SDN World 3 Ship Design Thread

[Beowulf]

One thing I'm not getting, especially given what SeaSkimmer said; increasing the top speed has incredibly negative effects on seaworthiness of the boat, even if the cruising speed remains the same. What's causing this?

More speed requires much bigger engines, which weigh more. More weight means less seaworthiness. My planned Large Armored Cruiser takes about 9 times more power to go 31 knots than 16 knots. 9 times more power is 9 times the weight. See the problem?

[Ryan Thunder]

One thing I'm not getting, especially given what SeaSkimmer said; increasing the top speed has incredibly negative effects on seaworthiness of the boat, even if the cruising speed remains the same. What's causing this?

More speed requires much bigger engines, which weigh more. More weight means less seaworthiness. My planned Large Armored Cruiser takes about 9 times more power to go 31 knots than 16 knots. 9 times more power is 9 times the weight. See the problem?

Yeah, alright. Makes sense.

[Steve]

Eh, forget about it, the ships will be obsolete within ten years of laying anyway given advances in various things like armor and eventually the new smokeless powder, at least from what I've heard, and the only thing of note they'll do is blow up some lighter cruisers. The flaw of reduced protection to get both a larger and heavier engine plant and the battleship-grade main battery will even result in one being lost to a few hits that disable - with reduced coal stores due to lack of replenishment before the battle - and then a torpedo.

I was only listing it out because they'll appear a time or two, particularly in my opening post. And I did the Reprisal mostly out of curiosity to see what two years later would've gotten me.

I think I'll go back to designing dreadnoughts. Got one for 1905 and 1907 (or '08, can't remember), now time to do one to be laid in 1911 or so).

[K. A. Pital]

Destroyers (post-1913)!

Pre-1913 ones will take some time, most of them are below 1000 ton obsoletes, although some pack a decent punch in their 700-600 tons...

[Sea Skimmer]

Right. Which would affect seaworthiness *at top speed*. But if the ship isn't normally going that fast it will still be able to slog through heavy weather, right?

It should still slog through bad weather, but ships can take serious damage from that none the less. Deck plating can be smashed in, water can get into the magazines, and in the worst case scenario enough water breaks over the deck that it goes down the ventilators and snuffs out the boiler fires. This directly led to the loss of USS Memphis in 1916. No boilers means no propulsion, which means you can’t turn into the waves and you cant pump water back over the side except with manual pumps. Ships of the 1920s didn’t have backup diesels to provide power for that yet.

If you are close to land, things can be very bad very quick and the ship may be driven onto the rocks. A number of large warships including a French dreadnought were lost to storms in the 1910s and 20s so this is no minor issue. Weather reporting at the time was very primitive and hurricanes could still literally strike without warning.

Poor seaworthiness can also make ships guns very difficult to keep dry and in action even in relatively good weather. Its also bad for moral and the health and living standards of the crew. But all this said, many real life ships had serious seaworthiness problems and performance well enough for it. Particularly any ship which had gun casemates in the hull was going to have problems with them being too wet. The USN ended up rebuilding some of its dreadnoughts in the end to move the entire secondary battery from the hull into the superstructure.

[Steve]

I'm probably going to get thwacked for this pre-dread design. I was just having fun honestly....

Sovereign, Cascadian Battleship laid down 1899

Displacement:
16,090 t light; 17,105 t standard; 18,739 t normal; 20,046 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(489.57 ft / 480.00 ft) x 80.00 ft x (28.00 / 29.61 ft)
(149.22 m / 146.30 m) x 24.38 m x (8.53 / 9.03 m)

