Parthian vessels 1916 onwards

[Kaiser Kirk]

The various Byzantine designs of Panzerschiffs - either vessels armed with old guns, or the various new designs, have long been source of some consternation for Parthia.

Generally, they expect their rebuilt Pre-dreads and Armored cruisers will have to match up. That is one reason the Asdar class was rearmed with the newer 255L47, which is more powerful than the old 255L50 due to tech difference.  While the Asdar and Zemaka classes give me 8 ships with 8x255L47, and I may build more.

But the 4 older ACs and the 6 old Predreads will eventually wear out.

So..build more Zemakas.. or build some sort of Panzerschiff of my own.

So I explored the latter.
I have a range of 24-26knt ships with 8x230L44 / 6x255L47 / 6x300L41  and armor from 180-230 on the belt.
They range in tonnage from 9800 (8x230, 24kts) to 14000 (this)

Comparatively, the Haminka class ACs would be 18500-19500, 8x255L47, 31kts, 180-230mm belt.

Collectively, replacing the 4 old ACs and 6 PDs...that 5BP difference adds up.
But I do think the ACs are still competitive and more flexible.
Maybe some of each.

Polawad Manbad, Parthia Coast Defense Cruiser laid down 1927

Displacement:
   14,000 t light; 14,830 t standard; 15,907 t normal; 16,769 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (488.85 ft / 482.28 ft) x 72.18 ft x (24.61 / 25.74 ft)
   (149.00 m / 147.00 m) x 22.00 m  x (7.50 / 7.84 m)

Armament:
      6 - 10.04" / 255 mm 47.0 cal guns - 606.27lbs / 275.00kg shells, 160 per gun
     Breech loading guns in turret on barbette mounts, 1927 Model
     2 x 3-gun mounts on centreline ends, evenly spread
      12 - 5.12" / 130 mm 50.0 cal guns - 70.55lbs / 32.00kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1927 Model
     2 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     4 x 2-gun mounts on side ends, evenly spread
      8 - 3.54" / 90.0 mm 50.0 cal guns - 24.25lbs / 11.00kg shells, 400 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on side ends, evenly spread
      4 raised mounts
      12 - 2.24" / 57.0 mm 60.0 cal guns - 6.19lbs / 2.81kg shells, 600 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on side ends, evenly spread
      4 raised mounts
     2 x 2-gun 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, 3,000 per gun
     Machine guns in deck mounts, 1927 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 4,754 lbs / 2,157 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   9.06" / 230 mm   308.66 ft / 94.08 m   14.44 ft / 4.40 m
   Ends:   1.57" / 40 mm   173.59 ft / 52.91 m   14.44 ft / 4.40 m
   Upper:   1.97" / 50 mm   308.66 ft / 94.08 m   13.98 ft / 4.26 m
     Main Belt covers 98 % of normal length
     Main Belt inclined -12.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.50" / 38 mm   308.66 ft / 94.08 m   30.18 ft / 9.20 m
   Beam between torpedo bulkheads 49.21 ft / 15.00 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:   10.0" / 255 mm   5.12" / 130 mm      8.66" / 220 mm
   2nd:   2.95" / 75 mm   1.57" / 40 mm      1.97" / 50 mm
   3rd:   1.57" / 40 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 - single deck:
   For and Aft decks: 4.49" / 114 mm
   Forecastle: 1.57" / 40 mm  Quarter deck: 2.95" / 75 mm

   - Conning towers: Forward 10.04" / 255 mm, Aft 1.57" / 40 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 59,981 shp / 44,746 Kw = 26.00 kts
   Range 6,960nm at 14.00 kts
   Bunker at max displacement = 1,939 tons

Complement:
   707 - 920

Cost:
   £4.310 million / $17.238 million

Distribution of weights at normal displacement:
   Armament: 1,102 tons, 6.9 %
      - Guns: 1,102 tons, 6.9 %
   Armour: 5,743 tons, 36.1 %
      - Belts: 2,286 tons, 14.4 %
      - Torpedo bulkhead: 516 tons, 3.2 %
      - Armament: 761 tons, 4.8 %
      - Armour Deck: 2,022 tons, 12.7 %
      - Conning Towers: 158 tons, 1.0 %
   Machinery: 1,893 tons, 11.9 %
   Hull, fittings & equipment: 4,692 tons, 29.5 %
   Fuel, ammunition & stores: 1,907 tons, 12.0 %
   Miscellaneous weights: 570 tons, 3.6 %
      - Hull below water: 181 tons
      - Hull void weights: 100 tons
      - Hull above water: 28 tons
      - On freeboard deck: 65 tons
      - Above deck: 196 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     25,905 lbs / 11,750 Kg = 51.2 x 10.0 " / 255 mm shells or 4.3 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 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.62
   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): 0.650 / 0.655
   Length to Beam Ratio: 6.68 : 1
   'Natural speed' for length: 21.96 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 12.00 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 %,  24.28 ft / 7.40 m,  23.95 ft / 7.30 m
      - Forward deck:   44.00 %,  23.95 ft / 7.30 m,  23.95 ft / 7.30 m
      - Aft deck:   20.00 %,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Quarter deck:   16.00 %,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Average freeboard:      21.02 ft / 6.41 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 98.0 %
      - Above water (accommodation/working, high = better): 153.7 %
   Waterplane Area: 26,667 Square feet or 2,477 Square metres
   Displacement factor (Displacement / loading): 112 %
   Structure weight / hull surface area: 132 lbs/sq ft or 644 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.10
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room

'Polawad Mandbad' = Steel Watchdog

A design exploration of a vessel able to be a covoy guard, amphibious bombardment vessel, coastal escort (7.5m draft), able keep up with the Stormbringer class (26kts), wiith at least 3 gun volleys, using the mid-range guns 230/255/300.  The end result needs to be competitive with the various ACs and cruisers out there, demanding a capital ship to defeat, but faster than the Byzantine line.  This translates to a thick belt and heavy deck as it will be unable to choose the engagement range in most cases.

Armor Belt
Upper Belt is 50mm and covers from main belt to weather deck, and forecastle deck forward, and is capped by the upper armor deck.

