Gunboats

[Korpen]

CGB-1, Nederländsk Gunboat laid down 1906 (Engine 1905)
19 ships buiilt
6 ships lost in the war.

Displacement:
   401 t light; 415 t standard; 543 t normal; 645 t full load

Dimensions: Length overall / water x beam x draught
   202,97 ft / 196,85 ft x 32,81 ft x 3,94 ft (normal load)
   61,87 m / 60,00 m x 10,00 m  x 1,20 m

Armament:
      1 - 3,94" / 100 mm guns in single mounts, 37,48lbs / 17,00kg shells, 1906 Model
     Quick firing gun in deck mount
     on centreline aft
      1 - 3,46" / 88,0 mm guns in single mounts, 19,84lbs / 9,00kg shells, 1906 Model
     Quick firing gun in deck mount
     on centreline forward
      4 - 0,31" / 8,0 mm guns in single mounts, 0,02lbs / 0,01kg shells, 1906 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 57 lbs / 26 kg
   Shells per gun, main battery: 95

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,59" / 15 mm         -               -
   2nd:   0,59" / 15 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 1 776 ihp / 1 325 Kw = 16,00 kts
   Range 2 945nm at 12,00 kts
   Bunker at max displacement = 230 tons (100% coal)

Complement:
   56 - 73

Cost:
   £0,053 million / $0,212 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 1,2 %
   Armour: 2 tons, 0,4 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 2 tons, 0,4 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 0 tons, 0,0 %
   Machinery: 240 tons, 44,2 %
   Hull, fittings & equipment: 132 tons, 24,4 %
   Fuel, ammunition & stores: 142 tons, 26,2 %
   Miscellaneous weights: 20 tons, 3,7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     320 lbs / 145 Kg = 10,5 x 3,9 " / 100 mm shells or 0,3 torpedoes
   Stability (Unstable if below 1.00): 1,99
   Metacentric height 2,8 ft / 0,9 m
   Roll period: 8,2 seconds
   Steadiness   - As gun platform (Average = 50 %): 66 %
         - Recoil effect (Restricted arc if above 1.00): 0,03
   Seaboat quality  (Average = 1.00): 1,31

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,747
   Length to Beam Ratio: 6,00 : 1
   'Natural speed' for length: 14,03 kts
   Power going to wave formation at top speed: 52 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   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:      13,12 ft / 4,00 m
      - Forecastle (20 %):   9,84 ft / 3,00 m
      - Mid (50 %):      9,84 ft / 3,00 m
      - Quarterdeck (15 %):   9,84 ft / 3,00 m
      - Stern:      9,84 ft / 3,00 m
      - Average freeboard:   10,10 ft / 3,08 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 155,7 %
      - Above water (accommodation/working, high = better): 180,7 %
   Waterplane Area: 5 397 Square feet or 501 Square metres
   Displacement factor (Displacement / loading): 92 %
   Structure weight / hull surface area: 19 lbs/sq ft or 93 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 1,03
      - Overall: 0,53
   Caution: Hull subject to strain in open-sea
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Good seaboat, rides out heavy weather easily

[Korpen]

GB Type 3, Netherlands Gunboat laid down 1900
Six ships

Displacement:
   688 t light; 718 t standard; 922 t normal; 1 085 t full load

Dimensions: Length overall / water x beam x draught
   209,97 ft / 209,97 ft x 27,89 ft x 10,50 ft (normal load)
   64,00 m / 64,00 m x 8,50 m  x 3,20 m

Armament:
      3 - 3,46" / 88,0 mm guns in single mounts, 19,84lbs / 9,00kg shells, 1900 Model
     Quick firing guns in deck mounts
     on centreline ends, majority aft, 1 raised mount aft
      4 - 1,97" / 50,0 mm guns in single mounts, 3,81lbs / 1,73kg shells, 1900 Model
     Quick firing guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
      6 - 0,31" / 8,0 mm guns in single mounts, 0,02lbs / 0,01kg shells, 1900 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 75 lbs / 34 kg
   Shells per gun, main battery: 250
   2 - 17,7" / 450 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,98" / 25 mm         -               -
   2nd:   0,59" / 15 mm         -               -
   3rd:   0,59" / 15 mm         -               -

