Washington Naval Treaty Centennial Challenge

Shimotsuke Class Battleship

During the mid-to-late 1930s, Zipang Admiralty under the supervision of the Japanese naval staff began design work on a new class of Battleship. this was undertaken both to supplement capital ship losses sustained during the Japanese, Zipang war of 1934, as well as to address the aging nature of the already existing battle line. And even with vocal opposition from the Japanese Admiralty, the class would be designed in accordance with the limitations of the Washington naval Treaty, and as a result after a relatively short design process. three battleships of the newly christened Shimotsuke class would be laid down starting in the mid-1930s.

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Tonnage - 35,000 tonnes standard, 45,644 tonnes full load
Speed - 27 knots max
Range - 8000nm at 10 knots
Main Armament - 3x3 Type 35 14"/50 guns
Secondary Battery - 8x2 Type 39 Mod-1 5"/38 guns
AA Armament - 6x2 Type 29 Mod-3, 4x1 Type 29 Mod-1
Armor - 12" main belt, 5." deck over magazines, 14" barbettes/turret face/conning tower

Ships in class

Shimotsuke (BB-16) - Scrapped 1952
Rikuzen (BB-17) - Scrapped 1963
Hull 111 (EX-BB-18) Scrapped 1941

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Work list: 1. various pre-1900 Zipang ships 2. Some protected cruisers and other miscellaneous projects

Congress Class Battlecruiser President

Seeing the relative success of battlecruisers within the First Great War, the Ussatian Navy wished to have a class of its own to supplement its battleship fleet. In the mid to late 1920s, a request was sent to multiple shipbuilders across the nation to develop a battlecruiser with that could mix firepower with speed, even if this meant having little armour. The victorious design was chosen in 1930, and 3 orders were placed for the Congress class, which was the first class to be named so since a series of sailing ships from the late 1700s. Congress and President were first to be laid down in 1931 and were launched in 1934 and 1935, respectively. The ships had a unique design in the majority of their firepower were placed entirely forward in an ABC layout, whose weight had to be counteracted with machinery, another turret and other material placed in the rear. The final ship, Independence would be paused after being laid down in 1937 and completed as a battleship with a more conventional layout than her sisters in 1942.

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Tonnage - 31,000 tonnes standard, 38,000 full load
Speed - 31 knots max
Range - 7000 nm at 15 knots
Main Armament - 4x3 12"/50 Mark 4 guns
Secondary Battery - 8x2 5"/38 guns

Ships in class

Congress (CB-12) - Sunk, 1945
President (CB-13) - Scrapped, 1961
Independence (CB-14, completed as BB-51) - Transferred to Trecinco in 1961, preserved as of 2005

Arnaud Dassault-class

The Arnaud Dassault was a proposal for a new generation of capital ships for the Eurasian National People's Navy by industrialist Leonidas Roon. Designed to defeat new generations of enemy cruisers, she was armed with 330mm cannons and was immune to 8-inch/210mm shells. Furthermore, with envisioned new technology and machineries, she was touted to be able to reach 35-knots while still within the limitations imposed by the increasingly impotent Peace of Jerusalem. However, she was an ambitious design and was criticised for several flaws. By the time the Arnaud Dassault was given to the People's Bureau of Naval Affairs, the 330mm cannons has been deemed to be too weak for capital ships and any future ships will be armed with the newly designed 410mm cannon. The 150mm dual-purpose guns were also known for being unreliable and especially useless in its role as an anti-aircraft weapon. Her armour was criticised for being too thin for a ship of such size.

Eventually, the ship was shelved and Leonidas Roon was quietly encouraged to continue overseeing construction instead of designing ships. He continued designing ships, none of which went anywhere beyond perhaps wasting some bureaucrat time.

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Preobrazhensky Class battleship

Often called the Guadrians of Petrograd by the Russians or the Bane of the Baltic by the Germans and Swedes, the Preobrazhensky class were a unique class of battleships who's apperance looked dated till one took a closer look.

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Tonnage - 27,036 t light; 29,184 t standard; 30,600 t normal; 31,733 t full load
Speed - 22 knots max
Range - 8,000nm at 12 knots
Main Armament - 2 x 4 16.00" / 406 mm 45.0 cal M1917 guns
Secondary Battery - 8 x 2 6.00" / 152 mm 50.0 cal M1918 guns
AA Armament - 8x 1 3.00" / 76.2 mm 45.0 cal M1915 guns
Armor - 14.0" / 356 mm main belt, conning tower, main gun face and barbette, 4.00" / 102 mm secondry gun face, barbette and citidel deck

"Jagehrsch, Herald of the Storm"

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"Battleship class designed to be used as flagships in the overseas colonies, making use of its air and sea complement, to serve as mobile bases, for the defense of the territorial integrity of the Caelyran Dominion. Though, they still can be used, in a limited way, in offensive actions."

Armament:
2x 330mm Quadruple gun turrets
1x 150mm Triple gun turret
8x 90mm AA twin gun turrets
6x 50mm AA single gun mounts
12x 15mm AA twin machinegun mounts

7x Gefahternel Ge-23 Floatplane (Bomber, torpedo bomber)
3x Höchler Ho-44 Floatplane (Scout, fighter)

2x VB-300 Torpedo-armed Motorboats

The_Overseer wrote: *

November 23rd, 2022, 7:26 am

"Jagehrsch, Herald of the Storm"

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Very nice,
It looks like an upscaled version of the Charguizard de Villers-class concept (from Treaty Cruiser Design Challenge).
By the way drawing your float-planes in FD scale would be a nice addition.............

_________________
"You can rape history, if you give her a child"
Alexandre Dumas

JE SUIS CHARLIE

Quote:

Very nice, It looks like an upscaled version of the Charguizard de Villers-class concept (from Treaty Cruiser Design Challenge).
By the way drawing your float-planes in FD scale would be a nice addition.............

Thaaanks, and yes, I did get some inspiration though, the ship's design is based on the “North Carolina Preliminary Scheme F 1934-35”, such a beautiful ship.
And of course, at some point I will make the planes in FD scale.

Plan C-2, planned replacement for the Songrimsŏng-class battleships

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Under the terms of the Selkiö Naval Treaty, Menghe was allowed to lay down three battleships in 1935, 1936, and 1937 as replacements for the three Songrimsŏng-class battleships. These battleships would be limited to an individual displacement of 35,000 tonnes, and furthermore would be limited to a main gun caliber of 14", like their predecessors.

Menghean engineers considered a variety of proposals, including a 32kt fast commerce raider, before settling on the final design, which was designated Byŏng-i (Byŏng as the third ordinal stem and i meaning two), often rendered C-2 in Western sources. C-2 was a relatively conservative design, reflecting the conservatism of the Imperial Menghean Navy: with a design speed of 28 knots and a range of 4,000 nautical miles at 14 knots, it was designed to sortie from port and engage in a decisive line battle along Menghe's other battleships. Further reflecting this role, it had a 350mm main armor belt and a 125mm armor deck with a 25mm de-capping plate above, making it one of the more heavily-armored treaty battleship designs. The main armament of twelve 356mm guns was also selected to preserve the Songrimsŏngs' 12-gun broadside, albeit in a 3x4 arrangement rather than their precursors' 4x3. The four-gun turrets would have been built with anti-flash protection walls between the port and starboard gun wells to limit damage from penetrating hits and accidents.

Compromises showed up not just in range and speed, but in the arrangement of the secondary battery, which consisted of eight 130mm L/55 Type 32 high-velocity guns in two four-gun (two-pair) dual-purpose turrets. The superfiring positioning of these turrets allowed reasonable weight savings, as all eight guns could be fired in broadside, and four could cover targets directly forward or astern. The firing arcs of these turrets, however, were mediocre, with each one able to cover a 240-degree arc. Concentration of the secondary guns also meant that if either turret became disabled due to mechanical faults or enemy fire, the ship would lose half her secondary armament and gain a 120-degree secondary blind spot. The Imperial Menghean Navy considered these drawbacks acceptable, especially as it was working under the impression that an enemy fleet would be limited in the number of light surface combatants it could bring along.

