If your DDs are thought to destroy older pre-WWI DDs of the area I don´t think you need a 150mm gun, any hit from a gun, even a ligth one, is going to make a lot of damage to a ship like these, so why not lots of smaller guns?. And she´s a good seaboat.
DDL, Chilean Destroyer laid down 1925
Displacement:
826 t light; 850 t standard; 890 t normal; 919 t full load
Dimensions: Length overall / water x beam x draught
232,30 ft / 228,00 ft x 23,00 ft x 14,25 ft (normal load)
70,81 m / 69,49 m x 7,01 m x 4,34 m
Armament:
4 - 3,00" / 76,2 mm guns (2x2 guns), 13,50lbs / 6,12kg shells, 1925 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
2 - 3,00" / 76,2 mm guns in single mounts, 13,50lbs / 6,12kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, all raised mounts
2 - 1,46" / 37,0 mm guns in single mounts, 1,55lbs / 0,70kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, all aft
2 - 0,50" / 12,7 mm guns in single mounts, 0,06lbs / 0,03kg shells, 1925 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 84 lbs / 38 kg
Shells per gun, main battery: 100
4 - 21,0" / 533,4 mm above water torpedoes
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 30.062 shp / 22.426 Kw = 32,00 kts
Range 2.900nm at 10,00 kts (Bunkerage = 73 tons)
Complement:
80 - 105
Cost:
£0,349 million / $1,397 million
Distribution of weights at normal displacement:
Armament: 11 tons, 1,2 %
Machinery: 492 tons, 55,3 %
Hull, fittings & equipment: 313 tons, 35,2 %
Fuel, ammunition & stores: 64 tons, 7,2 %
Miscellaneous weights: 10 tons, 1,1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
187 lbs / 85 Kg = 13,9 x 3,0 " / 76 mm shells or 0,2 torpedoes
Stability (Unstable if below 1.00): 1,01
Metacentric height 0,6 ft / 0,2 m
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0,31
Seaboat quality (Average = 1.00): 1,20
Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0,417
Length to Beam Ratio: 9,91 : 1
'Natural speed' for length: 15,10 kts
Power going to wave formation at top speed: 75 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 10,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24,40 ft / 7,44 m
- Forecastle (35 %): 20,00 ft / 6,10 m (12,00 ft / 3,66 m aft of break)
- Mid (50 %): 12,00 ft / 3,66 m
- Quarterdeck (15 %): 12,00 ft / 3,66 m
- Stern: 12,00 ft / 3,66 m
- Average freeboard: 15,42 ft / 4,70 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 188,5 %
- Above water (accommodation/working, high = better): 41,9 %
Waterplane Area: 3.092 Square feet or 287 Square metres
Displacement factor (Displacement / loading): 44 %
Structure weight / hull surface area: 28 lbs/sq ft or 137 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,50
- Longitudinal: 11,75
- Overall: 0,68
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is extremely poor
Good seaboat, rides out heavy weather easily