SDN World 3 Ship Design Thread

[Fingolfin_Noldor]

Well, I wanted to see how and what could be done to raise a 12 gun 18"/45 ship with suitably reasonable armoring with no bulges and reasonably modern arrangements and TDS. So here's the result.

Justinian, Byzantine Empire Battleship laid down 1927

Displacement:
65,598 t light; 69,791 t standard; 74,100 t normal; 77,548 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(854.97 ft / 836.61 ft) x 131.23 ft x (39.37 / 40.81 ft)
(260.60 m / 255.00 m) x 40.00 m x (12.00 / 12.44 m)

Armament:
12 - 18.00" / 457 mm 45.0 cal guns - 3,900.00lbs / 1,769.01kg shells, 90 per gun
Breech loading guns in turret on barbette mounts, 1927 Model
3 x Quad mounts on centreline ends, majority forward
1 raised mount - superfiring
20 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 400 per gun
Dual purpose guns in deck and hoist mounts, 1927 Model
10 x Twin mounts on sides, evenly spread
4 raised mounts
40 - 1.57" / 40.0 mm 56.0 cal guns - 2.12lbs / 0.96kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1927 Model
10 x Quad mounts on side ends, majority aft
4 raised mounts - superfiring
40 - 0.79" / 20.0 mm 70.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1927 Model
10 x Quad mounts on side ends, majority aft
16 - 0.50" / 12.7 mm 12.0 cal guns - 0.04lbs / 0.02kg shells, 4,000 per gun
Anti-air guns in deck mounts, 1927 Model
16 x 4-gun mounts on centreline, aft deck forward
Weight of broadside 48,082 lbs / 21,810 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 16.0" / 406 mm 435.00 ft / 132.59 m 19.00 ft / 5.79 m
Ends: Unarmoured
Main Belt covers 80 % of normal length
Main Belt inclined 19.00 degrees (positive = in)

- Torpedo Bulkhead - Additional damage containing bulkheads:
4.00" / 102 mm 430.00 ft / 131.06 m 40.00 ft / 12.19 m
Beam between torpedo bulkheads 90.00 ft / 27.43 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 26.0" / 660 mm 12.0" / 305 mm 19.0" / 483 mm
2nd: 3.00" / 76 mm 2.00" / 51 mm 3.00" / 76 mm
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -
5th: 0.50" / 13 mm - -

- Armoured deck - multiple decks:
For and Aft decks: 8.00" / 203 mm
Forecastle: 3.00" / 76 mm Quarter deck: 5.00" / 127 mm

- Conning towers: Forward 16.00" / 406 mm, Aft 8.00" / 203 mm

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 82,870 shp / 61,821 Kw = 24.00 kts
Range 10,000nm at 14.00 kts
Bunker at max displacement = 7,757 tons

Complement:
2,245 - 2,919

Cost:
£22.016 million / $88.064 million

Distribution of weights at normal displacement:
Armament: 5,715 tons, 7.7 %
- Guns: 5,715 tons, 7.7 %
Armour: 27,437 tons, 37.0 %
- Belts: 6,133 tons, 8.3 %
- Torpedo bulkhead: 2,546 tons, 3.4 %
- Armament: 6,514 tons, 8.8 %
- Armour Deck: 11,332 tons, 15.3 %
- Conning Towers: 912 tons, 1.2 %
Machinery: 2,616 tons, 3.5 %
Hull, fittings & equipment: 29,700 tons, 40.1 %
Fuel, ammunition & stores: 8,503 tons, 11.5 %
Miscellaneous weights: 130 tons, 0.2 %
- Hull above water: 30 tons
- On freeboard deck: 100 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
128,835 lbs / 58,438 Kg = 44.2 x 18.0 " / 457 mm shells or 26.6 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 10.2 ft / 3.1 m
Roll period: 17.2 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.83
Seaboat quality (Average = 1.00): 1.51

Hull form characteristics:
Hull has a flush deck,
an extended bulbous bow and large transom stern
Block coefficient (normal/deep): 0.600 / 0.606
Length to Beam Ratio: 6.38 : 1
'Natural speed' for length: 33.89 kts
Power going to wave formation at top speed: 42 %
Trim (Max stability = 0, Max steadiness = 100): 47
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 39.37 ft / 12.00 m, 26.25 ft / 8.00 m
- Forward deck: 30.00 %, 26.25 ft / 8.00 m, 21.98 ft / 6.70 m
- Aft deck: 35.00 %, 21.98 ft / 6.70 m, 22.31 ft / 6.80 m
- Quarter deck: 15.00 %, 22.31 ft / 6.80 m, 28.54 ft / 8.70 m
- Average freeboard: 25.10 ft / 7.65 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 79.4 %
- Above water (accommodation/working, high = better): 162.3 %
Waterplane Area: 83,690 Square feet or 7,775 Square metres
Displacement factor (Displacement / loading): 114 %
Structure weight / hull surface area: 284 lbs/sq ft or 1,386 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.66
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[Fingolfin_Noldor]

Or alternatively, if I reduce the height of my armor, made some adjustments to hull form, and reduced some other things, we get:

Justinian, Byzantine Empire Battleship laid down 1927

Displacement:
65,642 t light; 69,827 t standard; 73,730 t normal; 76,852 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(853.02 ft / 836.61 ft) x 131.23 ft x (39.37 / 40.68 ft)
(260.00 m / 255.00 m) x 40.00 m x (12.00 / 12.40 m)

Armament:
12 - 18.00" / 457 mm 45.0 cal guns - 3,900.00lbs / 1,769.01kg shells, 90 per gun
Breech loading guns in turret on barbette mounts, 1927 Model
4 x Triple mounts on centreline ends, evenly spread
2 raised mounts - superfiring
20 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 400 per gun
Dual purpose guns in deck and hoist mounts, 1927 Model
10 x Twin mounts on sides, evenly spread
4 raised mounts
40 - 1.57" / 40.0 mm 56.0 cal guns - 2.12lbs / 0.96kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1927 Model
10 x Quad mounts on side ends, majority aft
4 raised mounts - superfiring
40 - 0.79" / 20.0 mm 70.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1927 Model
10 x Quad mounts on side ends, majority aft
16 - 0.50" / 12.7 mm 12.0 cal guns - 0.04lbs / 0.02kg shells, 4,000 per gun
Anti-air guns in deck mounts, 1927 Model
16 x 4-gun mounts on centreline, aft deck forward
Weight of broadside 48,082 lbs / 21,810 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 16.0" / 406 mm 436.00 ft / 132.89 m 18.00 ft / 5.49 m
Ends: Unarmoured
Main Belt covers 80 % of normal length
Main Belt inclined 19.00 degrees (positive = in)