The compromises in anti-air protection would have been less acceptable. The quad 130mm dual-purpose turret's slow traverse speed gave it a hard time tracking fast-moving aircraft, especially as the 30s gave way to the 40s, and the Type 32 gun's unitary, brass-case 130mm ammunition was heavy and unwieldy, meaning that crews quickly grew exhausted during sustained engagements. Neither of these flaws was apparent to designers in 1935, when the IMN still anticipated that aircraft would conduct brief engagements in small groups, making a long-ranged, highly accurate flak gun like the Type 32 ideal for countering them. The initial blueprint also called for twelve 37.5mm anti-air guns in six mounts, firing contact-fused, manually-loaded ammunition; if Plan C-2 had been laid down in 1935 as initially planned, these would have almost certainly been replaced by Type 38 37.5mm anti-aircraft autocannons during fitting-out.

Menghe made preparations to lay down the first C-2 battleship in 1935, but on 7 May of that year Menghe declared war on Sylva, beginning the collapse of the Selkiö treaty system. None of the C-2 battleships were ever built, though their design laid the groundwork for Menghe's wartime Chanam-class battleships, which far surpassed the 35,000-ton limit and boasted superior speed and range. Because they were never laid down, they never received names, so this image is simply captioned "Plan C-2 battleship" and does not show a name on the hull side.

Code: Select all

BB Plan C-2, Imperial Menghe Treaty battleship laid down 1935

Displacement:
	32,466 t light; 34,989 t standard; 36,131 t normal; 37,045 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(710.58 ft / 693.57 ft) x 108.60 ft x (30.81 / 31.39 ft)
	(216.58 m / 211.40 m) x 33.10 m  x (9.39 / 9.57 m)

Armament:
      12 - 14.02" / 356 mm 50.0 cal guns - 1,457.37lbs / 661.05kg shells, 170 per gun
	  Breech loading guns in turret on barbette mounts, 1935 Model
	  3 x 4-gun mounts on centreline ends, majority forward
		1 raised mount - superfiring
      8 - 5.12" / 130 mm 55.0 cal guns - 72.36lbs / 32.82kg shells, 400 per gun
	  Dual purpose guns in turret on barbette mounts, 1932 Model
	  2 x Quad mounts on centreline ends, evenly spread
		2 double raised mounts
      12 - 1.48" / 37.5 mm 50.0 cal guns - 1.70lbs / 0.77kg shells, 1,500 per gun
	  Anti-air guns in deck mounts, 1930 Model
	  5 x Single mounts on sides, evenly spread
		4 raised mounts
	  1 x Single mount on sides, forward deck aft
		1 double raised mount
      8 - 0.49" / 12.5 mm 60.0 cal guns - 0.07lbs / 0.03kg shells, 10,000 per gun
	  Machine guns in deck mounts, 1931 Model
	  6 x Single mounts on sides, evenly spread
		2 raised mounts
	  2 x Single mounts layout not set
		2 double raised mounts
      Weight of broadside 18,088 lbs / 8,205 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	13.8" / 350 mm	456.04 ft / 139.00 m	12.50 ft / 3.81 m
	Ends:	Unarmoured
	  Main Belt covers 101 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		2.95" / 75 mm	456.04 ft / 139.00 m	28.18 ft / 8.59 m
	Beam between torpedo bulkheads 78.74 ft / 24.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	15.7" / 400 mm	7.87" / 200 mm		13.8" / 350 mm
	2nd:	3.94" / 100 mm	2.95" / 75 mm		1.97" / 50 mm

   - Armoured deck - single deck:
	For and Aft decks: 5.91" / 150 mm
	Forecastle: 0.00" / 0 mm  Quarter deck: 2.95" / 75 mm

