Patrol Auxiliaries

[Kaiser Kirk]

Class Name : Sentry PS-1
Parthian Senty Class Patrol Sloop laid down 1916
Refitted 1919, all vessels have enhanced Hydrophones
Refitted fleet refits 1922 for FC.

Laid down 1916-1923.5 at 4 per HY

PS -1 to PS - 60

1916.5   PS-1  1-4    Patrol Sloop Series 1
1917.0   PS-1 5-8    Patrol Sloop Series 1
1917.5   PS-1 9-12    Patrol Sloop Series 1
1918.0   PS-1 13-16    Patrol Sloop Series 1
1918.5   PS-1 17-20    Patrol Sloop Series 1
1919.0   PS-1 20-24    Patrol Sloop Series 1
1919.5   PS-1 25-28    Patrol Sloop Series 1
1920.0   PS-1 29-32    Patrol Sloop Series 1
1920.5   PS-1 33-36    Patrol Sloop Series 1
1921.0   PS-1 37-40    Patrol Sloop Series 1
1921.5   PS-1 41-44    Patrol Sloop Series 1
1922.0   PS-1 45-48    Patrol Sloop Series 1
1922.5   PS-1 49-52    Patrol Sloop Series 1
1923.0   PS-1 53-56    Patrol Sloop Series 1
1923.5   PS-1 57-60    Patrol Sloop Series 1

Displacement:
   600 t light; 616 t standard; 660 t normal; 696 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (239.52 ft / 236.22 ft) x 29.53 ft x (6.56 / 6.83 ft)
   (73.00 m / 72.00 m) x 9.00 m  x (2.00 / 2.08 m)

Armament:
      1 - 3.54" / 90.0 mm 45.0 cal gun - 22.05lbs / 10.00kg shells, 200 per gun
     Quick firing gun in deck mount, 1899 Model
     1 x Single mount on centreline forward
      3 - 1.77" / 45.0 mm 45.0 cal guns - 2.80lbs / 1.27kg shells, 100 per gun
     Quick firing guns in deck mounts, 1899 Model
     1 x Single mount on centreline, aft deck centre
     2 x Single mounts on sides, forward deck aft
      Weight of broadside 30 lbs / 14 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.12" / 3 mm         -               -
   2nd:   0.12" / 3 mm         -               -

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Electric motors, 2 shafts, 2,373 ihp / 1,770 Kw = 18.00 kts
   Range 2,600nm at 10.00 kts
   Bunker at max displacement = 79 tons (23% coal)

Complement:
   64 - 84

Cost:
   £0.085 million / $0.341 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 0.9 %
      - Guns: 6 tons, 0.9 %
   Armour: 1 tons, 0.2 %
      - Armament: 1 tons, 0.2 %
   Machinery: 143 tons, 21.7 %
   Hull, fittings & equipment: 255 tons, 38.7 %
   Fuel, ammunition & stores: 60 tons, 9.1 %
   Miscellaneous weights: 195 tons, 29.5 %
      - Hull below water: 60 tons
      - Hull void weights: 4 tons
      - Hull above water: 48 tons
      - On freeboard deck: 32 tons
      - Above deck: 51 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,238 lbs / 561 Kg = 55.6 x 3.5 " / 90 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.28
   Metacentric height 1.2 ft / 0.4 m
   Roll period: 11.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.04
   Seaboat quality  (Average = 1.00): 1.55

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.505 / 0.511
   Length to Beam Ratio: 8.00 : 1
   'Natural speed' for length: 15.37 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   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 %,  12.30 ft / 3.75 m,  10.66 ft / 3.25 m
      - Forward deck:   30.00 %,  10.66 ft / 3.25 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,  10.66 ft / 3.25 m
      - Average freeboard:      10.32 ft / 3.15 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 91.1 %
      - Above water (accommodation/working, high = better): 139.4 %
   Waterplane Area: 4,669 Square feet or 434 Square metres
   Displacement factor (Displacement / loading): 133 %
   Structure weight / hull surface area: 36 lbs/sq ft or 178 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.81
      - 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

A adjunct to the  CPC-1 Mackeral class of coastal patrol cutters,
combining some of it's roles with those of the 40-strong MSE-13 class of minesweepers.

Range is sufficient to transit between territories,
while coal burning provision allows for local coal/wood to be used if bunker oil runs short.

A turbo-electric plant is fitted, along with batteries. This is hoped to allow the ship to manuever quietly. Turbo-electric has been used for the MSW class for years, the ability to use full reverse/forward on either screw assisting in manueverability, thought useful in minefields.

A kite balloon, echoing the Japanese, is fitted for reconnaissance purposes, and for sub-spotting.

Miscellaneous Weights :
AD :
25t LR radio
0.5t FC 1918
25t Kite Balloon

OD :
1t : ASW Kites
6t : 30x 195kg DC.
25t Minesweeping gear

HAW:
45t Miscellaneous Cargo
3t  CO2 compessor AC

Hull below water:
15t "Enhanced Hydrophone Package".
35t  Turbo-electric generators
10t  Batteries

Designed primarily as an affordable subchaser/minesweeper/sentry ship.

Range is sufficient to transit between territories,
while coal burning provision allows for local coal/wood to be used if bunker oil runs short.

A kite balloon, echoing the Japanese, is fitted for reconnaissance purposes, and for sub-spotting.

Minesweeping gear, such as paravanes, booms, trawls, is stored.

The main gun is a 90mm QF, the common light naval gun. The HV rounds will not penetrate water worth a darn, but will provide ranging information on misses. One hit with a SAP is expected to penetrate a submarine hull easily.

45mm QF are also mounted to give 360 degree capability.

Simple rangefinders and plotting tables are fitted. The plotting tables will be used in both FC and plotting attack runs.

A 'full' hydrophone package is fitted.

As is typical in Parthian service, provision for coal/wood firing is made so that the vessel can operate from commercial coal stocks.

A turbo-electric plant is fitted, along with batteries. This is hoped to allow the ship to manuever quietly. Turbo-electric has been used for the MSW class for years, the ability to use full reverse/forward on either screw assisting in manueverability, thought useful in minefields.

