Parthian Ships 1928 +

Kaiser Kirk · May 01, 2024, 03:01:51 PM

So this is a 1932.0 concept.

My posting in the Byzantine thread that I was resisting replacing the Vakharz class because lighter engines meant to hit the 50% weight, you need faster engines, which means more freeboard, which means a heavier/longer hull, which means more engine wt to hit 50%.

It's true. I rather like the Vakharz class, esp with the 1930 BR for AA.
The class does not excel in any way, but is capable, multirole and relatively cheap at 1140 tons.

However, if I want a modern 'low cost' destroyer, I should probably build one from scratch.
This is very similar to the Vakharz class, but 1270 tons. So only 130 more.
Same speed, range, Better main battery, good AA, good ASW.

It has a DP main battery with the new 115mm guns. Rounds per gun have been increased to provide stowage for AA rounds.

For light rapid fire weapons I've been going in ~7.5mm steps, so 7.5/15/23 (22.5)/30 / 37 (37.5)
It has a unified AA battery of 30mm. You will see the Parthians go back and forth on AA suites.
Large bore (115/120/130) for HA Bombers, and barrage fire vs torpedo bombers at range.
37mm preferred for high rate of fire and effect with good range vs. torpedo bombers.
23mm or 15mm for close in engagements. With the current torpedo release ranges and divebombings, both should be effective.
The 30mm is a bit of both and I expect the Parthians made the same evaluations that led the USN to the 28mm/1.1", which was optimized for Biplanes.

Typically I have been using 37&23 for ships that can afford split batteries with overlapping coverage, and 30mm for vessels that can only afford fewer guns for 360deg coverage.

In this case, ironically a 37 & 23mm battery weights ~0.1 tons less, so it's right on that margin, but having a unified ammunition type and simplified fire control is attractive also.

USN DDs seem to have been extremely weight tight, frequently removing guns and torpedoes, or cranes and boats, to fit other gear. So I did not leave as much misc weight reserve as I usually do,
and I expect I'll have to pull off torpedoes in the future to make any real changes.

QuoteRobah 'Fox' , Parthian Empire Destroyer laid down 1932

Displacement:
1,270 t light; 1,362 t standard; 1,522 t normal; 1,649 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(316.88 ft / 311.68 ft) x 31.17 ft x (10.17 / 10.86 ft)
(96.59 m / 95.00 m) x 9.50 m x (3.10 / 3.31 m)

Armament:
4 - 4.53" / 115 mm 47.0 cal guns - 55.12lbs / 25.00kg shells, 320 per gun
Dual purpose guns in deck mounts, 1931 Model
4 x Single mounts on centreline ends, evenly spread
2 raised mounts - superfiring
16 - 1.18" / 30.0 mm 80.0 cal guns - 0.95lbs / 0.43kg shells, 2,700 per gun
Anti-air guns in deck mounts, 1932 Model
2 x 2 row quad mounts on sides, forward deck aft
2 raised mounts
4 x 2-gun mounts on side ends, evenly spread
4 raised mounts
Weight of broadside 236 lbs / 107 kg

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.24" / 6 mm - -
2nd: 0.24" / 6 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 1 shaft, 32,250 shp / 24,058 Kw = 31.00 kts
Range 4,430nm at 14.00 kts
Bunker at max displacement = 287 tons

Complement:
121 - 158

Cost:
£0.739 million / $2.958 million

Distribution of weights at normal displacement:
Armament: 47 tons, 3.1 %
- Guns: 47 tons, 3.1 %
Armour: 4 tons, 0.2 %
- Armament: 4 tons, 0.2 %
Machinery: 760 tons, 50.0 %
Hull, fittings & equipment: 377 tons, 24.8 %
Fuel, ammunition & stores: 252 tons, 16.5 %
Miscellaneous weights: 82 tons, 5.4 %
- Hull below water: 25 tons
- Hull void weights: 5 tons
- Hull above water: 1 tons
- On freeboard deck: 40 tons
- Above deck: 10 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
442 lbs / 200 Kg = 9.5 x 4.5 " / 115 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 1.2 ft / 0.4 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.39
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
Hull has a flush deck,
a ram bow and a cruiser stern
Block coefficient (normal/deep): 0.539 / 0.547
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 17.65 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 70
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 19.42 ft / 5.92 m, 16.96 ft / 5.17 m
- Forward deck: 30.00 %, 16.96 ft / 5.17 m, 14.50 ft / 4.42 m
- Aft deck: 35.00 %, 14.50 ft / 4.42 m, 12.30 ft / 3.75 m
- Quarter deck: 15.00 %, 12.30 ft / 3.75 m, 12.30 ft / 3.75 m
- Average freeboard: 14.84 ft / 4.52 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 174.1 %
- Above water (accommodation/working, high = better): 148.0 %
Waterplane Area: 6,495 Square feet or 603 Square metres
Displacement factor (Displacement / loading): 72 %
Structure weight / hull surface area: 30 lbs/sq ft or 148 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.29
- Overall: 0.58
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform

With the new "Sher" class reaching 2000 tons,
a smaller vessel capable of all aspects of the destroyer role is desired

The 115mm is a good destroyer gun with decent offensive punch.

The 37mm guns are mounted 'en echelon' amid ships, on a lozenge shaped elevated platform.

The TDC is in the column holding up the platform and the torpedoes
are immediately fore and aft of that.

Basic Sonar + Enhanced Hydrophones for an ASW role

(1) DC
A(B) TT TT 'Y' (X) Y
(2) DC

Range @ Speeds :

Trial Speed is 31.74 knts
Bonus of 0.74 kts

90% power is 29025 or 30.31
75% power is 24187 or 29
50% power is 16125 or 26.36

The 4430 range with geared turbines is 5,094nm @ 14 knots
This makes the effective bunker 287 *1.15 = 330t

330 effective fuel tons
The Parthians want a reserve of 2200nm @ 10knts,
which would allow their vessels to "get to nearest base" virtually anywhere in the world.

2200nm at 10knots : 76t to "get home"

330-76 = 254

So effectively 254t are available for offensive operations,
more if "base" is close.

254t fuel with geared turbines is good for :
415nm @ 30.31knts = 13.7 hrs / 0.5 days
686nm @ 26 knots = 26.3 hrs / 1 day
1140nm @ 22 knots = 51.8 hrs / 2 days
2030nm @ 18 knots = 112.8 hrs / 4.7 days
2780nm @ 16knots = 173.7 hrs / 7 days
All in addition to 2200nm @ 10knts

Allowing the destroyer to freely operate at higher speeds for
extended periods and safely return to base.

Miscellaneous Weight

Reserve : 5t

AD
4.7t FC 1930
4.7t Night Fighting
0t Short Range Radio
1t Colored Beacons, flares, rockets for MTB leader role

OD
2t Lt. Paravanes
2t 2x 'Y' Thrower
6t 18x 280kg DC

30t 2TT5 21" 3t torpedo

HAW
1.3t - CO2 compressor AC

HBW
15t - Enhanced Hydophone package
10t - Basic Sonar

TacCovert4 · May 01, 2024, 04:07:51 PM

Quote from: Kaiser Kirk on April 30, 2024, 12:55:37 PMI generally agree.
I was curious as to other's opinions.

If I could field an 8x215 ship in 11,000tons, I likely would do it. However that would be 33% more firepower as well

Against the 8000t Parthian Royal Nissean 12x180 series, or the Byzantine 12x191mm equivalent, there is a chance it could stay at range and get enough hits through armor to offset the mission kill hits of the faster 180/191. Say 30rpm vs. 60rpm is substantial. Add in the greater spotting difficulties with 6 guns makes more difference at longer ranges, so the 'to hit' rate would suffer more.

However, it is hard to actually keep range in a 'sweet spot' favoring you and not them, and if the range closed to the point the 180/191s could punch through, all advantages are lost.

For that matter, to take advantage of that range, you need visibility to be very good to start, which
it should not always be. That consideration actually is discussed in the discussion of USS Brooklyn's design evolution of 6" vs 8" utility.

So far, battles have happened to occur in good weather, a side effect of fighting around landing operations. There were some near misses due to night- as it's harder to find each other in the first place. Pity, the open ocean fight between the Romans and Aztecs would have been interesting.

