Commonwealth of Russia: Auxillaries: Icebreakers

[Blooded]

Tiaga Class, Russian Commonwealth Icebreaker laid down 1920

Displacement:
   1,310 t light; 1,358 t standard; 2,263 t normal; 2,987 t full load

Dimensions: Length overall / water x beam x draught
   229.67 ft / 220.00 ft x 40.00 ft x 18.00 ft (normal load)
   70.00 m / 67.06 m x 12.19 m  x 5.49 m

Armament:
      2 - 2.95" / 75.0 mm guns in single mounts, 10.80lbs / 4.90kg shells, 1920 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread, all raised mounts
      2 - 1.85" / 47.0 mm guns in single mounts, 3.30lbs / 1.50kg shells, 1920 Model
     Quick firing guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
   Weight of broadside 28 lbs / 13 kg
   Shells per gun, main battery: 120

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Ends:   Unarmoured

   - Torpedo Bulkhead:
      1.50" / 38 mm   220.00 ft / 67.06 m   22.00 ft / 6.71 m

Machinery:
   Diesel Internal combustion motors,
   Geared drive, 2 shafts, 6,000 shp / 4,476 Kw = 18.46 kts
   Range 25,520nm at 12.00 kts
   Bunker at max displacement = 1,629 tons

Complement:
   163 - 213

Cost:
   £0.186 million / $0.743 million

Distribution of weights at normal displacement:
   Armament: 4 tons, 0.2 %
   Armour: 269 tons, 11.9 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 269 tons, 11.9 %
      - Armament: 0 tons, 0.0 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 210 tons, 9.3 %
   Hull, fittings & equipment: 528 tons, 23.3 %
   Fuel, ammunition & stores: 952 tons, 42.1 %
   Miscellaneous weights: 300 tons, 13.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5,261 lbs / 2,386 Kg = 408.7 x 3.0 " / 75 mm shells or 2.2 torpedoes
   Stability (Unstable if below 1.00): 1.29
   Metacentric height 2.0 ft / 0.6 m
   Roll period: 11.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 72 %
         - Recoil effect (Restricted arc if above 1.00): 0.02
   Seaboat quality  (Average = 1.00): 1.40

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.500
   Length to Beam Ratio: 5.50 : 1
   'Natural speed' for length: 14.83 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 51
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 6.50 ft / 1.98 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      18.00 ft / 5.49 m
      - Forecastle (20 %):   14.00 ft / 4.27 m
      - Mid (50 %):      12.00 ft / 3.66 m
      - Quarterdeck (15 %):   13.00 ft / 3.96 m
      - Stern:      15.00 ft / 4.57 m
      - Average freeboard:   13.50 ft / 4.11 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 94.3 %
      - Above water (accommodation/working, high = better): 87.2 %
   Waterplane Area: 5,863 Square feet or 545 Square metres
   Displacement factor (Displacement / loading): 222 %
   Structure weight / hull surface area: 51 lbs/sq ft or 251 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.85
      - Longitudinal: 4.10
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Cost: $1.31 /1.31BP

TB represents stronger hull for icebreaking

Misc Weight(300+705):
25 Tons LR Wireless
50 Tons Aircraft Facilities
25 Tons Aircraft Hanger
25 Tons Seaplane
50 Tons Special Fittings
100 Tons Accomedations
25 Tons Reserve

505 Tons Cargo(as fuel load)
200 Tons Ballast (as fuel load)

Actual Range: 200 Tons Diesel=8600@10