Laksmanavati designs

The Rock Doctor · December 03, 2023, 06:13:53 PM

The 1924 battleship moves to an all-or-nothing armor scheme, the weight savings of which allow the middle turret to be scaled up to a 3-gunner and moved to X as a superfiring mount.

1924 battleship, laid down 1924, name checks out.

Displacement:
   21,477 t light; 22,830 t standard; 23,989 t normal; 24,917 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (539.29 ft / 524.93 ft) x 91.86 ft x (28.54 / 29.46 ft)
   (164.38 m / 160.00 m) x 28.00 m x (8.70 / 8.98 m)

Armament:
9 - 14.17" / 360 mm 45.0 cal guns - 1,435.70lbs / 651.22kg shells, 90 per gun
     Breech loading guns in turret on barbette mounts, 1924 Model
     2 x 3-gun mounts on centreline ends, evenly spread
     1 x 3-gun mount on centreline, aft deck centre
      1 raised mount
12 - 6.30" / 160 mm 45.0 cal guns - 126.04lbs / 57.17kg shells, 250 per gun
     Breech loading guns in deck and hoist mounts, 1924 Model
     6 x 2-gun mounts on sides, forward deck aft
10 - 2.36" / 60.0 mm 45.0 cal guns - 6.65lbs / 3.01kg shells, 400 per gun
     Anti-air guns in deck mounts, 1924 Model
     8 x Single mounts on sides amidships
      8 raised mounts
     2 x Single mounts on sides, forward deck centre
      2 raised mounts
16 - 0.47" / 12.0 mm 90.0 cal guns - 0.06lbs / 0.03kg shells, 4,000 per gun
     Machine guns in deck mounts, 1924 Model
     8 x Twin mounts on sides, evenly spread
      8 raised mounts
Weight of broadside 14,501 lbs / 6,578 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   14.2" / 360 mm   341.21 ft / 104.00 m   15.75 ft / 4.80 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

- Torpedo Bulkhead:
      1.18" / 30 mm   341.21 ft / 104.00 m   24.74 ft / 7.54 m

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   14.2" / 360 mm   5.91" / 150 mm      14.2" / 360 mm
   2nd:   1.97" / 50 mm   0.98" / 25 mm      0.98" / 25 mm
   3rd:   0.79" / 20 mm   0.59" / 15 mm        -
   4th:   0.59" / 15 mm     -           -

- Armoured deck - single deck: 4.33" / 110 mm For and Aft decks
   Forecastle: 2.36" / 60 mm Quarter deck: 4.33" / 110 mm

- Conning towers: Forward 2.36" / 60 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 32,172 shp / 24,000 Kw = 21.04 kts
   Range 12,000nm at 10.00 kts
   Bunker at max displacement = 2,087 tons

Complement:
   963 - 1,252

Cost:
   £6.960 million / $27.840 million

Distribution of weights at normal displacement:
   Armament: 3,090 tons, 12.9 %
   Armour: 8,745 tons, 36.5 %
     - Belts: 3,394 tons, 14.1 %
     - Torpedo bulkhead: 369 tons, 1.5 %
     - Armament: 2,180 tons, 9.1 %
     - Armour Deck: 2,760 tons, 11.5 %
     - Conning Tower: 42 tons, 0.2 %
   Machinery: 1,060 tons, 4.4 %
   Hull, fittings & equipment: 7,945 tons, 33.1 %
   Fuel, ammunition & stores: 2,512 tons, 10.5 %
   Miscellaneous weights: 637 tons, 2.7 %
     - On freeboard deck: 137 tons
     - Above deck: 500 tons

Fittings:
-310 t: 1918 fire control (AD)
-25 t: L/R wireless (AD)
-25 t: Nightfighting doodads (AD)
-100 t: Command facilities (AD)
-55 t: 2 scoutplanes and catapult (FD)
-40 + 82 t: Weight reserve (AD/FD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     33,039 lbs / 14,986 Kg = 23.2 x 14.2 " / 360 mm shells or 5.7 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 5.6 ft / 1.7 m
   Roll period: 16.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 61 %
         - Recoil effect (Restricted arc if above 1.00): 0.75
   Seaboat quality (Average = 1.00): 1.29

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.610 / 0.614
   Length to Beam Ratio: 5.71 : 1
   'Natural speed' for length: 22.91 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   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 %, 25.92 ft / 7.90 m, 21.00 ft / 6.40 m
     - Forward deck:   30.00 %, 21.00 ft / 6.40 m, 21.00 ft / 6.40 m
     - Aft deck:   35.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
     - Quarter deck:   15.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
     - Average freeboard:      17.45 ft / 5.32 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 84.1 %
      - Above water (accommodation/working, high = better): 118.0 %
   Waterplane Area: 35,600 Square feet or 3,307 Square metres
   Displacement factor (Displacement / loading): 98 %
   Structure weight / hull surface area: 194 lbs/sq ft or 947 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.90
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is adequate
   Good seaboat, rides out heavy weather easily

The Rock Doctor · December 03, 2023, 06:28:41 PM

Class of 1928

This class is smaller on account of only having three years production factored in.

-Type E MTB (20 t): 29 units
-Type F MTB (40 t): 10 units
-Type 1910 submarine (500 t): 5 units
-Type 1915 minelaying submarine (500 t): 3 units
-Minesweeper/sloop (251 t): 5 units
-1,500 t destroyer: 6 units
-5,615 t light cruiser: 2 units
-19,495 t armored cruiser: 2 units

Note: Added 2 MTB-E and 1 sloop in exchange for slightly lighter ACs.

The Rock Doctor · December 03, 2023, 06:31:33 PM

The 1928 coastal sweeper/sloop has an enhanced hydrophone package, which means a bit less capability elsewhere.

1928 coastal sweeper, laid down 1928

Displacement:
   251 t light; 263 t standard; 284 t normal; 301 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (121.89 ft / 114.83 ft) x 21.98 ft x (7.87 / 8.22 ft)
   (37.15 m / 35.00 m) x 6.70 m x (2.40 / 2.51 m)

Armament:
1 - 4.33" / 110 mm 45.0 cal gun - 40.96lbs / 18.58kg shells, 200 per gun
     Quick firing gun in deck mount, 1928 Model
     1 x Single mount on centreline, forward deck forward
1 - 2.36" / 60.0 mm 45.0 cal gun - 6.65lbs / 3.01kg shells, 250 per gun
     Anti-air gun in deck mount, 1928 Model
     1 x Single mount on centreline, aft deck centre
      1 raised mount
4 - 0.47" / 12.0 mm 90.0 cal guns - 0.06lbs / 0.03kg shells, 4,000 per gun
     Machine guns in deck mounts, 1928 Model
     4 x Single mounts on sides amidships
      4 raised mounts
Weight of broadside 48 lbs / 22 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm     -           -
   2nd:   0.79" / 20 mm     -           -
   3rd:   0.79" / 20 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 1,273 shp / 950 Kw = 16.01 kts
   Range 3,000nm at 10.00 kts
   Bunker at max displacement = 38 tons

Complement:
   33 - 44

Cost:
   £0.064 million / $0.257 million

Distribution of weights at normal displacement:
   Armament: 9 tons, 3.2 %
   Armour: 9 tons, 3.1 %
     - Armament: 9 tons, 3.1 %
   Machinery: 40 tons, 14.0 %
   Hull, fittings & equipment: 106 tons, 37.3 %
   Fuel, ammunition & stores: 33 tons, 11.5 %
   Miscellaneous weights: 88 tons, 31.0 %
     - Hull below water: 15 tons
     - On freeboard deck: 63 tons
     - Above deck: 10 tons

Fittings:
-15 t: Enhanced hydrophone package (BW)
-25 t: Sweeping gear (FD)
-25 t: Mines or deck cargo (FD)
-10 t: ASW munitions (FD)
-1 t: 1918 fire control (AD)
-1 t: Spotlight (AD)
-3 + 8 t: Weight reserve (FD/AD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     701 lbs / 318 Kg = 17.3 x 4.3 " / 110 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.15
   Metacentric height 0.7 ft / 0.2 m
   Roll period: 11.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.32
   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): 0.500 / 0.507
   Length to Beam Ratio: 5.22 : 1
   'Natural speed' for length: 10.72 kts
   Power going to wave formation at top speed: 69 %
   Trim (Max stability = 0, Max steadiness = 100): 25
   Bow angle (Positive = bow angles forward): 10.00 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 %, 17.72 ft / 5.40 m, 15.75 ft / 4.80 m
     - Forward deck:   40.00 %, 15.75 ft / 4.80 m, 15.75 ft / 4.80 m
     - Aft deck:   25.00 %, 7.87 ft / 2.40 m, 7.87 ft / 2.40 m
     - Quarter deck:   15.00 %, 7.87 ft / 2.40 m, 7.87 ft / 2.40 m
     - Average freeboard:      12.76 ft / 3.89 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 61.6 %
      - Above water (accommodation/working, high = better): 123.5 %
   Waterplane Area: 1,682 Square feet or 156 Square metres
   Displacement factor (Displacement / loading): 142 %
   Structure weight / hull surface area: 26 lbs/sq ft or 128 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.63
      - Longitudinal: 22.39
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

