Vilnius Union Ships, 1930+: The Good, The Bad, and the Unseaworthy

The Rock Doctor · January 06, 2025, 07:35:55 PM

The 1931 coastal escort is a bit longer than than the previous type, adding a bit more fuel and heavier 25mm machine-guns and a bit more miscellaneous weight. I'll divvy up the miscellaneous weight later, but it'd be pretty similar to the 1931 distribution.

Enter ship name, Enter country Enter ship type laid down 1936

Displacement:
   267 t light; 289 t standard; 314 t normal; 334 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (163.57 ft / 154.20 ft) x 19.69 ft x (7.87 / 8.23 ft)
   (49.86 m / 47.00 m) x 6.00 m x (2.40 / 2.51 m)

Armament:
1 - 2.95" / 75.0 mm 45.0 cal gun - 12.98lbs / 5.89kg shells, 400 per gun
     Dual purpose gun in deck mount, 1936 Model
     1 x Single mount on centreline, forward deck forward
      1 raised mount
2 - 1.97" / 50.0 mm 60.0 cal guns - 4.18lbs / 1.89kg shells, 1,500 per gun
     Anti-air guns in deck mount, 1936 Model
     1 x Twin mount on centreline, aft deck centre
      1 raised mount
4 - 0.98" / 25.0 mm 70.0 cal guns - 0.53lbs / 0.24kg shells, 5,000 per gun
     Machine guns in deck mounts, 1936 Model
     2 x Twin mounts on sides amidships
      2 raised mounts
Weight of broadside 23 lbs / 11 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm   0.12" / 3 mm        -
   2nd:   0.79" / 20 mm   0.12" / 3 mm        -
   3rd:   0.59" / 15 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 2,949 shp / 2,200 Kw = 20.42 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 45 tons

Complement:
   36 - 48

Cost:
   £0.119 million / $0.475 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 1.7 %
     - Guns: 5 tons, 1.7 %
   Armour: 3 tons, 1.0 %
     - Armament: 3 tons, 1.0 %
   Machinery: 83 tons, 26.3 %
   Hull, fittings & equipment: 95 tons, 30.2 %
   Fuel, ammunition & stores: 47 tons, 15.0 %
   Miscellaneous weights: 81 tons, 25.8 %
     - Hull below water: 25 tons
     - Hull above water: 6 tons
     - On freeboard deck: 47 tons
     - Above deck: 3 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     293 lbs / 133 Kg = 22.8 x 3.0 " / 75 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 0.5 ft / 0.2 m
   Roll period: 11.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 61 %
         - Recoil effect (Restricted arc if above 1.00): 0.23
   Seaboat quality (Average = 1.00): 1.49

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.460 / 0.468
   Length to Beam Ratio: 7.83 : 1
   'Natural speed' for length: 12.42 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 41
   Bow angle (Positive = bow angles forward): 20.00 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 %, 16.73 ft / 5.10 m, 12.80 ft / 3.90 m
     - Forward deck:   20.00 %, 12.80 ft / 3.90 m, 8.86 ft / 2.70 m
     - Aft deck:   45.00 %, 8.86 ft / 2.70 m, 8.86 ft / 2.70 m
     - Quarter deck:   15.00 %, 8.86 ft / 2.70 m, 8.86 ft / 2.70 m
     - Average freeboard:      10.35 ft / 3.16 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 106.2 %
      - Above water (accommodation/working, high = better): 97.8 %
   Waterplane Area: 1,952 Square feet or 181 Square metres
   Displacement factor (Displacement / loading): 119 %
   Structure weight / hull surface area: 21 lbs/sq ft or 103 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.59
      - Longitudinal: 6.40
      - Overall: 0.75
   Caution: Hull subject to strain in open-sea
   Adequate machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Good seaboat, rides out heavy weather easily

The Rock Doctor · January 07, 2025, 06:22:43 PM

The 1936 korweta is built on an slightly stretched Type 1932 hull, with a longer, more gradual slope up to the bow that might help with seakeeping. Not that SS thinks it has a seakeeping problem, but it is a small ship operating on some fairly stormy coastlines.

This allows for additional bunkerage; it also allows the superstructure to be elongated in order to accommodate a destroyer-scale Huelsmeyer device, which will help with a host of patrol and ASW functions.

The armament is largely unchanged, except that 25mm guns replace the 15mm mountings of previous types. Consideration was given to fitting a couple of 450mm torpedoes but deck space is already tight and the focus of the ship is ASW.

Enter ship name, Enter country Enter ship type laid down 1936

Displacement:
   499 t light; 538 t standard; 620 t normal; 685 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (189.28 ft / 176.84 ft) x 24.61 ft x (10.17 / 10.96 ft)
   (57.69 m / 53.90 m) x 7.50 m x (3.10 / 3.34 m)

Armament:
2 - 3.94" / 100 mm 45.0 cal guns - 30.78lbs / 13.96kg shells, 400 per gun
     Dual purpose guns in deck mounts, 1936 Model
     2 x Single mounts on centreline ends, evenly spread
2 - 1.97" / 50.0 mm 60.0 cal guns - 4.19lbs / 1.90kg shells, 1,500 per gun
     Anti-air guns in deck mount, 1936 Model
     1 x Twin mount on centreline, aft deck centre
      1 raised mount
4 - 0.98" / 25.0 mm 70.0 cal guns - 0.53lbs / 0.24kg shells, 5,000 per gun
     Machine guns in deck mounts, 1936 Model
     2 x Twin mounts on sides amidships
      2 raised mounts
Weight of broadside 72 lbs / 33 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.12" / 3 mm        -
   2nd:   0.59" / 15 mm     -           -
   3rd:   0.59" / 15 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Electric cruising motors plus geared drives, 2 shafts, 5,362 shp / 4,000 Kw = 21.46 kts
   Range 3,000nm at 15.00 kts
   Bunker at max displacement = 146 tons

