WesWorld

SNF Corvus, light cruiser laid down 1925


Displacement:
7.242 t light; 7.496 t standard; 10.001 t normal; 12.006 t full load


Dimensions: Length overall / water x beam x draught
599,40 ft / 577,43 ft x 52,49 ft x 21,00 ft (normal load)
182,70 m / 176,00 m x 16,00 m x 6,40 m


Armament:
6 - 6,00" / 152 mm guns in single mounts, 108,00lbs / 48,99kg shells, 1925 Model
Breech loading guns in deck mounts
on centreline, evenly spread, all raised mounts
16 - 0,50" / 12,7 mm guns (4x4 guns), 0,06lbs / 0,03kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 649 lbs / 294 kg
Shells per gun, main battery: 150
4 - 20,0" / 508 mm above water torpedoes


Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2,95" / 75 mm 408,14 ft / 124,40 m 8,69 ft / 2,65 m
Ends: 0,79" / 20 mm 169,26 ft / 51,59 m 8,69 ft / 2,65 m
Upper: 1,97" / 50 mm 375,33 ft / 114,40 m 8,01 ft / 2,44 m
Main Belt covers 109 % of normal length


- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2,36" / 60 mm - -


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


Machinery:
Coal fired boilers, steam turbines, Geared drive, 4 shafts,
75.645 shp / 56.431 Kw = 31,00 kts
Range 5.000nm at 22,50 kts
Bunker at max displacement = 4.510 tons (100% coal)


Complement:
499 - 650


Cost:
£2,290 million / $9,161 million


Distribution of weights at normal displacement:
Armament: 81 tons, 0,8 %
Armour: 1.556 tons, 15,6 %
- Belts: 716 tons, 7,2 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 50 tons, 0,5 %
- Armour Deck: 770 tons, 7,7 %
- Conning Tower: 20 tons, 0,2 %
Machinery: 2.702 tons, 27,0 %
Hull, fittings & equipment: 2.894 tons, 28,9 %
Fuel, ammunition & stores: 2.760 tons, 27,6 %
Miscellaneous weights: 10 tons, 0,1 %


Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
12.699 lbs / 5.760 Kg = 117,6 x 6,0 " / 152 mm shells or 1,5 torpedoes
Stability (Unstable if below 1.00): 1,53
Metacentric height 3,9 ft / 1,2 m
Roll period: 11,1 seconds
Steadiness- As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0,09
Seaboat quality (Average = 1.00): 1,01


Hull form characteristics:
Hull has raised forecastle, low quarterdeck
Block coefficient: 0,550
Length to Beam Ratio: 11,00 : 1
'Natural speed' for length: 24,03 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 18,50 degrees
Stern overhang: 13,12 ft / 4,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26,44 ft / 8,06 m
- Forecastle (20 %): 8,04 ft / 5,50 m (13,12 ft / 4,00 m aft of break)
- Mid (50 %):16,40 ft / 5,00 m
- Quarterdeck (15 %): 9,84 ft / 3,00 m (16,40 ft / 5,00 m before break)
- Stern: 9,84 ft / 3,00 m
- Average freeboard: 15,93 ft / 4,85 m


Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 94,5 %
- Above water (accommodation/working, high = better): 115,9 %
Waterplane Area: 21.154 Square feet or 1.965 Square metres
Displacement factor (Displacement / loading): 131 %
Structure weight / hull surface area: 84 lbs/sq ft or 412 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,03
- Longitudinal: 0,99
- Overall: 1,00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate






This is my first ship. To be honest I just got interested in the warships recently, so I am not completely sure about this ship. I would like to hear your opinions.
By the way, the acronym SNF of the ship is of: Ship of a Nonexistent Fleet.

Greetings! Welcome to Wesworld.

I am surprised by some of your design choices, which I suspect forced some compromises upon you. For a turbine-engine cruiser laid down in 1925, the choice of coal as fuel is rather anachronistic. Going with oil fuel will significantly increase efficiency and save internal space within the hull. Also, I would suggest making the main guns quick-firing (QF) rather than breech-loading.

Hello!
Thanks you, I didn't know about the coal. Also originally it was supposed to have quick fire guns, but I changed in the last minit. I have added some extra range and cruiser speed, also some armor. I am not sure about wich is the criterion for a light cruiser, but I think that maybe I put it to much armor.
The only restriction is the displacement.


