Parthian vessels 1937 - 1940

[Kaiser Kirk]

The Bazdari class was one of the 'deliberate' mistakes I make at times.
The class was short and slow and would not age well.
Designed to mimic HMS Hermes, they were the first post-experimental carriers,
and really meant to carry biplanes. Even the heavy Fairey Swordfish could operate from Escort carriers due to their biplane configuration giving a very large wing area and very low wing loading, allowing short runs and landings even loaded. However the main focus was and is fighters.

So the refurbished ones will launch groups of fighters as fleet defenses, trailing the 26knot battleline.

Refurbishment will cost $10.5, 4.91 per hull - very expensive.
However much of that is my choosing to pay for 'Functional Misc Wt' to redo the Air group.
Technically, that's not needed, as the airgroup upgrades automatically.
But practically, I think given the transition from mid 1920s biplanes to 1938-39 monoplanes, with 1940-41 planes being researched, that type of expense is probably warranted. Call it new elevators, new catapults, new arresting gear, all-new workshops, new arms lockers, etc.

CVF Bazdari  BR39, Parthian Fighter Carrier laid down 1925 (Engine 1939)

Displacement:
   10,478 t light; 10,979 t standard; 12,610 t normal; 13,914 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (524.93 ft / 518.37 ft) x 59.06 ft x (22.15 / 24.09 ft)
   (160.00 m / 158.00 m) x 18.00 m  x (6.75 / 7.34 m)

Armament:
      12 - 5.12" / 130 mm 49.0 cal guns - 85.98lbs / 39.00kg shells, 280 per gun
     Dual purpose guns in casemate mounts, 1930 Model
     12 x Single mounts on sides, evenly spread
      12 hull mounts in casemates- Limited use in heavy seas
      8 - 3.54" / 90.0 mm 54.0 cal guns - 24.25lbs / 11.00kg shells, 300 per gun
     Dual purpose guns in deck and hoist mounts, 1930 Model
     4 x Single mounts on side ends, evenly spread
      16 - 1.46" / 37.0 mm 70.0 cal guns - 1.72lbs / 0.78kg shells, 2,400 per gun
     Anti-air guns in deck mounts, 1929 Model
     4 x 2 row quad mounts on sides, evenly spread
      16 - 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
     6 x Twin mounts on sides, evenly spread
     2 x Twin mounts on sides, forward deck centre
      2 double raised mounts
      Weight of broadside 1,260 lbs / 572 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.15" / 80 mm   336.94 ft / 102.70 m   11.75 ft / 3.58 m
   Ends:   1.38" / 35 mm   181.40 ft / 55.29 m   11.75 ft / 3.58 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -12.00 degrees (positive = in)

   - Hull void:
      0.00" / 0 mm   400.26 ft / 122.00 m   18.86 ft / 5.75 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:   0.79" / 20 mm   0.31" / 8 mm      0.79" / 20 mm
   3rd:   0.79" / 20 mm         -               -
   4th:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 1.57" / 40 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 1.57" / 40 mm

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 56,176 shp / 41,907 Kw = 27.00 kts
   Range 7,616nm at 18.00 kts
   Bunker at max displacement = 2,934 tons

Complement:
   594 - 773

Cost:
   £2.128 million / $8.512 million

Distribution of weights at normal displacement:
   Armament: 256 tons, 2.0 %
      - Guns: 256 tons, 2.0 %
   Armour: 1,422 tons, 11.3 %
      - Belts: 632 tons, 5.0 %
      - Armament: 76 tons, 0.6 %
      - Armour Deck: 682 tons, 5.4 %
      - Conning Towers: 32 tons, 0.3 %
   Machinery: 1,520 tons, 12.1 %
   Hull, fittings & equipment: 3,975 tons, 31.5 %
   Fuel, ammunition & stores: 2,131 tons, 16.9 %
   Miscellaneous weights: 3,306 tons, 26.2 %
      - Hull below water: 1,465 tons
      - Hull void weights: 246 tons
      - Hull above water: 1,374 tons
      - On freeboard deck: 55 tons
      - Above deck: 166 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     24,992 lbs / 11,336 Kg = 372.8 x 5.1 " / 130 mm shells or 2.5 torpedoes
   Stability (Unstable if below 1.00): 1.22
   Metacentric height 3.3 ft / 1.0 m
   Roll period: 13.7 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 a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.651 / 0.660
   Length to Beam Ratio: 8.78 : 1
   'Natural speed' for length: 22.77 kts
   Power going to wave formation at top speed: 57 %
   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 %,  29.53 ft / 9.00 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:      29.53 ft / 9.00 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 71.2 %
      - Above water (accommodation/working, high = better): 222.2 %
   Waterplane Area: 23,473 Square feet or 2,181 Square metres
   Displacement factor (Displacement / loading): 149 %
   Structure weight / hull surface area: 85 lbs/sq ft or 417 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.84
      - Longitudinal: 4.47
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

1939 Refurbishment

Designed in 1925 to provide biplane fighter coverage an aerial scouting for the battlefleet, by 1939 it was sorely outdated.

