Parthian vessels 1916 onwards

[Kaiser Kirk]

Longer term, it seems like the 29knot refurbishment is worthwhile.
But that cost in $/BP for 4 vessels will be difficult to fit in.

Short term, I think rebuilding the Gilgamesh class in 1925 is more important.
The Mayan war highlights that need.

I can probably figure out a way to pay for simple regunning of these ships in 1924.5,
and then re-engine & uparmor them in 1926/27.

..now to figure out how to pay for this...

Refitted in 1922, the Parthians seek to Regun the vessels in 1924.5
This is a full on refurbishment, with a reconfiguration of the superstructure and adjust the trim. This also allows replacing the old ventelation with new CO2 Compressor AC and adding a scout plane.

The main and secondary batteries get replaced by newer models.
The ancient 60mm Anti-boat guns were replaced in 1922, but the new 57mm are augmented by 15mm AAMGs.

Original Wts
255 Gun + Mount : 265+620 = 885
255mm mag : 321

120mm mag (both) : 59+88 = 147

57mm mag : 22


Refurbished weights
255mm Gun + Mount = 245 + 573 = 818
255mm mag : 320 = Same (has to be same or less)
Turret Armor = 225

120mm Gun+Mount : 56+116 = 172
120mm mag : 59+88 = Same
Gun Armor : 21+79 = 100

57mm mag : same
new gun shields : 1.5

15mm
15mm guns & mounts : 6.3+15 = 21.3
new gun shields : 3.9
new mag : 5.1

Misc wieghts :
Resv : 15t

AD
New Fire Control : 102  (-8)

OD
- old ventilation (-75)
+ CO2 Compressor AC : 15t
+ Scout floatplane : 20t
+2nd Gunpower Cat : 5t
+ Enlarged Hangers : (-5) 10t
+paravanes : 5t


Subtotals :
Refurb : 20% of original : 14.747 * 20% = 2.9494
A. Guns & Mounts : 1011.3 =1012
B. Armor : 330.4 + misc wt 157 = 488
C. Hull, equip  : 0
D. NF Misc Wt/mags. : 5

Cost :
Base : $2.9494
A: $2.024,  1.012bp
B: $0.488, 0.488bp
C: $
D: $0.0025

subTotal : $5.4639, 1.5bp

Total : $5.46, 1.5bp

Asbara BR24, Parthian Armored Cruiser laid down 1908, refitted 1922, refurbished 1924

Displacement:
   14,744 t light; 15,584 t standard; 17,333 t normal; 18,733 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (583.99 ft / 577.43 ft) x 68.90 ft x (26.25 / 27.96 ft)
   (178.00 m / 176.00 m) x 21.00 m  x (8.00 / 8.52 m)

Armament:
      8 - 10.04" / 255 mm 47.0 cal guns - 599.66lbs / 272.00kg shells, 120 per gun
     Breech loading guns in turret on barbette mounts, 1917 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      8 - 4.72" / 120 mm 43.0 cal guns - 55.12lbs / 25.00kg shells, 240 per gun
     Quick firing guns in deck mounts, 1912 Model
     8 x Single mounts on side ends, evenly spread
      4 raised mounts - superfiring
      12 - 4.72" / 120 mm 43.0 cal guns - 55.12lbs / 25.00kg shells, 240 per gun
     Quick firing guns in casemate mounts, 1912 Model
     12 x Single mounts on sides, evenly spread
      12 hull mounts in casemates- Limited use in heavy seas
      12 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 500 per gun
     Anti-air guns in deck mounts, 1917 Model
     4 x 2-gun mounts on sides, 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 - 0.12lbs / 0.05kg shells, 5,000 per gun
     Anti-air guns in deck mounts, 1918 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 5,981 lbs / 2,713 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   7.68" / 195 mm   340.68 ft / 103.84 m   12.17 ft / 3.71 m
   Ends:   1.97" / 50 mm   236.71 ft / 72.15 m   12.17 ft / 3.71 m
   Upper:   3.94" / 100 mm   307.87 ft / 93.84 m   6.56 ft / 2.00 m
     Main Belt covers 91 % of normal length

   - Hull void:
      0.00" / 0 mm   345.47 ft / 105.30 m   18.86 ft / 5.75 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   8.46" / 215 mm   3.94" / 100 mm      7.68" / 195 mm
   2nd:   0.98" / 25 mm   0.31" / 8 mm            -
   3rd:   3.94" / 100 mm   0.98" / 25 mm      0.98" / 25 mm
   4th:   0.31" / 8 mm         -               -
   5th:   0.31" / 8 mm         -               -

   - Protected deck - multiple decks:
   For and Aft decks: 3.35" / 85 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 1.57" / 40 mm

   - Conning towers: Forward 7.68" / 195 mm, Aft 3.94" / 100 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 64,013 shp / 47,754 Kw = 27.00 kts
   Range 8,800nm at 12.00 kts
   Bunker at max displacement = 3,148 tons

Complement:
   754 - 981

Cost:
   £1.433 million / $5.731 million

Distribution of weights at normal displacement:
   Armament: 1,012 tons, 5.8 %
      - Guns: 1,012 tons, 5.8 %
   Armour: 4,645 tons, 26.8 %
      - Belts: 1,917 tons, 11.1 %
      - Armament: 1,034 tons, 6.0 %
      - Armour Deck: 1,526 tons, 8.8 %
      - Conning Towers: 168 tons, 1.0 %
   Machinery: 3,233 tons, 18.7 %
   Hull, fittings & equipment: 5,365 tons, 30.9 %
   Fuel, ammunition & stores: 2,590 tons, 14.9 %
   Miscellaneous weights: 490 tons, 2.8 %
      - Hull below water: 178 tons
      - Hull void weights: 10 tons
      - Hull above water: 40 tons
      - On freeboard deck: 85 tons
      - Above deck: 177 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     18,760 lbs / 8,509 Kg = 37.1 x 10.0 " / 255 mm shells or 2.1 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 3.5 ft / 1.1 m
   Roll period: 15.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.74
   Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.581 / 0.589
   Length to Beam Ratio: 8.38 : 1
   'Natural speed' for length: 24.03 kts
   Power going to wave formation at top speed: 53 %
   Trim (Max stability = 0, Max steadiness = 100): 46
   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:   26.00 %,  26.44 ft / 8.06 m,  24.08 ft / 7.34 m
      - Forward deck:   23.00 %,  24.08 ft / 7.34 m,  21.69 ft / 6.61 m
      - Aft deck:   36.00 %,  13.48 ft / 4.11 m,  13.48 ft / 4.11 m
      - Quarter deck:   15.00 %,  13.48 ft / 4.11 m,  15.12 ft / 4.61 m
      - Average freeboard:      18.77 ft / 5.72 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 87.7 %
      - Above water (accommodation/working, high = better): 123.8 %
   Waterplane Area: 28,584 Square feet or 2,656 Square metres
   Displacement factor (Displacement / loading): 108 %
   Structure weight / hull surface area: 132 lbs/sq ft or 642 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.42
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room

Misc Weight :  as refitted 1922
Const Resv : 60y
AD
110t Fire Control 1918
25t  LR Radio
25t  Searchlight Tower (NF)
25t  Hulesmeyer

OD
75t-  Additional ventilation
25t - Armed Float Plane
5t  - Gunpowder Cat
5t  - Hanger structure amidships

HABW
40t - Torpedo flat on stern, above armor deck, 18" , 2 tubes each beam firing through ports.

