Parthian Ships 1928 +

[The Rock Doctor]

Jef just wants you to have fewer guns on your cruisers.

[TacCovert4]

With the new cruiser rules coming up for me, I've started playing with 10,000 tonners myself, but I'm sticking to 180mm guns on that hull size, 240 is just too much of a compromise

[Kaiser Kirk]

Jef just wants you to have fewer guns on your cruisers.

The Panzerschiffs were also a very cool design to occupy a particular hole in the treaties.

I believe I had some in Wesworld as the Netherlands, simply as they were lean.

Gunwise they are the minimal way to mount a larger gun, but I don't care for the slight penalties of not having a 4-shell ladder and the slight knock on ROF of a triple vs. a twin.

I know I have likings for certain stylistic elements.
For me, it tends to be the classic 4 x two-gun turrets, or the 3-2   2-3 combo.
Oh, and flying off decks...

I actually don't like quad turrets, but embraced them for this game.

[Kaiser Kirk]

With the new cruiser rules coming up for me, I've started playing with 10,000 tonners myself, but I'm sticking to 180mm guns on that hull size, 240 is just too much of a compromise

I developed the 215L47 for what became the Xiyon class.
For the 10,000 tonners, I was/am planning on my new 165mm, which fires an overweight shell of 80kg...the same as my early 180mm.

I did not expect to be able to fit the 215 on the cruiser hull and get a decent ship, and did have to drop speed to make it. No where near armored against own gun though.

[Kaiser Kirk]

Anyhow, I'll start with the two Xiyon types.
I have the 1st two Xiyons well along, so this is an update of that.
The question is to continue the class beyond that.
That is where the Zadar / Manzikerts come in.

The Xiyon with newer engines and a small transom has a comp hull of 1.07,
but the space required for the belt drops from 133.5m to 123.5m
This allows the QD to be changed from 9% to 14%
but fuel has to be added to get LD down to 15,000 again.
All of which boosts comp hull to 1.09 and then down to 1.07

Which is quite alot.
What to do with it?

Xiyon LXII, Parthian Light Armored Cruiser laid down 1934

Displacement:
   15,000 t light; 16,121 t standard; 18,939 t normal; 21,192 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (623.36 ft / 616.80 ft) x 59.06 ft (Bulges 65.62 ft) x (31.50 / 34.61 ft)
   (190.00 m / 188.00 m) x 18.00 m (Bulges 20.00 m)  x (9.60 / 10.55 m)

Armament:
      8 - 8.46" / 215 mm 47.0 cal guns - 396.83lbs / 180.00kg shells, 200 per gun
     Breech loading guns in turret on barbette mounts, 1931 Model
     2 x 4-gun mounts on centreline ends, evenly spread
      16 - 5.12" / 130 mm 47.0 cal guns - 85.98lbs / 39.00kg shells, 400 per gun
     Dual purpose guns in deck and hoist mounts, 1931 Model
     6 x 2-gun mounts on sides, evenly spread
     2 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts
      24 - 1.46" / 37.0 mm 70.0 cal guns - 1.72lbs / 0.78kg shells, 2,400 per gun
     Dual purpose guns in deck and hoist mounts, 1929 Model
     6 x 2 row quad mounts on sides, evenly spread
      6 raised mounts
      24 - 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
     12 x Twin mounts on sides, evenly spread
      12 double raised mounts
      Weight of broadside 4,602 lbs / 2,088 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   7.09" / 180 mm   407.09 ft / 124.08 m   12.57 ft / 3.83 m
   Ends:   1.38" / 35 mm   209.68 ft / 63.91 m   12.01 ft / 3.66 m
     Main Belt covers 102 % of normal length
     Main Belt inclined -15.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.50" / 38 mm   407.09 ft / 124.08 m   33.99 ft / 10.36 m
   Beam between torpedo bulkheads 45.93 ft / 14.00 m

   - Hull Bulges:
      0.35" / 9 mm   413.39 ft / 126.00 m   25.59 ft / 7.80 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   8.27" / 210 mm   4.72" / 120 mm      6.50" / 165 mm
   2nd:   2.56" / 65 mm   1.57" / 40 mm      1.57" / 40 mm
   3rd:   0.31" / 8 mm         -         0.31" / 8 mm
   4th:   0.31" / 8 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 3.02" / 77 mm
   Forecastle: 1.57" / 40 mm  Quarter deck: 2.76" / 70 mm

   - Conning towers: Forward 8.27" / 210 mm, Aft 1.57" / 40 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 115,986 shp / 86,525 Kw = 32.00 kts
   Range 6,328nm at 22.00 kts
   Bunker at max displacement = 5,071 tons

Complement:
   806 - 1,049

Cost:
   £6.680 million / $26.718 million

Distribution of weights at normal displacement:
   Armament: 1,103 tons, 5.8 %
      - Guns: 1,103 tons, 5.8 %
   Armour: 4,610 tons, 24.3 %
      - Belts: 1,610 tons, 8.5 %
      - Torpedo bulkhead: 766 tons, 4.0 %
      - Bulges: 139 tons, 0.7 %
      - Armament: 590 tons, 3.1 %
      - Armour Deck: 1,356 tons, 7.2 %
      - Conning Towers: 151 tons, 0.8 %
   Machinery: 3,337 tons, 17.6 %
   Hull, fittings & equipment: 5,357 tons, 28.3 %
   Fuel, ammunition & stores: 3,939 tons, 20.8 %
   Miscellaneous weights: 593 tons, 3.1 %
      - Hull below water: 61 tons
      - Bulge void weights: 160 tons
      - Hull above water: 30 tons
      - On freeboard deck: 167 tons
      - Above deck: 175 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     22,242 lbs / 10,089 Kg = 73.3 x 8.5 " / 215 mm shells or 3.3 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 2.7 ft / 0.8 m
   Roll period: 16.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.73
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and small transom stern
   Block coefficient (normal/deep): 0.520 / 0.530
   Length to Beam Ratio: 9.40 : 1
   'Natural speed' for length: 26.68 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   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 %,  27.56 ft / 8.40 m,  24.93 ft / 7.60 m
      - Forward deck:   36.00 %,  24.93 ft / 7.60 m,  24.93 ft / 7.60 m
      - Aft deck:   30.00 %,  14.44 ft / 4.40 m,  14.44 ft / 4.40 m
      - Quarter deck:   14.00 %,  14.44 ft / 4.40 m,  15.42 ft / 4.70 m
      - Average freeboard:      20.59 ft / 6.28 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 101.3 %
      - Above water (accommodation/working, high = better): 120.6 %
   Waterplane Area: 25,318 Square feet or 2,352 Square metres
   Displacement factor (Displacement / loading): 123 %
   Structure weight / hull surface area: 127 lbs/sq ft or 621 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.94
      - Longitudinal: 1.76
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room



31t Aux Diesel generator.

Change the 40/70/70 deck to a
104t -  65mm magazine box protection
1,252t - 40/70/70 armored deck
--------
1,356t needed
1,356t paid

Increaase Main battery armor - they are turrets after all, they can take the weight.

Increase main belt to 180mm.



Armor 
So this version lacks an armored upper hull, but has good protection for vitals.
Not as good as the LXIII verison.