- Torpedo Bulkhead - Additional damage containing bulkheads:
4.00" / 102 mm 436.00 ft / 132.89 m 36.00 ft / 10.97 m
Beam between torpedo bulkheads 90.00 ft / 27.43 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 26.0" / 660 mm 12.0" / 305 mm 18.0" / 457 mm
2nd: 3.00" / 76 mm 2.00" / 51 mm 3.00" / 76 mm
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -
5th: 0.50" / 13 mm - -

- Armoured deck - multiple decks:
For and Aft decks: 8.00" / 203 mm
Forecastle: 3.00" / 76 mm Quarter deck: 4.50" / 114 mm

- Conning towers: Forward 16.00" / 406 mm, Aft 8.00" / 203 mm

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 82,537 shp / 61,573 Kw = 24.00 kts
Range 9,000nm at 14.00 kts
Bunker at max displacement = 7,025 tons

Complement:
2,236 - 2,908

Cost:
£22.016 million / $88.065 million

Distribution of weights at normal displacement:
Armament: 5,715 tons, 7.8 %
- Guns: 5,715 tons, 7.8 %
Armour: 27,662 tons, 37.5 %
- Belts: 5,818 tons, 7.9 %
- Torpedo bulkhead: 2,323 tons, 3.2 %
- Armament: 7,388 tons, 10.0 %
- Armour Deck: 11,223 tons, 15.2 %
- Conning Towers: 909 tons, 1.2 %
Machinery: 2,605 tons, 3.5 %
Hull, fittings & equipment: 29,530 tons, 40.1 %
Fuel, ammunition & stores: 8,088 tons, 11.0 %
Miscellaneous weights: 130 tons, 0.2 %
- Hull above water: 30 tons
- On freeboard deck: 100 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
117,973 lbs / 53,512 Kg = 40.5 x 18.0 " / 457 mm shells or 24.3 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 8.5 ft / 2.6 m
Roll period: 18.9 seconds
Steadiness - As gun platform (Average = 50 %): 74 %
- Recoil effect (Restricted arc if above 1.00): 0.95
Seaboat quality (Average = 1.00): 1.32

Hull form characteristics:
Hull has a flush deck,
an extended bulbous bow and large transom stern
Block coefficient (normal/deep): 0.597 / 0.602
Length to Beam Ratio: 6.38 : 1
'Natural speed' for length: 33.90 kts
Power going to wave formation at top speed: 42 %
Trim (Max stability = 0, Max steadiness = 100): 56
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 31.82 ft / 9.70 m, 26.02 ft / 7.93 m
- Forward deck: 30.00 %, 26.02 ft / 7.93 m, 20.24 ft / 6.17 m
- Aft deck: 35.00 %, 20.24 ft / 6.17 m, 20.24 ft / 6.17 m
- Quarter deck: 15.00 %, 20.24 ft / 6.17 m, 20.24 ft / 6.17 m
- Average freeboard: 22.73 ft / 6.93 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 79.7 %
- Above water (accommodation/working, high = better): 152.1 %
Waterplane Area: 83,451 Square feet or 7,753 Square metres
Displacement factor (Displacement / loading): 113 %
Structure weight / hull surface area: 288 lbs/sq ft or 1,404 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.46
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

[Thanas]

Here is the German cruiser evolution of the Blücher design, of which 2 might be commissioning in Q4 1926:

Blücher II, Germany Heavy Cruiser laid down 1925 (Engine 1926)

Displacement:
17,557 t light; 18,250 t standard; 22,871 t normal; 26,567 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(748.68 ft / 721.78 ft) x 78.74 ft x (29.53 / 32.88 ft)
(228.20 m / 220.00 m) x 24.00 m x (9.00 / 10.02 m)

Armament:
8 - 8.00" / 203 mm 60.0 cal guns - 280.40lbs / 127.19kg shells, 120 per gun
Breech loading guns in turret on barbette mounts, 1925 Model
4 x Twin mounts on centreline ends, evenly spread
2 raised mounts - superfiring
12 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 150 per gun
Dual purpose guns in deck and hoist mounts, 1925 Model
6 x Twin mounts on sides, evenly spread
24 - 1.57" / 40.0 mm 45.0 cal guns - 1.97lbs / 0.89kg shells, 250 per gun
Anti-air guns in deck and hoist mounts, 1925 Model
12 x Twin mounts on sides, evenly spread
24 - 0.79" / 20.0 mm 45.0 cal guns - 0.25lbs / 0.11kg shells, 400 per gun
Anti-air guns in deck and hoist mounts, 1925 Model
3 x 2 row octuple mounts on sides, evenly spread
3 raised mounts
Weight of broadside 3,008 lbs / 1,365 kg
12 - 21.0" / 533 mm, 23.95 ft / 7.30 m torpedoes - 1.554 t each, 18.653 t total
In 4 sets of submerged side tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 347.00 ft / 105.77 m 12.00 ft / 3.66 m
Ends: Unarmoured
Upper: 2.00" / 51 mm 347.00 ft / 105.77 m 20.00 ft / 6.10 m
Main Belt covers 74 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.00" / 203 mm 6.00" / 152 mm 7.00" / 178 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -

- Armoured deck - single deck: 4.00" / 102 mm For and Aft decks
Forecastle: 0.00" / 0 mm Quarter deck: 2.00" / 51 mm

- Conning towers: Forward 7.00" / 178 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Electric cruising motors plus geared drives, 4 shafts, 127,631 shp / 95,213 Kw = 33.00 kts
Range 10,000nm at 21.00 kts
Bunker at max displacement = 8,317 tons

