WesWorld

Sohunden Class Torpedo Boat laid down 1917

All scrapped 1939

Vessels-
K.D.M. Sohunden
K.D.M. Havhesten
K.D.M. Makrelen
K.D.M. Narvhalen
K.D.M. Nordkaperen
K.D.M. Soloven
K.D.M. Springeren - Sunk due to enemy action
K.D.M. Storen
K.D.M. Havornen
K.D.M. Sobjornen


Displacement:
1,254 t light; 1,290 t standard; 1,489 t normal; 1,643 t full load
Loading submergence 140 tons/feet

Dimensions:
270.00 ft x 27.00 ft x 13.00 ft (normal load)
82.30 m x 8.23 m x 3.96 m

Armament:
4 - 3.00" / 76 mm guns
4 - 2.00" / 51 mm AA guns
4 - 0.50" / 13 mm guns
Weight of broadside 70 lbs / 32 kg
8 - 18.0" / 457.2 mm above water torpedoes

Armour:
Main gun shields 1.00" / 25 mm, AA gun shields 0.50" / 13 mm, Light gun shields 0.25" / 6 mm
Conning tower 1.00" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 40,441 shp / 30,169 Kw = 32.00 kts
Range 6,500nm at 12.00 kts

Complement:
119 - 155

Cost:
£0.320 million / $1.281 million

Distribution of weights at normal displacement:
Armament: 9 tons, 0.6 %
Armour: 8 tons, 0.5 %
Belts: 0 tons, 0.0 %, Armament: 5 tons, 0.3 %, Armour Deck: 0 tons, 0.0 %
Conning Tower: 3 tons, 0.2 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 892 tons, 59.9 %
Hull, fittings & equipment: 320 tons, 21.5 %
Fuel, ammunition & stores: 235 tons, 15.8 %
Miscellaneous weights: 25 tons, 1.7 %

Metacentric height 0.9

Remarks:
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.17
Shellfire needed to sink: 291 lbs / 132 Kg = 21.6 x 3.0 " / 76 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 78 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.19
Relative quality as seaboat: 1.21

Hull form characteristics:
Block coefficient: 0.550
Sharpness coefficient: 0.35
Hull speed coefficient 'M': 7.23
'Natural speed' for length: 16.43 kts
Power going to wave formation at top speed: 76 %
Trim: 64
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 199.6 %
Relative accommodation and working space: 62.5 %
(Average = 100%)
Displacement factor: 49 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.46
(Structure weight / hull surface area: 29 lbs / square foot or 142 Kg / square metre)
Relative longitudinal hull strength: 2.32
(for 18.00 ft / 5.49 m average freeboard, freeboard adjustment 7.65 ft)
Relative composite hull strength: 0.54


Torpedoes are mounted in 2 X 4 tube turrets placed tandem amidships

Delfinen Class Torpedo Boat laid down 1913

All scrapped 1939

Vessels-
K.D.M. Delfinen
K.D.M. Hvolrossen
K.D.M. Svaerdfisken
K.D.M. Sorldderen
K.D.M. Soulven
K.D.M. Flyvefisken


Displacement:
769 t light; 791 t standard; 899 t normal; 982 t full load
Loading submergence 85 tons/feet

Dimensions:
180.00 ft x 25.00 ft x 13.00 ft (normal load)
54.86 m x 7.62 m x 3.96 m

Armament:
3 - 3.00" / 76 mm QF guns2 - 0.50" / 13 mm guns
Weight of broadside 41 lbs / 18 kg
4 - 18.0" / 457.2 mm above water torpedoes

Armour:
QF gun shields 0.50" / 13 mm
Conning tower 0.50" / 13 mm

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 26,869 shp / 20,045 Kw = 29.00 kts
Range 2,500nm at 14.00 kts

Complement:
82 - 106

Cost:
£0.112 million / $0.448 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.6 %
Armour: 4 tons, 0.4 %
Belts: 0 tons, 0.0 %, Armament: 3 tons, 0.3 %, Armour Deck: 0 tons, 0.0 %
Conning Tower: 1 tons, 0.1 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 510 tons, 56.7 %
Hull, fittings & equipment: 225 tons, 25.1 %
Fuel, ammunition & stores: 130 tons, 14.4 %
Miscellaneous weights: 25 tons, 2.8 %

Metacentric height 0.6

Remarks:
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.01
Shellfire needed to sink: 220 lbs / 100 Kg = 2.0 x 6 " / 152 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.18
Relative quality as seaboat: 1.00

Hull form characteristics:
Block coefficient: 0.538
Sharpness coefficient: 0.38
Hull speed coefficient 'M': 5.70
'Natural speed' for length: 13.42 kts
Power going to wave formation at top speed: 82 %
Trim: 70
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 190.4 %
Relative accommodation and working space: 70.6 %
(Average = 100%)
Displacement factor: 41 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.50
(Structure weight / hull surface area: 31 lbs / square foot or 153 Kg / square metre)
Relative longitudinal hull strength: 6.35
(for 18.60 ft / 5.67 m average freeboard, freeboard adjustment 9.25 ft)
Relative composite hull strength: 0.64

Tumieren Class Torpedo Boat laid down 1911

All scrapped 1939

Vessels-
K.D.M. Tumieren
K.D.M. Vindhunden
K.D.M. Spoekhuggeren
K.D.M. Ormen


Displacement:
669 t light; 687 t standard; 800 t normal; 888 t full load
Loading submergence 93 tons/feet

Dimensions:
185.00 ft x 24.00 ft x 10.00 ft (normal load)
56.39 m x 7.32 m x 3.05 m

Armament:
2 - 3.00" / 76 mm QF guns2 - 0.50" / 13 mm guns
Weight of broadside 27 lbs / 12 kg
5 - 18.0" / 457.2 mm above water torpedoes

Armour:
QF gun shields 0.50" / 13 mm
Conning tower 0.50" / 13 mm

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 18,361 shp / 13,698 Kw = 27.00 kts
Range 2,500nm at 14.00 kts

Complement:
75 - 97

Cost:
£0.086 million / $0.345 million

Distribution of weights at normal displacement:
Armament: 3 tons, 0.4 %
Armour: 3 tons, 0.3 %
Belts: 0 tons, 0.0 %, Armament: 2 tons, 0.2 %, Armour Deck: 0 tons, 0.0 %
Conning Tower: 1 tons, 0.1 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 429 tons, 53.6 %
Hull, fittings & equipment: 209 tons, 26.1 %
Fuel, ammunition & stores: 132 tons, 16.5 %
Miscellaneous weights: 25 tons, 3.1 %

Metacentric height 0.6

Remarks:
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.05
Shellfire needed to sink: 262 lbs / 119 Kg = 2.4 x 6 " / 152 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.13
Relative quality as seaboat: 1.06

Hull form characteristics:
Block coefficient: 0.631
Sharpness coefficient: 0.41
Hull speed coefficient 'M': 6.09
'Natural speed' for length: 13.60 kts
Power going to wave formation at top speed: 80 %
Trim: 66
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 179.6 %
Relative accommodation and working space: 60.5 %
(Average = 100%)
Displacement factor: 52 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.56
(Structure weight / hull surface area: 30 lbs / square foot or 147 Kg / square metre)
Relative longitudinal hull strength: 4.61
(for 17.00 ft / 5.18 m average freeboard, freeboard adjustment 7.86 ft)
Relative composite hull strength: 0.69