Parthian Ships 1928 +

[Kaiser Kirk]

If 26 knots works for you, it seems like the Parthian way to go.

It does, the logic that made it suitable for the Stormbringer and the envisioned role is still there.
Pouring through folks ships again underlines that 27-28 knots buys a little,
but the heavies faster than that, shouldn't fare well against these.

The 10 guns, two volleys of 5, does fall into the optimal firepower / firecontrol bracket.
And frankly the more guns I have the better chance to hit and smash something important.
The armor is less than desired, but still more than anyone else for the magazines.

I think I'm struggling to decide as there seems to be a disconnect between what I want and what I can achieve.
I really liked the 380mm inclined belt, 140mm deck + mag box of the first 10x365 ship posted.
Compared to HMS Nelson - the only historical battleship in this period to serve as a 'reasonable' guide,
the protection on these 390s is reasonable, but not excessive. I kinda like excessive....

I'd like to feature 12x390 in 4T3
and if I could have that and the armor and say 29 knots
all for 38,000 tons....that would be nice.

[TacCovert4]

I'm going to have to start looking at this mag box plus main deck and belt setup.   Especially as I go towards my next gen of large battleships.

[Kaiser Kirk]

I'm going to have to start looking at this mag box plus main deck and belt setup.   Especially as I go towards my next gen of large battleships.

SS has no mechanism for a thicker deck over the magazines vs machinery like many navies had.
Classes like the KGV, which had no armor behind the belt or below the deck - real AON- get critiqued for no protection against ejecta from partial pens, blast effects, etc.
The American Armored Deck + Splinter deck works nicely as a backstop for both, but is a heavy approach, and my main concern is a little extra on the magazines.

A full splinter deck that way does cap the height of the TDS system, which limits the expansion volume, so I like to extend my TDS to the armor deck, above waterline.
The space for that would greatly reduce the area covered by the splinter deck, and leave vertical channels on each side with no such deck. So the Armored multi-layer deck does not work.
That TDS arrangement gives behind the belt splinter protection....but does not effect the vertical....which there is no toggle for in SS.
So the Magazine box seemed like the best way to model that and should add even more horizontal protection.
Basically no golden twinkie shots.

[TacCovert4]

Makes sense. I do run a shorter TDS than you, which allows me to run the splinter deck arrangement.  And my TDS on my larger ships is thick enough to be very good splinter protection for shots that pen the belt, so in a way my most modern BBs have two boxes of protection before you're intruding into the explosive and required buoyancy spaces.

But on something like the Razees, this makes more sense than having a splinter deck, which is a minimum of 20mm to be able to stop spalling or partial pen splinters.  Instead having a box around the magazines would drastically improve their protection and let me run potentially a thicker main deck that can resist more fire anyway.

[Kaiser Kirk]

I've gone from an upper armored deck and a main protective deck, to the AON thick armor deck, to starting to introduce these magazine boxes - I think on the Kalifern class but I'd have to check.

I guess I'll have to wait for a battlewagon with halfway decent side and deck armor for my Imulhu & Asi class, but that's several years off, and I need to extend docks for that.

[Kaiser Kirk]

With the Gilgamesh refurbishments done, the Enki class is next.

The Enki class was a close follow on to the Gilgamesh and was intended to be a more economical vessel, but the small savings were not seen generally worth it.

The original design was turbines, which means they can be replaced with turbines.
Consideration was given to 23 knots, which would be +2 over the Byzantine battleline. However the expectation is these ships to operate with other 20 knot ships, making the utility of having just 2 ships just slightly faster was dubious.
Especially as the addition 600 tons for the engines came out of the armor budget.

The Enkis had a massive 165mm secondary, mixing deck mounts and casements. The casements are low off the water and very wet.

In this, the deck mount & hoist are replaced with twin 130mm to engage destroyers. The Casements are plated over. The Parthians have far better screens against destroyers and cruisers and don't feel the marginal value of the casement guns is worth the flooding potential when listing.