Armament:
6 - 12.00" / 305 mm 45.0 cal guns - 871.00lbs / 395.08kg shells, 150 per gun
Breech loading guns in turret on barbette mounts, 1898 Model
3 x 2-gun mounts on centreline ends, majority forward
1 raised mount - superfiring
6 - 9.00" / 229 mm 45.0 cal guns - 368.00lbs / 166.92kg shells, 150 per gun
Breech loading guns in casemate mounts, 1896 Model
6 x Single mounts on sides, evenly spread
18 - 3.00" / 76.2 mm 45.0 cal guns - 14.00lbs / 6.35kg shells, 150 per gun
Quick firing guns in deck and hoist mounts, 1895 Model
14 x Single mounts on sides, evenly spread
6 raised mounts
4 x Single mounts on side ends, evenly spread
4 double raised mounts
Weight of broadside 7,686 lbs / 3,486 kg
Main Torpedoes
12 - 18.0" / 457 mm, 16.00 ft / 4.88 m torpedoes - 0.563 t each, 6.752 t total
submerged side tubes
2nd Torpedoes
10 - 18.0" / 457 mm, 16.00 ft / 4.88 m torpedoes - 0.563 t each, 5.627 t total
In 1 sets of deck mounted carriage/fixed tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 10.0" / 254 mm 316.00 ft / 96.32 m 12.00 ft / 3.66 m
Ends: 8.00" / 203 mm 164.00 ft / 49.99 m 12.00 ft / 3.66 m
Upper: 7.00" / 178 mm 316.00 ft / 96.32 m 10.00 ft / 3.05 m
Main Belt covers 101 % of normal length

- Torpedo Bulkhead - Additional damage containing bulkheads:
3.00" / 76 mm 321.00 ft / 97.84 m 26.00 ft / 7.92 m
Beam between torpedo bulkheads 65.00 ft / 19.81 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 7.00" / 178 mm - 6.00" / 152 mm
2nd: 6.00" / 152 mm - -

- Armoured deck - multiple decks:
For and Aft decks: 4.00" / 102 mm
Forecastle: 2.50" / 64 mm Quarter deck: 2.50" / 64 mm

- Conning towers: Forward 11.00" / 279 mm, Aft 3.00" / 76 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 15,498 ihp / 11,561 Kw = 18.00 kts
Range 8,000nm at 10.00 kts
Bunker at max displacement = 2,941 tons (100% coal)

Complement:
800 - 1,041

Cost:
£1.523 million / $6.094 million

Distribution of weights at normal displacement:
Armament: 1,551 tons, 8.3 %
- Guns: 1,531 tons, 8.2 %
- Weapons: 21 tons, 0.1 %
Armour: 6,983 tons, 37.3 %
- Belts: 3,226 tons, 17.2 %
- Torpedo bulkhead: 926 tons, 4.9 %
- Armament: 651 tons, 3.5 %
- Armour Deck: 1,967 tons, 10.5 %
- Conning Towers: 213 tons, 1.1 %
Machinery: 2,460 tons, 13.1 %
Hull, fittings & equipment: 5,096 tons, 27.2 %
Fuel, ammunition & stores: 2,649 tons, 14.1 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
25,037 lbs / 11,357 Kg = 29.0 x 12.0 " / 305 mm shells or 9.9 torpedoes
Stability (Unstable if below 1.00): 1.29
Metacentric height 5.6 ft / 1.7 m
Roll period: 14.2 seconds
Steadiness - As gun platform (Average = 50 %): 86 %
- Recoil effect (Restricted arc if above 1.00): 0.67
Seaboat quality (Average = 1.00): 1.71

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.610 / 0.617
Length to Beam Ratio: 6.00 : 1
'Natural speed' for length: 21.91 kts
Power going to wave formation at top speed: 42 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 8.00 ft / 2.44 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 18.00 ft / 5.49 m, 18.00 ft / 5.49 m
- Forward deck: 30.00 %, 18.00 ft / 5.49 m, 18.00 ft / 5.49 m
- Aft deck: 35.00 %, 18.00 ft / 5.49 m, 18.00 ft / 5.49 m
- Quarter deck: 15.00 %, 18.00 ft / 5.49 m, 18.00 ft / 5.49 m
- Average freeboard: 18.00 ft / 5.49 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 92.6 %
- Above water (accommodation/working, high = better): 120.5 %
Waterplane Area: 28,348 Square feet or 2,634 Square metres
Displacement factor (Displacement / loading): 105 %
Structure weight / hull surface area: 144 lbs/sq ft or 701 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 1.96
- Overall: 1.00
Adequate 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

