WesWorld

Russian Federation have plans for series of light cruiser classes, roughly following model of General Admiral Apraxin class. By 1928, number of new light cruisers will be in service, alleviating problems posed by present numerically weak Russian cruiser force. By then, Russia will not have laid down heavy cruiser in almost ten years.

Following design is presently being considered:

Admiral Makarov class heavy cruisers, laid down 1928

Length, 220.0 m x Beam, 22.0 m x Depth, 6.8 m
14932 tonnes normal displacement (13184 tonnes standard)

Main battery: 9 x 21.0-cm (3 x 3)
Secondary battery: 6 x 13.0-cm (6 x 1)
AA battery: 24 x 3.7-cm

Weight of broadside: 1356 kg

12 TT, 53.0 cm in two sextuple mounts

Main belt, 12.0 cm; ends unarmored
Armor deck, average 5.0 cm
Conning tower, 10.0 cm

Battery armor:
Main, 15.0 cm / secondary, 2.5 cm
AA, 2.5 cm shields

Aircraft - 2 Seaplanes, 1 catapult

Maximum speed for 82729 shaft kw = 33.00 knots
Approximate cruising radius, 10200 nm / 15 knots

Typical complement: 675-878


Estimated cost, $18.917 million (£4.729 million)

Remarks:

Relative extent of belt armor, 95 percent of 'typical' coverage.

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

Ship is roomy, with superior accommodation and working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 373 tonnes = 2 pct
Armor, total ..................... 2724 tonnes = 18 pct

Belt 883 tonnes = 6 pct
Deck 1111 tonnes = 7 pct
C.T. 52 tonnes = 0 pct
Armament 679 tonnes = 5 pct

Machinery ........................ 3451 tonnes = 23 pct
Hull and fittings; equipment ..... 6039 tonnes = 40 pct
Fuel, ammunition, stores ......... 2295 tonnes = 15 pct
Miscellaneous weights ............ 50 tonnes = 0 pct
-----
14932 tonnes = 100 pct

Estimated metacentric height, 1.3 m

Displacement summary:

Light ship: 12637 tonnes
Standard displacement: 13184 tonnes
Normal service: 14932 tonnes
Full load: 16271 tonnes

Loading submergence 2858 tonnes/metre

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Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.21

Shellfire needed to sink: 8323 kg = 64.8 x 21.0-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 2.1
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 70 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.37

Relative quality as a seaboat: 1.17

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Hull form characteristics:

Block coefficient: 0.45
Sharpness coefficient: 0.31
Hull speed coefficient 'M' = 8.96
'Natural speed' for length = 26.9 knots
Power going to wave formation
at top speed: 51 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 95 percent

Relative accommodation and working space: 139 percent


Displacement factor: 119 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.00
(Structure weight per square
metre of hull surface: 608 kg)

Relative longitudinal hull strength: 1.00
(for 5.85 m average freeboard;
freeboard adjustment +0.85 m)

Relative composite hull strength: 1.00

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[Machine-readable parameters: Spring Style v. 1.2.1]

721.60 x 72.16 x 22.30; 19.19 -- Dimensions
0.45 -- Block coefficient
1928 -- Year laid down
33.00 / 10200 / 15.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
50 tons -- Miscellaneous weights
++++++++++
9 x 8.27; 3; 0 -- Main battery; turrets; superfiring
:
6 x 5.12; 6 -- Secondary battery; turrets
:
24 x 1.46 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
12 / 0 / 20.87 -- TT / submerged / size
++++++++++
4.72 / 0.00 / 0.00 / 0.00; 95 -- Belt armor; relative extent
1.97 / 3.94 -- Deck / CT
5.91 / 0.98 / 0.98 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


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First thought: Impressive.

Second thought: Why can put so much on that ship and why can it be that fast?

Third thought: What´s the designs bc?

Fourth thought: AHA! Gotcha!....

Honestly, I doubt a bc of 0,45 is very realistic for a 13kts heavy cruiser....

Cheers,

HoOmAn

Well, 0.46 was sufficient for a 27kton CB, USS Alaska.

The other trick is no superfiring turrets. Since she's 220m long, there's room.

And her seakeeping is a touch less than my usual.

hummm if you choose to go with non-superfiring turrets, why not going one step beyond and make them quadruples?

33 knots is very fast indeed, but 31 knots is also very good. Leaving out those 2 knots you get room for more armor and weapons. I'd rather have a couple inches more of armor in some spots, and 3 more guns, than 2 extra knots

Other than adding armor and weapons and cutting down the speed I have increased a bit the beam of the ship and changed the freeboard. This is the result:

Enter ship name, Enter country Enter ship type laid down 1928

Displacement:
12.695 t light; 13.316 t standard; 15.083 t normal; 16.435 t full load
Loading submergence 880 tons/feet

Dimensions:
721,60 ft x 72,90 ft x 22,30 ft (normal load)
219,94 m x 22,22 m x 6,80 m

Armament:
12 - 8,27" / 210 mm guns (3 Main turrets x 4 guns)
6 - 5,12" / 130 mm guns (6 2nd turrets x 1 guns)
24 - 1,46" / 37 mm AA guns
Weight of broadside 3.834 lbs / 1.739 kg
12 - 21,0" / 533,4 mm above water torpedoes

Armour:
Belt 5,72" / 145 mm, ends unarmoured
Belts cover 85 % of normal area
Main turrets 6,41" / 163 mm, 2nd turrets 0,98" / 25 mm
AA gun shields 0,98" / 25 mm
Armour deck 2,50" / 64 mm, Conning tower 3,94" / 100 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 87.538 shp / 65.303 Kw = 31,00 kts
Range 10.200nm at 15,00 kts

