 tons, 50.6 %
   Hull, fittings & equipment: 431 tons, 23.1 %
   Fuel, ammunition & stores: 365 tons, 19.6 %
   Miscellaneous weights: 89 tons, 4.8 %
      - Hull void weights: 5 tons
      - Hull above water: 2 tons
      - On freeboard deck: 75 tons
      - Above deck: 8 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     541 lbs / 245 Kg = 10.3 x 4.7 " / 120 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.36
   Metacentric height 1.9 ft / 0.6 m
   Roll period: 11.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.15
   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): 0.420 / 0.436
   Length to Beam Ratio: 10.54 : 1
   'Natural speed' for length: 19.68 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: -3.28 ft / -1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  21.65 ft / 6.60 m,  19.03 ft / 5.80 m
      - Forward deck:   27.00 %,  19.03 ft / 5.80 m,  16.73 ft / 5.10 m
      - Aft deck:   38.00 %,  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:      13.36 ft / 4.07 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 169.1 %
      - Above water (accommodation/working, high = better): 148.7 %
   Waterplane Area: 8,869 Square feet or 824 Square metres
   Displacement factor (Displacement / loading): 79 %
   Structure weight / hull surface area: 31 lbs/sq ft or 149 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.89
      - Overall: 0.53
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

Xwarg : " Live Coal" 

Based on the hull of the new Babr class Corvette (oceanic destroyer), this is designed for a
high speed dash to lay mines in constested water.

A handful of guns are mounted for self defense.

The aft mount is raised to allow firing over the embarked mines on the stern.

The 542 hours of fuel allow for the following
speed choices

31.9 knots for 769nm in 24hours
30kts (80%power)  for 930nm in 31hours
29kts (66% power) for 1030nm in 35 hours
27kts (50% power) for 1280nm in 48 hours

This allows 640nm out and 640nm back in a two day raid to place mines in enemy waters.

Trial speed - 32.53

7160nm at 14knots (fleet speed)
1286
Geared Drives give +15% range.

5T - Construction reserve

AD:
2.5t - FC
0t - SR Radio
5t- NF Gear

OD:
5t - MS Paravanes
70t - 70 Mines

HAW
1.5t - CO2 Air Compressor AC

HBW

[Kaiser Kirk]

Interestingly a 'Cruiser' version of Xwarg would have a top speed of 29knots rather than 32.53,
but 27knots would be ~75% power, giving the same 48hr range at speed.
The Mines would go up to 110t - a 50% increase.

The lower top speed means a seakeeping of 1.22
Floatation doubles.

[Kaiser Kirk]

Back to the more local minelayer.
Reduced the armor to 25mm protective deck, and changed the guns from 2x130 to 3x120,
Alternately, I could replace "B" with an 118mm Howitzer for both attacking subs and shore bombardment.

The rear 120 is superimposed so it is well above the mines & rails on deck.
Minestorage drops from 150 to 120... if a hostile ship is engaged, shedding the mines is high on the list.

Trimmed other things... and TA DAH... reduces from 660tons to 500 tons.
Which means I can build one in 6 months, which I prefer to tracking tonnage over two years.

It still has minesweeping ability as a back up, or can be used as a shallow draft gunboat.
The gunboat mode would be increased by swapping the 118mm in.
Lastly, one could strip the mines off and store troops or equipment aft.
Or I could make it a micro-seaplane tender.

ML- 3 E, Parthia Fleet Minelayer laid down 1925

Displacement:
   500 t light; 546 t standard; 648 t normal; 729 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (163.42 ft / 160.76 ft) x 32.81 ft (Bulges 39.37 ft) x (8.53 / 9.39 ft)
   (49.81 m / 49.00 m) x 10.00 m (Bulges 12.00 m)  x (2.60 / 2.86 m)

Armament:
      3 - 4.72" / 120 mm 43.0 cal guns - 55.12lbs / 25.00kg shells, 250 per gun
     Quick firing guns in deck mounts, 1925 Model
     2 x Single mounts on centreline, forward evenly spread
      1 raised mount
     1 x Single mount on centreline, aft deck forward
      1 raised mount aft
      4 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Anti-air guns in deck mounts, 1925 Model
     2 x 2-gun mounts on sides amidships
      8 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 3,000 per gun
     Anti-air guns in deck mounts, 1925 Model
     2 x 2 row quad mounts on sides forward
      2 raised mounts
      Weight of broadside 193 lbs / 87 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.31" / 8 mm         -               -
   2nd:   0.31" / 8 mm         -               -
   3rd:   0.31" / 8 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 0.98" / 25 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 1.38" / 35 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 1,776 shp / 1,325 Kw = 16.00 kts
   Range 5,450nm at 12.00 kts
   Bunker at max displacement = 183 tons (23% coal)