The issue with rate of fire vs effective range is why I've stubbornly stayed with the 180mm. Enough firepower for the job, fast enough. My next gun was 280, now 240, as I think going bigger needs to get enough punch to be worth the weight. Case in point, in the pacific it was the US 6in cruisers which were particularly effective in cruiser fighting.

Jefgte · May 01, 2024, 04:21:59 PM

QuoteThe issue with rate of fire vs effective range is why I've stubbornly stayed with the 180mm. Enough firepower for the job, fast enough. My next gun was 280, now 240, as I think going bigger needs to get enough punch to be worth the weight. Case in point, in the pacific it was the US 6in cruisers which were particularly effective in cruiser fighting.

I have the same hesitation between 6M2x191 - 8 000t and 3T3x234 - 12 340t.
The fire volume for 12x191 really appeals to me and it is less expensive.

Kaiser Kirk · May 01, 2024, 04:26:00 PM

The Pouseki class is my " 6 inch" cruiser analogue, using the heavyweight 6.5" shells.
That was the key to the USN classes, the new 6" shell was heavier with a high MV and so much better penetration, and when combined with the new guns and mounts, faster firing.

The slow turning & firing 8" mounts of the early USN Heavy Cruisers also proved limiting. My Royal Nisseans with the 180s have lighter mounts with only 2 guns, not 3, so hopefully do not experience the same problem. I did develop 3 and 4 gun mountings, but figured testing found they did not meet specs.

In my Xiyon class the heavyweight 8.5" shell is, like the preceeding 255, expected to penetrate cruiser armor schemes at pretty much any range. The 'if I can see a cruiser, I can kill it' is the goal for the AC level ships, and wasn't really doable on a smaller gun until I had the 1925 tech.

Kaiser Kirk · May 03, 2024, 11:34:24 PM

Something of a trivial bit:
I've posted the Sher (Lion) and the Robah (Fox) Classes previously.
As a continuation of the Wolf class, a canid seemed appropriate for the Robah.
But foxes are not really pack hunters or big cats, might be a good name for a small/fast coastal destroyer. Torag (Jackle) was considered, villagers use them as guard dogs in what is Parthia.

Having done more digging,
I think I will rename the Robah to sīāhgūš, or 'Siahgus' class, meaning Caracal. A long-legged Lynx type cat.

Both Cheetahs (Yoz) and Caracals (Saihgus) were trained for hunting.
The Cheetahs were larger and could hunt greater games, and I'm reserving that
name for a fast offensive destroyer, but a Caracal hunted smaller game. I think that's a very apt name for a smaller destroyer hunting submarines and aircraft.

Another option would be to call it the Lynx, which I wanted, but
could be Vasag, but seems like it as Asaq or pelang-e mul 'Leopards bastard'.

Anyhow, Saihgus seems an appropriate choice.

Kaiser Kirk · June 22, 2024, 12:14:23 AM

And now for something completely different...

Enter ship name, Enter country Enter ship type laid down 1934

Displacement:
   953 t light; 979 t standard; 1,006 t normal; 1,028 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (164.04 ft / 164.04 ft) x 32.81 ft x (8.73 / 8.90 ft)
   (50.00 m / 50.00 m) x 10.00 m x (2.66 / 2.71 m)

Armament:
2 - 2.36" / 60.0 mm 60.0 cal guns - 7.21lbs / 3.27kg shells, 400 per gun
     Quick firing guns in deck mount, 1934 Model
     1 x 2-gun mount on centreline forward
4 - 1.18" / 30.0 mm 80.0 cal guns - 0.95lbs / 0.43kg shells, 1,200 per gun
     Anti-air guns in deck mounts, 1934 Model
     4 x Single mounts on side ends, evenly spread
Weight of broadside 18 lbs / 8 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.59" / 15 mm     -           -
   2nd:   0.59" / 15 mm     -           -

- Box over machinery & magazines:
   0.31" / 8 mm

- Conning towers: Forward 0.59" / 15 mm, Aft 0.00" / 0 mm

Machinery:
   Diesel Internal combustion motors,
   Hydraulic drive, 2 shafts, 1,015 shp / 757 Kw = 12.66 kts
   Range 1,680nm at 10.00 kts
   Bunker at max displacement = 49 tons

Complement:
   89 - 116

Cost:
   £0.191 million / $0.766 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 0.6 %
     - Guns: 6 tons, 0.6 %
   Armour: 11 tons, 1.1 %
     - Armament: 4 tons, 0.4 %
     - Armour Deck: 6 tons, 0.6 %
     - Conning Tower: 1 tons, 0.1 %
   Machinery: 29 tons, 2.9 %
   Hull, fittings & equipment: 224 tons, 22.3 %
   Fuel, ammunition & stores: 53 tons, 5.3 %
   Miscellaneous weights: 683 tons, 67.9 %
     - Hull below water: 12 tons
     - Hull void weights: 5 tons
     - Hull above water: 128 tons
     - On freeboard deck: 537 tons
     - Above deck: 1 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,853 lbs / 1,747 Kg = 584.6 x 2.4 " / 60 mm shells or 2.7 torpedoes
   Stability (Unstable if below 1.00): 1.07
   Metacentric height 1.1 ft / 0.3 m
   Roll period: 13.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality (Average = 1.00): 1.48

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.750 / 0.752
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 12.81 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 48
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   17.50 %, 14.11 ft / 4.30 m, 9.19 ft / 2.80 m
     - Forward deck:   32.50 %, 9.19 ft / 2.80 m, 8.20 ft / 2.50 m
     - Aft deck:   32.50 %, 8.20 ft / 2.50 m, 8.20 ft / 2.50 m
     - Quarter deck:   17.50 %, 8.20 ft / 2.50 m, 8.20 ft / 2.50 m
     - Average freeboard:      8.88 ft / 2.71 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 28.0 %
      - Above water (accommodation/working, high = better): 81.5 %
   Waterplane Area: 4,508 Square feet or 419 Square metres
   Displacement factor (Displacement / loading): 131 %
   Structure weight / hull surface area: 37 lbs/sq ft or 180 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.22
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Warning: Beam between bulkheads too wide

AUX Tender - Fleet Supply 512t = 5,120tons supported.

Designed as a self-propelled barge
1 week of fuel at cruise speed is provided.
Due to diesel fuel & hydraulic drives true range
is 1680*1.8 = 3,024

A single deck space below water is provided.
A single enclosed deck above water is provided.

Normal displacement is 1,006, so 2% is 20tons
Twin 60mm are meant to fight light combatants (mtbs/subs),
while 30mm are meant to ward off aircraft.
Fire Control is fitted.
The only armor is bulletproofing against strafing and shore fire.

Conceptually the craft can be fitted for cargo transport or troop transport. The light superstructure is cavernous, and can hold either. The primary purpose is cargo transport.

The shallow draft allows for the vessel to ascend rivers, or land over beaches, allowing it to be used as a combat transport if necessary. The draft also makes the vessel very hard to torpedo without torpedo breaching in wave troughs.

The vessel can be built in a 50m dock, the smallest standard in the Parthian Empire. Built in 10 months, launchable in 4 months, the dock shall clear in +1 month.

Drydock Length : # built / dock
50 : 1
110 : 2
170 : 3
230 : 4
290 : 5

Misc Wt
1t - FC 1930
0t - SR Radio

OD : 560t
25t : Crane
512t : Cargo (Fleet Support Value)

(Basic Refit needed to make suitable for 128 troops)

HAW :
128t : Quarters 32 Marines/Passengers

HBW :

9t - Diesel Engine
3t - Hydraulic Drive

The Rock Doctor · June 22, 2024, 07:48:02 AM

I like it. Handy little vessel.