   - Conning tower: 2,01" / 51 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 1 904 ihp / 1 420 Kw = 16,00 kts
   Range 4 000nm at 12,00 kts
   Bunker at max displacement = 368 tons (100% coal)

Complement:
   83 - 108

Cost:
   £0,074 million / $0,296 million

Distribution of weights at normal displacement:
   Armament: 10 tons, 1,1 %
   Armour: 12 tons, 1,3 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 8 tons, 0,8 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 4 tons, 0,4 %
   Machinery: 298 tons, 32,3 %
   Hull, fittings & equipment: 329 tons, 35,7 %
   Fuel, ammunition & stores: 234 tons, 25,4 %
   Miscellaneous weights: 40 tons, 4,3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     977 lbs / 443 Kg = 47,0 x 3,5 " / 88 mm shells or 0,4 torpedoes
   Stability (Unstable if below 1.00): 1,23
   Metacentric height 1,1 ft / 0,3 m
   Roll period: 11,3 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0,21
   Seaboat quality  (Average = 1.00): 2,00

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0,525
   Length to Beam Ratio: 7,53 : 1
   'Natural speed' for length: 14,49 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 0,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      19,69 ft / 6,00 m
      - Forecastle (20 %):   18,04 ft / 5,50 m
      - Mid (50 %):      18,04 ft / 5,50 m (9,84 ft / 3,00 m aft of break)
      - Quarterdeck (15 %):   9,84 ft / 3,00 m
      - Stern:      9,84 ft / 3,00 m
      - Average freeboard:   14,07 ft / 4,29 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 118,2 %
      - Above water (accommodation/working, high = better): 103,9 %
   Waterplane Area: 3 992 Square feet or 371 Square metres
   Displacement factor (Displacement / loading): 127 %
   Structure weight / hull surface area: 37 lbs/sq ft or 182 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,80
      - Longitudinal: 6,91
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[Korpen]

Ship interned mainly for patrols in and around the Flyssen islands. The large number of misc weight is intended mainly for cargo or troops, but around 60 mines can also be carried. Inter islands transports are considered an important mission.

Y-Class (Flyssen-class), Netherlands Gunboat laid down 1912
Four ships in class, GY1, GY2, GY3 GY4

Displacement:
   650 t light; 687 t standard; 1 074 t normal; 1 383 t full load

Dimensions: Length overall / water x beam x draught
   185,72 ft / 177,17 ft x 29,53 ft x 11,48 ft (normal load)
   56,61 m / 54,00 m x 9,00 m  x 3,50 m

Armament:
      1 - 4,72" / 120 mm guns in single mounts, 52,91lbs / 24,00kg shells, 1912 Model
     Quick firing gun in deck mount
     on centreline forward, 1 raised gun
      2 - 3,46" / 88,0 mm guns in single mounts, 19,84lbs / 9,00kg shells, 1912 Model
     Quick firing guns in deck mounts
     on centreline, all aft, 1 raised mount
      2 - 1,97" / 50,0 mm guns in single mounts, 3,81lbs / 1,73kg shells, 1912 Model
     Quick firing guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 100 lbs / 45 kg
   Shells per gun, main battery: 250
   1 - 17,7" / 450 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,39" / 10 mm         -               -
   2nd:   0,39" / 10 mm         -               -
   3rd:   0,20" / 5 mm         -               -

   - Conning tower: 2,95" / 75 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 4 000 shp / 2 984 Kw = 18,03 kts
   Range 6 000nm at 15,00 kts
   Bunker at max displacement = 696 tons

Complement:
   93 - 121

Cost:
   £0,056 million / $0,223 million

Distribution of weights at normal displacement:
   Armament: 13 tons, 1,2 %
   Armour: 9 tons, 0,9 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 3 tons, 0,3 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 7 tons, 0,6 %
   Machinery: 159 tons, 14,8 %
   Hull, fittings & equipment: 323 tons, 30,1 %
   Fuel, ammunition & stores: 424 tons, 39,5 %
   Miscellaneous weights: 145 tons, 13,5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2 033 lbs / 922 Kg = 38,6 x 4,7 " / 120 mm shells or 0,9 torpedoes
   Stability (Unstable if below 1.00): 1,21
   Metacentric height 1,1 ft / 0,3 m
   Roll period: 11,6 seconds
   Steadiness   - As gun platform (Average = 50 %): 66 %
         - Recoil effect (Restricted arc if above 1.00): 0,20
   Seaboat quality  (Average = 1.00): 1,68