Enki -1929 Refurbishment, Parthian Dreadnaught laid down 1907 (Engine 1928)

Displacement:
   22,075 t light; 23,550 t standard; 24,648 t normal; 25,527 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (548.20 ft / 541.34 ft) x 88.58 ft (Bulges 98.43 ft) x (28.71 / 29.61 ft)
   (167.09 m / 165.00 m) x 27.00 m (Bulges 30.00 m)  x (8.75 / 9.03 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, 1925 Model
     5 x Twin mounts on centreline, evenly spread
      2 raised mounts
      16 - 5.12" / 130 mm 50.0 cal guns - 70.55lbs / 32.00kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1925 Model
     8 x 2-gun mounts on side ends, evenly spread
      4 raised mounts - superfiring
      16 - 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, 1925 Model
     6 x 2-gun mounts on sides, evenly spread
      6 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, 1925 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 14,857 lbs / 6,739 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   14.0" / 355 mm   351.87 ft / 107.25 m   9.84 ft / 3.00 m
   Ends:   1.57" / 40 mm   189.44 ft / 57.74 m   9.84 ft / 3.00 m
   Upper:   5.31" / 135 mm   319.06 ft / 97.25 m   6.56 ft / 2.00 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.50" / 38 mm   351.87 ft / 107.25 m   26.57 ft / 8.10 m
   Beam between torpedo bulkheads 68.90 ft / 21.00 m

   - Hull Bulges:
      0.35" / 9 mm   351.87 ft / 107.25 m   24.61 ft / 7.50 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   15.0" / 380 mm   7.09" / 180 mm      14.0" / 355 mm
   2nd:   2.95" / 75 mm   1.57" / 40 mm      1.97" / 50 mm
   3rd:   0.59" / 15 mm   0.31" / 8 mm      0.31" / 8 mm
   4th:   0.59" / 15 mm         -               -

   - Protected deck - multiple decks:
   For and Aft decks: 5.31" / 135 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 2.17" / 55 mm

   - Conning towers: Forward 13.98" / 355 mm, Aft 1.57" / 40 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 26,398 shp / 19,693 Kw = 20.00 kts
   Range 5,365nm at 14.00 kts
   Bunker at max displacement = 1,977 tons

Complement:
   983 - 1,278

Cost:
   £2.034 million / $8.138 million

Distribution of weights at normal displacement:
   Armament: 2,292 tons, 9.3 %
      - Guns: 2,292 tons, 9.3 %
   Armour: 9,186 tons, 37.3 %
      - Belts: 2,724 tons, 11.1 %
      - Torpedo bulkhead: 518 tons, 2.1 %
      - Bulges: 114 tons, 0.5 %
      - Armament: 2,623 tons, 10.6 %
      - Armour Deck: 2,924 tons, 11.9 %
      - Conning Towers: 284 tons, 1.2 %
   Machinery: 822 tons, 3.3 %
   Hull, fittings & equipment: 8,955 tons, 36.3 %
   Fuel, ammunition & stores: 2,573 tons, 10.4 %
   Miscellaneous weights: 819 tons, 3.3 %
      - Hull below water: 215 tons
      - Bulge void weights: 140 tons
      - Hull above water: 44 tons
      - On freeboard deck: 105 tons
      - Above deck: 315 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     41,309 lbs / 18,737 Kg = 36.7 x 13.1 " / 333 mm shells or 8.2 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 5.5 ft / 1.7 m
   Roll period: 17.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.78
   Seaboat quality  (Average = 1.00): 1.56

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.564 / 0.566
   Length to Beam Ratio: 5.50 : 1
   'Natural speed' for length: 23.27 kts
   Power going to wave formation at top speed: 44 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   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:   20.00 %,  25.59 ft / 7.80 m,  23.13 ft / 7.05 m
      - Forward deck:   47.00 %,  23.13 ft / 7.05 m,  20.67 ft / 6.30 m
      - Aft deck:   18.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  12.47 ft / 3.80 m
      - Average freeboard:      18.98 ft / 5.78 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 71.8 %
      - Above water (accommodation/working, high = better): 124.9 %
   Waterplane Area: 33,909 Square feet or 3,150 Square metres
   Displacement factor (Displacement / loading): 109 %
   Structure weight / hull surface area: 200 lbs/sq ft or 974 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 1.97
      - Overall: 1.00
   Excellent 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

