Parthian vessels 1916 onwards

Jefgte · October 29, 2022, 04:29:54 PM

Quote...Only one tiny problem :
...that build list takes like 86 BP / HY....which is
quite a lot more than I have...

Scrap the old hulls to get more BP.

;)

Kaiser Kirk · October 29, 2022, 07:53:34 PM

Quote from: Jefgte on October 29, 2022, 04:29:54 PM

Scrap the old hulls to get more BP.

;)

NOoooo !

My glorious old rusty historical vessels are a vital part of my plans !
...and given my sprawling territories, I rather need the numbers.

On a more realistic look, the 'Desired Builds' vs. what I can actually do
helps inform some decisions.

After the Kalifern class, I can either do the Irmulhu or the Stormbreaker, not both.
TwoStormbreaker would give me a 'fast wing' of 4x 26knts...which is still slower than alot of capital ships, so not sure that's worth it.
The additional 7,000 tons for an Irmulhu looks like a good choice then, as a Kalifern successor

Likewise, I've long wanted to do a 'Light Armored Cruiser' and I like the Dahae 'Heavy Armored Cruiser' designs, but I can't do both.
Combined they are 117.5 BP
Probably simply building more 2-4 Zemaka and rebuilding the Asbara class is more reasonable. That would give me 10-12 ships with 8x 10L47.

On aircraft carriers, I think I need to downscale that to the 'flight deck cruisers' and only 1-2 actual light carrier as a trials platform.
the late 1920s can be the carrier building spree.

On cruisers, the budget crunch highlights that while the 8000ton Royal Neissan are nice ships, but cost 1/3 more than the earlier classes.
I really need to get more hulls. So reverting to an 6000 ton, less capable hull, will help me keep numbers up.

The question will be if I continue the Artesmia class Frigates. The first 2 are just completed and are good maritime patrol, but poor as cruisers. Pressed into service with a fleet, they would be very good for intercepting destroyer/MTB attacks...but I have other ships for that too.
That's a lot of tonnage for ships that have limited use. Probably worth making a slower and more capable version is probably better.

Destroyers are a continuing problem.
I want lots of ASW / Anti-torpedo boat platforms.
The 1500ton ships are better for that,
but I can afford 4 "Vakhar" (wolf) for 3 Babr (Tiger).

Despite recent record of torpedo attacks, I still believe in MTBs,
but I intend not to use them on battlefleets.
MTBs are meant to be deployed in large squadrons and used in anti-commerce sweeps
or towards beachheads or independent squadrons.
Even if not deployed, the idea that there's 50-60 MTBs in striking range should
restrict enemy options.

Coastal Gunboats...there's not room in the budget to build
large numbers of ships that can't also be used as close escorts for the fleet.
So they will have to be fewer and at least 23 knots.
I should also take another look at a 'Dragonfly' river gunboat replacement,
but I kinda think the Gnat-series of patrol boats fulfills that storyline role.

Submarines..I'd actually like to build more than I have down,
the new Sub Tech should result in fairly capable boats, so I'm ready to
build them in numbers. I may just go with 500 tonners instead.

The Aux list I rather need.

Then overall, stretch the builds over more years.

Kaiser Kirk · November 01, 2022, 08:59:15 PM

Since I'm commenting on Rocky's thread, I figured I should show what I'm considering.
This is the slower of two designs.
Both are meant to replace the Artesmia I & II Frigates for long range maritime patrol and showing the flag.
with a secondary function of deep raiding/protection, and a tertiary of close escort.

While 12x 130 is fine for the close escort role, the Parthians feel the 165 is a good destroyer killer
while being more effective against the 4000-5000 ton cruisers out there. The Byzantine are tougher
but thats where night combat would be preferred.

Sayyida, Parthian Frigate laid down 1924

Displacement:
   3,000 t light; 3,175 t standard; 3,675 t normal; 4,075 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (426.19 ft / 419.95 ft) x 43.73 ft x (14.21 / 15.36 ft)
   (129.90 m / 128.00 m) x 13.33 m x (4.33 / 4.68 m)

Armament:
4 - 6.50" / 165 mm 43.0 cal guns - 143.30lbs / 65.00kg shells, 220 per gun
     Quick firing guns in deck and hoist mounts, 1924 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
8 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 800 per gun
     Anti-air guns in deck and hoist mounts, 1924 Model
     2 x 2-gun mounts on sides forward
     2 x 2-gun mounts on centreline ends, evenly spread
      2 double raised mounts
16 - 0.59" / 15.0 mm 70.0 cal guns - 0.12lbs / 0.05kg shells, 5,000 per gun
     Machine guns in deck and hoist mounts, 1924 Model
     4 x 2 row quad mounts on side ends, evenly spread
      4 raised mounts
16 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 3,000 per gun
     Breech loading guns in deck mounts, 1924 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
Weight of broadside 630 lbs / 286 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.57" / 40 mm   293.96 ft / 89.60 m   12.01 ft / 3.66 m
   Ends:   Unarmoured
     Main Belt covers 108 % 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:   1.18" / 30 mm   1.18" / 30 mm      1.18" / 30 mm
   2nd:   0.59" / 15 mm   0.31" / 8 mm      0.31" / 8 mm
   3rd:   0.31" / 8 mm     -           -
   4th:   0.24" / 6 mm     -           -

