Laksmanavati designs

[Jeremy]

Right it's a armed trawler.
But 21kts is fast for a trawler.

Fair point. I'll have to recrunch the numbers to bring it down. Does 15 wound better? The design was based on the USN SC-1 class which is where the speed came from

Just reclassifying it as a requisitioned armed trawler does make more sense.

[Jefgte]

18kts for a "fast trawler".

[Jeremy]

Armed Trawler, Laksmanavati Trawler laid down 1922

Displacement:
   347 t light; 357 t standard; 374 t normal; 388 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (173.03 ft / 170.60 ft) x 23.62 ft x (5.91 / 6.08 ft)
   (52.74 m / 52.00 m) x 7.20 m  x (1.80 / 1.85 m)

Armament:
      2 - 1.57" / 40.0 mm 39.0 cal guns - 1.86lbs / 0.84kg shells, 900 per gun
     Anti-air guns in deck mount, 1922 Model
     1 x Twin mount on centreline, forward deck forward
      2 - 0.47" / 12.0 mm 90.0 cal guns - 0.06lbs / 0.03kg shells, 2,000 per gun
     Machine guns in deck mounts, 1922 Model
     2 x Single mounts on sides amidships
      Weight of broadside 4 lbs / 2 kg

Machinery:
   Diesel Internal combustion motors,  plus diesel motors,
   Geared drive, 1 shaft, 940 shp / 701 Kw = 15.00 kts
   Range 2,000nm at 10.00 kts
   Bunker at max displacement = 31 tons

Complement:
   42 - 55

Cost:
   £0.046 million / $0.184 million

Distribution of weights at normal displacement:
   Armament: 1 tons, 0.2 %
      - Guns: 1 tons, 0.2 %
   Machinery: 32 tons, 8.5 %
   Hull, fittings & equipment: 121 tons, 32.2 %
   Fuel, ammunition & stores: 27 tons, 7.1 %
   Miscellaneous weights: 194 tons, 51.9 %
      - Hull below water: 20 tons
      - Hull above water: 20 tons
      - On freeboard deck: 154 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,169 lbs / 530 Kg = 598.9 x 1.6 " / 40 mm shells or 1.2 torpedoes
   Stability (Unstable if below 1.00): 1.15
   Metacentric height 0.7 ft / 0.2 m
   Roll period: 11.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 52 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 1.43

Hull form characteristics:
   Hull has raised forecastle,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.554
   Length to Beam Ratio: 7.22 : 1
   'Natural speed' for length: 13.06 kts
   Power going to wave formation at top speed: 52 %
   Trim (Max stability = 0, Max steadiness = 100): 36
   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 %,  13.78 ft / 4.20 m,  10.83 ft / 3.30 m
      - Forward deck:   30.00 %,  8.20 ft / 2.50 m,  6.56 ft / 2.00 m
      - Aft deck:   35.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Quarter deck:   15.00 %,  6.56 ft / 2.00 m,  7.87 ft / 2.40 m
      - Average freeboard:      8.00 ft / 2.44 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 41.9 %
      - Above water (accommodation/working, high = better): 85.9 %
   Waterplane Area: 2,728 Square feet or 253 Square metres
   Displacement factor (Displacement / loading): 144 %
   Structure weight / hull surface area: 29 lbs/sq ft or 140 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.86
      - Overall: 1.03
   Excellent machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Good seaboat, rides out heavy weather easily

Fittings:
-10 t: Diesel engines (vital)
-5 t: Basic hydrophones (vital)
-2 t: 2x Thornycroft DC throwers (on deck)
-2 t: 20x 90 kg DC (on deck)
-5 + 20 + 150 t: Cargo space / Weight reserve (vital + hull + on deck)

Range: 3700 (geared bonus + diesel bonus)

[Jeremy]

Harbor Sentry, Laksmanavati Harbor Sentry laid down 1917

Built to mercantile standards. Purpose is to patrol harbors and coastal waters and provide limited air defense. Their limited ASW loadout is primarily to hold submarines down until heavier boats can arrive.

They should be built with diesel engines but the RLN doesn't have those for a few years yet. Maybe a new design will replace them?

Displacement:
   80 t light; 82 t standard; 87 t normal; 91 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (117.99 ft / 114.83 ft) x 16.40 ft x (2.95 / 3.06 ft)
   (35.96 m / 35.00 m) x 5.00 m  x (0.90 / 0.93 m)

Armament:
      1 - 1.57" / 40.0 mm 39.0 cal gun - 1.86lbs / 0.84kg shells, 800 per gun
     Anti-air gun in deck mount, 1920 Model
     1 x Single mount on centreline, forward deck forward
      2 - 0.47" / 12.0 mm 90.0 cal guns - 0.06lbs / 0.03kg shells, 2,000 per gun
     Machine guns in deck mounts, 1917 Model
     2 x Single mounts on sides amidships
      Weight of broadside 2 lbs / 1 kg

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 190 shp / 142 Kw = 12.00 kts
   Range 2,000nm at 8.00 kts
   Bunker at max displacement = 9 tons

Complement:
   13 - 18

Cost:
   £0.007 million / $0.029 million

Distribution of weights at normal displacement:
   Armament: 1 tons, 0.7 %
      - Guns: 1 tons, 0.7 %
   Machinery: 7 tons, 8.0 %
   Hull, fittings & equipment: 45 tons, 51.7 %
   Fuel, ammunition & stores: 8 tons, 8.8 %
   Miscellaneous weights: 27 tons, 30.9 %
      - Hull below water: 5 tons
      - Hull above water: 10 tons
      - On freeboard deck: 12 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     400 lbs / 181 Kg = 204.6 x 1.6 " / 40 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 0.4 ft / 0.1 m
   Roll period: 10.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.03
   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): 0.550 / 0.555
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 10.72 kts
   Power going to wave formation at top speed: 48 %
   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 %,  11.78 ft / 3.59 m,  9.65 ft / 2.94 m
      - Forward deck:   30.00 %,  9.65 ft / 2.94 m,  7.51 ft / 2.29 m
      - Aft deck:   35.00 %,  7.51 ft / 2.29 m,  7.51 ft / 2.29 m
      - Quarter deck:   15.00 %,  7.51 ft / 2.29 m,  7.51 ft / 2.29 m
      - Average freeboard:      8.43 ft / 2.57 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 48.6 %
      - Above water (accommodation/working, high = better): 149.5 %
   Waterplane Area: 1,275 Square feet or 118 Square metres
   Displacement factor (Displacement / loading): 205 %
   Structure weight / hull surface area: 17 lbs/sq ft or 85 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.75
      - Longitudinal: 8.53
      - Overall: 0.96
   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

Fittings:
-1 t: 1x spotlight (on deck)
-5 t: Basic hydrophones (vital)
-1 t: 10x 90kg DC (on deck)
-10 + 10 t: Weight reserve / cargo (hull + on deck)

[The Rock Doctor]

That's a handy little vessel, I like it.