Exploration Cutter

[ledeper]

Aurora Borealis, Baltic Confederation Exploration-cutter laid down 1909

Displacement:
   540 t light; 552 t standard; 580 t normal; 603 t full load

Dimensions: Length overall / water x beam x draught
   191,62 ft / 190,29 ft x 29,53 ft x 5,58 ft (normal load)
   58,41 m / 58,00 m x 9,00 m  x 1,70 m

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 550 ihp / 410 Kw = 12,00 kts
   Range 3.500nm at 6,00 kts
   Bunker at max displacement = 51 tons (100% coal)

Complement:
   58 - 76

Cost:
   £0,032 million / $0,126 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0,0 %
   Machinery: 90 tons, 15,5 %
   Hull, fittings & equipment: 200 tons, 34,5 %
   Fuel, ammunition & stores: 40 tons, 6,9 %
   Miscellaneous weights: 250 tons, 43,1 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     934 lbs / 424 Kg = 8,6 x 6 " / 152 mm shells or 0,5 torpedoes
   Stability (Unstable if below 1.00): 1,09
   Metacentric height 0,9 ft / 0,3 m
   Roll period: 12,7 seconds
   Steadiness   - As gun platform (Average = 50 %): 95 %
         - Recoil effect (Restricted arc if above 1.00): 0,00
   Seaboat quality  (Average = 1.00): 1,91

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,648
   Length to Beam Ratio: 6,44 : 1
   'Natural speed' for length: 13,79 kts
   Power going to wave formation at top speed: 39 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 5,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15,19 ft / 4,63 m
      - Forecastle (20 %):   9,65 ft / 2,94 m
      - Mid (50 %):      9,65 ft / 2,94 m
      - Quarterdeck (15 %):   9,65 ft / 2,94 m
      - Stern:      9,65 ft / 2,94 m
      - Average freeboard:   10,09 ft / 3,08 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 97,6 %
      - Above water (accommodation/working, high = better): 134,1 %
   Waterplane Area: 4.234 Square feet or 393 Square metres
   Displacement factor (Displacement / loading): 135 %
   Structure weight / hull surface area: 33 lbs/sq ft or 161 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,92
      - Longitudinal: 2,05
      - 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
   Excellent seaboat, comfortable, rides out heavy weather easily