Kaiser Kirk · June 25, 2024, 11:41:59 PM

The preceeding barge has a great deal of promise, and enough capacity to be clearly useful.
But I wanted to explore the lower limit.
Enter ship name, Enter country light barge laid down 1934

Displacement:
   198 t light; 206 t standard; 212 t normal; 217 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (65.62 ft / 65.62 ft) x 16.40 ft x (9.19 / 9.37 ft)
   (20.00 m / 20.00 m) x 5.00 m x (2.80 / 2.86 m)

Armament:
2 - 1.46" / 37.0 mm 70.0 cal guns - 1.72lbs / 0.78kg shells, 2,000 per gun
     Dual purpose guns in deck mounts, 1934 Model
     2 x Single mounts on centreline ends, evenly spread
Weight of broadside 3 lbs / 2 kg

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

- Conning towers: Forward 0.31" / 8 mm, Aft 0.00" / 0 mm

Machinery:
   Diesel Internal combustion generators,
   Electric motors, 2 shafts, 398 shp / 297 Kw = 11.33 kts
   Range 1,334nm at 8.00 kts
   Bunker at max displacement = 11 tons

Complement:
   27 - 36

Cost:
   £0.044 million / $0.174 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.7 %
     - Guns: 2 tons, 0.7 %
   Armour: 2 tons, 0.9 %
     - Armament: 2 tons, 0.7 %
     - Conning Tower: 0 tons, 0.1 %
   Machinery: 11 tons, 5.4 %
   Hull, fittings & equipment: 40 tons, 18.7 %
   Fuel, ammunition & stores: 14 tons, 6.6 %
   Miscellaneous weights: 144 tons, 67.7 %
     - Hull below water: 50 tons
     - Hull void weights: 5 tons
     - Hull above water: 44 tons
     - On freeboard deck: 44 tons
     - Above deck: 0 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     301 lbs / 136 Kg = 194.6 x 1.5 " / 37 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.01
   Metacentric height 0.3 ft / 0.1 m
   Roll period: 11.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.03
   Seaboat quality (Average = 1.00): 1.14

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.750 / 0.752
   Length to Beam Ratio: 4.00 : 1
   'Natural speed' for length: 8.10 kts
   Power going to wave formation at top speed: 76 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   17.50 %, 8.92 ft / 2.72 m, 8.04 ft / 2.45 m
     - Forward deck:   32.50 %, 8.04 ft / 2.45 m, 8.04 ft / 2.45 m
     - Aft deck:   32.50 %, 8.04 ft / 2.45 m, 8.04 ft / 2.45 m
     - Quarter deck:   17.50 %, 8.04 ft / 2.45 m, 8.04 ft / 2.45 m
     - Average freeboard:      8.10 ft / 2.47 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 70.0 %
      - Above water (accommodation/working, high = better): 51.1 %
   Waterplane Area: 902 Square feet or 84 Square metres
   Displacement factor (Displacement / loading): 123 %
   Structure weight / hull surface area: 21 lbs/sq ft or 103 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.73
      - Longitudinal: 17.04
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Cramped accommodation and workspace room

Warning: Beam between bulkheads too wide

A light barge for coastal use.
Wanted to explore the concept
Not entirely sure how it would be used.
But could be a cheap and easy storyline
matter.

2 can be built per 50m dock
$ 0.0495, 0.0495

132t Cargo or 132t Fleet Supply (1320t = 33mtb/ 2 x 500t Subs) or 38 troops fully geared.

0.2- 1930 FC
0 - SR Radio

OD
44 - cargo

HAW
44 - Cargo

HBW
44 - cargo
3 - Electric drive drive
3.3 - Diesel Engine

2.45 Weather deck.
-0.10 1st Platform Deck
-2.75 Engineering

Kaiser Kirk · July 04, 2024, 09:31:31 PM

I've been planning big carriers since about 1926. At which time opinion was to big.
Which I agreed with.

I felt my early priority was fighter launch platforms, followed by scout platforms.
So I have a variety of relatively small carriers and seaplane cruisers.
Their combined launch rate should far exceed any one carrier,
while the number of decks provides insurance against 1 hit destroying my fighter cover.
I even built a dedicated training carrier as acknowledgement that

I was really hoping to lay down a larger carrier in 1931, but that didn't happen.
All those fleet AA/FC refits, and refurbishments took up that spare capacity.

So I've updated the various designs for a 1933 laydown and will be posting them.
I'm inclined towards an armored carrier, but have simple flight deck options too.

The Air Point concept means that any single carrier will be overmatched, though the number of planes attacking at any one time will be closer to the capacity of a large ship. Without early warning systems, any carrier is in danger of being incapacitated or destroyed in a sudden strike.

Also, with the short range of planes, the carriers will need to be close to the line of battle, likely within 100nm* of the enemy force for a strike to launch on scout report, reach the area, find the target, engage the target and return. With much of the Empire near the Equator, 12 hours of night mean that that distance could be closed easily. This raises the prospect of surface combatants. That is a concept the Parthians are exploring offensively with the Xiyon and Pouseki classes.

*I don't think the long ranges of WWII would be expected at this design time.

Type	Name	Meaning	Tons	BP/HY	# 1933 AC	Broadside	H Armor	V Armor	Speed	Range
Flying off deck, dual hanger	Charmosh	Mythological Eagle-dog	23000	3.83	66	14 x 130L47	104	55	30	8280 @ 16
Flight deck carrier	Afson	Incantation'	27300	3.90	72	16 x 130L47	148	75	32	10254 @ 16
Flying off deck, dual hanger	Waxsendag Kaman	Burning Bow	25500	4.25	77	16 x 115L47	148	83	30	8104 @ 18
Armored Carrier	Gurdihskarag	Armored Bird of Prey	27000	4.50	66	16 x 115L47	137	83	30.5	8080 @ 16
Flying off deck, Armored Carrier	Baskuc	Gryphon	29000	4.15	67	16 x 115L47	128	78	31	7390@ 18

Kaiser Kirk · July 05, 2024, 03:51:21 PM

The Charmosh is the latest variation on the ship I proposed for 1926ish and folks said was to big.

I don't recall why the 130s are split into 3 battery groups instead of 2.
Doesn't seem to harm anything.

QuoteCharmosh, Parthian Strike Carrier laid down 1933

Displacement:
   23,000 t light; 24,020 t standard; 26,163 t normal; 27,877 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (623.36 ft / 613.52 ft) x 101.71 ft x (29.53 / 30.97 ft)
   (190.00 m / 187.00 m) x 31.00 m x (9.00 / 9.44 m)

Armament:
10 - 5.12" / 130 mm 47.0 cal guns - 85.98lbs / 39.00kg shells, 320 per gun
     Dual purpose guns in casemate mounts, 1929 Model
     10 x Single mounts on sides, evenly spread
      10 hull mounts in casemates- Limited use in heavy seas
10 - 5.12" / 130 mm 47.0 cal guns - 85.98lbs / 39.00kg shells, 320 per gun
     Dual purpose guns in deck and hoist mounts, 1929 Model
     10 x Single mounts on sides, evenly spread
8 - 5.12" / 130 mm 47.0 cal guns - 85.98lbs / 39.00kg shells, 320 per gun
     Dual purpose guns in deck and hoist mounts, 1929 Model
     4 x 2-gun mounts on side ends, evenly spread
16 - 1.46" / 37.0 mm 70.0 cal guns - 1.72lbs / 0.78kg shells, 2,600 per gun
     Breech loading guns in deck mounts, 1933 Model
     4 x 2 row quad mounts on side ends, evenly spread
24 - 0.91" / 23.0 mm 90.0 cal guns - 0.44lbs / 0.20kg shells, 5,000 per gun
     Breech loading guns in deck mounts, 1933 Model
     8 x Twin mounts on sides, forward evenly spread
      4 raised mounts
     4 x Twin mounts on sides, forward evenly spread
      4 double raised mounts
Weight of broadside 2,446 lbs / 1,109 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.95" / 75 mm   398.79 ft / 121.55 m   11.88 ft / 3.62 m
   Ends:   0.98" / 25 mm   214.70 ft / 65.44 m   12.01 ft / 3.66 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -15.00 degrees (positive = in)

- Torpedo Bulkhead - Additional damage containing bulkheads:
      1.57" / 40 mm   398.79 ft / 121.55 m   30.94 ft / 9.43 m
   Beam between torpedo bulkheads 82.02 ft / 25.00 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:   1.38" / 35 mm   1.38" / 35 mm      1.38" / 35 mm
   3rd:   1.38" / 35 mm   1.38" / 35 mm      1.38" / 35 mm
   4th:   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 4.72" / 120 mm, Aft 4.72" / 120 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 124,814 shp / 93,111 Kw = 30.00 kts
   Range 8,280nm at 16.00 kts
   Bunker at max displacement = 3,857 tons