Complement:
929 - 1,208

Cost:
£5.013 million / $20.051 million

Distribution of weights at normal displacement:
Armament: 843 tons, 3.7 %
- Guns: 825 tons, 3.6 %
- Torpedoes: 19 tons, 0.1 %
Armour: 5,171 tons, 22.6 %
- Belts: 1,702 tons, 7.4 %
- Armament: 867 tons, 3.8 %
- Armour Deck: 2,481 tons, 10.8 %
- Conning Tower: 122 tons, 0.5 %
Machinery: 4,085 tons, 17.9 %
Hull, fittings & equipment: 7,407 tons, 32.4 %
Fuel, ammunition & stores: 5,314 tons, 23.2 %
Miscellaneous weights: 50 tons, 0.2 %
- Above deck: 50 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
33,609 lbs / 15,245 Kg = 131.3 x 8.0 " / 203 mm shells or 3.2 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 4.2 ft / 1.3 m
Roll period: 16.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.37
Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:
Hull has a flush deck,
an extended bulbous bow and large transom stern
Block coefficient (normal/deep): 0.477 / 0.498
Length to Beam Ratio: 9.17 : 1
'Natural speed' for length: 30.96 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 9.84 ft / 3.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 29.53 ft / 9.00 m, 22.31 ft / 6.80 m
- Forward deck: 30.00 %, 22.31 ft / 6.80 m, 22.31 ft / 6.80 m
- Aft deck: 35.00 %, 22.31 ft / 6.80 m, 22.31 ft / 6.80 m
- Quarter deck: 15.00 %, 22.31 ft / 6.80 m, 22.31 ft / 6.80 m
- Average freeboard: 22.89 ft / 6.98 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 73.9 %
- Above water (accommodation/working, high = better): 176.4 %
Waterplane Area: 38,555 Square feet or 3,582 Square metres
Displacement factor (Displacement / loading): 137 %
Structure weight / hull surface area: 130 lbs/sq ft or 634 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.38
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

50t for 2 aircraft carried

Note that this depends on whether I misunderstood the carrier conversion costs - if I did, I will instead use the IBPs to construct two of these babies. Otherwise, this will remain a design study.

[Fingolfin_Noldor]

21knots cruise?! Oh wait, you have no torpedo bulkheads, and your main belt is a lot shorter than the one on my Sparta I/II class.

[Thanas]

21knots cruise?! Oh wait, you have no torpedo bulkheads, and your main belt is a lot shorter than the one on my Sparta I/II class.

Dammit. I mistakenly placed the bulkhead at upper belt armor. Stupid me.

Revised edition, sacrificing 1 knot of speed:

Blücher II, Germany Heavy Cruiser laid down 1925 (Engine 1926)

Displacement:
17,720 t light; 18,416 t standard; 23,063 t normal; 26,780 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(748.68 ft / 721.78 ft) x 78.74 ft x (29.53 / 32.89 ft)
(228.20 m / 220.00 m) x 24.00 m x (9.00 / 10.02 m)

Armament:
8 - 8.00" / 203 mm 60.0 cal guns - 280.40lbs / 127.19kg shells, 120 per gun
Breech loading guns in turret on barbette mounts, 1925 Model
4 x Twin mounts on centreline ends, evenly spread
2 raised mounts - superfiring
12 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 150 per gun
Dual purpose guns in turret on barbette mounts, 1925 Model
6 x Twin mounts on sides, evenly spread
24 - 1.57" / 40.0 mm 45.0 cal guns - 1.97lbs / 0.89kg shells, 250 per gun
Anti-air guns in deck and hoist mounts, 1925 Model
12 x Twin mounts on sides, evenly spread
24 - 0.79" / 20.0 mm 45.0 cal guns - 0.25lbs / 0.11kg shells, 400 per gun
Anti-air guns in deck and hoist mounts, 1925 Model
3 x 2 row octuple mounts on sides, evenly spread
3 raised mounts
Weight of broadside 3,008 lbs / 1,365 kg
12 - 21.0" / 533 mm, 23.95 ft / 7.30 m torpedoes - 1.554 t each, 18.653 t total
In 4 sets of submerged side tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 425.00 ft / 129.54 m 15.00 ft / 4.57 m
Ends: Unarmoured
Main Belt covers 91 % of normal length

- Torpedo Bulkhead:
2.00" / 51 mm 425.00 ft / 129.54 m 20.00 ft / 6.10 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 16.0" / 406 mm 6.00" / 152 mm 8.00" / 203 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -

- Armoured deck - single deck: 4.00" / 102 mm For and Aft decks
Forecastle: 0.00" / 0 mm Quarter deck: 2.00" / 51 mm

- Conning towers: Forward 7.00" / 178 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Electric cruising motors plus geared drives, 4 shafts, 114,245 shp / 85,227 Kw = 32.00 kts
Range 10,000nm at 21.00 kts
Bunker at max displacement = 8,363 tons

Complement:
935 - 1,216

Cost:
£4.835 million / $19.340 million

Distribution of weights at normal displacement:
Armament: 853 tons, 3.7 %
- Guns: 835 tons, 3.6 %
- Torpedoes: 19 tons, 0.1 %
Armour: 5,852 tons, 25.4 %
- Belts: 1,613 tons, 7.0 %
- Torpedo bulkhead: 629 tons, 2.7 %
- Armament: 998 tons, 4.3 %
- Armour Deck: 2,490 tons, 10.8 %
- Conning Tower: 122 tons, 0.5 %
Machinery: 3,657 tons, 15.9 %
Hull, fittings & equipment: 7,308 tons, 31.7 %
Fuel, ammunition & stores: 5,343 tons, 23.2 %
Miscellaneous weights: 50 tons, 0.2 %
- Above deck: 50 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
36,169 lbs / 16,406 Kg = 141.3 x 8.0 " / 203 mm shells or 5.4 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 4.3 ft / 1.3 m
Roll period: 15.9 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.34
Seaboat quality (Average = 1.00): 1.20

Hull form characteristics:
Hull has a flush deck,
an extended bulbous bow and large transom stern
Block coefficient (normal/deep): 0.481 / 0.501
Length to Beam Ratio: 9.17 : 1
'Natural speed' for length: 30.94 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 59
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 9.84 ft / 3.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 29.53 ft / 9.00 m, 21.00 ft / 6.40 m
- Forward deck: 30.00 %, 21.00 ft / 6.40 m, 20.67 ft / 6.30 m
- Aft deck: 35.00 %, 20.67 ft / 6.30 m, 20.67 ft / 6.30 m
- Quarter deck: 15.00 %, 20.67 ft / 6.30 m, 20.67 ft / 6.30 m
- Average freeboard: 21.47 ft / 6.54 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 90.1 %
- Above water (accommodation/working, high = better): 163.5 %
Waterplane Area: 38,695 Square feet or 3,595 Square metres
Displacement factor (Displacement / loading): 140 %
Structure weight / hull surface area: 130 lbs/sq ft or 635 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.24
- Overall: 1.00
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
Good seaboat, rides out heavy weather easily

50t for 2 aircraft carried

[Raesene]

21knots cruise?! Oh wait, you have no torpedo bulkheads, and your main belt is a lot shorter than the one on my Sparta I/II class.

