Treaty Cruiser Design Challenge

Getting mine in just under the wire.

Ladies and Gentlemen, I present the Olympia-class Cruiser. Designed to comply with the Washington Naval Treaty, the single ship Olympia-class cruiser was the first to incorporate, from inception, the concept of using float-planes as scouts. Initially designated as a light cruiser, after construction started she was quickly reclassified as a heavy cruiser. The Olympia-class led into the design of the Pensacola-class. The initial plan for the Olympia's was 7 vessels, but the Navy decided to stop after only the Olympia was completed, due to the then upcoming Pensacola-class and Northampton-class cruisers. Built in the Puget Sound Navy Yard in the state of her Namesake, the Olympia, like her single class predecessor, was a pioneer in the development of naval technology. After she was commissioned, the Olympia was made the flagship of the Hawaiian Detachment, from 1927-1937, when she was then reassigned to the Philippines as the Flagship of the Asiatic Fleet. Stationed out of Cavite Naval Yard, she was the flagship until replaced by the USS Houston, in November of 1940. She was made the flag ship of the Asiatic Fleet's Scouting division. On the night of the Pearl Harbor attack, Olympia got underway from Panay Island with the USS Houston and other fleet units bound for Darwin, Australia, where they arrived on December 28th, 1941 by way of Balikpapan and Surabaya. After patrol duty, she joined the American-British-Dutch-Australian (ABDA) naval force at Surabaya.

Olympia-class Cruiser:

Ordered: January 28, 1921

Awarded: November 11th, 1921

Keel Laid: October 15th, 1922

Launched: December 2nd, 1926

Completed: July 25th, 1927

Commissioned: December 17th, 1927

Armorment: (1927)
8x 8"/55 cal guns in 4x turrets.
6x 5"/25 cal guns in open single mounts
4x 3"/50 cal guns
2x 3-pounder (1.9 in) saluting guns
2 21" Triple tube Torpedo Lauchers

Armorment: (1942 Cavite refit)
8x 8"/55 cal guns in 4x turrets.
6x 5"/25 cal guns in open single mounts
8x 3"/50 cal guns
2 × 3-pounder (1.9 in) saluting guns
2 × 1.1"/75 anti-aircraft guns

Armor:
Belt: 2.5–4 in (64–102 mm)
Deck: 1–1.75 in (25–44 mm)
Barbettes: 0.75 in (19 mm)
Turrets: 0.75–2.5 in (19–64 mm)
Conning Tower: 1.25 in (32 mm)

Propulsion:
4x Parsons reduction steam turbines
4x screws

Speed: 32.5 kn

Range: 10,000 nmi at 15 kn

Crew: 85 Officers, 50 Senior Enlisted, 400 Rated Enlisted

First in SB Gray:
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USS Olympia, as Built:
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USS Olympia, in 1942:
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Olympia would survive the war, and become a museum ship in her namesake city, Olympia, WA.

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"It is better to type nothing and be assumed an ass, than to type something and remove all doubt." - Me

This thread is generating some amazing artwork.

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Would you please not eat my gun...
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Whilst a nice design, that superstructure is far to modern for something laid down in the early 20s.

Bit of a late submission but here goes:

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Romana Class Heavy Cruiser

Displacement
9,845 tons (standard)

Dimensions
Length: 197m oa
Beam: 20.5m
Draught: 5.5m

Armament
4x2 203mm/53 Model 1929
8x1 100mm/47 Model 1928
8x1 37mm/54 Model 1938
2x4 21in torpedo-tube mountings

Armour
Belt: 3in
Main turrets: 3in
Deck: 1.5in

Machinery & Performance
84,000shp steam turbines
Speed: 32kts (standard displacement)
Endurance: 6,000nm at 14kts

Edited typo with secondary guns

The drawing does not seem to match the armament stats. At least 8x100mm.

Beautiful

(and yes, 100mm guns number do not batch between stats and drawing -4 to 8-, but it might just be a typo.)

Here is my (very late) entry.

Cretan Multi-task cruiser:
Traditionnaly since the pre-dreadnaught area the cretean navy was ordering a class of four cruiser every four years, those ships remained on full duty for twelve years with a variable numbers of refit. They are then placed in reserve for four more years. During this period some are refitted as consular cruiser for use in the cretan "Consular Territories" (small commercial colonies).

In early thirties, the admiralty decided that the ships should be able to perform the consular task without heavy transformations. Therefore the cruisers could be turned back to full active duty quikly if needed, and the active ships could perform occasional "consulars cruise". The scheduled 1935 class integrated this requirement.
The design was significantly larger than its predecessors but it kept the traditionnal cruiser mains armement layout in triple turrets, one at the prow, two at the stern but with new 170mm/L60 guns. It integreated the latest cretan technical evolutions: diesel-electric powerplant, dualpurpose secondary artillery (four 3X90mm/L50 turrets), fully encloased droppable watercrafts.....
Like contemporaries cretan ships, it integrate uge mechanical and electrical assitance to reduce human needed workforce. The extra space was used to fit large storage spaces, a bigger aviation group (5 collapsable floatplanes instead of two) and two patrol motor-launchs.

When the two first ships were launched it was decided to integrate the futur autogyro under devellopment to the aerial group for experiment duty. The floatplanes had to be kept to compare both types. A new smaller hangar for two floatplanes was fitted at the prow with retractable catapult and crane. The original crane and catapult wer removed to accommodate two large autogyros.
The front facilities were finally removed when the new aircraft proved it could fullfil all the task satisfactorily.
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A word about the sources and design:
The base is a japanese Garlic entry hull . Then fitted with cretan parts i've started to create for my AU project.
As i didn't had the time to down scale the autogyro that i'm actually drawing in FD scale, i choosed to post only the original design. Other verions will follow in another tread.