HBW
178t - torpedo nets



Decks : Engineering spaces 4m high, other decks 2.5m
+6.61m Forecastle deck
+4.11m  Weather Deck, Top of upper belt  (covers B to Y), top 25mm upper armored deck
+2.11m        Top of Main belt, protects slopes of deck from diving shells.
+1.61m  3rd, Armor Deck,  Crown of 60mm protective deck
-0.89m   2nd deck. lower edge of protective deck,  bottom of main belt
-1.60m          bottom of main belt
-3.39m  1st Deck

[Kaiser Kirk]

peeking forward to 1925, the refurbishment of the Gilgamesh class comes out to $15.64, 5.9bp / vessel.

I could go for the full reconstruction to add a torpedo defense system, which would take sacrificing the turbo-electric drive and existing end belts. There could be deep internal bulges and 38mm bulkhead, which would boost the Torpedo resistance to 8.1 (from 5).  The 'opportunity' cost is another $1 and 2.3 BP.

That would also open the ability to remove "Q" and fit more engines and deck armor with the savings.
I may price that out later.

In the meantime, the proposed refurbishment winds up with 10x 333mm firing overweight 605kg shells,
a waterline Belt+Deck combo of ~487mm, and a vertical deck of ~106mm. 
That should make it very very servicable as a '2nd rate' battleship

1925 refurbishment of the Gilgamesh class.

Subtotal Costs :
A : Guns and Machinery
main :  584+1239 : 1823
second : 71+268 : 339
tertiary : 54+110 : 164
quint : 0.7+.53 : 1.23
Machinery : 900t

B: Armor + Func wt
Gun armor - main : 696
Sec :97
Tert : 110
Quad : 1.5
Quin : 3.9
+Deck (below) : 931
func Misc : 830

C: Trim only, no hull change

D: Fuel Ammo, stores
Magazines (unchanged or less tons) : 1107
Fuel  : 2723

Subtotals :
Base cost : 20% of 22990/1000 = $4.598

A: 2327.23+900 = 3227.23 /1000 = $(3.23*2), 3.23bp = $ 6.46, 3.23bp

B : 1835.5639 armor + 830 = 2665.5639 /1000 = $2.67 , 2.67bp

C : --

D: $(1107+2723)/2000 = $1.915

Total : $15.643, 5.9bp


New armanents 345->333, 165 ->130
bulletproof shields for 57mm , new 15mm


+Armor
35mm box around magazines + machinery :179
Laminate +30mm main deck (70/100/70) : 752
total : 931
Leave upper deck at 35mm
Box included in main deck armorwt.

Effective main belt + PD : 420 + (((65+30*.8)*1.5)/2) = 487mm

Effective verticle : 65+(30*.8)+(35/2) = 106.5mm

35mm box around mag & machinery is backing both of these.

Reserve : 10t

Misc Wt :
AD
235  FC 1918
25    LR radio
25    Hulesmeyer
25    Searchlight Tower (NF)

OD
5    Paravanes
40  2x Scoutfloatplanes
5    Gunpowder Cat
10  Hanger

HAW
23   CO2 Compressor AC
25   Additional pumps

HBW
162   Torpedo Nets
225   Turbogenerators
25t   Additional Pumps

Gilgamesh R1925, Parthian Dreadnaught laid down 1906 (Engine 1925)

Displacement:
   22,941 t light; 24,570 t standard; 26,083 t normal; 27,293 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (538.06 ft / 531.50 ft) x 88.58 ft (Bulges 98.43 ft) x (29.53 / 30.77 ft)
   (164.00 m / 162.00 m) x 27.00 m (Bulges 30.00 m)  x (9.00 / 9.38 m)

Armament:
      10 - 13.11" / 333 mm 43.0 cal guns - 1,333.80lbs / 605.00kg shells, 99 per gun
     Breech loading guns in turret on barbette mounts, 1917 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     1 x Twin mount on centreline, forward deck aft
      16 - 5.12" / 130 mm 50.0 cal guns - 77.16lbs / 35.00kg shells, 300 per gun
     Quick firing guns in deck and hoist mounts, 1913 Model
     8 x 2-gun mounts on side ends, evenly spread
      4 raised mounts - superfiring
      12 - 5.12" / 130 mm 50.0 cal guns - 77.16lbs / 35.00kg shells, 300 per gun
     Quick firing guns in casemate mounts, 1913 Model
     12 x Single mounts on sides, evenly spread
      12 hull mounts in casemates- Limited use in heavy seas
      12 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 300 per gun
     Anti-air guns in deck mounts, 1917 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, 500 per gun
     Machine guns in deck mounts, 1917 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 15,580 lbs / 7,067 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   16.5" / 420 mm   345.47 ft / 105.30 m   9.84 ft / 3.00 m
   Ends:   3.94" / 100 mm   185.99 ft / 56.69 m   9.84 ft / 3.00 m
   Upper:   5.31" / 135 mm   312.66 ft / 95.30 m   11.98 ft / 3.65 m
     Main Belt covers 100 % of normal length

   - Hull Bulges:
      0.47" / 12 mm   345.47 ft / 105.30 m   24.61 ft / 7.50 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   16.5" / 420 mm   7.09" / 180 mm      15.0" / 380 mm
   2nd:   1.97" / 50 mm   1.38" / 35 mm      1.38" / 35 mm
   3rd:   5.31" / 135 mm   0.98" / 25 mm      0.98" / 25 mm
   4th:   0.31" / 8 mm         -               -
   5th:   0.31" / 8 mm         -               -

   - Protected deck - multiple decks:
   For and Aft decks: 5.28" / 134 mm
   Forecastle: 2.36" / 60 mm  Quarter deck: 2.36" / 60 mm

   - Conning towers: Forward 16.54" / 420 mm, Aft 2.95" / 75 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 27,734 shp / 20,690 Kw = 20.00 kts
   Range 7,100nm at 14.00 kts
   Bunker at max displacement = 2,723 tons

Complement:
   1,026 - 1,334

Cost:
   £2.081 million / $8.324 million

Distribution of weights at normal displacement:
   Armament: 2,348 tons, 9.0 %
      - Guns: 2,348 tons, 9.0 %
   Armour: 10,205 tons, 39.1 %
      - Belts: 3,637 tons, 13.9 %
      - Bulges: 149 tons, 0.6 %
      - Armament: 3,036 tons, 11.6 %
      - Armour Deck: 3,014 tons, 11.6 %
      - Conning Towers: 369 tons, 1.4 %
   Machinery: 900 tons, 3.5 %
   Hull, fittings & equipment: 8,647 tons, 33.2 %
   Fuel, ammunition & stores: 3,142 tons, 12.0 %
   Miscellaneous weights: 840 tons, 3.2 %
      - Hull below water: 412 tons
      - Bulge void weights: 10 tons
      - Hull above water: 48 tons
      - On freeboard deck: 60 tons
      - Above deck: 310 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     42,425 lbs / 19,244 Kg = 37.7 x 13.1 " / 333 mm shells or 5.1 torpedoes
   Stability (Unstable if below 1.00): 1.17
   Metacentric height 5.5 ft / 1.7 m
   Roll period: 17.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.70
   Seaboat quality  (Average = 1.00): 1.54

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.591 / 0.593
   Length to Beam Ratio: 5.40 : 1
   'Natural speed' for length: 23.05 kts
   Power going to wave formation at top speed: 46 %
   Trim (Max stability = 0, Max steadiness = 100): 46
   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 %,  25.39 ft / 7.74 m,  22.54 ft / 6.87 m
      - Forward deck:   43.00 %,  22.54 ft / 6.87 m,  19.69 ft / 6.00 m
      - Aft deck:   22.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  13.12 ft / 4.00 m
      - Average freeboard:      18.19 ft / 5.54 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 55.3 %
      - Above water (accommodation/working, high = better): 113.2 %
   Waterplane Area: 34,146 Square feet or 3,172 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 194 lbs/sq ft or 948 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.99
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate 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

Misc. Weight : 1922 BR

1t Const Resv.

AD
243t 1918 FC
25t   LR Radio
5t    Basic Night Fighting

OD
115t Additional Ventilation and evaporative cooling
5t     Paravanes

HBW
162t - torpedo nets
40t - 4x TT, 2 each beam, 20 x 18" Torpedoes


+ 6.0 forecastle, Top of upperbelt for 66%, 30mm protective deck
+3.5 weather, Top of upper belt for 33%
+1.5  Top of Main Belt
+1.0  3rd , Crown of 65mm protective deck
-1.5   2nd , bottom of belt, edge of protective deck, top of bulge
-4.0 1st
-8.56 Engineering Deck

[Kaiser Kirk]

While I explored the Tillman concept above, I got to wondering what the 'bottom' of the price range looks like for me.

While others have their 15-16" guns, the Parthian 365L50 is an excellent gun.
Part of that is due to our rules work - the fixed ME for guns in certain classes doesn't change if you're at the upper vs. lower end.
Meanwhile the 365L50 came after the 1.2 weight shells, making it nearly as good as some of the larger weapons.

So I can use that.

Real world, the reason for 10 guns was to allow two alternating 5 gun broadsides, with allowance for 1 gun to miss the cycle. Giving the 4 gun ladder.
As turrets got better, and that bonus gun not being needed all the time, you see adoption of 8 gun broadsides.

I still need a decent secondary, but I have enough escort vessels that I think I can skip the cruiser-level 165mm, and go with the 130mm.
I like a hexagon pattern of 2-gun mounts for that, allowing 6 to bear fore/aft and 8 each broadside.

Combining an inclined belt with a heavy armor deck ala Nelson, and it becomes a tough nut with substantial protected floatation.

The 20knot Parthian battleline means shorter ships, smaller engines, and plenty of below decks room.
Toss in electric drive and the ships will adapt to damage well.
An exterior bulge, and then a deep internal hull TDS gives the ship a massive torpedo absorption on paper.

The TDS rises above the waterline to meet the bottom of the Armordeck, also providing splinter protection behind the main belt.

Because the Parthians are paranoid, they will still hang torpedo nets off the ships.
I actually discontinued them ~1909, but with the Caicos war, added them back.
Now with the Mayans, instead of them failing 1/3 of the time like they should have, each roll succeeded,
and made them look better than they are.

Overall, compared to the Kalifern (building) class, which is ~8000t, aka 1 cruiser, more expensive,
she has half the guns. You can buy 4 Kaliferns for 5 of these, with 64guns vs. 40guns.

Gilgamesh...modern, Parthian Dreadnaught laid down 1925

Displacement:
   30,350 t light; 32,402 t standard; 34,707 t normal; 36,551 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (557.74 ft / 551.18 ft) x 108.27 ft (Bulges 114.83 ft) x (29.53 / 30.94 ft)
   (170.00 m / 168.00 m) x 33.00 m (Bulges 35.00 m)  x (9.00 / 9.43 m)

Armament:
      8 - 14.37" / 365 mm 50.0 cal guns - 1,884.95lbs / 855.00kg shells, 131 per gun
     Breech loading guns in turret on barbette mounts, 1925 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      12 - 5.12" / 130 mm 50.0 cal guns - 77.16lbs / 35.00kg shells, 275 per gun
     Quick firing guns in turret on barbette mounts, 1925 Model
     4 x 2-gun mounts on side ends, evenly spread
     2 x 2-gun mounts on centreline ends, evenly spread
      2 double raised mounts
      12 - 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, 1925 Model
     6 x 2-gun mounts on sides, evenly spread
      16 - 2.24" / 57.0 mm 60.0 cal guns - 6.19lbs / 2.81kg shells, 900 per gun
     Anti-air guns in deck mounts, 1925 Model
     6 x 2-gun mounts on side ends, majority forward
      6 raised mounts
     2 x 2-gun mounts on sides amidships
      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, 1925 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 16,397 lbs / 7,438 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.6" / 345 mm   345.47 ft / 105.30 m   21.49 ft / 6.55 m
   Ends:   1.38" / 35 mm   185.99 ft / 56.69 m   12.01 ft / 3.66 m
     19.72 ft / 6.01 m Unarmoured ends
     Main Belt covers 96 % of normal length
     Main Belt inclined -12.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      2.24" / 57 mm   345.47 ft / 105.30 m   40.88 ft / 12.46 m
   Beam between torpedo bulkheads 62.34 ft / 19.00 m