Original Main Guns + Mounts :  1830
Original Main Magazines 110*545 : 734
Original Engines : 1528
Original Bunkerage : 1977
Original 3m  MB : 2116
Original 3m EB : 272
Original 2m UB : 498
Original Deck : 2041

Step 1 :
Replace Main battery with  333L43, 99*605kg
Guns + Mounts : 1824t
Main mag : 734

Step 2  :
Replace engine Turbine with geared turbine : 822t
Transition to all oil, 14kts, 5365nm : 1977t
Last 15nm for Aux
True Range : 5350*1.10 = 5885nm range

Step 3:
Replace  deck 1899 165L45s
with 1925 130L50s
Delete casement 165mm.
Replace tertiary with AA
Replace magazines

Guns + mounts :  2292
New Armor :  822
Magazines : 982

Step 4
Replace End belts with 40mm : 109
Replace Aux Con with 40mm : 29
Replace Bulge with 9mm skin : 114

Step 5
Laminate additional deck armor (effective thickness)
+30mm : quarterdeck (49mm)
+30mm : main citadel deck (89mm)

Vertical protection :
Total : 135mm
Effective : 30/2 + (65 +(30*0.8)) = 104mm

Waterline Horizontal : 355+ ((65+(30*.8)* 1.5 )/2 )
= 421.75mm

Final deck armor = 2924- 2041 = 883

TDS : 4.5m deep, 38m STS
The deep 1.5m bulge on each side extends from bottom of belt to keel. The bulge is reskinned to a thinner 9mm, thought to reduce potential splinter generation.

The 3m department is divided into an outer 2m
and inner 1m wide, seperateded by a mild steel divider. Originally Coal and fuel oil, these are now
9mm || bulge ||Hull|| -void ||divider|| 2m fuel oil|| 1m void || 2x19mm STS

The inner compartment is backed by twinned 2x19mm STS, rising to the waterline.

COSTs :
Baseline : $ 22 * 0.2 = $ 4.4

Armanent & Machinery :
Armanent : 2292
Machinery :822
Subtotal : 3114
Cost : $6.228, 3.114 bp

Armor & Funct Misc Wt.
Armor : 883+114+29+109+822 = 1957
Total Misc-Reserve : 819-140 = 679
Subtotal : 2636
Cost : $2.636,  2.636 bp

Hull fittings and Equip (altered forecastle/bow):
Subtotal : 8955 /5000 = 1.791
Cost :$ 1.7191

Fuel, ammo, stores :
Ammo : 982
Fuel : 1977
NFMiscWt : 140
Subtotal : 3099/2000
Cost: $1.5495


IC cost : 1.5495 + 1.7191 + 2.636 + 6.228 + 4.4 = $ 16.5326
BP Cost : 2.636 + 3.114 = 5.75 bp

Time : (22+9)*0.25)+ (5.75/2) = 10.24mo

Cost HY : $ 8.27, 2.88 bp


Miscellaneous weight :
Reserve : 140t

AD :
230t : FC
25t : LR Radio
25t : Searchlight Tower (NF)
25t : Hulesmeyer Prox station keeping device
10t : SR Air Command Radio
0t : SR Radio

OD
5t : Paravanes
50t : 2x Fighter/Scout Floatplanes
40t : 2x Scout Floatplanes
10t : 2x Gunpowder cat

HAW
22t : CO2 compressor AC
22t : Extra Fire Suppresion

HBW
22t : Extra pumps
165t : Torpedo nets
10t : (1+9) 1t double wall tanks 9t AVGAS + Aviation supplies
5t : Fire Ext for AvGast
13t : Aux Diesel Generator, 10x1.3=13t, 244 kw
        Last 15nm range = Desel fuel.


Step 7 :
Rebuild upperhull.
+6.30  Forecastle
+3.50 Top of upper belt, 30mm protective deck.
+1.50 Top of Main Belt
+1.00 Crown of PD, 3rd Deck
-1.50 2nd deck, bottom belt, lower PD, top bulge
-4.00 1st deck
-8.10  Engineering

[Kaiser Kirk]

Apparently missed in the 1922 refits, after 6 long years of bitter and vehment protests and paperwork, oh so much paperwork, it has come to the attention of the decision making echelons...admittedly because a Mihrin (one of those Mihrins) became aware of it and spoke to a relative, who happens to be Chief of Naval Operations. That spurred a hunt for the missing paperwork, which was eventually found to have been routed to the Aral sea, which confounded the small naval station there.