Vertical protection
Magazines : 70+65 = 135mm
Machinery : 70mm

Horizontal protection
180mm belt, 38mm TDS, 65mm magazine box = 100% + 50% + 50% = 231.5



Misc Wt :
120t  Const Resv

AD
100t FC
25t LR Radio
25t Searchlight Tower (NF)
25t Hulesmeyer


OD
5t  - Paravanes
32t - 2 x Quad 21" 4t

Amidships Aircraft handling area
10t : 2x Gunpowder Cat   over TT
Typically 1 loaded with the fighters, while the other
1 cycle the scouts
100t : 2 x Fighter Floatplanes, 2x Scout
20t : Hanger


HAW
15t: CO2 Compressor AC
15t : Extra Fire Suppression

HBW
15t   :  Enhanced Hydrophones.
15t   : Extra Pumps.


Decks :
 7.6   Forecastle  Deck
 4.4   Weather  Deck
 1.9   Main Deck, top main belt, armored deck, top TDS
-0.6   2nd deck
             -1.8   Bottom Main Belt
-3.1   1st Deck
-7.6    Engineering
-8.66  Keel, Double Bottom

[Kaiser Kirk]

The original Xiyon considerations had 2 types, one 'all or nothing' and a second
with a protected upper hull to defeat bombs and HE, to reduce 'mission kill'.
That cost 2 knots then, 1 knot now.

The belt is still the 165mm of the original ships,
but is part of a layered system.

The combination of deck + splinter deck + magazine box
or Belt + protective deck + TDS+ magazine box
both give very good protection against suddenly blowing up.
And pretty good protection for the machinery.

Xiyon LXIII, Parthian Light Armored Cruiser laid down 1934

Displacement:
   15,000 t light; 16,121 t standard; 18,939 t normal; 21,192 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (623.36 ft / 616.80 ft) x 59.06 ft (Bulges 65.62 ft) x (31.50 / 34.61 ft)
   (190.00 m / 188.00 m) x 18.00 m (Bulges 20.00 m)  x (9.60 / 10.55 m)

Armament:
      8 - 8.46" / 215 mm 47.0 cal guns - 396.83lbs / 180.00kg shells, 200 per gun
     Breech loading guns in turret on barbette mounts, 1931 Model
     2 x 4-gun mounts on centreline ends, evenly spread
      16 - 5.12" / 130 mm 47.0 cal guns - 85.98lbs / 39.00kg shells, 400 per gun
     Dual purpose guns in deck and hoist mounts, 1931 Model
     6 x 2-gun mounts on sides, evenly spread
     2 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts
      24 - 1.46" / 37.0 mm 70.0 cal guns - 1.72lbs / 0.78kg shells, 2,400 per gun
     Dual purpose guns in deck and hoist mounts, 1929 Model
     6 x 2 row quad mounts on sides, evenly spread
      6 raised mounts
      24 - 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
     12 x Twin mounts on sides, evenly spread
      12 double raised mounts
      Weight of broadside 4,602 lbs / 2,088 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   6.50" / 165 mm   400.92 ft / 122.20 m   12.57 ft / 3.83 m
   Ends:   1.38" / 35 mm   215.85 ft / 65.79 m   12.01 ft / 3.66 m
   Upper:   1.38" / 35 mm   400.92 ft / 122.20 m   12.30 ft / 3.75 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -15.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.50" / 38 mm   400.92 ft / 122.20 m   28.25 ft / 8.61 m
   Beam between torpedo bulkheads 42.65 ft / 13.00 m

   - Hull Bulges:
      0.35" / 9 mm   406.82 ft / 124.00 m   25.59 ft / 7.80 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   8.27" / 210 mm   4.72" / 120 mm      6.50" / 165 mm
   2nd:   2.56" / 65 mm   1.57" / 40 mm      1.57" / 40 mm
   3rd:   0.31" / 8 mm         -         0.31" / 8 mm
   4th:   0.31" / 8 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 4.41" / 112 mm
   Forecastle: 1.57" / 40 mm  Quarter deck: 2.76" / 70 mm

   - Conning towers: Forward 8.27" / 210 mm, Aft 1.57" / 40 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 102,209 shp / 76,248 Kw = 31.00 kts
   Range 6,328nm at 22.00 kts
   Bunker at max displacement = 5,071 tons

Complement:
   806 - 1,049

Cost:
   £6.407 million / $25.629 million

Distribution of weights at normal displacement:
   Armament: 1,103 tons, 5.8 %
      - Guns: 1,103 tons, 5.8 %
   Armour: 5,140 tons, 27.1 %
      - Belts: 1,751 tons, 9.2 %
      - Torpedo bulkhead: 627 tons, 3.3 %
      - Bulges: 136 tons, 0.7 %
      - Armament: 590 tons, 3.1 %
      - Armour Deck: 1,886 tons, 10.0 %
      - Conning Towers: 151 tons, 0.8 %
   Machinery: 2,940 tons, 15.5 %
   Hull, fittings & equipment: 5,223 tons, 27.6 %
   Fuel, ammunition & stores: 3,939 tons, 20.8 %
   Miscellaneous weights: 593 tons, 3.1 %
      - Hull below water: 61 tons
      - Bulge void weights: 160 tons
      - Hull above water: 30 tons
      - On freeboard deck: 167 tons
      - Above deck: 175 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     23,582 lbs / 10,697 Kg = 77.8 x 8.5 " / 215 mm shells or 3.6 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 2.6 ft / 0.8 m
   Roll period: 17.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.71
   Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and small transom stern
   Block coefficient (normal/deep): 0.520 / 0.530
   Length to Beam Ratio: 9.40 : 1
   'Natural speed' for length: 26.68 kts
   Power going to wave formation at top speed: 56 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   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 %,  27.56 ft / 8.40 m,  24.93 ft / 7.60 m
      - Forward deck:   30.00 %,  24.93 ft / 7.60 m,  24.93 ft / 7.60 m
      - Aft deck:   35.00 %,  14.44 ft / 4.40 m,  14.44 ft / 4.40 m
      - Quarter deck:   15.00 %,  14.44 ft / 4.40 m,  15.42 ft / 4.70 m
      - Average freeboard:      19.97 ft / 6.09 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 99.9 %
      - Above water (accommodation/working, high = better): 115.4 %
   Waterplane Area: 25,318 Square feet or 2,352 Square metres
   Displacement factor (Displacement / loading): 125 %
   Structure weight / hull surface area: 126 lbs/sq ft or 617 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.94
      - Longitudinal: 1.64
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Adequate accommodation and workspace room

The LXII design modified
-1 knot
+1% QD
Rebalance fore/aft break
= 1.09 comp hull

Adds at the citadel a 35mm upper belt,
split 1 deck high aft, and 2 decks high forward.

Adds a 35mm deck above the upper belt.

This makes a HE proof upper hull.

Armored deck is
530t    :  35mm armored
1,252t  :  40/70/70mm protective
104t    :  65mm box over magazines- flush to protective
-----
1,886t

Vertical Effective
Magazines : 152mm
Machinery : 87mm

Belt Armor
Belt (inclined) + 70mm protective deck+TDS + Magazinebox.

100% + (x*1.5/2) + 1/2 + 1/2
 
Horizontal effective at waterline
Magazines : 269 + incliined
Machinery : 236 + inclined

In other words, very very tough to kill.



Misc Wt :
120t  Const Resv

AD
100t FC
25t LR Radio
25t Searchlight Tower (NF)
25t Hulesmeyer


OD
5t  - Paravanes
32t - 2 x Quad 21" 4t

Amidships Aircraft handling area
10t : 2x Gunpowder Cat   over TT
Typically 1 loaded with the fighters, while the other
1 cycle the scouts
100t : 2 x Fighter Floatplanes, 2x Scout
20t : Hanger


HAW
15t: CO2 Compressor AC
15t : Extra Fire Suppression

HBW
15t   :  Enhanced Hydrophones.
15t   : Extra Pumps.


