WesWorld

Designed as a replacement for older DD's the J class compairs well to the American Farragut, South African Pontoporeia and Italian Soldati class ships.

J class , Atlantean Destroyer laid down 1932



Displacement:
1,583 t light; 1,667 t standard; 1,906 t normal; 2,096 t full load

Dimensions: Length overall / water x beam x draught
384.37 ft / 375.00 ft x 36.00 ft x 12.20 ft (normal load)
117.16 m / 114.30 m x 10.97 m x 3.72 m

Armament:
6 - 5.10" / 130 mm guns (3x2 guns), 66.33lbs / 30.09kg shells, 1932 Model
Dual purpose guns in deck mounts
on centreline ends, majority forward, 1 raised mount - superfiring
4 - 1.58" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
6 - 0.79" / 20.0 mm guns (3x2 guns), 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
6 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1932 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 408 lbs / 185 kg
Shells per gun, main battery: 200
10 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 1.00" / 25 mm -

- Conning tower: 1.57" / 40 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 37,907 shp / 28,279 Kw = 34.00 kts
Range 5,400nm at 15.00 kts
Bunker at max displacement = 429 tons

Complement:
143 - 187

Cost:
£1.019 million / $4.078 million

Distribution of weights at normal displacement:
Armament: 51 tons, 2.7 %
Armour: 26 tons, 1.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 21 tons, 1.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 5 tons, 0.3 %
Machinery: 901 tons, 47.3 %
Hull, fittings & equipment: 570 tons, 29.9 %
Fuel, ammunition & stores: 323 tons, 16.9 %
Miscellaneous weights: 35 tons, 1.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
631 lbs / 286 Kg = 9.5 x 5.1 " / 130 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.54
Metacentric height 2.2 ft / 0.7 m
Roll period: 10.1 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.23
Seaboat quality (Average = 1.00): 1.16

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.405
Length to Beam Ratio: 10.42 : 1
'Natural speed' for length: 22.31 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 43
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: 25.75 ft / 7.85 m
- Forecastle (20 %): 20.50 ft / 6.25 m
- Mid (40 %): 20.50 ft / 6.25 m (12.00 ft / 3.66 m aft of break)
- Quarterdeck (15 %): 12.00 ft / 3.66 m
- Stern: 12.00 ft / 3.66 m
- Average freeboard: 15.82 ft / 4.82 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 175.7 %
- Above water (accommodation/working, high = better): 82.4 %
Waterplane Area: 8,650 Square feet or 804 Square metres
Displacement factor (Displacement / loading): 70 %
Structure weight / hull surface area: 34 lbs/sq ft or 166 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.95
- Overall: 0.57
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped

9 tons for sonar
10 tons for 10x21" torpedo's
14 tons for 60 DC's
2 tons for ASW equipment

I like her very much!

Packs a punch with those six 130mm and the ten torpedoes. Nice speed too, not too slow and not too fast, very doable and econonmical.

Great drawing as ever, I like the high tubes, nice and dry. I take those are torpedo reloading cranes aft of the tubes?

Those are indeed reload cranes. I orriginally tinkered with reload racks like the Japanese DD's but they ruined her looks!

Quoted

I orriginally tinkered with reload racks like the Japanese DD's but they ruined her looks!

I hope you have learned your lesson: do not steal details from Japanese warships for Atlantean warships. It will just make your ships look ugly.

Ha! The Turks learned that with the Osmanieh!! Again the pagoda looked horrendous!! Thats why she recieved the tower structure.

A great design which looks a bit top heavy to me. She really compares well to foreign designs.

However, I wonder if single mounts on a DD aren´t a better choice due to their higher ROF...

The TT banks probably have limited arcs forward because of those 40mm mounts. Hardly a problem but a chance for improvements.

doesn't 375' need a type 2 slip?

No, the break point is 393' or 120m for a Type 1.

Sorry, my mistake!

For the torpedoes they weigh about 1.6tons each * 10 = 16 tons. *1.25 for weight of launcher and thats 20tons not 10t.

Compares reasonably well to the Soldati but they are more designed for ASW and have the massive AA firepower as well.

I'd mount the torpedoes a deck lower to reduce topweight. Might want to think about open 130mm mountings as well for same reason.