The Rock Doctor · December 03, 2023, 06:37:02 PM

The 1928 CL takes the hull of the 1924 type but takes advantage of lighter machinery to add further aviation capabilities amidships.

1928 light cruiser, laid down 1928

Displacement:
   5,615 t light; 5,893 t standard; 6,402 t normal; 6,809 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (506.48 ft / 492.13 ft) x 49.21 ft x (19.69 / 20.59 ft)
   (154.38 m / 150.00 m) x 15.00 m x (6.00 / 6.28 m)

Armament:
8 - 6.30" / 160 mm 45.0 cal guns - 126.04lbs / 57.17kg shells, 250 per gun
     Breech loading guns in deck and hoist mounts, 1928 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
6 - 2.36" / 60.0 mm 45.0 cal guns - 6.65lbs / 3.01kg shells, 400 per gun
     Anti-air guns in deck mounts, 1928 Model
     6 x Single mounts on sides, evenly spread
      6 raised mounts
8 - 0.47" / 12.0 mm 90.0 cal guns - 0.06lbs / 0.03kg shells, 4,000 per gun
     Machine guns in deck mounts, 1928 Model
     4 x Twin mounts on sides, evenly spread
      4 raised mounts
Weight of broadside 1,049 lbs / 476 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.35" / 85 mm   377.30 ft / 115.00 m   11.81 ft / 3.60 m
   Ends:   Unarmoured
     Main Belt covers 118 % of normal length

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   2nd:   2.36" / 60 mm   0.98" / 25 mm      2.36" / 60 mm
   3rd:   0.79" / 20 mm   0.59" / 15 mm        -
   4th:   0.59" / 15 mm     -           -

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

- Conning towers: Forward 3.35" / 85 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 60,321 shp / 45,000 Kw = 31.03 kts
   Range 12,000nm at 10.00 kts
   Bunker at max displacement = 916 tons

Complement:
   357 - 465

Cost:
   £2.127 million / $8.507 million

Distribution of weights at normal displacement:
   Armament: 276 tons, 4.3 %
   Armour: 1,094 tons, 17.1 %
     - Belts: 595 tons, 9.3 %
     - Armament: 70 tons, 1.1 %
     - Armour Deck: 404 tons, 6.3 %
     - Conning Tower: 25 tons, 0.4 %
   Machinery: 1,878 tons, 29.3 %
   Hull, fittings & equipment: 2,071 tons, 32.3 %
   Fuel, ammunition & stores: 787 tons, 12.3 %
   Miscellaneous weights: 297 tons, 4.6 %
     - On freeboard deck: 147 tons
     - Above deck: 150 tons

Fittings:
-28 t: 1918 FC (AD)
-25 t: L/R wireless (AD)
-10 t: Night-fighting doodads (AD)
-50 t: Command facilities (AD)
-32 t: 4x2 21" heavyweight torpedo carriages, no reloads (FD)
-105 t: 2 Armed scoutplanes, 2 float fighters and a catapult (FD)
-17 + 10 t: Weight reserve (AD/FD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5,472 lbs / 2,482 Kg = 50.7 x 6 " / 152 mm shells or 1.0 torpedoes
   Stability (Unstable if below 1.00): 1.07
   Metacentric height 2.0 ft / 0.6 m
   Roll period: 14.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.63
   Seaboat quality (Average = 1.00): 1.17