The ship has a small hold, as it is anticipated it may be used to ferry cargos along territorial coasts, where it's high manueverability and shallow draft may proove useful.

Mercantile
600t x 0.02 = 12

-4.4 guns
-.5  Firecontrol
=7 tons for ASW weapons.

1t ASW Kite
6t 30x 195kg DCs
= 7 tons ASW weapons

[Kaiser Kirk]

Class Name : Sentinel
Sentinel PS-2, Parthian Sentinel Class Patrol Sloop laid down 1924

Built 1924 to 1929 at 4 per HY.

1924.0   PS-2 61-64    Patrol Sloop Series 2
1924.5   PS-2 65-68    Patrol Sloop Series 2
1925.0   PS-2 69-72    Patrol Sloop Series 2
1925.5   PS-2 73-76    Patrol Sloop Series 2
1926.0   PS-2 77-80    Patrol Sloop Series 2
1926.5   PS-2 81-84    Patrol Sloop Series 2
1927.0   PS-2 85-88    Patrol Sloop Series 2
1927.5   PS-2 89-92    Patrol Sloop Series 2
1928.0   PS-2 93-96    Patrol Sloop Series 2
1928.5   PS-2 97-100    Patrol Sloop Series 2


Production continues

PS 97 - 100 planned for completion  HY1 1929

Displacement:
   588 t light; 605 t standard; 650 t normal; 686 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (236.24 ft / 232.94 ft) x 29.53 ft x (6.56 / 6.84 ft)
   (72.00 m / 71.00 m) x 9.00 m  x (2.00 / 2.08 m)

Armament:
      1 - 3.54" / 90.0 mm 45.0 cal gun - 24.25lbs / 11.00kg shells, 200 per gun
     Quick firing gun in deck mount, 1924 Model
     1 x Single mount on centreline, forward deck forward
      1 - 2.24" / 57.0 mm 60.0 cal gun - 6.61lbs / 3.00kg shells, 300 per gun
     Quick firing gun in deck mount, 1924 Model
     1 x Single mount on centreline, forward deck centre
      1 raised mount
      Weight of broadside 31 lbs / 14 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.12" / 3 mm         -               -
   2nd:   0.12" / 3 mm         -               -

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Electric motors, 2 shafts, 1,892 ihp / 1,412 Kw = 17.00 kts
   Range 2,900nm at 10.00 kts
   Bunker at max displacement = 81 tons (23% coal)

Complement:
   63 - 83

Cost:
   £0.117 million / $0.467 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 0.9 %
      - Guns: 6 tons, 0.9 %
   Armour: 1 tons, 0.1 %
      - Armament: 1 tons, 0.1 %
   Machinery: 112 tons, 17.2 %
   Hull, fittings & equipment: 251 tons, 38.6 %
   Fuel, ammunition & stores: 62 tons, 9.5 %
   Miscellaneous weights: 219 tons, 33.7 %
      - Hull below water: 64 tons
      - Hull void weights: 8 tons
      - Hull above water: 66 tons
      - On freeboard deck: 30 tons
      - Above deck: 51 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,379 lbs / 625 Kg = 62.0 x 3.5 " / 90 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.29
   Metacentric height 1.3 ft / 0.4 m
   Roll period: 11.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.05
   Seaboat quality  (Average = 1.00): 1.73

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.504 / 0.511
   Length to Beam Ratio: 7.89 : 1
   'Natural speed' for length: 15.26 kts
   Power going to wave formation at top speed: 47 %
   Trim (Max stability = 0, Max steadiness = 100): 41
   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 %,  12.30 ft / 3.75 m,  10.66 ft / 3.25 m
      - Forward deck:   30.00 %,  10.66 ft / 3.25 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,  10.66 ft / 3.25 m
      - Average freeboard:      10.32 ft / 3.15 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 80.9 %
      - Above water (accommodation/working, high = better): 139.5 %
   Waterplane Area: 4,599 Square feet or 427 Square metres
   Displacement factor (Displacement / loading): 142 %
   Structure weight / hull surface area: 36 lbs/sq ft or 177 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.85
      - 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

Patrol Sloop Series-2

As is typical in Parthian service, provision for coal/wood firing is made so that the vessel can operate from commercial coal stocks.


Miscellaneous Weights :
AD :
25t LR radio
1t :  FC 1918
5t : Night Fighting
20t : Squadron Plot Room

OD :
1t : ASW Paravanes
4t : 12x 280kg DC.
25t Minesweeping gear

HAW:
65t Miscellaneous Cargo
1t  CO2 compessor AC

Hull below water:
1t   10x 100kg "stick bombs" for 90mm gun
10t Basic Sonar
15t "Enhanced Hydrophone Package".
28t  Turbo-electric generators
10t  Batteries

A follow up to the PS-1 Patrol Sloop

Designed primarily as an affordable subchaser/minesweeper/sentry ship.

Range is sufficient to transit between territories,
while coal burning provision allows for local coal/wood to be used if bunker oil runs short.

Minesweeping gear, such as paravanes, booms, trawls, is stored
on the aft deck.

The main gun is a 90mm QF, the common light naval gun. The HV rounds will not penetrate water worth a darn, but will provide ranging information on misses. One hit with a SAP is expected to penetrate a submarine hull easily.

Stick bombs are now provided to give some waterpenetration ability.

A pair of 57mm AA are superimposed fore & aft.

Simple rangefinders and plotting tables are fitted. The plotting tables will be used in both FC and plotting attack runs.

A 'full' hydrophone package is fitted.
The -2 version also features Sonar.

As is typical in Parthian service, provision for coal/wood firing is made so that the vessel can operate from commercial coal stocks.

A turbo-electric plant is fitted, along with batteries. This is hoped to allow the ship to maneuver quietly. Turbo-electric has been used for the MSW class for years, the ability to use full reverse/forward on either screw assisting in maneuverability, thought useful in minefields.

The ship has a small hold, as it is anticipated it may be used to ferry cargos along territorial coasts, where it's high maneuverability and shallow draft may prove useful.

Mercantile
Armanent : 2% of Normal
650t x 0.02 = 13.0

-6t    guns (note, 3mm "armor" is not armor, just spray shields)
=7  tons for ASW weapons.

