Prezentowałem już wcześniej dwa warianty kanonierek typu
flat-iron dla naszej floty. Ponieważ jednak mam do tych niepozornych okręcików
sporą słabość, to postanowiłem przysporzyć flocie kolejne – tym razem są to
jednostki z naprawdę sporym działem, bo aż 11 calowym (279 mm) – największym na ten
czas w całej flocie. Międzynarodowych rekordów w tej materii akurat nie biją
(bo były też kanonierki z działami po 400 mm) ale według stanu na 1878 r. mamy tu i
tak jeden z największych kalibrów w tej klasie okrętów (większy miały chyba
tylko niemieckie jednostki typu Wespe, wodowane od 1876 r., których do 1881 r.
zbudowano aż 11).
Poniżej rysunek naszej nowej kanonierki w dwóch wariantach
malowania oraz raport ze Springsharpa:
Harpia, polish flat-iron gunboat laid down 1878
Displacement:
313 t light; 340 t standard; 366 t normal; 386 t full load
Dimensions: Length overall / water x beam x draught
121,19 ft / 119,69 ft x 26,31 ft x 7,15 ft (normal load)
36,94 m / 36,48 m x 8,02 m x 2,18 m
Armament:
1 - 10,98" / 279 mm guns in single mounts, 543,37lbs / 246,47kg shells, 1878 Model
Breech loading gun in casemate mount
on bow with limited arc
Main guns limited to end-on fire
Weight of broadside 543 lbs / 246 kg
Shells per gun, main battery: 65
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,98" / 25 mm - -
Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 2 shafts, 366 ihp / 273 Kw = 11,00 kts
Range 1 400nm at 7,50 kts
Bunker at max displacement = 46 tons (100% coal)
Complement:
41 - 54
Cost:
£0,074 million / $0,296 million
Distribution of weights at normal displacement:
Armament: 68 tons, 18,6%
Armour: 7 tons, 2,0%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 7 tons, 2,0%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 44 tons, 11,9%
Hull, fittings & equipment: 194 tons, 53,1%
Fuel, ammunition & stores: 53 tons, 14,4%
Miscellaneous weights: 0 tons, 0,0%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
142 lbs / 64 Kg = 0,3 x 11,0 " / 279 mm shells or 0,1 torpedoes
Stability (Unstable if below 1.00): 1,58
Metacentric height 1,5 ft / 0,4 m
Roll period: 9,1 seconds
Steadiness - As gun platform (Average = 50 %): 78 %
- Recoil effect (Restricted arc if above 1.00): 0,73
Seaboat quality (Average = 1.00): 1,57
Hull form characteristics:
Hull has low forecastle
Block coefficient: 0,568
Length to Beam Ratio: 4,55 : 1
'Natural speed' for length: 10,94 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 1,51 ft / 0,46 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 3,54 ft / 1,08 m
- Forecastle (17%): 4,49 ft / 1,37 m (9,48 ft / 2,89 m aft of break)
- Mid (50%): 6,00 ft / 1,83 m
- Quarterdeck (25%): 6,50 ft / 1,98 m
- Stern: 6,99 ft / 2,13 m
- Average freeboard: 6,52 ft / 1,99 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 172,5%
- Above water (accommodation/working, high = better): 73,8%
Waterplane Area: 2 235 Square feet or 208 Square metres
Displacement factor (Displacement / loading): 52%
Structure weight / hull surface area: 62 lbs/sq ft or 302 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,84
- Longitudinal: 4,60
- Overall: 1,00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
Harpia (1878)
Tryton (1879)
Cerber (1879)
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