Dammit. I mistakenly placed the bulkhead at upper belt armor. Stupid me.

Revised edition, sacrificing 1 knot of speed:

Blücher II, Germany Heavy Cruiser laid down 1925 (Engine 1926)

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 16.0" / 406 mm 6.00" / 152 mm 8.00" / 203 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -

16"" face turret face armour on a heavy cruiser with 8'' guns ?

[Thanas]

^a legitimate choice considering that a lot of people have either slower battleships relegated to convoy escort duties, some of which got 14" guns, or considering some people employ semi-battlecruisers in that role as well. The cruiser need to be able to escape if it is chanced upon in fog or something. This is also the reason for the high cruise speed - first, it is a better commerce raider with it and second, it is far easier to go from 21 knots to 32 knots instead from 15 to 31 knots.

Also, the face armor should be impenetrable to cruiser-type ammunitions.

[Raesene]

^a legitimate choice considering that a lot of people have either slower battleships relegated to convoy escort duties, some of which got 14" guns, or considering some people employ semi-battlecruisers in that role as well. The cruiser need to be able to escape if it is chanced upon in fog or something. This is also the reason for the high cruise speed - first, it is a better commerce raider with it and second, it is far easier to go from 21 knots to 32 knots instead from 15 to 31 knots.

Also, the face armor should be impenetrable to cruiser-type ammunitions.

The heavy face armour doesn't help you if the cruiser/convoy escort shell penetrates your belt or deck armour and ends up in the magazine anyway. I'd expect hits to the hull are more common than turret face hits (guesstimate; no actual data- does someone have any ?)
The argument for the high cruising speed sounds convincing. Maybe thats something the Tuscan designers will incorporate in one of the future designs...

[Thanas]

^a legitimate choice considering that a lot of people have either slower battleships relegated to convoy escort duties, some of which got 14" guns, or considering some people employ semi-battlecruisers in that role as well. The cruiser need to be able to escape if it is chanced upon in fog or something. This is also the reason for the high cruise speed - first, it is a better commerce raider with it and second, it is far easier to go from 21 knots to 32 knots instead from 15 to 31 knots.

Also, the face armor should be impenetrable to cruiser-type ammunitions.

The heavy face armour doesn't help you if the cruiser/convoy escort shell penetrates your belt or deck armour and ends up in the magazine anyway. I'd expect hits to the hull are more common than turret face hits (guesstimate; no actual data- does someone have any ?)

Depends. The german battlecruisers at Jutland were struck six times in the turrets, iirc (though only 3 times in the front, iirc). So turret hits are a possibility. The point is though, that there is nothing from keeping the shell from penetrating the belt/deck armor anyway except for a ridiculously heavy belt/deck armor (note that it already has 4" deck armor which is more than most british BB/BCs ever had).

However, adding additional face armor is relatively cheap and only costs a couple hundred tonnes each, so if you can prove that part of the turrets and allow them to respond with their own fire (even if they do not manage damaging hits, splinters alone and shell splashes might reduce the enemies effectiveness). So you get a pretty good bonus to the survival for the cost of...0.2 strength.

The argument for the high cruising speed sounds convincing. Maybe thats something the Tuscan designers will incorporate in one of the future designs...

Given how close our navies are operating and the shared information we have in IC, I would expect them to do so.

[Thanas]

A river gunboat I have been working on.

Donau, Germany River Gunboat laid down 1927

Displacement:
518 t light; 557 t standard; 566 t normal; 572 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(180.53 ft / 177.17 ft) x 36.09 ft x (6.56 / 6.62 ft)
(55.03 m / 54.00 m) x 11.00 m x (2.00 / 2.02 m)

Armament:
2 - 6.00" / 152 mm 45.0 cal guns - 108.92lbs / 49.41kg shells, 120 per gun
Quick firing guns in deck and hoist mounts, 1927 Model
2 x Single mounts on centreline, evenly spread
4 - 3.46" / 88.0 mm 56.0 cal guns - 22.52lbs / 10.21kg shells, 250 per gun
Dual purpose guns in deck and hoist mounts, 1927 Model
4 x Single mounts on centreline, evenly spread
8 - 0.79" / 20.0 mm 22.0 cal guns - 0.22lbs / 0.10kg shells, 450 per gun
Anti-air guns in deck and hoist mounts, 1927 Model
2 x 2 row quad mounts on sides amidships
12 - 0.31" / 7.9 mm 22.0 cal guns - 0.01lbs / 0.01kg shells, 8,000 per gun
Machine guns in deck mounts, 1927 Model
1 x Quad mount on centreline amidships (forward deck)
1 raised mount
8 x Single mounts on sides, evenly spread
Weight of broadside 310 lbs / 141 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.00" / 51 mm 81.00 ft / 24.69 m 6.00 ft / 1.83 m
Ends: Unarmoured
Main Belt covers 70 % of normal length
Main Belt inclined 20.00 degrees (positive = in)

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm
2nd: 1.00" / 25 mm - -
3rd: 1.00" / 25 mm - -

- Armoured deck - single deck:
For and Aft decks: 1.00" / 25 mm
Forecastle: 1.00" / 25 mm Quarter deck: 1.00" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 1 shaft, 935 shp / 697 Kw = 14.00 kts
Range 1,000nm at 8.00 kts
Bunker at max displacement = 15 tons