This means it is 5m high for 44/64 = 68.75% (5*.6875)= 3.4375m
and 2.5m for 31.25% = (2.5*.3125) = 0.78125m
=4.25625m = 4.26m high

The main armor belt covers from -2m to 2.3m, the upper belt covers to freeboard.

Armor belt is outsloped 12 degrees
4.3/cos(12) = 4.396=4.40

Armor decks
The upper armor deck is 35mm
The main armor deck is 75mm
bow is 40mm and stern is 75mm
This weights 1959

There is a 40mm box around the magazines weighing 61tons
That brings the total weight to 2020

This is accounted for in the fore & aft deck being xx instead of 110 (35+75)
Final weight is 2022.

TDS
TDS rises to seal to the bottom of the Main Armor Deck at +2m above WL,
serving as a splinter barrier behind the main belt.


Decks
+7.3  Weather Deck,  35mm
+4.8  Battery  Deck, 35mm
+2.3  Armor Deck, Top Armor Belt, Top TDS
-00.20 2nd
     -2.0 Bottom Armor Belt
-02.70 1st
-06.20 Engineering
-07.20 Double Bottom
-07.50  Keel


Misc wt
100t Reserve

AD
111t Fire Control
25t LR Radio
25t Searchlight Tower (NF)
25t Hulesmeyer proximity detector
10t Dedicated Air-barnd SR radio

OD
5t Paravanes
40t 2x Scout Floatplanes
10t 2x gunpowder cat
10t 2-plane hanger

HAW
14t - Add Fire Ext
14t - CO2 compressor AC

HBW
14t - extra pumps
15t - Double wall tank (5t) + (10t)  AVGAS & supplies
5t - Fire ext for Avgas.
147t - torpedo nets

[Kaiser Kirk]

Then this is a slightly smaller iteration of the vessel, with a lower top speed, much weaker armor,
but the 300L41 guns. These, with the 1910 caps, could penetrate 215mm at 14km, and would have better plunging fire at range than the 255L47.

Its only a 1500 ton difference, as it's still a pretty redoubtable vessel.

Polawad Manbad, Parthia Coast Defense Cruiser laid down 1927

Displacement:
   12,500 t light; 13,425 t standard; 14,345 t normal; 15,080 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (452.76 ft / 446.19 ft) x 75.46 ft x (24.61 / 25.65 ft)
   (138.00 m / 136.00 m) x 23.00 m  x (7.50 / 7.82 m)

Armament:
      6 - 11.81" / 300 mm 41.5 cal guns - 870.83lbs / 395.00kg shells, 155 per gun
     Breech loading guns in turret on barbette mounts, 1927 Model
     2 x 3-gun mounts on centreline ends, evenly spread
      12 - 5.12" / 130 mm 50.0 cal guns - 70.55lbs / 32.00kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1927 Model
     2 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     4 x 2-gun mounts on side ends, evenly spread
      8 - 3.54" / 90.0 mm 50.0 cal guns - 24.25lbs / 11.00kg shells, 400 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on side ends, evenly spread
      4 raised mounts
      12 - 2.24" / 57.0 mm 60.0 cal guns - 6.19lbs / 2.81kg shells, 600 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on side ends, evenly spread
      4 raised mounts
     2 x 2-gun 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, 3,000 per gun
     Machine guns in deck mounts, 1927 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 6,342 lbs / 2,877 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   8.27" / 210 mm   290.03 ft / 88.40 m   14.44 ft / 4.40 m
   Ends:   1.38" / 35 mm   156.14 ft / 47.59 m   14.44 ft / 4.40 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -12.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.93" / 49 mm   290.03 ft / 88.40 m   29.82 ft / 9.09 m
   Beam between torpedo bulkheads 52.49 ft / 16.00 m

   - Hull void:
      0.00" / 0 mm   290.03 ft / 88.40 m   0.00 ft / 0.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   10.0" / 255 mm   5.12" / 130 mm      8.27" / 210 mm
   2nd:   2.95" / 75 mm   1.57" / 40 mm      1.97" / 50 mm
   3rd:   1.57" / 40 mm   0.98" / 25 mm      0.98" / 25 mm
   4th:   0.98" / 25 mm   0.31" / 8 mm      0.31" / 8 mm
   5th:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.56" / 65 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 2.56" / 65 mm

   - Conning towers: Forward 9.06" / 230 mm, Aft 1.57" / 40 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 41,908 shp / 31,263 Kw = 24.00 kts
   Range 6,276nm at 14.00 kts
   Bunker at max displacement = 1,655 tons

Complement:
   654 - 851

Cost:
   £4.203 million / $16.811 million

Distribution of weights at normal displacement:
   Armament: 1,313 tons, 9.2 %
      - Guns: 1,313 tons, 9.2 %
   Armour: 4,415 tons, 30.8 %
      - Belts: 1,644 tons, 11.5 %
      - Torpedo bulkhead: 617 tons, 4.3 %
      - Armament: 885 tons, 6.2 %
      - Armour Deck: 1,134 tons, 7.9 %
      - Conning Towers: 135 tons, 0.9 %
   Machinery: 1,323 tons, 9.2 %
   Hull, fittings & equipment: 4,842 tons, 33.8 %
   Fuel, ammunition & stores: 1,845 tons, 12.9 %
   Miscellaneous weights: 607 tons, 4.2 %
      - Hull below water: 180 tons
      - Hull void weights: 180 tons
      - Hull above water: 26 tons
      - On freeboard deck: 50 tons
      - Above deck: 171 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     23,068 lbs / 10,464 Kg = 28.0 x 11.8 " / 300 mm shells or 4.3 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 4.0 ft / 1.2 m
   Roll period: 15.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.91
   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): 0.606 / 0.611
   Length to Beam Ratio: 5.91 : 1
   'Natural speed' for length: 21.12 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 59
   Bow angle (Positive = bow angles forward): 12.00 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 %,  25.92 ft / 7.90 m,  24.93 ft / 7.60 m
      - Forward deck:   45.00 %,  24.93 ft / 7.60 m,  23.95 ft / 7.30 m
      - Aft deck:   20.00 %,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Quarter deck:   15.00 %,  15.75 ft / 4.80 m,  17.39 ft / 5.30 m
      - Average freeboard:      21.70 ft / 6.61 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 97.7 %
      - Above water (accommodation/working, high = better): 157.0 %
   Waterplane Area: 24,764 Square feet or 2,301 Square metres
   Displacement factor (Displacement / loading): 113 %
   Structure weight / hull surface area: 149 lbs/sq ft or 726 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.89
      - Longitudinal: 2.82
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

"Polawad  Manban    " - Steel Watchdog

Meant as a coastal defense/convoy escort/amphious bombardment vessel.