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0,626
   Length to Beam Ratio: 6,00 : 1
   'Natural speed' for length: 13,31 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 39
   Bow angle (Positive = bow angles forward): 15,00 degrees
   Stern overhang: 3,28 ft / 1,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      19,69 ft / 6,00 m
      - Forecastle (15 %):   16,40 ft / 5,00 m
      - Mid (70 %):      16,40 ft / 5,00 m (8,20 ft / 2,50 m aft of break)
      - Quarterdeck (15 %):   8,20 ft / 2,50 m
      - Stern:      8,20 ft / 2,50 m
      - Average freeboard:   14,14 ft / 4,31 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 73,5 %
      - Above water (accommodation/working, high = better): 106,5 %
   Waterplane Area: 3 919 Square feet or 364 Square metres
   Displacement factor (Displacement / loading): 187 %
   Structure weight / hull surface area: 41 lbs/sq ft or 198 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,80
      - Longitudinal: 8,15
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is adequate
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[Korpen]

Ten boats built. The four of the boats carry one 105mm howitzer instead of the 2nd 77mm gun.

Queens of the river, Netherlands Congo gun boats laid down 1912

Displacement:
   70 t light; 76 t standard; 106 t normal; 130 t full load

Dimensions: Length overall / water x beam x draught
   91,86 ft / 91,86 ft x 16,40 ft x 4,92 ft (normal load)
   28,00 m / 28,00 m x 5,00 m  x 1,50 m

Armament:
      2 - 3,03" / 77,0 mm guns in single mounts, 13,93lbs / 6,32kg shells, 1912 Model
     Quick firing guns in deck mounts
     on centreline, all aft
      4 - 0,31" / 8,0 mm guns in single mounts, 0,02lbs / 0,01kg shells, 1912 Model
     Machine guns in deck mounts
     on side, all amidships
   Weight of broadside 28 lbs / 13 kg
   Shells per gun, main battery: 240

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,98" / 25 mm         -               -
   2nd:   0,59" / 15 mm         -               -

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 431 shp / 321 Kw = 14,00 kts
   Range 2 200nm at 12,00 kts
   Bunker at max displacement = 55 tons (100% coal)

Complement:
   16 - 21

Cost:
   £0,008 million / $0,032 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 3,3 %
   Armour: 3 tons, 3,0 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 3 tons, 3,0 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 0 tons, 0,0 %
   Machinery: 19 tons, 17,8 %
   Hull, fittings & equipment: 34 tons, 32,3 %
   Fuel, ammunition & stores: 36 tons, 34,2 %
   Miscellaneous weights: 10 tons, 9,4 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     147 lbs / 67 Kg = 10,5 x 3,0 " / 77 mm shells or 0,3 torpedoes
   Stability (Unstable if below 1.00): 1,29
   Metacentric height 0,5 ft / 0,2 m
   Roll period: 9,5 seconds
   Steadiness   - As gun platform (Average = 50 %): 53 %
         - Recoil effect (Restricted arc if above 1.00): 0,16
   Seaboat quality  (Average = 1.00): 0,81

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,500
   Length to Beam Ratio: 5,60 : 1
   'Natural speed' for length: 9,58 kts
   Power going to wave formation at top speed: 66 %
   Trim (Max stability = 0, Max steadiness = 100): 65
   Bow angle (Positive = bow angles forward): 0,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      6,56 ft / 2,00 m
      - Forecastle (27 %):   4,92 ft / 1,50 m
      - Mid (50 %):      4,92 ft / 1,50 m
      - Quarterdeck (15 %):   4,92 ft / 1,50 m
      - Stern:      4,92 ft / 1,50 m
      - Average freeboard:   5,10 ft / 1,55 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 95,2 %
      - Above water (accommodation/working, high = better): 58,8 %
   Waterplane Area: 1 004 Square feet or 93 Square metres
   Displacement factor (Displacement / loading): 134 %
   Structure weight / hull surface area: 22 lbs/sq ft or 108 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,88
      - Longitudinal: 3,11
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is cramped
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather