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Tuesday, April 22nd 2008, 2:37am

Modified Struma-class MSW

The next version of Bulgaria's minesweepers.

Quoted

Modified Struma, Bulgarian Minesweeper laid down 1936

Displacement:
494 t light; 511 t standard; 579 t normal; 634 t full load

Dimensions: Length overall / water x beam x draught
197.75 ft / 194.00 ft x 27.00 ft x 9.00 ft (normal load)
60.27 m / 59.13 m x 8.23 m x 2.74 m

Armament:
2 - 3.46" / 88.0 mm guns (1x2 guns), 20.79lbs / 9.43kg shells, 1936 Model
Dual purpose guns in deck mount
on centreline forward
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1936 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
2 - 0.79" / 20.0 mm guns (1x2 guns), 0.24lbs / 0.11kg shells, 1936 Model
Anti-aircraft guns in deck mount
on centreline forward, all raised guns - superfiring
4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1936 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 45 lbs / 21 kg
Shells per gun, main battery: 200

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm - -

- Conning tower: 0.98" / 25 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2,828 shp / 2,110 Kw = 19.00 kts
Range 5,000nm at 12.00 kts
Bunker at max displacement = 122 tons

Complement:
58 - 76

Cost:
£0.175 million / $0.700 million

Distribution of weights at normal displacement:
Armament: 6 tons, 1.0 %
Armour: 4 tons, 0.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.3 %
Machinery: 79 tons, 13.7 %
Hull, fittings & equipment: 225 tons, 38.9 %
Fuel, ammunition & stores: 85 tons, 14.7 %
Miscellaneous weights: 180 tons, 31.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
967 lbs / 439 Kg = 46.5 x 3.5 " / 88 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 0.8 ft / 0.2 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.09
Seaboat quality (Average = 1.00): 1.73

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.430
Length to Beam Ratio: 7.19 : 1
'Natural speed' for length: 13.93 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 29
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 14.00 ft / 4.27 m
- Forecastle (20 %): 11.00 ft / 3.35 m
- Mid (50 %): 11.00 ft / 3.35 m
- Quarterdeck (15 %): 11.00 ft / 3.35 m
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 11.24 ft / 3.43 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 86.6 %
- Above water (accommodation/working, high = better): 118.8 %
Waterplane Area: 3,289 Square feet or 306 Square metres
Displacement factor (Displacement / loading): 149 %
Structure weight / hull surface area: 36 lbs/sq ft or 177 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.85
- Longitudinal: 4.62
- Overall: 1.01
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Kaiser Kirk

Lightbringer and former European Imperialist

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2

Wednesday, April 23rd 2008, 7:41am

Looks pretty good, nice speed for such a short hull.

3

Wednesday, April 23rd 2008, 5:25pm

Gee, this is about the third toy today I've thought about aquiring (as Turkey). I think I'm turning into Desertfox today or something!

4

Thursday, April 24th 2008, 1:21am

Bulgaria would of course be willing to share the design with Turkey.