The RSAN can either provide a version of the 1,600ts DD27-class (traded her original 127mm SP guns against 110mm DPs and added some misc weight) or the DL28-class of 2,000ts (traded her original 115mm SPs for 110mm DPs and added 15ts misc weight). All those hulls easily match the Polish specifications.
DD27-P, Polish Destroyer laid down 1927
Displacement:
1.614 t light; 1.678 t standard; 1.910 t normal; 2.096 t full load
Dimensions: Length overall / water x beam x draught
373,55 ft / 359,25 ft x 36,09 ft x 13,22 ft (normal load)
113,86 m / 109,50 m x 11,00 m x 4,03 m
Armament:
5 - 4,33" / 110 mm guns in single mounts, 40,61lbs / 18,42kg shells, 1927 Model
Dual purpose guns in deck mounts
on centreline ends, majority forward, 2 raised mounts - superfiring
4 - 1,57" / 40,0 mm guns (2x2 guns), 1,95lbs / 0,88kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on side, all amidships
4 - 0,79" / 20,0 mm guns (2x2 guns), 0,24lbs / 0,11kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 212 lbs / 96 kg
Shells per gun, main battery: 210
6 - 21,0" / 533 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,79" / 20 mm 0,39" / 10 mm -
2nd: 0,59" / 15 mm - -
3rd: 0,39" / 10 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 43.325 shp / 32.321 Kw = 35,00 kts
Range 5.000nm at 15,00 kts
Bunker at max displacement = 418 tons
Complement:
143 - 187
Cost:
£0,817 million / $3,267 million
Distribution of weights at normal displacement:
Armament: 26 tons, 1,4%
Armour: 9 tons, 0,5%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 9 tons, 0,5%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 1.042 tons, 54,5%
Hull, fittings & equipment: 527 tons, 27,6%
Fuel, ammunition & stores: 296 tons, 15,5%
Miscellaneous weights: 10 tons, 0,5%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
492 lbs / 223 Kg = 12,1 x 4,3 " / 110 mm shells or 0,3 torpedoes
Stability (Unstable if below 1.00): 1,42
Metacentric height 2,0 ft / 0,6 m
Roll period: 10,7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,14
Seaboat quality (Average = 1.00): 1,00
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0,390
Length to Beam Ratio: 9,95 : 1
'Natural speed' for length: 21,97 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 70
Bow angle (Positive = bow angles forward): 30,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24,77 ft / 7,55 m
- Forecastle (30%): 18,54 ft / 5,65 m
- Mid (50%): 18,54 ft / 5,65 m (10,76 ft / 3,28 m aft of break)
- Quarterdeck (15%): 10,76 ft / 3,28 m
- Stern: 10,76 ft / 3,28 m
- Average freeboard: 15,40 ft / 4,69 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 187,6%
- Above water (accommodation/working, high = better): 101,6%
Waterplane Area: 8.238 Square feet or 765 Square metres
Displacement factor (Displacement / loading): 64%
Structure weight / hull surface area: 33 lbs/sq ft or 162 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,50
- Longitudinal: 1,95
- Overall: 0,57
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
DL28-2000-P, Polish Flotilla Leader laid down 1928
Displacement:
1.994 t light; 2.083 t standard; 2.422 t normal; 2.692 t full load
Dimensions: Length overall / water x beam x draught
426,78 ft / 410,11 ft x 39,37 ft x 13,12 ft (normal load)
130,08 m / 125,00 m x 12,00 m x 4,00 m
Armament:
8 - 4,33" / 110 mm guns (4x2 guns), 40,61lbs / 18,42kg shells, 1928 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
10 - 1,57" / 40,0 mm guns (5x2 guns), 1,95lbs / 0,88kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
12 - 0,79" / 20,0 mm guns (8 mounts), 0,24lbs / 0,11kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 347 lbs / 158 kg
Shells per gun, main battery: 200
8 - 21,0" / 533 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,79" / 20 mm 0,59" / 15 mm -
3rd: 0,59" / 15 mm - -
4th: 0,39" / 10 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 45.576 shp / 34.000 Kw = 34,67 kts
Range 6.400nm at 15,00 kts
Bunker at max displacement = 609 tons
Complement:
172 - 224
Cost:
£1,059 million / $4,235 million
Distribution of weights at normal displacement:
Armament: 43 tons, 1,8%
Armour: 17 tons, 0,7%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 17 tons, 0,7%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 1.222 tons, 50,4%
Hull, fittings & equipment: 677 tons, 28,0%
Fuel, ammunition & stores: 427 tons, 17,6%
Miscellaneous weights: 35 tons, 1,4%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
630 lbs / 286 Kg = 15,5 x 4,3 " / 110 mm shells or 0,3 torpedoes
Stability (Unstable if below 1.00): 1,31
Metacentric height 2,0 ft / 0,6 m
Roll period: 11,7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,35
Seaboat quality (Average = 1.00): 1,00
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0,400
Length to Beam Ratio: 10,42 : 1
'Natural speed' for length: 23,34 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 70
Bow angle (Positive = bow angles forward): 35,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23,82 ft / 7,26 m
- Forecastle (30%): 19,36 ft / 5,90 m
- Mid (45%): 19,36 ft / 5,90 m (11,48 ft / 3,50 m aft of break)
- Quarterdeck (15%): 11,48 ft / 3,50 m
- Stern: 11,48 ft / 3,50 m
- Average freeboard: 15,56 ft / 4,74 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 178,6%
- Above water (accommodation/working, high = better): 102,6%
Waterplane Area: 10.314 Square feet or 958 Square metres
Displacement factor (Displacement / loading): 75%
Structure weight / hull surface area: 37 lbs/sq ft or 180 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,50
- Longitudinal: 1,27
- Overall: 0,55
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