Niderlandzkie trałowce typu IJsel 1929 (4 jednostki)

Niderlandzkie trałowce typu IJsel 1929 (4 jednostki)

Pełnomorskie trałowce przeznaczone do wykonywania zadań poza akwenami przybrzeżnymi. Zasięg i dzielność morska umożliwiają im udział w eskorcie konwojów. Okręt może zabierać do 28 min, a po demontażu torów minowych istnieje możliwość montażu dwu zrzutni bomb głębinowych z zapasem 24 bg. Na stałe, jednostki stacjonować będą w metropolii.

Wszystkie okręty typu zostały zbudowane w stoczni A.F. Smulders w Schiedam.

Opis techniczny.

Kadłub

Pełne kształty oraz wysoka wolna burta zapewniają wysoką dzielność morską.

Napęd

Dwa kotły olejowe Cockerill w jednej kotłowni i dwie maszyny parowe potrójnego rozprężania Burgerhout w jednej maszynowni.

Uzbrojenie

- 1xIx105/50 P1924, przy elewacji maksymalnej 30^o donośność pociskiem HE 16,00 kg wynosi 14920 m;

- 1xII+2xIx13,2/78 FN P1919.

- opcjonalnie 28 min lub 2xwbg z zapasem 24 bg.

Inne

Okręt został wyposażony w zestaw sprzętu trałowego, dwie radiostacje i szumonamiernik.

IJsel, Netherlands minesweeper laid down 1928, launched 1928, completed 1929 (engine 1928)

Displacement:

            355 t light; 368 t standard; 507 t normal; 618 t full load

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

            (151,32 ft / 147,31 ft) x 25,59 ft x (10,83 / 12,43 ft)

            (46,12 m / 44,90 m) x 7,80 m  x (3,30 / 3,79 m)

Armament:

      1 - 4,13" / 105 mm 50,0 cal gun - 35,27lbs / 16,00kg shells, 120 per gun

              Quick firing gun in deck mount, 1925 Model

              1 x Single mount on centreline, forward deck forward

      4 - 0,52" / 13,2 mm 76,0 cal guns - 0,11lbs / 0,05kg shells, 3 500 per gun

              Machine guns in deck mounts, 1919 Model

              1 x Twin mount on centreline, aft deck aft

              2 x Single mounts on sides, forward deck Centre

                        2 raised mounts

      Weight of broadside 36 lbs / 16 kg

      Mines

      2 - 2 314,85 lbs / 1 050,00 kg mines + 28 reloads - 31,003 t total

            in Above water - Stern racks/rails

      Main DC/AS Mortars

      2 - 396,83 lbs / 180,00 kg Depth Charges + 24 reloads - 4,606 t total

            in Stern depth charge racks

Armour:

   - Gun armour:         Face (max)     Other gunhouse (avg)            Barbette/hoist (max)

            Main:           0,51" / 13 mm                   -                                              -

Machinery:

            Oil fired boilers, complex reciprocating steam engines,

            Direct drive, 2 shafts, 1 800 ihp / 1 343 Kw = 16,19 kts

            Range 6 600nm at 12,00 kts

            Bunker normal 139 tons, at max displacement = 250 tons

Complement:

            53 - 69

Cost:

            £0,111 million / $0,443 million

Distribution of weights at normal displacement:

            Armament: 52 tons, 10,3%

               - Guns: 8 tons, 1,5%

               - Weapons: 45 tons, 8,8%

            Armour: 1 tons, 0,2%

               - Armament: 1 tons, 0,2%

            Machinery: 103 tons, 20,3%

            Hull, fittings & equipment: 172 tons, 33,9%

            Fuel, ammunition & stores: 152 tons, 30,0%

            Miscellaneous weights: 11 tons, 2,2%

               - Hull above water: 5 tons

               - On freeboard deck: 6 tons

Overall survivability and seakeeping ability:

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

              1 006 lbs / 457 Kg = 28,5 x 4,1 " / 105 mm shells or 0,5 torpedoes

            Stability (Unstable if below 1.00): 1,63

            Metacentric height 1,5 ft / 0,4 m

            Roll period: 8,9 seconds

            Steadiness      - As gun platform (Average = 50 %): 80 %

                                   - Recoil effect (Restricted arc if above 1.00): 0,08

            Seaboat quality  (Average = 1.00): 2,00

Hull form characteristics:

            Hull has low quarterdeck ,

              a normal bow and small transom stern

            Block coefficient (normal/deep): 0,435 / 0,462

            Length to Beam Ratio: 5,76 : 1

            'Natural speed' for length: 13,48 kts

            Power going to wave formation at top speed: 61 %

            Trim (Max stability = 0, Max steadiness = 100): 40

            Bow angle (Positive = bow angles forward): 12,10 degrees

            Stern overhang: 0,98 ft / 0,30 m

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

                                                                     Fore end,              Aft end

               - Forecastle:            18,00%,  14,11 ft / 4,30 m,  13,12 ft / 4,00 m

               - Forward deck:       30,00%,  13,12 ft / 4,00 m,  13,12 ft / 4,00 m

               - Aft deck:                30,00%,  13,12 ft / 4,00 m,  13,12 ft / 4,00 m

               - Quarter deck:        22,00%,  4,92 ft / 1,50 m,  4,92 ft / 1,50 m

               - Average freeboard:                      11,39 ft / 3,47 m

Ship space, strength and comments:

            Space - Hull below water (magazines/engines, low = better): 72,0%

                        - Above water (accommodation/working, high = better): 114,7%

            Waterplane Area: 2 431 Square feet or 226 Square metres

            Displacement factor (Displacement / loading): 213%

            Structure weight / hull surface area: 35 lbs/sq ft or 172 Kg/sq metre

            Hull strength (Relative):

                        - Cross-sectional: 0,80

                        - Longitudinal: 9,24

                        - Overall: 1,02

            Excellent machinery, storage, compartmentation space

            Adequate accommodation and workspace room

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

            Excellent seaboat, comfortable, can fire her guns in the heaviest weather

IJsel (1929)

Rijn (1929)

Waal (1929)

Leek (1929)