This is the new and improved Corvus:


SNF Corvus, light cruiser laid down 1925

Displacement:
7.127 t light; 7.381 t standard; 10.001 t normal; 12.098 t full load

Dimensions: Length overall / water x beam x draught
599,40 ft / 577,43 ft x 52,49 ft x 21,00 ft (normal load)
182,70 m / 176,00 m x 16,00 m x 6,40 m

Armament:
6 - 6,00" / 152 mm guns in single mounts, 108,00lbs / 48,99kg shells, 1925 Model
Quick firing guns in deck mounts
on centreline, evenly spread, all raised mounts
16 - 0,50" / 12,7 mm guns (4x4 guns), 0,06lbs / 0,03kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 649 lbs / 294 kg
Shells per gun, main battery: 150
4 - 20,0" / 508 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3,15" / 80 mm 408,14 ft / 124,40 m 8,69 ft / 2,65 m
Ends: 0,79" / 20 mm 169,26 ft / 51,59 m 8,69 ft / 2,65 m
Upper: 2,36" / 60 mm 375,33 ft / 114,40 m 8,01 ft / 2,44 m
Main Belt covers 109 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2,36" / 60 mm - -

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

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 75.645 shp / 56.431 Kw = 31,00 kts
Range 5.500nm at 25,00 kts
Bunker at max displacement = 4.716 tons

Complement:
499 - 650

Cost:
£2,165 million / $8,659 million

Distribution of weights at normal displacement:
Armament: 81 tons, 0,8 %
Armour: 1.633 tons, 16,3 %
- Belts: 793 tons, 7,9 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 50 tons, 0,5 %
- Armour Deck: 770 tons, 7,7 %
- Conning Tower: 20 tons, 0,2 %
Machinery: 2.456 tons, 24,6 %
Hull, fittings & equipment: 2.947 tons, 29,5 %
Fuel, ammunition & stores: 2.874 tons, 28,7 %
Miscellaneous weights: 10 tons, 0,1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13.781 lbs / 6.251 Kg = 127,6 x 6,0 " / 152 mm shells or 1,7 torpedoes
Stability (Unstable if below 1.00): 1,51
Metacentric height 3,8 ft / 1,2 m
Roll period: 11,3 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0,09
Seaboat quality (Average = 1.00): 1,00

Hull form characteristics:
Hull has raised forecastle, low quarterdeck
Block coefficient: 0,550
Length to Beam Ratio: 11,00 : 1
'Natural speed' for length: 24,03 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 18,50 degrees
Stern overhang: 13,12 ft / 4,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26,44 ft / 8,06 m
- Forecastle (20 %): 18,04 ft / 5,50 m (13,12 ft / 4,00 m aft of break)
- Mid (50 %): 16,40 ft / 5,00 m
- Quarterdeck (15 %): 9,84 ft / 3,00 m (16,40 ft / 5,00 m before break)
- Stern: 9,84 ft / 3,00 m
- Average freeboard: 15,93 ft / 4,85 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 86,7 %
- Above water (accommodation/working, high = better): 115,9 %
Waterplane Area: 21.154 Square feet or 1.965 Square metres
Displacement factor (Displacement / loading): 139 %
Structure weight / hull surface area: 86 lbs/sq ft or 419 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,05
- Longitudinal: 1,00
- Overall: 1,01
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate

No, breech-loading guns are definitely the correct choice for a 6" battery, particularly in the 1920s. 6" / 15cm ammunition is large enough that it requires multiple-piece ammunition (shell, bagged charges, etc). Quick-firing guns should usually (exceptions may occur) be limited to ordnance firing single-piece ammunition.

Post 1940s, 6" could end up with single-piece ammunition, but in these cases the guns would have to feature fully automatic operation due to the weight, meaning that "Automatic" would be more appropriate.

The one major thing I note about the armament is that all of the main guns are marked as 'raised', ie, superfiring. Additionally, they're all placed in single deck mounts on the centerline. For a cruiser in the WWI era, this layout would be suitable, but by 1925 it would be rather obsolete.

I'd suggest, instead, placing your 6" guns in three mount-and-hoist mountings, with two raised guns (in other words, a single superfiring turret), laid out "centerline ends, fore>aft". This gives you a much more modern layout, with better firing arcs and more deck room.

The use of coal, and the high cruising speed, does really take a lot of space in this design. At 10,000 tons standard displacement, I feel you should have plenty of budget for a fourth 6" twin turret and some modest secondaries (perhaps 4" QF). Perhaps try converting the design to oil-fired, and knock the cruise speed down to 5500nm @ 18 knots. That's quite respectable even for someone like the Royal Navy, needing lots of range to patrol the Empire.