Complement:
   1,028 - 1,337

Cost:
   £6.989 million / $27.957 million

Distribution of weights at normal displacement:
   Armament: 526 tons, 2.0 %
     - Guns: 526 tons, 2.0 %
   Armour: 3,408 tons, 13.0 %
     - Belts: 702 tons, 2.7 %
     - Torpedo bulkhead: 719 tons, 2.7 %
     - Armament: 216 tons, 0.8 %
     - Armour Deck: 1,593 tons, 6.1 %
     - Conning Towers: 179 tons, 0.7 %
   Machinery: 3,637 tons, 13.9 %
   Hull, fittings & equipment: 8,855 tons, 33.8 %
   Fuel, ammunition & stores: 3,163 tons, 12.1 %
   Miscellaneous weights: 6,574 tons, 25.1 %
     - Hull below water: 3,166 tons
     - Hull void weights: 390 tons
     - Hull above water: 2,709 tons
     - On freeboard deck: 68 tons
     - Above deck: 241 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     57,403 lbs / 26,038 Kg = 856.3 x 5.1 " / 130 mm shells or 7.5 torpedoes
   Stability (Unstable if below 1.00): 1.51
   Metacentric height 10.3 ft / 3.1 m
   Roll period: 13.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.12
   Seaboat quality (Average = 1.00): 1.91

Hull form characteristics:
   Hull has low forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.497 / 0.505
   Length to Beam Ratio: 6.03 : 1
   'Natural speed' for length: 24.77 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 37
   Bow angle (Positive = bow angles forward): 11.00 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 %, 22.97 ft / 7.00 m, 22.97 ft / 7.00 m
     - Forward deck:   30.00 %, 39.37 ft / 12.00 m, 39.37 ft / 12.00 m
     - Aft deck:   35.00 %, 39.37 ft / 12.00 m, 39.37 ft / 12.00 m
     - Quarter deck:   15.00 %, 39.37 ft / 12.00 m, 39.37 ft / 12.00 m
     - Average freeboard:      36.09 ft / 11.00 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 96.1 %
      - Above water (accommodation/working, high = better): 302.5 %
   Waterplane Area: 41,461 Square feet or 3,852 Square metres
   Displacement factor (Displacement / loading): 139 %
   Structure weight / hull surface area: 137 lbs/sq ft or 668 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 3.55
      - 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

Named for an mythological eagle-winged dog, which fought for good, and would swoop down and carry off the enemies of Persia.

Intended to be a 'strike' carrier,
flying off a squadron or flight of torpedo planes
after launching a sweep of fighters to clear the path.

Armanent
The carrier has deck edge 'frying pan' 130mm mounts
At the Fore/aft sections, twin mounts like the OTL British,
with the 37mm quad mounts adjacent in S1/2, S17/18

while along the citadel area, single mounts line the deck edge,
with sponson casement mounts below at the flying off deck level, but well clear of the water.

This allows the 37mms to bear directly fore/aft,
while 14 x 130mm bear on the beam.

A single Island is fitted, with 23mm mounts on it.

This allows

USS Pennsylvania had 11 casements on each side in the citadel area, on 185m, so should 'fit

Air Group
The vessel has a double hanger, the lower descending within the hull girder, the upper opening to a flying off deck.
The flying off deck ramps up slightly at the bow.

Normal operations would be focused on launching Scoutplanes,
which would be bombers with no bombload for longer range. with There would be fighters on standby. The larger airgroup will allow
2 fighter flights and a Scout-Bomber Flight.

As the planaform shows additional room suitable for planes
the concept is to trial two different approaches.

The first is the traditional, compensating for servicability rates by oversizing the flights to ensure 4 sets of 4 are always available. When more than 16 planes are flyable, the reserve pilots can tag along. This is viewed as "superior" as each lance of 4 pilots will be able to work with each other every mission.

With 4 plane 'Lances'
and 16 plane 'Flights'
and an expected 75% availability,
20 planes are needed per Flight.

1 Flight + 4 : Fighters
1 Flight + 4 : Fighters
1 Flight + 4 : Scout/Bombers
For 60 planes total.
A pair of 'utility' planes is also fitted.

The other approach is to have no "spares", and accept that most flights will take off with 12-16 planes.

For this, 4 Flights, no spares are fitted
There is the advantage that the "spares" can then be used to form a torpedo flight.

1 Flight Fighters
1 Flight Fighters
1 Flight Scout/ Bombers
1 Flight Torpedo
Total 64 planes
plus 2 utility planes.

airgroup
Raw waterplane : 3852

3636 m2 / 55 (dbl) = 66

66*80 = 5280

The last 6 are intended for flyable spares or admin uses...or something.

Superstructure
A single island structure, with 37mm positions fore/aft of it, is featured.

Guns
A battery of DP guns is fitted in sponsoon casements on the lower hanger deck, each with its own interior armor screen.
while a set of DP guns are fitted flush along the edges of the landing deck.
A set of two-gun DP guns are mounted at the corners of the flight deck.

armor

An Armor deck proof against distant cruiser weapons is fitted,
also SAP/HE

Main belt covers from +1.5m above WL to -2.0m below WL.
It is outsloped 15 degrees
3.5/(cos15) = 3.623466 = 3.62m

Ends are protected by protective decks,
25/50 fore, and 55/80 aft. Expected to be proof vs. SAP/HE

A TDS is fitted, rising to meet the crown of the armor deck.
This provides splinter protection inside the belt.

Total Armor : 75 @ 15 + 40/2 = 104

Misc wt

Reserve : 100t

AD :
53t : FC
50t : Primitive RADAR, aerial direction indicator
25t : Hulesmeyer proximity detector
25t : Searchlights Night fighting
25t : LR Radio
10t : 2x SR Radio
30t : 30t plot room
23t : Add Fire Ext

OD
5t Paravanes
23t Add Fire Ext
20t 2 steam catapults landing deck
20t 2 steam catapults flying off deck

HAW:
2640t : 1/2 airgroup 66
23t : CO2 Compressor AC
23t : Enhanced Ventilation
23t : Add Fire Ext

HBW :
2640t : 1/2 airgroup 66
240t : AvGas in Doublewall tanks
23t : AvGas Fire Ext.
23t : Extra Pumps
240t : Additional AG Weapons

Decks
The two 'carrier decks' at 9m and 12m
are expected to represent two 6m hangers at 9m and 15m
12-5 = 7m, for flying off deck forward.
Ramps up to 8.3m at bow to allow dry forward.

+14.00 Landing Deck
+ 7.00 Flying off/ upper Hanger deck
+01.50 Main/ Lower Hanger Deck - TOP Belt, TDS, Armor Deck
-01.00m 2nd Platform Deck,
-2.0 Bottom Armor Belt.
-03.50m 1st Platform Deck
-07.00m Engineering Deck
-07.93m Double Bottom
-09.50m Keel

Kaiser Kirk · July 05, 2024, 08:09:28 PM

Next up, the 'Afson' class, named after magical spells.
This is a much more conventional carrier, if large.
Of all my designs, it's the fastest with the largest airgroup.

But as the rambling discussion above indicates, the technology of 1934
argues against putting so many resources into a carrier easily surprised
and knocked out by a single HE or SAP bomb wrecking the flight deck.

I really think the WWII experiences of the IJN carriers is a far better
guide for this design period than the USN carriers - radar made a big difference
in detecting incoming groups, and the USN seems to have had the very best AAA.

I may work to get it down to 27,000 even, as 27+9=36months,
but as the BP/HY jumps from 3.86BP/HY, to 4.5BP/HY,
there isn't a ton of gain.

