Corvettes

[Korpen]

Jäger-class, Netherlands Corvette laid down 1901 (Engine 1905)
Groen Jager
Zwarte jager
Roode Jager


Displacement:
   2 547 t light; 2 626 t standard; 3 080 t normal; 3 443 t full load

Dimensions: Length overall / water x beam x draught
   354,43 ft / 344,49 ft x 42,65 ft x 17,06 ft (normal load)
   108,03 m / 105,00 m x 13,00 m  x 5,20 m

Armament:
      3 - 4,72" / 120 mm guns in single mounts, 52,91lbs / 24,00kg shells, 1901 Model
     Quick firing guns in deck mounts
     on centreline ends, majority aft, 1 raised mount aft
      2 - 3,46" / 88,0 mm guns in single mounts, 19,84lbs / 9,00kg shells, 1901 Model
     Quick firing guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
   Weight of broadside 198 lbs / 90 kg
   Shells per gun, main battery: 150
   8 - 17,7" / 450 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,98" / 25 mm         -               -
   2nd:   0,98" / 25 mm         -               -

   - Conning tower: 0,98" / 25 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 19 000 shp / 14 173 Kw = 25,08 kts
   Range 4 050nm at 12,00 kts
   Bunker at max displacement = 817 tons (90% coal)

Complement:
   206 - 268

Cost:
   £0,321 million / $1,285 million

Distribution of weights at normal displacement:
   Armament: 25 tons, 0,8 %
   Armour: 16 tons, 0,5 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 11 tons, 0,4 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 4 tons, 0,1 %
   Machinery: 1 509 tons, 49,0 %
   Hull, fittings & equipment: 947 tons, 30,8 %
   Fuel, ammunition & stores: 533 tons, 17,3 %
   Miscellaneous weights: 50 tons, 1,6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1 485 lbs / 674 Kg = 28,2 x 4,7 " / 120 mm shells or 0,5 torpedoes
   Stability (Unstable if below 1.00): 1,63
   Metacentric height 3,1 ft / 1,0 m
   Roll period: 10,1 seconds
   Steadiness   - As gun platform (Average = 50 %): 66 %
         - Recoil effect (Restricted arc if above 1.00): 0,06
   Seaboat quality  (Average = 1.00): 1,29

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0,430
   Length to Beam Ratio: 8,08 : 1
   'Natural speed' for length: 18,56 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 51
   Bow angle (Positive = bow angles forward): 25,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      21,33 ft / 6,50 m
      - Forecastle (20 %):   19,69 ft / 6,00 m
      - Mid (30 %):      19,69 ft / 6,00 m (11,48 ft / 3,50 m aft of break)
      - Quarterdeck (15 %):   11,48 ft / 3,50 m
      - Stern:      11,48 ft / 3,50 m
      - Average freeboard:   14,07 ft / 4,29 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 166,4 %
      - Above water (accommodation/working, high = better): 79,7 %
   Waterplane Area: 9 226 Square feet or 857 Square metres
   Displacement factor (Displacement / loading): 91 %
   Structure weight / hull surface area: 60 lbs/sq ft or 294 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,92
      - Longitudinal: 2,12
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Good seaboat, rides out heavy weather easily


Post Rebuild:

Jäger-class, Netherlands Corvette laid down 1901 (Engine 1909)

Displacement:
   2 540 t light; 2 624 t standard; 3 080 t normal; 3 444 t full load

Dimensions: Length overall / water x beam x draught
   354,43 ft / 344,49 ft x 42,65 ft x 17,06 ft (normal load)
   108,03 m / 105,00 m x 13,00 m  x 5,20 m

Armament:
      4 - 4,72" / 120 mm guns in single mounts, 52,91lbs / 24,00kg shells, 1901 Model
     Quick firing guns in deck mounts with hoists
     on centreline ends, evenly spread, 2 raised mounts - superfiring
      2 - 3,46" / 88,0 mm guns in single mounts, 19,84lbs / 9,00kg shells, 1901 Model
     Quick firing guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
   Weight of broadside 251 lbs / 114 kg
   Shells per gun, main battery: 150

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,98" / 25 mm         -               -
   2nd:   0,98" / 25 mm         -               -

   - Conning tower: 0,98" / 25 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 28 000 shp / 20 888 Kw = 27,55 kts
   Range 6 940nm at 12,00 kts
   Bunker at max displacement = 821 tons

Complement:
   206 - 268

Cost:
   £0,294 million / $1,174 million

Distribution of weights at normal displacement:
   Armament: 32 tons, 1,0 %
   Armour: 18 tons, 0,6 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 14 tons, 0,5 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 4 tons, 0,1 %
   Machinery: 1 273 tons, 41,3 %
   Hull, fittings & equipment: 1 037 tons, 33,7 %
   Fuel, ammunition & stores: 539 tons, 17,5 %
   Miscellaneous weights: 180 tons, 5,8 %
               -145t mines (or other cargo)
               -35t radio (one large, one small)
Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1 751 lbs / 794 Kg = 33,2 x 4,7 " / 120 mm shells or 0,5 torpedoes
   Stability (Unstable if below 1.00): 1,35
   Metacentric height 2,4 ft / 0,7 m
   Roll period: 11,7 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0,15
   Seaboat quality  (Average = 1.00): 1,00

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0,430
   Length to Beam Ratio: 8,08 : 1
   'Natural speed' for length: 18,56 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 51
   Bow angle (Positive = bow angles forward): 25,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      21,33 ft / 6,50 m
      - Forecastle (20 %):   19,69 ft / 6,00 m
      - Mid (36 %):      19,69 ft / 6,00 m (11,48 ft / 3,50 m aft of break)
      - Quarterdeck (15 %):   11,48 ft / 3,50 m
      - Stern:      11,48 ft / 3,50 m
      - Average freeboard:   14,57 ft / 4,44 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 148,0 %
      - Above water (accommodation/working, high = better): 115,2 %
   Waterplane Area: 9 226 Square feet or 857 Square metres
   Displacement factor (Displacement / loading): 103 %
   Structure weight / hull surface area: 65 lbs/sq ft or 317 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,90
      - Longitudinal: 2,35
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is adequate