Complement:
   63 - 83

Cost:
   £0.114 million / $0.457 million

Distribution of weights at normal displacement:
   Armament: 34 tons, 5.2 %
      - Guns: 34 tons, 5.2 %
   Armour: 66 tons, 10.2 %
      - Armament: 4 tons, 0.6 %
      - Armour Deck: 60 tons, 9.3 %
      - Conning Tower: 2 tons, 0.3 %
   Machinery: 59 tons, 9.1 %
   Hull, fittings & equipment: 163 tons, 25.2 %
   Fuel, ammunition & stores: 148 tons, 22.8 %
   Miscellaneous weights: 178 tons, 27.5 %
      - Hull below water: 15 tons
      - Bulge void weights: 8 tons
      - Hull above water: 1 tons
      - On freeboard deck: 150 tons
      - Above deck: 4 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,499 lbs / 680 Kg = 28.4 x 4.7 " / 120 mm shells or 1.3 torpedoes
   Stability (Unstable if below 1.00): 1.51
   Metacentric height 1.9 ft / 0.6 m
   Roll period: 12.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.13
   Seaboat quality  (Average = 1.00): 1.40

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.420 / 0.429
   Length to Beam Ratio: 4.08 : 1
   'Natural speed' for length: 12.68 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  15.09 ft / 4.60 m,  15.09 ft / 4.60 m
      - Forward deck:   30.00 %,  15.09 ft / 4.60 m,  15.09 ft / 4.60 m
      - Aft deck:   35.00 %,  6.89 ft / 2.10 m,  6.89 ft / 2.10 m
      - Quarter deck:   15.00 %,  6.89 ft / 2.10 m,  6.89 ft / 2.10 m
      - Average freeboard:      10.99 ft / 3.35 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 50.6 %
      - Above water (accommodation/working, high = better): 106.1 %
   Waterplane Area: 3,288 Square feet or 305 Square metres
   Displacement factor (Displacement / loading): 144 %
   Structure weight / hull surface area: 35 lbs/sq ft or 172 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.63
      - Longitudinal: 3.58
      - Overall: 0.75
   Caution: Hull subject to strain in open-sea
   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 class features a 1m deep anti-mine bulge on each side, covering the entire side, and meant to provide standoff distance to avoid crushing.

Rsv : 8

AD
4t FC


OD
5t Paravanes
25t MSW gear
120t OD Minestowage aft

HABW
1t  CO2 Compressor AC

HBW
15 Turbogenerator


Decks
4.60 : Forecastle  Deck
2.10 : Main Deck
          -.4  lower edge protective deck
-1.4   : Engineering
-1.99 : 0.6m Double Bottom (blends into bulge)
-2.0 : Keel

[Kaiser Kirk]

A probably not to be built ship,
Exploring the opportunity cost of a battlecruiser / fast battleship.
...the cost is quite high.

I think a Zemaka AC can do most of the same jobs for 60% the cost.
The Zemaka[i/]s can't reliably engage BCs 10,000 tons heavier,
but can take them at close ranges / night engagements.

Dahae, Parthian Battlecruiser laid down 1926

Displacement:
   33,000 t light; 35,105 t standard; 41,686 t normal; 46,950 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (656.17 ft / 649.61 ft) x 111.55 ft x (31.17 / 34.50 ft)
   (200.00 m / 198.00 m) x 34.00 m  x (9.50 / 10.52 m)

Armament:
      8 - 13.11" / 333 mm 44.0 cal guns - 1,433.01lbs / 650.00kg shells, 145 per gun
     Breech loading guns in turret on barbette mounts, 1926 Model
     2 x 4-gun mounts on centreline, forward evenly spread
      1 raised mount
      12 - 6.50" / 165 mm 44.0 cal guns - 143.30lbs / 65.00kg shells, 210 per gun
     Quick firing guns in turret on barbette mounts, 1926 Model
     6 x 2-gun mounts on sides, evenly spread
      12 - 3.54" / 90.0 mm 54.0 cal guns - 24.25lbs / 11.00kg shells, 510 per gun
     Anti-air guns in deck and hoist mounts, 1926 Model
     4 x Single mounts on side ends, evenly spread
      4 raised mounts
     2 x Single mounts on centreline ends, evenly spread
      2 double raised mounts
      12 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 1,000 per gun
     Anti-air guns in deck and hoist mounts, 1926 Model
     6 x 2-gun mounts on sides, evenly spread
      6 double raised mounts
      32 - 0.59" / 15.0 mm 70.0 cal guns - 0.12lbs / 0.05kg shells, 10,000 per gun
     Machine guns in deck mounts, 1926 Model
     8 x Twin mounts on sides, evenly spread
      8 raised mounts
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 13,558 lbs / 6,150 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   11.0" / 280 mm   422.24 ft / 128.70 m   16.40 ft / 5.00 m
   Ends:   1.57" / 40 mm   227.33 ft / 69.29 m   12.66 ft / 3.86 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -12.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      2.24" / 57 mm   422.24 ft / 128.70 m   29.89 ft / 9.11 m
   Beam between torpedo bulkheads 75.46 ft / 23.00 m

   - Hull void:
      0.00" / 0 mm     0.00 ft / 0.00 m   0.00 ft / 0.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.6" / 320 mm   5.91" / 150 mm      10.0" / 255 mm
   2nd:   5.91" / 150 mm   3.94" / 100 mm      4.92" / 125 mm
   3rd:   0.98" / 25 mm   0.98" / 25 mm      0.98" / 25 mm
   4th:   0.59" / 15 mm   0.31" / 8 mm      0.31" / 8 mm
   5th:   0.31" / 8 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 4.53" / 115 mm
   Forecastle: 1.57" / 40 mm  Quarter deck: 4.53" / 115 mm

