Habsburg Minesweeper 1909

[Borys]

Ahoj!
The war showed the need for minesweepers to be able to "go places".
So here is the ocean going minesweeper ...

M-7, Habsburgs Minesweeper laid down 1909

Displacement:
   473 t light; 491 t standard; 621 t normal; 726 t full load

Dimensions: Length overall / water x beam x draught
   190,00 ft / 190,00 ft x 26,00 ft x 7,00 ft (normal load)
   57,91 m / 57,91 m x 7,92 m  x 2,13 m

Armament:
      2 - 4,00" / 102 mm guns in single mounts, 32,00lbs / 14,51kg shells, 1909 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread, 1 raised mount
      2 - 0,43" / 11,0 mm guns in single mounts, 0,04lbs / 0,02kg shells, 1909 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 64 lbs / 29 kg
   Shells per gun, main battery: 150

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 2 102 ihp / 1 568 Kw = 17,00 kts
   Range 3 500nm at 12,00 kts
   Bunker at max displacement = 235 tons (100% coal)

Complement:
   61 - 80

Cost:
   £0,046 million / $0,184 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 1,3%
   Machinery: 162 tons, 26,0%
   Hull, fittings & equipment: 203 tons, 32,7%
   Fuel, ammunition & stores: 149 tons, 23,9%
   Miscellaneous weights: 100 tons, 16,1%
The various minesweeping thingies, with room for imoprovement

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     711 lbs / 322 Kg = 22,2 x 4,0 " / 102 mm shells or 0,4 torpedoes
   Stability (Unstable if below 1.00): 1,28
   Metacentric height 1,0 ft / 0,3 m
   Roll period: 10,7 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0,13
   Seaboat quality  (Average = 1.00): 1,57

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0,629
   Length to Beam Ratio: 7,31 : 1
   'Natural speed' for length: 13,78 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   Bow angle (Positive = bow angles forward): 0,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      16,00 ft / 4,88 m
      - Forecastle (20%):   15,00 ft / 4,57 m (9,00 ft / 2,74 m aft of break)
      - Mid (50%):      9,00 ft / 2,74 m
      - Quarterdeck (15%):   9,00 ft / 2,74 m
      - Stern:      9,00 ft / 2,74 m
      - Average freeboard:   10,28 ft / 3,13 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 112,0%
      - Above water (accommodation/working, high = better): 104,3%
   Waterplane Area: 3 712 Square feet or 345 Square metres
   Displacement factor (Displacement / loading): 127%
   Structure weight / hull surface area: 33 lbs/sq ft or 162 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,89
      - Longitudinal: 2,82
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[P3D]

Where did I see sg similar? ;)

http://www.navalism.org/index.php?topic=1394.msg13449#msg13449

[Borys]

Ahoj!
Yes, similar.
As it is to do a smilar job ...
Borys