Faster than known Byzantine battleships, still vunerable to various battlecruisers, but very very dangerous to anything less. 

Armor Belt
Upper Belt is 50mm and covers from main belt to weather deck, and is capped by the upper armor deck.

The main armor belt covers from -2m to 2.3m, the upper belt covers to freeboard.

Armor belt is outsloped 12 degrees
4.3/cos(12) = 4.396=4.40

Armor decks
The upper armor deck is 35mm
The main armor deck is 75mm

TDS
TDS rises to seal to the bottom of the Main Armor Deck at +2m above WL, serving as a splinter barrier behind the main belt.

Depth is 3.5each side, with two compartments, an outer 1.25m void backed by a 19mm STS bulkhead, then a 2.m liquid (oil) filled compartment backed by a 30mm armored holding bulkhead.

The outervoid decouples the shock wave, and allows for counterflooding. The 19mm bulkhead deforms, not tears, dispersing the shock into the fuel oil over a broad area, allowing the 30mm builkead to absorb it over a wide area.  The 2m deep fuel oil also slows or stops splinters, keeping the 30mm bulkhead from being perforated.

Misc Wt
200t  - Reserve

AD
111t  FC
25t    Long Range Radio
25t    Searchlight Tower (NF)
10t   Dedicated Air Comm SR Radio

OD
5t  - Paravanes
40t- 2x Scout Floatplanes
5t - Gunpowder Catapult

HAW
13t  - CO2 AC compressor
13t - Enhanced Fire Suppression

HBW
147t  - Torpedo Nets
13t -  Enhanced Pumps
15t - Double wall tanks & AVGAS
5t - Fire suppression for AVGAS.


Decks
+7.3    Weather Deck
+4.8    Battery  Deck
+2.3    Armor Deck, Top Armor Belt, Top TDS
-00.20  2nd
    -2.0  Bottom Armor Belt
-02.70  1st
-06.20  Engineering
-06.96  Double Bottom

[Jefgte]

...But the 4 older ACs and the 6 old Predreads will eventually wear out...

Byzantium will replace these old hulls (PDNs) around 1930 with Panzerschiffs. I haven't done any SS yet.
All combinations are possible:
- 24 to 27kts
- 8000 to 15000t
- 230mm is light, 343 is heavy.
- 254mm seems a good compromise.
- A formidable opponent for cruisers and good support for 20-21kts BBs.

[Kaiser Kirk]

I'm rather partial to my 255L47 as well, so that may be a winner.

In other news...I am bad at designing yachts.
I want it to be able to safely move the Royal Family quickly around the globe, at high speeds, in luxury.
There is a concern regarding interception by other nations or even pirates. So it is a powerful enough cruiser to beat the old light cruisers of the world. The armored deck is thick and VIPs can shelter below.
The cruise speed and TDS make submarines a very very limited threat.

...but it is very expensive.

Goldplated Elephant, Parthia Royal Armored Yacht laid down 1927

Displacement:
   16,500 t light; 17,215 t standard; 21,151 t normal; 24,300 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (524.93 ft / 518.37 ft) x 88.58 ft (Bulges 95.14 ft) x (24.61 / 27.86 ft)
   (160.00 m / 158.00 m) x 27.00 m (Bulges 29.00 m)  x (7.50 / 8.49 m)

Armament:
      8 - 7.09" / 180 mm 47.0 cal guns - 187.39lbs / 85.00kg shells, 155 per gun
     Breech loading guns in turret on barbette mounts, 1927 Model
     2 x 4-gun mounts on centreline, forward evenly spread
      1 raised mount
      12 - 4.72" / 120 mm 43.0 cal guns - 55.12lbs / 25.00kg shells, 252 per gun
     Quick firing guns in deck and hoist mounts, 1927 Model
     6 x 2-gun mounts on sides, evenly spread
      8 - 3.54" / 90.0 mm 50.0 cal guns - 24.25lbs / 11.00kg shells, 400 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on sides, forward evenly spread
      4 raised mounts
      12 - 2.24" / 57.0 mm 60.0 cal guns - 6.19lbs / 2.81kg shells, 600 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     6 x 2-gun mounts on sides, forward evenly spread
      6 raised mounts
      16 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 3,000 per gun
     Machine guns in deck mounts, 1927 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 2,431 lbs / 1,103 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.72" / 120 mm   336.94 ft / 102.70 m   14.11 ft / 4.30 m
   Ends:   1.57" / 40 mm   181.40 ft / 55.29 m   14.11 ft / 4.30 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.93" / 49 mm   336.94 ft / 102.70 m   30.45 ft / 9.28 m
   Beam between torpedo bulkheads 59.06 ft / 18.00 m

   - Hull Bulges:
      0.35" / 9 mm   336.94 ft / 102.70 m   18.04 ft / 5.50 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   6.50" / 165 mm   2.95" / 75 mm      5.12" / 130 mm
   2nd:   1.97" / 50 mm   1.57" / 40 mm      1.57" / 40 mm
   3rd:   1.57" / 40 mm   0.98" / 25 mm      0.98" / 25 mm
   4th:   0.98" / 25 mm   0.31" / 8 mm      0.31" / 8 mm
   5th:   0.31" / 8 mm         -               -

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

   - Conning towers: Forward 5.91" / 150 mm, Aft 1.57" / 40 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 96,705 shp / 72,142 Kw = 28.00 kts
   Range 6,644nm at 22.00 kts
   Bunker at max displacement = 7,085 tons

Complement:
   876 - 1,140

Cost:
   £4.503 million / $18.013 million

Distribution of weights at normal displacement:
   Armament: 688 tons, 3.3 %
      - Guns: 688 tons, 3.3 %
   Armour: 4,046 tons, 19.1 %
      - Belts: 1,146 tons, 5.4 %
      - Torpedo bulkhead: 732 tons, 3.5 %
      - Bulges: 80 tons, 0.4 %
      - Armament: 515 tons, 2.4 %
      - Armour Deck: 1,449 tons, 6.9 %
      - Conning Towers: 123 tons, 0.6 %
   Machinery: 3,053 tons, 14.4 %
   Hull, fittings & equipment: 7,346 tons, 34.7 %
   Fuel, ammunition & stores: 4,652 tons, 22.0 %
   Miscellaneous weights: 1,368 tons, 6.5 %
      - Hull below water: 338 tons
      - Bulge void weights: 50 tons
      - Hull above water: 836 tons
      - On freeboard deck: 50 tons
      - Above deck: 94 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     52,953 lbs / 24,019 Kg = 297.6 x 7.1 " / 180 mm shells or 8.4 torpedoes
   Stability (Unstable if below 1.00): 1.47
   Metacentric height 8.0 ft / 2.5 m
   Roll period: 14.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.21
   Seaboat quality  (Average = 1.00): 1.58

Hull form characteristics:
   Hull has rise aft of midbreak, low quarterdeck ,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.610 / 0.619
   Length to Beam Ratio: 5.45 : 1
   'Natural speed' for length: 22.77 kts
   Power going to wave formation at top speed: 64 %
   Trim (Max stability = 0, Max steadiness = 100): 44
   Bow angle (Positive = bow angles forward): 12.00 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 %,  28.87 ft / 8.80 m,  28.87 ft / 8.80 m
      - Forward deck:   35.00 %,  28.87 ft / 8.80 m,  28.87 ft / 8.80 m
      - Aft deck:   30.00 %,  45.28 ft / 13.80 m,  45.28 ft / 13.80 m
      - Quarter deck:   15.00 %,  28.87 ft / 8.80 m,  28.87 ft / 8.80 m
      - Average freeboard:      33.79 ft / 10.30 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 96.8 %
      - Above water (accommodation/working, high = better): 268.6 %
   Waterplane Area: 33,899 Square feet or 3,149 Square metres
   Displacement factor (Displacement / loading): 154 %
   Structure weight / hull surface area: 138 lbs/sq ft or 674 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.88
      - Longitudinal: 4.28
      - Overall: 1.03
   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

Designed as Armored Royal Yacht,
it is meant to be well armored against hand loaded weapons, and torpedo protection is provided.

The freeboard has been raise to provide copious room below  decks, and the main guns are concentrated forward, while the aft superstructure is raised, much like a hanger, giving sheltered spaces below, and a large flat deck above.

A high sustained cruising speed will mean the vessel can quickly move between ports. The speed has the secondary effect of being higher than a submarine can intercept, and the fuel load means she can sustain top speed for long periods (3163@28kts).



Misc Wt
200t  - Reserve

AD
69t  FC
25t    Long Range Radio


OD
5t  - Paravanes
40t- 2x Scout Floatplanes
5t - Gunpowder Catapult

HAW
800t - VIP Staterooms and luxury areas (Ballrooms, etc).
18t  - CO2 AC compressor
18t - Enhanced Fire Suppression

HBW
300t - Luxury Staff & Supplies
18t -  Enhanced Pumps
15t - Double wall tanks & AVGAS
5t - Fire suppression for AVGAS.

[Kaiser Kirk]

Cruiser I'm considering.

The Royal Nissean class has a powerful battery, but
it's 10m longer than most of my 'Cruiser' docks, and I'd like to boost cruiser speeds to 31 knots.
Plus, I'd like my scout/ skirmish line to cruise at a higher average speed around the battleline, at 16knots +,
AND  I'd like slightly better armor.

So I need a shorter, faster, more heavily armored ship on the same tonnage.
That 'costs' the 120mm secondary battery.... the lack of which could bite me in shorter ranged and night time battles,
but the two-gun 180s w/ power assist should rotate and operate fast enough to be fine in the expected engagement ranges.

However, there is quite a loss between 12x 180 + 120s vs. 8x 180...though fore/aft fire is the same.

I like the armor improvements, but I'm not sold the additional knot is worth loosing the secondary and extra main battery,
though a more compact ship is rather important as I don't want to have to extend a bunch of docks.

I've got a version with the old 10 single 180s as well, which gives 6 fore/7 beam / 4 aft, making a better 'hunter',
and the singles fire and rotate even faster.

Wild Horses, Parthian Cruiser laid down 1927

Displacement:
   8,000 t light; 8,432 t standard; 9,653 t normal; 10,629 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (520.60 ft / 515.09 ft) x 60.70 ft x (23.79 / 25.49 ft)
   (158.68 m / 157.00 m) x 18.50 m  x (7.25 / 7.77 m)

Armament:
      8 - 7.09" / 180 mm 47.0 cal guns - 187.39lbs / 85.00kg shells, 200 per gun
     Breech loading guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      8 - 3.54" / 90.0 mm 54.0 cal guns - 24.25lbs / 11.00kg shells, 400 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on side ends, evenly spread
      8 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 800 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     2 x 2-gun mounts on sides amidships
      2 raised mounts
     2 x 2-gun mounts on centreline, evenly spread
      2 double raised mounts
      16 - 0.59" / 15.0 mm 70.0 cal guns - 0.12lbs / 0.05kg shells, 5,000 per gun
     Machine guns in deck mounts, 1927 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 1,748 lbs / 793 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.92" / 125 mm   339.96 ft / 103.62 m   11.55 ft / 3.52 m
   Ends:   Unarmoured
     Main Belt covers 102 % 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   1.57" / 40 mm      1.97" / 50 mm
   3rd:   0.98" / 25 mm   0.98" / 25 mm      0.98" / 25 mm
   4th:   0.31" / 8 mm   0.31" / 8 mm      0.31" / 8 mm
   5th:   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 5.31" / 135 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 77,179 shp / 57,575 Kw = 31.00 kts
   Range 8,190nm at 16.00 kts
   Bunker at max displacement = 2,197 tons