   - Conning towers: Forward 12.60" / 320 mm, Aft 4.92" / 125 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 153,502 shp / 114,512 Kw = 29.00 kts
   Range 10,080nm at 20.00 kts
   Bunker at max displacement = 11,845 tons

Complement:
   1,458 - 1,896

Cost:
   £9.841 million / $39.364 million

Distribution of weights at normal displacement:
   Armament: 2,428 tons, 5.8 %
      - Guns: 2,428 tons, 5.8 %
   Armour: 11,814 tons, 28.3 %
      - Belts: 3,575 tons, 8.6 %
      - Torpedo bulkhead: 1,048 tons, 2.5 %
      - Armament: 2,337 tons, 5.6 %
      - Armour Deck: 4,400 tons, 10.6 %
      - Conning Towers: 454 tons, 1.1 %
   Machinery: 4,914 tons, 11.8 %
   Hull, fittings & equipment: 13,208 tons, 31.7 %
   Fuel, ammunition & stores: 8,686 tons, 20.8 %
   Miscellaneous weights: 637 tons, 1.5 %
      - Hull below water: 32 tons
      - Hull void weights: 100 tons
      - Hull above water: 32 tons
      - On freeboard deck: 155 tons
      - Above deck: 318 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     70,046 lbs / 31,773 Kg = 62.2 x 13.1 " / 333 mm shells or 11.8 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 8.3 ft / 2.5 m
   Roll period: 16.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.46
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.646 / 0.657
   Length to Beam Ratio: 5.82 : 1
   'Natural speed' for length: 25.49 kts
   Power going to wave formation at top speed: 60 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: -6.56 ft / -2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  32.48 ft / 9.90 m,  30.02 ft / 9.15 m
      - Forward deck:   35.00 %,  30.02 ft / 9.15 m,  27.56 ft / 8.40 m
      - Aft deck:   30.00 %,  19.36 ft / 5.90 m,  19.36 ft / 5.90 m
      - Quarter deck:   15.00 %,  19.36 ft / 5.90 m,  19.36 ft / 5.90 m
      - Average freeboard:      24.99 ft / 7.62 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 92.7 %
      - Above water (accommodation/working, high = better): 176.6 %
   Waterplane Area: 55,307 Square feet or 5,138 Square metres
   Displacement factor (Displacement / loading): 131 %
   Structure weight / hull surface area: 191 lbs/sq ft or 934 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.91
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

A Parthian Battlecruiser, roughly the same size
as the Stormbringer class, 3 knots faster,
but much more weakly armed and armored.

Intended to operate at higher speeds
around the battleline in penetration raids,
or operating on long penetration raids.

An additional role is to serve as a '2nd Class Battleship' in the territories, being able to deploy long distances at high speed.

Range is sufficient for 3 weeks at 20 knots, allowing
it to threaten an enormous area.

Intended to both match up against the older Byzantine BCs and the newer Japanese BCs. The armor is intended to be adequate at longer range, while the ships speed and endurance are meant to keep the ship from the shorter ranges where it would be vulnerable.

As extensive independent operations are foreseen,
a heavy battery to smash destroyers, or ward off aircraft is mounted.


AD
243t  Fire Control
25t  LR Radio
25t  Searchlight tower (NF)
25t Hulesmeyer proximity detector

OD
5t Paravanes
100t : 4x Armed Fighter Floatplanes
40t : 2x Scout Floatplanes
10t : 2x Catapults

HAW
32t Additional ventilation

HBW
32t Additional Pumps

[Kaiser Kirk]

So looking at 1925.1, I laid down a 14,500t version of the flight deck cruiser.
But the only version listed here was 14,000 tons.

Plus I consolidated my files from my laptop to my desktop.
...and seem to have not moved stuff from Feb and March, including the 14500.

So I took a stab at recreating it.
500 tons is not enough for a superimposed 'C' and the double hanger.
500 tons is not enough for a minimal TDS of 38mm.
So what was I spending that on ?
Well, I'm trying for 55-60mm deck armor.... so bumped that up from 50mm.
I wanted at least a 100mm belt, so bumped that up from 90mm
I want at least 1.10 stability, I'll shave that for smaller ones...so goosed the beam and dropped the BC.
Oh, and I'm trying for 8000nm range - I used to build in more as design reserve, but now the geared turbines do that.

Oh look, 500 tons heavier and meets all those parameters.
Yeah, guessing what I had was about this.

Avio Aristabara, Parthian Flight Deck Cruiser laid down 1925

Displacement:
   14,500 t light; 15,413 t standard; 16,679 t normal; 17,693 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (590.55 ft / 583.99 ft) x 74.64 ft x (26.57 / 27.79 ft)
   (180.00 m / 178.00 m) x 22.75 m  x (8.10 / 8.47 m)