As far as I know the weight of torpedo tuibes is included in the armament weight.

Quoted

10 - 21.0" / 533.4 mm above water torpedoes

I orriginally calculated the torps as 1 ton each but as you say after reading my own source material they seem to be close to 1.5-1.6 tons. The 2 tons for anti sub equipment can instead go to reloads.

Enclosed 5.1" mounts and high torpedo tubes are more or less to protect from the elements.

Quoted

As far as I know the weight of torpedo tuibes is included in the armament weight.

Never was so misc weights is needed for that.
Try putting 100 tubes on the DD and see how much the hull strength changes.

Interesting, looks like the reloads will go out the window then.

Why on earth would the torpedo tubes be listed and not included in the weight? There are plenty of other armaments on a ship that can't be listed, so why not simply require that the user edit the number of TT's into the design?

Quoted

Interesting, looks like the reloads will go out the window then.

... or add more miscellaneous weights.

Perhaps, it still doesn't aswer the question of why SS allows so many torpedo's on a design without consequences.

A turpedo tube is essentially a compressed air gun and its definately listed in the weapons tab in SS so therefore the weight should in theory be included in the armament weights.

My assumtion was that this was a problem in early incarnations of Springstyle/Sharp and had been fixed.

J Class with more misc. weight for torps, no reloads and speed reduced to maintain 0.50 CS strength

J class , Atlantean Destroyer laid down 1932

Displacement:
1,583 t light; 1,667 t standard; 1,906 t normal; 2,096 t full load

Dimensions: Length overall / water x beam x draught
384.37 ft / 375.00 ft x 36.00 ft x 12.20 ft (normal load)
117.16 m / 114.30 m x 10.97 m x 3.72 m

Armament:
6 - 5.10" / 130 mm guns (3x2 guns), 66.33lbs / 30.09kg shells, 1932 Model
Dual purpose guns in deck mounts
on centreline ends, majority forward, 1 raised mount - superfiring
4 - 1.58" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
6 - 0.79" / 20.0 mm guns (3x2 guns), 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
6 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1932 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 408 lbs / 185 kg
Shells per gun, main battery: 200
10 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 1.00" / 25 mm -

- Conning tower: 1.57" / 40 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 36,776 shp / 27,435 Kw = 33.75 kts
Range 5,400nm at 15.00 kts
Bunker at max displacement = 429 tons

Complement:
143 - 187

Cost:
£1.010 million / $4.039 million

Distribution of weights at normal displacement:
Armament: 51 tons, 2.7 %
Armour: 26 tons, 1.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 21 tons, 1.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 5 tons, 0.3 %
Machinery: 885 tons, 46.4 %
Hull, fittings & equipment: 576 tons, 30.2 %
Fuel, ammunition & stores: 323 tons, 16.9 %
Miscellaneous weights: 45 tons, 2.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
652 lbs / 296 Kg = 9.8 x 5.1 " / 130 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.53
Metacentric height 2.2 ft / 0.7 m
Roll period: 10.2 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.23
Seaboat quality (Average = 1.00): 1.17

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.405
Length to Beam Ratio: 10.42 : 1
'Natural speed' for length: 22.31 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 42
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: 25.75 ft / 7.85 m
- Forecastle (20 %): 20.50 ft / 6.25 m
- Mid (40 %): 20.50 ft / 6.25 m (12.00 ft / 3.66 m aft of break)
- Quarterdeck (15 %): 12.00 ft / 3.66 m
- Stern: 12.00 ft / 3.66 m
- Average freeboard: 15.82 ft / 4.82 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 173.6 %
- Above water (accommodation/working, high = better): 82.4 %
Waterplane Area: 8,650 Square feet or 804 Square metres
Displacement factor (Displacement / loading): 72 %
Structure weight / hull surface area: 34 lbs/sq ft or 168 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.97
- Overall: 0.58
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped

9 tons for sonar
20 tons for 10x21" torpedo's
14 tons for 60 DC's
2 tons for ASW equipment

SS only calculates the torpedo's impact on deckspace. Not its weight. I have mentioned before that the weight of the torpedoes+launchers need to be taken into account. From looking at weight figures for the Italian cruisers I arrived at 1.25*weight of torpedo