   - Conning towers: Forward 13.78" / 350 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 94,817 shp / 70,733 Kw = 28.00 kts
	Range 4,000nm at 14.00 kts
	Bunker at max displacement = 2,056 tons

Complement:
	1,309 - 1,703

Cost:
	£17.281 million / $69.125 million

Distribution of weights at normal displacement:
	Armament: 4,219 tons, 11.7 %
	   - Guns: 4,219 tons, 11.7 %
	Armour: 13,376 tons, 37.0 %
	   - Belts: 3,421 tons, 9.5 %
	   - Torpedo bulkhead: 1,404 tons, 3.9 %
	   - Armament: 3,000 tons, 8.3 %
	   - Armour Deck: 5,227 tons, 14.5 %
	   - Conning Tower: 324 tons, 0.9 %
	Machinery: 2,694 tons, 7.5 %
	Hull, fittings & equipment: 12,177 tons, 33.7 %
	Fuel, ammunition & stores: 3,665 tons, 10.1 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  48,717 lbs / 22,098 Kg = 35.4 x 14.0 " / 356 mm shells or 8.4 torpedoes
	Stability (Unstable if below 1.00): 1.17
	Metacentric height 7.5 ft / 2.3 m
	Roll period: 16.6 seconds
	Steadiness	- As gun platform (Average = 50 %): 51 %
			- Recoil effect (Restricted arc if above 1.00): 0.53
	Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
	Hull has a flush deck,
	  an extended bulbous bow and large transom stern
	Block coefficient (normal/deep): 0.545 / 0.548
	Length to Beam Ratio: 6.39 : 1
	'Natural speed' for length: 31.05 kts
	Power going to wave formation at top speed: 53 %
	Trim (Max stability = 0, Max steadiness = 100): 51
	Bow angle (Positive = bow angles forward): 25.00 degrees
	Stern overhang: 2.62 ft / 0.80 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	17.70 %,  30.84 ft / 9.40 m,  21.65 ft / 6.60 m
	   - Forward deck:	30.00 %,  21.65 ft / 6.60 m,  18.86 ft / 5.75 m
	   - Aft deck:	35.90 %,  18.86 ft / 5.75 m,  18.86 ft / 5.75 m
	   - Quarter deck:	16.40 %,  18.86 ft / 5.75 m,  18.86 ft / 5.75 m
	   - Average freeboard:		20.43 ft / 6.23 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 101.3 %
		- Above water (accommodation/working, high = better): 154.5 %
	Waterplane Area: 54,462 Square feet or 5,060 Square metres
	Displacement factor (Displacement / loading): 99 %
	Structure weight / hull surface area: 218 lbs/sq ft or 1,063 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.96
		- Longitudinal: 1.44
		- Overall: 1.00
	Adequate machinery, storage, compartmentation space
	Excellent accommodation and workspace room

_________________
Currently posting my latest ship art on my Menghean Navy AU thread, but most of my stuff is on iiWiki.

A bad peace is preferable to a terrible war.

Saria-Class Heavy Cruiser (Project 34)
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8,000-ton Heavy cruiser designed to be used as flagships for PRBN fleet.

Displacement: 8,200 tonnes standard
Installed Power: 8x water-tube boilers, 60,000 kW
Speed: 32.5 knots max

Main Armament: 6x 203mm guns (3x Twin mount)
Secondary Armament: 8x 100mm HA guns (4x Twin mount)
AA Armament: 14x 40mm AA guns (7x Twin mount) + 28x 20mm AA guns (14x Twin mount)
Torpedoes: 6x 533mm Torpedo tubes (2x Triple mount)

Armor: 80mm main belt + 40mm lower deck

LK15 Impereta class light cruiser

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Short description:
-LK15 class light cruisers were made with light but numerous armament to attack enemy supply convoys.
-lightly armoured
-introduced in early 30's
-used until 1946

Shipbucket

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