   - Hull Bulges:
      0.35" / 9 mm   345.47 ft / 105.30 m   21.33 ft / 6.50 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   16.5" / 420 mm   7.09" / 180 mm      15.0" / 380 mm
   2nd:   3.94" / 100 mm   2.56" / 65 mm      2.56" / 65 mm
   3rd:   1.38" / 35 mm   0.98" / 25 mm      0.98" / 25 mm
   4th:   0.31" / 8 mm         -               -
   5th:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 5.91" / 150 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 2.95" / 75 mm

   - Conning towers: Forward 14.96" / 380 mm, Aft 2.95" / 75 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 34,120 shp / 25,454 Kw = 20.00 kts
   Range 9,000nm at 14.00 kts
   Bunker at max displacement = 4,149 tons

Complement:
   1,270 - 1,652

Cost:
   £8.665 million / $34.660 million

Distribution of weights at normal displacement:
   Armament: 3,267 tons, 9.4 %
      - Guns: 3,267 tons, 9.4 %
   Armour: 14,047 tons, 40.5 %
      - Belts: 4,779 tons, 13.8 %
      - Torpedo bulkhead: 1,173 tons, 3.4 %
      - Bulges: 97 tons, 0.4 %
      - Armament: 3,139 tons, 9.0 %
      - Armour Deck: 4,450 tons, 12.8 %
      - Conning Towers: 411 tons, 1.2 %
   Machinery: 1,108 tons, 3.2 %
   Hull, fittings & equipment: 10,617 tons, 30.6 %
   Fuel, ammunition & stores: 4,358 tons, 12.6 %
   Miscellaneous weights: 1,311 tons, 3.8 %
      - Hull below water: 501 tons
      - Bulge void weights: 100 tons
      - Hull above water: 62 tons
      - On freeboard deck: 246 tons
      - Above deck: 402 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     60,667 lbs / 27,518 Kg = 40.9 x 14.4 " / 365 mm shells or 14.0 torpedoes
   Stability (Unstable if below 1.00): 1.23
   Metacentric height 8.3 ft / 2.5 m
   Roll period: 16.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.41
   Seaboat quality  (Average = 1.00): 1.25

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.650 / 0.653
   Length to Beam Ratio: 4.80 : 1
   'Natural speed' for length: 23.48 kts
   Power going to wave formation at top speed: 47 %
   Trim (Max stability = 0, Max steadiness = 100): 57
   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:   17.50 %,  25.92 ft / 7.90 m,  23.46 ft / 7.15 m
      - Forward deck:   27.50 %,  23.46 ft / 7.15 m,  21.00 ft / 6.40 m
      - Aft deck:   37.50 %,  12.80 ft / 3.90 m,  12.80 ft / 3.90 m
      - Quarter deck:   17.50 %,  12.80 ft / 3.90 m,  12.80 ft / 3.90 m
      - Average freeboard:      17.43 ft / 5.31 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 89.6 %
      - Above water (accommodation/working, high = better): 115.1 %
   Waterplane Area: 45,715 Square feet or 4,247 Square metres
   Displacement factor (Displacement / loading): 111 %
   Structure weight / hull surface area: 204 lbs/sq ft or 996 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.57
      - Overall: 1.00
   Adequate 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

Armor Belt : Covers from +3.9m to -2.5m

For +3.9 to -1.0 is full thickness 350mm
From -1.0 to -2.5 tapers to 310mm

Outsloping
Total : 6.4 / cos (12) = 6.55
Upper : (6.4 - 1.5)/ cos (12) = 5.01
Tapered : 1.5/cos (12) = 1.57


This is 1 rectangle 310mm * 6.55m =  2030500 mm3
+ 1 rectangle  40mm x (5.01) = 200400mm3
+ 1 triangle 
b*1/2 * h = 40mm/2 x 1.57m = 31400mm3

Total : 2,262,300mm3
Over 6.55 m (6,550 mm)
= 345.39

Bow and stern have the traditional protective deck,
but with +35mm slopes, for 70/110 respectively


Outsloped 12degrees
6.4/cos(12) = 6.5429 = 6.55


100t - Reserve

AD
327t - FC
25t - NF searchlight tower
25t - Hulesmeyer 10km  proximity detector
25t - LR Radio

OD
5t Paravanes
100t - Admiral Quarters
31t - Extra fire ext

Quarterdeck floatplanes launch & recovery
50t - 2x 25t Fighter Float
40t - 2x 20t Scout Float
10t - 2x Gunpowder cat
10t - underdeck hanger space

HAW
31t - CO2 Compressor AC
31t - Extra Fire Ext

HBW
31t - Extra Pumps
20t - Doublewall Av Gas tanks
5t- Av Gas fire Ext
168t - Torpedo nets
277t - Turboelectric generators

6.4m - Forecastle Deck
3.9m - Weather Deck, Armor Deck, top main belt, top TDS
1.4m - Main Deck
-1.1m - 2nd deck
    -2.5 - Bottom main belt
-3.6m - 1st deck
-7.6m - Engineering
-8.6m - Double bottom
-9.0m - Keel

[Jefgte]

You have nearly Musashi survability.

;)

[The Rock Doctor]

But Musashi didn't survive...

While I don't care for the speed, it's certainly a capable and affordable battleship in all other respects.

[Kaiser Kirk]

The speed is rooted in a pre-game decision to explore guns / armor > speed
Likewise, while I personally don't like quads, I decided to put them on Parthian ships..
I could do this as a pair of quads I guess.

Anyhow, while I settled on that speed to start, I've struggled to decide
on moving to a faster speed, and internally justifying it.

The concept is that SLOC are the key, and as long as I'm faster than a merchant,
and there's strategic points,  the other side will eventually have to fight me.

The fact the Byzantines keep building 21 knot ships also means my biggest neighbor
is in the same speed range.

With others.. what I give up is choice of range when weather allows that...
so I try to make those all bad choices.
For the same tonnage I should have either more, or tougher ships.

Though I will admit that I expect once combat has really started,
ships on both sides will get damaged, and fleet speeds will plummet.
Looking at history, when the hull gets opened by shells or torpedoes,
I keep seeing damaged ships restricted to the high teens for speed,
in order to keep internal bulkheads from collapsing. That doesn't translate
well to in-game damage, but is a consideration for me- speed seems to
be the first thing ships loose when damaged. Fleets fight at a couple
knots below max speed, so underwater damage should not disrupt my
battleline.

The major flaw is that is when I send ships off to territories, or need to split them up,
I loose the conceptual ability to disengage.
That is why the Stormbringer pair becomes the response force, at 26knts not
blazing, but can beat anything that can catch them.

Still, each generation of ships seems faster than the last, which makes older
ships almost guaranteed to be slower, even if they didn't start that way.

It's a conundrum.

But I try to keep my cruisers 'close' in speeds, and faster than other players Heavies (mostly),
while keeping the battleline the same. The exception are the Stormbringer pair
which are meant to either counter Jefgte's BCs, or give my scout cruisers 'heavies' to fall back on
OR serve directly in the battleline.

I expected game play to move me off that 20knt speed base,
and I've been toying with jumping to 23 knots, slightly faster than the Byzantine line,
or even moving up to 26, but both would be after the Kaliferns complete.
I may even cease Dreadnaughts to focus on Carriers or 'Large Armored Cruisers'... we shall see

But the wars so far ..

skirmish - Wino-Iberian : Speed relevant, but more 'new' vs 'obsolete'.

Sino-Japanese I : Near Big Fleet slugfest, speed irrelevant.

Sino-Japanese II : Not enough to tell

Caicos : Big Fleet slugfest, speed irrelevant

Mayan : Speed mattered at Martinique, gross battleline mismatch.
The rest...battleline speed didn't matter much.
Granted it was a bit of an odd war, where there wasn't more battleline: battleline conflict,
The Mayans achieved their goals in the Atlantic theater, while being tremendously outnumbered in the Pacific.
...and the Parthians don't know about the details of the various Mayan sorties.

One take home is that cruising speed is where you spend most of your time, and cruising range and time on station
matter. I've already been moving to more range to

[Jefgte]

...The fact the Byzantines keep building 21 knot ships also means my biggest neighbor
is in the same speed range...

Concepts do not change.
1 => Battleships with their firepower work like a steamroller.
2 => If you catch me, I sink you.
(Hood catches Tennessee, Tennessee sinks Hood)

[Kaiser Kirk]

Going back to carrier considerations.

In 1924.5 I'll be refurbishing my 1918-tech Experimental Carrier (converted 1922 from a torpedo boat carrier)
to a 1922-tech carrier.

..don't think I need an SS for that, as it repurposes existing hull weight.

In 1925, I can lay down a couple of those 13,500 flight deck cruisers.
Goal is to provide fighters to deal with enemy recon/spotting, and then launch some of my own.

Sometime after that...I'll be looking at true carrier. Still likely pretty modest.
It's still early, so heavily armed and armored will continue to be the theme.

Very much a work in progress...
Desert Wind, Parthian Carrier laid down 1926

Displacement:
   27,000 t light; 27,968 t standard; 31,633 t normal; 34,564 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (583.99 ft / 577.43 ft) x 108.27 ft x (27.33 / 29.48 ft)
   (178.00 m / 176.00 m) x 33.00 m  x (8.33 / 8.98 m)

Armament:
      16 - 7.09" / 180 mm 47.0 cal guns - 187.39lbs / 85.00kg shells, 160 per gun
     Breech loading guns in casemate mounts, 1926 Model
     16 x Single mounts on sides, evenly spread
      16 hull mounts in casemates- Limited use in heavy seas
      8 - 3.54" / 90.0 mm 60.0 cal guns - 24.25lbs / 11.00kg shells, 400 per gun
     Anti-air guns in deck mounts, 1926 Model
     8 x Single mounts on side ends, evenly spread
      8 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Anti-air guns in deck mounts, 1926 Model
     8 x Single mounts on sides, evenly spread
      24 - 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
     4 x Single mounts on sides, evenly spread
     2 x 2 row quad mounts on sides, forward deck centre
      2 double raised mounts
      Weight of broadside 3,248 lbs / 1,473 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.36" / 60 mm   375.33 ft / 114.40 m   12.01 ft / 3.66 m
   Ends:   1.38" / 35 mm   202.07 ft / 61.59 m   12.01 ft / 3.66 m
     Main Belt covers 100 % of normal length
     Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      2.24" / 57 mm   375.33 ft / 114.40 m   28.18 ft / 8.59 m
   Beam between torpedo bulkheads 62.34 ft / 19.00 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:   1.38" / 35 mm   1.38" / 35 mm      1.38" / 35 mm
   2nd:   0.31" / 8 mm         -               -
   3rd:   0.31" / 8 mm         -               -
   4th:   0.31" / 8 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 2.36" / 60 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 2.36" / 60 mm

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

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 161,515 shp / 120,490 Kw = 30.00 kts
   Range 8,364nm at 18.00 kts
   Bunker at max displacement = 6,597 tons

Complement:
   1,185 - 1,541

Cost:
   £6.327 million / $25.307 million

Distribution of weights at normal displacement:
   Armament: 519 tons, 1.6 %
      - Guns: 519 tons, 1.6 %
   Armour: 3,885 tons, 12.3 %
      - Belts: 605 tons, 1.9 %
      - Torpedo bulkhead: 878 tons, 2.8 %
      - Armament: 118 tons, 0.4 %
      - Armour Deck: 2,028 tons, 6.4 %
      - Conning Towers: 255 tons, 0.8 %
   Machinery: 5,170 tons, 16.3 %
   Hull, fittings & equipment: 9,724 tons, 30.7 %
   Fuel, ammunition & stores: 4,632 tons, 14.6 %
   Miscellaneous weights: 7,703 tons, 24.4 %
      - Hull below water: 1,893 tons
      - Hull void weights: 200 tons
      - Hull above water: 108 tons
      - On freeboard deck: 5,280 tons
      - Above deck: 222 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     80,244 lbs / 36,398 Kg = 450.9 x 7.1 " / 180 mm shells or 11.8 torpedoes
   Stability (Unstable if below 1.00): 1.40
   Metacentric height 10.1 ft / 3.1 m
   Roll period: 14.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.08
   Seaboat quality  (Average = 1.00): 1.51

Hull form characteristics:
   Hull has low forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.648 / 0.656
   Length to Beam Ratio: 5.33 : 1
   'Natural speed' for length: 24.03 kts
   Power going to wave formation at top speed: 66 %
   Trim (Max stability = 0, Max steadiness = 100): 46
   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 %,  26.57 ft / 8.10 m,  26.57 ft / 8.10 m
      - Forward deck:   30.00 %,  42.98 ft / 13.10 m,  42.98 ft / 13.10 m
      - Aft deck:   35.00 %,  42.98 ft / 13.10 m,  42.98 ft / 13.10 m
      - Quarter deck:   15.00 %,  42.98 ft / 13.10 m,  42.98 ft / 13.10 m
      - Average freeboard:      39.70 ft / 12.10 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 115.2 %
      - Above water (accommodation/working, high = better): 330.2 %
   Waterplane Area: 47,804 Square feet or 4,441 Square metres
   Displacement factor (Displacement / loading): 135 %
   Structure weight / hull surface area: 136 lbs/sq ft or 664 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.85
      - Longitudinal: 4.05
      - Overall: 1.00
   Cramped 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

Resv

AD
52t - FC
50t - 2x LR Radio
30t - 3x SR Radio
25t - Hulesmeyer
25t - Night Fighting
40t - 2x 20t Squadron Plot Rooms.

OD
5280 - Airgroup, 66 total

HAW
27t - CO2 Compressor AC
54t - Fume extraction fans
27t - Additional Fire Ext



HBW
1269 Turbogenerators
200    Additional Av Gas dble wall tank
20t   Additional Fix Ext for Av Gas
200   Additional Bombs/ Torps
28t   Additional Pumps
176  Torpedo Net







Desired :
16 Fighters + 4 flying spares
16 Scouts + 4 flying spares
16 Strikers + 4 flying spares
---
+6 non flying spares
---
66 total

* 80t = 5280t
Double hanger : 3630m2
Single hanger : 4290m2



Decks
+13.1  Landing Deck
+10.6 
+8.1    Flying Off Deck
+5.6   
+3.10  Battery Deck
+0.60  Crown Protective Deck, Top TDS
-1.90  Bottom Protective Deck
-4.40 1st Deck
-6.90 Engineering
-7.99  Double Bottom
-8.33  Keel

[The Rock Doctor]

It's a big carrier by 1920s standards.  Belt may need some length added?

I'd agree that you don't need to sim the refurb.  I'm doing some tweaking of armament in my ship, so I'll be posting one.

[Kaiser Kirk]

It's a big carrier by 1920s standards.  Belt may need some length added?

Weird on the belt, but I was trying different lengths.

I think it's "Too Big" actually.
I don't want to 'pay' that much.

This kinda takes guidance from Amagi,
so you see the heavy secondary.

The driving force for the big carriers seems to have been the availability of the battleship/cruiser hulls for conversion.
So that might not be reasonable here.

[The Rock Doctor]

I could see the inspiration from the big BC conversions, and I like the description of the layout. 

It's not to say you can't or shouldn't, just that outside the stock of big hulls for conversion, the early purpose-built stuff was smaller.  Maybe this is something that becomes an obvious want after the flight-deck cruisers have been in service for a year or two.

[Kaiser Kirk]

I think you're right, it's not very evolutionary, and going up that big is a bit of a leap.

I think the Flight Deck Cruisers will fit the current need well, and are more affordable.
I can have one with each fleet and with the scouting groups.

The appeal of a strike carrier is  a great way to slow down faster enemy ships, so the sledgehammer of the battleline can close. Its also a wide ranging threat against supply and amphibious vessels.

However, those Flight Deck Cruisers could be used to offload their fighters and load up torpedo bombers, to more flexibly provide that option.

So get the FDCs in service a little, and discover that it might be nice to have a strike carrier.
Plus I might have the next tech by that point and be able to fly off bigger groups.

[Jefgte]

The feedback from the first carriers does not justify building such large ships for 1925.
Byzantium budgeted 2 x 12 000t (max) carriers for 1925-1926.

Akagi-Lexington are not a good benchmark for our history, but Furious, yes.

...I can have one with each fleet and with the scouting groups...

I agree.

[Kaiser Kirk]

So taking another try at the 'Strike Carrier'.

Conceptually these are still 'Glorious' with the flying off deck, but with a twin island linked by a flying bridge.
Like the original idea for Hermes, the final crash barrier would be a net hung between.

Looking at Honsho and Hermes, they were both 25knots, and many of the battleship conversions were slow as well,
wind over deck does not demand high speed for these early carriers.

The design role I'm considering for this is a carrier to sit behind the battleline, and as scouting reports come in,
launch a fighter sweep followed by a flight of torpedo bombers.
Just one torpedo hit should .. 'adjust' the speed of enemy ships, helping solve the 'slow' part of the Parthian line.

Since the ship will have to turn with the wind, then catch up to the line, a higher cruise speed is given than
the line's.

Still a larger vessel than I wanted, I realized my push to build buffers into the air group
to account for planes out of service, and just the uncertainty of exact planning at this early time,
meant I was planning for an air group much much larger than what was intended as the combat loadout.

I also have a TDS, a protective deck with 100mm slopes and 60mm crown, a heavy secondary, etc.

Conceptually these are still 'Glorious' but with a twin island linked by a flying bridge.
Like the original idea for Hermes, the final crash barrier would be a net hung between.

More blathering in the notes section.

Desert Wind, Parthia Strike Carrier laid down 1926

Displacement:
   15,500 t light; 16,115 t standard; 18,150 t normal; 19,778 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (524.93 ft / 518.37 ft) x 75.46 ft x (27.07 / 29.06 ft)
   (160.00 m / 158.00 m) x 23.00 m  x (8.25 / 8.86 m)

Armament:
      12 - 6.50" / 165 mm 43.0 cal guns - 143.30lbs / 65.00kg shells, 200 per gun
     Quick firing guns in casemate mounts, 1926 Model
     12 x Single mounts on sides, 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 mounts, 1926 Model
     8 x Single mounts on side ends, evenly spread
      8 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Anti-air guns in deck mounts, 1926 Model
     8 x Single mounts on sides, evenly spread
      16 - 0.59" / 15.0 mm 70.0 cal guns - 0.12lbs / 0.05kg shells, 150 per gun
     Machine guns in deck mounts, 1926 Model
     4 x Twin mounts on sides, evenly spread
      4 raised mounts
     4 x Twin mounts on sides, evenly spread
      4 double raised mounts
      Weight of broadside 1,968 lbs / 893 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.57" / 40 mm   336.94 ft / 102.70 m   12.01 ft / 3.66 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.50" / 38 mm   336.94 ft / 102.70 m   25.56 ft / 7.79 m
   Beam between torpedo bulkheads 52.49 ft / 16.00 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:   0.31" / 8 mm   0.31" / 8 mm      0.31" / 8 mm
   2nd:   0.31" / 8 mm         -               -
   3rd:   0.31" / 8 mm         -               -
   4th:   0.31" / 8 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 2.36" / 60 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 2.36" / 60 mm