Armament:
      8 - 9.06" / 230 mm 44.0 cal guns - 392.42lbs / 178.00kg shells, 260 per gun
     Breech loading guns in turret on barbette mounts, 1925 Model
     1 x 4-gun mount on centreline, forward deck forward
     1 x 4-gun mount on centreline, forward deck aft
      16 - 4.72" / 120 mm 43.0 cal guns - 55.12lbs / 25.00kg shells, 200 per gun
     Quick firing guns in casemate mounts, 1925 Model
     16 x Single mounts on sides, evenly spread
      16 hull mounts in casemates- Limited use in heavy seas
      12 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Anti-air guns in deck mounts, 1925 Model
     12 x Single mounts on sides, aft evenly spread
      8 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 3,000 per gun
     Breech loading guns in deck mounts, 1925 Model
     2 x 2 row quad mounts on sides amidships
      2 double raised mounts
      Weight of broadside 4,101 lbs / 1,860 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.94" / 100 mm   379.59 ft / 115.70 m   10.73 ft / 3.27 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length
     Main Belt inclined -12.00 degrees (positive = in)

   - Hull void:
      0.00" / 0 mm     0.00 ft / 0.00 m   0.00 ft / 0.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5.31" / 135 mm   2.95" / 75 mm      3.94" / 100 mm
   2nd:   0.31" / 8 mm   0.31" / 8 mm      0.31" / 8 mm
   3rd:   0.31" / 8 mm         -               -
   4th:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.17" / 55 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 2.17" / 55 mm

   - Conning towers: Forward 1.38" / 35 mm, Aft 1.38" / 35 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 80,996 shp / 60,423 Kw = 29.00 kts
   Range 8,010nm at 14.00 kts
   Bunker at max displacement = 2,280 tons

Complement:
   733 - 953

Cost:
   £3.884 million / $15.538 million

Distribution of weights at normal displacement:
   Armament: 957 tons, 5.7 %
      - Guns: 957 tons, 5.7 %
   Armour: 2,217 tons, 13.3 %
      - Belts: 676 tons, 4.1 %
      - Armament: 364 tons, 2.2 %
      - Armour Deck: 1,139 tons, 6.8 %
      - Conning Towers: 39 tons, 0.2 %
   Machinery: 2,630 tons, 15.8 %
   Hull, fittings & equipment: 6,391 tons, 38.3 %
   Fuel, ammunition & stores: 2,180 tons, 13.1 %
   Miscellaneous weights: 2,305 tons, 13.8 %
      - Hull below water: 1,121 tons
      - Hull void weights: 130 tons
      - Hull above water: 828 tons
      - On freeboard deck: 55 tons
      - Above deck: 171 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     26,982 lbs / 12,239 Kg = 72.7 x 9.1 " / 230 mm shells or 2.5 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 3.9 ft / 1.2 m
   Roll period: 15.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.97
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has rise aft of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.504 / 0.511
   Length to Beam Ratio: 7.82 : 1
   'Natural speed' for length: 24.17 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 13.00 degrees
   Stern overhang: -3.28 ft / -1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  26.61 ft / 8.11 m,  24.11 ft / 7.35 m
      - Forward deck:   30.00 %,  24.11 ft / 7.35 m,  21.65 ft / 6.60 m
      - Aft deck:   35.00 %,  39.70 ft / 12.10 m,  39.70 ft / 12.10 m
      - Quarter deck:   15.00 %,  39.70 ft / 12.10 m,  39.70 ft / 12.10 m
      - Average freeboard:      31.74 ft / 9.67 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 83.7 %
      - Above water (accommodation/working, high = better): 241.9 %
   Waterplane Area: 29,147 Square feet or 2,708 Square metres
   Displacement factor (Displacement / loading): 131 %
   Structure weight / hull surface area: 125 lbs/sq ft or 612 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.84
      - Longitudinal: 4.45
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Warning: Beam between bulkheads too wide

Avio Aristabara - 'From the skies spear bearer'

Flight Deck
A flight deck cruiser, it is expected to range ahead of the battleline with the scouting cruisers- both armored and normal. Gun combat may be a inevitable result.

A 16 plane troop, at a planned 75% servicability would take 20 aircraft.
Of these, 2x fighter lances (2x4) and
2x Scout/bomber  lances will be initially embarked.
One spare lance of 2 Fighters and 2 Scout Bombers will be embarked.

If fighter launch rates promise to get more than 8 fighters into combat the number of scouts can be reduced.

Gun Deck : 6.6m
Single Hanger + 5.5 m
Aircraft 20 desired = 20 x 80 = 1600 tons.
Needed Waterplane = 1300m2 x 2 for FDC = 2600
Actual Waterplane = 2703

The mainflight deck takes up 89m (292ft) with the cantilevered section extending it slightly. The USN in this period was seeking a clear flight deck of at least 234ft.

The 'Fore' and 'Aft' islands are actually two islands structures near the front of the flight deck, joined by a Flying Bridge in an "H".

The first crash barrier is before the H, but a large net between the rear of Islands serves as the final crash barrier. This can be reefed up to allow planes to pass beneath.

One elevator lifts planes between the H, where they can move forward to the hydraulic catapults. This also allows landed planes to taxi forward beyond the net and be taken down to the hanger.

The other elevator is at the aft end of the flight deck, bringing planes up to prep to launch and warm up on the deck. They then taxi forward to acutally take off.
Potentiallly they could start their take off run from the aft deck, but
Navigating the H structure when seeking to take off will not proove popular in the long run.

Future refits will likely fix that.




Guns
The 'A' and 'C' turrets are widely spaced on the foredeck, but 'C' is not superimposed. Rather a section of flight deck is cantelivered out to just overhang the top of 'C'.

