Trałowiec typu Nysa 1926-1927 (4 szt.)
Drugi typ
okrętów na bazie projektu uniwersalnego PU-900. Tym razem jest to pełnomorski
trałowiec z możliwością postawienia 30 min.
Jednostka
charakteryzuje się świetnymi właściwościami morskimi, dużym zasięgiem i
tradycyjnie już silnym uzbrojeniem plot.
Okręt
przeznaczony jest do trałowania akwenów oddalonych od baz macierzystych oraz do
towarzyszenia konwojom w rejonach narażonych na zaminowanie.
Przeznaczone
dotychczas do tych zadań trałowce typu Narew
(MSC-16 1922) zostają teraz skierowane do bazy w Portus Regius na Pembie i będą
obsługiwały nasze posiadłości zamorskie.
Nysa, Poland Minesweeper laid down 1926
Displacement:
614
t light; 640 t standard; 899 t normal; 1 107 t full load
Dimensions: Length (overall / waterline) x
beam x draught (normal/deep)
(253,27
ft / 250,98 ft) x 29,53 ft x (10,33 / 11,88 ft)
(77,20
m / 76,50 m) x 9,00 m x (3,15 / 3,62 m)
Armament:
2
- 4,13" / 105 mm 50,0 cal guns - 33,29lbs / 15,10kg shells, 150 per gun
Dual purpose guns in deck and hoist mounts,
1921 Model
2 x Single mounts on centreline ends, evenly
spread
2
- 1,57" / 40,0 mm 60,0 cal guns - 2,05lbs / 0,93kg shells, 600 per gun
Anti-air guns in deck mount, 1919 Model
1 x Twin mount on centreline, aft deck centre
1 raised mount
4
- 0,98" / 25,0 mm 60,0 cal guns - 0,55lbs / 0,25kg shells, 1 200 per
gun
Anti-air guns in deck mounts, 1919 Model
4 x Single mounts on sides, aft deck forward 4
raised mounts
1
- 0,51" / 13,0 mm 75,0 cal gun - 0,11lbs / 0,05kg shells, 2 400 per
gun
Machine gun in deck mount, 1925 Model
1 x Single mount on centreline, forward deck centre
1 raised mount
Weight of broadside 72 lbs / 32 kg
Mines
2
- 1 212,54 lbs / 550,00 kg mines + 30 reloads - 17,322 t total
in
Above water - Stern racks/rails
Machinery:
Diesel
Internal combustion motors,
Direct
drive, 2 shafts, 6 084 shp / 4 538 Kw = 22,50 kts
Range
8 900nm at 14,00 kts
Bunker
at max displacement = 467 tons
Complement:
81
- 106
Cost:
£0,198
million / $0,793 million
Distribution of weights at normal
displacement:
Armament:
48 tons, 5,3%
- Guns: 26 tons, 2,9%
- Weapons: 22 tons, 2,4%
Machinery:
195 tons, 21,7%
Hull,
fittings & equipment: 341 tons, 37,9%
Fuel,
ammunition & stores: 286 tons, 31,8%
Miscellaneous
weights: 30 tons, 3,3%
- Hull above water: 10 tons
- On freeboard deck: 20 tons
Overall survivability and seakeeping ability:
Survivability
(Non-critical penetrating hits needed to sink ship):
1 641 lbs / 744 Kg = 46,4 x 4,1 " /
105 mm shells or 0,8 torpedoes
Stability
(Unstable if below 1.00): 1,34
Metacentric
height 1,4 ft / 0,4 m
Roll
period: 10,7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
-
Recoil effect (Restricted arc if above 1.00): 0,17
Seaboat
quality (Average = 1.00): 1,41
Hull form characteristics:
Hull
has rise forward of midbreak,
a normal bow and small transom stern
Block
coefficient (normal/deep): 0,411 / 0,440
Length
to Beam Ratio: 8,50 : 1
'Natural
speed' for length: 17,25 kts
Power
going to wave formation at top speed: 58 %
Trim
(Max stability = 0, Max steadiness = 100): 50
Bow
angle (Positive = bow angles forward): 7,50 degrees
Stern
overhang: 0,00 ft / 0,00 m
Freeboard
(% = length of deck as a percentage of waterline length):
Fore
end, Aft end
- Forecastle: 20,00%, 17,39 ft /
5,30 m, 15,75 ft / 4,80 m
- Forward deck: 20,00%, 15,75 ft / 4,80
m, 15,75 ft / 4,80 m
- Aft deck: 40,00%, 7,87 ft / 2,40 m, 7,87 ft / 2,40 m
- Quarter deck: 20,00%, 7,87 ft / 2,40
m, 7,87 ft / 2,40 m
- Average freeboard: 11,15 ft / 3,40 m
Ship
tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low =
better): 81,2%
-
Above water (accommodation/working, high = better): 116,0%
Waterplane
Area: 4 697 Square feet or 436 Square metres
Displacement
factor (Displacement / loading): 179%
Structure
weight / hull surface area: 43 lbs/sq ft or 211 Kg/sq metre
Hull
strength (Relative):
-
Cross-sectional: 0,89
-
Longitudinal: 2,78
-
Overall: 1,00
Excellent
machinery, storage, compartmentation space
Adequate
accommodation and workspace room
Ship
has slow, easy roll, a good, steady gun platform
Good
seaboat, rides out heavy weather easily
Nysa (1926)
Łyna (1926)
Prut (1927)
Seret (1927)
