Báid Minelaying

[Logi]

2 Laid Down - 2 Completed
LÉ Baibre
LÉ Bidelia

Baibre Class, Republic of Ireland Armed Minelayer laid down 1905 (Engine 1909)

Displacement:
   2,496 t light; 2,619 t standard; 2,860 t normal; 3,053 t full load

Dimensions: Length overall / water x beam x draught
   309.24 ft / 300.00 ft x 42.20 ft x 19.00 ft (normal load)
   94.26 m / 91.44 m x 12.86 m  x 5.79 m

Armament:
     4 - 8.00" / 203 mm guns (2x2 guns), 256.00lbs / 116.12kg shells, 1905 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread
     4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
     Breech loading guns in deck mounts with hoists
     on side, all amidships
     32 - 0.39" / 10.0 mm guns (8x4 guns), 0.03lbs / 0.01kg shells, 1905 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 1,153 lbs / 523 kg
   Shells per gun, main battery: 100

Armour:
  - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.75" / 70 mm   275.00 ft / 83.82 m   12.00 ft / 3.66 m
   Ends:   Unarmoured
     Main Belt covers 141 % of normal length

  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   2.00" / 51 mm   0.50" / 13 mm      1.00" / 25 mm
   2nd:   1.00" / 25 mm   0.50" / 13 mm            -
   3rd:   0.50" / 13 mm         -               -

  - Armour deck: 0.70" / 18 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 11,469 shp / 8,556 Kw = 22.00 kts
   Range 4,200nm at 10.00 kts
   Bunker at max displacement = 434 tons (90% coal)

Complement:
   195 - 254

Cost:
   £0.287 million / $1.148 million

Distribution of weights at normal displacement:
   Armament: 144 tons, 5.0 %
   Armour: 511 tons, 17.9 %
      - Belts: 358 tons, 12.5 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 51 tons, 1.8 %
      - Armour Deck: 102 tons, 3.6 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 562 tons, 19.6 %
   Hull, fittings & equipment: 1,146 tons, 40.1 %
   Fuel, ammunition & stores: 364 tons, 12.7 %
   Miscellaneous weights: 133 tons, 4.7 %
                - 108t Mines (108)
                -   25t FCS

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,494 lbs / 1,131 Kg = 9.7 x 8.0 " / 203 mm shells or 0.8 torpedoes
   Stability (Unstable if below 1.00): 1.01
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 15.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.97
   Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.416
   Length to Beam Ratio: 7.11 : 1
   'Natural speed' for length: 17.32 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   Bow angle (Positive = bow angles forward): 30.00 degrees
   Stern overhang: -1.00 ft / -0.30 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      16.00 ft / 4.88 m
      - Forecastle (20 %):   13.50 ft / 4.11 m
      - Mid (50 %):      12.00 ft / 3.66 m
      - Quarterdeck (15 %):   12.50 ft / 3.81 m
      - Stern:      13.00 ft / 3.96 m
      - Average freeboard:   12.93 ft / 3.94 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 106.5 %
      - Above water (accommodation/working, high = better): 96.0 %
   Waterplane Area: 7,872 Square feet or 731 Square metres
   Displacement factor (Displacement / loading): 98 %
   Structure weight / hull surface area: 84 lbs/sq ft or 410 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.87
      - Longitudinal: 3.37
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Note:
8"/50 Guns

[Logi]

3 Laid Down - 3 Completed
LÉ Toireasa
LÉ Tullia
LÉ Tara

Toireasa Class, Republic of Ireland Fast Minelayer laid down 1908 (Engine 1909)

-All wear Night Camo-

Displacement:
  2,500 t light; 2,574 t standard; 2,803 t normal; 2,986 t full load

Dimensions: Length overall / water x beam x draught
  393.00 ft / 393.00 ft x 32.80 ft x 18.00 ft (normal load)
  119.79 m / 119.79 m x 10.00 m  x 5.49065 m

Armament:
     10 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1912 Model
    Quick firing guns in deck mounts with hoists
    on side, all amidships
     8 - 0.39" / 10.0 mm guns (4x2 guns), 0.03lbs / 0.01kg shells, 1912 Model
    Machine guns in deck mounts
    on side, all amidships
  Weight of broadside 320 lbs / 145 kg
  Shells per gun, main battery: 100

Machinery:
  Oil fired boilers, steam turbines,
  Direct drive, 2 shafts, 29,177 shp / 21,766 Kw = 29.00 kts
  Range 5,000nm at 10.00 kts
               350nm at 29.00 kts
  Bunker at max displacement = 412 tons

Complement:
  192 - 250

Cost:
  £0.294 million / $1.178 million

Distribution of weights at normal displacement:
  Armament: 40 tons, 1.4 %
  Machinery: 1,239 tons, 44.2 %
  Hull, fittings & equipment: 921 tons, 32.9 %
  Fuel, ammunition & stores: 303 tons, 10.8 %
  Miscellaneous weights: 299 tons, 10.7 %
        -   10t Construction Reserve
        - 241t Mines (241)
        -   25t FCS
        -   25t Radar

Overall survivability and seakeeping ability:
  Survivability (Non-critical penetrating hits needed to sink ship):
    1,038 lbs / 471 Kg = 32.4 x 4.0 " / 102 mm shells or 0.4 torpedoes
  Stability (Unstable if below 1.00): 1.14
  Metacentric height 1.2 ft / 0.4 m
  Roll period: 12.6 seconds
  Steadiness   - As gun platform (Average = 50 %): 50 %
        - Recoil effect (Restricted arc if above 1.00): 0.39
  Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
  Hull has a flush deck
  Block coefficient: 0.423
  Length to Beam Ratio: 11.98 : 1
  'Natural speed' for length: 19.82 kts
  Power going to wave formation at top speed: 55 %
  Trim (Max stability = 0, Max steadiness = 100): 50
  Bow angle (Positive = bow angles forward): -20.00 degrees
  Stern overhang: -2.00 ft / -0.61 m
  Freeboard (% = measuring location as a percentage of overall length):
     - Stem:      16.00 ft / 4.88 m
     - Forecastle (20 %):   13.00 ft / 3.96 m
     - Mid (50 %):      10.00 ft / 3.05 m
     - Quarterdeck (15 %):   11.00 ft / 3.35 m
     - Stern:      11.40 ft / 3.47 m
     - Average freeboard:   11.65 ft / 3.55 m
  Ship tends to be wet forward

Ship space, strength and comments:
  Space   - Hull below water (magazines/engines, low = better): 165.0 %
     - Above water (accommodation/working, high = better): 87.5 %
  Waterplane Area: 8,051 Square feet or 748 Square metres
  Displacement factor (Displacement / loading): 86 %
  Structure weight / hull surface area: 58 lbs/sq ft or 285 Kg/sq metre
  Hull strength (Relative):
     - Cross-sectional: 0.94
     - Longitudinal: 1.61
     - Overall: 1.00
  Hull space for machinery, storage, compartmentation is cramped
  Room for accommodation and workspaces is cramped