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

JE SUIS CHARLIE

The last minute submission, a heavy cruiser from my NS nation. She plays a major role in one of the most important parts of the region's history.

Ordered as the last ships of the Via Victis Act Naval Authorization, the Plaistow class represent the ultimate treaty cruiser design of the Miklanian Navy. They followed the successful Northwynne class. The layout was derived from a 1936 preliminary design for a heavy cruiser that came as close as possible to the 10,000 long ton standard displacement limit imposed by the Nolon City Naval Arms Limitations Treaty. Previous classes had been designed to 8,500 long tons to provide sufficient margin for weight overruns and still remain well within the treaty requirements. But by the mid 1930’s it was apparent that most treaty signatories were ignoring the treaty requirements and building cruisers thousands of tons overweight. The development of fast and heavily armored Keomoran cruisers were of particular concern. A class designed to 10,000 tons was authorized in an attempt to counter these ships. Weight overruns in excess of 1,000 tons were not tolerated by the authorization. While the Navy had no qualms building even larger ships, the Diplomatic Service still held hope for future naval treaties and wanted the advantage of the moral high ground in future negotiations.

The primary armament remained nine 8”/55 guns in three turrets. The class utilized a new Mk.10 turret design that allowed for independent elevation of the guns. An increase in turret and barbette size was offset by the reduction of the size of the secondary battery. The secondary armament was reduced from eight 5”/40 dual-purpose guns and four 3”/50 DP guns as on previous heavy cruiser designs to six 5”/40 DP guns. The only major upgrade to the secondary armament was the use of fully enclosed and powered mounts. Two Mk. 32 directors were provided for the primary and two Mk. 36 for the secondary battery. The secondary directors were fully capable of managing the primary guns for redundancy.

As built the anti-aircraft armament consisted of the six dual purpose 5” guns, twelve 40mm Bofors guns in six twin mounts (the first application of Bofors guns on an RMN vessel), and ten single water-cooled .50 caliber machine guns. The anti-aircraft armament would change repeatedly throughout the service life of the ships.

The increase in protection compared to older cruiser classes was significant. Previous heavy cruisers had a maximum of 5” of belt armor, while Plaistow boasted 6” at the water line. An all-or-nothing armor scheme was adopted to provide maximum protection for the given weight margin. The weather deck had 1” of armor, with a main armor deck of 2 ¼” extending from seven frames forward of A turret to the stern. ¾” splinter decks were provided all the way down to the bilge. The turret faces had 6” of Class A armor, with 4” Class B for the sides and rear. The turret roof was 2” of Class B. The barbettes were 7” Class A all around. The citadel was enclosed by 4” of armor. The conning tower walls were 6” with a 2 ¼” roof. Torpedo protection was provided by two watertight bottoms with two internal torpedo bulkheads between them on the sides, the outer being liquid loaded and the inner void. Torpedo bulges were considered but not installed due to the detrimental effects on displacement and speed.

Plaistow was laid down in 1937 and launched in 1938. She weighed 10,420 long tons at standard loading. Rye followed in 1939 and Hampton in 1940. Rye was deployed north to Second Fleet in Alta, Polar Svalbard. Plaistow and Hampton remained at home in First Fleet. In 1940 the Nolon City Treaty was officially voided with the launch of the Keomoran B41 class battleship. Construction of Plaistow class Cruisers was cancelled, and work began on detailed design of a derived but larger 17,000 ton contingency class. This became the Debrecen class heavy cruiser. When the Imperial War began in March 1941 with the Keomoran invasions of central Argus, the Debrecen class was not yet in service. For the first four months of the war, the three Plaistows were the most advanced cruisers in the fleet. In the initial wave of declarations of war, Cruiser Squadron 14, with both Plaistow and Hampton, was the closest to Athara Magarat, which made it’s declaration of war against the Free Powers mere minutes before their first shots were fired. A formation of thirty land based torpedo bombers attacked the Miklanian cruisers, hitting none but losing eight of their aircraft. Plaistow had fired the first Miklanian shots of the war. Plaistow and Hampton continued to sail with First Fleet in the south western theatre for the remainder of 1941. Rye escorted the Svalbardian carrier Stalharx as part of her Second Fleet duties.

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Plaistow would serve through the rest of the war, being modified several times, and ultimately surviving both of her sisters. But these are drawings and stories for another time.

RMS Plaistow was decommissioned and stricken from the naval record in 1951, and sold to the Garrett Shipbreaking Yard in Hampton. Her bell and starboard anchor are on display at a memorial in downtown Plaistow.

Statistics:
Displacement, Standard (As Built, 1938): 10,420 long tons
Displacement, Standard (Armistace, 1948): 10,940 long tons
Length: 607'
Beam: 59' 6"
Draft: 21' 7"

Propulsion:
4x Isotoni boilers
4x shafts

Speed: 32 knots

Range: 10,000 nmi at 15 knots
Complement: 929 Officers and Men

Protection:
Belt: 6"
Deck: 2.25"
Turrets: 6"
Barbettes: 7"
Conning Tower: 6"

Armament (As Built):
9x 8"/55 guns in Mk.10 3-Gun turrets
6x 5"/40 Mk.31 in single mounts
12x 40mm Bofors anti-aircraft guns in 6x twin mounts
10x Coldstream Armory Mk.1 .50" water cooled anti-aircraft guns

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Drawings signed both (Miklania) and (M.Morris)

Well, my revised Spokane Class, didn't make it. Good Luck ALL!

Lock the Thread, Shigure!

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"It is better to type nothing and be assumed an ass, than to type something and remove all doubt." - Me

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