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 83,148 shp / 62,028 Kw = 28.00 kts
   Range 9,066nm at 16.00 kts
   Bunker at max displacement = 3,663 tons

Complement:
   781 - 1,016

Cost:
   £3.461 million / $13.844 million

Distribution of weights at normal displacement:
   Armament: 314 tons, 1.7 %
      - Guns: 314 tons, 1.7 %
   Armour: 2,079 tons, 11.5 %
      - Belts: 276 tons, 1.5 %
      - Torpedo bulkhead: 477 tons, 2.6 %
      - Armament: 25 tons, 0.1 %
      - Armour Deck: 1,214 tons, 6.7 %
      - Conning Towers: 88 tons, 0.5 %
   Machinery: 2,662 tons, 14.7 %
   Hull, fittings & equipment: 6,128 tons, 33.8 %
   Fuel, ammunition & stores: 2,650 tons, 14.6 %
   Miscellaneous weights: 4,317 tons, 23.8 %
      - Hull below water: 156 tons
      - Hull void weights: 50 tons
      - Hull above water: 1,984 tons
      - On freeboard deck: 1,975 tons
      - Above deck: 152 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     41,837 lbs / 18,977 Kg = 305.2 x 6.5 " / 165 mm shells or 5.5 torpedoes
   Stability (Unstable if below 1.00): 1.15
   Metacentric height 4.2 ft / 1.3 m
   Roll period: 15.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.20
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has low forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.609
   Length to Beam Ratio: 6.87 : 1
   'Natural speed' for length: 22.77 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 13.00 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 %,  25.26 ft / 7.70 m,  25.26 ft / 7.70 m
      - Forward deck:   30.00 %,  41.67 ft / 12.70 m,  41.67 ft / 12.70 m
      - Aft deck:   35.00 %,  41.67 ft / 12.70 m,  41.67 ft / 12.70 m
      - Quarter deck:   15.00 %,  41.67 ft / 12.70 m,  41.67 ft / 12.70 m
      - Average freeboard:      38.39 ft / 11.70 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 96.1 %
      - Above water (accommodation/working, high = better): 290.7 %
   Waterplane Area: 28,609 Square feet or 2,658 Square metres
   Displacement factor (Displacement / loading): 145 %
   Structure weight / hull surface area: 104 lbs/sq ft or 507 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.79
      - Longitudinal: 8.12
      - 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

Intended to look like a twin-superstructure Glorious class.

Strike Carrier intended to wait for aerial scouting reports,
and launch first a fighter sweep, then a flight of torpedo bombers.

The Strike carrier is not a scouting unit, or fighter defense, but battle line support unit.

Airgroup : 4 planes per Talon, 16 planes per Flight, +1 flying spare/talon.

16 fighter, 25% flying spares = 20
16 torpedo bombers , 25% flying spares = 20
+2 / stored per flight : 4
"10% planning buffer" : 4
---
Airgroup of 32 planned
Provision for 48 planes
Room for growth/adjustments

48 * 80 = 3840t = 1920 OD/1920 HAW
48 * 55 (dbl hanger) = 2640m2 needed
12.0m deck height for double hanger.
Bow 5m below final deck for flying off deck.
12.7 & 7.5 used.

Featuring the Parthian 'H' shaped two-islands joined by a flying bridge.

Forward of this, planes can take off, or be catapulted with 2 deck catapults forward.

The 'final' crash barrier of a net can be strung between the superstructures, and an elevator is right behind them, allowing landing activities there.

The second elevator is at the 'rear' of the upper flight deck.

Two hangers are provided, with the roof of the 2nd the upper flight deck, and the roof of the first leading to the flying off deck.

This arrangement is expected to allow the ship to surge fighters if needed, while the heavier torpedo bombers will be spotted at the rear of the upper deck.

....one can presume going through the 'tunnel' of the H structure
will not be the happiest part of the take off run.


The main threat is expected to be either submarines, or surface raiders at night or in inclement weather.  Surface raiders would be expected to be light high speed units.

The 100mm protective deck slopes & 60mm crown should defeat most shells from such, while the 165mm QF should be effective against such ships at closer ranges of bad weather or night.

Speed to support the battleline is 20 knots, or 26 for the faster Stormbringer class.

As she will have to steam with the wind, then catch up with the battleline, a higher cruise speed of 16knots is given.

An additional 2 knots moves the carrier into cruiser range, meaning that if caught by a surface raider, the ship can run for the battleline and force a long stern chase. But this would also take ~16,800 tons. Likewise, moving up to 165mm would

Misc Wt : *
Reserve : 50t

AD :
32t - FC
50t - LR Radios
20t - 3 SR Radios
25t - Hulesmeyer
25t - Searchlights (NF)
100t- Superstructure

OD :
1920 : 24 planes
5t : Paravanes
16t : Add Fire Ext
50t : 2 forward hydraulic catapults

HAW :
1920 : 24 planes
16t : CO2 compressor AC
32t : Forced exhaust fans.
16t : Add Fire Ext
50t : 2 forward hydraulic catapults

HBW :
50t : Additional Avgas 45t in 5t Double wall tank
10t : Additional Fire Suppresion Av Gas
80t : Additional Weapons stores
16t : Additional pumps.

*for misc weights, I use 1:1,000tons for many which should scale with the ship, and 25t for more fixed installations for which I really don't know.

[Kaiser Kirk]

This is an update of a 1918 update of a 1913 update of my 1890s Dragonfly river gunboat.
It's an recurring idea that I keep having and feel a need for, and fail to budget for.
Since Rocky was asking, I figured I'd share.

At it's core, it's a casement ironclad...updated.

Compared to a 1920s tank, it's well armored and heavily gunned.
A QF 57mm vs. a 1920s tank is a colossal mismatch, esp paired with
a stable fire control system.

Further, a vessel this size would be extremely hard to 'kill' with weapons intrinsic to a
infantry unit. Anti-tank weapons would make too small a hole for such a large vessel,
while artillery would lack the shell types, unless specially brought along.

Dragonfly II, Parthian Rivirine Gunboat laid down 1926

Displacement:
   251 t light; 285 t standard; 291 t normal; 296 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (161.74 ft / 157.48 ft) x 26.25 ft x (4.00 / 4.06 ft)
   (49.30 m / 48.00 m) x 8.00 m  x (1.22 / 1.24 m)

Armament:
      1 - 4.72" / 120 mm 43.0 cal gun - 55.12lbs / 25.00kg shells, 200 per gun
     Quick firing gun in casemate mount, 1926 Model
     1 x Single mount on centreline, forward deck forward
      1 - 4.65" / 118 mm 21.0 cal gun - 55.12lbs / 25.00kg shells, 300 per gun
     Breech loading gun in deck mount, 1926 Model
     1 x Single mount on centreline, aft deck aft
      4 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Quick firing guns in casemate mounts, 1926 Model
     4 x Twin mounts on sides, evenly spread
      8 - 0.59" / 15.0 mm 70.0 cal guns - 0.12lbs / 0.05kg shells, 5,000 per gun
     Quick firing guns in casemate mounts, 1926 Model
     4 x Single mounts on side ends, evenly spread
      4 - 0.59" / 15.0 mm 70.0 cal guns - 0.12lbs / 0.05kg shells, 5,000 per gun
     Anti-air guns in deck and hoist mount, 1926 Model
     1 x 2 row quad mount on centreline, forward deck aft
      1 double raised mount
      Weight of broadside 138 lbs / 63 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   0.79" / 20 mm     62.99 ft / 19.20 m   6.23 ft / 1.90 m
   Ends:   0.59" / 15 mm     94.46 ft / 28.79 m   6.23 ft / 1.90 m
   Upper:   0.79" / 20 mm     62.99 ft / 19.20 m   9.19 ft / 2.80 m
     Main Belt covers 62 % of normal length

   - 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:   0.79" / 20 mm   0.59" / 15 mm            -
   2nd:   0.79" / 20 mm   0.59" / 15 mm            -
   3rd:   0.59" / 15 mm   0.31" / 8 mm            -
   4th:   0.31" / 8 mm   0.31" / 8 mm            -
   5th:   0.31" / 8 mm   0.31" / 8 mm            -

   - Armoured deck - multiple decks:
   For and Aft decks: 0.39" / 10 mm
   Forecastle: 0.31" / 8 mm  Quarter deck: 0.31" / 8 mm

   - Conning towers: Forward 0.79" / 20 mm, Aft 0.79" / 20 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 138 shp / 103 Kw = 9.00 kts
   Range 2,000nm at 6.00 kts
   Bunker at max displacement = 11 tons (23% coal)

Complement:
   34 - 45

Cost:
   £0.052 million / $0.209 million

Distribution of weights at normal displacement:
   Armament: 19 tons, 6.4 %
      - Guns: 19 tons, 6.4 %
   Armour: 100 tons, 34.2 %
      - Belts: 51 tons, 17.7 %
      - Armament: 26 tons, 8.9 %
      - Armour Deck: 21 tons, 7.1 %
      - Conning Towers: 1 tons, 0.5 %
   Machinery: 4 tons, 1.5 %
   Hull, fittings & equipment: 120 tons, 41.4 %
   Fuel, ammunition & stores: 40 tons, 13.7 %
   Miscellaneous weights: 8 tons, 2.8 %
      - Hull below water: 1 tons
      - Hull void weights: 3 tons
      - On freeboard deck: 2 tons
      - Above deck: 2 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,950 lbs / 885 Kg = 37.0 x 4.7 " / 120 mm shells or 1.8 torpedoes
   Stability (Unstable if below 1.00): 1.53
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 9.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.41
   Seaboat quality  (Average = 1.00): 1.40

Hull form characteristics:
   Hull has low forecastle, low quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.616 / 0.618
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 12.55 kts
   Power going to wave formation at top speed: 28 %
   Trim (Max stability = 0, Max steadiness = 100): 36
   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:   30.00 %,  4.59 ft / 1.40 m,  4.59 ft / 1.40 m
      - Forward deck:   17.00 %,  12.80 ft / 3.90 m,  12.80 ft / 3.90 m
      - Aft deck:   23.00 %,  12.80 ft / 3.90 m,  12.80 ft / 3.90 m
      - Quarter deck:   30.00 %,  4.59 ft / 1.40 m,  4.59 ft / 1.40 m
      - Average freeboard:      7.87 ft / 2.40 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 33.6 %
      - Above water (accommodation/working, high = better): 220.0 %
   Waterplane Area: 3,068 Square feet or 285 Square metres
   Displacement factor (Displacement / loading): 170 %
   Structure weight / hull surface area: 32 lbs/sq ft or 158 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.68
      - Longitudinal: 1.87
      - Overall: 0.75
   Caution: Hull subject to strain in open-sea
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Good seaboat, rides out heavy weather easily

Warning: No. of mounts must equal No. of gun - 4th battery

The original Dragonfly class are Parthian vessels for riverine and lake use.

They are essentially center casement armor clads with heavier deck guns in "beak" casements at both ends.
The raised center casement serves as an amored deckhouse and 2nd deck, considerably boosting habitable volume.


The forward 120L43 is a conventional naval rifle in a 'beak' casement
The 118L21 is a howitzer, in an aft 'beak' casement

The twin 15mm guns are GAST twinned MGs  in roof cupolas at the corners.

The four 57mm QF are mounted at the midsection of the casement, with cutouts fore/aft.  This can fire fore/aft, or engage targets on the beam. While lacking the punch of the main guns, they allow suppressive fire totally under armor, with a small HE charge in the shell.

There is a Quad AA featuring two GAST 15mms, in an electically driven bulletproof mount on the casement roof.

The raised amidships superstructure is covered by 20mm armor and slanted back at 25 degrees (for a Cos25 O/H = 2.8m), this is  expected to defeat all small arms.

The main belt covers from +1.4 to -0.5m with 20mm armor, protecting the engines and magazines.  The ends are more lightly protected.

An armored pilot house also is the site of the rangefinder. There is an aft con for backing manuevers.


Fuel is a mix of Coal/wood w/ oil spray burning, and Oil burning
This allows the vessel to steam on local sources.

The vessel relies on an turbo-electric drive,
this allows both the power for the various mounts
and differential power to propellors for better manueverability.

Range is for 14 days.

Miscellaneous weights :

Resv : 3t

AD
2t - FC
0t - SR Radio

OD
0.25 t - CO2 Compressor AC
2t - power assist all guns

HBW
1 - Turboelectric Generator


Decks :
+3.9 Casement
+1.4  1st Deck
-1.15   Engineering deck.