Torpedoboten

[Korpen]

KTB-1, Netherlands Costal TB laid down 1912

KTB-11, 12, 13, 14, 15, 16, 17, 18 & KTB-19 laid down 1/13
KTB-110, 111, 112, 113, 114, 115, 116, 117& KTB-118 laid down 2/13
KTB-119, 120, 121, 122, 123 & KTB-124 laid down 1/14
KTB-125, 126, 127 & KTB-128 laid down 2/14

28 ships in class

Displacement:
   100 t light; 103 t standard; 117 t normal; 129 t full load

Dimensions: Length overall / water x beam x draught
   147,64 ft / 147,64 ft x 12,58 ft x 5,52 ft (normal load)
   45,00 m / 45,00 m x 3,83 m  x 1,68 m

Armament:
      1 - 2,76" / 70,0 mm guns in single mounts, 10,47lbs / 4,75kg shells, 1912 Model
     Quick firing gun in deck mount
     on centreline aft
      3 - 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 11 lbs / 5 kg
   Shells per gun, main battery: 115
   2 - 17,7" / 450 mm above water torpedoes

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 3 500 shp / 2 611 Kw = 25,07 kts
   Range 1 700nm at 12,00 kts, Range 200nm at 25,07 kts
   Bunker at max displacement = 26 tons

Complement:
   17 - 23

Cost:
   £0,013 million / $0,053 million

Distribution of weights at normal displacement:
   Armament: 1 tons, 1,1 %
   Machinery: 63 tons, 53,4 %
   Hull, fittings & equipment: 34 tons, 28,7 %
   Fuel, ammunition & stores: 18 tons, 15,1 %
   Miscellaneous weights: 2 tons, 1,7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     25 lbs / 11 Kg = 2,4 x 2,8 " / 70 mm shells or 0,1 torpedoes
   Stability (Unstable if below 1.00): 1,08
   Metacentric height 0,3 ft / 0,1 m
   Roll period: 10,4 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0,15
   Seaboat quality  (Average = 1.00): 0,75

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0,400
   Length to Beam Ratio: 11,74 : 1
   'Natural speed' for length: 12,15 kts
   Power going to wave formation at top speed: 70 %
   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:      9,84 ft / 3,00 m
      - Forecastle (27 %):   9,19 ft / 2,80 m (4,92 ft / 1,50 m aft of break)
      - 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:   6,14 ft / 1,87 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 182,6 %
      - Above water (accommodation/working, high = better): 29,7 %
   Waterplane Area: 1 143 Square feet or 106 Square metres
   Displacement factor (Displacement / loading): 40 %
   Structure weight / hull surface area: 13 lbs/sq ft or 62 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 2,32
      - Overall: 0,58
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[Korpen]

KTB-2, Netherlands Torpedoboot laid down 1912

KTB-21, 22, 23, 24, 25 & KTB-26 laid down 1/1913
KTB-27, 28, 29, 210, 211 & KTB-212 laid down 2/1913
KTB-213, 214, 215, 216, 217& KTB-218 laid down 1/1914
KTB-219,220 & KTB-221 laid down 2/1914

21 ships in class


Displacement:
   250 t light; 258 t standard; 298 t normal; 330 t full load

Dimensions: Length overall / water x beam x draught
   216,60 ft / 209,97 ft x 17,72 ft x 6,56 ft (normal load)
   66,02 m / 64,00 m x 5,40 m  x 2,00 m

Armament:
      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 ends, evenly spread
   Weight of broadside 40 lbs / 18 kg
   Shells per gun, main battery: 115
   2 - 17,7" / 450 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,20" / 5 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 8 500 shp / 6 341 Kw = 28,08 kts
   Range 2 750nm at 12,00 kts, Range 252nm at 28,08 kts
   Bunker at max displacement = 72 tons

Complement:
   35 - 46

Cost:
   £0,035 million / $0,139 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 1,7 %
   Armour: 1 tons, 0,2 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 1 tons, 0,2 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 0 tons, 0,0 %
   Machinery: 155 tons, 52,1 %
   Hull, fittings & equipment: 86 tons, 28,7 %
   Fuel, ammunition & stores: 48 tons, 16,2 %
   Miscellaneous weights: 3 tons, 0,9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     78 lbs / 35 Kg = 3,7 x 3,5 " / 88 mm shells or 0,1 torpedoes
   Stability (Unstable if below 1.00): 1,38
   Metacentric height 0,7 ft / 0,2 m
   Roll period: 9,2 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0,18
   Seaboat quality  (Average = 1.00): 0,83

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0,427
   Length to Beam Ratio: 11,85 : 1
   'Natural speed' for length: 14,49 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 61
   Bow angle (Positive = bow angles forward): 30,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      11,48 ft / 3,50 m
      - Forecastle (20 %):   11,48 ft / 3,50 m (10,50 ft / 3,20 m aft of break)
      - Mid (30 %):      7,22 ft / 2,20 m
      - Quarterdeck (15 %):   6,89 ft / 2,10 m
      - Stern:      6,89 ft / 2,10 m
      - Average freeboard:   8,10 ft / 2,47 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 182,3 %
      - Above water (accommodation/working, high = better): 68,5 %
   Waterplane Area: 2 331 Square feet or 217 Square metres
   Displacement factor (Displacement / loading): 41 %
   Structure weight / hull surface area: 18 lbs/sq ft or 86 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 1,73
      - Overall: 0,56
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[Korpen]