Decks :
 7.6   Forecastle  Deck, 35mm armored deck fore.
 4.4   Weather  Deck, 35mm Armored deck aft
 1.9   Main Deck, Top main belt, top TDS, 70mm  Protective deck
-0.6   2nd deck
             -1.8   Bottom Main Belt
-3.1   1st Deck
-7.6    Engineering
-8.66  Keel, Double Bottom

[Kaiser Kirk]

Ok, I did not think anyone would be terribly excited by those, as they are fairly close to the original.


I'll skip the Zadar 12,0000ton concept as no one seemed keen on that.

The real question is the future 10,000 ton cruisers.

These would replace the Royal Nissean series in the production sequence, and would allow
the old protected cruisers to be retired.

At 8,000tons, 12x 180mm firing 85kg shells, 125/50 armor, 30 knots the 12 Royal Nisseans were built 1923-1930, all received AA refits in 1929.5, and seem to compare well to most folks cruisers. 

A key issue is main gun.

The older 165mm was because in SS2, 165mm was near the largest gun you could toggle on 'quick firing',
AND because I was trying for 15mm breaks and 150mm, 165mm, 180mm, etc.

The presence of 7.5" / 191mm -armed Byzantine ships and fire control moving ranges out meant they did not have sufficient penetration or shell spotting.

The old 180mm fired a 80kg shell, the modern 180mm an 85kg shell.
Both were designed to be within the comfortable long term handloading guides, allowing mount & hoist.

Further, we are using 1cm = 1km shell splash can be spotted, so the 180mm could take advantage of the full 18km engagement ranges of earlier fire control.

Effectiveness, of either the 7.5", 180mm or 165mm was limited to much closer ranges, the older shells and ME just didn't penetrate as well.


Shell handling
During discussions, Jefgte indicated the French felt the 40kg shell the largest that could be sustainably hand loaded at high rates, and we already have 80-90kg as the N7 largest long rate hand load.

So when I got the last Naval Artillery tech, I looked at 40kg and 80kg as goals for shell weights.
Now, we get the max shell size for the max caliber, so really I was looking for
what gun size at 60 calibers had a 40/1.2 = 33.33kg shell, and 80/1.2=66.67kg shells.

I found my 130mm and 165mm were not far off.
So the next question was what caliber those needed for our "hey you strip the barrel if you go faster" 850mps MV. 

So I developed the 130 DP firing a 39kg shell, and 165 QF firing an 80kg shell.

While the RN essentially put their 5.25" into cramped twin semi-stalked mounts, and really didn't get them working well until quite late -  I use full 2-gun, so more interior room. 

As usual for Parthia, for any new gun/mounting type I researched 2 sets of mountings, further, I'm mostly through researching the "improved DP" version, so I don't expect the 5.25" problems to be echoed by the Parthian 130mm.

The new 115mm was the same process, for the same shell size as my 120mm gun, giving me essentially a British 4.5" DP gun - quite a decent one.

The 215mm I've already rambled on how that was a performance based gun. That can shell spot out to the horizon. Against "armored cruisers" it would need to seek night action, but could be dangerous at those lower ranges with the 180kg shell and low cross sectional area giving very good penetration.

Anyhow, 4pm, I should get back to home repair stuff. I'll post the actual ships next break.

...aha ! almost lost that post. Really am going to have to change my habit of hitting post and closing the tab.

[Kaiser Kirk]

Instead of just the two Manzikert types, I thought I would include their competitor - the 165mm gunned modified Cleveland. I used the name for a potential 6000 ton cruiser way back when,
the Bakhtiari is a type of Steppe horse, a breed developed in Persia, well adapted for long range arid environments. The Parthians probably use them in the Merican Southwest.


Anyhow, it's a rather well balanced ship I think, and the new 165 is a good weapon.
Since the main gun is quick firing, the 115 is used as the secondary.
Like the real Cleveland, the aft stern has sufficient depth for an internal hanger. 

The belt has slightly less (5mm) protection than the Royal Nissean class, but the much higher magazine protection is viewed as satisfactory.

Cleveland / Bakhtiari, Parthia Cruiser laid down 1934

Displacement:
    10,000 t light; 10,761 t standard; 12,101 t normal; 13,173 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
    (581.89 ft / 574.15 ft) x 68.90 ft x (21.85 / 23.25 ft)
    (177.36 m / 175.00 m) x 21.00 m  x (6.66 / 7.09 m)

Armament:
      12 - 6.50" / 165 mm 47.0 cal guns - 176.37lbs / 80.00kg shells, 283 per gun
      Quick firing guns in turret on barbette mounts, 1934 Model
      3 x 4-gun mounts on centreline ends, majority forward
        1 raised mount - superfiring
      12 - 4.53" / 115 mm 47.0 cal guns - 55.12lbs / 25.00kg shells, 360 per gun
      Dual purpose guns in deck and hoist mounts, 1934 Model
      4 x 2-gun mounts on side ends, evenly spread
      2 x 2-gun mounts layout not set
        2 double raised mounts
      32 - 1.18" / 30.0 mm 80.0 cal guns - 0.95lbs / 0.43kg shells, 3,160 per gun
      Anti-air guns in deck and hoist mounts, 1934 Model
      16 x 2-gun mounts on sides, evenly spread
        16 raised mounts
      Weight of broadside 2,808 lbs / 1,274 kg

Armour:
  - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    4.72" / 120 mm    373.20 ft / 113.75 m    10.20 ft / 3.11 m
    Ends:    Unarmoured
      Main Belt covers 100 % of normal length
      Main Belt inclined -15.00 degrees (positive = in)

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

  - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    6.50" / 165 mm    2.36" / 60 mm        4.72" / 120 mm
    2nd:    1.18" / 30 mm    0.98" / 25 mm        0.98" / 25 mm
    3rd:    0.31" / 8 mm          -                  -

  - Armoured deck - single deck:
    For and Aft decks: 2.46" / 63 mm
    Forecastle: 1.38" / 35 mm  Quarter deck: 2.17" / 55 mm

  - Conning towers: Forward 6.50" / 165 mm, Aft 0.00" / 0 mm

Machinery:
    Oil fired boilers, steam turbines,
    Geared drive, 4 shafts, 79,094 shp / 59,004 Kw = 31.00 kts
    Range 8,066nm at 16.00 kts
    Bunker at max displacement = 2,412 tons

Complement:
    576 - 749

Cost:
    £4.434 million / $17.738 million

Distribution of weights at normal displacement:
    Armament: 708 tons, 5.8 %
      - Guns: 708 tons, 5.8 %
    Armour: 2,445 tons, 20.2 %
      - Belts: 753 tons, 6.2 %
      - Armament: 454 tons, 3.7 %
      - Armour Deck: 1,165 tons, 9.6 %
      - Conning Tower: 74 tons, 0.6 %
    Machinery: 2,275 tons, 18.8 %
    Hull, fittings & equipment: 4,120 tons, 34.0 %
    Fuel, ammunition & stores: 2,100 tons, 17.4 %
    Miscellaneous weights: 452 tons, 3.7 %
      - Hull below water: 51 tons
      - Hull void weights: 105 tons
      - Hull above water: 30 tons
      - On freeboard deck: 95 tons
      - Above deck: 171 tons