1t ASW Paravane
1t "Y" Thrower
1t 10x 100kg Stick bombs for main 90mm gun
4t 12x 195kg DCs

= 7 tons ASW weapons

[Kaiser Kirk]

Class name : Gnat Coastal Patrol Boat
Subtype : "A"   Gunboat

1922.5   CPB-A   5
1923.0   CPB-A   5
1923.5   CPB-A   5
1923.5   CPB-A   3
1923.5   CPB-A   3
1925.0   CPB-A   3
1925.5   CPB-A   3
1926.0   CPB-A   3
1926.5   CPB-A   3
1927.0   CPB-A   3
1927.5   CPB-A   3
1928.0   CPB-A   2
1928.5   CPB-A   2

still in production

Gnat Patrol Aux, Parthian Small Coastal Auxiliary laid down 1922

Displacement:
   280 t light; 289 t standard; 300 t normal; 310 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (163.72 ft / 160.76 ft) x 22.97 ft x (5.45 / 5.58 ft)
   (49.90 m / 49.00 m) x 7.00 m  x (1.66 / 1.70 m)

Armament:
      1 - 3.54" / 90.0 mm 45.0 cal gun - 22.05lbs / 10.00kg shells, 200 per gun
     Quick firing gun in deck mount, 1904 Model
     1 x Single mount on centreline, forward deck centre
      6 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 1,500 per gun
     Machine guns in deck mounts, 1917 Model
     1 x Twin mount on centreline, aft deck centre
      1 raised mount
     2 x Twin mounts on sides amidships
      2 raised mounts
      Weight of broadside 23 lbs / 10 kg

Machinery:
   Coal and oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 2,202 shp / 1,642 Kw = 19.00 kts
   Range 2,420nm at 8.00 kts
   Bunker at max displacement = 21 tons (23% coal)

Complement:
   35 - 46

Cost:
   £0.059 million / $0.238 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 1.5 %
      - Guns: 5 tons, 1.5 %
   Machinery: 76 tons, 25.4 %
   Hull, fittings & equipment: 128 tons, 42.6 %
   Fuel, ammunition & stores: 21 tons, 6.9 %
   Miscellaneous weights: 71 tons, 23.6 %
      - Hull below water: 37 tons
      - Hull void weights: 1 tons
      - Hull above water: 17 tons
      - On freeboard deck: 15 tons
      - Above deck: 1 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     474 lbs / 215 Kg = 21.3 x 3.5 " / 90 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.21
   Metacentric height 0.8 ft / 0.2 m
   Roll period: 10.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.09
   Seaboat quality  (Average = 1.00): 1.27

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.523 / 0.527
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 12.68 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 55
   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 %,  13.94 ft / 4.25 m,  11.48 ft / 3.50 m
      - Forward deck:   30.00 %,  11.48 ft / 3.50 m,  9.02 ft / 2.75 m
      - Aft deck:   35.00 %,  9.02 ft / 2.75 m,  9.02 ft / 2.75 m
      - Quarter deck:   15.00 %,  9.02 ft / 2.75 m,  9.02 ft / 2.75 m
      - Average freeboard:      10.08 ft / 3.07 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 106.9 %
      - Above water (accommodation/working, high = better): 131.1 %
   Waterplane Area: 2,513 Square feet or 233 Square metres
   Displacement factor (Displacement / loading): 127 %
   Structure weight / hull surface area: 29 lbs/sq ft or 140 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.83
      - Longitudinal: 5.00
      - 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

Coastal Patrol Gunboat "A" Variant

Void : 1t Reserve

AD :
1t 1918 FC

OD:
5t Advanced Paravanes
10t : Short Term berths 4 marines / long 2

HAW :
1t CO2 Compressor AC
1t Small Arms Locker
5t Brig
10t : Short term berths 4 marines / long 2

HBW
16 : Short term berths 6 marines / long 4
19t Turboelectric Generators
3t   Batteries.

The Gnat class has 3 variants - Patrol Gunboat, Patrol Subchaser, Patrol Minesweeper,
Each shares a common hull, engine, and below decks arrangement.
This allows for easier construction and maintenance, and staffing with reserve personnel.

The Gunboat and Minesweeper variants have 90mm guns
The Subchaser variant has only a 57mm, albeit high-velocity and flat firing, allowing fast accurate shots to hole a submarine sail.

All three are intended to operate in Parthian Littoral waters, in 'Coast Guarding' roles,
allowing tax collection, fisheries regulation, pirate suppression, etc.
They have minimal combat ability, but can participate against asymetric attacks,
such as 'commando' raids, 'tip and run' light combatant dashes, offensive mining, and submarines.
As their draft is less than most torpedo's depth setting, they are expected to be problematic for subs.

In the face of any heavy combatants, they are expected to go hide in littoral waters, or up a river, behind an island..
where the draft of the heavier vessel will prevent them from following.  Each vessel has preplanned 'hidey holes' in their patrol zones.

[Kaiser Kirk]

Class : Gnat Coastal Patrol Boat
Subtype : "B" - Subchaser

1922.5   CPB-C   3
1923.0   CPB-C   3
1923.5   CPB-C   3
1923.5   CPB-C   3
1923.5   CPB-C   3
1925.0   CPB-C   3
1925.5   CPB-C   3
1926.0   CPB-C   3
1926.5   CPB-C   3
1927.0   CPB-C   3
1927.5   CPB-C   3
1928.0   CPB-C   4
1928.5   CPB-C   4

still in production

Gnat Patrol Aux, Parthian Small Coastal Auxiliary laid down 1922

Displacement:
   280 t light; 289 t standard; 300 t normal; 310 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (163.72 ft / 160.76 ft) x 22.97 ft x (5.45 / 5.58 ft)
   (49.90 m / 49.00 m) x 7.00 m  x (1.66 / 1.70 m)

