WesWorld

Here's a proposed German light (6,000 ton standard) light cruiser. The loss of 2,000 tons from the Leipzig-class ships is easily noticeable in the twin versus triple 15cm guns, the 88mm vs 105mm secondary battery, and the 533mm vs 600mm torpedo tubes. But she is cheaper and faster, so she may find a place in the fleet.


CL-1930, German Light Cruiser laid down 1930

Displacement:
5,750 t light; 5,972 t standard; 6,555 t normal; 7,022 t full load

Dimensions: Length overall / water x beam x draught
565.22 ft / 557.74 ft x 56.76 ft x 15.42 ft (normal load)
172.28 m / 170.00 m x 17.30 m x 4.70 m

Armament:
6 - 5.91" / 150 mm guns (3x2 guns), 102.98lbs / 46.71kg shells, 1930 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
2 - 3.46" / 88.0 mm guns (1x2 guns), 20.79lbs / 9.43kg shells, 1930 Model
Dual purpose guns in deck mount
on centreline aft, all raised guns - superfiring
8 - 3.46" / 88.0 mm guns (4x2 guns), 20.79lbs / 9.43kg shells, 1930 Model
Dual purpose guns in deck mounts
on side, evenly spread
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1930 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1930 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 840 lbs / 381 kg
Shells per gun, main battery: 180
16 - 21.0" / 533 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.76" / 70 mm 399.08 ft / 121.64 m 9.06 ft / 2.76 m
Ends: Unarmoured
Main Belt covers 110 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.54" / 90 mm 1.97" / 50 mm 3.54" / 90 mm
2nd: 1.57" / 40 mm 0.79" / 20 mm -
3rd: 1.57" / 40 mm 0.79" / 20 mm -
4th: 0.79" / 20 mm 0.39" / 10 mm -
5th: 0.39" / 10 mm - -

- Armour deck: 0.98" / 25 mm, Conning tower: 2.76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 64,497 shp / 48,115 Kw = 33.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 1,050 tons

Complement:
363 - 473

Cost:
£2.355 million / $9.419 million

Distribution of weights at normal displacement:
Armament: 105 tons, 1.6 %
Armour: 1,022 tons, 15.6 %
- Belts: 408 tons, 6.2 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 204 tons, 3.1 %
- Armour Deck: 389 tons, 5.9 %
- Conning Tower: 21 tons, 0.3 %
Machinery: 1,954 tons, 29.8 %
Hull, fittings & equipment: 2,648 tons, 40.4 %
Fuel, ammunition & stores: 806 tons, 12.3 %
Miscellaneous weights: 20 tons, 0.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7,185 lbs / 3,259 Kg = 69.8 x 5.9 " / 150 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 2.8 ft / 0.9 m
Roll period: 14.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.29
Seaboat quality (Average = 1.00): 1.06

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.470
Length to Beam Ratio: 9.83 : 1
'Natural speed' for length: 27.09 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 66
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: 27.89 ft / 8.50 m
- Forecastle (16 %): 19.69 ft / 6.00 m
- Mid (60 %): 19.69 ft / 6.00 m (17.22 ft / 5.25 m aft of break)
- Quarterdeck (12 %): 17.22 ft / 5.25 m
- Stern: 17.22 ft / 5.25 m
- Average freeboard: 19.24 ft / 5.86 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 110.0 %
- Above water (accommodation/working, high = better): 136.8 %
Waterplane Area: 21,342 Square feet or 1,983 Square metres
Displacement factor (Displacement / loading): 113 %
Structure weight / hull surface area: 82 lbs/sq ft or 399 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.87
- Longitudinal: 1.22
- Overall: 0.90
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

20 tons reserved for future growth.

Reminds me of the historical ARETHUSA somehow. I just wonder if 180 shells/barrel are enought for a cruiser like her. Otherwise she looks good on paper.

She´s designed to the latest rules discussed, correct?

Correct, she's designed to the updated hull strength rules. Arethusa's in the same size range and has a similar main armament.

The 15cm gun has a rate of fire of between 6 and 8 rpm, so the magazines will run dry after between 20 and 30 minutes. More ammunition wouldn't hurt, but it's not that critical. Historically the Arethusa's carried 200 rounds per gun, while the German K-class CLs carried 120 and the later Liepzig and Nurnberg carried between 120 and 150 rounds per gun, so 180 looks OK to me.