Finally found, and quintuple stamped, it needed to make it into the budgetary cycle. This led to further delays as the Treasury produced a Navy statement that the needed refits had been completed. That kicked off a new series of paperwork and investigations.  These established that the work orders had been contracted, but never scheduled, and the contracts expired.

The results resulted in Treasury agreeing there may be a need, and the budget waiver request being submitted..to late for that budgetary cycle. So it was resubmitted the following year, and dropped to finance battleship reconstruction. Now, with the Gilgamesh finally running trials, it has been bundled with the Enki proposals.

So finally, the 1922 basic refits were scheduled, for the latter half of 1928...  if any want the full SS, I'll post it.

* Replace 4 single 90mm with 8x  90mm - superimposed gallery over the 165mm guns.
* Add 16 x 15mm in 4 quad mounts on the superstructure corners where the old 90mm were.
* Upgrade to 1918 FC.
* Dedicated SR Air band station
* Add some NF gear (more searchlights, binoc stations)
* Add Paravanes
----
0.051  Guns/mounts/armor
0.5341 total tonnage

$0.535 , 0.051 bp / Ship

1913-1928 Misc Wt.
Misc Weight :
25t - long range radio
450t - fire control 1912
140t - extra ventilation
20t - Admiral's quarters
75t - Void, Construction Reserve.

1922  Misc Wt
Reserve - 0 t

AD
452 - Fire Control 1918
25t - LR Radio
0t  - SR Radio
10t - SR radio - dedicated Air band
10t - NF gear - deck searchlights, binocs.

OD
5t - Paravanes
140t - Windcatcher evaporative cooling system

HAW:
20t - Admirals Quarters

HBW
168t - Torpedo Nets

Ok, apparently a false alarm.
My 1922 HY2 turn tracked which ships had gotten refits.
The Tiamats, Stormbringers and Vazya classes all were updated to 1918.
Just no alteration of AA.....which I should fix soon.
I should have done it already, but I am in the middle of researching a slew of 1925 tech AA guns.
...so after that
Its been a busy couple years, and I get a touch lost at times.

				Fire Ctrl	<1922	1922.0	1922.5
Class Name	Class Type	Units in Class	Light Tonnage	Tonnage
BB1-2 "Tortoise"	Battleship	2	11423	87	x
AC 9-10 Sparabara	Armored Cruiser	2	9575	78		x
BB3-4 Rohk	Battleship	2	14493	105		x
BB5-6 Simurgh	Battleship	2	17000	144			x
AC11-12 Rustam	Armored Cruiser	2	12280	92	x
BB7-10 Gilgamesh	Dreadnaught	4	22990	242.1		x
BB11-12 Enki	Dreadnaught	2	21998	242.1		x
AC 13-16 Asbara	Armored Cruiser	4	14747	110		x
BB13-14 Tiamat	1909 Dreadnaught	2	28999	450			x
BB15-16 Tiamat	1910 Dreadnaught	2	28999	450			x
BB 17-18 Stormbringer	1915 Dreadnaught	2	34116	371.1			x
BB 19-20 Vazra	1916 Dreadnaught	2	39250	2x670			x

[The Rock Doctor]

Yeah, it's a bit of a nuisance to track it all sometimes.

[Kaiser Kirk]

I felt the need to dust this off and demonstrate my 'Casement wall' concept - 3 levels of weapons.

Parthia has been trying to provide Fighter launching platforms to back the various fleets and scouts.  There is the awareness that being able to launch offensive strikes would be nice.

For that, there's a certain strike group desired, which kinda dictates the ship size.
To help fly everything off in a timely manner, a flying off deck is fitted.

But at that size, a torpedo defense belt seems needed...which makes fitting the engine power into the available space more difficult. The TDS is still a little shallow and weak, but even if it just localizes the flooding and blocks the shock wave, it is seen as helpful.

For Anti-surface work, if such comes to pass, the expectation that it will be at night under the glare of starshell,
so up close and personnel.  A protective deck and a ...large...number of QF guns seems adequate.