Armament:
      1 - 2.24" / 57.0 mm 60.0 cal gun - 6.61lbs / 3.00kg shells, 400 per gun
     Quick firing gun in deck mount, 1917 Model
     1 x Single mount on centreline, forward deck centre
      6 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 2,500 per gun
     Machine guns in deck mounts, 1917 Model
     1 x Twin mount on centreline, aft deck centre
      1 raised mount
     2 x Twin mounts on sides amidships
      2 raised mounts
      Weight of broadside 7 lbs / 3 kg

Machinery:
   Coal and oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 2,202 shp / 1,642 Kw = 19.00 kts
   Range 2,420nm at 8.00 kts
   Bunker at max displacement = 21 tons (23% coal)

Complement:
   35 - 46

Cost:
   £0.058 million / $0.231 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.7 %
      - Guns: 2 tons, 0.7 %
   Machinery: 76 tons, 25.4 %
   Hull, fittings & equipment: 127 tons, 42.2 %
   Fuel, ammunition & stores: 20 tons, 6.7 %
   Miscellaneous weights: 75 tons, 25.0 %
      - Hull below water: 37 tons
      - Hull void weights: 2 tons
      - Hull above water: 17 tons
      - On freeboard deck: 18 tons
      - Above deck: 1 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     493 lbs / 224 Kg = 87.3 x 2.2 " / 57 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.21
   Metacentric height 0.8 ft / 0.2 m
   Roll period: 10.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.03
   Seaboat quality  (Average = 1.00): 1.28

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.523 / 0.527
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 12.68 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 55
   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 %,  13.94 ft / 4.25 m,  11.48 ft / 3.50 m
      - Forward deck:   30.00 %,  11.48 ft / 3.50 m,  9.02 ft / 2.75 m
      - Aft deck:   35.00 %,  9.02 ft / 2.75 m,  9.02 ft / 2.75 m
      - Quarter deck:   15.00 %,  9.02 ft / 2.75 m,  9.02 ft / 2.75 m
      - Average freeboard:      10.08 ft / 3.07 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 104.9 %
      - Above water (accommodation/working, high = better): 131.1 %
   Waterplane Area: 2,513 Square feet or 233 Square metres
   Displacement factor (Displacement / loading): 128 %
   Structure weight / hull surface area: 28 lbs/sq ft or 138 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.84
      - Longitudinal: 4.91
      - 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

I have realized that the Variant 2 of the Gnat class will
need different armanent for it's role, in order to stay in
the Aux class.

So instead of the 1x 90mm,
it will mount 1x 57L60 in the new AS mount.
The brits mounted 6pdrs, so it's not 'too small', just not as good.

Very high velocity, flat shots, it is expected to penetrate
the pressure hull at relatively close ranges.


1. Coastal/Riverine water Patrol
2. Subchaser
3. Minesweeper

Normal Disp : 300t x 0.02 = 6t arms
Configuration 1 & 3 : 1x90L45, 6x 15L70 :  4.46 tons
All ok

Version 2 : Guns : 2.46tons = ok, 3.54 tons 'slack'.

Subchaser configuration

Void : 2t Reserve

AD :
1t FC 1918

OD :
5t : Advanced Paravanes
3t : DC 195kg x 15
10t : Short term berths 4 marines

HAW :
1t CO2 Compressor AC
1t Small Arms locker
5t Brig
10t : Short term berths 4 marines

HBW
15t : Enhanced Hydrophones
19t : Turboelectrice Generators
3t : Batteries

Aux Cost : 70t

[Kaiser Kirk]

Class Name : Gnat Coastal Patrol Boat
Subtype : "C" Minesweeper


1922.5   CPB-B   3
1923.0   CPB-B   3
1923.5   CPB-B   3
1923.5   CPB-B   3
1923.5   CPB-B   3
1925.0   CPB-B   3
1925.5   CPB-B   3
1926.0   CPB-B   3
1926.5   CPB-B   3
1927.0   CPB-B   3
1927.5   CPB-B   3
1928.0   CPB-B   4
1928.5   CPB-B   4

production continues

Gnat Patrol Aux, Parthian Small Coastal Auxiliary laid down 1922

Displacement:
   280 t light; 289 t standard; 300 t normal; 310 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (163.72 ft / 160.76 ft) x 22.97 ft x (5.45 / 5.58 ft)
   (49.90 m / 49.00 m) x 7.00 m  x (1.66 / 1.70 m)

Armament:
      1 - 3.54" / 90.0 mm 45.0 cal gun - 22.05lbs / 10.00kg shells, 200 per gun
     Quick firing gun in deck mount, 1904 Model
     1 x Single mount on centreline, forward deck centre
      6 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 1,500 per gun
     Machine guns in deck mounts, 1917 Model
     1 x Twin mount on centreline, aft deck centre
      1 raised mount
     2 x Twin mounts on sides amidships
      2 raised mounts
      Weight of broadside 23 lbs / 10 kg

Machinery:
   Coal and oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 2,202 shp / 1,642 Kw = 19.00 kts
   Range 2,420nm at 8.00 kts
   Bunker at max displacement = 21 tons (23% coal)

Complement:
   35 - 46

Cost:
   £0.059 million / $0.238 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 1.5 %
      - Guns: 5 tons, 1.5 %
   Machinery: 76 tons, 25.4 %
   Hull, fittings & equipment: 128 tons, 42.6 %
   Fuel, ammunition & stores: 21 tons, 6.9 %
   Miscellaneous weights: 71 tons, 23.6 %
      - Hull below water: 37 tons
      - Hull void weights: 1 tons
      - Hull above water: 17 tons
      - On freeboard deck: 15 tons
      - Above deck: 1 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     474 lbs / 215 Kg = 21.3 x 3.5 " / 90 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.21
   Metacentric height 0.8 ft / 0.2 m
   Roll period: 10.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.09
   Seaboat quality  (Average = 1.00): 1.27

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.523 / 0.527
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 12.68 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 55
   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 %,  13.94 ft / 4.25 m,  11.48 ft / 3.50 m
      - Forward deck:   30.00 %,  11.48 ft / 3.50 m,  9.02 ft / 2.75 m
      - Aft deck:   35.00 %,  9.02 ft / 2.75 m,  9.02 ft / 2.75 m
      - Quarter deck:   15.00 %,  9.02 ft / 2.75 m,  9.02 ft / 2.75 m
      - Average freeboard:      10.08 ft / 3.07 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 106.9 %
      - Above water (accommodation/working, high = better): 131.1 %
   Waterplane Area: 2,513 Square feet or 233 Square metres
   Displacement factor (Displacement / loading): 127 %
   Structure weight / hull surface area: 29 lbs/sq ft or 140 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.83
      - Longitudinal: 5.00
      - 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