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      16,337 lbs / 7,410 Kg = 119.2 x 6.5 " / 165 mm shells or 2.2 torpedoes
    Stability (Unstable if below 1.00): 1.08
    Metacentric height 3.3 ft / 1.0 m
    Roll period: 15.8 seconds
    Steadiness    - As gun platform (Average = 50 %): 70 %
            - Recoil effect (Restricted arc if above 1.00): 0.65
    Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
    Hull has a flush deck,
      a straight bulbous bow and small transom stern
    Block coefficient (normal/deep): 0.490 / 0.501
    Length to Beam Ratio: 8.33 : 1
    'Natural speed' for length: 25.94 kts
    Power going to wave formation at top speed: 57 %
    Trim (Max stability = 0, Max steadiness = 100): 58
    Bow angle (Positive = bow angles forward): 16.00 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 %,  27.00 ft / 8.23 m,  24.51 ft / 7.47 m
      - Forward deck:    32.50 %,  24.51 ft / 7.47 m,  22.08 ft / 6.73 m
      - Aft deck:    32.50 %,  22.08 ft / 6.73 m,  20.54 ft / 6.26 m
      - Quarter deck:    15.00 %,  20.54 ft / 6.26 m,  20.54 ft / 6.26 m
      - Average freeboard:        22.68 ft / 6.91 m

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 83.1 %
        - Above water (accommodation/working, high = better): 197.2 %
    Waterplane Area: 26,741 Square feet or 2,484 Square metres
    Displacement factor (Displacement / loading): 125 %
    Structure weight / hull surface area: 109 lbs/sq ft or 532 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0.83
        - Longitudinal: 1.70
        - Overall: 0.90
    Caution: Hull subject to strain in open-sea
    Excellent 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

Brooklynn was 18.77m for a 3T 6", so +2.25m for 4g 165?
Speed is less, so length for machinery is less, allowing the turrets closer to 'center'.

The Bahktiari class would replace the Royal Nisseans in production.

The 165L47 fires an 80kg shell vs. the older 180mm with 85kg shell.
The smaller cross-section means it carried KE better than the 180mm, for
similar or better penetration. 
The turret arrangement allows high long term sustained fire.

Spotting range for shell splashes for N7 was set at 1km per CM,
so the 165mm can be spotted out to 16.5km, while the 180 can be to 18km, and the Byzantien to 19.1km.

This does make a small 2.6km distance where the Byzantines could shell spot, and the Parthian 165mm could not. In this range, the armor should be enough to ensure no critical htis at these ranges.

Scenarios
A ) Aerial spotting, night, or poor weather...all mean spotting range irrelevant.

B ) Worst Case : the Parthian is chasing the Byzantine.  At that point the 1-2 knot overtake speed mean the Parthian would have to spend the combat where the Byzantine can target better....or the Parthian could just linger at 20-21km, and neither would have spotting.

C ) Tables are turned, Byzantine is chasing...the Parthian is faster, chooses range

D ) Byzantine turns broadside, closing speed balloons to 20-30 knots, can speed through the splash zone to where 165mm splashes count, turn shortly after and exchange telling shots.
Armor should be enough to prevent critical hits at outer ranges anyhow.

E) Parthian is fighting IJN ship. The IJN trades armor for speed, but has about the same guns. Which means if they fight, I'll punch holes in them before they punch holes in me.

Armor

Belt
1.2 to -1.8m (3m)
Outsloped 15deg

3/cos(15) = 3.1058 =3.11


Deck armor
120t  65mm  magazine box
1045t  35/55/55mm deck
------
1165t needed

1165t  paid


Protection

Magazine box forms thickened belt / deck plates

Horizontal @ Waterline
Magazine : 185 inclined
Machinery : 120 inclined

Vertical :
Magazine : 120mm
Machinery : 55mm



misc
Reserve
105t


AD
71t FC
25t LR radio
0t SR Radio
10t  RDF/Jammer
25t Searchlight tower (NF)
25t Hulesmeyer
25t Air Search Radar

OD
5t paravanes
80t 4x floatplanes
10t - 2x Catapults

HAW
20t - hanger in stern
10t Extra CO2 Air conditioning

HBW
10t Extra pumps
10t Hydrophones
31t Aux Diesel Generator


Decks
6.26  Weather Deck
3.70  Battery Deck
1.20  Main Armored Deck
-1.30 1st Platform deck
-4.80  Engineering
-5.80  Double Bottom
-6.66  Keel

[Kaiser Kirk]

The first of the Manzikert types is a better balanced design, but has a 115mm secondary vs. the 130mm secondary.

Rotation rate of the 4-gun 215mm for close in work is a concern.
It's very hard to tell if that is a valid one. We know in the night battles off Guadalcanal, the USN 8" were found lacking - but the 1st 10 were all building simultaneously with the triple mount & hoist 8", only after the first one was on trials did we see a move to turrets...which may have solved the rotation issue, we just do not know.

Plus, how often are battles a knife point expected?


For Anti-surface work, they may both be DP, but the 39kg shell is far better than the 25kg shell.
Hence the two versions.
But the move to the 130mm 39kg takes a fair bit of weight, and 'shaving' of the already tight design.

Cleveland / Bakhtiari, Parthia Cruiser laid down 1934

Displacement:
   10,000 t light; 10,761 t standard; 12,101 t normal; 13,173 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (581.89 ft / 574.15 ft) x 68.90 ft x (21.85 / 23.25 ft)
   (177.36 m / 175.00 m) x 21.00 m  x (6.66 / 7.09 m)

Armament:
      12 - 6.50" / 165 mm 47.0 cal guns - 176.37lbs / 80.00kg shells, 283 per gun
     Quick firing guns in turret on barbette mounts, 1934 Model
     3 x 4-gun mounts on centreline ends, majority forward
      1 raised mount - superfiring
      12 - 4.53" / 115 mm 47.0 cal guns - 55.12lbs / 25.00kg shells, 360 per gun
     Dual purpose guns in deck and hoist mounts, 1934 Model
     4 x 2-gun mounts on side ends, evenly spread
     2 x 2-gun mounts layout not set
      2 double raised mounts
      32 - 1.18" / 30.0 mm 80.0 cal guns - 0.95lbs / 0.43kg shells, 3,160 per gun
     Anti-air guns in deck and hoist mounts, 1934 Model
     16 x 2-gun mounts on sides, evenly spread
      16 raised mounts
      Weight of broadside 2,808 lbs / 1,274 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.72" / 120 mm   373.20 ft / 113.75 m   10.20 ft / 3.11 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length
     Main Belt inclined -15.00 degrees (positive = in)

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

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   6.50" / 165 mm   2.36" / 60 mm      4.72" / 120 mm
   2nd:   1.18" / 30 mm   0.98" / 25 mm      0.98" / 25 mm
   3rd:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.46" / 63 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 2.17" / 55 mm

   - Conning towers: Forward 6.50" / 165 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 79,094 shp / 59,004 Kw = 31.00 kts
   Range 8,066nm at 16.00 kts
   Bunker at max displacement = 2,412 tons

