Pierwsza przymiarka do krążownika podwodnego

Pierwsza przymiarka do krążownika podwodnego

Poniżej wstępny raport dotyczący - budzącego tak burzliwą dyskusję - podwodnego krążownika.

Prócz 16 torped w wyrzutniach, okręt zabierałby dodatkowo 14 torped zapasowych. Ewentualna opcja 13 wyrzutni + 17 torped w zapasie. Czas zanurzenia szacuję na 45 s. Niepokoi trochę niewielki zasięg pod wodą, ale taka „krowa” musi generować duże opory. Spróbuję zwiększyć pojemność baterii akumulatorów, to z kolei zmniejszy głębokości zanurzenia. Można ewentualnie zwiększyć zasięg podwodny kosztem nawodnego. Duże rozmiary jednostki korzystnie wpłynęły na właściwości morskie.

Rekin, Poland Submarine laid down 1927

Displacement:

            2 041 t light; 2 097 t standard; 2 566(3 019) t normal; 2 942 t full load

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

            (379,22 ft / 377,30 ft) x 31,50 ft x (21,00 / 22,84 ft)

            (115,59 m / 115,00 m) x 9,60 m  x (6,40 / 6,96 m)

Armament:

      2 - 4,13" / 105 mm 45,0 cal guns - 33,29lbs / 15,10kg shells, 120 per gun

              Dual purpose guns in deck mounts, 1921 Model

              2 x Single mounts on centreline, evenly spread

      1 - 1,57" / 40,0 mm 60,0 cal gun - 2,05lbs / 0,93kg shells, 480 per gun

              Anti-air gun in deck mount, 1919 Model

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

      2 - 0,98" / 25,0 mm 60,0 cal guns - 0,55lbs / 0,25kg shells, 1 000 per gun

              Anti-air guns in deck mount, 1919 Model

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

      Weight of broadside 70 lbs / 32 kg

      Main Torpedoes

      10 - 21,0" / 533 mm, 27,33 ft / 8,33 m torpedoes - 1,762 t each, 17,619 t total

            submerged bow & stern tubes

      2nd Torpedoes

      6 - 21,0" / 533 mm, 27,33 ft / 8,33 m torpedoes - 1,762 t each, 10,572 t total

            In 2 sets of deck mounted centre rotating tubes

Machinery:

            Diesel Internal combustion generators plus batteries,

            Electric motors, 2 shafts, 8 230(1 622) shp / 6 140(1 210) Kw = 21,00(10,00) kts

            Range 16 500(85)nm at 10,00(5,00) kts

            Bunker at max displacement = 766 tons

Complement:

            103

Cost:

            £0,812 million / $3,248 million

Distribution of weights at normal displacement:

            Armament: 71 tons, 2,8%

               - Guns: 15 tons, 0,6%

               - Weapons: 56 tons, 2,2%

            Machinery: 260 tons, 10,1%

            Hull, fittings & equipment: 1 257 tons, 49,0%

            Fuel, ammunition & stores: 526 tons, 20,5%

            Miscellaneous weights: 453 tons, 17,7%

               - Hull below water: 453 tons

Overall survivability and seakeeping ability:

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

              3 869 lbs / 1 755 Kg = 64,8 x 4,1 " / 105 mm shells or 0,5 torpedoes

            Stability (Unstable if below 1.00): 1,19

            Metacentric height 1,2 ft / 0,4 m

            Roll period: 12,0 seconds

            Steadiness      - As gun platform (Average = 50 %): 74 %

                                   - Recoil effect (Restricted arc if above 1.00): 0,06

            Seaboat quality  (Average = 1.00): 1,23

Hull form characteristics:

            Hull has a flush deck,

              a normal bow and a round stern

            Block coefficient (normal/deep): 0,360 / 0,379

            Length to Beam Ratio: 11,98 : 1

            'Natural speed' for length: 19,42 kts

            Power going to wave formation at top speed: 35 %

            Trim (Max stability = 0, Max steadiness = 100): 60

            Bow angle (Positive = bow angles forward): 9,00 degrees

            Stern overhang: 0,00 ft / 0,00 m

            Freeboard (% = length of deck as a percentage of waterline length):

                                               Fore end,        Aft end

               - Forecastle:            15,00%,  12,14 ft / 3,70 m,  10,50 ft / 3,20 m

               - Forward deck:       35,00%,  10,50 ft / 3,20 m,  10,50 ft / 3,20 m

               - Aft deck:    35,00%,  10,50 ft / 3,20 m,  10,50 ft / 3,20 m

               - Quarter deck:        15,00%,  10,50 ft / 3,20 m,  0,98 ft / 0,30 m

               - Average freeboard:                      9,88 ft / 3,01 m

            Ship tends to be wet forward

Ship space, strength and comments:

            Space - Hull below water (magazines/engines, low = better): 66,3%

                        - Above water (accommodation/working, high = better): 60,0%

            Waterplane Area: 7 133 Square feet or 663 Square metres

            Displacement factor (Displacement / loading): 255%

            Structure weight / hull surface area: 88 lbs/sq ft or 428 Kg/sq metre

            Hull strength (Relative):

                        - Cross-sectional: 1,60

                        - Longitudinal: 2,81

                        - Overall: 1,69

            Excellent machinery, storage, compartmentation space

            Cramped accommodation and workspace room

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

            Good seaboat, rides out heavy weather easily

Operational diving deepth 84 m

Emergency diving deepth 135 m

Crush deepth 211 m