To a Parthian designer, the high beckoning sides of the carrier....seem like a terribly attractive place for gun batteries ,
thus the double-stacked casement is reintroduced....

Desert Wind, Parthia Strike Carrier laid down 1929

Displacement:
   16,000 t light; 16,701 t standard; 18,692 t normal; 20,285 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (524.93 ft / 518.37 ft) x 73.26 ft x (27.07 / 29.01 ft)
   (160.00 m / 158.00 m) x 22.33 m  x (8.25 / 8.84 m)

Armament:
      24 - 5.12" / 130 mm 50.0 cal guns - 70.55lbs / 32.00kg shells, 250 per gun
     Quick firing guns in casemate mounts, 1929 Model
     12 x Single mounts on sides, evenly spread
      12 hull mounts in casemates- Limited use in heavy seas
     12 x Single mounts on sides, evenly spread
      12 hull mounts in lower casemates- Limited use in heavy seas
      12 - 3.54" / 90.0 mm 54.0 cal guns - 24.25lbs / 11.00kg shells, 400 per gun
     Anti-air guns in deck mounts, 1929 Model
     12 x Single mounts on side ends, evenly spread
      12 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Anti-air guns in deck mounts, 1929 Model
     4 x 2-gun mounts on side ends, evenly spread
     2 x 2-gun mounts on centreline ends, evenly spread
      16 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 150 per gun
     Machine guns in deck mounts, 1929 Model
     4 x Quad mounts on sides, forward evenly spread
      4 raised mounts
     4 x Quad mounts on sides, forward evenly spread
      4 double raised mounts
      Weight of broadside 2,065 lbs / 937 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   26.54 ft / 8.09 m
   Beam between torpedo bulkheads 53.58 ft / 16.33 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, 99,261 shp / 74,049 Kw = 29.00 kts
   Range 8,922nm at 16.00 kts
   Bunker at max displacement = 3,585 tons

Complement:
   799 - 1,039

Cost:
   £4.398 million / $17.594 million

Distribution of weights at normal displacement:
   Armament: 415 tons, 2.2 %
      - Guns: 415 tons, 2.2 %
   Armour: 2,116 tons, 11.3 %
      - Belts: 275 tons, 1.5 %
      - Torpedo bulkhead: 495 tons, 2.6 %
      - Armament: 36 tons, 0.2 %
      - Armour Deck: 1,219 tons, 6.5 %
      - Conning Towers: 90 tons, 0.5 %
   Machinery: 3,049 tons, 16.3 %
   Hull, fittings & equipment: 6,074 tons, 32.5 %
   Fuel, ammunition & stores: 2,692 tons, 14.4 %
   Miscellaneous weights: 4,347 tons, 23.3 %
      - Hull below water: 156 tons
      - Hull void weights: 70 tons
      - Hull above water: 1,984 tons
      - On freeboard deck: 1,975 tons
      - Above deck: 162 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     38,372 lbs / 17,405 Kg = 572.4 x 5.1 " / 130 mm shells or 4.8 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 4.0 ft / 1.2 m
   Roll period: 15.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.21
   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): 0.636 / 0.644
   Length to Beam Ratio: 7.08 : 1
   'Natural speed' for length: 22.77 kts
   Power going to wave formation at top speed: 64 %
   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): 100.0 %
      - Above water (accommodation/working, high = better): 285.4 %
   Waterplane Area: 28,732 Square feet or 2,669 Square metres
   Displacement factor (Displacement / loading): 137 %
   Structure weight / hull surface area: 102 lbs/sq ft or 499 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.79
      - Longitudinal: 8.25
      - 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 high sides of the carrier and it's hangers are used to mount an impressive battery in stacked dual casements. These are armored with light 8mm armor to prevent flooding or fire from spreading. 

The ship still has the Parthian 'H' Tower.

H-Tower-mounted port & starboard 15mm Quad
Fore/Aft of H-Towers 15mm Quads

Deck Edge 57 & 90mm
Double stacked 130mm casements

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 130mm guns will give the carrier the abilty to rapidly engage and destroy destroyers at night. It is accepted that any such engagement would probably destroy the carrier's operational ability but if it can survive it can be repaired.