- Remove "H" tower structure, replace with 1 streamlined tower.
- Replace armanent (172 main mag)
- Replace Engines (Original 1565)
- New cruising turbines (Original Bunkers 2934)
- Replace Airgroup & fittings (original 2640)
- Replace miscellaneous fittings
- add Air-Search Radar, add Aux Diesel
- remove Torpedo nets

The maximum new engines can make the vessel go is 27.198knots.
The difference between that and 26knots is 260tons.
So 27 knots is the new engine design.

Costs :
Baseline : 10.5 * 0.2 = $2.1
A : 256+1520 = $3.552  , 1.776bp
B : 76+3060 = $3.136 , 3.136bp
C : no hull alteration
D :  2,934+249+246 =  3429/2000= $1.7145

Subtotal : $10.5025, 4.91bp
Total :     $10.5 , 4.91


Airgroup :
2181 / 77 = 28.32

28 * 95 = 2660  (1330 / 1330 )

1 Sqdn Fighters - 16+1 spare
1 Talon Scout/Bombers - 8+1 spare
2 Mail Planes



The Bazdari (Falconeer)


Belt covers from +2.5 to -1.0.
The shallow depth is felt acceptable
as combat is foreseen as short range.

The belt is outsloped 12 degrees
3.5 / cos(12) = 3.58

A heavy deck is fitted for both
splinter protection (up to 240) and to thwart lucky long range hits.

The upper works, save for the Casement enclosures, are unarmored, as an AoN effort.

Misc Wt :
Reserve : 246t

AD
26t - FC
25t - LR Radio
0t - SR Radio
10t - SR Dedicated AC Channel
10t-  SR EW room.
25t - Night Fighting / Searchlights
25t - Hulesmeyer proximity detector
25t - Air Search Radar
10t - Dedicated AC channel
10t - Squadron Plot room


OD
5t - Paravanes
50t - 2x hydraulic catapults

HAW
1330 Airgroup

11t - CO2 Compressor AC
22t - Forced Fume extraction
11t - Additional Fire Suppression

HBW
1330 Airgroup

11t - Additional fire suppression
36t - 30t AvGas in 6t doublewall tanks
36t - 30t AvGas in 6t doublewall tanks
10t- Additional fighter/scout munitions

11t - Additional pumps
31t - Auxiliary Diesel 500kw 116nm fuel

Decks
9: Flight Deck
           6.5m high hanger
2.5: Armor Deck, Battery Deck (Casements)
-1.0 : Bottom Armor Belt
-2.5 :
-6.0 : Engineering
-6.49 : Double bottom
-6.75 : Keel

[Kaiser Kirk]

A new 1939 design.

Buildable in 24months.
Meant as a Fighter Carrier able to keep up with other carriers and cruisers.
At half the cost of the 'Strike Carriers'  it will both provide the CAP and local defense, allowing the 'Strike Carriers' to launch cohesive strikes.

Deck Park :
I'm still not building deck parks into the designs, I probably should.
But this ship is designed around the idea of providing a fighter launcher.
I expect I will refit this at somepoint, add bulges, thus slowing it down,
but allowing me to add the miscellaneous weight for the deck park.

Armor Scheme is a real question on this one.

pure Armored Box 75mm is 1105t

50mm belt and deck is 1393t.


This version combines a 60mm Armored Box over machinery and magazines with a minimal 2m deep TDS.  The TDS is carried 1m above the WL
This is meant to defeat aerial bombs and torpedoes.

The ends are left 'soft', as is the superstructure.

The Box (from prior exploration is 3m high) would extend from
+1 m above WL to -2m below WL, while not capping the TDS.
The TDS likely is immediately in front of the sides of the box.

Zambur "Bee", Parthian  Flight Deck Carrier laid down 1939

Displacement:
   15,000 t light; 15,547 t standard; 17,647 t normal; 19,326 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (623.11 ft / 613.52 ft) x 75.46 ft x (21.85 / 23.53 ft)
   (189.92 m / 187.00 m) x 23.00 m  x (6.66 / 7.17 m)

Armament:
      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, 1939 Model
     8 x Single mounts on side ends, evenly spread
      16 - 1.46" / 37.0 mm 70.0 cal guns - 1.72lbs / 0.78kg shells, 3,200 per gun
     Anti-air guns in deck mounts, 1939 Model
     8 x 2-gun mounts on sides, evenly spread
      20 - 0.91" / 23.0 mm 70.0 cal guns - 0.42lbs / 0.19kg shells, 5,000 per gun
     Anti-air guns in deck mounts, 1939 Model
     10 x Twin mounts on side ends, majority forward
      Weight of broadside 724 lbs / 328 kg