If 'C' fires at shallow angles foreward, it will hit 'A' for several points off the bow. 'C' can still elevate and fire over 'A' for long distance shots' or fire at targets on the port or starboard quarters, to either side of 'A'.
Both 'A' and 'C' can of course engage on either beam.

The 230L44 gun can engage enemy vessels at all ranges, being lethal against cruisers at most ranges, and capable of engaging enemy armored cruisers encountered at night or in poor weather. The two turrets allow sustained 4 gun ladders.

The guns are viewed as useful whenever the planes are not available, night, poor weather, no planes, all planes launched...these conditions make the guns important.

Casements along the sides provide destroyer defense.

The 57mm guns are mounted in sponsons along the edges of the flight deck.

The Quad 15mm (2 paired GAST 15mms) are mounted high on the conning towers, on the seaward side.

The "Fore" and "Aft" cons are really twin islands sited on either side of the foreward edge of the flight deck, aft of 'C'. A flying bridge arching over the flight deck connects the two for an "H" shape.


Armor
The Belt armor covers from +1.6 to-1.6 and is angled 12 degrees outboard.
3.2m/cos(12) = 3.271 = 3.27

The deck armor will defeat splinters up to 300mm, and hits from most guns at all ranges.

Misc Wt.
Resv : 130t

AD
96t FC
25t LR radio
0t SR radio
10t SR radio - dedicated A/C control
25t Hulesmeyer device
25t Night Fighting searchlights and gear

OD
5t Paravanes
50t 2x hydraulic catapults

HAW
800t  10x Fixed Wheel Aircraft
14t Additional fire suppression
14t CO2 Air Compressor AC

HBW
800t  10x Fixed Wheel Aircraft
178t   Torpedo Nets
15t     Enhanced Hydrophones
70t    Additional AvGas in doublewall tanks (60t/10t)
30t    Additional munitions
14t    Additional fire suppression
14t    Additional pumps

12.10 Flight Deck
  6.60  Weather deck/Hanger Deck
  4.10  Battery Deck (Casements)
  1.60  Armor Deck, Top Main Belt
  -.90 
            -1.60   Bottom Main belt
-3.40
-6.90  Engineering
-7.27  Double Bottom

[Kaiser Kirk]

The discussion on max battlewagons led to the realization that I had not even TRIED
a 20x 435 vessel.
So while I Thought it was unwise, I did not know.

Now this is not a fully polished design, more proof of concept.

That concept is apparently really really big.
..and only takes 10 short years to build.
I would need a bigger dry dock though.

The belt is meant to be inclined,
The deck is meant to have a splinter layer below

I do need to explore using the enormous beam for an amid-ships runway....


Naiyoshangha, Parthia Behemoth laid down 1927

Displacement:
   109,802 t light; 117,645 t standard; 127,133 t normal; 134,723 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (984.25 ft / 984.25 ft) x 187.01 ft (Bulges 196.85 ft) x (32.81 / 34.61 ft)
   (300.00 m / 300.00 m) x 57.00 m (Bulges 60.00 m)  x (10.00 / 10.55 m)

Armament:
      20 - 17.13" / 435 mm 50.0 cal guns - 3,190.53lbs / 1,447.20kg shells, 140 per gun
     Breech loading guns in turret on barbette mounts, 1927 Model
     4 x 4-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     1 x 4-gun mount on centreline amidships (forward deck)
      20 - 6.50" / 165 mm 50.0 cal guns - 145.10lbs / 65.82kg shells, 150 per gun
     Breech loading guns in turret on barbette mounts, 1927 Model
     10 x 2-gun mounts on sides, evenly spread
      20 - 3.54" / 90.0 mm 45.0 cal guns - 22.43lbs / 10.18kg shells, 300 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     8 x 2-gun mounts on sides, evenly spread
      8 raised mounts
     2 x 2-gun mounts on centreline ends, evenly spread
      2 double raised mounts
      80 - 1.18" / 30.0 mm 70.0 cal guns - 0.92lbs / 0.42kg shells, 500 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     20 x 4-gun mounts on sides, evenly spread
      20 double raised mounts
      Weight of broadside 67,235 lbs / 30,497 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   17.7" / 450 mm   639.76 ft / 195.00 m   17.06 ft / 5.20 m
   Ends:   3.94" / 100 mm   344.46 ft / 104.99 m   16.40 ft / 5.00 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -15.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      3.54" / 90 mm   639.76 ft / 195.00 m   31.89 ft / 9.72 m
   Beam between torpedo bulkheads 108.27 ft / 33.00 m

   - Hull Bulges:
      0.35" / 9 mm   639.76 ft / 195.00 m   21.33 ft / 6.50 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   19.3" / 490 mm   7.87" / 200 mm      17.7" / 450 mm
   2nd:   3.94" / 100 mm   1.97" / 50 mm      2.95" / 75 mm
   3rd:   0.98" / 25 mm   0.98" / 25 mm      0.98" / 25 mm
   4th:   0.24" / 6 mm   0.24" / 6 mm      0.24" / 6 mm

   - Armoured deck - multiple decks:
   For and Aft decks: 7.87" / 200 mm
   Forecastle: 2.95" / 75 mm  Quarter deck: 5.91" / 150 mm

