WesWorld

DD31R46, Nordmark Destroyer laid down 1931

Displacement:
1,787 t light; 1,877 t standard; 2,164 t normal; 2,394 t full load

Dimensions: Length overall / water x beam x draught
365.37 ft / 360.01 ft x 35.99 ft x 12.99 ft (normal load)
111.36 m / 109.73 m x 10.97 m x 3.96 m

Armament:
4 - 4.33" / 110 mm guns in single mounts, 40.61lbs / 18.42kg shells, 1946 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts - superfiring
16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1946 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 194 lbs / 88 kg
Shells per gun, main battery: 400
6 - 24.0" / 610 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm -
2nd: 0.59" / 15 mm 0.39" / 10 mm -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 38,348 shp / 28,607 Kw = 33.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 517 tons

Complement:
158 - 206

Cost:
£0.993 million / $3.971 million

Distribution of weights at normal displacement:
Armament: 24 tons, 1.1 %
Armour: 14 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 14 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,033 tons, 47.7 %
Hull, fittings & equipment: 615 tons, 28.4 %
Fuel, ammunition & stores: 378 tons, 17.5 %
Miscellaneous weights: 100 tons, 4.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
688 lbs / 312 Kg = 16.9 x 4.3 " / 110 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.23
Metacentric height 1.6 ft / 0.5 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.35
Seaboat quality (Average = 1.00): 1.16

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.450
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 21.79 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 61
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.01 ft / 6.10 m
- Forecastle (30 %): 20.01 ft / 6.10 m
- Mid (50 %): 20.01 ft / 6.10 m (14.01 ft / 4.27 m aft of break)
- Quarterdeck (15 %): 14.01 ft / 4.27 m
- Stern: 14.01 ft / 4.27 m
- Average freeboard: 17.01 ft / 5.19 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 169.4 %
- Above water (accommodation/working, high = better): 97.7 %
Waterplane Area: 8,585 Square feet or 798 Square metres
Displacement factor (Displacement / loading): 83 %
Structure weight / hull surface area: 35 lbs/sq ft or 169 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.39
- Overall: 0.58
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform

5 tons general search radar
2 tons navigational radar
3 tons fire control radar
3 tons fire control computers
4 tons electronic-suite generators

36 tons torpedoes and support equipment

9 tons sonar
20 tons 40x depth charges and launching racks
8 tons 8x depth charges and forward throwing launchers

10 tons unplanned kipple allowance



Conversion to this should be a 25% refit, requiring a drydock (I've got plenty, after all). Per-ship tonnage 447 tons, tonnage for the full class of six 2,682. Time, three months.

Don't forget that small ship refits are charged less, so for a 25% refit you only spend 15% (time taken is still 25%) so that gives you 268 tons per ship = 1,608 tons for the whole class.

Stockholm, Nordmark Cruiser laid down 1931

Displacement:
12,101 t light; 12,629 t standard; 14,615 t normal; 16,203 t full load

Dimensions: Length overall / water x beam x draught
660.91 ft / 650.00 ft x 64.99 ft x 22.01 ft (normal load)
201.45 m / 198.12 m x 19.81 m x 6.71 m

Armament:
8 - 8.27" / 210 mm guns (4x2 guns), 282.57lbs / 128.17kg shells, 1931 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
16 - 3.54" / 90.0 mm guns (8x2 guns), 22.24lbs / 10.09kg shells, 1946 Model
Automatic rapid fire guns in deck mounts with hoists
on side, all amidships, 4 raised mounts - superfiring
32 - 1.57" / 40.0 mm guns (8x4 guns), 1.95lbs / 0.88kg shells, 1931 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 2,679 lbs / 1,215 kg
Shells per gun, main battery: 150
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 5.00" / 127 mm 479.99 ft / 146.30 m 10.01 ft / 3.05 m
Ends: Unarmoured
Main Belt covers 114 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5.98" / 152 mm 4.02" / 102 mm 5.00" / 127 mm
2nd: 0.98" / 25 mm 0.59" / 15 mm 0.98" / 25 mm

- Armour deck: 2.01" / 51 mm, Conning tower: 5.00" / 127 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 105,081 shp / 78,390 Kw = 32.00 kts
Range 12,500nm at 15.00 kts
Bunker at max displacement = 3,575 tons

Complement:
663 - 863

Cost:
£5.028 million / $20.112 million

Distribution of weights at normal displacement:
Armament: 344 tons, 2.4 %
Armour: 2,797 tons, 19.1 %
- Belts: 983 tons, 6.7 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 655 tons, 4.5 %
- Armour Deck: 1,095 tons, 7.5 %
- Conning Tower: 64 tons, 0.4 %
Machinery: 3,142 tons, 21.5 %
Hull, fittings & equipment: 5,528 tons, 37.8 %
Fuel, ammunition & stores: 2,513 tons, 17.2 %
Miscellaneous weights: 290 tons, 2.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
19,129 lbs / 8,677 Kg = 67.7 x 8.3 " / 210 mm shells or 2.0 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 3.3 ft / 1.0 m
Roll period: 15.0 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.57
Seaboat quality (Average = 1.00): 1.16

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.550
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 25.50 kts
Power going to wave formation at top speed: 55 %
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: 29.99 ft / 9.14 m
- Forecastle (20 %): 25.98 ft / 7.92 m
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (15 %): 18.01 ft / 5.49 m
- Stern: 18.01 ft / 5.49 m
- Average freeboard: 22.09 ft / 6.73 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 90.6 %
- Above water (accommodation/working, high = better): 157.2 %
Waterplane Area: 29,483 Square feet or 2,739 Square metres
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 116 lbs/sq ft or 569 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.30
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

5 tons general search radar
2 tons navgational radar
6 tons secondary fire control radar
12 tons primary fire control radar
15 tons fire control computers
10 tons electronic-suite generators

48 tons torpedoes and support equipment


Total refit cost for two: 6,050 tons, no drydock neccessary.