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

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.50" / 38 mm   398.79 ft / 121.55 m   23.98 ft / 7.31 m
   Beam between torpedo bulkheads 62.34 ft / 19.00 m

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

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm   0.31" / 8 mm      0.79" / 20 mm
   2nd:   0.79" / 20 mm         -               -
   3rd:   0.31" / 8 mm         -               -

   - Box over machinery & magazines:
   2.36" / 60 mm

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 104,208 shp / 77,740 Kw = 31.00 kts
   Range 7,930nm at 18.00 kts
   Bunker at max displacement = 3,779 tons

Complement:
   765 - 995

Cost:
   £5.698 million / $22.792 million

Distribution of weights at normal displacement:
   Armament: 182 tons, 1.0 %
      - Guns: 182 tons, 1.0 %
   Armour: 1,474 tons, 8.4 %
      - Torpedo bulkhead: 529 tons, 3.0 %
      - Armament: 31 tons, 0.2 %
      - Armour Deck: 884 tons, 5.0 %
      - Conning Tower: 29 tons, 0.2 %
   Machinery: 2,819 tons, 16.0 %
   Hull, fittings & equipment: 5,805 tons, 32.9 %
   Fuel, ammunition & stores: 2,647 tons, 15.0 %
   Miscellaneous weights: 4,720 tons, 26.7 %
      - Hull below water: 2,106 tons
      - Hull void weights: 340 tons
      - Hull above water: 2,055 tons
      - On freeboard deck: 55 tons
      - Above deck: 164 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     33,302 lbs / 15,106 Kg = 496.8 x 5.1 " / 130 mm shells or 4.2 torpedoes
   Stability (Unstable if below 1.00): 1.35
   Metacentric height 5.6 ft / 1.7 m
   Roll period: 13.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 76 %
         - Recoil effect (Restricted arc if above 1.00): 0.10
   Seaboat quality  (Average = 1.00): 1.69

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and small transom stern
   Block coefficient (normal/deep): 0.611 / 0.621
   Length to Beam Ratio: 8.13 : 1
   'Natural speed' for length: 26.64 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   Bow angle (Positive = bow angles forward): 18.00 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 %,  29.53 ft / 9.00 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:      29.53 ft / 9.00 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 99.4 %
      - Above water (accommodation/working, high = better): 257.8 %
   Waterplane Area: 35,066 Square feet or 3,258 Square metres
   Displacement factor (Displacement / loading): 142 %
   Structure weight / hull surface area: 103 lbs/sq ft or 503 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 2.39
      - 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





The Parthian Fighter Carriers are meant to be decks to provide CAP and interdiction platforms.

Two fighter groups of 16 planes each are normally carried.
The alternate airgroup is 16 fighters and 16 bombers.
For this vessel, it is intended a half group of 8 bomber/scouts will be carried as well.
1 mail plane will also be carried.

32 Fighters
8  Reconnaisance planes
1 Mail Plane.
------
41 planes total desired.

Deck park potential unallocated miscellaneous weight.


Flight Calculations
9m FD = 1 hanger
Single Hanger : wp/77 = 3258/77 = 42.3116 max
42 max @ 95 tons/plane = 3990t
3990/2 = 1995


Misc Weight
Reserve :
340t

AD
19t-  Fire Control 1930
25t-  Hulesmeyer
25t - Air Search Radar
25t - Sea Search Radar
10t - Landing Assistance Lights
25t- Searchlights (NF)
25t-  LR Radio
10t-  SR Radio - Air Command
  0t-  SR Radio


OD
  5t  - Paravanes
50t - 2x Hydraulic catapults

HAW
1995t - Airgroup (21)

30t - 2x Additional Ventilation
30t - 2x Additional Fire Suppresion.

HBW
1995t - Airgroup (21)

15t - Additional Fire Suppression
15t - Additional pumps
50t - 45ts additional fuel 16,800gal in doublewall tanks (5t)

31t - Auxiliary DE 500kw Generator 180nm fuel

Decks :
 9.00   Flight Deck
 3.50   Battery Deck / Hanger floor
 1.00   Armored Deck
-1.50  2nd Deck, lower edge of fore/aft PD.
          -1.0 Bottom Belt
-4.00  1st Plateform Deck
-5.00  Engineering
-6.31  Double Bottom
-6.66  Keel

[Kaiser Kirk]

Parthian Minesweeper

I looked up a reference ship after finishing this. It started as a 1921 design I was updating.
I was wondering if I should do anything special for the wooden hull. I did not think so, as it likely is lighter than the steel hull.
So I looked up wooden minesweepers, and found  it's actually remarkably close to the USN's YMS-1.

