Proposed design for refit of existing older destroyers
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Z203 class German Destroyer - Refitted As Light Minelayer (Originally laid down 1924)
Displacement: 1,507 t light; 1,554 t standard; 1,680 t normal; 1,780 t full load
Dimensions: Length overall / water x beam x draught
350.07 ft / 350.07 ft x 35.10 ft x 11.81 ft (normal load) [106.70 m / 106.70 m x 10.70 m x 3.60 m]
Armament:
2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1936 Model Dual purpose guns in deck mounts on centreline, all forward, 1 raised mount
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1938 Model Anti-aircraft guns in deck mounts on centreline, all aft, all raised mounts – superfiring
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1928 Model Machine guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 79 lbs / 36 kg
Shells per gun, main battery: 300
3 - 21" / 533 mm above water torpedoes
Armour:
Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.39" / 10 mm -
2nd: 0.59" / 15 mm 0.39" / 10 mm -
3rd: 0.59" / 15 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 34,364 shp / 25,636 Kw = 33.56 kts
Range 4,500nm at 12.00 kts
Bunker at max displacement = 225 tons
Complement: 130 - 170
Cost: £0.570 million / $2.280 million
Distribution of weights at normal displacement:
Armament: 10 tons, 0.6 %
Armour: 6 tons, 0.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 0.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 881 tons, 52.5 %
Hull, fittings & equipment: 510 tons, 30.4 %
Fuel, ammunition & stores: 173 tons, 10.3 %
Miscellaneous weights: 100 tons, 6.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship): 555 lbs / 252 Kg = 15.7 x 4.1 " / 105 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.39
Metacentric height 1.8 ft / 0.6 m
Roll period: 10.9 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.06
Seaboat quality (Average = 1.00): 1.05
Hull form characteristics:
Hull has a flush deck and transom stern
Block coefficient: 0.405
Length to Beam Ratio: 9.97 : 1
'Natural speed' for length: 21.63 kts
Power going to wave formation at top speed: 67 %
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: 20.67 ft / 6.30 m
- Forecastle (20 %): 14.76 ft / 4.50 m
- Mid (50 %): 14.76 ft / 4.50 m
- Quarterdeck (15 %): 14.76 ft / 4.50 m
- Stern: 14.76 ft / 4.50 m
- Average freeboard: 15.24 ft / 4.64 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 180.8 %
- Above water (accommodation/working, high = better): 139.9 %
Waterplane Area: 7,874 Square feet or 732 Square metres
Displacement factor (Displacement / loading): 69 %
Structure weight / hull surface area: 34 lbs/sq ft or 165 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.54
- Longitudinal: 2.08
- Overall: 0.62
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Breakdown of miscellaneous weight:
Mine rails port and starboard (10-tons per; total 20 tons)
Eighty mines (each 1-ton)
This post has been edited 1 times, last edit by "BruceDuncan" (Mar 4th 2011, 3:39pm)