Complement:
   486 - 632

Cost:
   £2.897 million / $11.588 million

Distribution of weights at normal displacement:
   Armament: 493 tons, 5.1 %
      - Guns: 493 tons, 5.1 %
   Armour: 1,747 tons, 18.1 %
      - Belts: 801 tons, 8.3 %
      - Armament: 112 tons, 1.2 %
      - Armour Deck: 782 tons, 8.1 %
      - Conning Tower: 52 tons, 0.5 %
   Machinery: 2,436 tons, 25.2 %
   Hull, fittings & equipment: 3,009 tons, 31.2 %
   Fuel, ammunition & stores: 1,652 tons, 17.1 %
   Miscellaneous weights: 315 tons, 3.3 %
      - Hull below water: 23 tons
      - Hull void weights: 32 tons
      - Hull above water: 16 tons
      - On freeboard deck: 109 tons
      - Above deck: 135 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     10,119 lbs / 4,590 Kg = 56.9 x 7.1 " / 180 mm shells or 1.5 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 2.8 ft / 0.9 m
   Roll period: 15.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.60
   Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.454 / 0.467
   Length to Beam Ratio: 8.49 : 1
   'Natural speed' for length: 22.70 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   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:   42.00 %,  23.46 ft / 7.15 m,  24.28 ft / 7.40 m
      - Aft deck:   24.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Quarter deck:   14.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Average freeboard:      21.15 ft / 6.45 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 100.5 %
      - Above water (accommodation/working, high = better): 165.9 %
   Waterplane Area: 20,013 Square feet or 1,859 Square metres
   Displacement factor (Displacement / loading): 112 %
   Structure weight / hull surface area: 95 lbs/sq ft or 463 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.81
      - Longitudinal: 2.11
      - 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
   Good seaboat, rides out heavy weather easily
                   
                   
                  1                        7
                   (d)                  (s)
A (B) [c]                                       [w] (X) (Y)
                   (e)                 (s)
                  2                         8
                   
                 
The belt is facehardened 125mm, outsloped 15 degrees
and capped by the armor deck at +1.7m
The belt descends to -1.7m below water, for a total height of 3.4m.

3.4m/cos(15) = 3.519 = 3.52m



The Parthians expect floatplanes to taxi up to the fantail, so aircraft handling facilities are placed on the stern.


40t - Reserve

AD
50t -  Fire Control
25t - LR Radio
25t - Searchlight tower (NF)
25t - Hulesmeyer Station Keeping
10t - ATC SR Radio

OD
5t Paravanes
18t - 2TT3 21" 3t
2x 20+5 - Scout  Float + Gunpwdr CAT
41t - PA main battery


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

HBW
15t - Enhanced Hydrophones
8t - Extra Pumps.


Decks
+6.7  Forecastle Deck
+4.2  Weather Deck
+1.7   Battery Deck Top belt, Armored Deck
-0.80    Deck
         -1.7   Bottom main belt
-3.30 
-5.80   Engineering
-6.7  Keel, double bottom

[Kaiser Kirk]

So the comparison is the current Royal Nissean hull modified to meet the same parameters.
This shrinks the length overall, outslopes the belt a bit more, and thickens the deck armor,
so any long range cruiser fire should bounce.
The cruise speed is raised, but the top speed is held to 30knots.
The shorter hull cost seakeeping, so a longer forecastle deck compensates.

Much as I'd like a slightly faster ship, I'm inclined to go with this one.
The offensive power is just much better.

Royal Nssean XIV, Parthian Cruiser laid down 1927

Displacement:
   8,000 t light; 8,563 t standard; 9,802 t normal; 10,794 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (523.95 ft / 518.37 ft) x 57.94 ft x (22.64 / 24.36 ft)
   (159.70 m / 158.00 m) x 17.66 m  x (6.90 / 7.43 m)

Armament:
      12 - 7.09" / 180 mm 47.0 cal guns - 187.39lbs / 85.00kg shells, 180 per gun
     Breech loading guns in deck and hoist mounts, 1927 Model
     6 x 2-gun mounts on centreline, evenly spread
      3 raised mounts
      12 - 4.72" / 120 mm 43.0 cal guns - 55.12lbs / 25.00kg shells, 160 per gun
     Quick firing guns in casemate mounts, 1927 Model
     12 x Single mounts on side ends, evenly spread
      12 hull mounts in casemates- Limited use in heavy seas
      8 - 3.54" / 90.0 mm 50.0 cal guns - 24.25lbs / 11.00kg shells, 400 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on side ends, evenly spread
      12 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 800 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on side ends, evenly spread
      4 raised mounts
     2 x 2-gun mounts on sides forward
      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, 1927 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 3,185 lbs / 1,445 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.92" / 125 mm   347.31 ft / 105.86 m   10.53 ft / 3.21 m
   Ends:   Unarmoured
     Main Belt covers 103 % 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:   5.91" / 150 mm   1.97" / 50 mm      5.12" / 130 mm
   2nd:   0.98" / 25 mm   0.98" / 25 mm      0.98" / 25 mm
   3rd:   0.59" / 15 mm         -               -
   4th:   0.31" / 8 mm   0.31" / 8 mm      0.31" / 8 mm
   5th:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.17" / 55 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 2.17" / 55 mm

   - Conning towers: Forward 5.12" / 130 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 69,075 shp / 51,530 Kw = 30.00 kts
   Range 8,220nm at 16.00 kts
   Bunker at max displacement = 2,231 tons

Complement:
   492 - 640

Cost:
   £3.139 million / $12.557 million

Distribution of weights at normal displacement:
   Armament: 804 tons, 8.2 %
      - Guns: 804 tons, 8.2 %
   Armour: 1,790 tons, 18.3 %
      - Belts: 743 tons, 7.6 %
      - Armament: 224 tons, 2.3 %
      - Armour Deck: 772 tons, 7.9 %
      - Conning Tower: 51 tons, 0.5 %
   Machinery: 2,180 tons, 22.2 %
   Hull, fittings & equipment: 2,797 tons, 28.5 %
   Fuel, ammunition & stores: 1,802 tons, 18.4 %
   Miscellaneous weights: 429 tons, 4.4 %
      - Hull below water: 43 tons
      - Hull void weights: 50 tons
      - Hull above water: 16 tons
      - On freeboard deck: 154 tons
      - Above deck: 166 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     9,322 lbs / 4,228 Kg = 52.4 x 7.1 " / 180 mm shells or 1.4 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 2.7 ft / 0.8 m
   Roll period: 14.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.83
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.505 / 0.516
   Length to Beam Ratio: 8.95 : 1
   'Natural speed' for length: 22.77 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   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 %,  26.25 ft / 8.00 m,  23.79 ft / 7.25 m
      - Forward deck:   32.00 %,  23.79 ft / 7.25 m,  21.33 ft / 6.50 m
      - Aft deck:   35.00 %,  13.45 ft / 4.10 m,  13.45 ft / 4.10 m
      - Quarter deck:   13.00 %,  13.45 ft / 4.10 m,  13.45 ft / 4.10 m
      - Average freeboard:      18.63 ft / 5.68 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 100.7 %
      - Above water (accommodation/working, high = better): 138.5 %
   Waterplane Area: 20,095 Square feet or 1,867 Square metres
   Displacement factor (Displacement / loading): 106 %
   Structure weight / hull surface area: 98 lbs/sq ft or 480 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.84
      - Longitudinal: 1.59
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room

Warning: Beam between bulkheads too wide

This is the 'Royal Nissean' shrunk to <=160m.

Minor tweaking of hull dimensions, and newer power plant allows thickening of deck armor.

MB Height : 1.6 AWL to -1.5BWL = 3.1
3.1 cos(15) = 3.20953 =  3.21


                   
                   
                  1                        7
                   (d)                  (s)
A (B) [c]                                       [w] (X) (Y)
                   (e)                 (s)
                  2                         8
                   

The  casements is not viewed as a problem, Torpedo attack is difficult in high seas, both because the TBs are slowed, and because the torpedoes tend to breach the wave troughs.
                 

The Parthians expect floatplanes to taxi up to the fantail, so aircraft handling facilities are placed on the stern.


65t - Reserve

AD
81t -  Fire Control
25t - LR Radio
10t - SR Radio -dedicated AC command center
25t - Searchlight tower (NF)
25t - Hulesmeyer station keeping.

OD
5t - Paravanes
18t - 2TT3 21" 3t on stern
55t - 2x 20+5 - Fighter Float + Gunpwdr CAT
76t - 10% rotating wt Power Assist for 180L47

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

HBW
15t - Enhanced Hydrophones
8t - Extra Pumps.
5t+10t : Double wall tanks and AV stores.
5t : Enhanced Fire Ext for AV stores

Decks
+6.50  Forecastle Deck
+4.10   Weather Deck
+1.60   Battery Deck Top belt, Armored Deck
-0.90    2nd Deck
         -1.5   Bottom main belt
-2.40   1st Deck
-6.0   Engineering
-6.9   Keel

[Kaiser Kirk]

The casements on the XV version I'd want to explore if I can replace with some mount & hoist... and I can.
Probably the best heavy I can currently manage.

edit : Changed this to XV from XIV as the prior post was also XIV

Royal Nssean XV, Parthian Cruiser laid down 1927

Displacement:
   8,000 t light; 8,557 t standard; 9,499 t normal; 10,253 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (523.95 ft / 518.37 ft) x 57.94 ft x (22.64 / 23.97 ft)
   (159.70 m / 158.00 m) x 17.66 m  x (6.90 / 7.31 m)

Armament:
      12 - 7.09" / 180 mm 47.0 cal guns - 187.39lbs / 85.00kg shells, 180 per gun
     Breech loading guns in deck and hoist mounts, 1927 Model
     6 x 2-gun mounts on centreline, evenly spread
      3 raised mounts
      12 - 4.72" / 120 mm 43.0 cal guns - 55.12lbs / 25.00kg shells, 160 per gun
     Quick firing guns in deck and hoist mounts, 1927 Model
     6 x 2-gun mounts on side ends, majority forward
      8 - 3.54" / 90.0 mm 50.0 cal guns - 24.25lbs / 11.00kg shells, 400 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on side ends, evenly spread
      4 raised mounts
      12 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 800 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on sides, evenly spread
      4 raised mounts
     2 x 2-gun mounts on sides forward
      2 double raised mounts
      16 - 0.59" / 15.0 mm 70.0 cal guns - 0.12lbs / 0.05kg shells, 5,000 per gun
     Machine guns in deck mounts, 1927 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 3,185 lbs / 1,445 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.92" / 125 mm   352.49 ft / 107.44 m   10.40 ft / 3.17 m
   Ends:   Unarmoured
     Main Belt covers 105 % 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:   5.91" / 150 mm   1.97" / 50 mm      5.12" / 130 mm
   2nd:   0.59" / 15 mm   0.31" / 8 mm      0.31" / 8 mm
   3rd:   0.59" / 15 mm         -               -
   4th:   0.31" / 8 mm   0.31" / 8 mm      0.31" / 8 mm
   5th:   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 4.92" / 125 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 67,245 shp / 50,165 Kw = 30.00 kts
   Range 8,600nm at 14.00 kts
   Bunker at max displacement = 1,696 tons

Complement:
   480 - 625

Cost:
   £3.213 million / $12.850 million

Distribution of weights at normal displacement:
   Armament: 860 tons, 9.1 %
      - Guns: 860 tons, 9.1 %
   Armour: 1,684 tons, 17.7 %
      - Belts: 740 tons, 7.8 %
      - Armament: 201 tons, 2.1 %
      - Armour Deck: 695 tons, 7.3 %
      - Conning Tower: 48 tons, 0.5 %
   Machinery: 2,123 tons, 22.3 %
   Hull, fittings & equipment: 2,900 tons, 30.5 %
   Fuel, ammunition & stores: 1,499 tons, 15.8 %
   Miscellaneous weights: 433 tons, 4.6 %
      - Hull below water: 40 tons
      - Hull void weights: 40 tons
      - Hull above water: 33 tons
      - On freeboard deck: 149 tons
      - Above deck: 171 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     8,370 lbs / 3,796 Kg = 47.0 x 7.1 " / 180 mm shells or 1.3 torpedoes
   Stability (Unstable if below 1.00): 1.06
   Metacentric height 2.5 ft / 0.8 m
   Roll period: 15.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.98
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.489 / 0.498
   Length to Beam Ratio: 8.95 : 1
   'Natural speed' for length: 22.77 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   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 %,  26.25 ft / 8.00 m,  23.79 ft / 7.25 m
      - Forward deck:   33.00 %,  23.79 ft / 7.25 m,  21.33 ft / 6.50 m
      - Aft deck:   35.00 %,  13.45 ft / 4.10 m,  13.45 ft / 4.10 m
      - Quarter deck:   12.00 %,  13.45 ft / 4.10 m,  13.45 ft / 4.10 m
      - Average freeboard:      18.72 ft / 5.71 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 104.5 %
      - Above water (accommodation/working, high = better): 140.5 %
   Waterplane Area: 19,813 Square feet or 1,841 Square metres
   Displacement factor (Displacement / loading): 102 %
   Structure weight / hull surface area: 103 lbs/sq ft or 503 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.85
      - Longitudinal: 1.65
      - Overall: 0.91
   Caution: Hull subject to strain in open-sea
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room



MB Height : 1.6 AWL to -1.5BWL = 3.
3.21cos(12) = 3.169 =3.17

65t - Reserve

AD
86t -  Fire Control
25t - LR Radio
10t - SR Radio -dedicated AC command center
25t - Searchlight tower (NF)
25t - Hulesmeyer

OD
18t - 2TT3 21" 3t on stern
55t - 2x 20+5 - Fighter Float + Gunpwdr CAT
76t - 10% rotating wt Power Assist for 180L47

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

HBW
15t - Enhanced Hydrophones
25t - Extra Pumps.


Decks
+6.5  Forecastle Deck
+4.1  Weather Deck
+1.6   Battery Deck Top belt, Armored Deck
-1.00    Deck
         -1.5   Bottom main belt
-3.50 
-5.80   Engineering
-6.9  Keel, double bottom

[Kaiser Kirk]

Then exploring the other direction ... Further exploring the cost of speed.

This is intended more as a heavy scout or commerce raider.
If the Byzantines were not so persistant in mounting 191mm guns, she would be armed with 165mm...but they do, so she has 180mm.

The 180mm guns are laid out as below
Giving 6 guns broadside, 6 forward, and 4 aft.

Mounted in single M&H they are power assisted and have a rotating weight of 65.9 tons each

The Royal Nissean has 4x 180 forward, and 12x 180 broadside, all in two-gun mounts, for effectively 3.6 fore / 10.8 broadside.
This has similar armor, +2 knots to better pick WHO it fights, and all single guns, for 6 fore / 6 broadside...so more forward power, for the chase, but a significant downgrade in broadsides. ...but still a pretty good battery - all on a ship that better fits my drydocks.


Pouseki, Parthian Cruiser laid down 1927

Displacement:
   7,999 t light; 8,424 t standard; 9,639 t normal; 10,611 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (498.81 ft / 492.13 ft) x 53.58 ft x (24.61 / 26.51 ft)
   (152.04 m / 150.00 m) x 16.33 m  x (7.50 / 8.08 m)

Armament:
      8 - 7.09" / 180 mm 47.0 cal guns - 187.39lbs / 85.00kg shells, 190 per gun
     Breech loading guns in deck and hoist mounts, 1927 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     4 x Single mounts on sides, forward deck aft
      2 raised mounts - superfiring
      8 - 3.54" / 90.0 mm 54.0 cal guns - 24.25lbs / 11.00kg shells, 400 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     2 x 2-gun mounts on sides amidships
      2 raised mounts
     2 x 2-gun mounts on centreline ends, evenly spread
      2 double raised mounts
      8 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 900 per gun
     Anti-air guns in deck and hoist mounts, 1927 Model
     4 x 2-gun mounts on side ends, evenly spread
      4 raised mounts
      16 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 5,000 per gun
     Breech loading guns in deck mounts, 1927 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 1,748 lbs / 793 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.72" / 120 mm   374.02 ft / 114.00 m   10.86 ft / 3.31 m
   Ends:   Unarmoured
     Main Belt covers 117 % 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   1.57" / 40 mm      1.97" / 50 mm
   2nd:   0.31" / 8 mm   0.31" / 8 mm      0.31" / 8 mm
   3rd:   0.31" / 8 mm   0.31" / 8 mm      0.31" / 8 mm
   4th:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 1.97" / 50 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 1.97" / 50 mm

   - Conning towers: Forward 5.12" / 130 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 92,050 shp / 68,669 Kw = 32.00 kts
   Range 8,090nm at 16.00 kts
   Bunker at max displacement = 2,187 tons

Complement:
   486 - 632

Cost:
   £3.136 million / $12.543 million

Distribution of weights at normal displacement:
   Armament: 493 tons, 5.1 %
      - Guns: 493 tons, 5.1 %
   Armour: 1,622 tons, 16.8 %
      - Belts: 772 tons, 8.0 %
      - Armament: 154 tons, 1.6 %
      - Armour Deck: 646 tons, 6.7 %
      - Conning Tower: 50 tons, 0.5 %
   Machinery: 2,906 tons, 30.1 %
   Hull, fittings & equipment: 2,695 tons, 28.0 %
   Fuel, ammunition & stores: 1,640 tons, 17.0 %
   Miscellaneous weights: 284 tons, 2.9 %
      - Hull below water: 27 tons
      - Hull void weights: 29 tons
      - Hull above water: 6 tons
      - On freeboard deck: 87 tons
      - Above deck: 135 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6,979 lbs / 3,166 Kg = 39.2 x 7.1 " / 180 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 2.4 ft / 0.7 m
   Roll period: 14.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.76
   Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.520 / 0.531
   Length to Beam Ratio: 9.19 : 1
   'Natural speed' for length: 22.18 kts
   Power going to wave formation at top speed: 63 %
   Trim (Max stability = 0, Max steadiness = 100): 48
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: -6.56 ft / -2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   15.00 %,  24.93 ft / 7.60 m,  22.15 ft / 6.75 m
      - Forward deck:   38.00 %,  22.15 ft / 6.75 m,  19.69 ft / 6.00 m
      - Aft deck:   38.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Quarter deck:   9.00 %,  19.69 ft / 6.00 m,  20.67 ft / 6.30 m
      - Average freeboard:      20.73 ft / 6.32 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 116.0 %
      - Above water (accommodation/working, high = better): 142.4 %
   Waterplane Area: 17,893 Square feet or 1,662 Square metres
   Displacement factor (Displacement / loading): 103 %
   Structure weight / hull surface area: 88 lbs/sq ft or 429 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.81
      - Longitudinal: 2.28
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room


            C (E)           
A (B)                             (Y)   X
            D (F)           

Armor Belt is from +1m to -1.7m and
is outsloped 15deg
3.2 /cos (15) = 3.3128 = 3.31


Misc. Weight :
30t: Construction Resv

25t : LR Radio
50t : FC
25t : Searchlight tower (NF)
25t : Hulesmeyer proximity detector
10t : SR Radio for A/C

52t : 4T3 21" TT + 4 roll down shutters (4t)
5t : Paravanes
20t : Midships Scout Floatplane
5t : Gunpowder Cat
5t : hanger


HAW
6t : CO2 Compressor AC

HBW
6t : Extra Pumps
6t :  5t extra AvGas, 1t Doublewall tank
15t : Enhanced Hydrophones

Decks :

+6.00 : Forecastle deck
+3.50 : Battery deck/ weather deck
+1.00 : Main Armor deck, top main belt
-1.70  : 1st deck,  bottom armor belt
-5.50 : Engineering
-6.73 : Keel, double bottom

[Jefgte]

...If the Byzantines were not so persistant in mounting 191mm guns, she would be armed with 165mm...but they do, so she has 180mm...

Byzantine had 4 x 3000t cruiser with 152 (HMS Warspite guns).
I have not developed the 152 (HMS Ajax) yet. They will have a volume of fire equivalent to 165.
Note that I also have 203 (HMS Norfolk). The different SS that I have done does not give me satisfaction.

[Kaiser Kirk]

...If the Byzantines were not so persistant in mounting 191mm guns, she would be armed with 165mm...but they do, so she has 180mm...

Byzantine had 4 x 3000t cruiser with 152 (HMS Warspite guns).
I have not developed the 152 (HMS Ajax) yet. They will have a volume of fire equivalent to 165.
Note that I also have 203 (HMS Norfolk). The different SS that I have done does not give me satisfaction.

I have a lot of cruisers with 165mm, and the Sayiddas feature that rather than the 130, but most of my cruisers do not
have sufficient speed advantage over yours to bring their 165s into useful combat distance vs. your armor without being
well within the vulnerability zone to those 191s....and it seemed the Byzantines were focusing on 191s, so I've focused on my closest equivalent gun, the 180L47.

I did notice you developed the 203mm and ranges are getting longer overall, giving the 191 more penetration. 
I was happy with 35mm when ranges are shorter vs. the 191, but with long ranges and heavier shells I'm aiming for 50-55mm.
That winds up being rather expensive in tonnage and is forcing some of these tradeoffs. 
Its also a reason I am willing to consider the 2-gun 180, while I would prefer a fast-training gun for short ranges, it's looking less likely that engagements will be there.

With those considerations, I've had to abandon my 6000 ton cruiser series, though I have a design for a 6500t , 31knt  version of the Pouseki....basically my KENT class.  Save 1500 tons for each built and build 4 hulls instead of 3.

Originally I planned a 210mm gun, but I just don't see the need. I can manage a fairly decent 230mm 'light armored cruiser' design for only a little more tonnage than a 210 (or 203), but allot more 'punch'. I'm thinking of making one and calling it the 'Royal Yacht'.

[Jefgte]

The 3000t Armored Gun Boat with 3T2x191 does not give me complete satisfaction - 25.7kts and 4500nm range is really low.
3000t is not enough to make a ''respectable little cruiser''.

I would prefer a "classic Byzantine" with 6x191-30kts-10000nm, not too expensive (4900t) which can be built in large series.

[Kaiser Kirk]

The 3000t Armored Gun Boat with 3T2x191 does not give me complete satisfaction - 25.7kts and 4500nm range is really low.
3000t is not enough to make a ''respectable little cruiser''.

I was somewhat impressed at the 25.7 knots, my efforts at that type of ship wind up at 23-24knots.
I do tend to try to make my ships 'riverine' and 'littoral', aiming for maneuverable (short) and  shallow drafts,
which harms their speed and seakeeping.

The 'classic Byzantine' is the same concept I'm exploring at with the 6500-7250ton Pouseki variants.
Save a little tonnage, have more hulls, better coverage of more sea regions, and less disastrous to the fleet when one is lost.

[Jefgte]

In fact, we have 3 categories of cruisers
The small 3000t
Medium 6000t
The big 8000t.

Make your choice !
Many small (weak and slow)
Medium...
A few fat ones who demolish the others.
:)

[Kaiser Kirk]

That is pretty much how I've got had it divided. I'm trying to project what I'll be building in the future.
I don't think I'll be making more than 12-16 3000t 'armored frigates' and then that tonnage goes into either 6000 or 8000 ton cruisers.

The 3000 tonners - the 'armored frigates' are meant for the commerce and scouting side of things.
They are large enough for independent operations (plus the 0.5 destroyer vs 0.75/.9 cruiser includes stores, redundancies etc), can fight a pirate or AMC, and provide a sensor platform. It is a necessary function, and these show the flag for Parthia world wide, and if someone wants to dedicate a heavier vessel to chase them around the ocean, that's a tonnage win for me.

The 5-6000 tonners are the mediums which can do a variety, both scout (newer faster) and close screen (older slower).  This is where that 8000 ton 32kt would also go, a bit of a hybrid, but the tonnage 'cost' I don't like. A 6500-7250t 31knt is appealing in the same role.

The 8000 tonners are the heavier cruisers meant to operate as an advance skirmish line to push away enemy scout, or even in small divisions for independent ops. That's the current Royal Nissean and I'll be building a few more to provide enough hulls.

My retention of ACs gives me the big independent cruiser role, and the backup for the scoutline.

All of which is becoming more problematic as powers field fast heavy ships and bigger guns on cruisers and and and...

[TacCovert4]

I'm just generally shocked that you can get 12 x 180 on an 8000t hull with a real belt and 30kt.