- Protected deck - single deck:
   For and Aft decks: 1.38" / 35 mm
   Forecastle: 0.98" / 25 mm Quarter deck: 1.38" / 35 mm

- Conning towers: Forward 1.38" / 35 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 30,631 shp / 22,851 Kw = 28.00 kts
   Range 7,840nm at 14.00 kts
   Bunker at max displacement = 900 tons

Complement:
   235 - 306

Cost:
   £0.938 million / $3.750 million

Distribution of weights at normal displacement:
   Armament: 159 tons, 4.3 %
     - Guns: 159 tons, 4.3 %
   Armour: 595 tons, 16.2 %
     - Belts: 225 tons, 6.1 %
     - Armament: 58 tons, 1.6 %
     - Armour Deck: 305 tons, 8.3 %
     - Conning Tower: 7 tons, 0.2 %
   Machinery: 1,009 tons, 27.5 %
   Hull, fittings & equipment: 1,057 tons, 28.8 %
   Fuel, ammunition & stores: 675 tons, 18.4 %
   Miscellaneous weights: 180 tons, 4.9 %
     - Hull below water: 15 tons
     - Hull void weights: 29 tons
     - Hull above water: 3 tons
     - On freeboard deck: 76 tons
     - Above deck: 57 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,120 lbs / 1,415 Kg = 22.8 x 6.5 " / 165 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 1.8 ft / 0.5 m
   Roll period: 13.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.61
   Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.493 / 0.506
   Length to Beam Ratio: 9.60 : 1
   'Natural speed' for length: 20.49 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 59
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: -6.56 ft / -2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   20.00 %, 23.29 ft / 7.10 m, 20.83 ft / 6.35 m
     - Forward deck:   36.00 %, 20.83 ft / 6.35 m, 18.37 ft / 5.60 m
     - Aft deck:   34.00 %, 10.17 ft / 3.10 m, 10.17 ft / 3.10 m
     - Quarter deck:   10.00 %, 10.17 ft / 3.10 m, 10.17 ft / 3.10 m
     - Average freeboard:      15.90 ft / 4.85 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 105.8 %
      - Above water (accommodation/working, high = better): 148.0 %
   Waterplane Area: 12,159 Square feet or 1,130 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 56 lbs/sq ft or 273 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.70
      - Longitudinal: 1.35
      - Overall: 0.75
   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: Wrong mount for machine gun - 3rd Battery

Reserve :
34t

AD
16t - FC
25t - LR Radio
16t - Night Fighting

OD
5t - Paravanes
5t - Gunpowder CAT
25t - Fighter or Scoutfloatplane
36t - 4T3 21"
1t - ASW Kite
4t - Depthcharges

HAW
3t - CO2 Compressor AC

HBW
15t - Enhanced Hydrophone package

Kaiser Kirk · November 01, 2022, 09:06:28 PM

This version is slightly faster, like the prior one, protective deck with thickened slopes
here only 30+10 = 40mm slopes & 30mm crown, versus the other's 75mm slopes and 35mm crown.

What this one does is try to cram a whole bunch of floatplanes aft
and concentrates the guns forward.

I have concerns about the space, as it's not a big hull.
While I did try to address that keeping the aft
clear of guns, and so there's ~80.4m of room
with only the double raised 57AA in the way

Artesmia III , Parthian Frigate laid down 1924

Displacement:
   3,000 t light; 3,162 t standard; 3,771 t normal; 4,258 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (446.19 ft / 439.63 ft) x 43.73 ft x (15.29 / 16.68 ft)
   (136.00 m / 134.00 m) x 13.33 m x (4.66 / 5.08 m)