   - Conning towers: Forward 1.77" / 45 mm, Aft 3.94" / 100 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 71,746 shp / 53,522 Kw = 20.00 kts
   Range 12,000nm at 16.00 kts
   Bunker at max displacement = 17,079 tons

Complement:
   3,366 - 4,376

Cost:
   £36.478 million / $145.914 million

Distribution of weights at normal displacement:
   Armament: 12,443 tons, 9.8 %
      - Guns: 12,443 tons, 9.8 %
   Armour: 43,100 tons, 33.9 %
      - Belts: 9,676 tons, 7.6 %
      - Torpedo bulkhead: 2,675 tons, 2.1 %
      - Bulges: 179 tons, 0.2 %
      - Armament: 10,346 tons, 8.1 %
      - Armour Deck: 19,914 tons, 15.7 %
      - Conning Towers: 311 tons, 0.2 %
   Machinery: 2,265 tons, 1.8 %
   Hull, fittings & equipment: 49,419 tons, 38.9 %
   Fuel, ammunition & stores: 17,331 tons, 13.6 %
   Miscellaneous weights: 2,575 tons, 2.0 %
      - Hull below water: 730 tons
      - Bulge void weights: 200 tons
      - Hull above water: 200 tons
      - On freeboard deck: 200 tons
      - Above deck: 1,245 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     294,678 lbs / 133,664 Kg = 117.3 x 17.1 " / 435 mm shells or 82.1 torpedoes
   Stability (Unstable if below 1.00): 1.48
   Metacentric height 25.1 ft / 7.7 m
   Roll period: 16.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.27
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has low forecastle, rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.700 / 0.703
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 31.37 kts
   Power going to wave formation at top speed: 31 %
   Trim (Max stability = 0, Max steadiness = 100): 59
   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 %,  35.10 ft / 10.70 m,  31.99 ft / 9.75 m
      - Forward deck:   40.00 %,  32.64 ft / 9.95 m,  30.18 ft / 9.20 m
      - Aft deck:   25.00 %,  21.98 ft / 6.70 m,  21.98 ft / 6.70 m
      - Quarter deck:   15.00 %,  21.98 ft / 6.70 m,  21.98 ft / 6.70 m
      - Average freeboard:      28.01 ft / 8.54 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 87.2 %
      - Above water (accommodation/working, high = better): 232.0 %
   Waterplane Area: 147,530 Square feet or 13,706 Square metres
   Displacement factor (Displacement / loading): 120 %
   Structure weight / hull surface area: 313 lbs/sq ft or 1,526 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - 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

Nairyosangha is an angle of fire, speaker of truth.

[Kaiser Kirk]

The 3rd & 4th cruisers of Royal Nisean XII class completes in 1925.5.
6 x T2 180 (power assist), 125mm belt, 50mm deck, 30kt speed,
Traditional overgunned over armored and slightly slow Parthian ships.

First two have been in service long enough to be past trials.
Repeat them in 1926, or go with an alternate?
(reply 218 : https://www.navalism.org/index.php/topic,7658.msg100247/topicseen.html#msg100247)

The Alternate would be the Omaha inspired cruisers posted back for 1923.
With the A/B and X/Y guns backed by the double-stacked casements,
That gives 6 guns fore/aft for chases, and 8 on broadside.
While the Omahas had 6" guns, these have 7" (180mm)
and are much better armored.

The Omaha - H, at 32knots and a 90mm belt set 1.6m above WL to -2.0 below WL
The Omaha - J at 30 knots and a 125mm belt set 3.9m above WL to -2.0 below WL
They exceed 8000nm at 16 knots to allow for aggressive high speed scouting around
the battleline.

Overall, I think laying down more Royal Neissans works, but the Omaha-J has some merit.
I rather like the extensive side armor.

Omaha H
Omaha H 180mm, Parthian Cruiser laid down 1926

Displacement:
   8,002 t light; 8,439 t standard; 9,367 t normal; 10,110 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (553.41 ft / 547.90 ft) x 55.77 ft x (21.85 / 23.14 ft)
   (168.68 m / 167.00 m) x 17.00 m  x (6.66 / 7.05 m)

Armament:
      4 - 7.09" / 180 mm 47.0 cal guns - 198.42lbs / 90.00kg shells, 160 per gun
     Breech loading guns in deck and hoist mounts, 1926 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      8 - 7.09" / 180 mm 47.0 cal guns - 198.42lbs / 90.00kg shells, 160 per gun
     Breech loading guns in casemate mounts, 1926 Model
     8 x Single mounts on side ends, evenly spread
      4 raised mounts
      4 - 3.54" / 90.0 mm 50.0 cal guns - 24.25lbs / 11.00kg shells, 410 per gun
     Anti-air guns in deck and hoist mounts, 1926 Model
     2 x 2-gun mounts on sides amidships
      2 raised mounts
      4 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 800 per gun
     Breech loading guns in deck mounts, 1926 Model
     2 x Twin mounts on centreline ends, evenly spread
      2 double raised mounts
      16 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 5,000 per gun
     Machine guns in deck mounts, 1926 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 2,506 lbs / 1,137 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   5.91" / 150 mm   356.14 ft / 108.55 m   12.07 ft / 3.68 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length
     Main Belt inclined -15.00 degrees (positive = in)