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.470 / 0.478
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 22.18 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 51
   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 %, 25.92 ft / 7.90 m, 21.00 ft / 6.40 m
     - Forward deck:   40.00 %, 21.00 ft / 6.40 m, 21.00 ft / 6.40 m
     - Aft deck:   25.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
     - Quarter deck:   15.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
     - Average freeboard:      18.24 ft / 5.56 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 110.6 %
      - Above water (accommodation/working, high = better): 150.6 %
   Waterplane Area: 15,711 Square feet or 1,460 Square metres
   Displacement factor (Displacement / loading): 105 %
   Structure weight / hull surface area: 79 lbs/sq ft or 384 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.83
      - Longitudinal: 1.82
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

The Rock Doctor · December 03, 2023, 06:42:39 PM

The navy had neglected its heavy cruiser arm for too long in favor of a modest battleline; this class seeks to produce something that can challenge Siamese/Deccan/Sultanate units and be a significant nuisance to larger navies.

1928 armored cruiser, laid down 1928

Displacement:
   19,649 t light; 20,607 t standard; 22,076 t normal; 23,250 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (600.39 ft / 590.55 ft) x 85.30 ft x (27.89 / 29.06 ft)
   (183.00 m / 180.00 m) x 26.00 m x (8.50 / 8.86 m)

Armament:
8 - 10.24" / 260 mm 45.0 cal guns - 540.85lbs / 245.32kg shells, 100 per gun
     Breech loading guns in turret on barbette mounts, 1928 Model
     2 x 2-gun mounts on centreline, forward evenly spread
      1 raised mount
     2 x 2-gun mounts on centreline, aft evenly spread
      1 raised mount
12 - 6.50" / 165 mm 45.0 cal guns - 138.23lbs / 62.70kg shells, 250 per gun
     Breech loading guns in deck and hoist mounts, 1928 Model
     6 x 2-gun mounts on sides, evenly spread
8 - 2.36" / 60.0 mm 45.0 cal guns - 6.65lbs / 3.01kg shells, 1,500 per gun
     Anti-air guns in deck mounts, 1928 Model
     8 x Single mounts on sides, evenly spread
      8 raised mounts
12 - 0.47" / 12.0 mm 90.0 cal guns - 0.06lbs / 0.03kg shells, 4,000 per gun
     Machine guns in deck mounts, 1928 Model
     6 x Twin mounts on sides, evenly spread
      6 raised mounts
Weight of broadside 6,039 lbs / 2,739 kg

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   10.2" / 260 mm   383.86 ft / 117.00 m   11.81 ft / 3.60 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

- Torpedo Bulkhead:
      1.38" / 35 mm   383.86 ft / 117.00 m   25.46 ft / 7.76 m

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.2" / 310 mm   8.27" / 210 mm      10.2" / 260 mm
   2nd:   2.36" / 60 mm   1.38" / 35 mm      1.38" / 35 mm
   4th:   0.79" / 20 mm     -           -
   5th:   0.59" / 15 mm     -           -

- Armoured deck - multiple decks: 4.33" / 110 mm For and Aft decks
   Forecastle: 3.35" / 85 mm Quarter deck: 4.33" / 110 mm

- Conning towers: Forward 2.36" / 60 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, steam turbines,
   Geared drive, 4 shafts, 101,877 shp / 76,000 Kw = 29.14 kts
   Range 12,000nm at 10.00 kts
   Bunker at max displacement = 2,643 tons (100% coal)

Complement:
   905 - 1,177

Cost:
   £6.644 million / $26.578 million

Distribution of weights at normal displacement:
   Armament: 1,437 tons, 6.5 %
   Armour: 7,051 tons, 31.9 %
     - Belts: 1,995 tons, 9.0 %
     - Torpedo bulkhead: 498 tons, 2.3 %
     - Armament: 1,736 tons, 7.9 %
     - Armour Deck: 2,782 tons, 12.6 %
     - Conning Tower: 40 tons, 0.2 %
   Machinery: 3,489 tons, 15.8 %
   Hull, fittings & equipment: 7,127 tons, 32.3 %
   Fuel, ammunition & stores: 2,426 tons, 11.0 %
   Miscellaneous weights: 545 tons, 2.5 %
     - On freeboard deck: 195 tons
     - Above deck: 350 tons

Fittings:
-144 t: 1918 fire control (AD)
-25 t: L/R wireless (AD)
-25 t: Nightfighting doodads (AD)
-100 t: Command facilities (AD)
-105 t: 2 armed scouts, 2 float-fighters, and a catapult amidships (FD)
-56 + 90 t: Weight reserve (AD/FD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     31,021 lbs / 14,071 Kg = 57.8 x 10.2 " / 260 mm shells or 4.7 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 4.7 ft / 1.4 m
   Roll period: 16.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.55
   Seaboat quality (Average = 1.00): 1.10

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.556
   Length to Beam Ratio: 6.92 : 1
   'Natural speed' for length: 24.30 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 54
   Bow angle (Positive = bow angles forward): 10.00 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 %, 27.89 ft / 8.50 m, 22.97 ft / 7.00 m
     - Forward deck:   30.00 %, 22.97 ft / 7.00 m, 22.97 ft / 7.00 m
     - Aft deck:   35.00 %, 22.97 ft / 7.00 m, 22.97 ft / 7.00 m
     - Quarter deck:   15.00 %, 22.97 ft / 7.00 m, 22.97 ft / 7.00 m
     - Average freeboard:      23.36 ft / 7.12 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 99.0 %
      - Above water (accommodation/working, high = better): 169.9 %
   Waterplane Area: 35,156 Square feet or 3,266 Square metres
   Displacement factor (Displacement / loading): 111 %
   Structure weight / hull surface area: 149 lbs/sq ft or 729 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.91
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

The Rock Doctor · December 03, 2023, 06:47:13 PM

Total count:

6 battleships
4 armored cruisers
20 light cruisers
45 destroyers
19 submarines
112 motor-torpedo boats

And patrol/mine/auxiliary types

*Updated MTB count, December 4

Comments? Questions?

The Rock Doctor · December 03, 2023, 08:14:46 PM

Naming suggestions:

BB: Rajakiya, Ksamatasali; Mahimanbita, Sahasi; Bhayanaka, Ksipta

AC: Bagha, Mangusa; Siyala, Sibheta

CL: Dhaka, Chittagong, Khulna, Saidpur; Kolkata, Dhanpur, Patna, Biratnagar; Aizawl, Imphal, Shillong, Thimphu; Gorakhpur, Varanasi, Ranchi, Jamshedpur; Sittwe, Sandoway, Bassein; Puri, Bhubaneshwar, Cuttack; Barisal, Kohima

Coastal BB: Ascaryajanaka, Saktisali

Kaiser Kirk · December 03, 2023, 11:11:51 PM

I am a bit surprised the later ships don't take advantage of the ability to have overweight shells.
for the 'battleship' range, it can be questionable because of the effects on MV at different tech levels,
but for the <280mm rounds it seems worthwhile.

The Rock Doctor · December 04, 2023, 07:23:42 AM

I considered it, but it added to cost and I felt I was already straining to balance firepower, speed and protection without giving up something to accommodate heavier shells.

Kaiser Kirk · December 04, 2023, 09:37:31 AM

Balance ?
Is that why I see no unarmored 50knot vessels equipped with a spar torpedo ?

The Rock Doctor · December 04, 2023, 09:59:02 AM

Shhhhh, Jef's not supposed to know about those.

Jefgte · December 04, 2023, 04:18:49 PM

& the final 1500t DD 1928 class similar to the 1924 class with the range increase from 10 000nm to 12 000nm to work with the 1928 class AC.

1500T, Laksamanavati DD1928 laid down 1928

Displacement:
   1 500 t light; 1 571 t standard; 1 806 t normal; 1 995 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (384,40 ft / 380,58 ft) x 32,81 ft x (12,66 / 13,52 ft)
   (117,16 m / 116,00 m) x 10,00 m x (3,86 / 4,12 m)

Armament:
5 - 4,33" / 110 mm 45,0 cal guns - 40,96lbs / 18,58kg shells, 250 per gun
     Quick firing guns in deck mounts, 1928 Model
     5 x Single mounts on centreline ends, majority aft
      2 raised mounts - superfiring
4 - 2,36" / 60,0 mm 45,0 cal guns - 6,65lbs / 3,01kg shells, 400 per gun
     Anti-air guns in deck mounts, 1928 Model
     4 x Single mounts on side ends, evenly spread
12 - 0,47" / 12,0 mm 45,0 cal guns - 0,05lbs / 0,02kg shells, 1 000 per gun
     Machine guns in deck mounts, 1928 Model
     6 x 2-gun mounts on side ends, majority forward
      6 raised mounts
Weight of broadside 232 lbs / 105 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,98" / 25 mm     -           -
   2nd:   0,39" / 10 mm     -           -
   3rd:   0,39" / 10 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 35 200 shp / 26 259 Kw = 32,50 kts
   Range 12 000nm at 10,00 kts
   Bunker at max displacement = 424 tons

Complement:
   138 - 180

Cost:
   £0,730 million / $2,921 million

Distribution of weights at normal displacement:
   Armament: 42 tons, 2,3 %
     - Guns: 42 tons, 2,3 %
   Armour: 17 tons, 1,0 %
     - Armament: 17 tons, 1,0 %
   Machinery: 909 tons, 50,3 %
   Hull, fittings & equipment: 430 tons, 23,8 %
   Fuel, ammunition & stores: 306 tons, 17,0 %
   Miscellaneous weights: 101 tons, 5,6 %
     - Hull above water: 8 tons
     - On freeboard deck: 64 tons
     - Above deck: 29 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     469 lbs / 213 Kg = 11,5 x 4,3 " / 110 mm shells or 0,3 torpedoes
   Stability (Unstable if below 1.00): 1,17
   Metacentric height 1,3 ft / 0,4 m
   Roll period: 12,3 seconds
   Steadiness   - As gun platform (Average = 50 %): 80 %
         - Recoil effect (Restricted arc if above 1.00): 0,28
   Seaboat quality (Average = 1.00): 1,16

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0,400 / 0,414
   Length to Beam Ratio: 11,60 : 1
   'Natural speed' for length: 19,51 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 10,00 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 %, 21,65 ft / 6,60 m, 18,04 ft / 5,50 m
     - Forward deck:   30,00 %, 18,04 ft / 5,50 m, 16,73 ft / 5,10 m
     - Aft deck:   35,00 %, 8,86 ft / 2,70 m, 8,86 ft / 2,70 m
     - Quarter deck:   15,00 %, 8,86 ft / 2,70 m, 9,51 ft / 2,90 m
     - Average freeboard:      13,59 ft / 4,14 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 170,4 %
      - Above water (accommodation/working, high = better): 135,7 %
   Waterplane Area: 7 686 Square feet or 714 Square metres
   Displacement factor (Displacement / loading): 75 %
   Structure weight / hull surface area: 30 lbs/sq ft or 149 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 1,29
      - Overall: 0,55
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

AD
25t for LR wireless
4t for 1918 fire control
OD
36t for 4x3TTx533
5t for Hydrophone
5t for 50 ASW depth charges
18t for minen or reserved
AW
8t for engines additionnal ventillation

Trial Speed:33kts
Bonus:0.5

Kaiser Kirk · December 04, 2023, 05:10:09 PM

Quote from: The Rock Doctor on December 03, 2023, 06:42:39 PM
The navy had neglected its heavy cruiser arm for too long in favor of a modest battleline; this class seeks to produce something that can challenge Siamese/Deccan/Sultanate units and be a significant nuisance to larger navies.

1928 armored cruiser, laid down 1928
Machinery:
   Coal fired boilers, steam turbines,
   Geared drive, 4 shafts, 101,877 shp / 76,000 Kw = 29.14 kts
   Range 12,000nm at 10.00 kts
   Bunker at max displacement = 2,643 tons (100% coal)

Seems to be the only coal fired vessel in this time period.
Intentional?

The Rock Doctor · December 04, 2023, 05:17:26 PM

Quote from: Kaiser Kirk on December 04, 2023, 05:10:09 PM
Quote from: The Rock Doctor on December 03, 2023, 06:42:39 PM
The navy had neglected its heavy cruiser arm for too long in favor of a modest battleline; this class seeks to produce something that can challenge Siamese/Deccan/Sultanate units and be a significant nuisance to larger navies.

1928 armored cruiser, laid down 1928
Machinery:
   Coal fired boilers, steam turbines,
   Geared drive, 4 shafts, 101,877 shp / 76,000 Kw = 29.14 kts
   Range 12,000nm at 10.00 kts
   Bunker at max displacement = 2,643 tons (100% coal)

Seems to be the only coal fired vessel in this time period.
Intentional?