Minesweeper Configuration
Void : 1 tons reserve

AD :
1t FC 1918

OD :
5t Paravanes
25t Minesweeping Trawls

HAW
1t  CO2 compressor AC
1t  Small Arms locker
5t  Brig
10t Cargo

HBW
19t : Turboelectric generator
3t : Batteries

2% Normal : 6.0, vs guns 5t
Aux Cost : 70t

[Kaiser Kirk]

Hydraulic Empires harnessed water on floodplains to grow sufficient food to feed the people.
They also had centralized governments that planned future planting, while keeping stores for Famine relief
and coordinated Flood response.

A core competency of the Parthian Central Government is long range planning for the future prosperity of all.
That includes Guarding the Empire, Policing the Empire, providing for roads, basic housing, food and education, and disaster relief.
National Service is rooted in this, and from the national Service levees are the labor used in disaster response.
Local military will of course be brought in as well.

Railways and roads knitting Parthia together has allowed this response to become swift.
The addition of vast territories across Oceans has led to the response being quite slow.

Earthquakes in Parthia are common.
Floods in the Tigris/Euphrates are mostly corralled by dams in the headwaters, and levees set far from the banks, allowing the rivers to flood the alluvial plains. Towns in that region are frequently on 'tels' of raised earth with their own levee and pumps.

Ceylon has challenges with flooding in monsoons.
Sumatra as well, though volcanoes add earthquakes, while fine particular ejecta can lead to torrential rains triggering mudflows.
Much of the Oceanic area is subject to storm damage.
California had a massive quake shortly before Parthia landed, and flooding of the central valley was a persistent problem. Massive storms lash the Pacific Northwest on a regular basis.  The mighty African rivers are not confined to their banks, and much of the East coast is subject to the occasional Storm. Hurricanes regularly track across the Caribbean, and flooding can affect riverine areas of West Africa and South America.

MOST..not all, are accessible from the sea.

Rather than the slow process of requisitioning transports, moving the National Service folks there, loading them , and then plodding to the disaster area, the Parthians have chosen a more visible method of building ships that can be stationed across the Empire, and steam at high speed to the area of need, delivering basic engineering ability as well as stores to help those in need for a couple weeks until more help arrives.
These ships are

Ardi / Sura / Anahita, Parthian Territorial Assistance Vessel laid down 1929

Displacement:
   14,500 t light; 14,831 t standard; 16,537 t normal; 17,902 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (462.34 ft / 456.36 ft) x 91.21 ft x (20.01 / 21.45 ft)
   (140.92 m / 139.10 m) x 27.80 m  x (6.10 / 6.54 m)

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

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      0.98" / 25 mm   296.65 ft / 90.42 m   19.42 ft / 5.92 m
   Beam between torpedo bulkheads 68.24 ft / 20.80 m

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

Machinery:
   Diesel Internal combustion generators,
   Electric motors, 3 shafts, 19,828 shp / 14,792 Kw = 19.10 kts
   Range 7,450nm at 16.00 kts
   Bunker at max displacement = 3,071 tons

Complement:
   728 - 947

Cost:
   £2.371 million / $9.484 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Armour: 210 tons, 1.3 %
      - Torpedo bulkhead: 210 tons, 1.3 %
   Machinery: 609 tons, 3.7 %
   Hull, fittings & equipment: 3,936 tons, 23.8 %
   Fuel, ammunition & stores: 2,037 tons, 12.3 %
   Miscellaneous weights: 9,745 tons, 58.9 %
      - Hull below water: 4,907 tons
      - Hull void weights: 100 tons
      - Hull above water: 3,340 tons
      - On freeboard deck: 1,340 tons
      - Above deck: 58 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     32,194 lbs / 14,603 Kg = 298.1 x 6 " / 152 mm shells or 5.3 torpedoes
   Stability (Unstable if below 1.00): 1.83
   Metacentric height 11.6 ft / 3.5 m
   Roll period: 11.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 75 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.75

Hull form characteristics:
   Hull has raised forecastle, raised quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.695 / 0.702
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 21.36 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 43
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: -3.28 ft / -1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   17.50 %,  22.31 ft / 6.80 m,  22.31 ft / 6.80 m
      - Forward deck:   30.00 %,  18.21 ft / 5.55 m,  14.11 ft / 4.30 m
      - Aft deck:   35.00 %,  14.11 ft / 4.30 m,  18.21 ft / 5.55 m
      - Quarter deck:   17.50 %,  22.31 ft / 6.80 m,  22.31 ft / 6.80 m
      - Average freeboard:      18.31 ft / 5.58 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 89.5 %
      - Above water (accommodation/working, high = better): 140.4 %
   Waterplane Area: 33,208 Square feet or 3,085 Square metres
   Displacement factor (Displacement / loading): 148 %
   Structure weight / hull surface area: 93 lbs/sq ft or 456 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.43
      - 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, rides out heavy weather easily

Named for Zorastorian Arch Angels
Ardi Sura Anahita - Fertility, health, water, wisdom


Intended to be a vessel to support engineering and disaster relief efforts in the territories, based off the hull of the Hakma fleet support ship.
14,400 - 23.5 months, $0.9/HY

For these, they willl be a Hakma hull, but
fitted with Diesel-Electric engines, and the final fitting out of the non-structural elements and superstructure will be different.

Unlike the Hakma these ships are completely unarmed,relying on the kindness of strangers.  They retain the torpedo bulkhead of the basic hull.

The provisions to host seaplanes is retained,

Total Weaponry : 16,537 normal *.02 = 330.7t
Torpedo Bulkhead : 210t
20t total.