Overall, this is a pretty respectable first design.

I see. Thanks you. This is much better now.

The new new and double improved SNF Corvus:

SNF Corvus, Enter country light cruiser laid down 1925

Displacement:
8.566 t light; 8.858 t standard; 10.001 t normal; 10.916 t full load

Dimensions: Length overall / water x beam x draught
599,40 ft / 577,43 ft x 52,49 ft x 21,00 ft (normal load)
182,70 m / 176,00 m x 16,00 m x 6,40 m

Armament:
8 - 6,00" / 152 mm guns (4x2 guns), 108,00lbs / 48,99kg shells, 1925 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 3 raised mounts - superfiring
16 - 0,50" / 12,7 mm guns (4x4 guns), 0,06lbs / 0,03kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
6 - 4,00" / 102 mm guns in single mounts, 32,00lbs / 14,51kg shells, 1925 Model
Quick firing guns in deck mounts
on side, evenly spread
Weight of broadside 1.057 lbs / 479 kg
Shells per gun, main battery: 150
4 - 20,0" / 508 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 5,51" / 140 mm 493,44 ft / 150,40 m 8,69 ft / 2,65 m
Ends: 1,57" / 40 mm 83,96 ft / 25,59 m 8,69 ft / 2,65 m
Upper: 3,54" / 90 mm 375,33 ft / 114,40 m 8,01 ft / 2,44 m
Main Belt covers 131 % of normal length

- Torpedo Bulkhead:
2,17" / 55 mm 375,33 ft / 114,40 m 19,26 ft / 5,87 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2,76" / 70 mm - -

- Armour deck: 2,76" / 70 mm, Conning tower: 2,76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 66.312 shp / 49.468 Kw = 30,00 kts
Range 5.500nm at 18,00 kts
Bunker at max displacement = 2.058 tons

Complement:
499 - 650

Cost:
£2,331 million / $9,323 million

Distribution of weights at normal displacement:
Armament: 132 tons, 1,3 %
Armour: 3.177 tons, 31,8 %
- Belts: 1.425 tons, 14,3 %
- Torpedo bulkhead: 579 tons, 5,8 %
- Armament: 66 tons, 0,7 %
- Armour Deck: 1.079 tons, 10,8 %
- Conning Tower: 28 tons, 0,3 %
Machinery: 2.153 tons, 21,5 %
Hull, fittings & equipment: 3.094 tons, 30,9 %
Fuel, ammunition & stores: 1.436 tons, 14,4 %
Miscellaneous weights: 10 tons, 0,1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13.599 lbs / 6.168 Kg = 125,9 x 6,0 " / 152 mm shells or 2,3 torpedoes
Stability (Unstable if below 1.00): 1,28
Metacentric height 3,0 ft / 0,9 m
Roll period: 12,8 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0,30
Seaboat quality (Average = 1.00): 1,02

Hull form characteristics:
Hull has raised forecastle, low quarterdeck
Block coefficient: 0,550
Length to Beam Ratio: 11,00 : 1
'Natural speed' for length: 24,03 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 18,50 degrees
Stern overhang: 13,12 ft / 4,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26,44 ft / 8,06 m
- Forecastle (20 %): 18,04 ft / 5,50 m (13,12 ft / 4,00 m aft of break)
- Mid (50 %): 16,40 ft / 5,00 m
- Quarterdeck (15 %): 9,84 ft / 3,00 m (16,40 ft / 5,00 m before break)
- Stern: 9,84 ft / 3,00 m
- Average freeboard: 15,93 ft / 4,85 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 130,7 %
- Above water (accommodation/working, high = better): 115,9 %
Waterplane Area: 21.154 Square feet or 1.965 Square metres
Displacement factor (Displacement / loading): 117 %
Structure weight / hull surface area: 90 lbs/sq ft or 440 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,02
- Longitudinal: 1,00
- Overall: 1,00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate

I committed one little mistake with the weapons, so here I leave the correction:

Armament:
8 - 6,00" / 152 mm guns (4x2 guns), 108,00lbs / 48,99kg shells, 1925 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
16 - 0,50" / 12,7 mm guns (4x4 guns), 0,06lbs / 0,03kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
6 - 4,00" / 102 mm guns in single mounts, 32,00lbs / 14,51kg shells, 1925 Model
Quick firing guns in deck mounts
on side, evenly spread
Weight of broadside 1.057 lbs / 479 kg
Shells per gun, main battery: 150
4 - 20,0" / 508 mm above water torpedoes