QuoteAfson "Incantation", Parthia Fleet Carrier laid down 1933

Displacement:
   27,299 t light; 28,453 t standard; 31,650 t normal; 34,207 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (770.49 ft / 754.59 ft) x 91.86 ft x (26.90 / 28.68 ft)
   (234.85 m / 230.00 m) x 28.00 m x (8.20 / 8.74 m)

Armament:
24 - 5.12" / 130 mm 47.0 cal guns - 85.98lbs / 39.00kg shells, 360 per gun
     Dual purpose guns in deck and hoist mounts, 1929 Model
     8 x 2-gun mounts on centreline ends, evenly spread
     4 x 2-gun mounts on sides, forward deck aft
      2 raised mounts - superfiring
24 - 1.46" / 37.0 mm 70.0 cal guns - 1.72lbs / 0.78kg shells, 2,800 per gun
     Anti-air guns in deck and hoist mounts, 1929 Model
     6 x 2 row quad mounts on sides, evenly spread
36 - 0.91" / 23.0 mm 90.0 cal guns - 0.44lbs / 0.20kg shells, 5,000 per gun
     Anti-air guns in deck mounts, 1929 Model
     10 x Twin mounts on side ends, majority forward
     8 x Twin mounts layout not set
      4 double raised mounts
Weight of broadside 2,121 lbs / 962 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.72" / 120 mm   490.49 ft / 149.50 m   16.99 ft / 5.18 m
   Ends:   1.97" / 50 mm   264.07 ft / 80.49 m   12.01 ft / 3.66 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -15.00 degrees (positive = in)

- Torpedo Bulkhead - Additional damage containing bulkheads:
      2.24" / 57 mm   490.49 ft / 149.50 m   31.53 ft / 9.61 m
   Beam between torpedo bulkheads 72.18 ft / 22.00 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:   0.59" / 15 mm     -           -
   3rd:   0.31" / 8 mm     -           -

- Armoured deck - single deck:
   For and Aft decks: 2.95" / 75 mm
   Forecastle: 1.97" / 50 mm Quarter deck: 2.95" / 75 mm

- Conning towers: Forward 3.94" / 100 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 167,726 shp / 125,124 Kw = 32.00 kts
   Range 8,322nm at 18.00 kts
   Bunker at max displacement = 5,754 tons

Complement:
   1,186 - 1,542

Cost:
   £8.593 million / $34.372 million

Distribution of weights at normal displacement:
   Armament: 534 tons, 1.7 %
     - Guns: 534 tons, 1.7 %
   Armour: 6,103 tons, 19.3 %
     - Belts: 1,889 tons, 6.0 %
     - Torpedo bulkhead: 1,284 tons, 4.1 %
     - Armament: 151 tons, 0.5 %
     - Armour Deck: 2,694 tons, 8.5 %
     - Conning Tower: 85 tons, 0.3 %
   Machinery: 4,887 tons, 15.4 %
   Hull, fittings & equipment: 9,467 tons, 29.9 %
   Fuel, ammunition & stores: 4,351 tons, 13.7 %
   Miscellaneous weights: 6,308 tons, 19.9 %
     - Hull below water: 2,964 tons
     - Hull void weights: 130 tons
     - Hull above water: 2,964 tons
     - On freeboard deck: 53 tons
     - Above deck: 197 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     55,839 lbs / 25,328 Kg = 833.0 x 5.1 " / 130 mm shells or 7.4 torpedoes
   Stability (Unstable if below 1.00): 1.38
   Metacentric height 7.7 ft / 2.4 m
   Roll period: 13.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.14
   Seaboat quality (Average = 1.00): 1.47

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.594 / 0.602
   Length to Beam Ratio: 8.21 : 1
   'Natural speed' for length: 27.47 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 48
   Bow angle (Positive = bow angles forward): 11.00 degrees
   Stern overhang: 9.84 ft / 3.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   20.00 %, 31.17 ft / 9.50 m, 29.53 ft / 9.00 m
     - Forward deck:   30.00 %, 29.53 ft / 9.00 m, 29.53 ft / 9.00 m
     - Aft deck:   35.00 %, 29.53 ft / 9.00 m, 29.53 ft / 9.00 m
     - Quarter deck:   15.00 %, 29.53 ft / 9.00 m, 29.53 ft / 9.00 m
     - Average freeboard:      29.66 ft / 9.04 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 98.8 %
      - Above water (accommodation/working, high = better): 239.1 %
   Waterplane Area: 50,416 Square feet or 4,684 Square metres
   Displacement factor (Displacement / loading): 133 %
   Structure weight / hull surface area: 128 lbs/sq ft or 627 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.41
      - Overall: 1.00
   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

Parthian version of Ark Royal
Intended 1 per fleet, and 2 for Home fleet, 5 in total.

Incantation - Afson
Magician - Kundag
Sorcerer - Jadug
Magic - Kundagih
Sorcery - Jadugih
Magus - Moymard
Spell - Marig

Control Tower
One tower, on the starboard side is fitted.
The tower is designed to be as smooth as possible
so as not to disrupt air flow.

Guns
As the historical British carriers, two mounts are mounted on each corner of the deck, for a total of 8.
In true Parthian form, they then follow the American practice of two-gun mounts for and aft of the tower. For 4 more.

The 37mm and 23mm alternate down the sides of the deck,
and each side of the tower has 1 twin 23mm on each face at each level.

4684/65 = 72 planes
72*80 = 5760

Belt :
2 Deck levels (5.0m) high
outsloped 15 degrees
5/cos(15) = 5.17638 = 5.18

TDS rises behind belt, above WL.
Horizontal pen : 148mm

Vert pen : 75mm

End Belt Fore : Protective deck 50/100
End Belt Stern : Protective Deck 75/125

Miscellaneous Weight
150t - Reserve

AD
54t - Fire Control 1930
25t - Long Range Radio
0t - SR Radio
10t - SR Radio - Deck Operations
10t - SR Radio - CAG
10t - RDF
10t - Radio Jammer
50t - Squadron Assembly Room.
28t - Vessel Ventilation, intakes

OD
5t - Paravanes
28t - Vessel Ventilation
20t - 2 x Steam catapults

HAW
2880 - Provisions for 36 Aircraft
28t Additional Fire Extenguishers
28t Hanger Ventilation
28t Vessel Ventilation

HBW
2880t - Provisions for 36 Aircraft
28t Hanger Ventilation
28t Extra Pumps
28t Extra Fire Ext

Decks
+11.9 Flight Deck
+6.9 Lower Hanger Deck
+4.4 Battery Deck
+1.9 Main Armor Deck, Top TDS
-0.6 2nd Platform Deck
-3.1 1st Platform Deck
-6.6 Engineering
-7.71 Double Bottom
-8.15 Keel

The Rock Doctor · July 05, 2024, 08:20:00 PM

See if a small transom saves you enough machinery weight to cut the displacement below 27000?

Kaiser Kirk · July 05, 2024, 08:28:52 PM

I don't have small transom yet..not even in the game :)
While I expect I will move my 1935 submarine research into the 1932 cruiser tech,
that still won't be complete 1933.0.

But I was just fiddling with the ship.
Subtracted 0.1m from the draft.
Same Waterplane area = same airgroup.
31.66 knots instead of 32knots.
I don't think that's a critical difference.
Alternately I could have kept 32knots and trimmed the belt to 100mm,
but considering my concerns about surface raiders, I think I'll keep the 120mm belt.

Same ship, trimmed to 27,000ts.