Complement:
680 - 884

Cost:
£4,690 million / $18,761 million

Distribution of weights at normal displacement:
Armament: 479 tons, 3,2 %
Armour: 3.201 tons, 21,2 %
Belts: 959 tons, 6,4 %, Armament: 765 tons, 5,1 %, Armour Deck: 1.425 tons, 9,4 %
Conning Tower: 52 tons, 0,3 %, Torpedo bulkhead: 0 tons, 0,0 %
Machinery: 2.725 tons, 18,1 %
Hull, fittings & equipment: 6.240 tons, 41,4 %
Fuel, ammunition & stores: 2.388 tons, 15,8 %
Miscellaneous weights: 50 tons, 0,3 %

Metacentric height 4,4

Remarks:
Hull space for machinery, storage & compartmentation is adequate
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1,21
Shellfire needed to sink: 20.581 lbs / 9.335 Kg = 72,8 x 8,3 " / 210 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2,4
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 71 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,45
Relative quality as seaboat: 1,29

Hull form characteristics:
Block coefficient: 0,450
Sharpness coefficient: 0,32
Hull speed coefficient 'M': 8,93
'Natural speed' for length: 26,86 kts
Power going to wave formation at top speed: 47 %
Trim: 55
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 84,0 %
Relative accommodation and working space: 136,0 %
(Average = 100%)
Displacement factor: 120 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,99
(Structure weight / hull surface area: 128 lbs / square foot or 627 Kg / square metre)
Relative longitudinal hull strength: 1,00
(for 18,70 ft / 5,70 m average freeboard, freeboard adjustment 2,26 ft)
Relative composite hull strength: 1,00




Very impressive for 13300 tons standard....

The Sviatoslav class; Sviatoslav, Sviatopolk, Peresvet , and Osylyba , laid down in 1919, have 3x4 21cm and 31kts speed.

http://admkuznetsov.tripod.com/fantasy_fleets/id18.html

The 1928 requirement is for something with a bit more speed and range than the Sviatoslavs.

HMS Kent sims with a BC of about 0.43


6x130mm as secondary armament seems somewhat useless, doesn't it? Surely more ~4" would be better?

Quoted

6x130mm as secondary armament seems somewhat useless, doesn't it? Surely more ~4" would be better?

Don't think it hasn't occured to me.

Below is a design with the 6 secondaries in twin turrets on the centerline, superfiring. Keep in mind that I've got 220m length to work with! Put the seaplane on Q turret. That way, I can get 6x13cm per broadside. That's a little better.

Admiral Makarov class heavy cruisers, laid down 1928

Length, 220.0 m x Beam, 22.0 m x Depth, 6.8 m
14992 tonnes normal displacement (13271 tonnes standard)

Main battery: 6 x 13.0-cm (3 x 2; 3 superfiring)
Secondary battery: 9 x 21.0-cm (3 x 3)
AA battery: 24 x 3.7-cm

Weight of broadside: 1357 kg

12 TT, 53.0 cm in two sextuple mounts

Main belt, 12.0 cm; ends unarmored
Armor deck, average 5.0 cm
Conning tower, 10.0 cm

Battery armor:
Main, 2.5 cm / secondary, 15.0 cm
AA, 2.5 cm shields

Aircraft - 2 Seaplanes, 1 Catapult

Maximum speed for 83000 shaft kw = 33.00 knots
Approximate cruising radius, 10000 nm / 15 knots

Typical complement: 677-881


Estimated cost, $18.991 million (£4.748 million)

Remarks:

Relative extent of belt armor, 95 percent of 'typical' coverage.

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

Ship is roomy, with superior accommodation and working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 373 tonnes = 2 pct
Armor, total ..................... 2729 tonnes = 18 pct

Belt 879 tonnes = 6 pct
Deck 1114 tonnes = 7 pct
C.T. 52 tonnes = 0 pct
Armament 684 tonnes = 5 pct

Machinery ........................ 3463 tonnes = 23 pct
Hull and fittings; equipment ..... 6107 tonnes = 41 pct
Fuel, ammunition, stores ......... 2270 tonnes = 15 pct
Miscellaneous weights ............ 50 tonnes = 0 pct
-----
14992 tonnes = 100 pct

Estimated metacentric height, 1.3 m

Displacement summary:

Light ship: 12722 tonnes
Standard displacement: 13271 tonnes
Normal service: 14992 tonnes
Full load: 16309 tonnes

Loading submergence 2866 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.19

Shellfire needed to sink: 8313 kg = 272.5 x 13.0-cm shells
Or = 64.8 x 21.0-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 2.1
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 70 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.38

Relative quality as a seaboat: 1.16

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.45
Sharpness coefficient: 0.32
Hull speed coefficient 'M' = 8.95
'Natural speed' for length = 26.9 knots
Power going to wave formation
at top speed: 51 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 95 percent

Relative accommodation and working space: 149 percent


Displacement factor: 119 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.00
(Structure weight per square
metre of hull surface: 614 kg)

Relative longitudinal hull strength: 1.00
(for 5.85 m average freeboard;
freeboard adjustment +0.84 m)

Relative composite hull strength: 1.00

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

721.60 x 72.16 x 22.30; 19.19 -- Dimensions
0.45 -- Block coefficient
1928 -- Year laid down
33.00 / 10000 / 15.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
50 tons -- Miscellaneous weights
++++++++++
6 x 5.12; 3; 3 -- Main battery; turrets; superfiring
:
9 x 8.27; 3 -- Secondary battery; turrets
:
24 x 1.46 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
12 / 0 / 20.87 -- TT / submerged / size
++++++++++
4.72 / 0.00 / 0.00 / 0.00; 95 -- Belt armor; relative extent
1.97 / 3.94 -- Deck / CT
0.98 / 5.91 / 0.98 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


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