KTB-3, Netherlands Torpedoboot laid down 1912

KTB-31, 32, 33, 34 35, 36, 37, 38, 39 and KTB 310 laid down 2/1914
KTB-311, 312, 313, 314 315, 316, 317, 318, 319 and KTB 320 laid down 1/1915*
*Fitted with geared turbines


Displacement:
   200 t light; 207 t standard; 238 t normal; 262 t full load

Dimensions: Length overall / water x beam x draught
   204,30 ft / 196,85 ft x 16,40 ft x 6,56 ft (normal load)
   62,27 m / 60,00 m x 5,00 m  x 2,00 m

Armament:
      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 ends, evenly spread
      2 - 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 40 lbs / 18 kg
   Shells per gun, main battery: 100
   3 - 17,7" / 450 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,20" / 5 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 7 151 shp / 5 334 Kw = 27,80 kts
   Range 2 400nm at 12,00 kts
   Bunker at max displacement = 55 tons

Complement:
   29 - 39

Cost:
   £0,029 million / $0,115 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 2,2 %
   Armour: 1 tons, 0,3 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 1 tons, 0,3 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 0 tons, 0,0 %
   Machinery: 124 tons, 51,9 %
   Hull, fittings & equipment: 68 tons, 28,7 %
   Fuel, ammunition & stores: 38 tons, 15,8 %
   Miscellaneous weights: 3 tons, 1,1 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     52 lbs / 24 Kg = 2,5 x 3,5 " / 88 mm shells or 0,1 torpedoes
   Stability (Unstable if below 1.00): 1,16
   Metacentric height 0,4 ft / 0,1 m
   Roll period: 10,4 seconds
   Steadiness   - As gun platform (Average = 50 %): 56 %
         - Recoil effect (Restricted arc if above 1.00): 0,26
   Seaboat quality  (Average = 1.00): 0,76

Hull form characteristics:
   Hull has raised forecastle, rise forward of midbreak
   Block coefficient: 0,393
   Length to Beam Ratio: 12,00 : 1
   'Natural speed' for length: 14,03 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 73
   Bow angle (Positive = bow angles forward): 30,00 degrees
   Stern overhang: 0,82 ft / 0,25 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      11,48 ft / 3,50 m
      - Forecastle (18 %):   10,66 ft / 3,25 m (6,56 ft / 2,00 m aft of break)
      - Mid (30 %):      6,56 ft / 2,00 m (6,23 ft / 1,90 m aft of break)
      - Quarterdeck (15 %):   6,23 ft / 1,90 m
      - Stern:      7,38 ft / 2,25 m
      - Average freeboard:   7,22 ft / 2,20 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 184,9 %
      - Above water (accommodation/working, high = better): 44,6 %
   Waterplane Area: 1 980 Square feet or 184 Square metres
   Displacement factor (Displacement / loading): 39 %
   Structure weight / hull surface area: 17 lbs/sq ft or 81 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 1,63
      - Overall: 0,56
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[Korpen]

KTB-4, Netherlands Torpedoboot laid down 1916

KTB-41, 42, 43, 44, 45, 46, 47, 48, 49 & 410 Laid down 1915/2

Displacement:
   200 t light; 206 t standard; 232 t normal; 253 t full load

Dimensions: Length overall / water x beam x draught
   204,49 ft / 196,85 ft x 16,40 ft x 6,59 ft (normal load)
   62,33 m / 60,00 m x 5,00 m  x 2,01 m

Armament:
      1 - 1,97" / 50,0 mm guns in single mounts, 3,81lbs / 1,73kg shells, 1916 Model
     Quick firing gun in deck mount
     on centreline aft
      1 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1916 Model
     Quick firing gun in deck mount
     on centreline forward
      1 - 0,59" / 15,0 mm guns in single mounts, 0,10lbs / 0,05kg shells, 1916 Model
     Machine gun in deck mount
     on centreline amidships
   Weight of broadside 25 lbs / 11 kg
   Shells per gun, main battery: 99
   4 - 17,7" / 450 mm above water torpedoes

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 7 911 shp / 5 902 Kw = 28,62 kts
   Range 2 400nm at 12,00 kts
   Bunker at max displacement = 46 tons