Complement:
   61 - 80

Cost:
   £0.224 million / $0.895 million

Distribution of weights at normal displacement:
   Armament: 15 tons, 2.4 %
     - Guns: 15 tons, 2.4 %
   Armour: 4 tons, 0.7 %
     - Armament: 4 tons, 0.7 %
   Machinery: 150 tons, 24.3 %
   Hull, fittings & equipment: 216 tons, 34.8 %
   Fuel, ammunition & stores: 120 tons, 19.4 %
   Miscellaneous weights: 114 tons, 18.4 %
     - Hull below water: 63 tons
     - On freeboard deck: 34 tons
     - Above deck: 17 tons

Fittings:
-38 t: Electric drive (BW)
-25 t: Sonar and EHP (BW)
-20 t: 4 depth-charge throwers and a bunch of depth charges (FD)
-14 t: Weight reserve (FD)
-5 t: Night-fighting doodads (AD)
-10 t: Destroyer-sized Huelsmeyer device (AD)
-2 t: 1935 fire control (AD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     774 lbs / 351 Kg = 25.4 x 3.9 " / 100 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 0.8 ft / 0.2 m
   Roll period: 11.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.32
   Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.490 / 0.502
   Length to Beam Ratio: 7.19 : 1
   'Natural speed' for length: 13.30 kts
   Power going to wave formation at top speed: 69 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 4.92 ft / 1.50 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   20.00 %, 20.67 ft / 6.30 m, 17.72 ft / 5.40 m
     - Forward deck:   20.00 %, 17.72 ft / 5.40 m, 15.75 ft / 4.80 m
     - Aft deck:   45.00 %, 15.75 ft / 4.80 m, 15.75 ft / 4.80 m
     - Quarter deck:   15.00 %, 15.75 ft / 4.80 m, 15.75 ft / 4.80 m
     - Average freeboard:      16.57 ft / 5.05 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 100.1 %
      - Above water (accommodation/working, high = better): 144.0 %
   Waterplane Area: 2,873 Square feet or 267 Square metres
   Displacement factor (Displacement / loading): 136 %
   Structure weight / hull surface area: 25 lbs/sq ft or 124 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.52
      - Longitudinal: 18.82
      - Overall: 0.75
   Caution: Hull subject to strain in open-sea
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Jefgte · January 08, 2025, 12:41:24 AM

Quote...Consideration was given to fitting a couple of 450mm torpedoes but deck space is already tight and the focus of the ship is ASW.

2 torpedoes could be useful though. Lengthens the hull if you could.

The Rock Doctor · January 08, 2025, 05:50:09 PM

A specialized training vessel for two things:

-Torpedo handling and firing
-Modern, light, high-speed machinery

The armament is a bit eclectic. The triple 530mm carriage permits training in salvo-firing of the primary Union torpedoes, as well as testing of experimental models of the same size. The triple 450mm carriage allows similar training, but with less expensive training weapons that are easier to retrieve after the fact. The single 450mm tube is much like the singles found on small craft like coastal escorts and MTBs.

The ship is otherwise very lightly armed for self-defence. Two cranes are provided for torpedo retrieval, but it's more likely that smaller, slower, less expensive recovery vessels would be built for this purpose.

The powerplant, while not of the size and scale installed in modern torpedo-boats, is still top-of-the-line machinery and a good hands-on training tool for engine room personnel. It's simultaneously more delicate than that found in other training vessels and also much more modern than would be available if a surplus torpedo-boat were to be taken out of service.

Just a single unit anticipated for construction; it's unlikely it would ever leave the Baltic. The ship is costed as a warship, given that it can fire a bunch of torpedoes, even though it is considered an auxiliary in functional terms.

Enter ship name, Enter country Enter ship type laid down 1936

Displacement:
494 t light; 518 t standard; 565 t normal; 603 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(236.41 ft / 226.38 ft) x 21.65 ft x (9.84 / 10.28 ft)
(72.06 m / 69.00 m) x 6.60 m x (3.00 / 3.13 m)

Armament:
2 - 1.97" / 50.0 mm 60.0 cal guns - 4.18lbs / 1.89kg shells, 1,500 per gun
Anti-air guns in deck mount, 1936 Model
1 x Twin mount on centreline, forward deck centre
4 - 0.98" / 25.0 mm 70.0 cal guns - 0.53lbs / 0.24kg shells, 5,000 per gun
Machine guns in deck mounts, 1936 Model
2 x Twin mounts on sides, aft deck forward
2 raised mounts
Weight of broadside 10 lbs / 5 kg

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
2nd: 0.59" / 15 mm - -
3rd: 0.59" / 15 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 16,085 shp / 12,000 Kw = 29.81 kts
Range 2,000nm at 15.00 kts
Bunker at max displacement = 85 tons