Enemy Aircraft are expected to make the carrier a priority.  Strafing by fighters or light glide bombing is expected to be a nuisance.
Paired twin 15mm address that.
High and mid altitude bombers will meet barrage fire from the 90mm,
while torpedo planes making a run will meet both 90mmm and 57mm fire.

Later, this will probably be revise to a DP armanent.

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.


Misc Wt :
Reserve : 70t

AD :
42t - 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.

Decks :
12.7  Main Flight Deck                         - Deck Edge
  7.7   Upper Hanger, Flying Off Deck  - Casements
  2.7   Lower Hanger, Battery Deck      - Lower Casements
  0.2   Protective Deck Crown 60mm , Top TDS
-2.3   Protective Deck  Lower Edge 100mm
-4.8   
-7.89 Engineering

[The Rock Doctor]

I dunno, think it needs more guns.

[TacCovert4]

I'm a bit ambivalent.  It's got a LOT of guns.  But with a protected deck and basically everything important outside of machinery and magazines above that deck, is this a ship that is ever going to willingly get into a gunfight whatsoever?  I'd cut your number of guns and increase speed, aircraft, or protection.  A carrier without an armored hangar/flight deck so much as gets in a gun duel with a DD, she's going to lose planes and need to take several hours of DC to get her hangars and flight deck back into action just from superstructure hits alone. 

[Kaiser Kirk]

Willingly ? No no no no.
Its not a Flight Deck Cruiser. Even those the guns are for backup.
And you are completely correct, anytime you're in QF shell range, you're going to see your air assets pick up all sorts of holes which render that useless.

The thought is that as night falls, or in sea hazes, light rains, and the various situations which dramatically cut sightlines but allow smaller ships high speed -
squadrons of enemy destroyers or cruisers may raid behind the front lines.  I believe that is how the USN lost carriers to surface raiders in exercises. I expect Parthia's finding the same.
I have a cruiser I'm eying intended for that.

At that point, by time you see them, you're in range, it's too late to get up to speed and outrun them - if you can* - so your precious carrier is suddenly in a knife fight
with probably a destroyer or standard cruiser.

So lots of shells to quickly hit, degrade, and destroy that foe is the best way to keep the carrier from sinking.
As long as it's still afloat, it's repairable.

Plus, I'm working on the 'Primitive DP secondary batteries', finish 1929.0,  so down the road I can replace those 130s with DP 120s.
Right now, I can't even start researching those mountings but I should have an idea they are more complex, take more space and weight and and you need things like an automatic fuse setter.
So..start with the larger gun and downsize later.
Which should give a very nice barrage vs. Torpedo planes once refitted.


*Given how folks push speeds, ships relying on it rarely stay the fastest for long. On the other hand, carriers have massive freeboards.

As for Rocky's comment - More Guns?
I thought I had enough...silly me.
I suppose I could do that, just slim the protective deck to get a bit of tonnage.

[Kaiser Kirk]

Thinking on the Casement Monster (tm)*
1929.0 - finish primitive DP
1929.5 & 1930.0 - develop a 1920 gun tech 120L43 DP Mounting.

I could lay this** down in 1930.5 with the 120mm DP in the Casements to start.
The weight might free up enough for the 90s to upgrade to 120 DP as well.
Enterprise had 8x single 127s in deck edge galleries, so weight wise that's not a problem.

Giving 36 x DP 120mm, 18 on each beam
As Rocky pointed out, a little undergunned...but might have to do.
It should be formidable against incoming torpedo bombers.

I should toy with 1931, but I doubt the change in engine year would be important.

* Registered Trademark, Parthian Navy
**I will probably look at a longer slimmer version as well.

[The Rock Doctor]

I've been assuming we need to research new guns, not just new mountings, so we might need to pin down expectations there.

I'm coming around to visualizing this ship as an age-of-sail frigaye with double hangers on top.

[TacCovert4]

Good point on the night ops issues.  I've recognized it too, which is why all of my carriers come with full-up Night Fighting equipment.  The big 25t Capital Ship setups.  Not as a way to actually fight at night, but as a way to avoid fights at night if possible.  Plus, while my newest DDs will be NF beasts, there's a strong chance that any escort for the carriers in a war situation will wind up being second-line destroyers with my fleet DDs out doing their night attack role.  So having the carriers able to see and try to get away from threats quickly will be important.