[Sea Skimmer]

No one will out gun Siam or whatever I decide to rename it. . Note that 70% of length is armored all the way to the main deck all on scale greater then Yamato. Speed will become all the more irrelevant when I introduce the 5,000lb superheavies. Torpedo bulkhead tapers from 7in at the top to 1.5in at the bottom for reasons known only to Siam.

Legend of Suriyothai , Siam Central Citadel Coastal Defence Ship laid down 1925

Displacement:
57,315 t light; 59,981 t standard; 61,477 t normal; 62,673 t full load

Dimensions: Length overall / water x beam x draught
727.25 ft / 725.00 ft x 160.00 ft x 27.00 ft (normal load)
221.67 m / 220.98 m x 48.77 m x 8.23 m

Armament:
6 - 18.90" / 480 mm guns (3x2 guns), 3,900.00lbs / 1,769.01kg shells, 1925 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward
24 - 5.51" / 140 mm guns (12x2 guns), 83.72lbs / 37.98kg shells, 1925 Model
Dual purpose guns in deck mounts with hoists
on side, evenly spread, 4 raised mounts
32 - 1.38" / 35.0 mm guns (16x2 guns), 1.31lbs / 0.59kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
32 - 0.70" / 17.8 mm guns (16x2 guns), 0.17lbs / 0.08kg shells, 1925 Model
Breech loading guns in deck mounts
on side, evenly spread, 8 raised mounts
Weight of broadside 25,457 lbs / 11,547 kg
Shells per gun, main battery: 100

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 17.0" / 432 mm 500.00 ft / 152.40 m 20.00 ft / 6.10 m
Ends: 1.25" / 32 mm 225.00 ft / 68.58 m 11.00 ft / 3.35 m
Main Belt covers 106 % of normal length

- Torpedo Bulkhead:
4.00" / 102 mm 500.00 ft / 152.40 m 27.00 ft / 8.23 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 25.0" / 635 mm 14.0" / 356 mm 20.0" / 508 mm
2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm
3rd: 1.00" / 25 mm - -

- Armour deck: 9.00" / 229 mm, Conning tower: 8.00" / 203 mm

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 42,604 shp / 31,783 Kw = 20.00 kts
Range 5,000nm at 12.00 kts
Bunker at max displacement = 2,693 tons

Complement:
1,951 - 2,537

Cost:
£14.863 million / $59.452 million

Distribution of weights at normal displacement:
Armament: 2,788 tons, 4.5 %
Armour: 30,230 tons, 49.2 %
- Belts: 7,787 tons, 12.7 %
- Torpedo bulkhead: 1,998 tons, 3.3 %
- Armament: 4,202 tons, 6.8 %
- Armour Deck: 15,975 tons, 26.0 %
- Conning Tower: 268 tons, 0.4 %
Machinery: 1,383 tons, 2.3 %
Hull, fittings & equipment: 22,763 tons, 37.0 %
Fuel, ammunition & stores: 4,162 tons, 6.8 %
Miscellaneous weights: 150 tons, 0.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
155,830 lbs / 70,683 Kg = 46.2 x 18.9 " / 480 mm shells or 48.4 torpedoes
Stability (Unstable if below 1.00): 1.63
Metacentric height 22.9 ft / 7.0 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 43 %
- Recoil effect (Restricted arc if above 1.00): 0.09
Seaboat quality (Average = 1.00): 0.83

