Shipbucket

Gwangmu, KJH Battleship laid down 1938

Displacement:
43,124 t light; 45,720 t standard; 48,383 t normal; 50,513 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(797.55 ft / 772.64 ft) x 118.11 ft x (33.14 / 34.30 ft)
(243.09 m / 235.50 m) x 36.00 m x (10.10 / 10.45 m)

Armament:
10 - 15.75" / 400 mm 45.0 cal guns - 1,969.41lbs / 893.31kg shells, 120 per gun
Breech loading guns in turret on barbette mounts, 1938 Model
2 x 3-gun mounts on centreline ends, evenly spread
2 x 2-gun mounts on centreline ends, evenly spread
2 raised mounts
20 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 450 per gun
Dual purpose guns in turret on barbette mounts, 1938 Model
6 x Twin mounts on sides forward
4 x Twin mounts on side ends, evenly spread
4 raised mounts
Weight of broadside 20,955 lbs / 9,505 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 16.1" / 410 mm 414.21 ft / 126.25 m 12.50 ft / 3.81 m
Ends: 5.91" / 150 mm 59.06 ft / 18.00 m 12.50 ft / 3.81 m
299.38 ft / 91.25 m Unarmoured ends
Upper: 5.91" / 150 mm 414.21 ft / 126.25 m 8.01 ft / 2.44 m
Main Belt covers 82 % of normal length

- Torpedo Bulkhead:
2.36" / 60 mm 414.21 ft / 126.25 m 32.15 ft / 9.80 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 18.0" / 457 mm 10.0" / 254 mm 13.0" / 330 mm
2nd: 0.75" / 19 mm 0.75" / 19 mm 1.77" / 45 mm

- Armoured deck - multiple decks: 7.09" / 180 mm For and Aft decks

- Conning towers: Forward 18.11" / 460 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 125,216 shp / 93,411 Kw = 27.80 kts
Range 7,200nm at 16.00 kts
Bunker at max displacement = 4,793 tons

Complement:
1,630 - 2,120

Cost:
£22.236 million / $88.944 million

Distribution of weights at normal displacement:
Armament: 4,229 tons, 8.7 %
Armour: 17,217 tons, 35.6 %
- Belts: 4,845 tons, 10.0 %
- Torpedo bulkhead: 1,164 tons, 2.4 %
- Armament: 4,614 tons, 9.5 %
- Armour Deck: 6,076 tons, 12.6 %
- Conning Tower: 518 tons, 1.1 %
Machinery: 3,429 tons, 7.1 %
Hull, fittings & equipment: 17,849 tons, 36.9 %
Fuel, ammunition & stores: 5,259 tons, 10.9 %
Miscellaneous weights: 400 tons, 0.8 %
- On freeboard deck: 400 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
81,554 lbs / 36,992 Kg = 41.8 x 15.7 " / 400 mm shells or 14.0 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 8.1 ft / 2.5 m
Roll period: 17.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.64
Seaboat quality (Average = 1.00): 1.37

Hull form characteristics:
Hull has a flush deck,
a normal bow and a round stern
Block coefficient (normal/deep): 0.560 / 0.565
Length to Beam Ratio: 6.54 : 1
'Natural speed' for length: 27.80 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 25.00 %, 37.47 ft / 11.42 m, 25.92 ft / 7.90 m
- Forward deck: 30.00 %, 25.92 ft / 7.90 m, 23.95 ft / 7.30 m
- Aft deck: 23.00 %, 23.95 ft / 7.30 m, 24.93 ft / 7.60 m
- Quarter deck: 22.00 %, 24.93 ft / 7.60 m, 25.92 ft / 7.90 m
- Average freeboard: 26.33 ft / 8.03 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 73.5 %
- Above water (accommodation/working, high = better): 185.7 %
Waterplane Area: 64,287 Square feet or 5,972 Square metres
Displacement factor (Displacement / loading): 112 %
Structure weight / hull surface area: 222 lbs/sq ft or 1,082 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.60
- 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

Battleship that started designing in 1936 at the eruption of the Sino-Korean War, based on the escalator clause of the Second London Naval Treaty. Originally conceived as a twelve-gun platform, it was changed to the current ten-gun form to ensure that sufficient armor can be added to resist the 18" guns of Chinese battleships.