Complement:
   576 - 749

Cost:
   £4.434 million / $17.738 million

Distribution of weights at normal displacement:
   Armament: 708 tons, 5.8 %
      - Guns: 708 tons, 5.8 %
   Armour: 2,445 tons, 20.2 %
      - Belts: 753 tons, 6.2 %
      - Armament: 454 tons, 3.7 %
      - Armour Deck: 1,165 tons, 9.6 %
      - Conning Tower: 74 tons, 0.6 %
   Machinery: 2,275 tons, 18.8 %
   Hull, fittings & equipment: 4,120 tons, 34.0 %
   Fuel, ammunition & stores: 2,100 tons, 17.4 %
   Miscellaneous weights: 452 tons, 3.7 %
      - Hull below water: 51 tons
      - Hull void weights: 105 tons
      - Hull above water: 30 tons
      - On freeboard deck: 95 tons
      - Above deck: 171 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     16,337 lbs / 7,410 Kg = 119.2 x 6.5 " / 165 mm shells or 2.2 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 3.3 ft / 1.0 m
   Roll period: 15.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.65
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has a flush deck,
     a straight bulbous bow and small transom stern
   Block coefficient (normal/deep): 0.490 / 0.501
   Length to Beam Ratio: 8.33 : 1
   'Natural speed' for length: 25.94 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   Bow angle (Positive = bow angles forward): 16.00 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 %,  27.00 ft / 8.23 m,  24.51 ft / 7.47 m
      - Forward deck:   32.50 %,  24.51 ft / 7.47 m,  22.08 ft / 6.73 m
      - Aft deck:   32.50 %,  22.08 ft / 6.73 m,  20.54 ft / 6.26 m
      - Quarter deck:   15.00 %,  20.54 ft / 6.26 m,  20.54 ft / 6.26 m
      - Average freeboard:      22.68 ft / 6.91 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 83.1 %
      - Above water (accommodation/working, high = better): 197.2 %
   Waterplane Area: 26,741 Square feet or 2,484 Square metres
   Displacement factor (Displacement / loading): 125 %
   Structure weight / hull surface area: 109 lbs/sq ft or 532 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.83
      - Longitudinal: 1.70
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Excellent 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

Brooklynn was 18.77m for a 3T 6", so +2.25m for 4g 165?
Speed is less, so length for machinery is less, allowing the turrets closer to 'center'.

The Bahktiari class would replace the Royal Nisseans in production.

The 165L47 fires an 80kg shell vs. the older 180mm with 85kg shell.
The smaller cross-section means it carried KE better than the 180mm, for
similar or better penetration. 
The turret arrangement allows high long term sustained fire.

Spotting range for shell splashes for N7 was set at 1km per CM,
so the 165mm can be spotted out to 16.5km, while the 180 can be to 18km, and the Byzantien to 19.1km.

This does make a small 2.6km distance where the Byzantines could shell spot, and the Parthian 165mm could not. In this range, the armor should be enough to ensure no critical htis at these ranges.

Scenarios
A ) Aerial spotting, night, or poor weather...all mean spotting range irrelevant.

B ) Worst Case : the Parthian is chasing the Byzantine.   At that point the 1-2 knot overtake speed mean the Parthian would have to spend the combat where the Byzantine can target better....or the Parthian could just linger at 20-21km, and neither would have spotting.

C ) Tables are turned, Byzantine is chasing...the Parthian is faster, chooses range

D ) Byzantine turns broadside, closing speed balloons to 20-30 knots, can speed through the splash zone to where 165mm splashes count, turn shortly after and exchange telling shots.
Armor should be enough to prevent critical hits at outer ranges anyhow.

E) Parthian is fighting IJN ship. The IJN trades armor for speed, but has about the same guns. Which means if they fight, I'll punch holes in them before they punch holes in me.

Armor

Belt
1.2 to -1.8m (3m)
Outsloped 15deg

3/cos(15) = 3.1058 =3.11


Deck armor
120t   65mm  magazine box
1045t  35/55/55mm deck
------
1165t needed

1165t  paid


Protection

Magazine box forms thickened belt / deck plates

Horizontal @ Waterline
Magazine : 185 inclined
Machinery : 120 inclined

Vertical :
Magazine : 120mm
Machinery : 55mm



misc
Reserve
105t


AD
71t FC
25t LR radio
0t SR Radio
10t  RDF/Jammer
25t Searchlight tower (NF)
25t Hulesmeyer
25t Air Search Radar

OD
5t paravanes
80t 4x floatplanes
10t - 2x Catapults

HAW
20t - hanger in stern
10t Extra CO2 Air conditioning

HBW
10t Extra pumps
10t Hydrophones
31t Aux Diesel Generator


Decks
6.26   Weather Deck
3.70   Battery Deck
1.20   Main Armored Deck
-1.30 1st Platform deck
-4.80  Engineering
-5.80  Double Bottom
-6.66  Keel

[Kaiser Kirk]

The V type shaves tonnage in various areas to afford upgrading the secondary from 115 to 130mm.

Apparently Manzikert was not a horse :)  Explains why it's not on my list of Iranian horse types.

Rather it was a battle which saw Parthia defeat Byzantium and capture their Emperor in 1071 CE.

Which means some member of the class would be Carrhae, in which the Parthians destroyed 7 legions and captured one of the Triumvuriate - Marcus Crassus. Crassus had led the invasion of Parthia in search of gold. Legend had it molten gold was poured on his head to give him his wish. That was in 53 BCE, and marked the start of the Roman (Byzantine)- Parthian Wars, which in N7 last saw conflict over 2000 years later around 1876 CE, as a sideshow to the greater Alliance war against the Golden Horde.

Manzikert V, Parthia Cruiser laid down 1934

Displacement:
   10,000 t light; 10,809 t standard; 12,608 t normal; 14,047 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (555.71 ft / 547.90 ft) x 68.90 ft x (21.85 / 23.74 ft)
   (169.38 m / 167.00 m) x 21.00 m  x (6.66 / 7.24 m)

Armament:
      8 - 8.46" / 215 mm 47.0 cal guns - 396.83lbs / 180.00kg shells, 170 per gun
     Breech loading guns in turret on barbette mounts, 1934 Model
     2 x 4-gun mounts on centreline ends, evenly spread
      12 - 5.12" / 130 mm 47.0 cal guns - 85.98lbs / 39.00kg shells, 360 per gun
     Dual purpose guns in deck and hoist mounts, 1934 Model
     4 x 2-gun mounts on side ends, evenly spread
     2 x 2-gun mounts layout not set
      2 raised mounts
      32 - 1.18" / 30.0 mm 80.0 cal guns - 0.95lbs / 0.43kg shells, 3,000 per gun
     Breech loading guns in deck and hoist mounts, 1934 Model
     16 x 2-gun mounts on sides, evenly spread
      12 raised mounts
      Weight of broadside 4,237 lbs / 1,922 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.94" / 100 mm   356.14 ft / 108.55 m   12.24 ft / 3.73 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

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

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   6.50" / 165 mm   2.17" / 55 mm      4.92" / 125 mm
   2nd:   0.98" / 25 mm   0.98" / 25 mm      0.98" / 25 mm
   3rd:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.26" / 58 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 1.97" / 50 mm

   - Conning towers: Forward 4.72" / 120 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 74,520 shp / 55,592 Kw = 30.00 kts
   Range 8,044nm at 18.00 kts
   Bunker at max displacement = 3,238 tons

Complement:
   594 - 773

Cost:
   £4.853 million / $19.413 million

Distribution of weights at normal displacement:
   Armament: 1,013 tons, 8.0 %
      - Guns: 1,013 tons, 8.0 %
   Armour: 2,262 tons, 17.9 %
      - Belts: 725 tons, 5.7 %
      - Armament: 411 tons, 3.3 %
      - Armour Deck: 1,070 tons, 8.5 %
      - Conning Tower: 55 tons, 0.4 %
   Machinery: 2,144 tons, 17.0 %
   Hull, fittings & equipment: 4,199 tons, 33.3 %
   Fuel, ammunition & stores: 2,608 tons, 20.7 %
   Miscellaneous weights: 383 tons, 3.0 %
      - Hull below water: 51 tons
      - Hull void weights: 70 tons
      - Hull above water: 20 tons
      - On freeboard deck: 65 tons
      - Above deck: 177 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     16,910 lbs / 7,670 Kg = 55.8 x 8.5 " / 215 mm shells or 2.2 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 3.5 ft / 1.1 m
   Roll period: 15.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.86
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has a flush deck,
     a straight bulbous bow and small transom stern
   Block coefficient (normal/deep): 0.535 / 0.549
   Length to Beam Ratio: 7.95 : 1
   'Natural speed' for length: 25.32 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   Bow angle (Positive = bow angles forward): 16.00 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 %,  27.23 ft / 8.30 m,  24.77 ft / 7.55 m
      - Forward deck:   25.00 %,  24.77 ft / 7.55 m,  22.31 ft / 6.80 m
      - Aft deck:   40.00 %,  22.31 ft / 6.80 m,  22.31 ft / 6.80 m
      - Quarter deck:   15.00 %,  22.31 ft / 6.80 m,  22.31 ft / 6.80 m
      - Average freeboard:      23.31 ft / 7.10 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 83.4 %
      - Above water (accommodation/working, high = better): 194.4 %
   Waterplane Area: 26,613 Square feet or 2,472 Square metres
   Displacement factor (Displacement / loading): 124 %
   Structure weight / hull surface area: 116 lbs/sq ft or 565 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.82
      - Longitudinal: 2.00
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Warning: Beam between bulkheads too wide

Designed to try to fit the Xiyon light armored cruiser armanent into a regular cruiser.

Turret rotation for short ranges is probably not the best. As a full turret, should still be better than Pensacola - which had a narrower beam, lesser BC, longer machinery spaces, and "A" turret, while this is basically B and X

After the USN built that first series of 10 Heavy Cruisers (last laid before first completed trials), they went to turrets for the 8/55. To compensate, a heavy 130mm secondary is fitted, with 3 mounts fore/aft and  4 mounts broadside, for fairly good light fire.

With the belief that most engagement ranges will be longer, this would allow effective engagement to the edge of visual range. Hulls can be seen at about 18km, masts out to about 21km- as I recall. Some sources are meters, some are yards and that gets mixed up in memory.

In either case, the belt armor will be less important, the deck armor more important.
So the thinner belt with an armored magazine box means the magazines have 165mm H and 115mVert protection.

 The heavy shell will be a good deck penetrator, but also carries kinetic energy well, making a good belt penetrator at those ranges. This should allow this ship to destroy normal cruisers when encountered, while posing a threat to beyond visual range compatents due to the deck penetration.

1.1m beamier with better BC, and only 2 main battery turrets, than USS Pensacola.

Armor
A magazine box forms thicker belt/deck plates

Horizontal @ Waterline
Magazines : 165 + incline
Machinery : 100 + incline

Vertical
Magazines : 115mm
Machinery : 50mm


Belt Armor
Covers from 1.9m to -1.7m
Outsloped 15 degrees
3.6/cos(15) = 3.7269 = 3.73

Machinery : 100mm outsloped
Magazines : 65mm+ 100mm outsloped

Deck armor
119t   65mm  magazine box
951t  35/50/50mm deck
------
1070t

1070t paid



Misce

Reserve
70t

AD
102   FC
25t   LR radio
0t  -  SR Radio
25t - Hulesmeyer
25t - Searchlight Tower (NF)

OD
5t paravanes
50t - 2x floatplanes
10t - 2x Catapults

HBW -
10t  - hanger in stern
10t - CO2 Compressor AC

HBW
10t - Ex Fire Ext
10t - Ex Pumps
31t - Auxiliary Diesel Generator 1000kw


Decks
+6.80 Weather Deck
+4.35 Battery Deck
+1.90 Armor Deck, main deck
-0.60  1st Platform Deck
-4.10   Engineering
-5.68 Double Bottom
-6.66  Keel

[Kaiser Kirk]

Still exploring 1934 designs.
I have 8 smaller carriers with the fleet, providing fighter defenses, and a training carrier.

So I was looking to start fielding larger carriers with a strike capability, but I am starting to have second thoughts about investing in  Only big carriers and abandoning further smaller platforms.

For this period, I still like the flying off deck of my Kam Baz class. The time period/tech for this carrier is like USS Ranger - which dispensed with torpedo planes and torpedo storage as they were thinking dive bombers would be enough. Which for the role of slowing the enemy, or putting a hole in carrier deck, is probably correct.

That also means lighter planes that can still benefit from the flying off deck. Eventually I'll have to reconstruct this series of ships and rebuild the forecastle, probably using bulges for a deck park at that time as well.

As presented it's 2 full fighter groups and 1/2 a Scout-Bomber group.
I think that give launch and servicability rates, 1.5 fighter and 1 Scout-Bomber might be a better mix.

Kam Baz - Little Hawk V, Parthian Kestrel  Flight Deck Carrier laid down 1934

Displacement:
   15,001 t light; 15,778 t standard; 17,407 t normal; 18,711 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (623.36 ft / 616.80 ft) x 68.90 ft x (29.56 / 31.16 ft)
   (190.00 m / 188.00 m) x 21.00 m  x (9.01 / 9.50 m)

Armament:
      16 - 5.12" / 130 mm 50.0 cal guns - 85.98lbs / 39.00kg shells, 360 per gun
     Dual purpose guns in casemate mounts, 1931 Model
     8 x Single mounts on sides, evenly spread
      8 hull mounts in casemates- Limited use in heavy seas
     8 x Single mounts on sides, evenly spread
      8 hull mounts in lower casemates- Limited use in heavy seas
      8 - 5.12" / 130 mm 5.0 cal guns - 63.93lbs / 29.00kg shells, 360 per gun
     Anti-air guns in deck and hoist mounts, 1931 Model
     8 x Single mounts on sides, evenly spread
      16 - 1.46" / 37.0 mm 70.0 cal guns - 1.73lbs / 0.78kg shells, 1,500 per gun
     Anti-air guns in deck and hoist mounts, 1929 Model
     4 x 4-gun mounts on side ends, evenly spread
      24 - 0.91" / 23.0 mm 90.0 cal guns - 0.43lbs / 0.20kg shells, 5,000 per gun
     Machine guns in deck mounts, 1929 Model
     12 x Twin mounts on sides, forward deck forward
      12 raised mounts
      Weight of broadside 1,925 lbs / 873 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Ends:   Unarmoured

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.50" / 38 mm   400.92 ft / 122.20 m   28.84 ft / 8.79 m
   Beam between torpedo bulkheads 50.52 ft / 15.40 m

   - Hull void:
      0.00" / 0 mm     0.00 ft / 0.00 m   29.53 ft / 9.00 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: 1.97" / 50 mm

   - Conning towers: Forward 1.97" / 50 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 73,742 shp / 55,012 Kw = 29.00 kts
   Range 7,876nm at 16.00 kts
   Bunker at max displacement = 2,933 tons

Complement:
   757 - 985

Cost:
   £4.393 million / $17.571 million

Distribution of weights at normal displacement:
   Armament: 271 tons, 1.6 %
      - Guns: 271 tons, 1.6 %
   Armour: 1,549 tons, 8.9 %
      - Torpedo bulkhead: 640 tons, 3.7 %
      - Armament: 26 tons, 0.2 %
      - Armour Deck: 855 tons, 4.9 %
      - Conning Tower: 28 tons, 0.2 %
   Machinery: 2,121 tons, 12.2 %
   Hull, fittings & equipment: 6,590 tons, 37.9 %
   Fuel, ammunition & stores: 2,407 tons, 13.8 %
   Miscellaneous weights: 4,469 tons, 25.7 %
      - Hull below water: 2,251 tons
      - Hull void weights: 85 tons
      - Hull above water: 1,930 tons
      - On freeboard deck: 65 tons
      - Above deck: 138 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     36,491 lbs / 16,552 Kg = 544.4 x 5.1 " / 130 mm shells or 4.6 torpedoes
   Stability (Unstable if below 1.00): 1.15
   Metacentric height 3.7 ft / 1.1 m
   Roll period: 15.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.25
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has low forecastle,
     a ram bow and small transom stern
   Block coefficient (normal/deep): 0.485 / 0.495
   Length to Beam Ratio: 8.95 : 1
   'Natural speed' for length: 26.81 kts
   Power going to wave formation at top speed: 52 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   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): 99.0 %
      - Above water (accommodation/working, high = better): 283.3 %
   Waterplane Area: 28,597 Square feet or 2,657 Square metres
   Displacement factor (Displacement / loading): 159 %
   Structure weight / hull surface area: 101 lbs/sq ft or 493 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.81
      - Longitudinal: 6.48
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Warning: Wrong mount for dual purpose gun - Main Battery

The Kam Baz modified for 1934
widens and lengthens the hull.

This also introduces the tansom stern, a single island, a unified waterline-to-deck battery. This necessitated a slight increase in draft. The armored box around mag & machinery is replaced by a conventional protective deck as that provides better short range protection at night and makes the entire citadel bomb proof 


32 x Fighter, 2 Groups of 16, - one in the upper and one in the lower hangers.
8 x Scout/Dive bomber, 1/2 Group


Flight Calculations
1934 onwards aircraft.

Double Hanger : wp/65
2657/65=40.87 possible

40 planes carried
x
95 tons / plane = 3800 tons needed.

HAW = 1900
HBW = 1900

Freeboards
It is expected that the 3m deck heights of carriers is in reality 6m lighter structures. Placing the flying off deck at 12m and flight deck at 18m.


Fuel :
Parthian fleet cruise speed is currently about 14knts for 6-8000nm.
Vessels expected to operate in support of the fleet - movng around the main body- have a cruise speed of 16 knots.
This both allows destroyers to sprint and drift in an ASW role, and carriers to move off, launch into the wind, and then come about and catch up with the formation.

Weaponry

Double Stacked Casements along the hanger sides.

The 23mm are on platforms on the 'H" towers.

         37mm&130mm - deck edge
          [ 130mm - upper hanger
          [ 130mm - lower hanger
   6m- |
3.5m- |
1.0m- | Armor deck
-1.5m | Bottom of Belt

Armor
The deck heights place thecrown of the protective deck at a mere 1.0m above the
waterline, with the lower edge at -1.5m
This is meant to defeat HE and SAP rounds from light guns, and preserve the carriers ability to manuever and fight.

The 38mm TDS 2.7 m inside the hull, which is expected to be marginal at stopping surface or submarine torpedoes, but should handle lighterweight aerial torpedoes. Even if the bulkhead leaks, it should decouple the shock wave and limit flooding.
Torpedo nets are retained as a defense against aerial torpedoes.

Misc Weight
Reserve :
85t

AD
28t-  Fire Control 1930
25t-  Hulesmeyer
25t- Searchlights (NF)
25t - Air Search Radar
25t-  LR Radio
10t-  SR Radio - Air Command
  0t-  SR Radio

OD
  5t  - Paravanes
30t -  2 x hydraulic catapults flight deck
30t - 2 x hydraulic catapults flying off deck

HAW
1900t - Airgroup
15t -  Additional Ventilation
15t -  Additional Fire Suppresion.

HBW
1900t- Airgroup
15t - Additional Fire Suppression
15t - Additional pumps
70t - additional fuel in doublewall tanks (63:7)
30t - additional  munitions
190t - Torpedo Nets.
31t - Auxiliary Diesel Generator

Decks :
18m - Upper Flight Deck - 37 &  130mm guns
12m - 2nd Hanger Deck - Flying off deck - 130mm guns
 6.00  1st Hanger Deck - 130mm guns
 3.50   Battery Deck -
 1.00   Armored Main deck, Top of Belt
-1.50  2nd Deck, bottom belt, lower edge of fore/aft PD.
-4.00  1st Deck
-6.50  Engineering
-8.79  Double Bottom
-9.01  Keel

[Kaiser Kirk]

Maritime Patrol Vessels

A category of vessels the Parthians have indulged in is our Maritime Patrol Frigates.

Starting as a matter of historical continuity, the Artesmia class were armored Sailing Frigates. They were followed by the Artesmia II (Atossa) class, then the Sayidda Class.

4 of the Artesmia have been retained as tall ship training vessels, while 16 of the Atossa/Sayidda classes exist.

The conceptual idea were ships to patrol the worldwide high sea lanes and show the flag for minimal cost. The only combatants might be AMCs or piratical vessels, or perhaps enemy light cruisers cheap and long ranged enough to send raiding.  If the foe lacks any such vessels, then these could become aggressors.

The reserve role was to serve as screeners for the main fleet, being able to engage torpedo armed combatants.

In 1935-36 (I can't afford in 1934) I will probably start laying down a successor class.
Either the Atossa proper, Tomyris or Boran.

The question is...how big?

3000t was always very lean.

4300t ish produces a good light vessel,  1/3 larger, with a fair powerful 4x 165 main battery.
Seakeeping and range is good, and speed is high enough they will not easily be run down.

5300tons would be at the outer limits of what I might call a frigate.
The two-gun mounts get power assist, but it's a fairly useful vessel.

BUT for a mere 700 tons more...I get a very decent cruiser,
and well balanced too.

Except....now my vessel has grown from 3000tons to 6000tons. 
Which is what my cruisers cost into the mid 1920s.

4300t  4 x 165mm, 8x90DP,  Brig, 1x Scoutplane,  75B 35D, 30knots
5300t  6 x 165mm, 8x90DP,  Brig, 1x Scoutplane, 100B 35D, 30knots

6000t  8 x 165mm, 16x 21" Torpedo, Marine Section, Brig, 1x Scoutplane, 120B 40D, 30knots
The cruiser is also a little longer and so doesn't fit merchant drydocks (141m).
It also drops the 90DP armanent. Not sure how useful barrage fire would be for a solo vessel.
Has good AAMGs though.

So what's a reasonable price point for a Maritime patrol cruiser ?

[Kaiser Kirk]

Looking at the Sayidda, they are meant to be USS Omaha analogs, featuring a mixture of two-gun mounts and casements. Good speed, extremely weak protection.

So I decided to expand the smallest design - the Atossa - to 4500 tons, 50% more than the Sayidda.
That still is far more affordable than a 6000 tonner, and does the basic role just as well.

The main guns 'seem' weaker, with 4 guns vs. 8, but
The new 165L47 is a much better gun with heavier round.
Further, the 2-gun mounts would be slightly slower than singles, and the casements only bear on limited arcs. In terms of weight of fire, this works out to about 82% of the Sayidda's.
 
However, armor is extremely better, there are 90mm DP guns in place of the casement guns, and the AAMG is heavier.

