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
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.
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
About 20% better.