Complement:
57 - 75

Cost:
£0.306 million / $1.223 million

Distribution of weights at normal displacement:
Armament: 3 tons, 0.5 %
- Guns: 3 tons, 0.5 %
Armour: 2 tons, 0.3 %
- Armament: 2 tons, 0.3 %
Machinery: 284 tons, 50.2 %
Hull, fittings & equipment: 162 tons, 28.6 %
Fuel, ammunition & stores: 71 tons, 12.6 %
Miscellaneous weights: 44 tons, 7.8 %
- On freeboard deck: 41 tons
- Above deck: 3 tons

Fittings:
-12 t: 1x3 heavyweight 530mm torpedo carriage, no reloads (forward-most)
-6 t: 1x3 450mm torpedo carriage, no reloads (amidships)
-2 t: 1x1 450mm torpedo carriage, no reloads (aft)
-8 t: Torpedo retrieval cranes
-13 t: Weight reserve
-1 t: Fire control (AD)
-2 t: Nightfighting doodads (AD)

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
163 lbs / 74 Kg = 1.5 x 6 " / 152 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.1 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.05
Seaboat quality (Average = 1.00): 0.92

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.410 / 0.419
Length to Beam Ratio: 10.45 : 1
'Natural speed' for length: 15.05 kts
Power going to wave formation at top speed: 71 %
Trim (Max stability = 0, Max steadiness = 100): 65
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.94 ft / 1.20 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 16.73 ft / 5.10 m, 11.81 ft / 3.60 m
- Forward deck: 30.00 %, 11.81 ft / 3.60 m, 9.84 ft / 3.00 m
- Aft deck: 35.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
- Quarter deck: 15.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
- Average freeboard: 10.93 ft / 3.33 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 166.2 %
- Above water (accommodation/working, high = better): 104.5 %
Waterplane Area: 3,036 Square feet or 282 Square metres
Displacement factor (Displacement / loading): 59 %
Structure weight / hull surface area: 22 lbs/sq ft or 109 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 3.30
- Overall: 0.60
Cramped machinery, storage, compartmentation space
Adequate accommodation and workspace room
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

The Rock Doctor · January 08, 2025, 07:51:47 PM

Technically a torpedo recovery vessel, but with a decent crane and some cargo capacity, this little tub could probably handle torpedoes, mines, and/or nets, and undertake other modest utility work in the vicinity of a harbour.

Given the theoretical ability to lay mines, I'll cost it as a warship.

Enter ship name, Enter country Enter ship type laid down 1936

Displacement:
46 t light; 48 t standard; 48 t normal; 49 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(70.63 ft / 65.62 ft) x 13.12 ft x (3.28 / 3.30 ft)
(21.53 m / 20.00 m) x 4.00 m x (1.00 / 1.01 m)

Armament:
1 - 0.98" / 25.0 mm 70.0 cal gun - 0.53lbs / 0.24kg shells, 2,000 per gun
Machine gun in deck mount, 1936 Model
1 x Twin mount on centreline, forward deck centre
Weight of broadside 1 lbs / 0 kg

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

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 135 shp / 100 Kw = 11.23 kts
Range 100nm at 10.00 kts
Bunker at max displacement = 1 tons

Complement:
8 - 11

Cost:
£0.012 million / $0.047 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.3 %
- Guns: 0 tons, 0.3 %
Armour: 1 tons, 1.3 %
- Armament: 1 tons, 1.3 %
Machinery: 4 tons, 7.8 %
Hull, fittings & equipment: 14 tons, 28.5 %
Fuel, ammunition & stores: 2 tons, 4.3 %
Miscellaneous weights: 28 tons, 57.8 %
- Hull below water: 2 tons
- On freeboard deck: 18 tons
- Above deck: 8 tons

Fittings:
-2 t: D-E machinery (BW)
-18 t: Cargo (torpedoes, mines, etc) (FD)
-8 t: Crane and bracing, 4 t capacity (AD)

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
187 lbs / 85 Kg = 1.7 x 6 " / 152 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 0.3 ft / 0.1 m
Roll period: 10.2 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 1.82

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.600 / 0.601
Length to Beam Ratio: 5.00 : 1
'Natural speed' for length: 8.10 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 33
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 %, 9.84 ft / 3.00 m, 7.87 ft / 2.40 m
- Forward deck: 20.00 %, 7.87 ft / 2.40 m, 5.91 ft / 1.80 m
- Aft deck: 45.00 %, 5.91 ft / 1.80 m, 5.91 ft / 1.80 m
- Quarter deck: 15.00 %, 5.91 ft / 1.80 m, 5.91 ft / 1.80 m
- Average freeboard: 6.65 ft / 2.03 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 34.0 %
- Above water (accommodation/working, high = better): 93.1 %
Waterplane Area: 630 Square feet or 59 Square metres
Displacement factor (Displacement / loading): 131 %
Structure weight / hull surface area: 11 lbs/sq ft or 53 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.57
- Longitudinal: 10.15
- Overall: 0.76
Caution: Hull subject to strain in open-sea
Excellent machinery, storage, compartmentation space
Adequate accommodation and workspace room
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

The Rock Doctor · January 10, 2025, 04:27:00 PM

The Zuraw class aircraft carriers will provide the Union Navy with a strike capability not prioritized with earlier carrier types. The armament is heavier, the hanger floo deck armor and underwater protection is heavier, and a small transom stern makes the machinery a bit more effective. Otherwise, the evolution from the preceding Hydry class should be fairly evident.

Airgroup would likely 32 fighters, 16 torpedo-bombers and 16 scout-bombers. An additional four aircraft can be embarked as deck-park, and these would most likely be spare, assembled airframes to replace losses.

Enter ship name, Enter country Enter ship type laid down 1936

Displacement:
   26,988 t light; 27,931 t standard; 30,434 t normal; 32,436 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (817.00 ft / 768.37 ft) x 98.43 ft x (26.57 / 27.90 ft)
   (249.02 m / 234.20 m) x 30.00 m x (8.10 / 8.50 m)

Armament:
16 - 5.12" / 130 mm 45.0 cal guns - 67.62lbs / 30.67kg shells, 400 per gun
     Dual purpose guns in deck and hoist mounts, 1936 Model
     8 x 2-gun mounts on side ends, evenly spread
4 - 1.97" / 50.0 mm 60.0 cal guns - 4.19lbs / 1.90kg shells, 1,500 per gun
     Anti-air guns in deck mounts, 1936 Model
     2 x 2-gun mounts on sides amidships
      2 double raised mounts
16 - 1.97" / 50.0 mm 60.0 cal guns - 4.19lbs / 1.90kg shells, 1,500 per gun
     Anti-air guns in deck mounts, 1936 Model
     8 x Twin mounts on sides, evenly spread
16 - 0.98" / 25.0 mm 70.0 cal guns - 0.53lbs / 0.24kg shells, 5,000 per gun
     Machine guns in deck mounts, 1936 Model
     16 x Single mounts on sides, evenly spread
Weight of broadside 1,174 lbs / 533 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.94" / 100 mm   514.80 ft / 156.91 m   16.37 ft / 4.99 m
   Ends:   Unarmoured
     Main Belt covers 103 % of normal length

- Torpedo Bulkhead - Additional damage containing bulkheads:
      2.95" / 75 mm   514.80 ft / 156.91 m   24.05 ft / 7.33 m
   Beam between torpedo bulkheads 68.90 ft / 21.00 m

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm   1.18" / 30 mm      1.97" / 50 mm
   2nd:   0.59" / 15 mm     -           -
   3rd:   0.59" / 15 mm     -           -
   4th:   0.59" / 15 mm     -           -

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 146,783 shp / 109,500 Kw = 32.00 kts
   Range 10,000nm at 15.00 kts
   Bunker at max displacement = 4,506 tons

Complement:
   1,151 - 1,497

Cost:
   £8.603 million / $34.412 million

Distribution of weights at normal displacement:
   Armament: 335 tons, 1.1 %
     - Guns: 335 tons, 1.1 %
   Armour: 5,702 tons, 18.7 %
     - Belts: 1,396 tons, 4.6 %
     - Torpedo bulkhead: 1,353 tons, 4.4 %
     - Armament: 104 tons, 0.3 %
     - Armour Deck: 2,849 tons, 9.4 %
   Machinery: 4,118 tons, 13.5 %
   Hull, fittings & equipment: 9,732 tons, 32.0 %
   Fuel, ammunition & stores: 3,446 tons, 11.3 %
   Miscellaneous weights: 7,101 tons, 23.3 %
     - Hull below water: 3,246 tons
     - Hull above water: 3,230 tons
     - On freeboard deck: 225 tons
     - Above deck: 400 tons

Fittings:
-3,230 t +3,230 t: 68 post-1933 aircraft (BW/AW)
-16 t: 4x1 fixed 530mm torpedo tubes, aft (BW)
-75 t: 3 steam catapults (2 bow, 1 waist) (FD)
-100 t: Fliag facilities (FD)
-34 t: Fire control (AD)
-100 t: Flight operations (AD)
-25 t: Huelsmeyer device (AD)
-10 t: Nightfighting doodads (AD)
-60 t: Redundant L/R + extra S/R wireless (AD)
-50 + 171 t: Weight reserve (FD/AD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     59,751 lbs / 27,103 Kg = 891.3 x 5.1 " / 130 mm shells or 9.0 torpedoes
   Stability (Unstable if below 1.00): 1.32
   Metacentric height 8.1 ft / 2.5 m
   Roll period: 14.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 90 %
         - Recoil effect (Restricted arc if above 1.00): 0.07
   Seaboat quality (Average = 1.00): 1.58

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and small transom stern
   Block coefficient (normal/deep): 0.530 / 0.538
   Length to Beam Ratio: 7.81 : 1
   'Natural speed' for length: 30.02 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 57
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 36.09 ft / 11.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   18.00 %, 34.45 ft / 10.50 m, 29.53 ft / 9.00 m
     - Forward deck:   30.00 %, 29.53 ft / 9.00 m, 29.53 ft / 9.00 m
     - Aft deck:   37.00 %, 29.53 ft / 9.00 m, 29.53 ft / 9.00 m
     - Quarter deck:   15.00 %, 29.53 ft / 9.00 m, 29.53 ft / 9.00 m
     - Average freeboard:      29.88 ft / 9.11 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 102.9 %
      - Above water (accommodation/working, high = better): 259.3 %
   Waterplane Area: 53,065 Square feet or 4,930 Square metres
   Displacement factor (Displacement / loading): 138 %
   Structure weight / hull surface area: 128 lbs/sq ft or 625 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.48
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

68 post-1933 planes by weight
64 by waterplane, one hanger

The Rock Doctor · January 15, 2025, 06:19:59 PM

I'm encountering an unexpected issue with my planned refurbishment of the Szermierz ACs.

Like the Angstrom class battleships, I'm replacing the triple 350mm in the superfiring position with a 2-gun turret. Same gun, same shell size, same shell per gun count.

The weight of the 2-gun turret is less than the weight of the triple turret, so by the guidelines we have, there shouldn't be any problem with this for a refurbishment.

On the other hand, for reasons I don't understand, the weight of the barbette armor for the 2-gun installation is greater than the barbette armor for the original triple turret. That's with it staying in the same location, with the armor thickness remaining constant, with a smaller turret on top, and with less (100 shells/gun for 2 guns, not 3) shells inside.

I don't get it. But does it invalidate the refurbishment itself? I'm content to pay for the entirety of the larger barbette if need be. I just don't comprehend why it's an issue for SS.

Jeremy · January 15, 2025, 08:11:39 PM

Quote from: The Rock Doctor on January 15, 2025, 06:19:59 PMI'm encountering an unexpected issue with my planned refurbishment of the Szermierz ACs.

Like the Angstrom class battleships, I'm replacing the triple 350mm in the superfiring position with a 2-gun turret. Same gun, same shell size, same shell per gun count.

The weight of the 2-gun turret is less than the weight of the triple turret, so by the guidelines we have, there shouldn't be any problem with this for a refurbishment.

On the other hand, for reasons I don't understand, the weight of the barbette armor for the 2-gun installation is greater than the barbette armor for the original triple turret. That's with it staying in the same location, with the armor thickness remaining constant, with a smaller turret on top, and with less (100 shells/gun for 2 guns, not 3) shells inside.

I played around with changing 6x guns in 2x 3-gun mounts to 5x guns in 1x 3-gun and 1x 2-gun mount. If I changed only the mount types and not the number of guns, the armor weight went up. It only went down once I reduced the number of guns as well. I'm sure you were reducing the number of guns but without knowing exactly what you are starting with, that's the best I can do

Jefgte · January 16, 2025, 06:09:33 AM

QuoteI'm encountering an unexpected issue with my planned refurbishment of the Szermierz ACs...

Check all SS entries
Guns:
Mounts:
Location:
Armour:

--------
So why change T3 for T2 ?

The Rock Doctor · January 16, 2025, 07:04:26 AM

Quote from: Jeremy on January 15, 2025, 08:11:39 PM
Quote from: The Rock Doctor on January 15, 2025, 06:19:59 PMI'm encountering an unexpected issue with my planned refurbishment of the Szermierz ACs.

Like the Angstrom class battleships, I'm replacing the triple 350mm in the superfiring position with a 2-gun turret. Same gun, same shell size, same shell per gun count.

The weight of the 2-gun turret is less than the weight of the triple turret, so by the guidelines we have, there shouldn't be any problem with this for a refurbishment.

On the other hand, for reasons I don't understand, the weight of the barbette armor for the 2-gun installation is greater than the barbette armor for the original triple turret. That's with it staying in the same location, with the armor thickness remaining constant, with a smaller turret on top, and with less (100 shells/gun for 2 guns, not 3) shells inside.

I played around with changing 6x guns in 2x 3-gun mounts to 5x guns in 1x 3-gun and 1x 2-gun mount. If I changed only the mount types and not the number of guns, the armor weight went up. It only went down once I reduced the number of guns as well. I'm sure you were reducing the number of guns but without knowing exactly what you are starting with, that's the best I can do

I feel like I had it accounted for but clearly have some more work to do.

The Rock Doctor · January 16, 2025, 09:39:29 AM

Quote from: Jefgte on January 16, 2025, 06:09:33 AM
QuoteI'm encountering an unexpected issue with my planned refurbishment of the Szermierz ACs...

Check all SS entries
Guns:
Mounts:
Location:
Armour:

--------
So why change T3 for T2 ?

We talk about effective half-salvoes requiring four shells.

While I have nine guns and can theoretically alternate between four and five gun shots, one turret has to contribute fire to both sets of half-salvos. Since the guns are in a common sleeve, I assumed this would prevent the turret from reloading as quickly as the other turrets (which alternate shooting all three guns in every-other half salvo).

If the triple turret can reload at all angles, this is a moot issue. But I've been assuming the guns have to be lowered. That, to me, suggested that having a 2-gun mount, with independent loading, was advantageous for maintaining rate of fire. It does cost in overall firepower, of course.

The other consideration, really, is that the original design is 20 years old and I'm already thinking of it's replacement and maybe I shouldn't spend too much resources on this.

The Rock Doctor · January 16, 2025, 06:44:01 PM

Alright so I basically redid the sim from scratch and things seemed to make sense when it was done. So I must have introduced an error somewhere last night when I was working off the 1932 SS report.

I was intrigued to note that SS apparently takes the barbette armor right down to the waterline, so long as there is any freeboard. Obviously the higher the freeboard, the more barbette armor you have. But even if the freeboard is 0.1 metres on the foredeck, there'd be 163 tonnes for a 330mm barbette.

Anyway, this refurbishment takes off the triple "B" turret. Only. I leave the barbette in place and plop the 2-gun turret back in its place. That is precisely what the 2-gun turret was designed for when I designed it in advance of the Angstrom refurbishments so although the turret weight is lighter, it fits beautifully. As I'm not changing the barbette or its contents, I adjust the shell count per gun to 112 to bring it up to 896 shells versus the 900 carried before. I could be pedantic and set aside miscellaneous weight for the other four shells (2.4 tonnes) but why.

Nonetheless, Springsharp wants to recalculate the barbette to 100% fit the 2-gun turret, so it's set aside less weight for barbette armor than should be the case. I've allocated the difference between "theoretical weight of a 2-gun barbette" and "actual weight of the old triple barbette" as miscellaneous weight at freeboard level. I figure that's a decent compromise rather than trying to spread it across Above Deck, Freeboard, and Above Deck. This is not a new expense, I'm just simming its retention from the initial build, so no cost set aside for it.

And since there is some hull strength left over as a result of shipping one less 350mm gun overall, I added to my weight reserve at freeboard and above deck.

Cost:

New guns: $1.10/0.552 BP
New turret (Face/other above deck) armor: $0.12/0.123 BP
New miscellaneous weight: $0.18/0.177 BP
Refurbishment cost: $6.57
======
$7.97 and 0.852 BP. Will take a little under a year to do, so I'll split it in two turns.

Szermierz 1936 refurbishment after 1932 refit, laid down 1916

Displacement:
   32,844 t light; 34,456 t standard; 36,342 t normal; 37,850 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (738.19 ft / 738.19 ft) x 91.86 ft (Bulges 95.14 ft) x (30.18 / 31.25 ft)
   (225.00 m / 225.00 m) x 28.00 m (Bulges 29.00 m) x (9.20 / 9.52 m)

Armament:
8 - 13.78" / 350 mm 45.0 cal guns - 1,319.35lbs / 598.45kg shells, 112 per gun
     Breech loading guns in turret on barbette mounts, 1916 Model
     2 x Triple mounts on centreline ends, evenly spread
     1 x 2-gun mount on centreline, forward deck centre
      1 raised mount
16 - 5.12" / 130 mm 45.0 cal guns - 67.61lbs / 30.67kg shells, 250 per gun
     Breech loading guns in deck and hoist mounts, 1916 Model
     8 x Twin mounts on sides, forward deck aft
4 - 3.94" / 100 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 250 per gun
     Quick firing guns in deck mounts, 1916 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
16 - 1.97" / 50.0 mm 60.0 cal guns - 4.18lbs / 1.89kg shells, 1,500 per gun
     Anti-air guns in deck mounts, 1916 Model
     8 x Twin mounts on sides, evenly spread
      8 raised mounts
16 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 5,000 per gun
     Machine guns in deck mounts, 1916 Model
     8 x Twin mounts on sides, evenly spread
      8 raised mounts
Weight of broadside 11,828 lbs / 5,365 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.0" / 330 mm   479.82 ft / 146.25 m   15.75 ft / 4.80 m
   Ends:   1.97" / 50 mm   258.33 ft / 78.74 m   11.81 ft / 3.60 m
     Main Belt covers 100 % of normal length

- Torpedo Bulkhead - Additional damage containing bulkheads:
      3.15" / 80 mm   479.82 ft / 146.25 m   28.48 ft / 8.68 m
   Beam between torpedo bulkheads 75.46 ft / 23.00 m

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   15.7" / 400 mm   5.91" / 150 mm      13.0" / 330 mm
   2nd:   1.97" / 50 mm   0.98" / 25 mm      3.94" / 100 mm
   3rd:   0.79" / 20 mm   0.39" / 10 mm        -
   4th:   0.59" / 15 mm   0.12" / 3 mm        -
   5th:   0.59" / 15 mm     -           -

- Armoured deck - multiple decks:
   For and Aft decks: 3.54" / 90 mm
   Forecastle: 2.95" / 75 mm Quarter deck: 3.54" / 90 mm

- Conning towers: Forward 12.99" / 330 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 134,049 shp / 100,000 Kw = 29.51 kts
   Range 12,000nm at 10.00 kts
   Bunker at max displacement = 3,394 tons

Complement:
   1,315 - 1,710

Cost:
   £4.824 million / $19.295 million

Distribution of weights at normal displacement:
   Armament: 2,210 tons, 6.1 %
     - Guns: 2,210 tons, 6.1 %
   Armour: 12,080 tons, 33.2 %
     - Belts: 4,379 tons, 12.0 %
     - Torpedo bulkhead: 1,592 tons, 4.4 %
     - Armament: 2,572 tons, 7.1 %
     - Armour Deck: 3,229 tons, 8.9 %
     - Conning Tower: 307 tons, 0.8 %
   Machinery: 4,994 tons, 13.7 %
   Hull, fittings & equipment: 12,427 tons, 34.2 %
   Fuel, ammunition & stores: 3,497 tons, 9.6 %
   Miscellaneous weights: 1,133 tons, 3.1 %
     - Hull below water: 165 tons
     - Hull above water: 164 tons
     - On freeboard deck: 284 tons
     - Above deck: 520 tons

Fittings:
-329 t: Extra damage control gear (BW/AW)
-30 t: Armed scoutplane and catapult (FD)
-154 t: "B" turret barbette weight adjustment (FD) (new to sim, but legacy weight so no cost)
-100 t: Flag facilities (AD)
-25 t: L/R wireless (AD)
-25 t: Huelsmeyer Device (AD)
-25 t: Nightfighting doodads (AD)
-232 t: 1930 Fire control (AD)
-100 t + 113 t: Weight reserve (FD/AD) (Note: 77 + 100 is new)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     50,766 lbs / 23,027 Kg = 38.8 x 13.8 " / 350 mm shells or 7.7 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 5.5 ft / 1.7 m
   Roll period: 17.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 61 %
         - Recoil effect (Restricted arc if above 1.00): 0.65
   Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.604
   Length to Beam Ratio: 7.76 : 1
   'Natural speed' for length: 27.17 kts
   Power going to wave formation at top speed: 53 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   20.00 %, 30.18 ft / 9.20 m, 24.28 ft / 7.40 m
     - Forward deck:   30.00 %, 24.28 ft / 7.40 m, 24.28 ft / 7.40 m
     - Aft deck:   35.00 %, 24.28 ft / 7.40 m, 24.28 ft / 7.40 m
     - Quarter deck:   15.00 %, 24.28 ft / 7.40 m, 24.28 ft / 7.40 m
     - Average freeboard:      24.75 ft / 7.54 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 90.2 %
      - Above water (accommodation/working, high = better): 174.4 %
   Waterplane Area: 49,597 Square feet or 4,608 Square metres
   Displacement factor (Displacement / loading): 108 %
   Structure weight / hull surface area: 180 lbs/sq ft or 877 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.39
      - Overall: 1.01
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Good seaboat, rides out heavy weather easily

The Rock Doctor · January 18, 2025, 08:36:06 PM

A river gunboat primarily about carrying a 150mm howitzer up rivers. Armor is on par with the 1933 river gunboat.

Oaky, the machine guns don't quite match the drawing - should be a twin aft and two singles on the sides. Whatever.

Enter ship name, Enter country Enter ship type laid down 1936

Displacement:
268 t light; 290 t standard; 295 t normal; 299 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(151.46 ft / 147.64 ft) x 32.81 ft x (3.28 / 3.32 ft)
(46.16 m / 45.00 m) x 10.00 m x (1.00 / 1.01 m)

Armament:
1 - 5.91" / 150 mm 25.0 cal gun - 93.53lbs / 42.43kg shells, 150 per gun
Breech loading gun in deck and hoist mount, 1936 Model
1 x Single mount on centreline, forward deck centre
2 - 1.97" / 50.0 mm 60.0 cal guns - 4.18lbs / 1.89kg shells, 1,500 per gun
Anti-air guns in deck mount, 1936 Model
1 x Twin mount on centreline, aft deck forward
1 raised mount
4 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 5,000 per gun
Machine guns in deck mounts, 1936 Model
2 x Twin mounts on sides, aft deck centre
Weight of broadside 102 lbs / 46 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0.79" / 20 mm 95.96 ft / 29.25 m 4.92 ft / 1.50 m
Ends: Unarmoured
Upper: 0.79" / 20 mm 39.37 ft / 12.00 m 2.95 ft / 0.90 m
Main Belt covers 100 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm 0.59" / 15 mm 0.98" / 25 mm
2nd: 0.59" / 15 mm - -
3rd: 0.59" / 15 mm - -

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

- Conning towers: Forward 0.79" / 20 mm, Aft 0.00" / 0 mm

Machinery:
Diesel Internal combustion motors,
Electric cruising motors plus geared drives, 2 shafts, 469 shp / 350 Kw = 12.18 kts
Range 500nm at 10.00 kts
Bunker at max displacement = 9 tons

Complement:
35 - 46

Cost:
£0.089 million / $0.358 million

Distribution of weights at normal displacement:
Armament: 16 tons, 5.5 %
- Guns: 16 tons, 5.5 %
Armour: 85 tons, 29.0 %
- Belts: 23 tons, 7.9 %
- Armament: 7 tons, 2.3 %
- Armour Deck: 54 tons, 18.5 %
- Conning Tower: 1 tons, 0.3 %
Machinery: 13 tons, 4.5 %
Hull, fittings & equipment: 120 tons, 40.7 %
Fuel, ammunition & stores: 27 tons, 9.2 %
Miscellaneous weights: 33 tons, 11.2 %
- Hull below water: 7 tons
- On freeboard deck: 2 tons
- Above deck: 24 tons

Fittings:
-7 t: D-E machinery BW
-2 t: Weight reserve FD
-2 t: Lights AD
-10 t: Second short-range wireless AD
-2 t: Fire control, such as it is AD
-10 t: Reinforced spotting top AD

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
984 lbs / 446 Kg = 9.6 x 5.9 " / 150 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.42
Metacentric height 1.7 ft / 0.5 m
Roll period: 10.5 seconds
Steadiness - As gun platform (Average = 50 %): 90 %
- Recoil effect (Restricted arc if above 1.00): 0.14
Seaboat quality (Average = 1.00): 1.08

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.650 / 0.651
Length to Beam Ratio: 4.50 : 1
'Natural speed' for length: 12.15 kts
Power going to wave formation at top speed: 46 %
Trim (Max stability = 0, Max steadiness = 100): 83
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 1.97 ft / 0.60 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 10.50 ft / 3.20 m, 5.58 ft / 1.70 m
- Forward deck: 20.00 %, 5.58 ft / 1.70 m, 5.58 ft / 1.70 m
- Aft deck: 45.00 %, 5.58 ft / 1.70 m, 5.58 ft / 1.70 m
- Quarter deck: 15.00 %, 5.58 ft / 1.70 m, 5.58 ft / 1.70 m
- Average freeboard: 5.97 ft / 1.82 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 40.4 %
- Above water (accommodation/working, high = better): 112.6 %
Waterplane Area: 3,711 Square feet or 345 Square metres
Displacement factor (Displacement / loading): 148 %
Structure weight / hull surface area: 31 lbs/sq ft or 150 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.70
- Longitudinal: 1.42
- Overall: 0.75
Caution: Hull subject to strain in open-sea
Excellent machinery, storage, compartmentation space
Adequate accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform

The Rock Doctor · January 19, 2025, 06:18:09 PM

A bigger gunboat with a 250mm howitzer onboard. Probably overkill, but then again maybe not. Same general appearance as the smaller guy above, with the 75mm superfiring over the howitzer.

The draft is, by necessity deeper than the smaller boat so it wouldn't have as much ability to navigate far up-rivers, but it would manage the Rio Plata watershed for a long ways and could be handy within the Trans-Eryka Canal if shit really hits the fan. It would not be able to navigate much of the Niger.

D-E machinery below deck, weight reserve on freeboard, fire control/lights/additional radio and a modest spotting top above deck.

Enter ship name, Enter country Enter ship type laid down 1936

Displacement:
   689 t light; 747 t standard; 763 t normal; 775 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (192.62 ft / 187.01 ft) x 39.37 ft x (5.58 / 5.65 ft)
   (58.71 m / 57.00 m) x 12.00 m x (1.70 / 1.72 m)

Armament:
1 - 9.84" / 250 mm 35.0 cal gun - 447.02lbs / 202.77kg shells, 100 per gun
     Breech loading gun in deck and hoist mount, 1936 Model
     1 x Single mount on centreline, forward deck centre
1 - 2.95" / 75.0 mm 45.0 cal gun - 12.98lbs / 5.89kg shells, 400 per gun
     Dual purpose gun in deck mount, 1936 Model
     1 x Single mount on centreline, aft deck forward
      1 raised mount
4 - 1.97" / 50.0 mm 60.0 cal guns - 4.18lbs / 1.89kg shells, 1,500 per gun
     Anti-air guns in deck mounts, 1936 Model
     2 x Twin mounts on sides, aft deck centre
4 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 5,000 per gun
     Machine guns in deck mounts, 1936 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
Weight of broadside 477 lbs / 216 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   0.98" / 25 mm   121.56 ft / 37.05 m   7.87 ft / 2.40 m
   Ends:   0.59" / 15 mm     65.42 ft / 19.94 m   5.91 ft / 1.80 m
     Main Belt covers 100 % of normal length

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.98" / 25 mm      0.98" / 25 mm
   2nd:   0.59" / 15 mm   0.12" / 3 mm        -
   3rd:   0.59" / 15 mm     -           -
   4th:   0.59" / 15 mm     -           -

- Armoured deck - single deck:
   For and Aft decks: 0.98" / 25 mm
   Forecastle: 0.98" / 25 mm Quarter deck: 0.98" / 25 mm

- Conning towers: Forward 0.98" / 25 mm, Aft 0.00" / 0 mm

Machinery:
   Diesel Internal combustion generators, plus diesel motors,
   Electric motors, 2 shafts, 737 shp / 550 Kw = 12.19 kts
   Range 1,000nm at 10.00 kts
   Bunker at max displacement = 28 tons

Complement:
   72 - 94

Cost:
   £0.325 million / $1.300 million

Distribution of weights at normal displacement:
   Armament: 97 tons, 12.7 %
     - Guns: 97 tons, 12.7 %
   Armour: 175 tons, 22.9 %
     - Belts: 52 tons, 6.8 %
     - Armament: 17 tons, 2.3 %
     - Armour Deck: 104 tons, 13.6 %
     - Conning Tower: 2 tons, 0.2 %
   Machinery: 21 tons, 2.7 %
   Hull, fittings & equipment: 320 tons, 41.9 %
   Fuel, ammunition & stores: 74 tons, 9.6 %
   Miscellaneous weights: 77 tons, 10.1 %
     - Hull below water: 13 tons
     - On freeboard deck: 14 tons
     - Above deck: 50 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,851 lbs / 839 Kg = 3.9 x 9.8 " / 250 mm shells or 1.3 torpedoes
   Stability (Unstable if below 1.00): 1.31
   Metacentric height 2.0 ft / 0.6 m
   Roll period: 11.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.61
   Seaboat quality (Average = 1.00): 1.68

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.650 / 0.652
   Length to Beam Ratio: 4.75 : 1
   'Natural speed' for length: 13.68 kts
   Power going to wave formation at top speed: 43 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 2.95 ft / 0.90 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
     - Forecastle:   20.00 %, 15.09 ft / 4.60 m, 10.17 ft / 3.10 m
     - Forward deck:   30.00 %, 10.17 ft / 3.10 m, 10.17 ft / 3.10 m
     - Aft deck:   35.00 %, 10.17 ft / 3.10 m, 10.17 ft / 3.10 m
     - Quarter deck:   15.00 %, 10.17 ft / 3.10 m, 10.17 ft / 3.10 m
     - Average freeboard:      10.56 ft / 3.22 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 55.4 %
      - Above water (accommodation/working, high = better): 151.8 %
   Waterplane Area: 5,640 Square feet or 524 Square metres
   Displacement factor (Displacement / loading): 122 %
   Structure weight / hull surface area: 52 lbs/sq ft or 254 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.64
      - Longitudinal: 2.84
      - Overall: 0.75
   Caution: Hull subject to strain in open-sea
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

TacCovert4 · January 19, 2025, 07:07:49 PM

I'm all about big guns. But I think that 150mm is already giving you a river monitor that's wielding more firepower than most corps artillery batteries. 250mm would be a siege weapon but I think you're better off with a 100 to 150mm gun and a lot more ammo.