Complement:
57 - 75

Cost:
£0.197 million / $0.787 million

Distribution of weights at normal displacement:
Armament: 92 tons, 16.2 %
- Guns: 92 tons, 16.2 %
Armour: 152 tons, 26.8 %
- Belts: 49 tons, 8.6 %
- Armament: 29 tons, 5.1 %
- Armour Deck: 74 tons, 13.1 %
Machinery: 29 tons, 5.2 %
Hull, fittings & equipment: 245 tons, 43.3 %
Fuel, ammunition & stores: 48 tons, 8.5 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,088 lbs / 494 Kg = 10.1 x 6.0 " / 152 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.34
Metacentric height 1.8 ft / 0.6 m
Roll period: 11.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.28
Seaboat quality (Average = 1.00): 1.06

Hull form characteristics:
Hull has a flush deck,
a normal bow and a round stern
Block coefficient (normal/deep): 0.472 / 0.473
Length to Beam Ratio: 4.91 : 1
'Natural speed' for length: 13.31 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 66
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 7.22 ft / 2.20 m, 6.56 ft / 2.00 m
- Forward deck: 30.00 %, 6.56 ft / 2.00 m, 6.56 ft / 2.00 m
- Aft deck: 35.00 %, 6.56 ft / 2.00 m, 6.56 ft / 2.00 m
- Quarter deck: 15.00 %, 6.56 ft / 2.00 m, 6.56 ft / 2.00 m
- Average freeboard: 6.61 ft / 2.02 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 69.7 %
- Above water (accommodation/working, high = better): 87.1 %
Waterplane Area: 3,974 Square feet or 369 Square metres
Displacement factor (Displacement / loading): 110 %
Structure weight / hull surface area: 59 lbs/sq ft or 289 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.13
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Cramped accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform

Notes:
- yes, it is supposed to be that small and slow. The Danube and the Rhine as well as other rivers in the colonies are not the place for high-speed maneuvers
- yes, those guns are the 88mm gun known of WWII. I am aware that they are less effective against aircraft than the AA guns my navy uses, but my Navy does not go tank-busting on a river bank.
- unsure of what caliber length to give the machine guns.

[CmdrWilkens]

12 - 0.31" / 7.9 mm 22.0 cal guns - 0.01lbs / 0.01kg shells, 8,000 per gun
Machine guns in deck mounts, 1927 Model
1 x Quad mount on centreline amidships (forward deck)
1 raised mount
8 x Single mounts on sides, evenly spread

- unsure of what caliber length to give the machine guns.

I''m assuming that is meant to be using the 7.92x57mm IS cartridge which means the gun likely as not would resemble a descendant of the MG08/18...which has a barrel length of 720 mm...or about 91 calibers. As a point of comparison the M2 Browning is also a 90 caliber (.5" cartridge, 45" barrel) and I've used that for my ships.

[Thanas]

Yeah, it is supposed to be the MG08. Thanks.

I contemplated using the MG 30 instead, but those new MGs would just enter service now and therefore go towards elite units first. The main drawback of the MG08 (the weight) hardly matters that much on a ship anyway as it is mounted and not supposed to be schlepped around.

[Fingolfin_Noldor]

A little here, and a little there...

Magnificat, Byzantine Empire Battleship laid down 1927

Displacement:
61,018 t light; 64,912 t standard; 68,829 t normal; 71,964 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(784.12 ft / 767.72 ft) x 131.23 ft x (37.89 / 39.30 ft)
(239.00 m / 234.00 m) x 40.00 m x (11.55 / 11.98 m)

Armament:
12 - 18.00" / 457 mm 45.0 cal guns - 3,900.00lbs / 1,769.01kg shells, 80 per gun
Breech loading guns in turret on barbette mounts, 1927 Model
3 x 4-gun mounts on centreline ends, majority forward
1 raised mount - superfiring
20 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 500 per gun
Dual purpose guns in deck and hoist mounts, 1927 Model
10 x Twin mounts on sides, evenly spread
4 raised mounts
40 - 1.57" / 40.0 mm 56.0 cal guns - 2.12lbs / 0.96kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1927 Model
10 x Quad mounts on side ends, majority aft
4 raised mounts - superfiring
40 - 0.79" / 20.0 mm 70.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1927 Model
10 x Quad mounts on side ends, majority aft
16 - 0.50" / 12.7 mm 12.0 cal guns - 0.04lbs / 0.02kg shells, 4,000 per gun
Anti-air guns in deck mounts, 1927 Model
16 x 4-gun mounts on centreline, aft deck forward
Weight of broadside 48,082 lbs / 21,810 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 16.0" / 406 mm 424.00 ft / 129.24 m 16.20 ft / 4.94 m
Ends: Unarmoured
Main Belt covers 85 % of normal length
Main Belt inclined 19.00 degrees (positive = in)

- Torpedo Bulkhead - Additional damage containing bulkheads:
4.00" / 102 mm 424.00 ft / 129.24 m 40.00 ft / 12.19 m
Beam between torpedo bulkheads 91.00 ft / 27.74 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 26.0" / 660 mm 12.0" / 305 mm 19.0" / 483 mm
2nd: 3.00" / 76 mm 2.00" / 51 mm 3.00" / 76 mm
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -
5th: 0.50" / 13 mm - -

- Armoured deck - multiple decks:
For and Aft decks: 8.00" / 203 mm
Forecastle: 3.00" / 76 mm Quarter deck: 5.00" / 127 mm

- Conning towers: Forward 16.00" / 406 mm, Aft 8.00" / 203 mm

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 85,854 shp / 64,047 Kw = 24.00 kts
Range 10,000nm at 14.00 kts
Bunker at max displacement = 7,052 tons

Complement:
2,124 - 2,762

Cost:
£21.481 million / $85.924 million

Distribution of weights at normal displacement:
Armament: 6,882 tons, 10.0 %
- Guns: 6,882 tons, 10.0 %
Armour: 25,268 tons, 36.7 %
- Belts: 5,114 tons, 7.4 %
- Torpedo bulkhead: 2,510 tons, 3.6 %
- Armament: 6,244 tons, 9.1 %
- Armour Deck: 10,532 tons, 15.3 %
- Conning Towers: 868 tons, 1.3 %
Machinery: 2,710 tons, 3.9 %
Hull, fittings & equipment: 26,029 tons, 37.8 %
Fuel, ammunition & stores: 7,811 tons, 11.3 %
Miscellaneous weights: 130 tons, 0.2 %
- Hull above water: 30 tons
- On freeboard deck: 100 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
105,240 lbs / 47,736 Kg = 36.1 x 18.0 " / 457 mm shells or 21.6 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 9.9 ft / 3.0 m
Roll period: 17.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.79
Seaboat quality (Average = 1.00): 1.30

