Habsburg Minesweeper for the second decade of the century

[Borys]

M7, Oesterreich-Ungran Minesweeper laid down 1909

Displacement:
   604 t light; 627 t standard; 818 t normal; 970 t full load

Dimensions: Length overall / water x beam x draught
   180,00 ft / 180,00 ft x 34,00 ft x 7,00 ft (normal load)
   54,86 m / 54,86 m x 10,36 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
      2 - 0,43" / 11,0 mm guns in single mounts, 0,04lbs / 0,02kg shells, 1909 Model
     Machine guns in deck mounts
     on side, all amidships
   Weight of broadside 64 lbs / 29 kg
   Shells per gun, main battery: 200

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 3 161 ihp / 2 358 Kw = 17,50 kts
   Range 4 000nm at 12,00 kts
   Bunker at max displacement = 342 tons (100% coal)

Complement:
   76 - 99

Cost:
   £0,062 million / $0,248 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 1,0%
   Machinery: 243 tons, 29,7%
   Hull, fittings & equipment: 278 tons, 34,0%
   Fuel, ammunition & stores: 214 tons, 26,1%
   Miscellaneous weights: 75 tons, 9,2%

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1 066 lbs / 483 Kg = 33,3 x 4,0 " / 102 mm shells or 0,5 torpedoes
   Stability (Unstable if below 1.00): 1,41
   Metacentric height 1,8 ft / 0,6 m
   Roll period: 10,6 seconds
   Steadiness   - As gun platform (Average = 50 %): 64 %
         - Recoil effect (Restricted arc if above 1.00): 0,05
   Seaboat quality  (Average = 1.00): 1,27

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0,668
   Length to Beam Ratio: 5,29 : 1
   'Natural speed' for length: 13,42 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   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:      19,00 ft / 5,79 m
      - Forecastle (25%):   18,00 ft / 5,49 m
      - Mid (30%):      18,00 ft / 5,49 m (10,61 ft / 3,23 m aft of break)
      - Quarterdeck (15%):   10,61 ft / 3,23 m
      - Stern:      10,61 ft / 3,23 m
      - Average freeboard:   12,93 ft / 3,94 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 114,4%
      - Above water (accommodation/working, high = better): 134,1%
   Waterplane Area: 4 766 Square feet or 443 Square metres
   Displacement factor (Displacement / loading): 131%
   Structure weight / hull surface area: 38 lbs/sq ft or 186 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,85
      - Longitudinal: 4,21
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Good seaboat, rides out heavy weather easily

[The Rock Doctor]

Why not knock half a knot off of her?  The internal arrangements will no longer be "cramped", so her resistance to flooding will be improved.  Not a bad thing if something goes "boom" in the vicinity.

[Borys]

Better?
M7, Oesterreich-Ungarn Minesweeper laid down 1909

Displacement:
   590 t light; 613 t standard; 799 t normal; 948 t full load

Dimensions: Length overall / water x beam x draught
   180,00 ft / 180,00 ft x 34,00 ft x 7,00 ft (normal load)
   54,86 m / 54,86 m x 10,36 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
      2 - 0,43" / 11,0 mm guns in single mounts, 0,04lbs / 0,02kg shells, 1909 Model
     Machine guns in deck mounts
     on side, all amidships
   Weight of broadside 64 lbs / 29 kg
   Shells per gun, main battery: 200

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 2 736 ihp / 2 041 Kw = 17,00 kts
   Range 4 000nm at 12,00 kts
   Bunker at max displacement = 336 tons (100% coal)

Complement:
   74 - 97

Cost:
   £0,057 million / $0,227 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 1,0%
   Machinery: 210 tons, 26,3%
   Hull, fittings & equipment: 281 tons, 35,2%
   Fuel, ammunition & stores: 210 tons, 26,2%
   Miscellaneous weights: 90 tons, 11,3%
Can carry 24 mines, and a w/t
No idea how much minesweeping things weight

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1 220 lbs / 554 Kg = 38,1 x 4,0 " / 102 mm shells or 0,6 torpedoes
   Stability (Unstable if below 1.00): 1,34
   Metacentric height 1,7 ft / 0,5 m
   Roll period: 11,1 seconds
   Steadiness   - As gun platform (Average = 50 %): 75 %
         - Recoil effect (Restricted arc if above 1.00): 0,06
   Seaboat quality  (Average = 1.00): 1,51

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0,653
   Length to Beam Ratio: 5,29 : 1
   'Natural speed' for length: 13,42 kts
   Power going to wave formation at top speed: 63 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   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:      20,00 ft / 6,10 m
      - Forecastle (25%):   19,00 ft / 5,79 m
      - Mid (30%):      19,00 ft / 5,79 m (11,00 ft / 3,35 m aft of break)
      - Quarterdeck (15%):   11,00 ft / 3,35 m
      - Stern:      11,00 ft / 3,35 m
      - Average freeboard:   13,50 ft / 4,11 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 105,9%
      - Above water (accommodation/working, high = better): 141,2%
   Waterplane Area: 4 701 Square feet or 437 Square metres
   Displacement factor (Displacement / loading): 139%
   Structure weight / hull surface area: 38 lbs/sq ft or 185 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,84
      - Longitudinal: 4,92
      - 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, can fire her guns in the heaviest weather

[The Rock Doctor]

About 20% better.