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.687
Length to Beam Ratio: 4.53 : 1
'Natural speed' for length: 32.28 kts
Power going to wave formation at top speed: 39 %
Trim (Max stability = 0, Max steadiness = 100): 44
Bow angle (Positive = bow angles forward): 8.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.00 ft / 4.88 m
- Forecastle (0 %): 16.00 ft / 4.88 m
- Mid (50 %): 16.00 ft / 4.88 m
- Quarterdeck (0 %): 16.00 ft / 4.88 m
- Stern: 16.00 ft / 4.88 m
- Average freeboard: 16.00 ft / 4.88 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 49.1 %
- Above water (accommodation/working, high = better): 149.9 %
Waterplane Area: 95,946 Square feet or 8,914 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 220 lbs/sq ft or 1,073 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.01
- Longitudinal: 0.99
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[Steve]

Aaack, fucking thing! How can my hull have too much armor when I haven't put it on yet?!?! Hell, why does it do this when I try to add a single god damn gun?!

[K. A. Pital]

The general composition of my destroyer fleet is 45 good by late-WWI measure (relatively modern) destroyers and 90 old (pre-WWI and even pre-RJW) destroyers, a total of 135 destroyers. The older shit is my coastal destroyers to protect the Baltic and the like.

There's a total of 177 surface combatants (excluding minelayers and minesweepers, glorified patrol boats) in the RKKF, most in good condition despite obsoletion, since they didn't see much action outside of the Russo-Polish war 1917-1920 and preventive mining in 1914-1915.

Also, smaller nations of Europe (if there are such) are welcome to shop for c.1907 project destroyers which I will be scrapping after assuming power. They can serve until 1929 perhaps in your navies (kinda like Finland bought a few oldies from the USSR and kept them seaworthy until 1930 IIRC).

Now just to see what my submarine park looks like *goes into digging*

RKKF 1925 - surface (WIP)

[Ma Deuce]

Speed will become all the more irrelevant when I introduce the 5,000lb superheavies.

I suspect deck armor will become irrelevant as well with 5,000lb shells in 18.9 in guns.

[Fingolfin_Noldor]

Might as well create a floating barge with huge big guns.......

[Mr Bean]

Speed will become all the more irrelevant when I introduce the 5,000lb superheavies.

I suspect deck armor will become irrelevant as well with 5,000lb shells in 18.9 in guns.

Indeed. However ... Coastal defense ship?
Carrying that much armor and those guns? How is a coastal defense ship? With that size it's draft should be monstrous, coming anywhere NEAR the coast should beach the thing easily.

[Fingolfin_Noldor]

Speed will become all the more irrelevant when I introduce the 5,000lb superheavies.

I suspect deck armor will become irrelevant as well with 5,000lb shells in 18.9 in guns.

Indeed. However ... Coastal defense ship?
Carrying that much armor and those guns? How is a coastal defense ship? With that size it's draft should be monstrous, coming anywhere NEAR the coast should beach the thing easily.

Ship's draught according the stats seems to be about 8m.

[Ma Deuce]

Carrying that much armor and those guns? How is a coastal defense ship? With that size it's draft should be monstrous, coming anywhere NEAR the coast should beach the thing easily.

It's draft is 27 feet; pretty deep for a "coastal defense ship", but quite shallow for a vessel of that displacement: also notice the monstrous beam and block coefficient.

[Norade]

The Updated Cidade-class for your viewing pleasure.

Cidade classe 1920, Portugal Cruiser laid down 1920

Displacement:
26,134 t light; 27,995 t standard; 31,960 t normal; 35,132 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(601.74 ft / 574.15 ft) x 82.02 ft x (32.81 / 35.69 ft)
(183.41 m / 175.00 m) x 25.00 m x (10.00 / 10.88 m)