Hull form characteristics:
Hull has a flush deck,
an extended bulbous bow and small transom stern
Block coefficient (normal/deep): 0.631 / 0.636
Length to Beam Ratio: 5.85 : 1
'Natural speed' for length: 30.26 kts
Power going to wave formation at top speed: 46 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 32.81 ft / 10.00 m, 20.67 ft / 6.30 m
- Forward deck: 30.00 %, 20.67 ft / 6.30 m, 20.67 ft / 6.30 m
- Aft deck: 35.00 %, 20.67 ft / 6.30 m, 20.67 ft / 6.30 m
- Quarter deck: 15.00 %, 20.67 ft / 6.30 m, 20.67 ft / 6.30 m
- Average freeboard: 21.64 ft / 6.60 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 84.5 %
- Above water (accommodation/working, high = better): 142.9 %
Waterplane Area: 77,794 Square feet or 7,227 Square metres
Displacement factor (Displacement / loading): 109 %
Structure weight / hull surface area: 289 lbs/sq ft or 1,409 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.60
- Overall: 1.00
Adequate machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

[Raesene]

another small cruiser

**********

Pisa, Tuscan Kingdom cruiser laid down 1927

Displacement:
5.869 t light; 6.105 t standard; 7.192 t normal; 8.062 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(531,97 ft / 524,93 ft) x 49,21 ft x (18,04 / 19,68 ft)
(162,14 m / 160,00 m) x 15,00 m x (5,50 / 6,00 m)

Armament:
6 - 5,51" / 140 mm 45,0 cal guns - 88,18lbs / 40,00kg shells, 200 per gun
Dual purpose guns in deck and hoist mounts, 1927 Model
3 x Twin mounts on centreline ends, majority aft
1 raised mount aft - superfiring
12 - 1,57" / 40,0 mm 45,0 cal guns - 2,20lbs / 1,00kg shells, 500 per gun
Anti-air guns in deck mounts, 1923 Model
6 x Single mounts on sides, evenly spread
4 raised mounts
Weight of broadside 556 lbs / 252 kg
6 - 23,6" / 600 mm, 26,25 ft / 8,00 m torpedoes - 2,112 t each, 12,673 t total
In 2 sets of deck mounted side rotating tubes
6 - 23,6" / 600 mm, 26,25 ft / 8,00 m torpedoes - 2,112 t each, 12,673 t total
In 2 sets of deck mounted reloads

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1,57" / 40 mm 459,32 ft / 140,00 m 8,43 ft / 2,57 m
Ends: Unarmoured
Main Belt covers 135% of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,18" / 30 mm 1,18" / 30 mm -
2nd: 0,39" / 10 mm - -

- Box over machinery & magazines: 0,79" / 20 mm
Forecastle: 0,79" / 20 mm Quarter deck: 0,79" / 20 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 81.300 shp / 60.650 Kw = 34,00 kts
Range 5.000nm at 20,00 kts
Bunker at max displacement = 1.957 tons

Complement:
389 - 507

Cost:
£2,234 million / $8,934 million

Distribution of weights at normal displacement:
Armament: 147 tons, 2,0%
- Guns: 121 tons, 1,7%
- Torpedoes: 25 tons, 0,4%
Armour: 332 tons, 4,6%
- Belts: 238 tons, 3,3%
- Armament: 28 tons, 0,4%
- Armour Deck: 66 tons, 0,9%
Machinery: 2.566 tons, 35,7%
Hull, fittings & equipment: 2.699 tons, 37,5%
Fuel, ammunition & stores: 1.323 tons, 18,4%
Miscellaneous weights: 125 tons, 1,7%
- Hull below water: 25 tons
- Hull above water: 25 tons
- On freeboard deck: 50 tons
- Above deck: 25 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6.468 lbs / 2.934 Kg = 77,3 x 5,5 " / 140 mm shells or 1,0 torpedoes
Stability (Unstable if below 1.00): 1,24
Metacentric height 2,6 ft / 0,8 m
Roll period: 12,9 seconds
Steadiness - As gun platform (Average = 50 %): 57 %
- Recoil effect (Restricted arc if above 1.00): 0,28
Seaboat quality (Average = 1.00): 1,13

Hull form characteristics:
Hull has a flush deck,
a normal bow and large transom stern
Block coefficient (normal/deep): 0,540 / 0,555
Length to Beam Ratio: 10,67 : 1
'Natural speed' for length: 25,91 kts
Power going to wave formation at top speed: 63 %
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 (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20,00%, 26,25 ft / 8,00 m, 19,69 ft / 6,00 m
- Forward deck: 30,00%, 19,69 ft / 6,00 m, 19,69 ft / 6,00 m
- Aft deck: 35,00%, 19,69 ft / 6,00 m, 19,69 ft / 6,00 m
- Quarter deck: 15,00%, 19,69 ft / 6,00 m, 19,69 ft / 6,00 m
- Average freeboard: 20,21 ft / 6,16 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 123,3%
- Above water (accommodation/working, high = better): 167,1%
Waterplane Area: 18.591 Square feet or 1.727 Square metres
Displacement factor (Displacement / loading): 119%
Structure weight / hull surface area: 83 lbs/sq ft or 404 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,95
- Longitudinal: 2,11
- Overall: 1,02
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent

misc. weight for aircraft;
torpedo tubes may be removed for minelaying equipment

************

[RogueIce]

Farragut, United States Destroyer laid down 1926

Displacement:
1,713 t light; 1,800 t standard; 1,946 t normal; 2,062 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(402.21 ft / 380.00 ft) x 38.00 ft x (12.00 / 12.44 ft)
(122.59 m / 115.82 m) x 11.58 m x (3.66 / 3.79 m)

Armament:
8 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 150 per gun
Quick firing guns in deck and hoist mounts, 1926 Model
4 x Twin mounts on centreline ends, evenly spread
2 raised mounts - superfiring
24 - 1.57" / 40.0 mm 45.0 cal guns - 1.96lbs / 0.89kg shells, 300 per gun
Anti-air guns in deck mounts, 1926 Model
5 x Quad mounts on centreline, aft deck aft
1 raised mount - superfiring
1 x Quad mount on centreline, forward deck centre
1 double raised mount
8 - 0.50" / 12.7 mm 45.0 cal guns - 0.07lbs / 0.03kg shells, 500 per gun
Machine guns in deck mounts, 1926 Model
8 x Single mounts on sides, evenly spread
2 raised mounts
Weight of broadside 522 lbs / 237 kg
Main Torpedoes
8 - 21.0" / 533 mm, 16.00 ft / 4.88 m torpedoes - 1.090 t each, 8.722 t total
In 2 sets of deck mounted centre rotating tubes
2nd Torpedoes
8 - 21.0" / 533 mm, 20.00 ft / 6.10 m torpedoes - 1.327 t each, 10.615 t total
In 1 sets of deck mounted reloads
Main DC/AS Mortars
10 - 300.00 lbs / 136.08 kg Depth Charges + 1 reloads - 1.473 t total
in Stern depth charge racks
2nd DC/AS Mortars
8 - 300.00 lbs / 136.08 kg Depth Charges + 1 reloads - 1.205 t total
in Depth charge throwers

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

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 37,866 shp / 28,248 Kw = 34.00 kts
Range 2,500nm at 15.00 kts
Bunker at max displacement = 263 tons

Complement:
146 - 190

Cost:
£0.815 million / $3.261 million

Distribution of weights at normal displacement:
Armament: 131 tons, 6.8 %
- Guns: 97 tons, 5.0 %
- Weapons: 34 tons, 1.8 %
Armour: 10 tons, 0.5 %
- Armament: 10 tons, 0.5 %
Machinery: 962 tons, 49.5 %
Hull, fittings & equipment: 598 tons, 30.7 %
Fuel, ammunition & stores: 232 tons, 11.9 %
Miscellaneous weights: 11 tons, 0.6 %
- On freeboard deck: 11 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
513 lbs / 233 Kg = 8.2 x 5.0 " / 127 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 1.5 ft / 0.5 m
Roll period: 13.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.87
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has a flush deck,
a straight bulbous bow and large transom stern
Block coefficient (normal/deep): 0.393 / 0.402
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 22.57 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 68
Bow angle (Positive = bow angles forward): 35.00 degrees
Stern overhang: 4.00 ft / 1.22 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 26.00 ft / 7.92 m, 15.00 ft / 4.57 m
- Forward deck: 30.00 %, 15.00 ft / 4.57 m, 15.00 ft / 4.57 m
- Aft deck: 35.00 %, 15.00 ft / 4.57 m, 15.00 ft / 4.57 m
- Quarter deck: 15.00 %, 15.00 ft / 4.57 m, 15.00 ft / 4.57 m
- Average freeboard: 15.88 ft / 4.84 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 179.8 %
- Above water (accommodation/working, high = better): 142.2 %
Waterplane Area: 9,182 Square feet or 853 Square metres
Displacement factor (Displacement / loading): 69 %
Structure weight / hull surface area: 38 lbs/sq ft or 187 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.46
- Longitudinal: 1.73
- Overall: 0.53
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform

My 1926 series destroyer, presently building. How's it look?

[CmdrWilkens]

Farragut, United States Destroyer laid down 1926


Main DC/AS Mortars
10 - 300.00 lbs / 136.08 kg Depth Charges + 1 reloads - 1.473 t total
in Stern depth charge racks
2nd DC/AS Mortars
8 - 300.00 lbs / 136.08 kg Depth Charges + 1 reloads - 1.205 t total
in Depth charge throwers

My 1926 series destroyer, presently building. How's it look?

You have 10 depth charge racks and 8 throwers but only 2 charges per rack?

You probably can't fit more than 2 stern rails...but you should have a lot more reloads, you have (it appears) only about 36 total charges, which isn't enough for more than one pass and somewhere between 3 and 5 are really needed for a solid kill.

[Steve]

Proposal for my 1927 Naval Program's new "light cruiser":

Seattle, Cascadia Cruiser laid down 1927

Displacement:
10,189 t light; 10,678 t standard; 12,054 t normal; 13,154 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(622.27 ft / 610.00 ft) x 65.00 ft x (20.00 / 21.36 ft)
(189.67 m / 185.93 m) x 19.81 m x (6.10 / 6.51 m)

Armament:
9 - 8.00" / 203 mm 55.0 cal guns - 260.00lbs / 117.93kg shells, 150 per gun
Breech loading guns in turret on barbette mounts, 1927 Model
3 x Triple mounts on centreline ends, majority forward
1 raised mount - superfiring
8 - 5.00" / 127 mm 25.0 cal guns - 55.00lbs / 24.95kg shells, 200 per gun
Dual purpose guns in deck mounts, 1927 Model
8 x Single mounts on side ends, evenly spread
16 - 1.57" / 40.0 mm 40.0 cal guns - 1.87lbs / 0.85kg shells, 150 per gun
Anti-air guns in deck mounts, 1927 Model
4 x 2 row quad mounts on sides, evenly spread
16 - 1.00" / 25.4 mm 50.0 cal guns - 0.53lbs / 0.24kg shells, 150 per gun
Breech loading guns in deck mounts, 1927 Model
4 x 4 row quad mounts on side ends, evenly spread
4 raised mounts
Weight of broadside 2,818 lbs / 1,278 kg
Main Torpedoes
2 - 21.0" / 533 mm, 24.00 ft / 7.32 m torpedoes - 1.567 t each, 3.135 t total
In 3 sets of deck mounted carriage/fixed tubes
2nd Torpedoes
12 - 21.0" / 533 mm, 24.00 ft / 7.32 m torpedoes - 1.567 t each, 18.809 t total
In 1 sets of deck mounted reloads

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.25" / 108 mm 420.00 ft / 128.02 m 10.00 ft / 3.05 m
Ends: Unarmoured
Main Belt covers 106 % of normal length
Main Belt inclined 10.00 degrees (positive = in)