QuoteAfson II "Incantation", Parthia Fleet Carrier laid down 1933

Displacement:
   27,000 t light; 28,146 t standard; 31,264 t normal; 33,758 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (770.49 ft / 754.59 ft) x 91.86 ft x (26.57 / 28.31 ft)
   (234.85 m / 230.00 m) x 28.00 m x (8.10 / 8.63 m)

Armament:
24 - 5.12" / 130 mm 47.0 cal guns - 85.98lbs / 39.00kg shells, 360 per gun
     Dual purpose guns in deck and hoist mounts, 1929 Model
     8 x 2-gun mounts on centreline ends, evenly spread
     4 x 2-gun mounts on sides, forward deck aft
      2 raised mounts - superfiring
24 - 1.46" / 37.0 mm 70.0 cal guns - 1.72lbs / 0.78kg shells, 2,800 per gun
     Anti-air guns in deck and hoist mounts, 1929 Model
     6 x 2 row quad mounts on sides, evenly spread
36 - 0.91" / 23.0 mm 90.0 cal guns - 0.44lbs / 0.20kg shells, 5,000 per gun
     Anti-air guns in deck mounts, 1929 Model
     10 x Twin mounts on side ends, majority forward
     8 x Twin mounts layout not set
      4 double raised mounts
Weight of broadside 2,121 lbs / 962 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.72" / 120 mm   490.49 ft / 149.50 m   16.99 ft / 5.18 m
   Ends:   1.97" / 50 mm   264.07 ft / 80.49 m   12.01 ft / 3.66 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -15.00 degrees (positive = in)

- Torpedo Bulkhead - Additional damage containing bulkheads:
      2.24" / 57 mm   490.49 ft / 149.50 m   31.23 ft / 9.52 m
   Beam between torpedo bulkheads 72.18 ft / 22.00 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:   0.59" / 15 mm     -           -
   3rd:   0.31" / 8 mm     -           -

- Armoured deck - single deck:
   For and Aft decks: 2.95" / 75 mm
   Forecastle: 1.97" / 50 mm Quarter deck: 2.95" / 75 mm

- Conning towers: Forward 3.94" / 100 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 159,543 shp / 119,019 Kw = 31.66 kts
   Range 8,162nm at 18.00 kts
   Bunker at max displacement = 5,612 tons

Complement:
   1,175 - 1,528

Cost:
   £8.386 million / $33.542 million

Distribution of weights at normal displacement:
   Armament: 534 tons, 1.7 %
     - Guns: 534 tons, 1.7 %
   Armour: 6,094 tons, 19.5 %
     - Belts: 1,893 tons, 6.1 %
     - Torpedo bulkhead: 1,272 tons, 4.1 %
     - Armament: 151 tons, 0.5 %
     - Armour Deck: 2,694 tons, 8.6 %
     - Conning Tower: 84 tons, 0.3 %
   Machinery: 4,649 tons, 14.9 %
   Hull, fittings & equipment: 9,416 tons, 30.1 %
   Fuel, ammunition & stores: 4,264 tons, 13.6 %
   Miscellaneous weights: 6,308 tons, 20.2 %
     - Hull below water: 2,964 tons
     - Hull void weights: 130 tons
     - Hull above water: 2,964 tons
     - On freeboard deck: 53 tons
     - Above deck: 197 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     56,620 lbs / 25,682 Kg = 844.6 x 5.1 " / 130 mm shells or 7.7 torpedoes
   Stability (Unstable if below 1.00): 1.38
   Metacentric height 7.7 ft / 2.4 m
   Roll period: 13.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 72 %
         - Recoil effect (Restricted arc if above 1.00): 0.14
   Seaboat quality (Average = 1.00): 1.50

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.594 / 0.602
   Length to Beam Ratio: 8.21 : 1
   'Natural speed' for length: 27.47 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 48
   Bow angle (Positive = bow angles forward): 11.00 degrees
   Stern overhang: 9.84 ft / 3.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   20.00 %, 31.17 ft / 9.50 m, 29.53 ft / 9.00 m
     - Forward deck:   30.00 %, 29.53 ft / 9.00 m, 29.53 ft / 9.00 m
     - Aft deck:   35.00 %, 29.53 ft / 9.00 m, 29.53 ft / 9.00 m
     - Quarter deck:   15.00 %, 29.53 ft / 9.00 m, 29.53 ft / 9.00 m
     - Average freeboard:      29.66 ft / 9.04 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 96.9 %
      - Above water (accommodation/working, high = better): 241.3 %
   Waterplane Area: 50,416 Square feet or 4,684 Square metres
   Displacement factor (Displacement / loading): 134 %
   Structure weight / hull surface area: 128 lbs/sq ft or 625 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.41
      - 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

5.18
3.66
2.44
9.61

Parthian version of Ark Royal
Intended 1 per fleet, and 2 for Home fleet, 5 in total.

Incantation - Afson
Magician - Kundag
Sorcerer - Jadug
Magic - Kundagih
Sorcery - Jadugih
Magus - Moymard
Spell - Marig

Control Tower
One tower, on the starboard side is fitted.
The tower is designed to be as smooth as possible
so as not to disrupt air flow.

Guns
As the historical British carriers, two mounts are mounted on each corner of the deck, for a total of 8.
In true Parthian form, they then follow the American practice of two-gun mounts for and aft of the tower. For 4 more.

The 37mm and 23mm alternate down the sides of the deck,
and each side of the tower has 1 twin 23mm on each face at each level.

4684/65 = 72 planes
72*80 = 5760

Belt :
2 Deck levels (5.0m) high
outsloped 15 degrees
5/cos(15) = 5.17638 = 5.18

TDS rises behind belt, above WL.
Horizontal pen : 148mm

Vert pen : 75mm

End Belt Fore : Protective deck 50/100
End Belt Stern : Protective Deck 75/125

Miscellaneous Weight
150t - Reserve

AD
54t - Fire Control 1930
25t - Long Range Radio
0t - SR Radio
10t - SR Radio - Deck Operations
10t - SR Radio - CAG
10t - RDF
10t - Radio Jammer
50t - Squadron Assembly Room.
28t - Vessel Ventilation, intakes

OD
5t - Paravanes
28t - Vessel Ventilation
20t - 2 x Steam catapults

HAW
2880 - Provisions for 36 Aircraft
28t Additional Fire Extenguishers
28t Hanger Ventilation
28t Vessel Ventilation

HBW
2880t - Provisions for 36 Aircraft
28t Hanger Ventilation
28t Extra Pumps
28t Extra Fire Ext

Decks
+11.9 Flight Deck
+6.9 Lower Hanger Deck
+4.4 Battery Deck
+1.9 Main Armor Deck, Top TDS
-0.6 2nd Platform Deck
-3.1 1st Platform Deck
-6.6 Engineering
-7.62 Double Bottom
-7.81 Keel

Kaiser Kirk · July 05, 2024, 09:19:21 PM

The last of the 'conventional' carriers, the 'Burning Bow'
is the first to have the 115L47 instead of the 130mm, so not as good against surface combatants,
but the 115 has the same 25kg shell as my 120mm - smaller, denser, fires flatter and carries velocity well for accuracy. At night, the higher ROF should make it better, and it should also do well vs. Aircraft.

Still keeping the flying off deck, to aid in launch rate. The Afson did not have it, but without Early warning, being able to surge fighters is still a priority. Somewhere in the future I will probably have to bulge these flying off deck ships, add a bow section, and lower the speed due to the extra water resistance. But I keep obsessing about the tactical environment of 1932 when it's designed, not the techs in the future which well change those needs.

This has both the British 'frying pan' deck edge mounts, and USN style mounts fore/aft of the tower.
That gives a formidable theoretical broadside, though the USN mounts may not be able to fire cross-deck if aircraft are on it.

The carrier has heavy deck armor but lighter belt armor. The deck armor is a two layer system with a main and splinter deck. The design expects most fire to be long range, and defense against armor penetrating bombs and long range shells.

