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No-name, Chosen/Formosa Destroyer laid down 1925

Ships: 9. C-D-1 to C-D-9

Displacement:

1,593 t light; 1,652 t standard; 1,891 t normal; 2,082 t full load

Dimensions: Length overall / water x beam x draught

390.00 ft / 390.00 ft x 33.40 ft x 12.70 ft (normal load)

118.87 m / 118.87 m 10.18 m x 3.87 m

Armament:

4 - 4.13" / 105 mm guns in single mounts, 36.00lbs / 16.33kg shells, 1921 Model

Dual purpose guns in deck mounts with hoists

on centreline ends, evenly spread, 2 raised mounts - superfiring

8 - 1.57" / 40.0 mm guns (2x4 guns), 2.00lbs / 0.91kg shells, 1923 Model

Anti-aircraft guns in deck mounts

on side, all amidships

12 - 0.98" / 25.0 mm guns (4x3 guns), 0.57lbs / 0.26kg shells, 1918 Model

Anti-aircraft guns in deck mounts

on side, evenly spread

Weight of broadside 167 lbs / 76 kg

Shells per gun, main battery: 200

8 - 24.0" / 610 mm above water torpedoes

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 1.00" / 25 mm - 1.00" / 25 mm

2nd: 1.00" / 25 mm - -

3rd: 1.00" / 25 mm - -

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 2 shafts, 39,054 shp / 29,134 Kw = 34.50 kts

Range 5,000nm at 15.00 kts

Bunker at max displacement = 430 tons

Complement:

143 - 186

Cost:

£0.697 million / $2.790 million

Distribution of weights at normal displacement:

Armament: 20 tons, 1.1 %

Armour: 12 tons, 0.7 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 12 tons, 0.7 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 1,002 tons, 53.0 %

Hull, fittings & equipment: 509 tons, 26.9 %

Fuel, ammunition & stores: 297 tons, 15.7 %

Miscellaneous weights: 50 tons, 2.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

458 lbs / 208 Kg = 13.0 x 4.1 " / 105 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.23

Metacentric height 1.4 ft / 0.4 m

Roll period: 11.8 seconds

Steadiness - As gun platform (Average = 50 %): 70 %

- Recoil effect (Restricted arc if above 1.00): 0.29

Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:

Hull has a flush deck

and transom stern

Block coefficient: 0.400

Length to Beam Ratio: 11.68 : 1

'Natural speed' for length: 22.56 kts

Power going to wave formation at top speed: 64 %

Trim (Max stability = 0, Max steadiness = 100): 69

Bow angle (Positive = bow angles forward): 0.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 22.00 ft / 6.71 m

- Forecastle (20 %): 13.20 ft / 4.02 m

- Mid (50 %): 13.20 ft / 4.02 m

- Quarterdeck (15 %): 13.20 ft / 4.02 m

- Stern: 13.20 ft / 4.02 m

- Average freeboard: 13.90 ft / 4.24 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 182.5 %

- Above water (accommodation/working, high = better): 65.3 %

Waterplane Area: 8,321 Square feet or 773 Square metres

Displacement factor (Displacement / loading): 68 %

Structure weight / hull surface area: 32 lbs/sq ft or 157 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.50

- Longitudinal: 1.27

- Overall: 0.55

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is cramped

Ship has slow, easy roll, a good, steady gun platform

Ships: 9. C-D-1 to C-D-9

Displacement:

1,593 t light; 1,652 t standard; 1,891 t normal; 2,082 t full load

Dimensions: Length overall / water x beam x draught

390.00 ft / 390.00 ft x 33.40 ft x 12.70 ft (normal load)

118.87 m / 118.87 m 10.18 m x 3.87 m

Armament:

4 - 4.13" / 105 mm guns in single mounts, 36.00lbs / 16.33kg shells, 1921 Model

Dual purpose guns in deck mounts with hoists

on centreline ends, evenly spread, 2 raised mounts - superfiring

8 - 1.57" / 40.0 mm guns (2x4 guns), 2.00lbs / 0.91kg shells, 1923 Model

Anti-aircraft guns in deck mounts

on side, all amidships

12 - 0.98" / 25.0 mm guns (4x3 guns), 0.57lbs / 0.26kg shells, 1918 Model

Anti-aircraft guns in deck mounts

on side, evenly spread

Weight of broadside 167 lbs / 76 kg

Shells per gun, main battery: 200

8 - 24.0" / 610 mm above water torpedoes

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 1.00" / 25 mm - 1.00" / 25 mm

2nd: 1.00" / 25 mm - -

3rd: 1.00" / 25 mm - -

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 2 shafts, 39,054 shp / 29,134 Kw = 34.50 kts

Range 5,000nm at 15.00 kts

Bunker at max displacement = 430 tons

Complement:

143 - 186

Cost:

£0.697 million / $2.790 million

Distribution of weights at normal displacement:

Armament: 20 tons, 1.1 %

Armour: 12 tons, 0.7 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 12 tons, 0.7 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 1,002 tons, 53.0 %

Hull, fittings & equipment: 509 tons, 26.9 %

Fuel, ammunition & stores: 297 tons, 15.7 %

Miscellaneous weights: 50 tons, 2.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

458 lbs / 208 Kg = 13.0 x 4.1 " / 105 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.23

Metacentric height 1.4 ft / 0.4 m

Roll period: 11.8 seconds

Steadiness - As gun platform (Average = 50 %): 70 %

- Recoil effect (Restricted arc if above 1.00): 0.29

Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:

Hull has a flush deck

and transom stern

Block coefficient: 0.400

Length to Beam Ratio: 11.68 : 1

'Natural speed' for length: 22.56 kts

Power going to wave formation at top speed: 64 %

Trim (Max stability = 0, Max steadiness = 100): 69

Bow angle (Positive = bow angles forward): 0.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 22.00 ft / 6.71 m

- Forecastle (20 %): 13.20 ft / 4.02 m

- Mid (50 %): 13.20 ft / 4.02 m

- Quarterdeck (15 %): 13.20 ft / 4.02 m

- Stern: 13.20 ft / 4.02 m

- Average freeboard: 13.90 ft / 4.24 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 182.5 %

- Above water (accommodation/working, high = better): 65.3 %

Waterplane Area: 8,321 Square feet or 773 Square metres

Displacement factor (Displacement / loading): 68 %

Structure weight / hull surface area: 32 lbs/sq ft or 157 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.50

- Longitudinal: 1.27

- Overall: 0.55

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is cramped

Ship has slow, easy roll, a good, steady gun platform

Ships: 2. Arare, Ariake

Displacement:

652 t light; 673 t standard; 752 t normal; 812 t full load

Loading submergence 109 tons/feet

Dimensions:

260.00 ft x 25.00 ft x 9.00 ft (normal load)

79.25 m x 7.62 m x 2.74 m

Armament:

6 - 3.00" / 76 mm guns

Weight of broadside 81 lbs / 37 kg

2 - 18.0" / 457.2 mm above water torpedoes

Machinery:

Coal and oil fired boilers, steam turbines,

Direct drive, 2 shafts, 18,705 shp / 13,954 Kw = 30.00 kts

Range 1,200nm at 15.00 kts

Complement:

71 - 93

Cost:

£0.090 million / $0.362 million

Distribution of weights at normal displacement:

Armament: 10 tons, 1.3 %

Machinery: 422 tons, 56.1 %

Hull, fittings & equipment: 220 tons, 29.2 %

Fuel, ammunition & stores: 101 tons, 13.4 %

Miscellaneous weights: 0 tons, 0.0 %

Metacentric height 1.0

Remarks:

Caution: Hull subject to strain in open-sea

Hull space for machinery, storage & compartmentation is cramped

Room for accommodation & workspaces is adequate

Ship has slow, easy roll, a good, steady gun platform

Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.28

Shellfire needed to sink: 199 lbs / 90 Kg = 14.8 x 3.0 " / 76 mm shells

(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)

Torpedoes needed to sink: 0.2

(Approx number of typical torpedo hits needed to sink ship)

Relative steadiness as gun platform: 74 %

(Average = 50 %)

Relative rocking effect from firing to beam: 0.22

Relative quality as seaboat: 1.14

Hull form characteristics:

Block coefficient: 0.450

Sharpness coefficient: 0.31

Hull speed coefficient 'M': 8.74

'Natural speed' for length: 16.12 kts

Power going to wave formation at top speed: 70 %

Trim: 65

(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:

Underwater volume absorbed by magazines and engineering spaces: 191.3 %

Relative accommodation and working space: 112.1 %

(Average = 100%)

Displacement factor: 36 %

(Displacement relative to loading factors)

Relative cross-sectional hull strength: 0.53

(Structure weight / hull surface area: 28 lbs / square foot or 137 Kg / square metre)

Relative longitudinal hull strength: 1.69

(for 13.00 ft / 3.96 m average freeboard, freeboard adjustment 3.97 ft)

Relative composite hull strength: 0.60

Ships: 5. Kagero, Murakumo, Shinonome, Siranui, Usugumo.