Armament:
8 - 15.00" / 381 mm 40.0 cal guns - 1,617.32lbs / 733.60kg shells, 120 per gun
Breech loading guns in turret on barbette mounts, 1920 Model
1 x Quad mount on centreline, forward evenly spread
1 x Quad mount on centreline, aft evenly spread
8 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 250 per gun
Quick firing guns in turret on barbette mounts, 1920 Model
4 x Triple mounts on sides, evenly spread
12 - 4.00" / 102 mm 50.0 cal guns - 33.88lbs / 15.37kg shells, 1,000 per gun
Quick firing guns in deck mounts, 1920 Model
6 x 2 row twin mounts on sides, evenly spread
6 raised mounts
Weight of broadside 14,260 lbs / 6,468 kg
4 - 24.0" / 610 mm, 18.00 ft / 5.49 m torpedoes - 1.510 t each, 6.042 t total
In 2 sets of deck mounted centre rotating tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 18.0" / 457 mm 464.49 ft / 141.58 m 13.00 ft / 3.96 m
Ends: 3.00" / 76 mm 109.64 ft / 33.42 m 11.50 ft / 3.51 m
Upper: 3.00" / 76 mm 344.49 ft / 105.00 m 8.00 ft / 2.44 m
Main Belt covers 124 % of normal length

- Torpedo Bulkhead:
4.00" / 102 mm 344.49 ft / 105.00 m 30.62 ft / 9.33 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 18.0" / 457 mm 15.0" / 381 mm 16.0" / 406 mm
2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm
3rd: 1.50" / 38 mm 1.50" / 38 mm -

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

- Conning towers: Forward 15.00" / 381 mm, Aft 0.00" / 0 mm

Machinery:
Coal fired boilers, steam turbines,
Geared drive, 4 shafts, 44,610 shp / 33,279 Kw = 22.00 kts
Range 6,200nm at 18.00 kts
Bunker at max displacement = 7,137 tons (100% coal)

Complement:
1,194 - 1,553

Cost:
£5.543 million / $22.171 million

Distribution of weights at normal displacement:
Armament: 2,227 tons, 7.0 %
- Guns: 2,221 tons, 6.9 %
- Torpedoes: 6 tons, 0.0 %
Armour: 13,067 tons, 40.9 %
- Belts: 5,055 tons, 15.8 %
- Torpedo bulkhead: 1,561 tons, 4.9 %
- Armament: 2,864 tons, 9.0 %
- Armour Deck: 3,261 tons, 10.2 %
- Conning Tower: 325 tons, 1.0 %
Machinery: 1,716 tons, 5.4 %
Hull, fittings & equipment: 9,125 tons, 28.6 %
Fuel, ammunition & stores: 5,825 tons, 18.2 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
54,442 lbs / 24,694 Kg = 32.3 x 15.0 " / 381 mm shells or 9.8 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 4.8 ft / 1.5 m
Roll period: 15.7 seconds
Steadiness - As gun platform (Average = 50 %): 63 %
- Recoil effect (Restricted arc if above 1.00): 0.99
Seaboat quality (Average = 1.00): 1.45

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.724 / 0.732
Length to Beam Ratio: 7.00 : 1
'Natural speed' for length: 23.96 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 43
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 22.97 ft / 7.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 26.25 ft / 8.00 m, 22.97 ft / 7.00 m
- Forward deck: 30.00 %, 22.97 ft / 7.00 m, 19.69 ft / 6.00 m
- Aft deck: 30.00 %, 19.69 ft / 6.00 m, 19.69 ft / 6.00 m
- Quarter deck: 20.00 %, 19.69 ft / 6.00 m, 16.40 ft / 5.00 m
- Average freeboard: 20.77 ft / 6.33 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 70.7 %
- Above water (accommodation/working, high = better): 116.2 %
Waterplane Area: 38,556 Square feet or 3,582 Square metres
Displacement factor (Displacement / loading): 115 %
Structure weight / hull surface area: 173 lbs/sq ft or 845 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 1.98
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily

[Fingolfin_Noldor]

It isn't advisable to go with quad mounts with main guns. The complexity is rather great, and the King George V class was notorious for jams and problems.

[Norade]

That is very true, but the British basically screwed up their design in that case going too fast in building their guns and not doing a good job. This isn't a case of quad mounts being bad just a poor design by the Brits. My main worry is that this design will mean that I lose all of my firepower to potentialy fewer shots.