QuoteWaxsendag Kaman 'Burning Bow', Parthia Fleet Carrier laid down 1933

Displacement:
25,509 t light; 26,524 t standard; 29,628 t normal; 32,112 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(621.68 ft / 610.24 ft) x 95.14 ft (Bulges 104.99 ft) x (27.07 / 29.12 ft)
(189.49 m / 186.00 m) x 29.00 m (Bulges 32.00 m) x (8.25 / 8.88 m)

Armament:
24 - 4.53" / 115 mm 47.0 cal guns - 55.12lbs / 25.00kg shells, 420 per gun
Dual purpose guns in deck and hoist mounts, 1931 Model
8 x 4-gun mounts on centreline ends, evenly spread
4 x 2-gun mounts on sides, forward deck aft
2 raised mounts - superfiring
24 - 1.46" / 37.0 mm 70.0 cal guns - 1.72lbs / 0.78kg shells, 3,000 per gun
Anti-air guns in deck and hoist mounts, 1929 Model
6 x 2 row quad mounts on sides, evenly spread
36 - 0.91" / 23.0 mm 90.0 cal guns - 0.44lbs / 0.20kg shells, 5,000 per gun
Anti-air guns in deck mounts, 1929 Model
10 x Twin mounts on side ends, majority forward
8 x Twin mounts layout not set
4 double raised mounts
Weight of broadside 1,380 lbs / 626 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.94" / 100 mm 396.65 ft / 120.90 m 13.58 ft / 4.14 m
Ends: 1.38" / 35 mm 213.55 ft / 65.09 m 12.01 ft / 3.66 m
Main Belt covers 100 % of normal length
Main Belt inclined -15.00 degrees (positive = in)

- Torpedo Bulkhead - Additional damage containing bulkheads:
1.73" / 44 mm 396.65 ft / 120.90 m 27.13 ft / 8.27 m
Beam between torpedo bulkheads 72.18 ft / 22.00 m

- Hull Bulges:
0.35" / 9 mm 394.52 ft / 120.25 m 20.51 ft / 6.25 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: 0.59" / 15 mm - -
3rd: 0.31" / 8 mm - -

- Protected deck - single deck:
For and Aft decks: 3.94" / 100 mm
Forecastle: 1.38" / 35 mm Quarter deck: 2.95" / 75 mm

- Conning towers: Forward 4.33" / 110 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 144,346 shp / 107,682 Kw = 30.00 kts
Range 8,122nm at 18.00 kts
Bunker at max displacement = 5,588 tons

Complement:
1,128 - 1,467

Cost:
£7.608 million / $30.432 million

Distribution of weights at normal displacement:
Armament: 383 tons, 1.3 %
- Guns: 383 tons, 1.3 %
Armour: 4,967 tons, 16.8 %
- Belts: 1,055 tons, 3.6 %
- Torpedo bulkhead: 690 tons, 2.3 %
- Bulges: 106 tons, 0.4 %
- Armament: 170 tons, 0.6 %
- Armour Deck: 2,857 tons, 9.6 %
- Conning Tower: 89 tons, 0.3 %
Machinery: 4,206 tons, 14.2 %
Hull, fittings & equipment: 9,215 tons, 31.1 %
Fuel, ammunition & stores: 4,119 tons, 13.9 %
Miscellaneous weights: 6,738 tons, 22.7 %
- Hull below water: 3,135 tons
- Bulge void weights: 216 tons
- Hull above water: 3,135 tons
- On freeboard deck: 75 tons
- Above deck: 177 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
63,503 lbs / 28,804 Kg = 1,368.5 x 4.5 " / 115 mm shells or 8.5 torpedoes
Stability (Unstable if below 1.00): 1.53
Metacentric height 9.5 ft / 2.9 m
Roll period: 14.3 seconds
Steadiness - As gun platform (Average = 50 %): 76 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 1.69

Hull form characteristics:
Hull has low forecastle,
a ram bow and a cruiser stern
Block coefficient (normal/deep): 0.598 / 0.602
Length to Beam Ratio: 5.81 : 1
'Natural speed' for length: 24.70 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 45
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 %, 22.97 ft / 7.00 m, 22.97 ft / 7.00 m
- Forward deck: 30.00 %, 39.37 ft / 12.00 m, 39.37 ft / 12.00 m
- Aft deck: 35.00 %, 39.37 ft / 12.00 m, 39.37 ft / 12.00 m
- Quarter deck: 15.00 %, 39.37 ft / 12.00 m, 39.37 ft / 12.00 m
- Average freeboard: 36.09 ft / 11.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 98.8 %
- Above water (accommodation/working, high = better): 281.8 %
Waterplane Area: 42,385 Square feet or 3,938 Square metres
Displacement factor (Displacement / loading): 139 %
Structure weight / hull surface area: 133 lbs/sq ft or 650 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.87
- Longitudinal: 3.26
- 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

Parthian Carrier with Flying off Deck.

Waxsendag kaman = Burning Bow

Control Tower
One tower, on the starboard side is fitted.
The tower is designed to be as smooth as possible
so as not to disrupt air flow.

Guns
Fitted with the new 115mm, firing the same size round as the 120mm.
The better sectional density means a flatter, further firing round, more effective
for AA work, while retaining effectiveness against surface targets.

As the historical British carriers, two mounts are mounted on each corner of the deck, for a total of 8. In true Parthian form, they then follow the American practice of two-gun mounts for and aft of the tower. For 4 more.

The 37mm and 23mm alternate down the sides of the deck,
and each side of the tower has 1 twin 23mm on each face at each level.

Airgroup
Double Hanger
4253/55 = 77 planes
77*80 = 6120

Armor

Belt

The Belt armor covers from +2m to -2m
and is outsloped 15 degrees.
4 / cos(15) = 4.1411= 4.14

The Waterline belt is backed by the 35mm splinter protective deck and TDS.
This gives 100 + (35*1.5/2) + (44/2) = 148, before considering the inclined belt.

End Belt Fore : Protective deck 35/70 Flat/slopes
End Belt Stern : Protective Deck 75/110 flat/slopes

Deck
A 65mm Upper Deck caps the main belt.
A 35mm Protective deck serves as a splinter deck behnd the main belt.

TDS
9mm thin skilled bulge
1.5m liquid fill
Mild Steel Hull Metal
1.5m liquid filll
A 19mm STS partion
2.0 Void
A 35mm Holding Bulkhead

The TDS rises to meet the bottom of the Protective Splinter deck at +0.5m

Miscellaneous Weight
150t - Reserve

AD
39t - Fire Control 1930
25t - Long Range Radio
0t - SR Radio
10t - SR Radio - Deck Operations
10t - SR Radio - CAG
10t - RDF
10t - Radio Jammer
50t - Squadron Assembly Room.
25t - Vessel Ventilation, intakes

OD
5t - Paravanes
25t - Vessel Ventilation
20t - 2 x Steam catapults
25t - Extra Fire Extinguisher

HAW
3060- Provisions for 33.5 Aircraft
25t Additional Fire Extenguishers
25t Hanger Ventilation
25t Vessel Ventilation

HBW
3060t - Provisions for 33.5 Aircraft
25t Hanger Ventilation
25t Extra Pumps
25t Extra Fire Ext

Decks
+12.0 Flight Deck
+7.00 Lower flight Deck
+2.00 Lower Hanger Floor / Battery Deck - 65mm , Top Main Belt,
+0.50 Protective Splinter Deck 35mm , Top TDS
-2.00 2nd Platform Deck, Bottom Main Belt, Bottom Splinter Deck
-4.50 1st Platform Deck
-7.00 Engineering
-7.88 Double Bottom
-8.25 Keel

I'll post the two armored carriers later in the weekend :)

Kaiser Kirk · July 06, 2024, 11:31:53 PM

Anyhow, while I like the three prior carriers, I'm very much thinking an armored carrier should at least be entertained.

For some reason I seem to lack the BP to build every design I create...argh.

The belt armor at 100mm is thinner, but backed by both a protective deck and the TDS, for 147mm at the waterline. Vertical protection is 83mm, and the vessel should be pretty bomb proof for the era.

from US Cruisers :
2" for 500lb from 11,000ft
2.4" for 1,000 from 10,000ft

Speed is 30.5 knots, so I could trim that to gain more armor if needed.

from US Cruisers :
2" for 500lb from 11,000ft
2.4" for 1,000 from 10,000ft

Tidbit on flight deck cruiser designs : Desired flight deck length on Flight Deck Cruiser was 332 feet with an elevator forward, and 32.5knot speed. With 24 aircraft on deck, 130ft would be available to take off on. Only 12 planes could be spotted forward while landing.

pg168 bottom – carriers large vs. small.
234 clear flight deck for fdc
130ft to fly off w 30knts over deck
sb2u-2 needed 332ft 225knts
1.25min for cat launch
2.5-3min for elevator

QuoteGurdihskarag "Armored Bird of Prey", Parthia Fleet Armored Carrier laid down 1933

Displacement:
27,000 t light; 27,979 t standard; 30,309 t normal; 32,173 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(673.66 ft / 656.17 ft) x 98.43 ft x (27.89 / 29.28 ft)
(205.33 m / 200.00 m) x 30.00 m x (8.50 / 8.93 m)