Total Range i+50%

3071t

@ 18knots = 5390 * 1.5    =   8,085nm
@ 16knots = 7450 * 1.5    = 11,175nm
@ 12knots = 15,420 * 1.5 = 23,130nm

Void : 200 tons resv

AD
25t LR Radio
10t SR Radio - dedicated RCN channels.
23t Cage Mast amidships

OD
40+10t : 2x Scout Floatplanes + Gunpowder Cats.
20t Hanger structure
12t : Additional Cranes
300t : Cabins for passengers
600t : Surgical ward
240t : Officer Accomodation (6t/each)
200t : 4x 50t motor launches.

HAW
3200t- Accomodation for up to 800 pioneers/medical (4t each)
15t  CO2 Compressor AC
25t  Extra Fire Suppresion
100t Earth moving equipment

HBW
4500t - stores (various)
16t additional avgas
25t Extra Pumps
153t - Turboelectic Generators
183t - Diesel weight
30t - Auxilary Diesel Generator - 513 KW, 7.1 knots

[Kaiser Kirk]

Deniz Saraydar "Sea Custodian", Parthia Harbormaster Net Tender

6 built
FNT - 1  Deniz Saraydar,  laid down 1922.0
..
FNT - 6  Laid down 1928.5

Displacement:
   6,599 t light; 6,838 t standard; 7,558 t normal; 8,134 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (334.45 ft / 328.08 ft) x 72.18 ft x (16.40 / 17.48 ft)
   (101.94 m / 100.00 m) x 22.00 m  x (5.00 / 5.33 m)

Armament:
      8 - 5.12" / 130 mm 50.0 cal guns - 70.55lbs / 32.00kg shells, 200 per gun
     Quick firing guns in casemate mounts, 1922 Model
     8 x Single mounts on sides, evenly spread
      8 hull mounts in casemates- Limited use in any sea
      6 - 3.54" / 90.0 mm 50.0 cal guns - 24.25lbs / 11.00kg shells, 200 per gun
     Anti-air guns in deck mounts, 1922 Model
     2 x Single mounts on centreline ends, evenly spread
     4 x Single mounts on side ends, evenly spread
      8 - 2.24" / 57.0 mm 45.0 cal guns - 6.61lbs / 3.00kg shells, 300 per gun
     Breech loading guns in deck mounts, 1922 Model
     2 x Twin mounts on sides amidships
      2 raised mounts
     2 x Twin mounts on centreline ends, evenly spread
      2 raised mounts
      Weight of broadside 763 lbs / 346 kg

Machinery:
   Coal and oil fired boilers, steam turbines,
   Electric motors, 3 shafts, 6,865 shp / 5,121 Kw = 16.00 kts
   Range 8,800nm at 12.00 kts
   Bunker at max displacement = 1,296 tons (23% coal)

Complement:
   404 - 526

Cost:
   £0.830 million / $3.321 million

Distribution of weights at normal displacement:
   Armament: 146 tons, 1.9 %
      - Guns: 146 tons, 1.9 %
   Machinery: 238 tons, 3.1 %
   Hull, fittings & equipment: 1,627 tons, 21.5 %
   Fuel, ammunition & stores: 959 tons, 12.7 %
   Miscellaneous weights: 4,589 tons, 60.7 %
      - Hull below water: 3,475 tons
      - Hull void weights: 60 tons
      - Hull above water: 380 tons
      - On freeboard deck: 580 tons
      - Above deck: 94 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     15,025 lbs / 6,815 Kg = 224.1 x 5.1 " / 130 mm shells or 2.4 torpedoes
   Stability (Unstable if below 1.00): 2.46
   Metacentric height 12.0 ft / 3.7 m
   Roll period: 8.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 1.63

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.681 / 0.688
   Length to Beam Ratio: 4.55 : 1
   'Natural speed' for length: 18.11 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 31
   Bow angle (Positive = bow angles forward): 10.00 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 %,  17.49 ft / 5.33 m,  14.30 ft / 4.36 m
      - Forward deck:   25.00 %,  14.30 ft / 4.36 m,  11.12 ft / 3.39 m
      - Aft deck:   35.00 %,  11.12 ft / 3.39 m,  11.12 ft / 3.39 m
      - Quarter deck:   20.00 %,  11.12 ft / 3.39 m,  11.12 ft / 3.39 m
      - Average freeboard:      12.41 ft / 3.78 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 72.0 %
      - Above water (accommodation/working, high = better): 103.7 %
   Waterplane Area: 18,660 Square feet or 1,734 Square metres
   Displacement factor (Displacement / loading): 139 %
   Structure weight / hull surface area: 74 lbs/sq ft or 362 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.50
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather



Armanent is casement mounted 130mm for surface raiders, expected to be fast and high speed, and a heavy suite of AA to fend off enemy air.


"Armanent": 2% of Normal = 7558 * 0.02 = 151.16
Guns : 146
ok !



Miscellaneous Wieght :
60t reserve

AD:
11t Fire Control 1918
25t LR Fire Control
10t SR Radio - Dedicated Flight Command
25t Hulesmeyer
23t Cage Mast for Air Traffic Control

OD:
120 : 6x  20  Scout  Float Plane
10t : 2x waist gun powder cats .
25 : Harbor Command Plotting room....
400 : 2x100t "Nettender" tug
25t : Additional Firefighting gear

HAW
25t Compressor CO2 AC
25t Minesweeping gear
15t  CO2 Compressor AC
25t  Additional Fire Suppression
200t : Additional Berthing
100t : Hospital Ward

HBW
3360t - Bueliviant Torpedo netting + ASW mines and floats. 3000m x 20m
60 :     Additional stores & avgas for floatplanes
25t :    Additional pumps
30t :  2x Enhanced Hydrophone stations

The Parthians have not built out the harbor defenses in territorial areas,
first focusing on basic maintenance infrastructure, so a wounded ship does not have to sail 8000nm to get repaired.

Further, they hope to use their fleet train to set up in non-developed
bays and anchorages for temporary bases.

A net-tending vessel - primarily to provide portable ASW/anti-torpedo netting for anchorages, but also equipped for a small floatplane group to provide local reconnaissance.

The stern ramps down, intended to allow floatplanes to advance onto a wire mesh mat and then be winched up the fantail.