Parthian has lots of minesweeping assets, and 44 active duty fleet minesweepers. However all have metal hulls, and magnetic mines are becoming more of a consideration.

A wooden hulled, and extensively coated in anti-fouling paint, coastal minesweeper.
Capable of oceanic passage, it is meant for shallow littoral waters.

It will join the old MSWE-11 class, and provide a new platform to address magnetic mine threats.
During wartime, it will be lead for local Gnat-class Minesweepers and any Patrol Sloops 1/2/3
committed to that mission.

Electric Drive : Electric Drive is used both to allow better damage survival, but more to allow maximum manuever as the Electric drive allows for full reverse speed on either or both propellers.

"Bulge" is a double hull and armored mine bottom. The sides are 0.5 wide and cover to the waterline. The 20mm deck represents the armored mine bottom, and  that the double hull wraps completely under the vessel.  The true bottom is at 2m, the double bottom ends at 2.5m.

Cruise speed is at ~1/3 power

Range is ~4400nm, 15 days at 12knots.

MSWE-55, Parthian 1939 Patrol Minesweeper laid down 1939

Displacement:
   236 t light; 253 t standard; 278 t normal; 298 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (117.34 ft / 114.83 ft) x 19.69 ft (Bulges 22.97 ft) x (8.20 / 8.70 ft)
   (35.77 m / 35.00 m) x 6.00 m (Bulges 7.00 m)  x (2.50 / 2.65 m)

Armament:
      1 - 3.54" / 90.0 mm 54.0 cal gun - 24.25lbs / 11.00kg shells, 250 per gun
     Dual purpose gun in deck mount, 1939 Model
     1 x Single mount on centreline, forward deck centre
      6 - 1.18" / 30.0 mm 70.0 cal guns - 0.92lbs / 0.42kg shells, 2,400 per gun
     Anti-air guns in deck mounts, 1939 Model
     2 x 2-gun mounts on sides, forward deck aft
     1 x 2-gun mount on sides amidships
      1 raised mount
      Weight of broadside 30 lbs / 14 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.31" / 8 mm         -               -
   2nd:   0.31" / 8 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 0.79" / 20 mm
   Forecastle: 0.79" / 20 mm  Quarter deck: 0.79" / 20 mm

Machinery:
   Diesel Internal combustion generators,
   Electric motors, 2 shafts, 1,000 shp / 746 Kw = 15.27 kts
   Range 2,500nm at 12.00 kts
   Bunker at max displacement = 46 tons

Complement:
   33 - 44

Cost:
   £0.082 million / $0.329 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 3.0 %
      - Guns: 8 tons, 3.0 %
   Armour: 50 tons, 18.1 %
      - Bulges: 27 tons, 9.9 %
      - Armament: 2 tons, 0.6 %
      - Armour Deck: 21 tons, 7.6 %
   Machinery: 27 tons, 9.7 %
   Hull, fittings & equipment: 67 tons, 24.0 %
   Fuel, ammunition & stores: 42 tons, 15.0 %
   Miscellaneous weights: 84 tons, 30.2 %
      - Hull below water: 30 tons
      - Bulge void weights: 4 tons
      - Hull above water: 21 tons
      - On freeboard deck: 27 tons
      - Above deck: 2 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     466 lbs / 211 Kg = 20.9 x 3.5 " / 90 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.31
   Metacentric height 0.7 ft / 0.2 m
   Roll period: 11.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.15
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.450 / 0.455
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 10.72 kts
   Power going to wave formation at top speed: 66 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 12.00 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 %,  11.81 ft / 3.60 m,  9.84 ft / 3.00 m
      - Forward deck:   30.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Aft deck:   35.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Quarter deck:   15.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      10.00 ft / 3.05 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 62.9 %
      - Above water (accommodation/working, high = better): 81.9 %
   Waterplane Area: 1,442 Square feet or 134 Square metres
   Displacement factor (Displacement / loading): 134 %
   Structure weight / hull surface area: 21 lbs/sq ft or 103 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.57
      - Longitudinal: 9.17
      - Overall: 0.75
   Caution: Hull subject to strain in open-sea
   Excellent machinery, storage, compartmentation space
   Cramped 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



Miscellaneous Weight :
4t : Construction Reserve

AD
1t : FC
1t : Night Gear
0t : SR Radio

OD
2t : 2 x 'K' Throwers

25t : Anti-mine gear 1939
10t : 30 Depthcharges


HAW
1t : CO2 Compressor AC cooling

10t : Extra accomodations and provision
10t : Temporary Accomodation 20-40men.

HBW
15t : Turbogenerator
15t : Enhanced hydrophones