Armament:
4 - 6.50" / 165 mm 43.0 cal guns - 143.30lbs / 65.00kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1924 Model
     2 x 2-gun mounts on centreline, forward evenly spread
      1 raised mount
4 - 3.54" / 90.0 mm 50.0 cal guns - 24.25lbs / 11.00kg shells, 300 per gun
     Anti-air guns in deck mounts, 1924 Model
     4 x Single mounts on sides, forward deck aft
8 - 2.24" / 57.0 mm 45.0 cal guns - 5.70lbs / 2.59kg shells, 150 per gun
     Anti-air guns in deck and hoist mounts, 1924 Model
     2 x 2-gun mounts on sides amidships
      2 raised mounts
     2 x 2-gun mounts on centreline ends, evenly spread
      2 double raised mounts
16 - 0.59" / 15.0 mm 60.0 cal guns - 0.11lbs / 0.05kg shells, 3,000 per gun
     Machine guns in deck mounts, 1924 Model
     4 x 2 row quad mounts on sides, evenly spread
      4 raised mounts
Weight of broadside 718 lbs / 325 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   0.39" / 10 mm   327.26 ft / 99.75 m   12.01 ft / 3.66 m
   Ends:   Unarmoured
     Main Belt covers 115 % 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:   1.18" / 30 mm   1.18" / 30 mm      1.18" / 30 mm
   2nd:   0.59" / 15 mm     -           -
   3rd:   0.59" / 15 mm     -           -
   4th:   0.59" / 15 mm     -           -

- Protected deck - single deck:
   For and Aft decks: 1.18" / 30 mm
   Forecastle: 0.00" / 0 mm Quarter deck: 1.18" / 30 mm

- Conning towers: Forward 1.18" / 30 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 34,193 shp / 25,508 Kw = 29.00 kts
   Range 9,466nm at 14.00 kts
   Bunker at max displacement = 1,096 tons

Complement:
   239 - 312

Cost:
   £0.993 million / $3.974 million

Distribution of weights at normal displacement:
   Armament: 170 tons, 4.5 %
     - Guns: 170 tons, 4.5 %
   Armour: 354 tons, 9.4 %
     - Belts: 62 tons, 1.6 %
     - Armament: 31 tons, 0.8 %
     - Armour Deck: 255 tons, 6.8 %
     - Conning Tower: 6 tons, 0.2 %
   Machinery: 1,126 tons, 29.9 %
   Hull, fittings & equipment: 1,108 tons, 29.4 %
   Fuel, ammunition & stores: 771 tons, 20.4 %
   Miscellaneous weights: 241 tons, 6.4 %
     - Hull below water: 26 tons
     - Hull void weights: 20 tons
     - Hull above water: 9 tons
     - On freeboard deck: 127 tons
     - Above deck: 59 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,750 lbs / 1,247 Kg = 20.1 x 6.5 " / 165 mm shells or 0.8 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 1.8 ft / 0.6 m
   Roll period: 13.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.59
   Seaboat quality (Average = 1.00): 1.20

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.449 / 0.465
   Length to Beam Ratio: 10.05 : 1
   'Natural speed' for length: 20.97 kts
   Power going to wave formation at top speed: 56 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: -6.56 ft / -2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   15.00 %, 23.29 ft / 7.10 m, 20.83 ft / 6.35 m
     - Forward deck:   25.00 %, 20.83 ft / 6.35 m, 19.69 ft / 6.00 m
     - Aft deck:   50.00 %, 11.81 ft / 3.60 m, 11.81 ft / 3.60 m
     - Quarter deck:   10.00 %, 11.81 ft / 3.60 m, 11.81 ft / 3.60 m
     - Average freeboard:      15.42 ft / 4.70 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 113.5 %
      - Above water (accommodation/working, high = better): 142.9 %
   Waterplane Area: 12,254 Square feet or 1,138 Square metres
   Displacement factor (Displacement / loading): 111 %
   Structure weight / hull surface area: 58 lbs/sq ft or 283 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.70
      - Longitudinal: 1.33
      - Overall: 0.75
   Cramped 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: Wrong mount for machine gun - 3rd Battery

The Artesmia III reduces speed to 29 from 31 knots,
in favor of armor and heavier firepower. They introduce geared drives
and continue to have great range.

The 165mm guns are effective for HE shots at range, or to take advantage of aerial spotting, or can be used for good advantage in night fighting. The 165mm shells
are also quite lethal to destroyers.

Armor is meant to defeat QF guns and splinters.
Mounts are shielded and there is a 30mm protective deck with 40mm slopes.

The 165mm guns are concentrated forward, to leave the stern free for the aircraft
handling.

The 90mm are mounted at the 'corners' of the ship, allowing barrage fire to each side or forward.

The Two-twin GAST 15mm are mounted "above" these.

The 57mm guns are mounted high up fore & aft and amid ships, giving 6 guns in each direction.

All AA guns have shielded mounts.

The Aft part of the ship has two gunpowder cats, and pairs of Ftr and cout floatplanes.

Like many Parthian ships, a hydrophone array is fitted to allow sentries to listen for distant screws.
Depth charge throwers are arranged near the torpedoes at the waist, with small racks of DCs adjacent.

To keep the stern clear for aircraft, the aft stern rails are below deck, venting through hatches ont he stern.

Resv : 11

AD
17t FC
25t LR Radio
17t Night Fighting Gear

OD
5t : Paravanes
10t : Gunpowder Cat
50 : 2x Ftr Floatplane
40 : 2xScout Floatplane
18t : 2TT3 21" Torps
4t : 2x "Y" throwers a waist, 2t DC

HAW
3t - CO2 Compressor AC
6t - DC rails, venting stern

HBW
15t - Enhanced Hydrophones
10t - 1t doublewall tank, 9t avgas
1t - FireExt for tank

6.2
3.6
1.2
-1.6
-3.8 Engineering

TacCovert4 · November 02, 2022, 06:57:02 AM

It's definitely interesting. And built with some different philosophies to what drove the River-class Corvettes I'm building. 4 x 165 as opposed to 8 x 130. AA batteries are probably about equal in effectiveness. I guess I probably got gun shy about protected decks after the Caicos war proved how bad they are at keeping a ship alive and afloat when the shells start flying, though they do stop critical hits. I can't say you're wrong about the bigger guns, I might need to look at a 3000t class with 4 single 180s as a possibility.

Kaiser Kirk · November 02, 2022, 09:35:06 AM

I think I managed a 3x 180 on a 3000t hull.
As I recall, the difficulty I ran into was recoil forcing
a wider beam, which effected seakeeping & beam,
driving speed down.
All and all it fell down into more limited role
than I was looking for.

...I think I then turned it into a coastal frigate/
escort frigate design with a Marine platoon
and a 163mm Howitzer added.

TacCovert4 · November 02, 2022, 10:06:37 AM

Quote from: Kaiser Kirk on November 02, 2022, 09:35:06 AM
I think I managed a 3x 180 on a 3000t hull.
As I recall, the difficulty I ran into was recoil forcing
a wider beam, which effected seakeeping & beam,
driving speed down.
All and all it fell down into more limited role
than I was looking for.

...I think I then turned it into a coastal frigate/
escort frigate design with a Marine platoon
and a 163mm Howitzer added.

'

If I do it, it'll be more 1926 or beyond. And probably as a DD Leader cruiser. So, some sacrifices may wind up being made in the name of firepower.

Desertfox · November 02, 2022, 11:05:36 AM

Quote from: Kaiser Kirk on November 02, 2022, 09:35:06 AM
I think I managed a 3x 180 on a 3000t hull.
As I recall, the difficulty I ran into was recoil forcing
a wider beam, which effected seakeeping & beam,
driving speed down.
All and all it fell down into more limited role
than I was looking for.

...I think I then turned it into a coastal frigate/
escort frigate design with a Marine platoon
and a 163mm Howitzer added.

I did stuff 2x8" into 1500t...

Jefgte · November 02, 2022, 11:44:37 AM

The advantage of these cruiser/escort is their low cost.
They can be built in numbers so useful for colonies.

Byzantium studied this style of ship from 1700t to 4000t with 140 or 152.

TacCovert4 · November 02, 2022, 12:05:03 PM

Quote from: Jefgte on November 02, 2022, 11:44:37 AM
The advantage of these cruiser/escort is their low cost.
They can be built in numbers so useful for colonies.

Byzantium studied this style of ship from 1700t to 4000t with 140 or 152.

I'm thinking about them with the DD formations. And pulling the cruisers with proper armor schemes clear of the DDs for the cruiser fight given their value.

Kaiser Kirk · November 02, 2022, 11:31:49 PM

This I think is the 3x180 CE/Coastal Gunboat that I recalled.
Other versions have 165mm + 118 or 163mm Howitzers.

Again, protective deck 35mm with 80mm slopes , but vs short-medium range QF my main concern is critical hits.
My Artesemia IIs have a 35mm box over magazines so they don't go 'boom' but in any fight versus DDs/many cruisers, they can
easily be crippled.
As Tac mentions, Armor decks should have more flotation. I *try* to account for that by adding flotation for Armor Deck designs,
but that it prep time dependent. Protective decks have some other problems, but for stopping lots of 5"-5.5" rounds they are ok.

Anyhow this design was originally projected for 1923, now I really don't know when.

Porpoise, Parthian Colonial Frigate laid down 1923

Displacement:
   3,000 t light; 3,153 t standard; 3,770 t normal; 4,264 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (393.58 ft / 387.96 ft) x 51.67 ft x (14.44 / 15.78 ft)
   (119.96 m / 118.25 m) x 15.75 m x (4.40 / 4.81 m)

Armament:
3 - 7.09" / 180 mm 43.0 cal guns - 176.37lbs / 80.00kg shells, 200 per gun
     Breech loading guns in deck and hoist mounts, 1923 Model
     1 x Single mount on centreline forward
     2 x Single mounts on centreline ends, evenly spread
      2 raised mounts
8 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Anti-air guns in deck and hoist mounts, 1923 Model
     2 x Twin mounts on sides amidships
      2 raised mounts
     2 x Twin mounts on centreline ends, evenly spread
      2 double raised mounts
8 - 0.59" / 15.0 mm 60.0 cal guns - 0.11lbs / 0.05kg shells, 3,000 per gun
     Machine guns in deck mounts, 1923 Model
     4 x Twin mounts on side ends, evenly spread
      4 double raised mounts
Weight of broadside 583 lbs / 264 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.77" / 45 mm   252.17 ft / 76.86 m   12.01 ft / 3.66 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:   2.95" / 75 mm   1.38" / 35 mm      1.97" / 50 mm
   2nd:   0.24" / 6 mm     -           -

- Protected deck - single deck:
   For and Aft decks: 1.38" / 35 mm
   Forecastle: 0.00" / 0 mm Quarter deck: 1.38" / 35 mm

- Conning towers: Forward 1.97" / 50 mm, Aft 1.38" / 35 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 28,300 shp / 21,112 Kw = 27.00 kts
   Range 6,840nm at 16.00 kts
   Bunker at max displacement = 1,111 tons

Complement:
   239 - 312

Cost:
   £0.848 million / $3.393 million

Distribution of weights at normal displacement:
   Armament: 148 tons, 3.9 %
     - Guns: 148 tons, 3.9 %
   Armour: 587 tons, 15.6 %
     - Belts: 226 tons, 6.0 %
     - Armament: 43 tons, 1.1 %
     - Armour Deck: 300 tons, 8.0 %
     - Conning Towers: 17 tons, 0.5 %
   Machinery: 946 tons, 25.1 %
   Hull, fittings & equipment: 1,076 tons, 28.5 %
   Fuel, ammunition & stores: 770 tons, 20.4 %
   Miscellaneous weights: 243 tons, 6.4 %
     - Hull below water: 63 tons
     - Hull void weights: 45 tons
     - Hull above water: 15 tons
     - On freeboard deck: 55 tons
     - Above deck: 65 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,781 lbs / 1,715 Kg = 21.2 x 7.1 " / 180 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.22
   Metacentric height 2.7 ft / 0.8 m
   Roll period: 13.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.31
   Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.456 / 0.472
   Length to Beam Ratio: 7.51 : 1
   'Natural speed' for length: 19.70 kts
   Power going to wave formation at top speed: 60 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 17.00 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 %, 18.37 ft / 5.60 m, 15.91 ft / 4.85 m
     - Forward deck:   40.00 %, 15.91 ft / 4.85 m, 13.45 ft / 4.10 m
     - Aft deck:   25.00 %, 13.45 ft / 4.10 m, 13.45 ft / 4.10 m
     - Quarter deck:   15.00 %, 13.45 ft / 4.10 m, 13.45 ft / 4.10 m
     - Average freeboard:      14.63 ft / 4.46 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 98.2 %
      - Above water (accommodation/working, high = better): 145.5 %
   Waterplane Area: 12,851 Square feet or 1,194 Square metres
   Displacement factor (Displacement / loading): 116 %
   Structure weight / hull surface area: 61 lbs/sq ft or 296 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.70
      - Longitudinal: 1.34
      - Overall: 0.75
   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

Intended to replace the aged Dolphin gunboats in the far territories, the Porpoise is much like a USN Erie class.

The ship is given speed sufficient to work around the 20kt battleline if pressed into service. As a Close Escort it would serve as an intermediate screen against MTBs and DDs, while also being equipped to detect and prosecute ASW attacks.

Against attacking destroyers, the single 165mm battery is expected to wreck havok. Against smaller cruisers, it is expected to at least give reasonable "punch", as speed will be insufficient to choose range.

The protective deck is 75mm on the slopes and 35mm on the crown, which should make it immune to splinters under 200mm, and resistant to direct impacts.

Any offensive role would be at night, possibly as a follow up to an earlier attack. The Hulesmeyer device has not proved an effective early warning system, but is viewed as promising for night time formation steaming.

B and Y guns are superimposed to clear A and the aft depth charge deck respectively.
The Torpedo tubes bracke the aft superstructure, which houses the fire control for them.

(3)
A(B) [1] TT (TDC) TT [4] (Y) [Depth Charges]
(4)

The protective deck is 35mm on the flat and 80mm on the slopes. Giving protection against QF weapons, but HE and SAP.

Misc Wt
45- Reserve

15t - FC (16t)
25t - Hulesmeyer
25t - Seachlight tower (Night fighting)

3t : CO2 Compressor A/C Air conditioning
36t : 4 x T3 21" Torpedoes
16t : Depth charges

15t : Extra Fire Fighting

15t : Bow Enhanced Hydrophone station
15t : Amidships Enhanced Hydrophone Station
15t : Extra pumps
18t : Set torpedo reloads
5t : Batteries for silent hunting

Decks :
4.1m : Weather Deck
1.6m : Battery Deck - crown of protective deck
-0.9m : bottom protective deck. 1st Deck
-3.4m : Engineering deck
-4.4 m : Keel

Kaiser Kirk · November 26, 2022, 09:48:39 PM

Continuing the rebuilding of older ships to make passable 2nd class units,
the next up are the Simurgh class.

The Simurghs were conceptually a the Regina Elena, but with twin 13" main guns (345).

This is a refurbishment
It rearms the ship and adds additional deck armor, while replacing the engines.
The new turbo-electric drive will propel the ship at 24knots.
This 23+ knot range is what the Rustam ACs can do allowing them to partner.
The expectation is that for longer distance fights, the 18cm will be used
to make the range ladder, while the 333mm fire for effect.

Reconstruction would allow moving internal bulkheads and installing a TDS, though
it would require dropping speed to 22knots.
While tempting simply because I want my ships to be very torpedo resistant,
the 23-24knot speed allows a 2-3knot margin over bigger, older 21knot ships.

So instead they will rely on maneuverability, compartmentalization, and potentially
those 66% effective torpedo nets.

Simurgh, Parthian Battleship laid down 1904 (Engine 1924)

Displacement:
   18,477 t light; 19,579 t standard; 20,924 t normal; 22,001 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (493.77 ft / 487.20 ft) x 86.94 ft (Bulges 93.50 ft) x (28.71 / 29.97 ft)
   (150.50 m / 148.50 m) x 26.50 m (Bulges 28.50 m) x (8.75 / 9.13 m)

Armament:
4 - 13.11" / 333 mm 43.0 cal guns - 1,311.75lbs / 595.00kg shells, 96 per gun
     Breech loading guns in turret on barbette mounts, 1917 Model
     2 x Twin mounts on centreline ends, evenly spread
16 - 7.09" / 180 mm 43.0 cal guns - 187.39lbs / 85.00kg shells, 197 per gun
     Breech loading guns in turret on barbette mounts, 1913 Model
     2 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     6 x Twin mounts on sides, evenly spread
      2 raised mounts
8 - 3.54" / 90.0 mm 50.0 cal guns - 23.55lbs / 10.68kg shells, 600 per gun
     Anti-air guns in deck and hoist mounts, 1911 Model
     4 x 2-gun mounts on side ends, evenly spread
      4 double raised mounts
4 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Anti-air guns in deck and hoist mounts, 1919 Model
     2 x 2-gun mounts on centreline ends, evenly spread
      2 double raised mounts
16 - 0.59" / 15.0 mm 70.0 cal guns - 0.12lbs / 0.05kg shells, 3,000 per gun
     Machine guns in deck mounts, 1917 Model
     8 x Single mounts on sides, evenly spread
Weight of broadside 8,462 lbs / 3,838 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   14.2" / 360 mm   316.67 ft / 96.52 m   9.84 ft / 3.00 m
   Ends:   1.38" / 35 mm   170.51 ft / 51.97 m   8.20 ft / 2.50 m
   Upper:   5.31" / 135 mm   316.67 ft / 96.52 m   10.99 ft / 3.35 m
     Main Belt covers 100 % of normal length

- Hull Bulges:
      0.35" / 9 mm   323.23 ft / 98.52 m   24.44 ft / 7.45 m

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   14.4" / 365 mm   6.50" / 165 mm      13.6" / 345 mm
   2nd:   5.91" / 150 mm   1.97" / 50 mm      5.31" / 135 mm
   3rd:   1.38" / 35 mm   0.98" / 25 mm      0.98" / 25 mm
   4th:   0.98" / 25 mm     -           -

- Protected deck - multiple decks:
   For and Aft decks: 6.10" / 155 mm
   Forecastle: 1.57" / 40 mm Quarter deck: 3.15" / 80 mm

- Conning towers: Forward 14.17" / 360 mm, Aft 2.95" / 75 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 50,873 shp / 37,951 Kw = 24.00 kts
   Range 7,200nm at 14.00 kts
   Bunker at max displacement = 2,422 tons

Complement:
   869 - 1,130

Cost:
   £1.548 million / $6.193 million

Distribution of weights at normal displacement:
   Armament: 1,399 tons, 6.7 %
     - Guns: 1,399 tons, 6.7 %
   Armour: 7,880 tons, 37.7 %
     - Belts: 2,847 tons, 13.6 %
     - Bulges: 104 tons, 0.5 %
     - Armament: 1,637 tons, 7.8 %
     - Armour Deck: 3,013 tons, 14.4 %
     - Conning Towers: 280 tons, 1.3 %
   Machinery: 1,676 tons, 8.0 %
   Hull, fittings & equipment: 6,410 tons, 30.6 %
   Fuel, ammunition & stores: 2,447 tons, 11.7 %
   Miscellaneous weights: 1,112 tons, 5.3 %
     - Hull below water: 593 tons
     - Bulge void weights: 200 tons
     - Hull above water: 44 tons
     - On freeboard deck: 50 tons
     - Above deck: 225 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     32,543 lbs / 14,761 Kg = 28.9 x 13.1 " / 333 mm shells or 4.2 torpedoes
   Stability (Unstable if below 1.00): 1.26
   Metacentric height 6.2 ft / 1.9 m
   Roll period: 15.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.35
   Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.560 / 0.564
   Length to Beam Ratio: 5.21 : 1
   'Natural speed' for length: 22.07 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): -15.00 degrees
   Stern overhang: -6.56 ft / -2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   20.00 %, 24.28 ft / 7.40 m, 21.98 ft / 6.70 m
     - Forward deck:   35.00 %, 21.98 ft / 6.70 m, 19.69 ft / 6.00 m
     - Aft deck:   30.00 %, 11.48 ft / 3.50 m, 11.48 ft / 3.50 m
     - Quarter deck:   15.00 %, 11.48 ft / 3.50 m, 11.48 ft / 3.50 m
     - Average freeboard:      17.04 ft / 5.19 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 60.2 %
      - Above water (accommodation/working, high = better): 108.0 %
   Waterplane Area: 29,840 Square feet or 2,772 Square metres
   Displacement factor (Displacement / loading): 112 %
   Structure weight / hull surface area: 164 lbs/sq ft or 801 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.13
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room

REFURBISHMENT

Base Cost : $17 * 0.20 = $3.4
armanent & machinery = 1499.5+1676=3175.5 = 3.1755 BP, $6.351
armor & functional misc wt = 1874+912=2786 = 2.786 BP, $2.786
Hull, fittings, & equipment = 6514/5000= $1.3028
Fuel, ammo, stores, NF Misc wt = 2422+683+200 =3305/2000=$1.6525

Subtotals : 5.9615 BP, $15.4923

Total : 5.96 BP, $ 15.49

(see details below)

Original engines : 2312
Original Fuel : 2560
Original Main Mag : 280
Original Armor Deck : 1817
Original Hull : 5915

New Misc wt: 1112 (912 func)
Reserve : 200

AD
140t Fire Control
25t LR Radio
10t SR Radio dedicated aircraft
25t Hulesmeyer
25t Searchlight Tower (NF)

OD
5t Paravanes
5t Gunpowder Cat tranverse mounting
40t 2x Scout Floatplane

HAW
25t Enhanced Fire Suppression
19t CO2 compressor AC

HBW
25t Enhanced Pumps
149t Torpedo Nets
419t Turboelectric Generator

A) Armanent and Machinery :
- New Steam Turboelec Turbines 24kts : 1676

New main gun turrets - 333L43
Gun + Mounts : 729
180L45-> 180L43 : 700t
Weld shut 90mm casements : --
Install 90mm AA :59
Install 57mm AA :10.4
intall 15mm MG : 1.4
-----
1499.5

2) Armor & func wt
333L43 Turret :252t
180L43 turrets :176
90mm : 25
57mm : 2
subtotal : 455

Decks
+10mm fore
+10mm upper
+50mm main, stern
New Deck : 3013 : +1196
Vert :(30+10*.8)/2 + (60+50*.8) = 128
Waterline : 360+ (60+50*.8) =460mm
New Aft Con : 48t
Replace endbelts with 35mm : 71t
"bulge armor" : 104t

Funct Misc Wt :912

3) Hull
- Reconfigured 'cleaver bow' (aka +13 instead of -15)
+1.0m blisters each side, 9mm skin , 7.45m deep bottom belt to keel.
New Hull : 6514

4)
Bunker: 2422
Mags : 683
NF Misc Wt : 200

Upper belt : The main belt rises 0.5m above the main protective deck. The remaining distance to freeboard is covered by the upperbelt. 54% of the upper belt is 2 decks (5m) high, and 46% is 1 deck (2.5m) high. This means 54% is 4.5m high, and 46% is 2m high, for an average of 3.35m high.

Kaiser Kirk · November 26, 2022, 10:29:06 PM

With 1923.5, the Parthians finished the 1920 Subs/ASW,
So they will be fielding new ships to feature some of this equipment.

The existing PS-1 Sentry class has 56 built or building
They are meant for Patrol/ASW/MS for coastal waters
and near harbors. Combined with the dedicated
minesweepers, it's a goodly number of small patrol
craft, being augmented by the new GNAT hulls.

The PS-2 adds sonar and squadron plot abilities
with the idea of serving as a lead vessel for the PS-1 divisions.

I don't like the small Depth Charge loadout though.
The larger DCs effect more volume and damage so the smaller
number should be more effective,
but ...I'd like more DCs.

So I may try a larger version of the ship,
pay a tad more, and fit more DCs on it.

Sentry PS-2, Parthian Senty Class Sloop laid down 1924

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

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 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
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

Miscellaneous Weights :
AD :
25t LR radio
1t : FC
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

Kaiser Kirk · November 26, 2022, 10:57:15 PM

This is a larger version of PS-2,

The basic problem is to fit even a little more armament Misc wt, the
ship size has to come up a fair bit.

WW1 Destroyers frequently had very few DCs
so the 12 of the preceeding class isn't ...bad...
but does put a limit on things.
So I want to double it.

But 4 extra tons of DCs takes nearly 200 tons light to fit

With the Misc wt up to 85 tons, I may subdivide
that into a Marine squad and landing boats,
as I want these ships peacetime role
of 'Coast Guard' and supporting
land forces to some degree. With the draft,
they should be able to go up most rivers quite
a way.

Sentry PS-2, Parthian Senty Class Sloop laid down 1924

Displacement:
   776 t light; 797 t standard; 851 t normal; 894 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (263.93 ft / 259.19 ft) x 29.53 ft x (8.73 / 9.04 ft)
   (80.45 m / 79.00 m) x 9.00 m x (2.66 / 2.75 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, 2,566 ihp / 1,915 Kw = 18.00 kts
   Range 3,000nm at 10.00 kts
   Bunker at max displacement = 97 tons (23% coal)

Complement:
   78 - 102

Cost:
   £0.154 million / $0.618 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 0.7 %
     - Guns: 6 tons, 0.7 %
   Armour: 1 tons, 0.1 %
     - Armament: 1 tons, 0.1 %
   Machinery: 152 tons, 17.8 %
   Hull, fittings & equipment: 363 tons, 42.7 %
   Fuel, ammunition & stores: 75 tons, 8.8 %
   Miscellaneous weights: 255 tons, 30.0 %
     - Hull below water: 74 tons
     - Hull void weights: 10 tons
     - Hull above water: 86 tons
     - On freeboard deck: 34 tons
     - Above deck: 51 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,756 lbs / 797 Kg = 79.0 x 3.5 " / 90 mm shells or 0.8 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 12.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.06
   Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.446 / 0.453
   Length to Beam Ratio: 8.78 : 1
   'Natural speed' for length: 16.10 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   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 %, 17.72 ft / 5.40 m, 17.55 ft / 5.35 m
     - Forward deck:   30.00 %, 17.55 ft / 5.35 m, 17.39 ft / 5.30 m
     - Aft deck:   35.00 %, 9.19 ft / 2.80 m, 9.19 ft / 2.80 m
     - Quarter deck:   15.00 %, 9.19 ft / 2.80 m, 9.19 ft / 2.80 m
     - Average freeboard:      13.36 ft / 4.07 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 81.0 %
      - Above water (accommodation/working, high = better): 154.6 %
   Waterplane Area: 4,866 Square feet or 452 Square metres
   Displacement factor (Displacement / loading): 148 %
   Structure weight / hull surface area: 38 lbs/sq ft or 187 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 3.93
      - 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

Warning: Beam between bulkheads too wide

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.

Reciprocating engines are used, while less reliable than turbines,
they are simpler to maintain.

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 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
Armanent : 2% of Normal
851t x 0.02 = 17

-6t guns (note, 3mm "armor" is not armor, just spray shields)
=11 tons for ASW weapons.

1t ASW Paravane
1t "Y" Thrower
1t 10x 100kg Stick bombs for main 90mm gun
8t 24x 280g DCs

= 11 tons ASW weapons

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

OD :
1t : ASW Paravanes
8t : 24x 280kg DC.
25t Minesweeping gear

HAW:
85t Miscellaneous Cargo
1t CO2 compessor AC

Hull below water:
1t 10x 100kg "stick bombs" for 90mm gun
10t Basic Sonar
15t "Enhanced Hydrophone Package".
38t Turbo-electric generators
10t Batteries

TacCovert4 · November 27, 2022, 10:53:01 AM

Do you have the 1920 cruiser tech? That tech really helps sloops and mine warfare vessels. Since anything built to that tech that's small only needs to be .75 comp you get a lot of leeway for misc weight. Not like a 500 ton ship is going to survive in a firefight whether it's got .5, .75 or 1.0 hull strength.....so might as well build it a tad lighter and get the ASW and AA on it.