Okręt hydrograficzny typu Bałtyk 1920 (1 szt.)
Rozważania pt. „co od
Niemców brać?” jeszcze chwilę mogą potrwać. W tzw. „międzyczasie” pojawił się w
naszej flocie nieduży, ale pożyteczny okręt. Jest to jednostka hydrograficzna
przeznaczona do prac pomiarowych i kartograficznych, wytyczania i oznakowywania
torów wodnych oraz ewentualnie trałowania przeszkód podwodnych. Wielkość okrętu
predestynuje go do działań głównie na Bałtyku, większa jednostka (lub jednostki)
do prac w koloniach planowana jest na najbliższe lata. Mimo swojej, raczej
pokojowej funkcji okręt jest uzbrojony, w czasie wojny istnieje możliwość
montażu zrzutni bomb głębinowych lub wykorzystanie jednostki w charakterze
pomocniczego trałowca.
Bałtyk, Poland Survey ship laid down 1920
Displacement:
554 t
light; 567 t standard; 597 t normal; 621 t full load
Dimensions: Length overall / water x beam x draught
185,14
ft / 183,73 ft x 26,25 ft x 7,87 ft (normal load)
56,43 m
/ 56,00 m x 8,00 m x 2,40 m
Armament:
1 -
2,95" / 75,0 mm guns in single mounts, 14,11lbs / 6,40kg shells, 1910
Model
Quick firing gun in deck mount on centreline
forward
1 - 0,98" / 25,0 mm guns in single
mounts, 0,55lbs / 0,25kg shells, 1919 Model
Anti-aircraft gun in deck mount on centreline
amidships, 1 raised gun
Weight
of broadside 15 lbs / 7 kg
Shells
per gun, main battery: 150
Machinery:
Diesel
Internal combustion motors,
Geared
drive, 2 shafts, 927 shp / 691 Kw = 14,00 kts
Range
4 500nm at 8,00 kts
Bunker
at max displacement = 54 tons
Complement:
59 - 78
Cost:
£0,060
million / $0,239 million
Distribution of weights at normal displacement:
Armament:
2 tons, 0,3%
Machinery:
32 tons, 5,4%
Hull,
fittings & equipment: 514 tons, 86,1%
Fuel,
ammunition & stores: 43 tons, 7,2%
Miscellaneous
weights: 6 tons, 1,0%
Overall survivability and seakeeping ability:
Survivability
(Non-critical penetrating hits needed to sink ship):
3 155 lbs / 1 431 Kg = 245,1 x 3,0
" / 75 mm shells or 3,1 torpedoes
Stability
(Unstable if below 1.00): 1,12
Metacentric
height 0,8 ft / 0,3 m
Roll
period: 12,1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
-
Recoil effect (Restricted arc if above 1.00): 0,02
Seaboat
quality (Average = 1.00): 1,56
Hull form characteristics:
Hull has
rise forward of midbreak, raised quarterdeck
Block
coefficient: 0,550
Length
to Beam Ratio: 7,00 : 1
'Natural
speed' for length: 13,55 kts
Power
going to wave formation at top speed: 48 %
Trim
(Max stability = 0, Max steadiness = 100): 45
Bow
angle (Positive = bow angles forward): 6,00 degrees
Stern
overhang: 0,00 ft / 0,00 m
Freeboard
(% = measuring location as a percentage of overall length):
- Stem: 13,45
ft / 4,10 m
- Forecastle (13%): 12,47 ft / 3,80 m
- Mid (60%): 12,47
ft / 3,80 m (4,92 ft / 1,50 m aft of break)
- Quarterdeck (0%): 4,92 ft / 1,50 m (0,00 ft / 0,00 m before break)
- Stern: 4,92
ft / 1,50 m
- Average freeboard: 8,52 ft / 2,60 m
Ship
tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low =
better): 22,7%
-
Above water (accommodation/working, high = better): 85,5%
Waterplane
Area: 3 365 Square feet or 313 Square metres
Displacement
factor (Displacement / loading): 709%
Structure
weight / hull surface area: 99 lbs/sq ft or 484 Kg/sq metre
Hull
strength (Relative):
-
Cross-sectional: 2,85
-
Longitudinal: 5,82
-
Overall: 3,06
Hull
space for machinery, storage, compartmentation is excellent
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