Yikes. Absolutely accidental. I'll redo that.

The Rock Doctor · December 04, 2023, 05:18:50 PM

Quote from: Jefgte on December 04, 2023, 04:18:49 PM
& the final 1500t DD 1928 class similar to the 1924 class with the range increase from 10 000nm to 12 000nm to work with the 1928 class AC.

1500T, Laksamanavati DD1928 laid down 1928

Displacement:
   1 500 t light; 1 571 t standard; 1 806 t normal; 1 995 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (384,40 ft / 380,58 ft) x 32,81 ft x (12,66 / 13,52 ft)
   (117,16 m / 116,00 m) x 10,00 m x (3,86 / 4,12 m)

Armament:
5 - 4,33" / 110 mm 45,0 cal guns - 40,96lbs / 18,58kg shells, 250 per gun
     Quick firing guns in deck mounts, 1928 Model
     5 x Single mounts on centreline ends, majority aft
      2 raised mounts - superfiring
4 - 2,36" / 60,0 mm 45,0 cal guns - 6,65lbs / 3,01kg shells, 400 per gun
     Anti-air guns in deck mounts, 1928 Model
     4 x Single mounts on side ends, evenly spread
12 - 0,47" / 12,0 mm 45,0 cal guns - 0,05lbs / 0,02kg shells, 1 000 per gun
     Machine guns in deck mounts, 1928 Model
     6 x 2-gun mounts on side ends, majority forward
      6 raised mounts
Weight of broadside 232 lbs / 105 kg

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,98" / 25 mm     -           -
   2nd:   0,39" / 10 mm     -           -
   3rd:   0,39" / 10 mm     -           -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 35 200 shp / 26 259 Kw = 32,50 kts
   Range 12 000nm at 10,00 kts
   Bunker at max displacement = 424 tons

Complement:
   138 - 180

Cost:
   £0,730 million / $2,921 million

Distribution of weights at normal displacement:
   Armament: 42 tons, 2,3 %
     - Guns: 42 tons, 2,3 %
   Armour: 17 tons, 1,0 %
     - Armament: 17 tons, 1,0 %
   Machinery: 909 tons, 50,3 %
   Hull, fittings & equipment: 430 tons, 23,8 %
   Fuel, ammunition & stores: 306 tons, 17,0 %
   Miscellaneous weights: 101 tons, 5,6 %
     - Hull above water: 8 tons
     - On freeboard deck: 64 tons
     - Above deck: 29 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     469 lbs / 213 Kg = 11,5 x 4,3 " / 110 mm shells or 0,3 torpedoes
   Stability (Unstable if below 1.00): 1,17
   Metacentric height 1,3 ft / 0,4 m
   Roll period: 12,3 seconds
   Steadiness   - As gun platform (Average = 50 %): 80 %
         - Recoil effect (Restricted arc if above 1.00): 0,28
   Seaboat quality (Average = 1.00): 1,16

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0,400 / 0,414
   Length to Beam Ratio: 11,60 : 1
   'Natural speed' for length: 19,51 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 10,00 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 %, 21,65 ft / 6,60 m, 18,04 ft / 5,50 m
     - Forward deck:   30,00 %, 18,04 ft / 5,50 m, 16,73 ft / 5,10 m
     - Aft deck:   35,00 %, 8,86 ft / 2,70 m, 8,86 ft / 2,70 m
     - Quarter deck:   15,00 %, 8,86 ft / 2,70 m, 9,51 ft / 2,90 m
     - Average freeboard:      13,59 ft / 4,14 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 170,4 %
      - Above water (accommodation/working, high = better): 135,7 %
   Waterplane Area: 7 686 Square feet or 714 Square metres
   Displacement factor (Displacement / loading): 75 %
   Structure weight / hull surface area: 30 lbs/sq ft or 149 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 1,29
      - Overall: 0,55
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

AD
25t for LR wireless
4t for 1918 fire control
OD
36t for 4x3TTx533
5t for Hydrophone
5t for 50 ASW depth charges
18t for minen or reserved
AW
8t for engines additionnal ventillation

Trial Speed:33kts
Bonus:0.5

It looks good except that the 1928 ships can and should carry enhanced hydrophone packages rather than just the basic fit.