Trying to expand the photo above into the SpringSharp specifications. I deliberately left out the anti-air guns because I haven't decided on the layouts or specifications. I do suspect I'll be adding something like 80 40mm AA guns and 56 20mm MGs.


Comments and questions are welcome, I wish to get things as settled as possible before I go on to actually draw the ship.

Can you build something to fight 18' guns on 45,000t ? (with 27Kn speed) I not sure you can IMO (and certainly not without going to a 3 turret layout and saving weight as much as posable with no ct etc).

For feedback on your design,(may not be good),
- Main Belt covers 82 % of normal length
- Armoured deck - multiple decks ?
- Torpedo Bulkhead 414.21 ft (and how wide between them are they ?)
- 13.0" Barbette

JSB

The drawing looks very very good indeed, even if it's not a shipbucket drawing.
Comments on the design:
It looks mostly solid, in my oppinion. For its displacement, it's rater ambitious, and I'd say it do so rather well. With it's comparatively meager gunnery, I doubt it would be able to deal with the armour of an opponent with 18" gunnery(presumably it would be protected against at least 16"), but your own ship would most certainly be able to take a beating.
Non-withstanding the critique from JSB, which I agree with, I like this one very much, and would deffinately say it's a workable design.
I'd change the armour deck to "Boxes over machinery and magazines", which is the deck armour version of the All-or-nothing scheme. It will save weight, which I'd instead put on speed.

JSB:
As for the main belt coverage deal: As long as it doesn't specifically mentions the main belt not covering engines and magazines completly, it's really fine, AFAIK.

First off let me add that I do like the drawing
(why must it fight 18' guns ? in OTL it would have been a fine BB)

KHT does "Boxes over machinery and magazines" not mean some CA/Cl type thing ? should you not just go for a single deck ?

JSB

To be frank, I'm not 100% sure. I've used it largely as All-or-nothing deck armour. I bumped into it elsewhere, and have used it as such ever since. It made sense at the time at least.
I'm not really opposed to the idea of multiple decks though - it was used a lot IRL. An upper deck which would hopefully de-cap any APC-shells or have the detonate early, a main deck to take the brunt of the punch, and a lower deck to shield the inside from splinters from the above two. At least this is how I presume multiple decks work in Springsharp.

My understading (and looking at the pic at the bottom of the page in springsharp) was that single deck was a complete thick deck ie post jutland design (ie Nelson), multiple decks means like Hood or before, Protected deck is like Bismark and boxes is just for CA/CL/and older AC/PC that dont have a full belt/deck ? Not sure but I think it will make a big diffrence to how much weight it takes up (and if it helpes stuructural strength like in later ships)
JSB

Single and multiple decks weight the same(from my experiance with SS), boxes weight varies with the power of the engines and the size of the magazines. I don't know about the protected deck, mostly because I rarely if ever sim ships of that particular type and era.
You way very well be right about how to use the different deck types though.

31 feet.

Yeah, the barbette is an issue. There's the Iowa/Montana style massive barbette, and there is the King George V/Vanguard style "rely on the belt". I'm leaning towards the latter to save on weight.

It'll be using its own SHS, so it might just barely be able to handle the Chinese battleships.

Apparently someone from another another comminuty who uses SpringSharp a lot said the following in the past:
I'll think about this.


United China which left the naval treaties and started developing 18" battleships.



Thanks for the comments so far!

I agree with the quote on 'box' etc.

Barbet wise you could go light and hope flash protection in good but in that case why the thick turret faces ?

If anybody was publicly making 18' battleships (rather than "40 cm/45 Type 94" (15.9 inch) haha) then the treatys (and 45k) limit are dead..... (so you are only limited by drydocks and cost)

JSB

Alrighty, fair enough. You learn something new every day, I guess.