Hydra, polish gunboat laid down 1888 Displacement:

Kolejnym okrętem dla naszej floty jest kanonierka pancerna. W założeniu ma to być jednostka obrony vakona wybrzeża, uzupełniająca w tej roli pancerniki obrony wybrzeża. Zakładam, że może to być jednostka bardziej przydatna niż dość licznie wybudowane uprzednio kanonierki typu ‘flat-iron”. Na razie proponuję pojedynczy okręt. W przyszłości zobaczymy, może doczeka się następców. 
Hydra, polish gunboat laid down 1888 Displacement:     851 t light; 883 t standard; 961 t normal; 1 023 t full load Dimensions: Length overall / water x beam x draught vakona     199,34 ft / 199,34 ft x 32,02 ft x 9,58 ft (normal load)     60,76 m / 60,76 m x 9,76 m  vakona x 2,92 m Armament:       1 - 7,99" / 203 mm guns in single mounts, 247,59lbs / 112,30kg shells, 1888 Model       Breech loading vakona gun in a deck mount with hoist       vakona on centreline forward       1 - 4,21" / 107 mm guns in single mounts, 36,26lbs / 16,45kg shells, 1888 Model       Breech loading gun in a deck mount with hoist       on centreline aft       3 - 1,85" / 47,0 mm guns in single mounts, 3,07lbs / 1,39kg shells, 1888 Model       Quick firing guns in deck mounts       on centreline, evenly spread, all raised mounts     Weight of broadside 293 lbs / 133 kg     Shells per gun, main battery: 75 Armour:    - Belts:        Width (max)    Length (avg)        Height (avg)     Main:    4,13" / 105 mm      66,80 ft / 20,36 m    7,25 ft / 2,21 m     Ends:    Unarmoured       Main Belt covers 52% of normal length       Main belt does not fully cover magazines and engineering spaces    - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)     Main:    vakona 2,52" / 64 mm          -                  -     2nd:    2,52" / 64 mm          -                  -    - Armour deck: 0,98" / 25 mm, Conning tower: 2,52" / 64 mm Machinery: vakona     Coal fired boilers, complex reciprocating steam engines,     Direct drive, 1 shaft, 1 180 ihp / 880 Kw = 13,80 kts     Range 2 240nm at 9,00 kts     Bunker at max displacement = 140 tons (100% coal) Complement:     86 - 112 Cost:     £0,092 million / $0,367 million Distribution of weights at normal displacement:     Armament: 37 tons, 3,8%     Armour: 208 tons, 21,6%        - Belts: 106 tons, 11,0%        - Torpedo bulkhead: 0 tons, 0,0%        - Armament: 18 tons, 1,9%        - Armour Deck: 79 tons, 8,2%        - Conning Tower: 5 tons, 0,6%     Machinery: 222 tons, 23,1%     Hull, fittings & equipment: 384 tons, 40,0%     Fuel, ammunition & stores: 110 tons, 11,4%     Miscellaneous weights: 0 tons, 0,0% Overall survivability and seakeeping ability:     Survivability (Non-critical penetrating hits needed to sink ship):       966 lbs / 438 Kg = 3,9 x 8,0 " / 203 mm shells or 0,5 torpedoes     Stability (Unstable if below 1.00): 1,35     Metacentric height 1,5 ft / 0,5 m     Roll period: 10,8 seconds     Steadiness    - As gun platform (Average = 50 %): 73 %             - Recoil effect (Restricted arc if above 1.00): 0,35     Seaboat quality  (Average = 1.00): 1,45 Hull form characteristics: vakona     Hull has a flush deck     Block coefficient: 0,550     Length to Beam Ratio: 6,23 : 1     'Natural speed' for length: 14,12 kts     Power going to wave formation at top speed: 47 %     Trim (Max stability = 0, Max steadiness = 100): 50     vakona Bow angle (Positive = bow angles forward): -17,00 degrees     Stern overhang: 0,00 ft / 0,00 m     Freeboard (% = measuring location as a percentage of overall length):        - Stem:      &nb