Esc Light Cruisers of 1920/2

[ledeper]

Lc 30-, Esc Enter ship type laid down 1920

Displacement:
   8.162 t light; 8.436 t standard; 9.367 t normal; 10.113 t full load

Dimensions: Length overall / water x beam x draught
   531,69 ft / 524,93 ft x 72,18 ft x 20,51 ft (normal load)
   162,06 m / 160,00 m x 22,00 m  x 6,25 m

Armament:
     8 - 5,91" / 150 mm guns (4x2 guns), 102,98lbs / 46,71kg shells, 1920 Model
     Quick firing guns in deck mounts with hoists
     on centreline, evenly spread, 2 raised mounts
     Aft Main mounts separated by engine room
     2 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1920 Model
     Anti-aircraft guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
     6 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1920 Model
     Anti-aircraft guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 990 lbs / 449 kg
   Shells per gun, main battery: 150
   4 - 19,7" / 500 mm above water torpedoes

Armour:
  - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4,72" / 120 mm   319,23 ft / 97,30 m   18,04 ft / 5,50 m
   Ends:   Unarmoured
     Main Belt covers 94 % of normal length

  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3,94" / 100 mm   1,97" / 50 mm            -
   2nd:   0,39" / 10 mm         -               -

  - Armour deck: 1,97" / 50 mm, Conning tower: 3,94" / 100 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 65.945 shp / 49.195 Kw = 30,00 kts
   Range 8.000nm at 14,00 kts
   Bunker at max displacement = 1.677 tons

Complement:
   475 - 618

Cost:
   £1,684 million / $6,736 million

Distribution of weights at normal displacement:
   Armament: 124 tons, 1,3 %
   Armour: 2.161 tons, 23,1 %
      - Belts: 1.175 tons, 12,5 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 87 tons, 0,9 %
      - Armour Deck: 861 tons, 9,2 %
      - Conning Tower: 38 tons, 0,4 %
   Machinery: 2.306 tons, 24,6 %
   Hull, fittings & equipment: 3.322 tons, 35,5 %
   Fuel, ammunition & stores: 1.206 tons, 12,9 %
   Miscellaneous weights: 250 tons, 2,7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     11.942 lbs / 5.417 Kg = 116,0 x 5,9 " / 150 mm shells or 1,9 torpedoes
   Stability (Unstable if below 1.00): 1,25
   Metacentric height 4,6 ft / 1,4 m
   Roll period: 14,2 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0,13
   Seaboat quality  (Average = 1.00): 1,00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,422
   Length to Beam Ratio: 7,27 : 1
   'Natural speed' for length: 22,91 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 71
   Bow angle (Positive = bow angles forward): 10,00 degrees
   Stern overhang: 3,28 ft / 1,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      19,69 ft / 6,00 m
      - Forecastle (10 %):   15,78 ft / 4,81 m
      - Mid (50 %):      15,78 ft / 4,81 m
      - Quarterdeck (15 %):   15,78 ft / 4,81 m
      - Stern:      15,78 ft / 4,81 m
      - Average freeboard:   15,94 ft / 4,86 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 93,5 %
      - Above water (accommodation/working, high = better): 140,1 %
   Waterplane Area: 23.655 Square feet or 2.198 Square metres
   Displacement factor (Displacement / loading): 117 %
   Structure weight / hull surface area: 100 lbs/sq ft or 486 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,96
      - Longitudinal: 1,39
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform

Torpedoes 100 tns(5 reloads) or 100 mines
FC  100tns
L/R W/L 25 tns
Reserve 25 tns

3 will be laid down.

[Sachmle]

Seems a lot of AA considering more CLs were sunk by things not planes than things that are planes so far. I'd ditch 4 of the 88s and see if another twin 15 could be worked in.

[Jefgte]

I note :
- The heavy belt protection for a CL &... no barbette armor ( ? )
- 120mm belt is good for heavier cruisers with 8"or 9" guns.
- 22m, beam is confortable & the Seaboat quality is just 1,00...short



IMO, finaly 8162T is too much for 4T2x6" @ 30kts in 1920.