Armament:
24 - 4.53" / 115 mm 47.0 cal guns - 55.12lbs / 25.00kg shells, 360 per gun
Dual purpose guns in deck and hoist mounts, 1933 Model
8 x 4-gun mounts on centreline ends, evenly spread
4 x 2-gun mounts on sides, forward deck aft
2 raised mounts - superfiring
24 - 1.46" / 37.0 mm 70.0 cal guns - 1.72lbs / 0.78kg shells, 2,800 per gun
Anti-air guns in deck and hoist mounts, 1933 Model
6 x 2 row quad mounts on sides, evenly spread
36 - 0.91" / 23.0 mm 90.0 cal guns - 0.44lbs / 0.20kg shells, 5,000 per gun
Anti-air guns in deck mounts, 1933 Model
10 x Twin mounts on side ends, majority forward
8 x Twin mounts layout not set
4 double raised mounts
Weight of broadside 1,380 lbs / 626 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.94" / 100 mm 426.51 ft / 130.00 m 10.20 ft / 3.11 m
Ends: 1.38" / 35 mm 229.63 ft / 69.99 m 12.01 ft / 3.66 m
Upper: 2.36" / 60 mm 426.51 ft / 130.00 m 37.37 ft / 11.39 m
Main Belt covers 100 % of normal length
Main Belt inclined -15.00 degrees (positive = in)

- Torpedo Bulkhead - Additional damage containing bulkheads:
1.57" / 40 mm 426.51 ft / 130.00 m 29.46 ft / 8.98 m
Beam between torpedo bulkheads 70.21 ft / 21.40 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: 0.59" / 15 mm - -
3rd: 0.31" / 8 mm - -

- Armoured deck - multiple decks:
For and Aft decks: 3.94" / 100 mm
Forecastle: 1.38" / 35 mm Quarter deck: 1.77" / 45 mm

- Conning towers: Forward 3.94" / 100 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 146,852 shp / 109,551 Kw = 30.50 kts
Range 8,080nm at 16.00 kts
Bunker at max displacement = 4,195 tons

Complement:
1,148 - 1,493

Cost:
£7.903 million / $31.611 million

Distribution of weights at normal displacement:
Armament: 383 tons, 1.3 %
- Guns: 383 tons, 1.3 %
Armour: 6,546 tons, 21.6 %
- Belts: 2,511 tons, 8.3 %
- Torpedo bulkhead: 732 tons, 2.4 %
- Armament: 170 tons, 0.6 %
- Armour Deck: 3,051 tons, 10.1 %
- Conning Tower: 82 tons, 0.3 %
Machinery: 4,279 tons, 14.1 %
Hull, fittings & equipment: 9,943 tons, 32.8 %
Fuel, ammunition & stores: 3,310 tons, 10.9 %
Miscellaneous weights: 5,848 tons, 19.3 %
- Hull below water: 2,681 tons
- Hull void weights: 230 tons
- Hull above water: 2,681 tons
- On freeboard deck: 77 tons
- Above deck: 179 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
68,701 lbs / 31,162 Kg = 1,480.5 x 4.5 " / 115 mm shells or 8.9 torpedoes
Stability (Unstable if below 1.00): 1.39
Metacentric height 8.6 ft / 2.6 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 76 %
- Recoil effect (Restricted arc if above 1.00): 0.10
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck,
a ram bow and a cruiser stern
Block coefficient (normal/deep): 0.589 / 0.595
Length to Beam Ratio: 6.67 : 1
'Natural speed' for length: 25.62 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 38
Bow angle (Positive = bow angles forward): 11.00 degrees
Stern overhang: 9.84 ft / 3.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 39.37 ft / 12.00 m, 39.37 ft / 12.00 m
- Forward deck: 30.00 %, 39.37 ft / 12.00 m, 39.37 ft / 12.00 m
- Aft deck: 35.00 %, 39.37 ft / 12.00 m, 39.37 ft / 12.00 m
- Quarter deck: 15.00 %, 39.37 ft / 12.00 m, 39.37 ft / 12.00 m
- Average freeboard: 39.37 ft / 12.00 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 99.2 %
- Above water (accommodation/working, high = better): 305.4 %
Waterplane Area: 46,752 Square feet or 4,343 Square metres
Displacement factor (Displacement / loading): 137 %
Structure weight / hull surface area: 128 lbs/sq ft or 625 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.86
- Longitudinal: 3.61
- 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

Parthian Armored Carrier

Gurdih : Armor
Skarag : Bird of Prey

Intended 1 per fleet, and 2 for Home fleet, 5 in total.

Control Tower
One tower, on the starboard side is fitted.
The tower is designed to be as smooth as possible
so as not to disrupt air flow.

Guns
Fitted with the new 115mm, firing the same size round as the 120mm.
The better sectional density means a flatter, further firing round, more effective
for AA work, while retaining effectiveness against surface targets.

As the historical British carriers, two mounts are mounted on each corner of the deck, for a total of 8. In true Parthian form, they then follow the American practice of two-gun mounts for and aft of the tower. For 4 more.

The 37mm and 23mm alternate down the sides of the deck,
and each side of the tower has 1 twin 23mm on each face at each level.

Airgroup

4343/65 = 66.8 planes
66*80 = 5280

Armor

Belt
The Armored Carrier is divided into two strakes
The Waterline belt is 100mm covering from +1.0 to -2.0
that is 3/cos (15) = 3.1058 =3.11

The upper portion at 2.5 inches (60mm) covers from +1.0 to +12.00
where it meets the armored flight deck.
11/cos (15) = 11.38803 = 11.39

The Waterline belt is backed by the splinter protective deck and TDS.
This gives 100 + (35*1.5/2) + (40/2) = 147, before considering the inclined belt.

End Belt Fore : Protective deck 35/70
End Belt Stern : Protective Deck 45/80

Deck
65mm Flight Deck at 12m

35mm Protective splinter deck at 1m to -1.5m

TDS
A 3m deeep TDS on each side is backed by a heavy 40mm bulkhead.
A simple partition divides the outer 1.5m liquid filled from the interior 1.5m void.

The TDS rises to meet the bottom of the Protective Deck at 1m

Miscellaneous Weight
150t - Reserve

AD
39t - Fire Control 1930
25t - Long Range Radio
0t - SR Radio
10t - SR Radio - Deck Operations
10t - SR Radio - CAG
10t - RDF
10t - Radio Jammer
50t - Squadron Assembly Room.
27t - Vessel Ventilation, intakes

OD
5t - Paravanes
25t - Vessel Ventilation
20t - 2 x Steam catapults
27t - Extra Fire Extinguisher

HAW
2640- Provisions for 33 Aircraft
27t Additional Fire Extenguishers
27t Hanger Ventilation
27t Vessel Ventilation

HBW
2640t - Provisions for 33 Aircraft
27t Hanger Ventilation
27t Extra Pumps
27t Extra Fire Ext

Decks
+12.0 Flight Deck - 65mm , top upper belt
+6.00 Lower Hanger Deck
+3.50 Battery Deck
+1.00 Protective Splinter Deck 35mm , Top TDS
-1.50 2nd Platform Deck, Bottom Splinter Deck
-2.0 Bottom of Armor Belt
-4.00 1st Platform Deck
-7.00 Engineering
-8.00 Double Bottom
-8.33 Keel

Currently the expectation is the carriers will be stationed a little behind the battleships,
with these bigger ones being able to launch strikes.

While a speed about the cruisers is seem as advantageous for a high speed advance and dawn strike, most of those are 30 knots. Without an independent strike passage, the utility of the Afson's 32 knots is not clear.

As mentioned prior, in the 1932 design year, there is considerable concern about strikes slipping through and disabling the carriers, or being caught by light surface forces. Since it seems unlikely the opposition would put large expensive warships at risk of meeting destroyers at night at short range and collecting torpedoes, light cruiser/destroyers are the expected foe. So 130/115 seems adequate to blanket them with HE - holing the stack, breaking searchlights, or destroying fire control- while the carrier heads for the nearest battlegroup.

That could argue for casement 165mm like the IJN carriers had...

So after all that this is the first one,
this does not have a flying off deck forward, which the other does.
and carries the same number of planes as Charmosh at only 4000 tons more.
At 200m, it's longer than most of the others.