[Ma Deuce]

It isn't advisable to go with quad mounts with main guns. The complexity is rather great, and the King George V class was notorious for jams and problems.

I don't recall such problems in the Richelieu or Dunkerque-classes, so reliable 4-gun mounts are quite doable, at least by the '30s. However, there's still the very real danger of "putting too many eggs in one basket", and this is an issue even if the mount isn't destroyed: A solid non-penetrating hit on the barbette can jam the turret in train, effectively removing it from play. This is exactly what happened to Jean Bart at Casablanca.

[Norade]

I just figured that I'd try going with eight heavier guns in two quad mounts rather than the nine guns in three triple mounts that are more common. It saves a lot of weight and has favorable trade offs as far as I'm concerned.

[K. A. Pital]

Might as well create a floating barge with huge big guns.......

Or just do nothing, take a few ships nearing obsoletion and convert them to floating batteries...

[Norseman]

I have made designs for each class of Brazilian battleship, problem is that I now have nine classes around (though the 1923 ships won't be ready before 1926, and I'm just laying down the 1925 design). I'm not sure if anyone really want to see each of the ships and hear my somewhat flimsy explanation as to why they were made as they were. On the other hand I really do want feedback so... :-/

[Norade]

What's the harm in posting your designs? The worst that happens is you get little response. But I'd suggest posting the designs you most desire feedback on and working from there.

[Norseman]

Since we're now using Standard Tonnage to decide how heavy our ships can be here is my remade export battleship, please tell me if you see any serious defects here.

Code: Select all

International Solidarity, FSR of Brazil Battleship laid down 1920

Displacement:
	28,380 t light; 29,943 t standard; 31,228 t normal; 32,256 t full load

Dimensions: Length overall / water x beam x draught
	665.21 ft / 650.00 ft x 95.00 ft x 30.00 ft (normal load)
	202.75 m / 198.12 m x 28.96 m  x 9.14 m

Armament:
      9 - 15.00" / 381 mm guns (3x3 guns), 1,687.50lbs / 765.44kg shells, 1918 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, majority forward
      12 - 6.00" / 152 mm guns (6x2 guns), 108.00lbs / 48.99kg shells, 1905 Model
	  Breech loading guns in deck mounts with hoists
	  on side, all amidships
      8 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1915 Model
	  Anti-aircraft guns in deck mounts with hoists
	  on side, evenly spread
      16 - 1.57" / 40.0 mm guns (8x2 guns), 1.95lbs / 0.89kg shells, 1915 Model
	  Anti-aircraft guns in deck mounts 
	  on side, evenly spread
      16 - 0.50" / 12.7 mm guns (8x2 guns), 0.06lbs / 0.03kg shells, 1920 Model
	  Machine guns in deck mounts 
	  on side, evenly spread
	Weight of broadside 16,624 lbs / 7,540 kg
	Shells per gun, main battery: 100
	2 - 24.5" / 622.3 mm submerged torpedo tubes

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	13.5" / 343 mm	370.00 ft / 112.78 m	16.00 ft / 4.88 m
	Ends:	Unarmoured
	  Main Belt covers 88 % of normal length

   - Torpedo Bulkhead:
		3.00" / 76 mm	650.00 ft / 198.12 m	25.00 ft / 7.62 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	15.0" / 381 mm	9.00" / 229 mm		10.0" / 254 mm
	2nd:	1.50" / 38 mm	1.00" / 25 mm		1.00" / 25 mm
	3rd:	      -		      -			1.00" / 25 mm

   - Armour deck: 6.00" / 152 mm, Conning tower: 13.00" / 330 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 2 shafts, 46,471 shp / 34,667 Kw = 22.72 kts
	Range 7,000nm at 12.00 kts
	Bunker at max displacement = 2,313 tons