Displacement:

476 t light; 490 t standard; 520 t normal; 542 t full load

Loading submergence 85 tons/feet

Dimensions:

230.00 ft x 22.00 ft x 8.00 ft (normal load)

70.10 m x 6.71 m x 2.44 m

Armament:

1 - 3.00" / 76 mm guns

5 - 2.24" / 57 mm guns

Weight of broadside 42 lbs / 19 kg

2 - 18.0" / 457.2 mm above water torpedoes

Machinery:

Coal and oil fired boilers, steam turbines,

Direct drive, 2 shafts, 18,428 shp / 13,747 Kw = 31.00 kts

Range 1,000nm at 12.00 kts

Caution: Delicate, lightweight machinery

Complement:

54 - 70

Cost:

£0.063 million / $0.252 million

Distribution of weights at normal displacement:

Armament: 5 tons, 1.0 %

Machinery: 300 tons, 57.6 %

Hull, fittings & equipment: 171 tons, 32.9 %

Fuel, ammunition & stores: 44 tons, 8.5 %

Miscellaneous weights: 0 tons, 0.0 %

Metacentric height 0.7

Remarks:

Caution: Hull subject to strain in open-sea

Hull space for machinery, storage & compartmentation is cramped

Room for accommodation & workspaces is adequate

Ship has slow, easy roll, a good, steady gun platform

Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.14

Shellfire needed to sink: 139 lbs / 63 Kg = 10.3 x 3.0 " / 76 mm shells

(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)

Torpedoes needed to sink: 0.2

(Approx number of typical torpedo hits needed to sink ship)

Relative steadiness as gun platform: 70 %

(Average = 50 %)

Relative rocking effect from firing to beam: 0.21

Relative quality as seaboat: 1.06

Hull form characteristics:

Block coefficient: 0.450

Sharpness coefficient: 0.31

Hull speed coefficient 'M': 8.74

'Natural speed' for length: 15.17 kts

Power going to wave formation at top speed: 74 %

Trim: 66

(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:

Underwater volume absorbed by magazines and engineering spaces: 193.6 %

Relative accommodation and working space: 108.7 %

(Average = 100%)

Displacement factor: 26 %

(Displacement relative to loading factors)

Relative cross-sectional hull strength: 0.52

(Structure weight / hull surface area: 27 lbs / square foot or 131 Kg / square metre)

Relative longitudinal hull strength: 2.25

(for 13.00 ft / 3.96 m average freeboard, freeboard adjustment 4.62 ft)

Relative composite hull strength: 0.60

Ships: 6. Aotaka, Hato, Hibari, Kari, Kiji, Tsubame.

Displacement:

260 t light; 266 t standard; 280 t normal; 289 t full load

Loading submergence 47 tons/feet

Dimensions:

170.00 ft x 18.00 ft x 8.00 ft (normal load)

51.82 m x 5.49 m x 2.44 m

Armament:

1 - 2.24" / 57 mm guns

2 - 1.77" / 45 mm guns

Weight of broadside 11 lbs / 5 kg

3 - 14.0" / 355.6 mm above water torpedoes

Machinery:

Coal and oil fired boilers, complex reciprocating steam engines,

Direct drive, 2 shafts, 8,765 ihp / 6,539 Kw = 27.50 kts

Range 1,000nm at 10.00 kts

Caution: Delicate, lightweight machinery

Complement:

34 - 44

Cost:

£0.035 million / $0.139 million

Distribution of weights at normal displacement:

Armament: 1 tons, 0.5 %

Machinery: 175 tons, 62.6 %

Hull, fittings & equipment: 83 tons, 29.8 %

Fuel, ammunition & stores: 20 tons, 7.2 %

Miscellaneous weights: 0 tons, 0.0 %

Metacentric height 0.5

Remarks:

Caution: Hull subject to strain in open-sea

Hull space for machinery, storage & compartmentation is extremely poor

Room for accommodation & workspaces is cramped

Ship has slow, easy roll, a good, steady gun platform

Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.16

Shellfire needed to sink: 61 lbs / 28 Kg = 10.8 x 2.2 " / 57 mm shells

(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)

Torpedoes needed to sink: 0.1

(Approx number of typical torpedo hits needed to sink ship)

Relative steadiness as gun platform: 70 %

(Average = 50 %)

Relative rocking effect from firing to beam: 0.10

Relative quality as seaboat: 1.06

Hull form characteristics:

Block coefficient: 0.400

Sharpness coefficient: 0.30

Hull speed coefficient 'M': 7.94

'Natural speed' for length: 13.04 kts

Power going to wave formation at top speed: 74 %

Trim: 66

(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:

Underwater volume absorbed by magazines and engineering spaces: 205.6 %

Relative accommodation and working space: 68.8 %

(Average = 100%)

Displacement factor: 15 %

(Displacement relative to loading factors)

Relative cross-sectional hull strength: 0.51

(Structure weight / hull surface area: 21 lbs / square foot or 104 Kg / square metre)

Relative longitudinal hull strength: 2.97

(for 10.60 ft / 3.23 m average freeboard, freeboard adjustment 3.19 ft)

Relative composite hull strength: 0.61

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