Treaty Cruiser Design Challenge

[Shigure]

Sorry, but I'm not extending the due date

[maomatic]

Excellent work Tigerhunter & Shigure, very cool designs (and camos)!

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@ Krakatoa:
To be honest, I thought I'd save some considerable weight, when going for the 10-barrel version. (and I thought it looked cooler... )
When I calculated your proposal in springsharp, I found out, that it did not save as much as I hoped. With a few minor tweaks, I was able to easily build a 4x3 variant.

Makes me wonder, though, why the proposed 15cm Seydlitz CLs would have had a displacement of around ~15000ts. (other than being excessively overengineered/equipped...)

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Garlicdesigns' suggested 17cm version made me curious myself, so I decided to draw a "Medium"/Heavy cruiser variant of my Wiesbaden-class.




(The camo is based on a scheme worn by either T-22 or T-23 in 1943.)

Honestly, I don't really know what to think of it.
According to springsharp, I've made a smaller, marginally faster, yet more heavily armored version of the Hipper. The trade-offs, are a weaker main-, DP- and torpedo-armament.



Report (wish you could still hide this stuff as "spoiler"):

Rostock, Germany Heavy Cruiser laid down 1939

Displacement:
9.638 t light; 9.981 t standard; 11.140 t normal; 12.067 t full load

Dimensions: Length overall / water x beam x draught
625,48 ft / 598,92 ft x 62,99 ft x 20,67 ft (normal load)
190,65 m / 182,55 m x 19,20 m x 6,30 m

Armament:
8 - 6,81" / 173 mm guns (4x2 guns), 157,98lbs / 71,66kg shells, 1939 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, all raised mounts - superfiring
8 - 4,13" / 105 mm guns (4x2 guns), 35,32lbs / 16,02kg shells, 1930 Model
Dual purpose guns in deck mounts
on side, all amidships, all raised mounts - superfiring
16 - 1,46" / 37,0 mm guns (8x2 guns), 1,55lbs / 0,70kg shells, 1930 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
21 - 0,79" / 20,0 mm guns (9 mounts), 0,24lbs / 0,11kg shells, 1930 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised guns
Weight of broadside 1.576 lbs / 715 kg
Shells per gun, main battery: 130
6 - 21,0" / 533 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4,33" / 110 mm 376,18 ft / 114,66 m 10,33 ft / 3,15 m
Ends: 0,79" / 20 mm 220,90 ft / 67,33 m 9,51 ft / 2,90 m
1,84 ft / 0,56 m Unarmoured ends
Main Belt covers 97% of normal length
Main belt does not fully cover magazines and engineering spaces

- Torpedo Bulkhead:
0,79" / 20 mm 376,18 ft / 114,66 m 18,47 ft / 5,63 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4,72" / 120 mm 2,76" / 70 mm 4,33" / 110 mm
2nd: 0,79" / 20 mm - -

- Armour deck: 1,97" / 50 mm, Conning tower: 4,72" / 120 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 101.254 shp / 75.536 Kw = 32,90 kts
Range 6.000nm at 18,00 kts
Bunker at max displacement = 2.086 tons

Complement:
541 - 704

Cost:
£5,157 million / $20,628 million

Distribution of weights at normal displacement:
Armament: 197 tons, 1,8%
Armour: 2.350 tons, 21,1%
- Belts: 769 tons, 6,9%
- Torpedo bulkhead: 202 tons, 1,8%
- Armament: 413 tons, 3,7%
- Armour Deck: 915 tons, 8,2%
- Conning Tower: 51 tons, 0,5%
Machinery: 2.740 tons, 24,6%
Hull, fittings & equipment: 4.301 tons, 38,6%
Fuel, ammunition & stores: 1.502 tons, 13,5%
Miscellaneous weights: 50 tons, 0,4%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13.272 lbs / 6.020 Kg = 84,0 x 6,8 " / 173 mm shells or 2,1 torpedoes
Stability (Unstable if below 1.00): 1,04
Metacentric height 2,7 ft / 0,8 m
Roll period: 16,1 seconds
Steadiness - As gun platform (Average = 50 %): 65 %
- Recoil effect (Restricted arc if above 1.00): 0,44
Seaboat quality (Average = 1.00): 0,93

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,500
Length to Beam Ratio: 9,51 : 1
'Natural speed' for length: 24,47 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 70
Bow angle (Positive = bow angles forward): 30,80 degrees
Stern overhang: 9,84 ft / 3,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28,05 ft / 8,55 m
- Forecastle (19%): 20,18 ft / 6,15 m
- Mid (50%): 18,21 ft / 5,55 m
- Quarterdeck (18%): 18,21 ft / 5,55 m
- Stern: 19,19 ft / 5,85 m
- Average freeboard: 19,57 ft / 5,97 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 138,1%
- Above water (accommodation/working, high = better): 147,3%
Waterplane Area: 25.137 Square feet or 2.335 Square metres
Displacement factor (Displacement / loading): 118%
Structure weight / hull surface area: 109 lbs/sq ft or 532 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,98
- Longitudinal: 1,19
- Overall: 1,00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[Krakatoa]

Nice work Maomatic,the 17cm version looks good, and I like the turret you have drawn for them.

