Brandenburger Minensuchen 1918

[Sachmle]

I currently possess 13 minesweepers. They were all built in 1907-08 and it was decided to provide some newer, longer ranged sweepers to augment this core. (Based on the RL  KM M1916 Minensuchen)

M1918, Brandenburger Minensuchen laid down 1918 (Engine 1916)

Displacement:
   415 t light; 435 t standard; 527 t normal; 600 t full load

Dimensions: Length overall / water x beam x draught
   194.55 ft / 189.14 ft x 23.95 ft x 7.05 ft (normal load)
   59.30 m / 57.65 m x 7.30 m  x 2.15 m

Armament:
      2 - 4.13" / 105 mm guns in single mounts, 35.27lbs / 16.00kg shells, 1908 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1918 Model
     Quick firing guns in deck mounts
     on side, all amidships
      2 - 0.30" / 7.7 mm guns (1x2 guns), 0.01lbs / 0.01kg shells, 1918 Model
     Machine guns in deck mount
     on centreline amidships, all raised guns - superfiring
   Weight of broadside 74 lbs / 33 kg
   Shells per gun, main battery: 225

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 1,850 ihp / 1,380 Kw = 17.05 kts
   Range 2,000nm at 14.00 kts
   Bunker at max displacement = 165 tons (100% coal)

Complement:
   54 - 71

Cost:
   £0.078 million / $0.314 million

Distribution of weights at normal displacement:
   Armament: 9 tons, 1.8 %
   Machinery: 121 tons, 23.0 %
   Hull, fittings & equipment: 230 tons, 43.7 %
   Fuel, ammunition & stores: 112 tons, 21.2 %
   Miscellaneous weights: 55 tons, 10.4 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     913 lbs / 414 Kg = 25.8 x 4.1 " / 105 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.22
   Metacentric height 0.8 ft / 0.3 m
   Roll period: 11.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.21
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.577
   Length to Beam Ratio: 7.90 : 1
   'Natural speed' for length: 13.75 kts
   Power going to wave formation at top speed: 56 %
   Trim (Max stability = 0, Max steadiness = 100): 25
   Bow angle (Positive = bow angles forward): 12.40 degrees
   Stern overhang: -2.46 ft / -0.75 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      24.61 ft / 7.50 m
      - Forecastle (20 %):   18.04 ft / 5.50 m
      - Mid (50 %):      16.40 ft / 5.00 m (8.20 ft / 2.50 m aft of break)
      - Quarterdeck (15 %):   8.20 ft / 2.50 m
      - Stern:      8.20 ft / 2.50 m
      - Average freeboard:   13.40 ft / 4.09 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 100.3 %
      - Above water (accommodation/working, high = better): 141.4 %
   Waterplane Area: 3,243 Square feet or 301 Square metres
   Displacement factor (Displacement / loading): 142 %
   Structure weight / hull surface area: 31 lbs/sq ft or 151 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.78
      - Longitudinal: 9.06
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

30t Mines
25t Minesweeping Gear