Here's two Light DD's I designed long ago for NavWeapons forum in response to a request for designs. The quintuple 24-inch TT's were requested as part of the design. Personally I think 150 rpg is low and needs to be increased...
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Suyukaze, IJN Light Destroyer laid down 1937 (Engine 1945)
Displacement:
1,389 t light; 1,432 t standard; 1,576 t normal; 1,692 t full load
Dimensions: Length overall / water x beam x draught
286.70 ft / 280.00 ft x 29.00 ft x 15.00 ft (normal load)
87.39 m / 85.34 m x 8.84 m x 4.57 m
Armament:
4 - 3.94" / 100 mm guns (2x2 guns), 30.58lbs / 13.87kg shells, 1937 Model
Dual purpose guns in turrets (on barbettes)
on centreline ends, evenly spread
18 - 0.98" / 25.0 mm guns (6x3 guns), 0.48lbs / 0.22kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 0.52" / 13.2 mm guns (2x2 guns), 0.07lbs / 0.03kg shells, 1937 Model
Machine guns in deck mounts
on centreline, all forward, all raised mounts - superfiring
Weight of broadside 131 lbs / 60 kg
Shells per gun, main battery: 150
4 - 24.0" / 609.6 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.50" / 38 mm 1.00" / 25 mm 1.50" / 38 mm
- Conning tower: 1.50" / 38 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 24,243 shp / 18,085 Kw = 30.00 kts
Range 4,000nm at 15.00 kts
Bunker at max displacement = 260 tons
Complement:
124 - 162
Cost:
£0.808 million / $3.231 million
Distribution of weights at normal displacement:
Armament: 16 tons, 1.0 %
Armour: 30 tons, 1.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 26 tons, 1.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 4 tons, 0.3 %
Machinery: 612 tons, 38.8 %
Hull, fittings & equipment: 650 tons, 41.2 %
Fuel, ammunition & stores: 188 tons, 11.9 %
Miscellaneous weights: 80 tons, 5.1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
982 lbs / 445 Kg = 32.1 x 3.9 " / 100 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 0.8 ft / 0.3 m
Roll period: 13.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.40
Seaboat quality (Average = 1.00): 1.01
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.453
Length to Beam Ratio: 9.66 : 1
'Natural speed' for length: 19.26 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.41 ft / 5.61 m
- Forecastle (20 %): 16.71 ft / 5.09 m
- Mid (50 %): 14.71 ft / 4.48 m
- Quarterdeck (15 %): 11.71 ft / 3.57 m
- Stern: 11.71 ft / 3.57 m
- Average freeboard: 14.57 ft / 4.44 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 139.3 %
- Above water (accommodation/working, high = better): 66.2 %
Waterplane Area: 5,394 Square feet or 501 Square metres
Displacement factor (Displacement / loading): 108 %
Structure weight / hull surface area: 51 lbs/sq ft or 249 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.82
- Longitudinal: 5.69
- Overall: 0.99
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
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Suyukaze II, IJN Light Destroyer laid down 1937 (Engine 1945)
Displacement:
1,371 t light; 1,410 t standard; 1,553 t normal; 1,668 t full load
Dimensions: Length overall / water x beam x draught
296.73 ft / 290.00 ft x 29.00 ft x 15.00 ft (normal load)
90.44 m / 88.39 m x 8.84 m x 4.57 m
Armament:
3 - 3.94" / 100 mm guns in single mounts, 30.58lbs / 13.87kg shells, 1937 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority aft, 1 raised mount aft
12 - 0.98" / 25.0 mm guns (4x3 guns), 0.48lbs / 0.22kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 0.51" / 13.0 mm guns (2x2 guns), 0.07lbs / 0.03kg shells, 1937 Model
Machine guns in deck mounts
on centreline, all forward, all raised mounts - superfiring
Weight of broadside 98 lbs / 44 kg
Shells per gun, main battery: 150
5 - 24.0" / 609.6 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.50" / 13 mm - -
- Conning tower: 1.50" / 38 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 23,202 shp / 17,309 Kw = 30.00 kts
Range 4,000nm at 15.00 kts
Bunker at max displacement = 258 tons
Complement:
123 - 160
Cost:
£0.765 million / $3.060 million
Distribution of weights at normal displacement:
Armament: 12 tons, 0.8 %
Armour: 8 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 4 tons, 0.3 %
Machinery: 586 tons, 37.7 %
Hull, fittings & equipment: 685 tons, 44.1 %
Fuel, ammunition & stores: 183 tons, 11.8 %
Miscellaneous weights: 80 tons, 5.1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,019 lbs / 462 Kg = 33.3 x 3.9 " / 100 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 0.8 ft / 0.3 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.30
Seaboat quality (Average = 1.00): 1.01
Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.431
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 19.61 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.50 ft / 5.64 m
- Forecastle (20 %): 16.50 ft / 5.03 m (10.50 ft / 3.20 m aft of break)
- Mid (50 %): 14.50 ft / 4.42 m
- Quarterdeck (15 %): 12.50 ft / 3.81 m
- Stern: 10.50 ft / 3.20 m
- Average freeboard: 13.66 ft / 4.16 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 133.9 %
- Above water (accommodation/working, high = better): 51.5 %
Waterplane Area: 5,488 Square feet or 510 Square metres
Displacement factor (Displacement / loading): 114 %
Structure weight / hull surface area: 55 lbs/sq ft or 270 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 5.09
- Overall: 1.12
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped