WesWorld

Submitted for your scrutiny is another small cruiser design I am considering. Feedback is welcome.

Design 40K Flotilla Cruiser laid down 1940

Displacement: 6,352 t light; 6,664 t standard; 7,324 t normal; 7,853 t full load

Dimensions: Length overall / water x beam x draught
575.17 ft / 557.74 ft x 50.03 ft x 18.37 ft (normal load)
175.31 m / 170.00 m x 15.25 m x 5.60 m

Armament:

8 - 5.91" / 150 mm guns (4x2 guns), 102.98lbs / 46.71kg shells, 1938 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 3.46" / 88.0 mm guns (4x2 guns), 20.79lbs / 9.43kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on centreline, all amidships
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.79" / 20.0 mm guns (2x4 guns), 0.24lbs / 0.11kg shells, 1940 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 1,004 lbs / 456 kg
Shells per gun, main battery: 280
6 - 21.7" / 550 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.97" / 50 mm 433.40 ft / 132.10 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 120 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm 0.79" / 20 mm
2nd: 0.79" / 20 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -
4th: 0.39" / 10 mm - -

- Armour deck: 0.98" / 25 mm, Conning tower: 1.97" / 50 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 87,933 shp / 65,598 Kw = 35.00 kts
Range 7,000nm at 15.00 kts
Bunker at max displacement = 1,189 tons

Complement: 395 - 514

Cost: £3.942 million / $15.767 million

Distribution of weights at normal displacement:
Armament: 126 tons, 1.7 %
Armour: 756 tons, 10.3 %
- Belts: 338 tons, 4.6 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 50 tons, 0.7 %
- Armour Deck: 352 tons, 4.8 %
- Conning Tower: 16 tons, 0.2 %
Machinery: 2,351 tons, 32.1 %
Hull, fittings & equipment: 3,059 tons, 41.8 %
Fuel, ammunition & stores: 972 tons, 13.3 %
Miscellaneous weights: 60 tons, 0.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,351 lbs / 2,881 Kg = 61.7 x 5.9 " / 150 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 2.2 ft / 0.7 m
Roll period: 14.2 seconds
Steadiness - As gun platform (Average = 50 %): 66 %
- Recoil effect (Restricted arc if above 1.00): 0.47
Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.500
Length to Beam Ratio: 11.15 : 1
'Natural speed' for length: 26.73 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 65
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.18 ft / 9.20 m
- Forecastle (22 %): 22.31 ft / 6.80 m
- Mid (50 %): 22.31 ft / 6.80 m (14.11 ft / 4.30 m aft of break)
- Quarterdeck (15 %): 14.11 ft / 4.30 m
- Stern: 14.11 ft / 4.30 m
- Average freeboard: 18.90 ft / 5.76 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 119.5 %
- Above water (accommodation/working, high = better): 139.4 %
Waterplane Area: 19,335 Square feet or 1,796 Square metres
Displacement factor (Displacement / loading): 112 %
Structure weight / hull surface area: 92 lbs/sq ft or 448 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.01
- Longitudinal: 1.70
- Overall: 1.06
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent

60 tons miscellaneous weight reserved for radar/design growth