Jef

[Jefgte]

Test a kind of Ajax...
8)

Jef

[Jefgte]

LED,  Light Cruiser laid down 1920 (Engine 1916)

Displacement:
   7 000 t light; 7 279 t standard; 8 281 t normal; 9 082 t full load

Dimensions: Length overall / water x beam x draught
   555.23 ft / 551.18 ft x 59.06 ft x 19.19 ft (normal load)
   169.23 m / 168.00 m x 18.00 m  x 5.85 m

Armament:
      8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1920 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, evenly spread, 2 raised mounts - superfiring
      8 - 3.00" / 76.2 mm guns (4x2 guns), 13.50lbs / 6.12kg shells, 1920 Model
     Quick firing guns in deck mounts
     on side, evenly spread
      4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.89kg shells, 1920 Model
     Quick firing guns in deck mounts
     on side ends, evenly spread, all raised mounts
      4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1920 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 980 lbs / 445 kg
   Shells per gun, main battery: 200
   6 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.15" / 80 mm   367.45 ft / 112.00 m   13.32 ft / 4.06 m
   Ends:   1.57" / 40 mm   131.23 ft / 40.00 m   8.01 ft / 2.44 m
     52.49 ft / 16.00 m Unarmoured ends
     Main Belt covers 103 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm   0.79" / 20 mm      1.97" / 50 mm
   2nd:   0.79" / 20 mm         -               -
   3rd:   0.79" / 20 mm         -               -
   4th:   0.50" / 13 mm         -               -

   - Armour deck: 1.57" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 59 158 shp / 44 132 Kw = 30.00 kts
   Range 8 000nm at 14.00 kts
   Bunker at max displacement = 1 803 tons

Complement:
   433 - 564

Cost:
   £1.552 million / $6.207 million

Distribution of weights at normal displacement:
   Armament: 123 tons, 1.5 %
   Armour: 1 395 tons, 16.9 %
      - Belts: 703 tons, 8.5 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 53 tons, 0.6 %
      - Armour Deck: 612 tons, 7.4 %
      - Conning Tower: 28 tons, 0.3 %
   Machinery: 2 204 tons, 26.6 %
   Hull, fittings & equipment: 3 008 tons, 36.3 %
   Fuel, ammunition & stores: 1 281 tons, 15.5 %
   Miscellaneous weights: 270 tons, 3.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     9 920 lbs / 4 500 Kg = 91.9 x 6.0 " / 152 mm shells or 1.4 torpedoes
   Stability (Unstable if below 1.00): 1.24
   Metacentric height 3.4 ft / 1.0 m
   Roll period: 13.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 72 %
         - Recoil effect (Restricted arc if above 1.00): 0.26
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.464
   Length to Beam Ratio: 9.33 : 1
   'Natural speed' for length: 23.48 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      22.97 ft / 7.00 m
      - Forecastle (18 %):   19.69 ft / 6.00 m
      - Mid (50 %):      16.40 ft / 5.00 m
      - Quarterdeck (17 %):   16.40 ft / 5.00 m
      - Stern:      16.40 ft / 5.00 m
      - Average freeboard:   17.76 ft / 5.41 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 102.1 %
      - Above water (accommodation/working, high = better): 138.9 %
   Waterplane Area: 21 007 Square feet or 1 952 Square metres
   Displacement factor (Displacement / loading): 117 %
   Structure weight / hull surface area: 91 lbs/sq ft or 447 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.30
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform

[mentat]

With the heavy vertical protection - they are definitely in the Bruiser category - able to stand and fight at quite close range

Seems good design to me - except the Barbettes + poss Freeboard + Skpg a bit low

Some reason for the combination of Moderate Speed (30 knots) + Firepower - but Heavy Protection ??

- and given emphasis on Protection - considered Turrets?