[reytuerto]

Good afternoon.
Here is my candidate:


Displacement:
10,000 metric tons standard; 12.200 metric tons full war load.

Dimensions: 182.00 m x 19.00 m x 5.30 m

Laid down: 1927, Launched: 1931, Completed: 1933.

Armament:
(3x3) x7.5/50 inch 250 pounder (112 kgs) x 9 broadside. 200 per gun.
(4x2) x 4/45 inch 40pounder, 450 per gun.
(6x2) x 40/60 mm twin Bofors model 1928.
(3x4) x 21 incher TT with heather. 3 reloads per tube
2 x spotting and recce light seaplane, 1 catapult.

Protection:
Armoured Belt: 6 inch
Armoured deck: 4 inch over vitals, 1 inch parallel armoured deck.
Turret face: 6 inch. Turret roof: 5 inch. Barbette: 5 inch,
Conning tower: 4 inch.

Machinery:
Oil fired Thornycroft type boilers, geared steam turbines. 4 shafts, 84,000 shp. 32,00 kts
Range 7,000nm at 18.00 kts

Complement:
700

[Charguizard]

We've had some great entries yet! I'm actually nervous about the outcome now
The story for Shig's entry also made me depressed for about 5 minutes.

[Shigure]

Could I please get some volunteers for judges please.

[Rodondo]

Blake Class

ITL, the RN caught a lighter break regarding heavy cruisers and were allotted 21 units. Having agreed upon 15 Counties and B-Counties, they considered the construction of 2-6 10,000t Station Flagships to reduce the workload for the few battleships and battlecruisers left and to beef up far areas. In this brief, they designed a 10,000t 12x203mm armed cruiser capable of hounding down commerce raiders, fighting as head of a cruiser division. The design was tight to the limits set down by the WNT. In the end, at commissioning HMS Blake came in at 10592t, some 6% overweight. Ships of the class included Tiger, Blake and Drake. Laid down starting 1929, the ships were slow to complete due to economic factors. HMS Blake was launched in 1934. The colony of Victoria was offered a ship at 85% payment, however due to the depression the VCN instead opted to modernize the three cruisers in it's force, coming in at ~30% of the cost.

Depicted here is what a potential Blake Class in VCN service would look like


Length: 654ft
Beam: 64.5ft
Draught: 20.5ft
Displacement: 10,592t Standard
Armament: 4x3 203mm, 6x1 75mm, 4x 2pdr pompoms & 2x3 533mm torpedo tubes
Machinery: 90,000shp, 15 boilers,
Performance: 31.6kts
Range: 8900nm @12.8kts
Armour: 100mm belt, 45mm decks over vitals, 100mm conning tower.


I was going to do a 4-view and I did work out most of it but run out of time plus I love to slap that COA on everything

[Hood]

A late second entry from me.



HMS Lancaster, in 1934

The expensive Class A cruisers meant that the Admiralty soon returned to the Class B cruiser to increase numbers. The Lancaster Class were smaller than the previous HMS York and Exeter and displaced less but had similar armament. Ideally suited to scouting they sacrificed some range due to their small size but on completion they had one of the best anti-aircraft fits of any cruiser. Armour was on a par with HMS Exeter with slightly thicker magazine box sides.The design was based on the Leander Class light cruisers and shared a similar compact hull.
The design was approved and HMS Lancaster and Edinburgh were laid down in 1931 and HMS Canterbury and Belfast were laid down the following year. They were commissioned in 1934-35.

Displacement
7,350 tons (standard)

Dimensions
Length: 544ft (oa), 538.5ft (wl)
Beam: 56ft
Draught: 17ft

Armament
3x2 8in Mk.II turrets (150 rpg)
4x1 4in QF Mk.V HA mounts (200 rpg)
2x4 2pdr Mk.M pom-pom mounts (1,000 rpg)
2x4 12.7mm machine-gun mounts (1,500 rpg)
2x4 21in torpedo-tube mountings (9 reload torpedoes)
2x Hawker Nimrod reconnaissance aircraft

Armour
Belt: 3in
Magazines: box protection (5in top and 4in sides)
Main turrets: 1in
Deck: 1.5in

Machinery & Performance
72,000shp steam turbines
Speed: 32.5kts (standard displacement)
Endurance: 5,600nm at 14kts

[Shigure]

Just in time

Only a full day left.

[Blackbuck]

Neat. I wonder if you could go down the route of the Amphions for the second pair and use unitised machinery.