Trałowiec typu Nysa 1926-1927 (4 szt.)

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)