The gunpowder catapults fire directly over the bow.
The vessel also carries only small group of on-board planes.
These are both an experiment, and to try to keep enemy reconnaisance at bay

Anchorage Torpedo nets are carried, these are double weight Bullivant nets, 50kg per square meters. Small 50kg electro-contact mines are studded into each 10x10m section, or +1kt/sq. meter. These are remotely armed and disarmed via electrical pulses.

Each 10m x 10m section is 5050kg = 11,110lbs = 4.96 naval tons.
To carry that the float must displace as much or more in seawater volume.
1 cu meter of seawater weighs 1,024 kg....so 5 cu meters would > the net
110m...which.....ah lets call the floats 0.6tons, so it's 10m for 5.6tons.

For this case, they want to be able to deploy them in panels either
20m deep.

So 3.0km is 300 x 20m sections or 3360t

Overall, this allows 2.0km of netting, which should mean the vessel can secure and anchorage and landing area.  If kept to the shallows the netting should extend to the bottom. Otherwise they can be placed close to ships so that there is no room for a sub to sneak under, rise and fire.

A pair of 100t launches are carried to serve as nettenders.
Deniz - Sea
Saraydar - Custodian

3 HY to build, aux so 1/4 price, so want tonnage in multiples of 12.
6.6 / 12 = 0.55/HY.

[Kaiser Kirk]

Anahita Class, Parthian Territorial Assistance Vessel

Named for Zorastorian Archangels of Fertility, health, water & wisdom

TAV - 1 Anahita, Laid 1929.0
TAV - 2 Sura, Laid 1930.0
TAV - 3 Ardi, Laid 1931.5

Displacement:
   14,500 t light; 14,831 t standard; 16,537 t normal; 17,902 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (462.34 ft / 456.36 ft) x 91.21 ft x (20.01 / 21.45 ft)
   (140.92 m / 139.10 m) x 27.80 m  x (6.10 / 6.54 m)

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

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      0.98" / 25 mm   296.65 ft / 90.42 m   19.42 ft / 5.92 m
   Beam between torpedo bulkheads 68.24 ft / 20.80 m

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

Machinery:
   Diesel Internal combustion generators,
   Electric motors, 3 shafts, 19,828 shp / 14,792 Kw = 19.10 kts
   Range 7,450nm at 16.00 kts
   Bunker at max displacement = 3,071 tons

Complement:
   728 - 947

Cost:
   £2.371 million / $9.484 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Armour: 210 tons, 1.3 %
      - Torpedo bulkhead: 210 tons, 1.3 %
   Machinery: 609 tons, 3.7 %
   Hull, fittings & equipment: 3,936 tons, 23.8 %
   Fuel, ammunition & stores: 2,037 tons, 12.3 %
   Miscellaneous weights: 9,745 tons, 58.9 %
      - Hull below water: 4,907 tons
      - Hull void weights: 100 tons
      - Hull above water: 3,340 tons
      - On freeboard deck: 1,340 tons
      - Above deck: 58 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     32,194 lbs / 14,603 Kg = 298.1 x 6 " / 152 mm shells or 5.3 torpedoes
   Stability (Unstable if below 1.00): 1.83
   Metacentric height 11.6 ft / 3.5 m
   Roll period: 11.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 75 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.75

Hull form characteristics:
   Hull has raised forecastle, raised quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.695 / 0.702
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 21.36 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 43
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: -3.28 ft / -1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   17.50 %,  22.31 ft / 6.80 m,  22.31 ft / 6.80 m
      - Forward deck:   30.00 %,  18.21 ft / 5.55 m,  14.11 ft / 4.30 m
      - Aft deck:   35.00 %,  14.11 ft / 4.30 m,  18.21 ft / 5.55 m
      - Quarter deck:   17.50 %,  22.31 ft / 6.80 m,  22.31 ft / 6.80 m
      - Average freeboard:      18.31 ft / 5.58 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 89.5 %
      - Above water (accommodation/working, high = better): 140.4 %
   Waterplane Area: 33,208 Square feet or 3,085 Square metres
   Displacement factor (Displacement / loading): 148 %
   Structure weight / hull surface area: 93 lbs/sq ft or 456 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.43
      - 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, rides out heavy weather easily

Named for Zorastorian Arch Angels
Ardi Sura Anahita - Fertility, health, water, wisdom


Intended to be a vessel to support engineering and disaster relief efforts in the territories, based off the hull of the Hakma fleet support ship.
14,400 - 23.5 months, $0.9/HY

For these, they willl be a Hakma hull, but
fitted with Diesel-Electric engines, and the final fitting out of the non-structural elements and superstructure will be different.

Unlike the Hakma these ships are completely unarmed,relying on the kindness of strangers.  They retain the torpedo bulkhead of the basic hull.

The provisions to host seaplanes is retained,

Total Weaponry : 16,537 normal *.02 = 330.7t
Torpedo Bulkhead : 210t
20t total.

Total Range i+50%

3071t

@ 18knots = 5390 * 1.5    =   8,085nm
@ 16knots = 7450 * 1.5    = 11,175nm
@ 12knots = 15,420 * 1.5 = 23,130nm

Void : 200 tons resv

AD
25t LR Radio
10t SR Radio - dedicated RCN channels.
23t Cage Mast amidships

OD
40+10t : 2x Scout Floatplanes + Gunpowder Cats.
20t Hanger structure
12t : Additional Cranes
300t : Cabins for passengers
600t : Surgical ward
240t : Officer Accomodation (6t/each)
200t : 4x 50t motor launches.

HAW
3200t- Accomodation for up to 800 pioneers/medical (4t each)
15t  CO2 Compressor AC
25t  Extra Fire Suppresion
100t Earth moving equipment

HBW
4500t - stores (various)
16t additional avgas
25t Extra Pumps
153t - Turboelectic Generators
183t - Diesel weight
30t - Auxilary Diesel Generator - 513 KW, 7.1 knots


A central concept to Parthia is the government does the big stuff well, but very traditional and slow to change. The limited democracy is mostly active at the local level, allowing people input on many of the rules that impact their daily lives.

Among the big things is planning for  wood & water supplies, infrastructure, education, security and disasters.

Crop failures, plagues, fire, flood, and the various earthquakes* historical Iran are something the central government is supposed to blunt the impact of.  I've meant to actually do a story showcasing how military engineer , quartermaster and medical units will respond and be assisted by National Service personnel.

Theoretically, the Parthians are trying to treat the territories as extensions of the Empire, not just founding immigrant cities and developing resources, but also providing infrastructure and basic government services broadly...including shipping Parthian youth to the territories to dig in the dirt to build them roads and canals.

The disaster response ability would probably be limited in those areas. Currently, the local troops and service folks could do something, but more would have to come from Parthia. 

Envisioned homeports are Brunei or Somoa and one probably in Freetown, and perhaps a 3rd at Tis.
That would put pretty much every coastal province no more than 5400nm away.

5400nm at 10knots is 22 days while at 16 it is 14 days.  While that is still a very long time, it's a week less.
If the area is closer, the vessel can push to higher speeds, and get there sooner.

The port may not be proximate, or destroyed, so the ship needs it's own motorized lighters. This would also help extend the response a river where the ship can't go.

A critical need is engineers - dozers to open roads, pioneers to build a timber bridge fast, cranes to offload ships if a port has been destroyed.
Restoring transport links is critical for helping others get here.

Doctors, and basic medical care to deal with patients who have survived the first couple weeks, but more importantly those now weakened by hunger or dealing with injuries.

Basic supplies - tents, spare clothes, food, water distillers, etc would be in the holds.

The floatplanes are for disaster, having aerial scouting to assess the situation - or even to land on a river/lake to drop off
people - could be useful.

[Kaiser Kirk]

Royn "Oil" Class, Parthian Fleet Oiler

AO - 1  Laid 1931.0
AO - 2  Laid 1931.5

Displacement:
   14,880 t light; 15,585 t standard; 16,861 t normal; 17,883 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (462.37 ft / 452.76 ft) x 90.55 ft x (21.33 / 22.44 ft)
   (140.93 m / 138.00 m) x 27.60 m  x (6.50 / 6.84 m)

Armament:
      4 - 4.72" / 120 mm 43.0 cal guns - 55.12lbs / 25.00kg shells, 300 per gun
     Dual purpose guns in deck mounts, 1929 Model
     2 x 2-gun mounts on centreline ends, evenly spread
      12 - 1.18" / 30.0 mm 80.0 cal guns - 55.12lbs / 25.00kg shells, 900 per gun
     Dual purpose guns in deck and hoist mounts, 1929 Model
     4 x 2-gun mounts on side ends, evenly spread
     2 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts
      Weight of broadside 882 lbs / 400 kg

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 20,259 shp / 15,113 Kw = 19.21 kts
   Range 5,595nm at 16.00 kts
   Bunker at max displacement = 2,298 tons

Complement:
   739 - 961

Cost:
   £2.697 million / $10.790 million

Distribution of weights at normal displacement:
   Armament: 47 tons, 0.3 %
      - Guns: 47 tons, 0.3 %
   Armour: 7 tons, 0.0 %
      - Armament: 7 tons, 0.0 %
   Machinery: 606 tons, 3.6 %
   Hull, fittings & equipment: 3,925 tons, 23.3 %
   Fuel, ammunition & stores: 1,981 tons, 11.8 %
   Miscellaneous weights: 10,295 tons, 61.1 %
      - Hull below water: 10,141 tons
      - Hull void weights: 44 tons
      - Hull above water: 40 tons
      - On freeboard deck: 40 tons
      - Above deck: 30 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     32,601 lbs / 14,788 Kg = 618.3 x 4.7 " / 120 mm shells or 3.0 torpedoes
   Stability (Unstable if below 1.00): 2.91
   Metacentric height 20.8 ft / 6.3 m
   Roll period: 8.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.02
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has raised forecastle, raised quarterdeck ,
     a ram bow and a round stern
   Block coefficient (normal/deep): 0.675 / 0.680
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 21.28 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 15.00 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,  23.62 ft / 7.20 m
      - Forward deck:   30.00 %,  15.42 ft / 4.70 m,  15.42 ft / 4.70 m
      - Aft deck:   30.00 %,  15.42 ft / 4.70 m,  15.42 ft / 4.70 m
      - Quarter deck:   20.00 %,  23.62 ft / 7.20 m,  23.62 ft / 7.20 m
      - Average freeboard:      18.70 ft / 5.70 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 80.8 %
      - Above water (accommodation/working, high = better): 127.7 %
   Waterplane Area: 32,130 Square feet or 2,985 Square metres
   Displacement factor (Displacement / loading): 145 %
   Structure weight / hull surface area: 95 lbs/sq ft or 465 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.56
      - 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

Royn "Oil" is a naval auxiliary tanker.

Designed to be able to fit in the merchant docks in the Pacific, max of 141m.
Designed with a shallow draf to fit almost any port, military or civilian.

This fleet oiler auxiliary is meant to be able to keep up with the battleline over strategic spaces.   Maximum speed is designed to let it cruise on 1/2power.
7553*2 = 15106hp needed

Range IS 5595 *1.15 = 6434

Tonnage is meant to complete within 2 years, and
tt 15,000 tons, it takes 24 months to completion.
But can be launched after 9.6 months, allowing docks to be prepped for the next vessel.

Maximum displacement would be 11 months in dock +1 to clear the dock, which would be
11/0.4 = 27.5 months
27.5-9 = 18.5 = 18,500 tons light disp.

While there are economies of scale with larger vessels,
that also makes their loss more difficult.

With 10,000 tons of bunker oil, any two battleships can fully refuel from one tanker.


Ams & Armor
Normal : 17036 * 0.02 = 340t arms & armor
Guns & Armor : 54
Torpedo nets : 141

Total : 195

Misc Wt :
44t - Reserves

AD
  5t - FC 1930
25t - LR Radio
  0t - SR Radio

OD
40t - 2x 20t Motor launches

HAW
25t - Add Fire Suppresion gear
15t - CO2 Compressor AC

HBW
141t - Torpedo Nets
10,000 - Fuel Oil for Replenishment