Several different over-the horizon search apparatus are fitted - Planes, hydrophones, direction finders etc, allowing it to be a better patrol vessel.

Atossa, Parthian Maritime Patrol Frigate laid down 1935

Displacement:
   4,500 t light; 4,826 t standard; 5,595 t normal; 6,211 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (462.30 ft / 452.76 ft) x 49.21 ft x (15.42 / 16.75 ft)
   (140.91 m / 138.00 m) x 15.00 m  x (4.70 / 5.10 m)

Armament:
      4 - 6.50" / 165 mm 47.0 cal guns - 176.37lbs / 80.00kg shells, 188 per gun
     Quick firing guns in deck and hoist mounts, 1935 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      8 - 3.54" / 90.0 mm 54.0 cal guns - 24.25lbs / 11.00kg shells, 600 per gun
     Dual purpose guns in deck and hoist mounts, 1935 Model
     4 x 2-gun mounts on side ends, evenly spread
      24 - 1.46" / 37.0 mm 70.0 cal guns - 1.73lbs / 0.79kg shells, 2,600 per gun
     Anti-air guns in deck and hoist mounts, 1935 Model
     4 x 2 row quad mounts on side ends, evenly spread
      4 raised mounts
     2 x 2 row quad mounts on centreline ends, evenly spread
      2 double raised mounts
      16 - 0.91" / 23.0 mm 90.0 cal guns - 0.44lbs / 0.20kg shells, 4,000 per gun
     Anti-air guns in deck mounts, 1935 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 948 lbs / 430 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.95" / 75 mm   298.82 ft / 91.08 m   11.91 ft / 3.63 m
   Ends:   Unarmoured
     Main Belt covers 102 % of normal length
     Main Belt inclined -15.00 degrees (positive = in)

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

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.54" / 90 mm   1.18" / 30 mm      2.95" / 75 mm
   2nd:   0.98" / 25 mm   0.98" / 25 mm      0.98" / 25 mm
   3rd:   0.79" / 20 mm   0.31" / 8 mm      0.31" / 8 mm
   4th:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 1.54" / 39 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 1.38" / 35 mm

   - Conning towers: Forward 3.94" / 100 mm, Aft 1.38" / 35 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 49,219 shp / 36,718 Kw = 30.00 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 1,385 tons

Complement:
   323 - 420

Cost:
   £2.249 million / $8.998 million

Distribution of weights at normal displacement:
   Armament: 255 tons, 4.6 %
      - Guns: 255 tons, 4.6 %
   Armour: 1,024 tons, 18.3 %
      - Belts: 437 tons, 7.8 %
      - Armament: 94 tons, 1.7 %
      - Armour Deck: 458 tons, 8.2 %
      - Conning Towers: 36 tons, 0.6 %
   Machinery: 1,398 tons, 25.0 %
   Hull, fittings & equipment: 1,566 tons, 28.0 %
   Fuel, ammunition & stores: 1,096 tons, 19.6 %
   Miscellaneous weights: 257 tons, 4.6 %
      - Hull below water: 20 tons
      - Hull void weights: 52 tons
      - Hull above water: 52 tons
      - On freeboard deck: 42 tons
      - Above deck: 91 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5,666 lbs / 2,570 Kg = 41.3 x 6.5 " / 165 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.12
   Metacentric height 2.1 ft / 0.6 m
   Roll period: 14.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.65
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and small transom stern
   Block coefficient (normal/deep): 0.570 / 0.583
   Length to Beam Ratio: 9.20 : 1
   'Natural speed' for length: 22.81 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   Bow angle (Positive = bow angles forward): 22.00 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 %,  23.62 ft / 7.20 m,  21.16 ft / 6.45 m
      - Forward deck:   32.50 %,  21.16 ft / 6.45 m,  18.70 ft / 5.70 m
      - Aft deck:   33.50 %,  18.70 ft / 5.70 m,  17.72 ft / 5.40 m
      - Quarter deck:   14.00 %,  17.72 ft / 5.40 m,  17.72 ft / 5.40 m
      - Average freeboard:      19.49 ft / 5.94 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 100.2 %
      - Above water (accommodation/working, high = better): 182.5 %
   Waterplane Area: 16,239 Square feet or 1,509 Square metres
   Displacement factor (Displacement / loading): 114 %
   Structure weight / hull surface area: 62 lbs/sq ft or 304 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.68
      - Longitudinal: 1.73
      - Overall: 0.75
   Caution: Hull subject to strain in open-sea
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

Warning: Beam between bulkheads too wide

Names for a Scythian Queen who legendarily defeated and slew Cyrus the Great.

The newest in a long line of patrol frigates to police the seas.

Designed for long range deep ocean travel, seakeeping is good.

The overall length of 141 meters is designed to match a common merchant length and so be able to use dock and repair facilities world wide.

The opposition is expected to be pirates or armed merhant cruisers.
During wartime, the patrol frigates are expected to act in a commerce protectio or raiding role as well.
To assist the latter, 6 x 18" TT are fitted, allowing merchants to be sunk by torpedo.
The two fire teams of Marines are meant to lead boarding parties for any role.
The Brig allows pirates or smugglers to be secured.

The scout plane, Radio Direction Finder, and Enhanced Hydrophones are all meant to expand the potential search range to allow the vessel to be more effective.

The armor is optimized for short range, with a reversion to a protected deck shielded by an armored belt.

In extremis, should the fleet be depleted by war losses, the class would be pressed into service as escorts and skirmishers. The vessel should be very capable against smaller combatants.

Protection
Armored Belt and Protective Deck
Magazine Box.

Horizontal Waterline Protection :
(Belt + ((PD+Box)*1.5/2)
Magazine : 128mm
Machinery : 101mm

Vertical Protection :
Magazine : 70mm
Machinery : 35mm


Belt
+2m to -1.5m
Inclined 15 degrees
3.5 cos (15) = 3.623 = 3.63

Belt Rises to +2m, or 1.5m above slopes of protective deck to guard against shells diving over.
Belt descend -1.5m below waterline

Deck
35mm Protective Deck full length
35mm magazine box - Sides and Roof thicken Protective deck.

417t - Deck
40t - Box
---
457t - needed
457t - paid

Misc
Resv : 56t

AD :
26t - Fire Control 1930
25t - LR Radio
0t - SR Radio
10t - RDF / Jammer
25t- Hulesmeyer Prox detector.
5t - Night fighting gear

OD:
5t - Paravanes
12t - 2TT3 18"
20t - Scout Floatplane
5t - Catapult


HAW:
5t - CO2 compressor AC
5t - Extra Fire Ext

10t - Brig
32t - Marine Boarding Teams (8)

HBW:
5t - Extra Pumps.
15t - Hydrophones


Decks

+5.40  Weather Deck
+2.95  Battery Deck
    +2.0  Top Main Belt
+0.50  Main Protective Deck
     -1.50  Bottom Main Belt
-1.95   1st Platform Deck, lower edge protective deck
-4.37    Engineering
-4.70    Keel.

[Jefgte]

They look like Byzantine AGB4650 from 1897-refurb. 1921...scraped in 1933H2.
Economical for the colonies and able to support the fleet cruisers.

[Kaiser Kirk]

They look like Byzantine AGB4650 from 1897-refurb. 1921...scraped in 1933H2.
Economical for the colonies and able to support the fleet cruisers.

Your little cruisers have been something I have paid attention to.
Part of why I upgunned with the Sayidda Class.