[ledeper]

UPS:

6 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1920 Model
     Anti-aircraft guns in deck mounts

It should be 40mm AA,so;and as of barbettes it requires BB 20 Tech,as I originally wanted 3x3 150 mm guns so this is a compromise :

BB/AC Architecture - Main battery in turrets
1920:  No restriction (high or low) on caliber of turreted guns

Lc 30-, Esc Enter ship type laid down 1920

Displacement:
   8.092 t light; 8.353 t standard; 9.279 t normal; 10.020 t full load

Dimensions: Length overall / water x beam x draught
   531,69 ft / 524,93 ft x 72,18 ft x 20,51 ft (normal load)
   162,06 m / 160,00 m x 22,00 m  x 6,25 m

Armament:
      8 - 5,91" / 150 mm guns (4x2 guns), 102,98lbs / 46,71kg shells, 1920 Model
     Quick firing guns in deck mounts with hoists
     on centreline, evenly spread, 2 raised mounts
     Aft Main mounts separated by engine room
      2 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1920 Model
     Anti-aircraft guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
      6 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,89kg shells, 1920 Model
     Anti-aircraft guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 877 lbs / 398 kg
   Shells per gun, main battery: 150
   4 - 19,7" / 500 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4,72" / 120 mm   319,23 ft / 97,30 m   18,04 ft / 5,50 m
   Ends:   Unarmoured
     Main Belt covers 94 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3,94" / 100 mm   1,97" / 50 mm      3,94" / 100 mm
   2nd:   0,39" / 10 mm         -               -

   - Armour deck: 1,97" / 50 mm, Conning tower: 3,94" / 100 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 65.403 shp / 48.790 Kw = 30,00 kts
   Range 8.000nm at 14,00 kts
   Bunker at max displacement = 1.667 tons

Complement:
   472 - 614

Cost:
   £1,644 million / $6,575 million

Distribution of weights at normal displacement:
   Armament: 110 tons, 1,2 %
   Armour: 2.164 tons, 23,3 %
      - Belts: 1.174 tons, 12,7 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 93 tons, 1,0 %
      - Armour Deck: 859 tons, 9,3 %
      - Conning Tower: 37 tons, 0,4 %
   Machinery: 2.287 tons, 24,6 %
   Hull, fittings & equipment: 3.282 tons, 35,4 %
   Fuel, ammunition & stores: 1.186 tons, 12,8 %
   Miscellaneous weights: 250 tons, 2,7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     11.944 lbs / 5.418 Kg = 116,0 x 5,9 " / 150 mm shells or 1,9 torpedoes
   Stability (Unstable if below 1.00): 1,24
   Metacentric height 4,6 ft / 1,4 m
   Roll period: 14,2 seconds
   Steadiness   - As gun platform (Average = 50 %): 72 %
         - Recoil effect (Restricted arc if above 1.00): 0,12
   Seaboat quality  (Average = 1.00): 1,01

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,418
   Length to Beam Ratio: 7,27 : 1
   'Natural speed' for length: 22,91 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 71
   Bow angle (Positive = bow angles forward): 10,00 degrees
   Stern overhang: 3,28 ft / 1,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      19,69 ft / 6,00 m
      - Forecastle (10 %):   15,78 ft / 4,81 m
      - Mid (50 %):      15,78 ft / 4,81 m
      - Quarterdeck (15 %):   15,78 ft / 4,81 m
      - Stern:      15,78 ft / 4,81 m
      - Average freeboard:   15,94 ft / 4,86 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 92,6 %
      - Above water (accommodation/working, high = better): 140,6 %
   Waterplane Area: 23.589 Square feet or 2.191 Square metres
   Displacement factor (Displacement / loading): 118 %
   Structure weight / hull surface area: 99 lbs/sq ft or 482 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,96
      - Longitudinal: 1,39
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform

Torpedoes 100 tns(5 reloads) or 100 mines
FC  100tns
L/R W/L 25 tns
Reserve 25 tns