All of my 15cm designs are simmed with 200 rounds (except the Tange class for Chosen and Formosa). In general I look at 150-200 for guns around 6 inch.

My latest have 250, but they're designed to have a lot of beer space spare capacity. It also means they can do extended war cruises where ammunition supply might be a problem; fuel oil is fairly easy to obtain.

RLBH

I think it's a much more reasonable outcome for a 6,000 t cruiser than others we had under the previous rules.

I assume you didn't just want to accept a lesser number of 600 mm tubes? Germany ought to settle on one caliber of torpedo, I think, otherwise coordinating attacks by dfferent classes of vessel gets to be awkward.

Correct, just wasn't going to accept the smaller salvo. These ships could be assigned to work with the Z-200 class DDs, they have the 533mm torps as well, it's only the newest design DDs that have the big 600mm torps.

Further revision: a knot slower, 1000 tons larger, a bit better armored, and armed with 9 150mms vs 6. Ships or plans are available from HDW, if any countries are interested.


CL30, German Light Cruiser laid down 1930

Displacement:
6,799 t light; 7,076 t standard; 7,719 t normal; 8,233 t full load

Dimensions: Length overall / water x beam x draught
565.43 ft / 557.74 ft x 59.06 ft x 16.40 ft (normal load)
172.34 m / 170.00 m x 18.00 m x 5.00 m

Armament:
9 - 5.91" / 150 mm guns (3x3 guns), 102.98lbs / 46.71kg shells, 1928 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
2 - 3.46" / 88.0 mm guns (1x2 guns), 20.79lbs / 9.43kg shells, 1930 Model
Dual purpose guns in deck mount
on centreline aft
8 - 3.46" / 88.0 mm guns (4x2 guns), 20.79lbs / 9.43kg shells, 1930 Model
Dual purpose guns in deck mounts
on side, evenly spread
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1930 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1930 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 1,149 lbs / 521 kg
Shells per gun, main battery: 180
16 - 21.0" / 533 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.94" / 100 mm 356.96 ft / 108.80 m 9.22 ft / 2.81 m
Ends: Unarmoured
Main Belt covers 98 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.94" / 100 mm 1.97" / 50 mm 3.94" / 100 mm
2nd: 1.57" / 40 mm 0.79" / 20 mm -
3rd: 1.57" / 40 mm 0.79" / 20 mm -
4th: 0.79" / 20 mm 0.39" / 10 mm -
5th: 0.39" / 10 mm - -

- Armour deck: 1.57" / 40 mm, Conning tower: 2.76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 64,349 shp / 48,004 Kw = 32.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 1,158 tons

Complement:
411 - 535

Cost:
£2.641 million / $10.565 million

Distribution of weights at normal displacement:
Armament: 144 tons, 1.9 %
Armour: 1,486 tons, 19.2 %
- Belts: 543 tons, 7.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 254 tons, 3.3 %
- Armour Deck: 665 tons, 8.6 %
- Conning Tower: 23 tons, 0.3 %
Machinery: 1,950 tons, 25.3 %
Hull, fittings & equipment: 3,190 tons, 41.3 %
Fuel, ammunition & stores: 920 tons, 11.9 %
Miscellaneous weights: 30 tons, 0.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10,979 lbs / 4,980 Kg = 106.6 x 5.9 " / 150 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.28
Metacentric height 3.5 ft / 1.1 m
Roll period: 13.2 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.24
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.500
Length to Beam Ratio: 9.44 : 1
'Natural speed' for length: 27.07 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 28.71 ft / 8.75 m
- Forecastle (21 %): 21.33 ft / 6.50 m (17.22 ft / 5.25 m aft of break)
- Mid (60 %): 17.22 ft / 5.25 m
- Quarterdeck (15 %): 17.22 ft / 5.25 m
- Stern: 17.22 ft / 5.25 m
- Average freeboard: 18.71 ft / 5.70 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 97.5 %
- Above water (accommodation/working, high = better): 121.3 %
Waterplane Area: 22,822 Square feet or 2,120 Square metres
Displacement factor (Displacement / loading): 118 %
Structure weight / hull surface area: 94 lbs/sq ft or 461 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.26
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

30 tons reserved for future growth.