Complement:
   29 - 38

Cost:
   £0,044 million / $0,177 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 1,3 %
   Armour: 0 tons, 0,2 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 0 tons, 0,2 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 0 tons, 0,0 %
   Machinery: 124 tons, 53,6 %
   Hull, fittings & equipment: 69 tons, 29,5 %
   Fuel, ammunition & stores: 32 tons, 13,8 %
   Miscellaneous weights: 4 tons, 1,5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     50 lbs / 23 Kg = 13,0 x 2,0 " / 50 mm shells or 0,1 torpedoes
   Stability (Unstable if below 1.00): 1,07
   Metacentric height 0,4 ft / 0,1 m
   Roll period: 11,2 seconds
   Steadiness   - As gun platform (Average = 50 %): 52 %
         - Recoil effect (Restricted arc if above 1.00): 0,17
   Seaboat quality  (Average = 1.00): 0,71

Hull form characteristics:
   Hull has raised forecastle, rise forward of midbreak
   Block coefficient: 0,381
   Length to Beam Ratio: 12,00 : 1
   'Natural speed' for length: 14,03 kts
   Power going to wave formation at top speed: 69 %
   Trim (Max stability = 0, Max steadiness = 100): 73
   Bow angle (Positive = bow angles forward): 30,00 degrees
   Stern overhang: 0,82 ft / 0,25 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      11,81 ft / 3,60 m
      - Forecastle (18 %):   10,50 ft / 3,20 m (6,56 ft / 2,00 m aft of break)
      - Mid (30 %):      6,56 ft / 2,00 m (6,23 ft / 1,90 m aft of break)
      - Quarterdeck (15 %):   6,23 ft / 1,90 m
      - Stern:      7,38 ft / 2,25 m
      - Average freeboard:   7,22 ft / 2,20 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 184,8 %
      - Above water (accommodation/working, high = better): 32,0 %
   Waterplane Area: 1 970 Square feet or 183 Square metres
   Displacement factor (Displacement / loading): 38 %
   Structure weight / hull surface area: 17 lbs/sq ft or 82 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 1,65
      - Overall: 0,56
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[damocles]

FTB V class , Holland FPB-A laid down 1919

Displacement:
   199 t light; 204 t standard; 228 t normal; 247 t full load

Dimensions: Length overall / water x beam x draught
   203.87 ft / 198.00 ft x 18.00 ft x 5.60 ft (normal load)
   62.14 m / 60.35 m x 5.49 m  x 1.71 m

Armament:
     1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1920 Model
     Quick firing gun in deck mount
     on centreline aft
     4 - 0.59" / 15.0 mm guns (1x4 guns), 0.10lbs / 0.05kg shells, 1920 Model
     Machine guns in deck mount
     on centreline aft
   Weight of broadside 13 lbs / 6 kg
   Shells per gun, main battery: 150
   3 - 21.0" / 530 mm submerged torpedo tubes

Armour:
  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.39" / 10 mm   0.39" / 10 mm            -

Machinery:
   Diesel Internal combustion generators,
   Electric motors, 2 shafts, 4,491 shp / 3,350 Kw = 25.00 kts
   Range 2,600nm at 12.00 kts
   Bunker at max displacement = 43 tons

Complement:
   29 - 38

Cost:
   £0.056 million / $0.225 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.7 %
   Armour: 1 tons, 0.4 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 1 tons, 0.4 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 110 tons, 48.4 %
   Hull, fittings & equipment: 74 tons, 32.3 %
   Fuel, ammunition & stores: 30 tons, 12.9 %
   Miscellaneous weights: 12 tons, 5.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     26 lbs / 12 Kg = 2.0 x 3.0 " / 75 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.07
   Metacentric height 0.4 ft / 0.1 m
   Roll period: 11.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 94 %
         - Recoil effect (Restricted arc if above 1.00): 0.10
   Seaboat quality  (Average = 1.00): 1.16

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0.400
   Length to Beam Ratio: 11.00 : 1
   'Natural speed' for length: 14.07 kts
   Power going to wave formation at top speed: 64 %
   Trim (Max stability = 0, Max steadiness = 100): 81
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      16.14 ft / 4.92 m
      - Forecastle (20 %):   14.50 ft / 4.42 m (6.59 ft / 2.01 m aft of break)
      - Mid (50 %):      6.59 ft / 2.01 m
      - Quarterdeck (15 %):   6.59 ft / 2.01 m
      - Stern:      6.59 ft / 2.01 m
      - Average freeboard:   8.30 ft / 2.53 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 281.7 %
      - Above water (accommodation/working, high = better): 95.0 %
   Waterplane Area: 2,194 Square feet or 204 Square metres
   Displacement factor (Displacement / loading): 67 %
   Structure weight / hull surface area: 16 lbs/sq ft or 80 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.54
      - Longitudinal: 1.99
      - Overall: 0.62
   Hull space for machinery, storage, compartmentation is extremely poor
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform

12 tons misc.
3 TT (1 reload).
trial  speed=30 knots
Experimental patrol boat designed to incorporate, torpedo tubes with reloads in the hull.

Notes 12 tons ,misc.
4 tons nightfighting gear all versions

Subchaser/mine warfare  version lands torpedoes and replaces these weapons with
2 tons hydrophones.
6 tons depth charges or mines carried..
When sweeping mines, 6 tons of sweep gear carried.

First Illustration is the export model.
Second is the Dutch Standard.