Complement:
	1,173 - 1,526

Cost:
	£7.011 million / $28.045 million

Distribution of weights at normal displacement:
	Armament: 2,078 tons, 6.7 %
	Armour: 12,871 tons, 41.2 %
	   - Belts: 3,573 tons, 11.4 %
	   - Torpedo bulkhead: 1,804 tons, 5.8 %
	   - Armament: 2,250 tons, 7.2 %
	   - Armour Deck: 4,966 tons, 15.9 %
	   - Conning Tower: 278 tons, 0.9 %
	Machinery: 1,625 tons, 5.2 %
	Hull, fittings & equipment: 11,731 tons, 37.6 %
	Fuel, ammunition & stores: 2,848 tons, 9.1 %
	Miscellaneous weights: 75 tons, 0.2 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  42,539 lbs / 19,296 Kg = 25.2 x 15.0 " / 381 mm shells or 7.7 torpedoes
	Stability (Unstable if below 1.00): 1.14
	Metacentric height 5.9 ft / 1.8 m
	Roll period: 16.4 seconds
	Steadiness	- As gun platform (Average = 50 %): 71 %
			- Recoil effect (Restricted arc if above 1.00): 0.73
	Seaboat quality  (Average = 1.00): 1.46

Hull form characteristics:
	Hull has raised forecastle
	Block coefficient: 0.590
	Length to Beam Ratio: 6.84 : 1
	'Natural speed' for length: 25.50 kts
	Power going to wave formation at top speed: 44 %
	Trim (Max stability = 0, Max steadiness = 100): 49
	Bow angle (Positive = bow angles forward): 20.00 degrees
	Stern overhang: 5.00 ft / 1.52 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		28.04 ft / 8.55 m
	   - Forecastle (18 %):	22.00 ft / 6.71 m (20.00 ft / 6.10 m aft of break)
	   - Mid (50 %):		17.85 ft / 5.44 m
	   - Quarterdeck (18 %):	17.85 ft / 5.44 m
	   - Stern:		17.85 ft / 5.44 m
	   - Average freeboard:	19.35 ft / 5.90 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 86.9 %
		- Above water (accommodation/working, high = better): 133.6 %
	Waterplane Area: 44,742 Square feet or 4,157 Square metres
	Displacement factor (Displacement / loading): 95 %
	Structure weight / hull surface area: 188 lbs/sq ft or 920 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.96
		- Longitudinal: 1.48
		- 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

[Sea Skimmer]

Indeed. However ... Coastal defense ship?
Carrying that much armor and those guns? How is a coastal defense ship? With that size it's draft should be monstrous, coming anywhere NEAR the coast should beach the thing easily.

It defends the coast by denying the entire Gulf of Thailand to the enemy. Should the enemy come in overwhelming strength and survive it and the torpedo-minelayer cruisers it falls back to the mine-artillery positions outside of Bangkok and forms a central battery. 60,000 tons being a not ideal limit, I find it impossible to create a satisfactory 18in ship so if I’m going to be slow, I’m going to outgun anything that could physically appear. My plans for a ship with a very large number of guns just don't work without somewhat more tonnage.

Might as well create a floating barge with huge big guns.......

Italy had a rectangular monitor with two 15in guns armored with concrete in WW1. However while a monitor might match my 48cm main battery in caliber, it will never mount enough guns to range on a moving target, nor is it likely to survive my torpedo craft counter attacking. Meanwhile my ship is essentially immune to torpedo attacks and I may specify bow shafts to make it harder to disable. Anyway I don't intend to build more then two of these, if that. But the barrels will also be going into land batteries.

[Thanas]

No one will out gun Siam or whatever I decide to rename it. . Note that 70% of length is armored all the way to the main deck all on scale greater then Yamato. Speed will become all the more irrelevant when I introduce the 5,000lb superheavies. Torpedo bulkhead tapers from 7in at the top to 1.5in at the bottom for reasons known only to Siam.