It looks as though you are doing a 25% Refit on them (judging by the cost) though that's not explicit. You might want to consider specifying what all is involved, as the top cost (driven by replacing the AA outfit with modern 90mm autos) would allow you to upgrade the LAA outfit as well (subject to getting a good SS result). It would also be helpful to us in evaluating your proposal.

Ah, right.

In this case, what's involved is the general lifespan extension work that they're due for anyway, secondary DP 110mm getting replaced with Auto 90mm, and the older 37mm AA mounts being replaced by modern radar-directed 40mm mounts. 20mm or machine gun mounts aren't considered viable to tie in to the radar aiming system, and thus aren't under consideration. A heavier armor suite would be nice, but-

*pause*

*squint*

And also, replacing the 533mm torpedoes with new 610mm ones. One second.



Stockholm, Nordmark Cruiser laid down 1931

Displacement:
12,101 t light; 12,629 t standard; 14,615 t normal; 16,203 t full load

Dimensions: Length overall / water x beam x draught
660.91 ft / 650.00 ft x 64.99 ft x 22.01 ft (normal load)
201.45 m / 198.12 m x 19.81 m x 6.71 m

Armament:
8 - 8.27" / 210 mm guns (4x2 guns), 282.57lbs / 128.17kg shells, 1931 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
16 - 3.54" / 90.0 mm guns (8x2 guns), 22.24lbs / 10.09kg shells, 1946 Model
Automatic rapid fire guns in deck mounts with hoists
on side, all amidships, 4 raised mounts - superfiring
32 - 1.57" / 40.0 mm guns (8x4 guns), 1.95lbs / 0.88kg shells, 1931 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 2,679 lbs / 1,215 kg
Shells per gun, main battery: 150
8 - 24.0" / 610 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 5.00" / 127 mm 479.99 ft / 146.30 m 10.01 ft / 3.05 m
Ends: Unarmoured
Main Belt covers 114 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5.98" / 152 mm 4.02" / 102 mm 5.00" / 127 mm
2nd: 0.98" / 25 mm 0.59" / 15 mm 0.98" / 25 mm

- Armour deck: 2.01" / 51 mm, Conning tower: 5.00" / 127 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 105,081 shp / 78,390 Kw = 32.00 kts
Range 12,500nm at 15.00 kts
Bunker at max displacement = 3,575 tons

Complement:
663 - 863

Cost:
£5.028 million / $20.112 million

Distribution of weights at normal displacement:
Armament: 344 tons, 2.4 %
Armour: 2,797 tons, 19.1 %
- Belts: 983 tons, 6.7 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 655 tons, 4.5 %
- Armour Deck: 1,095 tons, 7.5 %
- Conning Tower: 64 tons, 0.4 %
Machinery: 3,142 tons, 21.5 %
Hull, fittings & equipment: 5,528 tons, 37.8 %
Fuel, ammunition & stores: 2,513 tons, 17.2 %
Miscellaneous weights: 290 tons, 2.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
19,129 lbs / 8,677 Kg = 67.7 x 8.3 " / 210 mm shells or 2.0 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 3.3 ft / 1.0 m
Roll period: 15.0 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.57
Seaboat quality (Average = 1.00): 1.16

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.550
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 25.50 kts
Power going to wave formation at top speed: 55 %
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: 29.99 ft / 9.14 m
- Forecastle (20 %): 25.98 ft / 7.92 m
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (15 %): 18.01 ft / 5.49 m
- Stern: 18.01 ft / 5.49 m
- Average freeboard: 22.09 ft / 6.73 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 90.6 %
- Above water (accommodation/working, high = better): 149.9 %
Waterplane Area: 29,483 Square feet or 2,739 Square metres
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 116 lbs/sq ft or 569 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.30
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

5 tons general search radar
2 tons navgational radar
6 tons secondary fire control radar
12 tons primary fire control radar
15 tons fire control computers
10 tons electronic-suite generators

48 tons torpedoes and support equipment


I'd already allocated the weight for those, just forgot to tweak the Weapons tab entry. Really, the Stockholms are considered close enough to modern that any attempt to improve them drastically would be non-cost-effective. No matter how much I'd otherwise sweat about the light armor fit.

Yes, I agree. The Stockholms are worth refitting but only so much. What had caught my eye was the retention of the old 37mm mounts in your first iteration - it seemed odd. I usually find it worth putting in the notes what has been changed/added/removed.

Looks good to me, a sound refit, though personally speaking I wouldn't mind some 20mm just as a last-ditch defence item or for scaring wandering fishermen.

Generally I give 1930+ era ships a modest 25% refit just to freshen the ship up more than anything. Replacing worn items, internal items for habitability mainly and adding some newer electronic items and such. I figure anything older than 1929 is closer to Great War era tech and the mechanicals and boilers are more worn so need replacing and that's when the 50% refit comes into play and then you start wondering whether to bother and build afresh.