   - Hull void:
      0.00" / 0 mm     0.00 ft / 0.00 m   0.00 ft / 0.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   2.95" / 75 mm   1.77" / 45 mm      1.97" / 50 mm
   2nd:   2.95" / 75 mm   1.77" / 45 mm      1.97" / 50 mm
   3rd:   0.31" / 8 mm         -               -
   4th:   0.31" / 8 mm         -               -
   5th:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 1.77" / 45 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 1.77" / 45 mm

   - Conning towers: Forward 5.91" / 150 mm, Aft 1.77" / 45 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 73,479 shp / 54,816 Kw = 31.00 kts
   Range 8,400nm at 14.00 kts
   Bunker at max displacement = 1,670 tons

Complement:
   475 - 618

Cost:
   £2.651 million / $10.604 million

Distribution of weights at normal displacement:
   Armament: 466 tons, 5.0 %
      - Guns: 466 tons, 5.0 %
   Armour: 1,931 tons, 20.6 %
      - Belts: 1,040 tons, 11.1 %
      - Armament: 164 tons, 1.8 %
      - Armour Deck: 654 tons, 7.0 %
      - Conning Towers: 73 tons, 0.8 %
   Machinery: 2,352 tons, 25.1 %
   Hull, fittings & equipment: 2,877 tons, 30.7 %
   Fuel, ammunition & stores: 1,366 tons, 14.6 %
   Miscellaneous weights: 375 tons, 4.0 %
      - Hull below water: 40 tons
      - Hull void weights: 100 tons
      - Hull above water: 33 tons
      - On freeboard deck: 105 tons
      - Above deck: 97 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     9,485 lbs / 4,302 Kg = 53.3 x 7.1 " / 180 mm shells or 1.4 torpedoes
   Stability (Unstable if below 1.00): 1.07
   Metacentric height 2.4 ft / 0.7 m
   Roll period: 15.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 69 %
         - Recoil effect (Restricted arc if above 1.00): 0.77
   Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
   Hull has raised forecastle, rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.491 / 0.500
   Length to Beam Ratio: 9.82 : 1
   'Natural speed' for length: 23.41 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 62
   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:   20.00 %,  25.92 ft / 7.90 m,  23.46 ft / 7.15 m
      - Forward deck:   35.00 %,  23.43 ft / 7.14 m,  21.33 ft / 6.50 m
      - Aft deck:   30.00 %,  13.45 ft / 4.10 m,  13.45 ft / 4.10 m
      - Quarter deck:   15.00 %,  13.45 ft / 4.10 m,  14.44 ft / 4.40 m
      - Average freeboard:      18.85 ft / 5.74 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 99.6 %
      - Above water (accommodation/working, high = better): 147.8 %
   Waterplane Area: 20,195 Square feet or 1,876 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 92 lbs/sq ft or 451 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.87
      - Longitudinal: 1.51
      - Overall: 0.92
   Caution: Hull subject to strain in open-sea
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room

Modeled on USS Omaha
with above-deck casements for end-on fire
and 180 vs. the US 6"

The belt is facehardened 150mm, outsloped 15 degrees
and capped by the armor deck.

3.6m/cos(12) = 3.6804= 3.68m


47t -  Fire Control
25t - LR Radio
25t - Searchlight tower (NF)

18t - 2TT3 21" 3t
25+5 - Fighter Float + Gunpwdr CAT
57t - 10% rotating wt Power Assist for 180L47

8t - CO2 Compresser A/C
25t - Enhanced Fire Ext.

15t - Enhanced Hydrophones
25t - Extra Pumps.


Decks
+6.4  Forecastle deck
+4.1  Weather deck
+1.6  Top belt, Armored Deck
-0.9
         -2.0  Bottom main belt
-3.4 
-6.4   Engineering   
-6.66  Keel

Omaha J 180mm, Parthian Cruiser laid down 1926

Displacement:
   8,000 t light; 8,445 t standard; 9,715 t normal; 10,731 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (520.53 ft / 515.09 ft) x 55.77 ft x (24.61 / 26.50 ft)
   (158.66 m / 157.00 m) x 17.00 m  x (7.50 / 8.08 m)

Armament:
      4 - 7.09" / 180 mm 47.0 cal guns - 198.42lbs / 90.00kg shells, 160 per gun
     Breech loading guns in deck and hoist mounts, 1926 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      8 - 7.09" / 180 mm 47.0 cal guns - 198.42lbs / 90.00kg shells, 160 per gun
     Breech loading guns in casemate mounts, 1926 Model
     8 x Single mounts on side ends, evenly spread
      4 raised mounts
      4 - 3.54" / 90.0 mm 50.0 cal guns - 24.25lbs / 11.00kg shells, 410 per gun
     Anti-air guns in deck and hoist mounts, 1926 Model
     2 x 2-gun mounts on sides amidships
      2 raised mounts
      4 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 800 per gun
     Breech loading guns in deck mounts, 1926 Model
     2 x Twin mounts on centreline ends, evenly spread
      2 double raised mounts
      16 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 5,000 per gun
     Machine guns in deck mounts, 1926 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 2,506 lbs / 1,137 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.92" / 125 mm   334.81 ft / 102.05 m   19.78 ft / 6.03 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length
     Main Belt inclined -12.00 degrees (positive = in)

   - Hull void:
      0.00" / 0 mm     0.00 ft / 0.00 m   0.00 ft / 0.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   2.95" / 75 mm   1.77" / 45 mm      1.97" / 50 mm
   2nd:   2.95" / 75 mm   1.77" / 45 mm      1.97" / 50 mm
   3rd:   0.31" / 8 mm         -               -
   4th:   0.31" / 8 mm         -               -
   5th:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 1.77" / 45 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 1.77" / 45 mm

   - Conning towers: Forward 5.91" / 150 mm, Aft 1.77" / 45 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 67,942 shp / 50,684 Kw = 30.00 kts
   Range 8,374nm at 16.00 kts
   Bunker at max displacement = 2,286 tons

Complement:
   489 - 636

Cost:
   £2.565 million / $10.260 million

Distribution of weights at normal displacement:
   Armament: 466 tons, 4.8 %
      - Guns: 466 tons, 4.8 %
   Armour: 2,190 tons, 22.5 %
      - Belts: 1,342 tons, 13.8 %
      - Armament: 164 tons, 1.7 %
      - Armour Deck: 609 tons, 6.3 %
      - Conning Towers: 75 tons, 0.8 %
   Machinery: 2,175 tons, 22.4 %
   Hull, fittings & equipment: 2,744 tons, 28.2 %
   Fuel, ammunition & stores: 1,715 tons, 17.6 %
   Miscellaneous weights: 425 tons, 4.4 %
      - Hull below water: 40 tons
      - Hull void weights: 125 tons
      - Hull above water: 33 tons
      - On freeboard deck: 105 tons
      - Above deck: 122 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     10,303 lbs / 4,673 Kg = 57.9 x 7.1 " / 180 mm shells or 1.6 torpedoes
   Stability (Unstable if below 1.00): 1.07
   Metacentric height 2.4 ft / 0.7 m
   Roll period: 15.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.80
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.481 / 0.493
   Length to Beam Ratio: 9.24 : 1
   'Natural speed' for length: 22.70 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 59
   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:   20.00 %,  25.59 ft / 7.80 m,  23.29 ft / 7.10 m
      - Forward deck:   45.00 %,  23.29 ft / 7.10 m,  20.67 ft / 6.30 m
      - Aft deck:   20.00 %,  12.80 ft / 3.90 m,  12.80 ft / 3.90 m
      - Quarter deck:   15.00 %,  12.80 ft / 3.90 m,  13.78 ft / 4.20 m
      - Average freeboard:      19.29 ft / 5.88 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 90.3 %
      - Above water (accommodation/working, high = better): 140.4 %
   Waterplane Area: 18,817 Square feet or 1,748 Square metres
   Displacement factor (Displacement / loading): 115 %
   Structure weight / hull surface area: 91 lbs/sq ft or 442 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.83
      - Longitudinal: 1.88
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

Modeled on USS Omaha
with above-deck casements for end-on fire
and 180 vs. the US 6"

The "J" varient is 1 knot slower than the "I",
using that to raise the armor belt 1 deck level, to the weather deck level,
and carry the forecastle deck further aft for better seakeeping.


The belt is facehardened 125mm, outsloped 12 degrees
and capped by the armor deck. This carries to the -2.0m level to guard against diving shells, as well as wave period exposing the belt.

5.9m/cos(12) = 6.0318= 6.03m

This makes a much larger area of hull well protected, and vastly increases the floatation.

125t Wt reserve

47t -  Fire Control
25t - LR Radio
25t - Searchlight tower (NF)
25t - Hulesmeyere station keeping device

18t - 2TT3 21" 3t
25+5 - Fighter Float + Gunpwdr CAT
57t - 10% rotating wt Power Assist for 180L47

8t - CO2 Compresser A/C
25t - Enhanced Fire Ext.

15t - Enhanced Hydrophones
10t- Sonar
25t - Extra Pumps.


Decks
+6.3     Forecastle deck
+3.9     Weather deck, Armored Deck, top of Belt.
+1.4     3rd Deck
-1.1      2nd deck
         -2.0  Bottom main belt
-3.6      1st deck
-5.95    Engineering   (pierces 1st deck)
-6.45    Double Bottom
-7.5   Keel

[TacCovert4]

I think it's a no Brainer.   12 guns for a 12 gun broadside is substantially better than 12 guns for an 8 gun broadside.   And the 32kts is nice, but as your principal possible opposition runs slower ships, you have no need.

[Kaiser Kirk]

That's generally where I was coming down.

The Single vs. Two-gun does ameliorate some of the firepower difference.

The Royal Niseans have 4 forward at 90% = 3.6, and 12 broadside at 90%= 10.8.
So 60% of the fore/aft throwweight, and 35% more broadside throwweight.

The broader belt of the Omaha-J is NICE....but likely doesn't offset the barrel differential.

So the real question is if the extra speed and end-on fire of the Omaha-H brings anything special to the table.

The Omaha-H, with the 90mm inclined belt, seems marginally armored, but the deck is good.

The 'Chase' bit comes in here, with the 6 singles bearing forward and high speed and high fuel, they can run down slower ships.
The 32knot speed both means they can work around the four Zemaka 8x255mm, 200mmB/65mm deck, 31kts ACs
but also can try to keep the range open vs. other cruisers, offsetting the belt difference.