Legend of Suriyothai , Siam Central Citadel Coastal Defence Ship laid down 1925

Displacement:
57,315 t light; 59,981 t standard; 61,477 t normal; 62,673 t full load

Dimensions: Length overall / water x beam x draught
727.25 ft / 725.00 ft x 160.00 ft x 27.00 ft (normal load)
221.67 m / 220.98 m x 48.77 m x 8.23 m

Armament:
6 - 18.90" / 480 mm guns (3x2 guns), 3,900.00lbs / 1,769.01kg shells, 1925 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward
24 - 5.51" / 140 mm guns (12x2 guns), 83.72lbs / 37.98kg shells, 1925 Model
Dual purpose guns in deck mounts with hoists
on side, evenly spread, 4 raised mounts
32 - 1.38" / 35.0 mm guns (16x2 guns), 1.31lbs / 0.59kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
32 - 0.70" / 17.8 mm guns (16x2 guns), 0.17lbs / 0.08kg shells, 1925 Model
Breech loading guns in deck mounts
on side, evenly spread, 8 raised mounts
Weight of broadside 25,457 lbs / 11,547 kg
Shells per gun, main battery: 100

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 17.0" / 432 mm 500.00 ft / 152.40 m 20.00 ft / 6.10 m
Ends: 1.25" / 32 mm 225.00 ft / 68.58 m 11.00 ft / 3.35 m
Main Belt covers 106 % of normal length

- Torpedo Bulkhead:
4.00" / 102 mm 500.00 ft / 152.40 m 27.00 ft / 8.23 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 25.0" / 635 mm 14.0" / 356 mm 20.0" / 508 mm
2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm
3rd: 1.00" / 25 mm - -

- Armour deck: 9.00" / 229 mm, Conning tower: 8.00" / 203 mm

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 42,604 shp / 31,783 Kw = 20.00 kts
Range 5,000nm at 12.00 kts
Bunker at max displacement = 2,693 tons

Complement:
1,951 - 2,537

Cost:
£14.863 million / $59.452 million

Distribution of weights at normal displacement:
Armament: 2,788 tons, 4.5 %
Armour: 30,230 tons, 49.2 %
- Belts: 7,787 tons, 12.7 %
- Torpedo bulkhead: 1,998 tons, 3.3 %
- Armament: 4,202 tons, 6.8 %
- Armour Deck: 15,975 tons, 26.0 %
- Conning Tower: 268 tons, 0.4 %
Machinery: 1,383 tons, 2.3 %
Hull, fittings & equipment: 22,763 tons, 37.0 %
Fuel, ammunition & stores: 4,162 tons, 6.8 %
Miscellaneous weights: 150 tons, 0.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
155,830 lbs / 70,683 Kg = 46.2 x 18.9 " / 480 mm shells or 48.4 torpedoes
Stability (Unstable if below 1.00): 1.63
Metacentric height 22.9 ft / 7.0 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 43 %
- Recoil effect (Restricted arc if above 1.00): 0.09
Seaboat quality (Average = 1.00): 0.83

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.687
Length to Beam Ratio: 4.53 : 1
'Natural speed' for length: 32.28 kts
Power going to wave formation at top speed: 39 %
Trim (Max stability = 0, Max steadiness = 100): 44
Bow angle (Positive = bow angles forward): 8.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.00 ft / 4.88 m
- Forecastle (0 %): 16.00 ft / 4.88 m
- Mid (50 %): 16.00 ft / 4.88 m
- Quarterdeck (0 %): 16.00 ft / 4.88 m
- Stern: 16.00 ft / 4.88 m
- Average freeboard: 16.00 ft / 4.88 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 49.1 %
- Above water (accommodation/working, high = better): 149.9 %
Waterplane Area: 95,946 Square feet or 8,914 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 220 lbs/sq ft or 1,073 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.01
- Longitudinal: 0.99
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Skimmer, what version of Springsharp are you using? Because I have been trying to replicate this design, and I always get a structural integrity below 1.00 - 0,98 to be exact? .