Patrolowiec typu Falster 1935 (3 szt.)

Patrolowiec typu Falster 1935 (3 szt.)

Okręt na bazie zmodernizowanego projektu uniwersalnego PU-450 (PU-450-2). Jednostki tego typu przeznaczone są patrolowania pozostającego w naszym zakresie odpowiedzialności obszaru Bałtyku, a w czasie wojny również do zwalczania OP nieprzyjaciela.

W porównaniu do poprzedniego projektu (PU-450-1) okręty są nieco szersze i mają większe zanurzenie, lecz smuklejsza część podwodna kadłuba pozwoliła na zmieszczenie się w wyporności 450 tn. Poza tym dokonano zmian w uzbrojeniu i architekturze okrętu. Podobnie, jak w przypadku trałowców typu Prypeć, projekt jest „niewyżyłowany” i posiada niewielkie rezerwy ciężarowe.

Patrolowce te posiadają zupełnie wystarczające na Bałtyk właściwości morskie, a stosunkowo duży zasięg i autonomiczność pozwala im na długotrwałe patrolowanie bez zawijania do portu.

Falster, Poland Patrol boat laid down 1935

Displacement:

            310 t light; 321 t standard; 450 t normal; 553 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)

            (201,32 ft / 196,85 ft) x 25,43 ft x (7,55 / 8,66 ft)

            (61,36 m / 60,00 m) x 7,75 m  x (2,30 / 2,64 m)

Armament:

      1 - 2,95" / 75,0 mm 55,0 cal gun - 13,01lbs / 5,90kg shells, 200 per gun

              Dual purpose gun in deck and hoist mount, 1923 Model

              1 x Single mount on centreline, forward deck forward

      3 - 0,98" / 25,0 mm 60,0 cal guns - 0,55lbs / 0,25kg shells, 1 000 per gun

              Anti-air guns in deck mounts, 1933 Model

              1 x Twin mount on centreline, aft deck aft 1 raised mount

              1 x Single mount on centreline, forward deck centre 1 raised mount

      Weight of broadside 15 lbs / 7 kg

      Main DC/AS Mortars

      2 - 246,92 lbs / 112,00 kg Depth Charges + 16 reloads - 1,984 t total

            in Stern depth charge racks

      2nd DC/AS Mortars

      2 - 418,88 lbs / 190,00 kg Depth Charges + 16 reloads - 3,366 t total

            in Depth charge throwers

Machinery:

            Diesel Internal combustion motors,

            Geared drive, 2 shafts, 3 400 shp / 2 537 Kw = 21,00 kts

            Range 6 000nm at 14,00 kts

            Bunker at max displacement = 232 tons

Complement:

            48 - 63

Cost:

            £0,134 million / $0,535 million

Distribution of weights at normal displacement:

            Armament: 13 tons, 2,9%

               - Guns: 6 tons, 1,3%

               - Weapons: 8 tons, 1,7%

            Machinery: 97 tons, 21,5%

            Hull, fittings & equipment: 200 tons, 44,5%

            Fuel, ammunition & stores: 140 tons, 31,1%

            Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:

            Survivability (Non-critical penetrating hits needed to sink ship):

              1 063 lbs / 482 Kg = 82,6 x 3,0 " / 75 mm shells or 0,7 torpedoes

            Stability (Unstable if below 1.00): 1,33

            Metacentric height 1,1 ft / 0,3 m

            Roll period: 10,3 seconds

            Steadiness      - As gun platform (Average = 50 %): 75 %

                                   - Recoil effect (Restricted arc if above 1.00): 0,07

            Seaboat quality  (Average = 1.00): 1,36

Hull form characteristics:

            Hull has rise forward of midbreak,

              a normal bow and large transom stern

            Block coefficient (normal/deep): 0,417 / 0,446

            Length to Beam Ratio: 7,74 : 1

            'Natural speed' for length: 16,56 kts

            Power going to wave formation at top speed: 61 %

            Trim (Max stability = 0, Max steadiness = 100): 55

            Bow angle (Positive = bow angles forward): 16,50 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%,  15,09 ft / 4,60 m,  14,11 ft / 4,30 m

               - Forward deck:       30,00%,  14,11 ft / 4,30 m,  14,11 ft / 4,30 m

               - Aft deck:    30,00%,  5,91 ft / 1,80 m,  5,91 ft / 1,80 m

               - Quarter deck:        20,00%,  5,91 ft / 1,80 m,  5,91 ft / 1,80 m

               - Average freeboard:                      10,09 ft / 3,07 m

            Ship tends to be wet forward

Ship space, strength and comments:

            Space - Hull below water (magazines/engines, low = better): 74,6%

                        - Above water (accommodation/working, high = better): 128,4%

            Waterplane Area: 3 233 Square feet or 300 Square metres

            Displacement factor (Displacement / loading): 213%

            Structure weight / hull surface area: 36 lbs/sq ft or 177 Kg/sq metre

            Hull strength (Relative):

                        - Cross-sectional: 0,91

                        - Longitudinal: 3,77

                        - Overall: 1,05

            Excellent machinery, storage, compartmentation space

            Excellent accommodation and workspace room

            Ship has slow, easy roll, a good, steady gun platform

            Good seaboat, rides out heavy weather easily

Falster (1935)

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