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.00" / 76 mm 2.00" / 51 mm 2.50" / 64 mm

- Armoured deck - multiple decks:
For and Aft decks: 2.00" / 51 mm
Forecastle: 1.00" / 25 mm Quarter deck: 1.50" / 38 mm

- Conning towers: Forward 1.50" / 38 mm, Aft 0.50" / 13 mm

Machinery:
Oil fired boilers, steam turbines,
Electric cruising motors plus geared drives, 4 shafts, 96,000 shp / 71,616 Kw = 33.18 kts
Range 8,500nm at 15.00 kts
Bunker at max displacement = 2,477 tons

Complement:
574 - 747

Cost:
£3.929 million / $15.717 million

Distribution of weights at normal displacement:
Armament: 765 tons, 6.3 %
- Guns: 738 tons, 6.1 %
- Weapons: 27 tons, 0.2 %
Armour: 1,975 tons, 16.4 %
- Belts: 734 tons, 6.1 %
- Armament: 235 tons, 2.0 %
- Armour Deck: 984 tons, 8.2 %
- Conning Towers: 23 tons, 0.2 %
Machinery: 3,030 tons, 25.1 %
Hull, fittings & equipment: 4,347 tons, 36.1 %
Fuel, ammunition & stores: 1,864 tons, 15.5 %
Miscellaneous weights: 72 tons, 0.6 %
- On freeboard deck: 72 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13,370 lbs / 6,065 Kg = 52.2 x 8.0 " / 203 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.22
Metacentric height 3.8 ft / 1.1 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 49 %
- Recoil effect (Restricted arc if above 1.00): 0.45
Seaboat quality (Average = 1.00): 0.88

Hull form characteristics:
Hull has a flush deck,
a normal bow and large transom stern
Block coefficient (normal/deep): 0.532 / 0.544
Length to Beam Ratio: 9.38 : 1
'Natural speed' for length: 28.22 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 10.00 ft / 3.05 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 26.00 ft / 7.92 m, 21.50 ft / 6.55 m
- Forward deck: 30.00 %, 21.50 ft / 6.55 m, 17.00 ft / 5.18 m
- Aft deck: 35.00 %, 17.00 ft / 5.18 m, 17.00 ft / 5.18 m
- Quarter deck: 15.00 %, 17.00 ft / 5.18 m, 17.00 ft / 5.18 m
- Average freeboard: 18.94 ft / 5.77 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 104.7 %
- Above water (accommodation/working, high = better): 163.2 %
Waterplane Area: 28,316 Square feet or 2,631 Square metres
Displacement factor (Displacement / loading): 110 %
Structure weight / hull surface area: 114 lbs/sq ft or 554 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.21
- Overall: 1.00
Adequate machinery, storage, compartmentation space
Excellent accommodation and workspace room
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

2 Scout Aircraft Included

Yeah, I know, poor seaboat. Of course, it's only because of the speed. Given most historical designs had similar dimensions and speed capability, you'll understand if I'm not too worried about what SpringSharp claims.

Note that they're intended to be Light Cruisers.

[RogueIce]

You have 10 depth charge racks and 8 throwers but only 2 charges per rack?

You probably can't fit more than 2 stern rails...but you should have a lot more reloads, you have (it appears) only about 36 total charges, which isn't enough for more than one pass and somewhere between 3 and 5 are really needed for a solid kill.

Um...no? Well ok, that's what it says but it's certainly not the intent. I just have no idea how the thing works. Any help would be hugely appreciated.

BTW, those deck and hoist mounts for guns...those are turrets, right?

[Steve]

You mean like this?? No. They're open mounts but they have their own hoist mechanism coming up from a secondary magazine which can be armored.

[Beowulf]

You mean like this?? No. They're open mounts but they have their own hoist mechanism coming up from a secondary magazine which can be armored.

Um... I thought they can be either open or closed mounts. The secondary armament on a Iowa certainly doesn't have a barbette, and they are closed in and armored. The hoist part means that each gunhouse gets it's own hoist from the magazine. The gunhouses aren't mounted on barbettes, however, which means that the gunhouses can't be as heavy, and that the armored section leading up from the magazine to the barbette is almost certainly not going to be strong enough to support the gunhouse.

[RogueIce]

So how do you do turrets for a DD? Do you have to select the turret w/barbette mount and just stick like half an inch of armor on it or something?

[Steve]

Hrm, Beo's right apparently.

[RogueIce]

Hrm, Beo's right apparently.

So "deck and hoist" is good for DD type turrets?

[Steve]

Hrm, Beo's right apparently.

So "deck and hoist" is good for DD type turrets?

it can be used for them, yes. Apparently being deck and hoist doesn't preclude covered gunhouses.

[CmdrWilkens]

You have 10 depth charge racks and 8 throwers but only 2 charges per rack?

You probably can't fit more than 2 stern rails...but you should have a lot more reloads, you have (it appears) only about 36 total charges, which isn't enough for more than one pass and somewhere between 3 and 5 are really needed for a solid kill.

Um...no? Well ok, that's what it says but it's certainly not the intent. I just have no idea how the thing works. Any help would be hugely appreciated.

BTW, those deck and hoist mounts for guns...those are turrets, right?

What I went with on my 1926/7 series Cruisers, Destroyers, and Frigates has 2 charges with 50 (or 40/30 depending) reloads in stern rails and 2 charges with 40 (or 30/ 20) reloads in depth charge throwers. That gives you two stern rails and (probably) 2 Y- of K- throwers...of course if this were the Californian Navy they would have no rails just K- and Y- to launch their charges

Anyway here is what it looks like on my San Juan class:

Main DC/AS Mortars

• 2 - 450.00 lbs / 204.12 kg Depth Charges + 50 reloads - 10.446 t total
  • in Stern depth charge racks

2nd DC/AS Mortars

• 2 - 450.00 lbs / 204.12 kg Depth Charges + 20 reloads - 4.420 t total
  • in Depth charge throwers

On the larger question of ASW effectiveness I've been using NavWeaps as my primary resource and the link sends you to a decent 5 or so paragraph primer on the subject before getting in to the US ASW arsenal.